Abstract

A steer by wire system (1) for steering a vehicle with a steering mechanics (8), the steer by wire system (1) having a steering input device (2) and a first actuating arrangement (5), wherein the first actuating arrangement (5) includes a first electric motor (5a), which is in connection to the steering input device (2), and a first hydraulic unit (5d), which is operatively coupled to the first electric motor (5a), wherein the first hydraulic unit (5) is configured to be fluidly connected to the steering mechanics (8). The objective of the present disclosure is to provide a steer by wire system (1) having a large range of steering forces. This objective is solved by a steer by wire system (1) including a second actuating arrangement (6) being structured and coupled analogously to the first actuating arrangement (5).

IPC Classes  ?

• B62D 5/00 - Power-assisted or power-driven steering

Abstract

Hydraulic axial piston unit includes a rotatable cylinder block and a valve segment with two pressure ports. An IDC control port and an ODC control port are located on the valve segment in circumferential direction between the circumferential ends of the pressure ports such that a cylinder bore can be fluidly connected to the IDC control port or the ODC control port when the associated working piston is at or close to its inner dead center or outer dead center. The circumferential distance from the control ports to the pressure ports is smaller than the circumferential extension of the cylinder bores. A first and a second bypass line each connecting one of the control ports are provided with an adjustable orifice in the first bypass line, capable of continuously variably opening and closing the first bypass line in order to enable an adjustable fluid flow connection between the connected pressure port and the connected pressure port.

IPC Classes  ?

• F04B 1/324 - Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
• F04B 1/2021 - Details or component parts characterised by the contact area between cylinder barrel and valve plate
• F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups

Abstract

A fluid rotary machine (100, 200) includes a first movement chain with a motor (101, 201) including a motor shaft (102, 202) rotationally coupled to a valve element (103, 203), for example a disc valve element (103) or a spool valve element (203), and a motor control unit configured to control rotational movement of the motor shaft (102, 202). The valve element (103, 203) is configured to control a fluid flow to a gear wheel (114, 214) of a second movement chain. The second movement chain includes the gear wheel (114, 214), a cardan shaft (116, 216) and an output shaft (117, 217), wherein the cardan shaft (116, 216) is rotationally coupled to the gear wheel (114, 214) and the output shaft (117, 217). In order to provide an improved fluid rotary machine, which especially allows more flexible and accurate control of rotational movements of components (114, 214, 116, 216, 117, 217) of the second movement chain are rotatable relative to the motor shaft (102, 202). Further, an encoder module (110, 210) includes a sensor arrangement configured to detect rotational movement of a component of the second movement chain, for example, of the cardan shaft (116, 216) and/or the output shaft (117, 217) is provided.

IPC Classes  ?

• F04C 14/28 - Safety arrangementsMonitoring
• F04C 2/08 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

Goods & Services

Machines and machine tools namely for construction machines, Agricultural machines, Materials handling machines, Forestry machines, Road building machines, Presses for industrial use [machines]; motors and engines (except for land vehicles) namely for construction machines, Agricultural machines, Materials handling machines, Forestry machines, Road building machines, Presses for industrial use [machines]; machine coupling and transmission components (except for land vehicles); Pumps [parts of machines, engines or motors].

Abstract

An automatic tool tilt command system for a boom moveably connected with one end to a chassis of a working machine, wherein a tiltable tool is attachable to the other end. A first electronic control valve for controlling a fluid flow to and from a lift cylinder for moving the boom and a second electronic control valve for controlling a fluid flow to and from a tilt cylinder for tilting the tool. A control unit receives signals to move the boom and transmits signals to the first electronic control valve in order to move the boom. In parallel the control unit transmits signals to the second electronic control valve which are based on a predetermined fluid flow ratio defined by the fluid flow for the boom movement and the fluid flow for tool levelling, so that the tool maintains its inclination angle with respect to the horizontal.

IPC Classes  ?

• B66F 9/22 - Hydraulic devices or systems
• B66F 9/16 - PlatformsForksOther load-supporting or load-gripping members inclinable relative to mast
• E02F 9/20 - DrivesControl devices

Abstract

A hydraulic arrangement (1) including a supply port (P), a return port (T), a working port arrangement (L, R), and a valve (2) controlling a supply of hydraulic fluid from the supply port (P) to the working port arrangement (L, R), wherein the valve (2) includes a housing (4) and a spool (3) movable in lengthwise direction in the housing (4) and forming together with the housing (4) at least one flow path the resistance of which depends on the position of the spool (3) in the housing (4), and the spool (3) is actuated by a hydraulic pilot pressure (21, 22) in a pressure chamber (7, 8). In such a hydraulic arrangement a safety functionality should be achieved in a simple way. To this end the housing (4) includes a pilot pressure relief port (20) connected to the return port (T) via a shut-off valve (10) and the spool (3) after a predetermined stroke (13, 14) opens a connection between the pressure chamber (7, 8) and the pilot pressure relief port (20).

IPC Classes  ?

• F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
• F15B 13/042 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
• F15B 20/00 - Safety arrangements for fluid actuator systemsApplications of safety devices in fluid actuator systemsEmergency measures for fluid actuator systems
• F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors

Abstract

A hydraulic arrangement including a supply port (5), a working port arrangement (20), a valve arrangement (3, 8, 21) controlling a supply of hydraulic fluid from the supply port (5) to the working port arrangement (20), a command device (20) controlling the valve arrangement (3, 8, 21), and a sensor arrangement (19) sensing at least a working condition of the hydraulic arrangement is described. In such a hydraulic arrangement a simple way should be given to achieve a safety functionality. To this end the valve arrangement (3, 8, 21) includes flow limiting means (9) operatively coupled to the sensor arrangement (19), wherein the flow limiting means (9) limit the flow to the working port arrangement (20) depending on the at least one working condition of the hydraulic arrangement.

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 5/07 - Supply of pressurised fluid for steering also supplying other consumers
• B62D 5/08 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of valve used

Abstract

A hydraulic steering system (1) including a supply port arrangement having a supply port (P) and a return port (T), a working port arrangement having two working ports (L, R), and a measuring motor (4). The steering behavior of such a steering system should be improved. To this end for each steering direction the measuring motor (4) is arranged in flow direction between the working port (L, R) and the return port (T).

IPC Classes  ?

• B62D 5/08 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of valve used
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves

Abstract

A system for transmitting control area network signals includes a first mechanical system, and a first component for determining conditions of the first mechanical system. The first component is provided with at least an ultra-wideband transmitter. A second component has at least an ultra-wideband receiver. The first component is operable to transmit at least one of a control signal and a diagnostic signal from the first mechanical system to the second component as a controller area network signal. A method is also disclosed.

IPC Classes  ?

• H04L 12/40 - Bus networks

Abstract

A hydraulic steering arrangement (1) including a supply port arrangement having a supply port (2) and a return port (3), a working port arrangement having two working ports (4, 5), a supply flow path (7) between the supply port (2) and one of the working ports (4, 5), a return flow path (9) between the other of the working ports (5, 4) and the return port (3) and a valve arrangement having a spool/sleeve set, wherein the supply flow path (7) includes a supply orifice (A4) and the return flow path (9) comprises a return orifice (A5). Such a hydraulic steering arrangement should give a comfortable feeling when used in connection with an articulated vehicle. To this end a variable damping orifice (Adp) is arranged downstream the supply orifice (A4) and upstream the return orifice (A5).

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/087 - Sliding spool valves

Goods & Services

Metal fittings, connectors, and couplers for fluid conveyance products, namely, for hoses and pipes Non-metal hoses for fluid conveyance, namely, hydraulic hoses of plastic, hydraulic hoses of rubber

Abstract

A method includes the steps of providing a plurality of ultrawide band ("UWB") components that may be transmitters and/or receivers (22, 44, 52, 53) at a first location on a machine part (20, 40, 42, 51), and providing at least one UWB component that may be a transmitter and/or receiver at a second location, with at least one of the UWB components communicating with a control on one of the first and second locations. Radial frequency signals are sent from at least one of the UWB components at one of the first and second locations to a second UWB component on the other of the first and second locations, and receiving a reflective signal at the at least one UWB component, and determining a relative position of the first and second locations in at least two dimensions.

IPC Classes  ?

• G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
• G01S 13/02 - Systems using reflection of radio waves, e.g. primary radar systemsAnalogous systems
• A01B 69/00 - Steering of agricultural machines or implementsGuiding agricultural machines or implements on a desired track

Abstract

A hydraulic circuit arrangement includes a plurality of electronically-commutated pumps providing flow to a common hydraulic line, the plurality of electronically-commutated pumps including one or more quantized electronically-commutated pumps and one or more unquantized electronically-commutated pumps. A controller includes a pressure controller and a flow divider. The pressure controller is configured to receive a pressure signal corresponding to the pressure within the common hydraulic line, to compare the pressure signal to a demanded pressure, and to determine a target flow value required to produce the demanded pressure. The flow divider is configured to receive the target flow value and allocate the target flow value into a quantized target flow value for allocation among the one or more quantized electronically-commutated pumps and an unquantized target flow value for allocation among the one or more unquantized electronically-commutated pumps.

IPC Classes  ?

• F04B 49/06 - Control using electricity
• F04B 1/06 - Control
• F04B 11/00 - Equalisation of pulses, e.g. by use of air vesselsCounteracting cavitation
• F04B 23/06 - Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type

Goods & Services

Metal fittings, connectors, and couplers for fluid conveyance products. Hoses for fluid conveyance.

Abstract

A hydraulic steering system (1) includes a steering command device (2) having a steering sensor (3), a steering motor (6), a wheel sensor (9), a pressure source (P), and control means (12) controlling a fluid supply from the pressure source (P) to the steering motor (6), wherein the control means (12) has an open loop control (19). Such a steering system should have a good relationship between steering input from the operator and steering behaviour of the vehicle to be steered. To this end the control means (12) include in addition to the open loop control (19) a closed loop control (20), wherein cross-over transition means (21) are provided which are connected to the open loop control (19) and to the closed loop control (20) and control a transition between the open loop control (19) and the closed loop control (20).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 5/32 - Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means for telemotor systems

Abstract

A steering system (1) is described comprising including a supply port arrangement having a supply port (P) and a return port (T), a steering command arrangement having a steering sensor (5), a controller (9) connected to the steering sensor (5), an electro-hydraulic steering valve (8) con-trolled by the controller (9), and a working port arrangement having two working ports (L, R), wherein the working port arrangement is connected to the supply port arrangement by means of the steering valve (8). Such a steering system should have a good comfort. To this end the steering command arrangement includes a steering wheel (4) connected to a hydraulic pumping unit (7), wherein the pumping unit (7) is part of a hydraulic circuit (11) having means for creating a flow resistance.

IPC Classes  ?

• B62D 5/30 - Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist

Abstract

A hydraulic steering arrangement (1) is disclosed. The hydraulic steering arrangement (1) includes a supply port arrangement (P, T) having a pressure port (P) and a tank port (T), a working port arrangement having two working ports (L, R), a main flow path (2) having a main orifice (A1) and at least one further orifice (A2, A3, A4) downstream the main orifice (A1), the main flow path (2) being arranged between the pressure port (P) and the working port arrangement (L, R), a return flow path (4) arranged between the working port arrangement (L, R) and the tank port (T), a measuring motor (3), an amplification flow path (6) having an amplification orifice (AU) and being arranged between the pressure port (P) and the working port arrangement (L, R), and an adjustable pressure source (9) connected to the pressure port (P) and having a load sensing port (18), wherein a main drain orifice (Adrain) is connected between the main flow path (2) down-stream the main orifice (A1) and the return flow path (4). Such a steering arrangement should have the possibility of dynamic steering with a simple construction. To this end a dynamic main orifice (A1-dyn) is connected between the load sensing port (18) and the main flow path (2) downstream the main orifice (A1), and a dynamic drain orifice (Adrain-dyn) is connected between the load sensing port (18) and the return flow path (4), which dynamic drain orifice (Adrain-dyn) is open when the dynamic main orifice (A1-dyn) is closed.

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/07 - Supply of pressurised fluid for steering also supplying other consumers
• B62D 5/087 - Sliding spool valves

Abstract

The fan system includes a fan operated by a hydraulic motor which is driven by a hydraulic variable displacement pump that includes a displacement volume adjusting element. A tilt angle of the displacement volume adjusting element can be adjusted by controlling a tilt current supplied to an electronic displacement control unit. The hydraulic fan system further includes means for determining the volumetric flow rate of the pump and a control unit having: a signal connection to the means for determining the volumetric flow rate of the pump, a signal connection to a fan speed setting device, and a fan speed calculating unit for calculating a fan speed from the determined volumetric flow rate, a fan speed error determining unit for determining a fan speed error by comparing the calculated fan speed to the fan speed set by the fan speed setting device. The control unit can supply an adapted tilt current to the electronic displacement control unit in order to adjust the tilt angle of the displacement volume adjusting device, such that the volumetric flow rate can be adapted in order to reduce the fan speed error, wherein an ideal tilt current value is derived from the calculated fan speed and safety actions are performed in order to prevent damage to the fan, if the difference between the ideal tilt current value and the adapted tilt current is higher than a tilt current threshold value.

IPC Classes  ?

• F04D 27/00 - Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
• F04D 25/04 - Units comprising pumps and their driving means the pump being fluid-driven

Abstract

Hydraulic axial piston unit comprising a rotatable cylinder block and a valve segment with two pressure ports. An IDC control port and an ODC control port are located on the valve segment in circumferential direction between the circumferential ends of the pressure ports such that a cylinder bore can be fluidly connected to the IDC control port or the ODC control port when the associated working piston is at or close to its inner dead center or outer dead center. The circumferential distance from the control ports to the pressure ports is smaller than the circumferential extension of the cylinder bores. A first and a second bypass line each connecting one of the control ports are provided with an adjustable orifice in the first bypass line, capable of continuously variably opening and closing the first bypass line in order to enable an adjustable fluid flow connection between the connected pressure port and the connected pressure port.

IPC Classes  ?

• F04B 1/2021 - Details or component parts characterised by the contact area between cylinder barrel and valve plate
• F04B 1/30 - Control of machines or pumps with rotary cylinder blocks
• F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups

Abstract

A hydraulic steering unit (2) includes a steering unit (2) including a supply port arrangement having a supply port (P) and a return port (T), a working port arrangement having two working ports (LR), a steering valve arrangement having two valve elements (32, 33) arranged in a housing (30, 38, 39) and being moveable in relation to each other to change characteristics of orifices, and a measuring motor (9) arranged in a line between the steering valve arrangement and one of the working ports (LR). A hydraulic steering unit should create similar end stop sealings in both steering directions. To this end, backpressure means are provided generating a backpressure on the measuring motor (9), wherein the backpressure means are controlled by the valve element (32, 33), and friction means (43, 43′) are provided between one of the valve elements (33) and the housing (30, 38, 39) or a rotating part of the measuring motor (9) and the housing (30, 38, 39), respectively.

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

The invention relates to pseudo-stationary angular position encoding device (1, 12, 20) that comprises at least a light source (2), a first polarisation device (4), a second polarisation device (5), and a light intensity detecting device (3). First and second polarisation device (4, 5) are arranged rotatably relative to each other. The pseudo-stationary angular position encoding device (1, 12, 20) is arranged in a way that light emanating from the light source (2) passes through the first and second polarisation device (4, 5) and illuminates the light intensity detecting device (3).

IPC Classes  ?

• G01D 5/34 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells

Abstract

A hydraulic control system for linear actuation that includes an electric motor connected to a hydraulic pump and a hydraulic cylinder connected to the pump by a first flow line. A pressure transducer, a pressure control valve, and a check valve are connected to the first flow line between the pump and the cylinder and a tank is connected to the pump by a second flow line and the cylinder by a return line. A control valve is connected between the first flow line and the return line.

IPC Classes  ?

• B66F 7/06 - Lifting frames, e.g. for lifting vehiclesPlatform lifts with platforms supported by levers for vertical movement
• B66F 7/08 - Lifting frames, e.g. for lifting vehiclesPlatform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
• F04B 17/03 - Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
• F04B 23/02 - Pumping installations or systems having reservoirs
• F04B 49/22 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by means of valves
• F15B 11/05 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
• F15B 15/18 - Combined units comprising both motor and pump

Abstract

A hydraulic steering system (1) is described. The hydraulic steering system (1) comprises a steering motor (2) and a joystick (3) having a housing (4), a handle (5) mounted movably to the housing (4), a handle angle sensor (6) and return to center means (7) producing a restoring force on the handle (5), wherein the return to center means (7) produces a variable restoring force depending on an angle of the handle (5) and/or on a signal at an input (8) of the return to center means (7) for a parameter of a vehicle to be steered and the joystick (3) can be operated in a first mode, in which the operator operates the joystick to determine the direction into which the vehicle is steered and the return to center means (7) produce a restoring force on the handle (5) in a direction towards a neutral position of the handle (5). Such a system should help an operator to steer a vehicle in a safe manner. To this end the joystick (3) can be operated in a second mode, in which the vehicle can be steered by a GPS-System, wherein in the second mode the return to center means (7) move the handle (5) in a position corresponding to a steering angle of the steering motor (2).

IPC Classes  ?

• B62D 5/00 - Power-assisted or power-driven steering
• B62D 1/12 - Hand levers
• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
• B62D 15/02 - Steering position indicators

Abstract

A shock-valve (1) comprising a housing (2) having an inlet (3) connected to a chamber (4) and an outlet, a valve seat section having a valve seat (12) and being arranged in the housing (12), a valve element (7) cooperating with the valve seat (12), and biasing means (8) acting on the valve element (7) in a direction towards the valve seat (12) is described, wherein a channel arrangement extends from the chamber (4) to the valve seat (12). Such a shock-valve should have a low noise during operation. To this end the valve seat section is formed in a valve seat element (6) arranged betweeen the inlet (3) and the outlet, a pressure in the chamber (4) acting on the valve element (7) to move the valve element (7) away from the valve seat (12) of the valve seat element (6), and the channel arrangement forms an odd number of flow paths larger than two.

IPC Classes  ?

• F16K 15/06 - Check valves with guided rigid valve members with guided stems
• F16K 47/08 - Means in valves for absorbing fluid energy for decreasing pressure and having a throttling member separate from the closure member
• F16K 1/42 - Valve seats
• F16K 17/04 - Safety valvesEqualising valves opening on surplus pressure on one sideSafety valvesEqualising valves closing on insufficient pressure on one side spring-loaded

Abstract

The lifting mechanism includes a battery, an electric machine, a hydraulic pump, an oil tank, a hydraulic cylinder, a work platform and a proportional valve or switch valve. In the energy-regeneration mode, the hydraulic fluid drives the hydraulic pump to operate as a hydraulic motor, thus in turn driving the electric machine to operate as a generator and charge the battery. In the present application, the hydraulic pump operates to increase a pressure in a hydraulic line between the hydraulic pump and the proportional valve or switch valve before the proportional valve or switch valve is switched from a unidirectional communication position to a bidirectional communication position. When the proportional valve or switch valve is switched from the unidirectional communication position to the bidirectional communication position, by increasing the pressure in the hydraulic line, it could be avoided that the volume of hydraulic fluid has low pressure is compressed because the hydraulic fluid has low pressure is communicated with hydraulic fluid has high pressure; therefore a state of sudden drop of the work platform is avoided, and safety performance and operating experience of the lifting mechanism is improved.

IPC Classes  ?

• B66F 3/32 - Means for avoiding excessive shocks on completion movements
• F15B 11/04 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed
• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
• F15B 13/06 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
• F15B 15/18 - Combined units comprising both motor and pump
• F15B 11/028 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the actuating force
• F15B 11/044 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed by means in the return line
• F15B 11/068 - Servomotor systems without provision for follow-up action involving features specific to the use of a compressible medium, e.g. air, steam with valves for gradually putting pneumatic systems under pressure
• F15B 20/00 - Safety arrangements for fluid actuator systemsApplications of safety devices in fluid actuator systemsEmergency measures for fluid actuator systems

Abstract

A lifting mechanism has a descending mode including an energy-regeneration mode and a non-energy-regeneration mode. The lifting mechanism includes: a battery, an electric machine, a hydraulic pump, an oil tank, a hydraulic cylinder, a work platform and a flow limiting valve. In the energy-regeneration mode, the hydraulic fluid drives the hydraulic pump to operate as a hydraulic motor, thus in turn driving the electric machine to operate as a generator and charge the battery. In the non-energy-regeneration mode, the flow limiting valve limits the maximum of the descending speed of the work platform. In the present application, the flow limiting valve is used to provide throttling resistance to limit the maximum of the descending speed of the hydraulic fluid, thus in turn defining the maximum of the descending speed of the work platform. Therefore, in the present application, by using the flow limiting valve to define the maximum of the descending speed of the work platform, the safety problem due to an accelerated descent during descending of the work platform may be solved, and thus the safety of the lifting mechanism may be ensured.

IPC Classes  ?

• B66F 3/32 - Means for avoiding excessive shocks on completion movements
• F15B 11/04 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed
• F15B 15/18 - Combined units comprising both motor and pump
• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

Abstract

A hydraulic control system for linear actuation that provides a bypass flow during startup of a lifting command, provides a split flow between a cylinder and a reservoir once a minimum operating speed of a pump has been reached, and provides complete flow to a cylinder after the minimum operating speed of the pump has been reached. This is achieved through control of a flow control valve and a proportional flow control valve by a processor.

IPC Classes  ?

• F15B 11/08 - Servomotor systems without provision for follow-up action with only one servomotor
• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
• F15B 13/042 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
• F15B 13/044 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors

Abstract

In the present application, a lifting mechanism is provided. The lifting mechanism includes a battery, an electric machine, a hydraulic pump, an oil tank, a hydraulic cylinder, a work platform and a proPortional valve or switch valve. In the energy-regeneration mode, the hydraulic fluid drives the hydraulic pump to operate as a hydraulic motor, thus in turn driving the electric machine to operate as a generator and charge the battery. In the present application, the hydraulic pump operates to increase a pressure in a hydraulic line between the hydraulic pump and the proportional valve or switch valve before the proportional valve or switch valve is switched from a unidirectional communication position to a bidirectional communication position. When the proportional valve or switch valve is switched from the unidirectional communication position to the bidirectional communication position, by increasing the pressure in the hydraulic line, it could be avoided that the volume of hydraulic fluid has low pressure is compressed because the hydraulic fluid has low pressure is communicated with hydraulic fluid has high pressure; therefore a state of sudden drop of the work platform is avoided, and safety performance and operating experience of the lifting mechanism is improved.

IPC Classes  ?

• B66F 3/24 - Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
• B66F 7/28 - Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
• B66F 9/22 - Hydraulic devices or systems
• F15B 21/08 - Servomotor systems incorporating electrically- operated control means

Abstract

In the present application, a lifting mechanism is provided. The lifting mechanism has a descending mode comprising an energy-regeneration mode and a non-energy-regeneration mode. The lifting mechanism comprises: a battery, an electric machine, a hydraulic pump, an oil tank, a hydraulic cylinder, a work platform and a flow limiting valve. In the energy-regeneration mode, the hydraulic fluid drives the hydraulic pump to operate as a hydraulic motor, thus in turn driving the electric machine to operate as a generator and charge the battery. In the non-energy-regeneration mode, the flow limiting valve limits the maximum of the descending speed of the work platform. In the present application, the flow limiting valve is used to provide throttling resistance to limit the maximum of the descending speed of the hydraulic fluid, thus in turn defining the maximum of the descending speed of the work platform. Therefore, in the present application, by using the flow limiting valve to define the maximum of the descending speed of the work platform, the safety problem due to an accelerated descent during descending of the work platform may be solved, and thus the safety of the lifting mechanism may be ensured.

IPC Classes  ?

• B66F 3/24 - Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
• B66F 7/28 - Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
• B66F 9/22 - Hydraulic devices or systems
• F15B 21/08 - Servomotor systems incorporating electrically- operated control means

Abstract

A system for calibrating an electrohydraulic pump using a micro-controller that has software that may command the engine to a speed value and to uncommand the electrohydraulic pump such that a baseline engine load is defined. The software may also, thereafter, command the electrohydraulic pump to ramp up until the electrohydraulic pump goes into stroke thereby increasing the engine load to an amount over the baseline engine load. When this occurs, the software may define a start current value for that direction of the electrohydraulic pump.

IPC Classes  ?

• F04B 49/06 - Control using electricity
• F04B 17/03 - Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
• F04B 51/00 - Testing machines, pumps, or pumping installations
• F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors

Abstract

A hydraulic piston unit including a rotational group for driving or being driven by a driving shaft, and having a tiltable displacement element for adjusting the displacement volume of the rotational group between a minimum or a maximum displacement, wherein, on t valve segment between a kidney-shaped inlet port and a kidney-shaped outlet port at respective dead end positions of reciprocally moveable working pistons first and second control ports are located in fluid connection with cylinder bores in the cylinder block, for controlling the position of the displacement element. The hydraulic piston unit further includes a control valve with a shiftable control valve spool fluidly connected via a high pressure port to a high pressure side of the hydraulic piston unit. The control valve spool is configured to conduct hydraulic fluid from the high pressure side to one of the first or the second control port.

IPC Classes  ?

• F03C 1/06 - Reciprocating-piston liquid engines with multiple cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
• F03C 1/00 - Reciprocating-piston liquid engines
• F04B 1/122 - Details or component parts, e.g. valves, sealings or lubrication means
• F04B 1/20 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
• F04B 1/324 - Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
• F03C 1/08 - Distributing valve-gear peculiar thereto

Abstract

A hydraulic steering arrangement (1) including a supply port (2), a return port (4), a working port arrangement having two working ports (5, 6), a main flow path (7) between the supply port (2) and one of the working ports (5) and a return flow path (8) between the other working port (6) and the return port (4), wherein the main flow path (7) includes a main orifice (A1), a flow meter (9), a first flow meter orifice (A2) upstream the flow meter (9), a second flow meter orifice (A3) downstream the flow meter (9), and a first working port orifice (A4), the return flow path (8) includes a second working port orifice (A5), a load sensing point (17) is arranged between the main orifice (A1) and the first flow meter orifice (A2), a drain orifice (Ad) is arranged between the load sensing point (17) and the return port (4), and a priority valve arrangement (10) is arranged between the supply port (2) and the main orifice (A1). Such a steering arrangement should enable a high steering speed without loss of comfort. To this end a load sensing port (16) of the priority valve arrangement (10) is connected to the load sensing point (17), characterized in that a priority outlet (CF) of the priority valve arrangement (10) is directly connected to the main orifice (A1), the load sensing port (16) of the priority valve arrangement (10) is directly connected to the load sensing point (17) and the main flow path (7) includes a check valve (24) between the load sensing point (17) and the working port (5) of the main flow path (7), the check valve (24) opening in a direction towards the working port (5).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/07 - Supply of pressurised fluid for steering also supplying other consumers
• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves

Abstract

b) connected to the housing arrangement (13, 14; 19, 20).

IPC Classes  ?

• F15B 13/08 - Assemblies of units, each for the control of a single servomotor only
• F16K 11/07 - Multiple-way valves, e.g. mixing valvesPipe fittings incorporating such valvesArrangement of valves and flow lines specially adapted for mixing fluid with all movable sealing faces moving as one unit comprising only sliding valves with linearly sliding closure members with cylindrical slides

Abstract

A hydraulic circuit arrangement includes a plurality of electronically- commutated pumps (10a-10f) providing flow to a common hydraulic line (65), each of the electronically-commutated pumps provided with an associated electronically-commutated pump controller (18a-18f). The plurality of electronically-commutated pumps (10a-10f) includes one or more quantized electronically-commutated pumps and one or more unquantized electronically-commutated pumps, wherein the one or more quantized electronically-commutated pumps (10a) are configured to produce a quantized target flow value that is less than a total target flow value determined for the common hydraulic line, and wherein the one or more unquantized electronically-commutated pumps (10b) are configured to produce an unquantized target flow value that is the difference between the quantized target flow value and the total target flow value.

IPC Classes  ?

• F04B 23/06 - Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
• F04B 7/00 - Piston machines or pumps characterised by having positively-driven valving
• F04B 1/06 - Control
• F04B 49/06 - Control using electricity
• F04B 11/00 - Equalisation of pulses, e.g. by use of air vesselsCounteracting cavitation

Abstract

Hydraulic fan system and method for controlling the speed of a hydraulic fan system. The fan system comprises a fan operated by a hydraulic motor which is driven by a hydraulic variable displacement pump comprising a displacement volume adjusting element. A tilt angle of the displacement volume adjusting element can be adjusted by controlling a tilt current supplied to an electronic displacement control unit. The hydraulic fan system further comprises means for determining the volumetric flow rate of the pump and a control unit comprising: a signal connection to the means for determining the volumetric flow rate of the pump, a signal connection to a fan speed setting device, and a fan speed calculating unit for calculating a fan speed from the determined volumetric flow rate, a fan speed error determining unit for determining a fan speed error by comparing the calculated fan speed to the fan speed set by the fan speed setting device. The control unit can supply an adapted tilt current to the electronic displacement control unit in order to adjust the tilt angle of the displacement volume adjusting device, such that the volumetric flow rate can be adapted in order to reduce the fan speed error, wherein an ideal tilt current value is derived from the calculated fan speed and safety actions are performed in order to prevent damage to the fan, if the difference between the ideal tilt current value and the adapted tilt current is higher than a tilt current threshold value.

IPC Classes  ?

• F04D 27/00 - Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
• F04D 25/04 - Units comprising pumps and their driving means the pump being fluid-driven
• F02D 25/04 - Controlling two or more co-operating engines by cutting-out engines

Goods & Services

Fittings of metal for hydraulic hoses

Abstract

The present invention concerns a hydrostatic transmission (1) and a method to control the characteristics of a hydrostatic transmission (1) having an engine (2), a first and second hydraulic unit (4, 5) and a drive unit (3) which are connected to the control unit (10) having a memory unit, wherein each hydraulic unit comprises a sensor unit (8a, 8b), wherein the first and the second hydraulic units (4,5) are connected through a first fluid and second fluid connection (6,7) having a fluid connection sensor unit (9a, 9b) each. The objective of this invention is to reduce the risk of engine overloads. This objective is solved by a hydrostatic transmission (1) wherein the speed sensors and the sensor units (8a, 8b, 9a, 9b) are connected to the control unit (10), which controls a displacement of the hydraulic units (4,5) based on a set point, a regulation factor, hydraulic unit commands, operator commands, information provided by the memory unit and sensor outputs.

IPC Classes  ?

• F16H 39/02 - Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motors at a distance from liquid pumps
• F16H 61/40 - Control of exclusively fluid gearing hydrostatic
• F16H 61/423 - Motor capacity control by fluid pressure control means
• F16H 61/433 - Pump capacity control by fluid pressure control means
• F16H 61/42 - Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
• F16H 61/4157 - Control of braking, e.g. preventing pump over-speeding when motor acts as a pump

Goods & Services

Radial piston motors other than for land vehicles and parts therefor Radial piston motors for land vehicles

Goods & Services

Mobile electrohydraulic drives for the agriculture, construction, material handling, forestry & mining industry (off-highway equipment).

Abstract

A moveable machine (1) comprises an antenna arrangement, a control unit controlling the machine (1), a distance determining unit determining a distance between the antenna arrangement and a remote control means (5), wherein the distance determining unit is connected to the control unit. The problem of this invention is to increase the operator's safety. Therefore the antenna arrangement comprises a first antenna (2) and a second antenna (3), wherein the first antenna (2) is arranged distanced to the second antenna (3), wherein the distance determining unit determines a first distance (6) between the first antenna (2) and the remote control means (5) and a second distance (7) between the second antenna (3) and the remote control means (5).

IPC Classes  ?

• G01S 5/14 - Determining absolute distances from a plurality of spaced points of known location

Abstract

A system and method for secure remote control of a machine includes transmitting video data from a camera on the machine to an operator controller located at a remote operation station, and receiving, at a machine controller of the machine, an operator control message from the operator controller. The operator control message is based on an input device actuated in response to the video data. The method further includes confirming validity of the operator control message based, at least in part, on the video data transmitted from the camera to the operator controller, and controlling the machine with the operator control message when validity of the operator control message is confirmed.

IPC Classes  ?

• G05D 1/00 - Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
• G05B 19/045 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using logic state machines, consisting only of a memory or a programmable logic device containing the logic for the controlled machine and in which the state of its outputs is dependent on the state of its inputs or part of its own output states, e.g. binary decision controllers, finite state controllers

Abstract

An anti-stall system to prevent an engine, particularly a low-powered engine, from stalling when encountering a load that the machine is capable of overcoming but due to the nature of the engine, the load encounter would result in a stall. The system includes a hydraulic system in communication with a control system that has one or more sensors that detect, determine, and/or transmit an operational variable. The control system further comprises a plurality of anti-stall blocks having unique configurations, including a first configured to limit output flow upon determination of an engine droop, a second configured to limit output flow based on available engine torque, a third configured to limit output pressure upon rapid engine droop detection, and a fourth configured to prioritize and share output flow between the machine functions. The anti-stall blocks provide for complementary and cooperative configuration to prevent a stall from occurring based on responses to the detection and determination of various dynamic and continuous operational variables in real-time or near real-time with operational parameters.

IPC Classes  ?

• E02F 9/22 - Hydraulic or pneumatic drives
• F02B 63/06 - Adaptations of engines for driving pumps, hand-held tools or electric generatorsPortable combinations of engines with engine-driven devices for pumps
• F02D 29/04 - Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
• F15B 20/00 - Safety arrangements for fluid actuator systemsApplications of safety devices in fluid actuator systemsEmergency measures for fluid actuator systems
• E02F 9/20 - DrivesControl devices

Abstract

A hydraulic control system for linear actuation that includes an electric motor connected to a hydraulic pump and a hydraulic cylinder connected to the pump by a first flow line. A pressure transducer, a pressure control valve, and a check valve are connected to the first flow line between the pump and the cylinder and a tank is connected to the pump by a second flow line and the cylinder by a return line. A control valve is connected between the first flow line and the return line.

IPC Classes  ?

• F04B 23/02 - Pumping installations or systems having reservoirs

Goods & Services

Fittings of metal for hydraulic hoses.

Goods & Services

Radial piston motors [other than for land vehicles] and parts therefor. Radial piston motors for land vehicles.

Abstract

A hydraulic control system for linear actuation that provides a bypass flow during startup of a lifting command, provides a split flow between a cylinder and a reservoir once a minimum operating speed of a pump has been reached, and provides complete flow to a cylinder after the minimum operating speed of the pump has been reached. This is achieved through control of a flow control valve and a proportional flow control valve by a processor.

IPC Classes  ?

• B66F 7/08 - Lifting frames, e.g. for lifting vehiclesPlatform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
• B66F 9/22 - Hydraulic devices or systems

Abstract

The invention relates to a method (19) of operating a hydraulic arrangement (1) including a mounting base (5), a boom (3) that is pivotably arranged on the mounting base (5), and a Z-kinematics (2) that is arranged on the boom (3). The Z-kinematics (2) tilts a tool attachment device (10), that is pivotably arranged on the boom (3). The boom (3) is moved by a lifting hydraulic piston (7) that is connected to the boom (3) and to the mounting base (5). The Z-kinematics (2) is moved by at least a tilting hydraulic piston (11) that is connected to a lever of the Z-kinematics (2) and to the mounting base (5). On application of an input control command for changing the position of the lifting hydraulic piston (7), a compensation command is automatically generated and applied to the tilting hydraulic piston (11), to essentially maintain the attitude of the tool attachment device (10). The compensation command is generated based on the input control command for the lifting hydraulic piston (7), using a mathematical model of the hydraulic arrangement (1).

IPC Classes  ?

• E02F 3/34 - DredgersSoil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, e.g. dippers, buckets with bucket-arms directly pivoted on the frames of tractors or self-propelled machines
• E02F 3/43 - Control of dipper or bucket positionControl of sequence of drive operations
• E02F 9/20 - DrivesControl devices
• E02F 9/22 - Hydraulic or pneumatic drives

Abstract

A control arrangement for a variable displacement pump includes a pressure control unit and a separate mechanical control unit, each mounted on a housing of the variable displacement pump. The pressure control unit provides pressure control for the variable displacement pump and the mechanical control unit provides rotary feedback control for the variable displacement pump.

IPC Classes  ?

• F04B 49/08 - Regulating by delivery pressure
• F04B 9/04 - Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
• F04B 1/295 - Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
• F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
• F04B 49/12 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by varying the length of stroke of the working members

Abstract

A fluid controller (1), in particular as part of a hydraulic steering unit, is described, said controller (1) comprising a housing (2) having a supply port arrangement, a sleeve (4) arranged rotatably in a bore of the housing (2), a spool (3) arranged rotatably in the sleeve (4), and a measuring motor, wherein the measuring motor comprises a plurality of working chambers, each working chamber being connected to the bore, wherein the sleeve (4) comprises a commutation geometry (7) having a number of pairs of commutation grooves (12, 13) and controlling together with a housing geometry (5) of the housing (2) a flow of hydraulic fluid into and out of the working chambers and the spool (3) comprises a spool geometry controlling together with a valve geometry of the sleeve (4) a flow of hydraulic fluid between the supply port arrangement and the commutation geometry. Such a fluid controller should have a stable control behaviour. To this end at least one of the commutation grooves (12, 13) comprise a closed bottom and at least one of the commutation grooves (12, 13) comprise a throughgoing opening (10, 11) forming part of the valve geometry.

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/087 - Sliding spool valves
• B62D 5/12 - Piston and cylinder

Abstract

A fluid controller (1), in particular as part of a hydraulic steering unit, is described said controller (1) comprising a housing (2) having a supply port arrangement, a sleeve (4) arranged rotatably in a bore of the housing (2), a spool (3) arranged rotatably in the sleeve (4), and a measuring motor, wherein the measuring motor comprises a plurality of working chambers, each working chamber being connected to the bore, wherein the sleeve (4) comprises a commutation geometry (7) having a first partition and controlling together with a housing geometry (5) of the housing (2) a flow of hydraulic fluid into and out of the working chambers and the spool (3) comprises a spool geometry (14) controlling together with a valve geometry (10, 11) of the sleeve (4) a flow of hydraulic fluid between the supply port arrangement and the commutation geometry. Such a fluid controller should have a stable control behavior. To this end the valve geometry (10,11) comprises a second partition different from the first partition.

IPC Classes  ?

• B62D 5/08 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of valve used
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/087 - Sliding spool valves
• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist

Abstract

The invention relates to a hydraulic steering unit (1) including a housing (3), a spool, a sleeve (12) arranged between spool and housing (3), and a measuring motor (14) having a number of working chambers (15), wherein a first commutation geometry (18) and a second commutation geometry (19) are arranged between the sleeve (12) and the housing (3), wherein the commutation geometries (18, 19) are connected to the working chambers (15) of the measuring motor (14) and the housing includes a first direction port (4), a second direction port (5), a pressure port (6), and a return port (7). The object is to have a good steering behavior. To this end one of the commutation geometries (18) is directly connected to the first direction port (4).

IPC Classes  ?

• B62D 5/087 - Sliding spool valves
• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves

Abstract

A valve arrangement is described comprising a housing arrangement (12), (18), a first spool valve (1a, 1b) having a first spool (3a, 3b) and a second spool valve (2a, 2b) having a second spool (4a, 4b), wherein the first spool valve (1a, 1b) and the second spool valve (2a, 2b) each comprise a supply channel arrangement having a pump channel (5) and a tank channel (6), and a working port arrangement having two working ports (8, 9), wherein the spools (3a, 3b; 4a, 4b) control a flow path between the supply channel arrangement (5, 6) and the working port arrangements (7, 8). In such a valve arrangement it should be possible to simply adapt the control behaviour to different purposes. To this end the working port arrangement (7, 8) is arranged in a flange (16a, 16b) connected to the housing arrangement (13, 14; 19, 20).

IPC Classes  ?

• F15B 13/08 - Assemblies of units, each for the control of a single servomotor only
• F15B 11/00 - Servomotor systems without provision for follow-up action
• F15B 13/00 - Details of servomotor systems

Abstract

Hydraulic axial piston unit having a rotational group for driving or being driven by a driving shaft, and a tiltable displacement element for adjusting the displacement volume of the rotational group. The rotational group includes a rotatable cylinder block in which working pistons are mounted reciprocally moveable in cylinder bores for conveying hydraulic fluid from an inlet port to an outlet port on a valve segment. At least two control ports are located on the valve segment each between the inlet port and the outlet port. The control ports can be brought sequentially in fluid connection with the cylinder bores when the cylinder block is rotating. At least one hydraulic fluid injector is connected fluidly to one control port, for sequentially injecting pressurized hydraulic fluid via the control port into the passing cylinder bores. Via the other control port hydraulic fluid can be drained from passing cylinder bores.

IPC Classes  ?

• F04B 1/26 - Control
• F01B 3/00 - Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
• F04B 1/30 - Control of machines or pumps with rotary cylinder blocks
• F04B 1/34 - Control not provided for in groups , , or
• F04B 1/20 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
• F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
• F04B 49/12 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by varying the length of stroke of the working members

Abstract

An electric displacement control system has a hydraulic variable displacement pump that operates in an open hydraulic circuit. A servo piston is disposed within a servo bore that is connected to the hydraulic variable displacement pump. Located in the servo bore is a control spool valve having an orifice that vents fluid pressure from the servo bore to a pump case. The flow rate of the system depends upon a fluid force between a feedback spring on a first side of the control spool valve and a solenoid actuator force on a second side of the control spool valve.

IPC Classes  ?

• F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
• F04B 17/00 - Pumps characterised by combination with, or adaptation to, specific driving engines or motors
• F04B 49/22 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by means of valves

Abstract

A hydraulic steering unit includes a pressure port connected to a main flow path and a tank port connected to a tank flow path, and a working port arrangement having left and right working flow paths. A first bridge arrangement has first left and first right orifices connected to the main flow path and to first left or first right connecting points, respectively, each connecting point associated respectively with the left or right working flow paths, and second left and second right orifices connected to the tank flow path and to the first left or first right connecting points, respectively. A second bridge arrangement has a similar orifice arrangement connected to second left or second right connecting points. The first and second bridge arrangements have different steering characteristics. Selection means for connecting one of the bridge arrangements between the pressure port and the working port arrangement are provided.

IPC Classes  ?

• B62D 5/08 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of valve used
• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 5/14 - Rotary motor

Abstract

Automatic tilt command system of a hydraulically driven boom moveably connected with one end to a chassis of a working machine, wherein a tiltable tool is attachable to the other end. The system further comprises a first electronic control valve for controlling a fluid flow to and from a boom lift cylinder for moving of the boom and a second electronic control valve for controlling a fluid flow to and from a tilt cylinder for tilting the tool. A control unit receives input signals with regard to moving the boom and transmits based on the received input signals actuating signals to the first electronic control valve in order to move the boom. In parallel the control unit transmits tilting signals to the second electronic control valve which are based on a predetermined fluid flow ratio defined by the fluid flow for the boom movement and the fluid flow for tool levelling, so that the tool maintains its inclination angle with respect to the horizontal.

IPC Classes  ?

• E02F 9/22 - Hydraulic or pneumatic drives
• F15B 13/044 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors

Abstract

A hydraulic steering arrangement includes a supply port arrangement having at least a supply port, a return port arrangement having at least a return port, a working port arrangement having two working ports, a first valve arrangement having a first supply side connected to the supply port arrangement and a first output side connected to the working port arrangement, a second valve arrangement having a second supply side connected to the supply port arrangement and a second output side connected to the working port arrangement, and a steering command device. In a neutral steering angle, the second valve arrangement connects the first output side to the return port arrangement and the first valve arrangement connects the second output side to the return port arrangement.

IPC Classes  ?

• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves

Abstract

A bearing assembly having an inner race, an outer race, and a plurality of rollers positioned between the inner race and the outer race. A pad is attached to the inner race and a bed is attached to the outer race. A timing mechanism is slidably mounted to the pad and the bed. Preferably the pad and bed are made of plastic and the inner race is embedded within the pad and the outer race is embedded within the bed.

IPC Classes  ?

• F04B 1/2085 - Bearings for swash plates or driving axles
• F16C 19/50 - Other types of ball or roller bearings
• F16C 33/30 - Parts of ball or roller bearings
• F16C 33/58 - RacewaysRace rings
• B33Y 80/00 - Products made by additive manufacturing

Abstract

The invention relates to a method (25) of determining the health status of a hydraulic circuit arrangement comprising at least one hydraulic fluid working machine (2, 3). The health status is determined (29) using at least in part an actual temperature information (12) of the hydraulic circuit arrangement (1) that is compared to an expected temperature information (24) of the hydraulic circuit arrangement (1).

IPC Classes  ?

• F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere
• G08B 21/24 - Reminder alarms, e.g. anti-loss alarms
• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

Abstract

The invention relates to a method (25) of determining the health status of a hydraulic circuit arrangement comprising at least one hydraulic fluid working machine (2, 3). The health status is determined (29) using at least in part an actual temperature information (12) of the hydraulic circuit arrangement (1) that is compared to an expected temperature information (24) of the hydraulic circuit arrangement (1).

IPC Classes  ?

• F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere
• E02F 9/26 - Indicating devices
• F16H 61/4192 - Detecting malfunction or potential malfunction, e.g. fail safe

Abstract

A hydraulic steering unit includes a pressure port connected to a main flow path and a tank port connected to a tank flow path, left and right working ports connected to left and right working flow paths, respectively, a bridge arrangement of variable orifices having a first left orifice connected to the main flow path and to the left working flow path, a first right orifice connected to the main flow path and to the right working flow path, a second left orifice connected to the left working flow path and to the tank flow path, and a second right orifice connected to the right working flow path and to the tank flow path. A variable diagonal orifice is connected to the main flow path and to the tank flow path. The bridge arrangement orifices being closed in neutral position and the diagonal orifice being open in neutral position.

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 5/08 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of valve used
• B62D 5/083 - Rotary valves
• B62D 3/14 - Steering gears hydraulic
• B62D 5/10 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit

Abstract

An electric torque and pressure control for load sensing pumps includes a variable open circuit pump with a swash plate angle sensor. The pump is connected in line with a pressure compensated load sensing control having an electrically variable pressure relief valve and orifice. Connected to the circuit is an engine speed sensor, a user input device, and a micro-controller. The micro-controller has software that controls a pressure relief setting of the electrically variable pressure relief valve in the pressure sensing control based upon signals from the swash plate sensor and the engine speed sensor and inputs from the user input device.

IPC Classes  ?

• F04B 49/02 - Stopping, starting, unloading or idling control
• F04B 49/06 - Control using electricity

Abstract

A hydrostatic system that provides different volumetric efficiency at different states and includes a pump with a discharge and supply line. Connected between the discharge and supply line is a valve. The valve is adapted to move to a position having a cross port orifice when the pump is in a neutral state and a position where the ports are blocked when the pump is in an operation state.

IPC Classes  ?

• F04B 49/08 - Regulating by delivery pressure
• F04B 49/24 - Bypassing
• F04B 49/035 - Bypassing
• F04B 49/02 - Stopping, starting, unloading or idling control

Abstract

A bearing attachment system for a pump product having a seal carrier and a cover plate. The attachment system is configured to produce a force deflection curve that provides a clamping force on a pair of tapered roller bearings such that a tight bearing endplay on the tapered roller bearings is maintained through a full range of manufacturing tolerances. The geometric shape of the cover plate and the top surface of the seal carrier provide the desired deflection characteristics.

IPC Classes  ?

• F16C 35/07 - Fixing them on the shaft or housing with interposition of an element
• F16C 27/04 - Ball or roller bearings, e.g. with resilient rolling bodies
• F16C 33/78 - Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
• F16C 35/067 - Fixing them in a housing

Abstract

A thermal relief device (1) is described comprising a housing (2) having an inlet (3) and an outlet (4) connected by a relief channel (5). Such a thermal relief device should have a simple construction. To this end a microporous structure (10) is arranged between inlet (3) and outlet (4).

IPC Classes  ?

• G05D 7/01 - Control of flow without auxiliary power

Abstract

A system and method for secure remote control of a machine includes transmitting video data from a camera on the machine to an operator controller located at a remote operation station, and receiving, at a machine controller of the machine, an operator control message from the operator controller. The operator control message is based on an input device actuated in response to the video data. The method further includes confirming validity of the operator control message based, at least in part, on the video data transmitted from the camera to the operator controller, and controlling the machine with the operator control message when validity of the operator control message is confirmed.

IPC Classes  ?

• H04L 29/06 - Communication control; Communication processing characterised by a protocol
• H04L 1/00 - Arrangements for detecting or preventing errors in the information received

Abstract

A method for controlling a hydraulic actuator (2) of a system (1) by means of a valve having a valve element is described. A position of the valve element determines a pressure supplied to a hydraulic actuator (2). In such a method a variable dead band should be minimized. To this end a start position of the valve element is preadjusted as a function of at least one parameter outside the hydraulic actuator (2).

IPC Classes  ?

• E02F 9/22 - Hydraulic or pneumatic drives
• F15B 7/00 - Fluid-pressure actuator systems in which the movement produced is definitely related to the output of a volumetric pumpTelemotors
• F15B 7/06 - Fluid-pressure actuator systems in which the movement produced is definitely related to the output of a volumetric pumpTelemotors Details
• F16K 11/07 - Multiple-way valves, e.g. mixing valvesPipe fittings incorporating such valvesArrangement of valves and flow lines specially adapted for mixing fluid with all movable sealing faces moving as one unit comprising only sliding valves with linearly sliding closure members with cylindrical slides

Abstract

According to the present disclosure, a system for providing steering control in a dual path machine includes a propulsion controller operatively connected to plants of the machine for driving ground contacting elements, the propulsion controller being configured to control steering of the dual path machine through drive signals sent to the plants, and a brake controller operatively connected to left and right brakes of the machine, the brake controller being configured to control steering of the machine by providing differential brake pressures to the left and right brakes. The system of the present disclosure provides redundant steering control by receiving an input signal at the brake controller with an indication of steering position, receiving an input signal at the brake controller with an indication of brake position, and providing a differential brake pressure to brakes of the dual path machine based on the steering input signal and brake input signal.

IPC Classes  ?

• B60W 50/035 - Bringing the control units into a predefined state, e.g. giving priority to particular actuators
• B60W 10/04 - Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
• B60W 10/184 - Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes
• B60W 30/18 - Propelling the vehicle

Abstract

A pressure limiting system for a dual path machine wherein an input propel command from a propel device is scaled based upon the largest detected pressure in a hydraulic system to determine a modified propel command. Also, response time is adjusted within an electrical control system based upon the type of input propel command signal received.

IPC Classes  ?

• B62D 11/00 - Steering non-deflectable wheelsSteering endless tracks or the like
• F16H 61/431 - Pump capacity control by electro-hydraulic control means, e.g. using solenoid valve
• F16H 61/438 - Control of forward-reverse switching, e.g. control of the swash plate causing discharge in two directions

Abstract

A steering wheel arrangement 1 is described comprising a steering wheel (2) having a rim (3) and a steering column 4 rotatably supported in the housing (5) and connected to the rim (3), wherein an electric machine (9, 13, 14) is operatively connected to the steering wheel (2). Such a steering wheel arrangement should be able to produce a force feedback to a traditional steering wheel in a reliable low-cost solution with a high functional safety rating. To this end electric machine (9, 13, 14) is integrated in the rim (3).

IPC Classes  ?

• B62D 5/04 - Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
• B62D 5/00 - Power-assisted or power-driven steering

Abstract

A steering command means (1) is described comprising a joystick (2) and an arm rest (3) having an arm support surface (4), wherein the joystick (2) comprises a handle member (5) and a grip surface (6) is located on a circumference of the handle member (5). A risk of unintended steering input in a vibrating environment should be minimized. To this end an axis (9) of rotation of the handle member (5) runs through a space surrounded by the grip surface (6).

IPC Classes  ?

• G05G 1/04 - Controlling members for hand-actuation by pivoting movement, e.g. levers
• G05G 9/04 - Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
• G05G 9/047 - Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks

Abstract

U1) which is controlled as function of the steering unit (2). Such a steering arrangement should have a possibility to change the steering behaviour. To this end at least a third flow path (14) in form of an amplification flow path is arranged in parallel to the second flow path (13), wherein the second/or the third flow path (13, 14) comprise an valve (15).

IPC Classes  ?

• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle

Abstract

A hydraulic steering arrangement (1) comprising a supply port arrangement having a pressure port and a tank port, a working port arrangement having two working ports (L, R), a mechanical steering unit (3) connected to a steering wheel (2) and being arranged between the supply port arrangement and the working port arrangement (L, R), supply valve means (12) having a connection to the pressure port and to the working port arrangement (L, R) and being controlled by a controller (10), and a steering wheel sensor (9) connected to the controller (10) is described. Such a steering arrangement could allow a comfortable feeling for the driver. To this end the steering wheel sensor (9) is mounted in a position of minimum play to steering wheel (2) and steering wheel sensor (9) and detects a beginning of a movement of the steering wheel (2), wherein the controller (10) actuates the supply valve means (12) upon beginning of the movement, and the supply valve means (12) supply hydraulic fluid to the working port arrangement (L, R).

IPC Classes  ?

• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 6/00 - Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
• B60W 10/20 - Conjoint control of vehicle sub-units of different type or different function including control of steering systems

Abstract

U).

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• B62D 5/30 - Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
• B62D 5/09 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves

Abstract

According to the present disclosure, a steering system and method for a machine includes a vehicle control system configured to command steering of the machine, and a steering sensor in communication with the vehicle control system. The steering sensor is configured to detect a position of a steering actuator of the machine. The vehicle control system is configured to detect an acceleration rate of the machine and to command steering of the machine based at least in part on the position of the steering actuator and the acceleration rate of the machine.

IPC Classes  ?

• B62D 5/04 - Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
• B60W 10/08 - Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
• B60W 10/20 - Conjoint control of vehicle sub-units of different type or different function including control of steering systems

Abstract

A hydraulic piston unit including a rotational group for driving or being driven by a driving shaft, and having a tiltable displacement element for adjusting the displacement volume of the rotational group between a minimum or a maximum displacement, wherein, on t valve segment between a kidney-shaped inlet port and a kidney-shaped outlet port at respective dead end positions of reciprocally moveable working pistons first and second control ports are located in fluid connection with cylinder bores in the cylinder block, for controlling the position of the displacement element. The hydraulic piston unit further includes a control valve with a shiftable control valve spool fluidly connected via a high pressure port to a high pressure side of the hydraulic piston unit. The control valve spool is configured to conduct hydraulic fluid from the high pressure side to one of the first or the second control port.

IPC Classes  ?

• F03C 1/06 - Reciprocating-piston liquid engines with multiple cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
• F03C 1/00 - Reciprocating-piston liquid engines
• F03C 1/08 - Distributing valve-gear peculiar thereto
• F04B 1/20 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
• F04B 1/32 - Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
• F04B 1/12 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
• F04B 1/122 - Details or component parts, e.g. valves, sealings or lubrication means
• F04B 1/324 - Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate

Abstract

A hydraulic steering unit is described comprising a housing (1) and a non-return valve (2) having a ball (3) and a valve seat (4) at an end of a channel (5) in the housing (1), wherein a movement of the ball (3) away from the valve seat (4) is limited by an abutment (7) in the channel (5). Such a steering unit should have a non-return valve which can be produced with low costs. To this end the abutment (7) extends transversely through the channel.

IPC Classes  ?

• F16K 15/04 - Check valves with guided rigid valve members shaped as balls
• B62D 3/14 - Steering gears hydraulic

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (P) connected to a main flow path (2) and a tank port (T) connected to a tank flow path (3), a working port arrangement having a left working port (L) connected to a left working flow path (9) and a right working port (R) connected to a right working flow path (10), a first bridge arrangement (15a, 15b) of variable orifices having a first left orifice (A2L) connected to the main flow path (2) and to a first left connecting point (16) at the left working flow path (9), a first right orifice (A2R) connected to the main flow path (2) and to a first right connecting point (17) at the right working flow path (10), a second left orifice (A3L) connected to the first left connecting point (16) at the left working flow path (9) and to the tank flow path (3), and a second right orifice (A3R) connected to the first right connecting point (17) at the right working flow path (10) and to the tank flow path (3). It should be possible to change the steering characteristics of such a steering unit. This is achieved by at least a second bridge arrangement (20a, 20b) of variable orifices having a third left orifice (A2L΄) connected to the main flow path (2) and to a second left connecting point (21) at the left working flow path (9), a third right orifice (A2R΄) connected to the main flow path (2) and to a second right connecting point (22) at the right working flow path (10), a fourth left orifice (A3L΄) connected to the second left connecting point (21) at the left working flow path (9) and to the tank flow path (3), and a fourth right orifice (A3R΄) connected to the second right connecting point (22) at the right working flow path (10) and to the tank flow path (3), wherein the first bridge arrangement (15a, 15b) and the second bridge arrangement (20a, 20b) have different steering characteristics, and by selection means (23) connecting at least one of the bridge arrangements (15a, 15b; 20a, 20b) between the pressure port (P) and the working port arrangement.

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

A hydraulic steering arrangement (1) is described comprising a supply port arrangement having a pressure port (P) and tank port (T), a working port arrangement having two working ports (L, R), a steering unit (2) arranged between the supply port arrangement and the working port arrangement and a steering valve (3) arranged between the supply port arrangement and the working port arrangement. Such a steering arrangement should have a safety means. To this end in a manual steering mode the steering valve (3) is connected to the working port arrangement through the steering unit (2).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 3/14 - Steering gears hydraulic
• B62D 1/22 - Alternative steering-control elements, e.g. for teaching purposes
• B62D 5/32 - Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means for telemotor systems

Abstract

A fluid power system comprises a pump with multiple independently variable outlets, each of which is capable of delivering fluid in individually controllable volume units and a plurality of hydraulic loads. A system of switching valves is configured to create fluid connections between the pump outlets and the loads. A control system commands both the pump and the switching valves, so as to create valve state combinations to satisfy load conditions as demanded by an operator. The number of pump outlets connected to one or more of the loads is changeable to satisfy the flow required of the load due to the operator demand, each pump outlet being commanded to produce a flow depending on the status of other outlets connected a load to which the outlet is connected and the operator demand for that load.

IPC Classes  ?

• F15B 11/17 - Servomotor systems without provision for follow-up action with two or more servomotors using two or more pumps

Abstract

A system, apparatus and method are provided for limiting operating speed at high temperatures of a self-propelled, agricultural product applicator having a hydraulic drive system including a pump supplying pressurized hydraulic fluid to a variable-displacement hydraulic motor operatively connected for propelling the applicator. A temperature sensor detects a temperature of the pressurized hydraulic fluid in the hydraulic system. A propel controller is operatively connected between the temperature sensor and the propulsion motor and configured for limiting displacement of the propulsion motor according to one or more predetermined de-rated conditions resulting in reduced motor speed, in accordance with a predetermined schedule, when predetermined motor de-rating activation temperature limits of the hydraulic fluid are detected by the temperature sensor. The controller is further configured for providing a de-rated condition warning signal prior to limiting displacement of the propulsion motor.

IPC Classes  ?

• F16H 61/42 - Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
• F16H 39/02 - Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motors at a distance from liquid pumps
• F16H 61/47 - Automatic regulation in accordance with output requirements for achieving a target output speed
• A01C 23/00 - Distributing devices specially adapted for liquid manure or other fertilising liquid, including ammonia, e.g. transport tanks or sprinkling wagons
• F16H 59/72 - Inputs being a function of gearing status dependent on oil characteristics, e.g. temperature, viscosity
• A01M 21/04 - Apparatus for destruction by steam, chemicals, burning, or electricity

Abstract

A hydraulic steering arrangement is described comprising a steering unit (1), a steering wheel and a steering wheel angle sensor (3) detecting an angle of rotation between the steering wheel and the steering unit (1). Such a steering arrangement should have a simple construction. To this end the steering wheel angle sensor (3) comprises a transmitter/receiver arrangement fixed to the steering unit (1) and a target assembly (4) which is rotateably fixed to the steering wheel by means of a connection geometry (9) and comprises a passive reaction arrangement.

IPC Classes  ?

• H02K 29/12 - Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils
• B62D 15/02 - Steering position indicators
• G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
• B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle

Abstract

5) and generates a fault signal, if the sum is not within a predetermined range.

IPC Classes  ?

• G01B 7/14 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
• G01B 7/30 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapersMeasuring arrangements characterised by the use of electric or magnetic techniques for testing the alignment of axes
• G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
• G01D 5/244 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trainsMechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means generating pulses or pulse trains
• G01D 5/14 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
• G01D 5/12 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means
• G01D 11/24 - Housings
• B62D 5/04 - Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
• B62D 15/02 - Steering position indicators
• G01B 7/00 - Measuring arrangements characterised by the use of electric or magnetic techniques
• G01B 7/02 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width, or thickness

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (8) connected to a main flow path (2) and a tank port (5) connected to a tank flow path (3), a working port arrangement having a left working port (L) connected to a left working flow path (4) and a right working port (R) connected to a right working flow path (5), a variable first left orifice (A2L) connected to the main flow path (2) and to the left working flow path (4), a variable first right orifice (A2R) connected to the main flow path (2) and to the right working flow path (5), a variable second left orifice (A3L) connected to the left working flow path (4) and to the tank flow path (3), and a variable second right orifice (A3R) connected to the right working flow path (5) and to the tank flow path (3). Such a steering unit should allow comfortable steering. To this end a measuring motor (15) is arranged in one of the working flow parts (4, 5).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (P) connected to a main flow path (2) and a tank port (T) connected to a tank flow path (3), a first working port arrangement having a first left working port (L1) connected to a first left working flow path (4) and a first right working port (R1) connected to a first right working flow path (5), a variable first left orifice (A2L) connected to the main flow path (2) and to the first left working flow path (4), a variable first right orifice (A2R) connected to the main flow path (2) and to the first right working flow path (5), a variable second left orifice (A3L) connected to the first left working flow path (4) and to the tank flow path (3), a variable second right orifice (A3R) connected to the first right working flow path (5) and to the tank flow path (3), and a second working port arrangement having a second left working port (l2) connected to a second left working flow path (9) and a second right working port (R2) connected to a second right working flow path (10), wherein the variable first left orifice (A2L) is connected to the second left working flow path (9) and the variable first right orifice (A2R) is connected to the second right working flow path (10).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 7/15 - Steering linkageStub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering characterised by means varying the ratio between the steering angles of the steered wheels

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (P) connected to a main flow path (2) and a tank port (T) connected to a tank flow path (3), a working port arrangement having a left working port (L) connected to a left working flow path (9) and a right working port (R) connected to a right working flow path (10), a bridge arrangement (15) of variable orifices having a first left orifice (A2L) connected to the main flow path (2) and to a left connecting point (16) at the left working flow path (9), a first right orifice (A2R) connected to the main flow path (2) and to a right connecting point (17) at the right working flow path (10), a second left orifice (A3L) connected to the left connecting point (16) at the left working flow path (9) and to the tank flow path (3), and a second right orifice (A3R) connected to the right connecting point (17) at the right working flow path (10) and to the tank flow path (3). Such a steering unit should allow for a comfortable steering. To this end reverse flow prevention means (20, 21) are arranged in at least one of the left working flow path (9) and the right working flow path (10).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (P) connected to a main flow path (6) and a tank port (T) connected to a tank flow path (7), a working port arrangement having a left working port connected to a left working flow path (8) and a right working port (R) connected to a right working flow path (9), a bridge arrangement (14) of variable orifices (A2L, A2R, A3L, A3R) having a first left orifice (A2L) connected to the main flow path (6) and to the left working flow path (8), a first right orifice (A2R) connected to the main flow path (6) and to the right working flow path (9), a second left orifice (A3L) connected to the left working flow path (8) and to the tank flow path (7), and a second right orifice (A3R) connected to the right working flow path (9) and to the tank flow path (7). Such a steering unit should make steering comfortable. To this end a measuring motor (15) a measuring motor (15) is arranged in one of the left working flow path (8) and the right working flow path (9) and an amplification flow path (16) is connected to the one working flow path (8, 9) downstream the measuring motor (15).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (8) connected to a main flow path (6) and a tank port (T) connected to a tank flow path (7), a working port arrangement having a left working port (L) connected to a left working flow path (9) and a right working port (R) connected to a right working flow path (10), a bridge arrangement (14) of variable orifices having a first left orifice (A2L) connected to the main flow path (6) and to the left working flow path (9), a first right orifice (A2R) connected to the main flow path (6) and to the right working flow path (10), a second left orifice (A3L) connected to the left working flow path (9) and to the tank flow path (7), and a second right orifice (A3R) connected to the right working flow path (10) and to the tank flow path (7). Such a hydraulic steering unit should allow comfortable steering. To this end a measuring motor arrangement is arranged in one of the left working flow path (9) and the right working flow path (10), the measuring motor arrangement (15) having a first measuring motor (1 6) and a second measuring motor (17).

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (P) connected to a main flow path (2) and a tank port (T) connected to a tank flow path (3), a working port arrangement having a left working port (L) connected to a left working flow path (4) and a right working port (R) connected to a right working flow path (5), a bridge arrangement (21) of variable orifices (A2L, A3L, A2R, A3R) having a first left orifice (A2L) connected to the main flow path (2) and to the left working flow path (4), a first right orifice (A3R) connected to the main flow path (2) and to the right working flow path (5), a second left orifice (A3L) connected to the left working flow path (4) and to the tank flow path (3), and a second right orifice (A3R) connected to the right working flow path (5) and to the tank flow path (3). Such a steering unit allows steering a vehicle with low energy consumption. To this end a load sensing port (LS) is provided, the load sensing port (LS) signaling a pressure in the steering unit (1) to the outside.

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

A hydraulic steering unit (1) is described, said hydraulic steering unit (1) comprising a supply port arrangement having a pressure port (P) connected to a main flow path (3) and a tank port (T) connected to a tank flow path (4), a working port arrangement having a left working port (L) connected to a left working flow path (5) and a right working port (R) connected to a right working flow path (6), a bridge arrangement (14) of variable orifices having a first left orifice (A2L) connected to the main flow path (3) and to the left working flow path (5), a first right orifice (A2R) connected to the main flow path (3) and to the right working flow path (6), a second left orifice (A3L) connected to the left working flow path (5) and to the tank flow path (4), and a second right orifice (A3R) connected to the right working flow path (6) and to the tank flow path (4). Such a hydraulic steering unit should be operated together with a pressure source of fixed displacements. To this end an idle flow path (15) branches off the main flow path (3), wherein a variable idle orifice (An) is arranged in the idle flow path (15), the idle orifice (An) being open in neutral position and closing out of neutral position.

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (P) connected to a main flow path (5) and a tank port (T) connected to a tank flow path (6), a working port arrangement having a left working port (L) connected to a left working flow path (7) and a right working port (R) connected to a right working flow path (8), a bridge arrangement (14) of variable neutral open orifices, said bridge arrangement (14) comprising a first left orifice (A2L) connected to a main flow path (5) and to the left working flow path (7), a first right orifice (A2R) connected to a main flow path (5) and to the right working flow path (8), a second left orifice (A3L) connected to the left working flow path (7) and to the tank flow path (6), and a second right orifice (A3R) connected to the right working flow path (8) and to the tank flow path (6). Such a steering unit has a good steering behavior but can function as a closed-center solution. To this end a further variable orifice arrangement is arranged between the supply port (P) arrangement and the working port arrangement (T), which further orifice arrangement is closed in neutral position.

IPC Classes  ?

• B62D 5/093 - Telemotor driven by steering wheel movement

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (8) connected to a main flow path (2) and a tank port (5) connected to a tank flow path (3), a working port arrangement having a left working port (L) connected to a left working flow path (4) and a right working port (R) connected to a right working flow path (5), a variable first left orifice (A2L) connected to the main flow path (2) and to the left working flow path (4), a variable first right orifice (A2R) connected to the main flow path (2) and to the right working flow path (5), a variable second left orifice (A3L) connected to the left working flow path (4) and to the tank flow path (3), and a variable second right orifice (A3R) connected to the right working flow path (5) and to the tank flow path (3). Such a steering unit should allow comfortable steering. To this end a measuring motor (15) is arranged in one of the working flow parts (4, 5).

IPC Classes  ?

• B62D 5/065 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• B62D 5/093 - Telemotor driven by steering wheel movement
• B62D 5/08 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of valve used
• B62D 5/14 - Rotary motor