Abstract

The present invention provides a hydraulic circuit system and a pump device that use a tandem pump, in which two hydraulic pumps capable of independently controlling the flow rates of multiple discharge ports are disposed, and a plurality of switching valves, wherein operability is improved, and mounting characteristics are enhanced by miniaturizing the pump device and reducing the number of hydraulic hoses. To this end, first and second hydraulic pumps 11, 12, which incorporate four pump elements 11a-11d, 12a-12d capable of independently controlling the flow rates of pressurized oil discharged from discharge ports 45a-45d, 46a-46d and are arranged in tandem along the axial direction of a shaft 14 so as to form a tandem pump 30, are such that the discharge ports 45a-45d, 46a-46d are opened in a block surface 13S of a port block 13, which is a shared component, and a manifold block 40, in which switching valves 41a-41d, 42a-42d are mounted and service ports 43, 44 are formed, is coupled to the block surface 13S.

IPC Classes  ?

• F15B 11/17 - Servomotor systems without provision for follow-up action with two or more servomotors using two or more pumps
• E02F 9/22 - Hydraulic or pneumatic drives
• F15B 11/00 - Servomotor systems without provision for follow-up action

Abstract

A hydraulic machine assembly (8), comprises: a first hydraulic machine (10) comprising a first set of machine modules (56) arranged around a first machine shaft (12), each machine module (56) of the first set comprising a group of fluidly-coupled piston assemblies (18) in driving engagement with a first set of cams (16) carried by the first machine shaft (12); and a second hydraulic machine (10) comprising a second set of machine modules (56) arranged around a second machine shaft (12), each machine module (56) of the second set comprising a group of fluidly-coupled piston assemblies (18) in driving engagement with a second set of cams (16) carried by the second machine shaft (12) Rotation of the second machine shaft (12) is coupled to rotation of the first machine shaft (12). The first set of cams (16) are angularly offset relative to the second set of cams (16), and respective angular orientations of the cams (16) of the first set of cams (16) are interleaved with respective angular orientations of the cams (16) of the second set of cams (16). The phase of each piston assembly (18) is unique, so that all of the piston assemblies (18) of the machine assembly (8) are out-of-phase, the respective phases of the piston assemblies (18) of the machine assembly (8) being evenly spaced.

IPC Classes  ?

• F03C 1/30 - Cams specially adapted therefor
• F03C 1/053 - Reciprocating-piston liquid engines with multiple cylinders, characterised by the number or arrangement of cylinders with cylinders in star- or fan-arrangement the pistons co-operating with an actuated element at the inner ends of the cylinders
• F04B 1/0413 - Cams
• F04B 1/0536 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with two or more serially arranged radial piston-cylinder units
• 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

Abstract

The present invention relates to a switching valve block for a hydraulically actuable work machine that comprises a plurality of valve block inputs for a respective connection to a pressure output of one or more hydraulic fluid pumps, a plurality of valve block outputs for outputting a pressurized hydraulic fluid, and at least one valve that is arranged between valve block inputs and valve block outputs and is adapted to selectively produce a fluid connection between a first valve block input and a first valve block output or between a first valve block input and a second valve block output. The invention is characterized in that the first valve block output furthermore already has a fixed fluid connection to a second valve block input.

IPC Classes  ?

• F15B 11/17 - Servomotor systems without provision for follow-up action with two or more servomotors using two or more pumps
• E02F 3/42 - Drives for dippers, buckets, dipper-arms or bucket-arms
• E02F 9/22 - Hydraulic or pneumatic drives
• F15B 13/06 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors

Abstract

A vehicle includes: a prime mover; a hydraulic fluid manifold; a hydraulic machine; a hydraulic accumulator; one or more hydraulic actuators; a valve arrangement; and a controller. The controller is configured to receive an actuator demand signal indicative of a demand to move the one or more hydraulic actuators; and to control the hydraulic machine and the valve arrangement to cause movement of the one or more actuators in accordance with the actuator demand signal by bringing the hydraulic accumulator into fluid communication with a first actuator chamber of the one or more hydraulic actuators, and to synchronise therewith changing a pressure in a second actuator chamber of the one or more hydraulic actuators. The second actuator chamber is in fluid communication with the hydraulic machine.

IPC Classes  ?

• E02F 9/22 - Hydraulic or pneumatic drives
• F15B 1/02 - Installations or systems with accumulators
• F15B 1/033 - Installations or systems with accumulators having accumulator charging devices with electrical control means
• F15B 11/024 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
• F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors
• F15B 11/17 - Servomotor systems without provision for follow-up action with two or more servomotors using two or more pumps
• F15B 21/14 - Energy-recuperation means

Abstract

The present invention provides a controller for a hydraulic apparatus. The controller is configured to determine (410) that a mode change criteria has been met for the hydraulic apparatus. In response to the determination, the controller is configured to control (420) a valve arrangement to change a first actuator chamber of a hydraulic actuator between being fluidly connected to a hydraulic machine and fluidly isolated from a second chamber of the hydraulic actuator, and being fluidly connected to both the second actuator chamber and the hydraulic machine. Further in response to the determination, the controller is configured to control (430) the hydraulic machine to change a flow rate of hydraulic fluid flowing through the hydraulic machine to regulate a movement of the hydraulic actuator during the control of the valve arrangement.

IPC Classes  ?

• F15B 11/024 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
• F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors
• F15B 11/00 - Servomotor systems without provision for follow-up action
• F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
• F15B 15/20 - Other details
• F15B 21/08 - Servomotor systems incorporating electrically- operated control means
• F15B 13/06 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
• E02F 9/22 - Hydraulic or pneumatic drives
• E02F 3/42 - Drives for dippers, buckets, dipper-arms or bucket-arms

Abstract

A hydraulic transmission (1) connected to a prime mover (2), and comprising an input shaft (A), a first hydraulic machine (4), a second hydraulic machine (6), each of the hydraulic machines comprising a plurality of working chambers having a volume which varies cyclically with rotation of a respective rotatable shaft, a hydraulic circuit (14, 34, 47, 48) extending between a group of one or more working chambers of the first hydraulic machine and the second hydraulic machine, each working chamber of each hydraulic machine comprising a low-pressure valve which regulates the flow of hydraulic fluid between the working chamber and a low-pressure manifold and a high-pressure valve which regulates the flow of hydraulic fluid between the working chamber and a high-pressure manifold, each hydraulic machine being configured to actively control at least the low-pressure valves of the group of one or more working chambers to select the net displacement of hydraulic fluid by each working chamber on each cycle of working chamber volume, and thereby the net displacement of hydraulic fluid by the group of one or more working chambers, responsive to a demand signal. In such a hydraulic transmission it should be possible to recover energy. To this end a rotatable shaft of the first hydraulic machine (4) or the input shaft (A) is in driven engagement with a first input/output shaft of a speed/torque summing assembly (5), a rotatable shaft of the second hydraulic machine (6) is in driven engagement with a second input/output shaft of the speed/torque summing assembly (5), and the output shaft (7) is in driven engagement with a third input/output shaft of the speed/torque summing assembly (5).

IPC Classes  ?

• F16H 47/04 - Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the mechanical gearing being of the type with members having orbital motion
• F03C 1/40 - Control specially adapted therefor
• F04B 49/06 - Control using electricity
• F16H 61/4096 - Fluid exchange between hydrostatic circuits and external sources or consumers with pressure accumulators
• F16H 61/4148 - Open loop circuits
• F16H 61/421 - Motor capacity control by electro-hydraulic control means, e.g. using solenoid valves
• F16H 61/431 - Pump capacity control by electro-hydraulic control means, e.g. using solenoid valve

Abstract

A hydraulic apparatus provided with an eccentric (32) rotatable about an axis, a plurality of piston feet (154) arranged around a running surface of the eccentric, wherein each piston foot is configured to reciprocate by rotation of the eccentric. The hydraulic apparatus is further provided a retention ring (100a; 100b) having an inner surface (102) which defines therein at least one depression (104), an outer surface (106) defined by the outer circumference of the retention ring; and first and second lateral surfaces (110, 108) each extending between the inner surface and the outer surface. The piston feet each have a seat portion (164) and a lateral flange (162), and at least two of the piston feet (154) have a protrusion (166) that is sized and shaped in relation to the size and shape of the depression (104), such that the protrusion can move from the first lateral surface (110) of the retention ring towards the second lateral surface (108) of the retention ring, via the depression, when the protrusion is in a first position with respect to the depression, such that the retention ring then surrounds both the lateral flange and the eccentric.

IPC Classes  ?

• F04B 1/053 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
• F04B 1/0426 - Arrangements for pressing the pistons against the actuated camArrangements for connecting the pistons to the actuated cam
• F03C 1/053 - Reciprocating-piston liquid engines with multiple cylinders, characterised by the number or arrangement of cylinders with cylinders in star- or fan-arrangement the pistons co-operating with an actuated element at the inner ends of the cylinders
• F03C 1/04 - Reciprocating-piston liquid engines with multiple cylinders, characterised by the number or arrangement of cylinders with cylinders in star- or fan-arrangement

Abstract

A hydraulic transmission (1) is described comprising a housing (24, 27, 28, 30), an output shaft (17), a first hydraulic machine (6) comprising a main shaft (2) having an input section (3), a second hydraulic machine (18), and a speed/torque summing assembly (11), wherein the first hydraulic machine (6) is torque connected to a first input of the speed/torque summing assembly (11) and the second hydraulic machine is torque connected to a second input of the speed/torque summing assembly (11), and the output shaft (17) is connected to an output (16) of the speed/torque summing assembly (11). Such a hydraulic transmission should be made compact. To this end, the first hydraulic machine (6) and the second hydraulic machine (18) are located between the input section (3) and the speed/torque summing assembly (11).

IPC Classes  ?

• F16H 39/16 - Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type each with one main shaft and provided with pistons reciprocating in cylinders with cylinders arranged perpendicular to the main axis of the gearing
• F16H 47/04 - Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the mechanical gearing being of the type with members having orbital motion
• F16H 61/42 - Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity

Abstract

A hydraulic transmission (1) comprises a prime mover (2), a first hydraulic displacement machine (3), a speed/torque summing assembly (4), a second hydraulic displacement machine (5), and driven elements (6) is described, wherein the first hydraulic displacement machine (3) or the prime mover (2) is connected to a third input/output of the speed/torque summing assembly (4), the second hydraulic displacement machine (5) is connected to a second input/output of the speed/torque summing assembly (4) and the driven elements (6) are connected to a third input/output of the speed/torque summing assembly (4). The possibilities of operation of such a hydraulic transmission should be increased. To this end, the first hydraulic machine (3) is an electronically commutated machine controlled by a controller (51), and the second hydraulic machine (5) is a machine with fixed commutation.

IPC Classes  ?

• F16H 61/4096 - Fluid exchange between hydrostatic circuits and external sources or consumers with pressure accumulators
• F16H 61/4148 - Open loop circuits
• F16H 61/431 - Pump capacity control by electro-hydraulic control means, e.g. using solenoid valve

Abstract

There is provided a controller (320) for a hydraulic machine (310), the hydraulic machine (310) in a hydraulic circuit including a hydraulic actuator, having a rotatable shaft in driven engagement with a prime mover, and defining a plurality of working chambers in the hydraulic circuit, each working chamber being defined partially by a movable working surface mechanically coupled to the rotatable shaft, such that, in operation, the hydraulic machine (310) exchanges energy with the hydraulic circuit and the prime mover by movement of the working surfaces and the rotatable shaft. The controller (320) is configured to: receive a movement input signal indicative of a demand to move the hydraulic actuator; determine a hydraulic machine control signal depending on the movement input signal and a fluctuation input signal; and control the hydraulic machine (310) to exchange hydraulic fluid with the hydraulic circuit in accordance with the hydraulic machine control signal to cause movement of the hydraulic actuator in accordance with the movement input signal and the fluctuation input signal.

IPC Classes  ?

• E02F 9/22 - Hydraulic or pneumatic drives
• F04B 49/06 - Control using electricity
• F15B 21/08 - Servomotor systems incorporating electrically- operated control means

Abstract

The invention relates to a hydraulic system for a hydraulically actuatable working machine, comprising a switch valve block with multiple valve block inlets for connecting to a respective pressure outlet of one or more hydraulic fluid pump(s), multiple valve block outlets for discharging a pressurized hydraulic fluid, and at least one valve which is arranged between the valve block inlets and the valve block outlets and is designed to produce a fluidic connection selectively between a first valve block inlet and a first valve block outlet or between the first valve block inlet and a second valve block outlet. The hydraulic system also comprises multiple pressure sources, preferably multiple pressure sources which can be actuated separately, each pressure source being connected to a respective valve block inlet, and multiple hydraulic loads, each of which is connected to a respective valve block outlet. The system is characterized in that the first valve block outlet additionally already has a permanent fluidic connection to a second valve block inlet, preferably a permanent exclusive fluidic connection, and the steering mechanism is connected to the first valve block outlet.

IPC Classes  ?

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

Abstract

The invention relates to a switch valve block for a hydraulically actuatable working machine, comprising multiple valve block inlets for connecting to a respective pressure outlet of one or more hydraulic fluid pump(s), multiple valve block outlets for discharging a pressurized hydraulic fluid, and at least one valve which is arranged between the valve block inlets and the valve block outlets and is designed to produce a fluidic connection selectively between a first valve block inlet and a first valve block outlet or between a first valve block inlet and a second valve block outlet. The invention is characterized in that the first valve block outlet additionally already has a permanent fluidic connection to a second valve block inlet.

IPC Classes  ?

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