A control arrangement controls a position of a swashplate in an axial piston pump between a no-stroke position and a maximum stroke position. The control arrangement includes a servo spool mounted for limited sliding movement in a compensator piston cylinder. A solenoid coil is configured to provide a coil force to move the servo spool. A compensator piston is mounted in the compensator piston cylinder in response to movement of the servo spool. A spring between the servo spool and the compensator piston provides a spring force in response to the coil force applied to the servo spool. The control arrangement defines a feedback system configured to maintain a balancing relationship between the spring and coil forces to enable infinite control of the swashplate position.
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
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 1/324 - 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
2.
ELECTRO-HYDRAULIC SWASHPLATE CONTROL ARRANGEMENT FOR AN AXIAL PISTON PUMP
A control arrangement controls a position of a swashplate (52) in an axial piston pump between a no-stroke position and a maximum stroke position. The control arrangement includes a servo spool (84) mounted for limited sliding movement in a compensator piston cylinder (70). A solenoid coil (94) is configured to provide a coil force to move the servo spool (84). A compensator piston (100) is mounted in the compensator piston cylinder (70) in response to movement of the servo spool (84). A spring (102) between the servo spool (84) and the compensator piston (100) provides a spring force in response to the coil force applied to the servo spool (84). The control arrangement defines a feedback system configured to maintain a balancing relationship between the spring (102) and coil (94) forces to enable infinite control of the swashplate position.
A multiple action forced fluid evacuation system includes a reservoir for receiving a working fluid therein, and a shutoff valve provided in the reservoir. An outer rigid conduit and an inner flexible conduit are connected between the shutoff valve and a receiver. A processing module is provided for at least controlling pressurized gas between the outer conduit and the inner conduit, and is operatively connected to the outer conduit and the inner conduit. A nozzle has one end in fluid communication with a source of the working fluid, and an opposite end removably coupled to the receiver. The nozzle normally enables flow of the working fluid through the inner conduit to the reservoir when the nozzle is connected to the receiver until the working fluid in the reservoir activates the shutoff valve causing the nozzle to cease flow of the working fluid leaving a portion of the working fluid trapped in the receiver and the inner conduit. Removal of the nozzle from the receiver activates the processing module and causes the portion of the working fluid trapped in the inner conduit and the receiver to be completely and sequentially evacuated into the reservoir.
F16K 7/07 - Diaphragm cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage with tubular diaphragm constrictable by external radial force by means of fluid pressure
F16L 55/07 - Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
An axial piston pump includes a housing with a cover plate assembly, a rotor with reciprocable pistons rotatably mounted with a drive shaft and a swashplate assembly tiltably mounted relative to the drive shaft and engaged with outer ends of the pistons. A holddown spring is incorporated within the swashplate assembly and positioned outside the rotor such that the holddown spring tilts with the swashplate assembly and does not rotate with the drive shaft. The holddown spring applies a force holding the piston outer ends against the swashplate assembly and the rotor against the cover plate assembly.
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 1/12 - 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 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
A fluid conduit arrangement includes a reservoir containing a pressurized gas therein. An outer rigid conduit in communication with the reservoir contains a first working fluid under pressure from the pressurized gas within a closed system defined by the reservoir and the outer rigid conduit. An inner flexible conduit is provided for conducting a second working fluid therethrough upon application of a supply pressure. The inner flexible conduit is disposed within the outer rigid conduit, and is subjected to the pressurized first working fluid in surrounding relationship therewith. Relative differences between the pressurized first working fluid and the second working fluid enable the inner flexible conduit to either expand and permit free flow of the second working fluid therethrough, or collapse and evacuate flow of the second working fluid therefrom.
F16K 7/07 - Diaphragm cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage with tubular diaphragm constrictable by external radial force by means of fluid pressure
F01N 3/20 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operationControl specially adapted for catalytic conversion
F16L 55/07 - Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
F16L 55/10 - Means for stopping flow in pipes or hoses
A fluid conduit arrangement (10) includes a reservoir (12) containing a pressurized gas (14) therein. An outer rigid conduit (16) in communication with the reservoir (12) contains a first working fluid under pressure from the pressurized gas within a closed system defined by the reservoir (12) and the outer rigid conduit (16). An inner flexible conduit (18) is provided for conducting a second working fluid therethrough upon application of a supply pressure. The inner flexible conduit (18) is disposed within the outer rigid conduit (16), and is subjected to the pressurized first working fluid in surrounding relationship therewith. Relative differences between the pressurized first working fluid and the second working fluid enable the inner flexible conduit (18) to either expand and permit free flow of the second working fluid therethrough, or collapse and evacuate flow of the second working fluid therefrom.
F01N 3/20 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operationControl specially adapted for catalytic conversion
F16L 55/07 - Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
F16K 7/07 - Diaphragm cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage with tubular diaphragm constrictable by external radial force by means of fluid pressure
patents
