Abstract: Axial piston compressor, especially a compressor for motor vehicle air-conditioning systems, having at least one piston and having a tilt plate, especially a ring-shaped tilt plate, which is variable in terms of its inclination with respect to a drive shaft and which is driven in rotation by the drive shaft and is connected to—especially in articulated connection with—at least one supporting element arranged at a spacing from the drive shaft and rotating together therewith, the piston(s) having in each case an articulated arrangement with which the tilt plate is in sliding engagement, and the supporting element being in operative engagement with a force transmission element which rotates together with the drive shaft, wherein the supporting element is in articulated connection with the force transmission element so as to be displaceable in a radial direction and/or perpendicular thereto, especially perpendicular to the drive shaft axis.

Abstract: An object of the invention is to provide a swash plate compressor capable of realizing an excellent sliding characteristic when a drive shaft is rotated at high speed, and a high refrigerating capacity when the drive shaft is rotated at low speed. The swash plate compressor according to the invention comprises an release passage for communication between a crank chamber and a suction chamber. The release passage includes a first passage communicated to an oil rich region, in which lubricating oil is large in quantity, in the crank chamber, and a second passage communicated to an oil poor region, in which lubricating oil is small in quantity, in the crank chamber. Also, the swash plate compressor comprises an valve mechanism that increases an opening ratio of the first passage with respect to the release passage, as a rotational speed of a drive shaft increases, and increases an opening ratio of the second passage with respect to the release passage, as the rotational speed of the drive shaft decreases.

Abstract: The invention has its object to provide a swash plate compressor capable of realizing demonstration of an excellent sliding characteristic when a drive shaft is rotated at high speed, and of a high refrigerating capacity when the drive shaft is rotated at low speed. With the swash plate compressor of the invention, an oil guide groove, an oil guide hole, a first hole, an outflow hole, a valve hole, a communication port, a receiving chamber, a throttle hole, and a second hole constitute a release passage. The oil guide groove, the oil guide hole, the first hole, the outflow hole, the valve hole, the communication port, the receiving chamber, and the throttle hole constitute a first passage. Also, the second hole constitute a second passage. A valve mechanism increases a ratio, at which the first passage occupies the release passage, as a drive shaft is increased in rotating speed.

Abstract: The variable capacity compressor has a rotor 21, as a rotating member, fixed to a drive shaft 10 and rotating integrally with the drive shaft 10, a swash plate 24, as a tilting member, tiltably and slidably attached to the drive shaft 10, a linkage mechanism 40 linking the rotor 21 and the swash plate 24 at a position corresponding to an upper dead center of the swash plate 24, transferring rotation of the rotor 21 to the swash plate 24, and guiding the tilting movement of the swash plate 24, and a tilting movement guide 60 provided between the rotor 21 and the swash plate 24 and anterior to the linkage mechanism 40 in the rotating direction and guiding changes of the inclination angle of the swash plate 24 with respect to the drive shaft 10.

Abstract: A tilting plate type compressor includes: cylinder bores; a crank chamber; a drive shaft rotatably supported by a bearing provided within a bearing cavity; a tilting plate provided within the crank chamber and capable of swingably rotating due to a rotation of the drive shaft; and pistons capable of reciprocating within the cylinder bores due to swingably rotating of the tilting plate; an extraction path communicating between the crank chamber and a suction chamber; and an intake path communicating between the crank chamber and a discharge chamber. The extraction path includes an intra-axis path provided within the drive shaft and opens into the bearing cavity. The intake path opens into the bearing cavity and communicates with the crank chamber via the bearing cavity. According to the compressor, it can be prevented much as possible that oil leaks from the crank chamber through the extraction path.

Abstract: A variable displacement compressor including a drive shaft through which a gas passage extends between front and rear ends of the drive shaft. The gas passage is connected to a suction chamber at the rear end of the drive shaft. The drive shaft includes a first gas inlet passage, which connects the gas passage to a crank chamber through a lip seal, an oil chamber, and a thrust bearing, and a second gas inlet passage, which connects the gas passage to a central portion of the crank chamber. The drive shaft further includes a sleeve movable along the drive shaft as a swash plate inclines to adjust an open amount of the second gas inlet passage in accordance with the inclination angle of the swash plate, that is, the displacement of the compressor.

Abstract: A variable displacement compressor includes a housing, a rotary shaft, a swash plate, a suction pressure region, a suction throttle valve, an oil reservoir, a lubricating oil passage, a gas flow passage, a communication passage, and a throttle mechanism. The suction-pressure region includes a suction chamber and a suction passage. The suction throttle valve is arranged in the suction passage and defines an upstream suction-pressure region and a downstream suction-pressure region. The lubricating oil passage connects the oil reservoir to the upstream suction-pressure region. The gas flow passage connects the crank chamber to the suction chamber. The communication passage connects the lubricating oil passage to at least one of the downstream suction-pressure region, the gas flow passage and the crank chamber. The throttle mechanism is provided in the lubricating oil passage between the oil reservoir and a position where the communication passage connects to the lubricating oil passage.

Abstract: Axial piston compressor, especially a compressor for the air-conditioning system of a motor vehicle, having a housing and, for drawing in and compressing a coolant, a compressor unit arranged in the housing and driven by means of a drive shaft, the compressor unit comprising pistons, which move axially back and forth in a cylinder block, and a tilt plate (swash plate, wobble plate or tilt ring) which drives the pistons and rotates together with the drive shaft, wherein the tilt plate is so constructed or mounted that its tilting behaviour acts in a self-limiting manner such that at high speeds of rotation of the compressor, especially at very high speeds of rotation or at the maximum speed of rotation, the angle of maximum deflection of the tilt plate is less than the angle of maximum deflection ?max at low speeds of rotation of the compressor.

Abstract: A system and method is provided for controlling a variable displacement piston pump that supplies fluid to one or more loads. If fluid is being supplied through a metering valve to a load, then the variable displacement piston pump is controlled to operate in accordance with a variable flow/variable discharge pressure scheme. However, if fluid is not being supplied through the metering valve to the load, then the variable displacement piston pump is controlled to operate in accordance with a variable flow/constant discharge pressure scheme.

Abstract: An axial piston hydraulic device. The device has a housing that uses a servo piston in order to control the displacement of a swashplate within the device. By using a servo member disposed within a cavity of an end cap on the housing the axial piston hydraulic device is able to provide three operating positions depending on the angle of the swashplate.

Abstract: An axial plunger pump or motor comprises a casing (1), a main shaft (2), a rotor cylinder (14), a rotary swash plate (9) and a plurality of plunger assemblies (10), wherein a constant velocity universal coupling (11) transmits torque between the rotary swash plate and the main shaft, such that the main shaft (14) and the rotary swash plate (9) rotate about the main shaft axis (41) and the swash plate axis (91) forming an angle therebetween, respectively, so as to realize transition between hydraulic energy and rotary mechanical energy.

Abstract: A linkage mechanism (40) of a variable displacement compressor includes an arm (41) extending from a rotating member (21) toward a tilting member (24), an arm (43) extending from the tilting member (24) toward the rotating member (21) and receiving rotary torque from the arm (41) of the rotating member, a pin (51) fixed to one of the arm (41) of the rotating member and the arm (43) of the tilting member, and an axial direction load receiving face (53) formed on the other of the arm (41) of the rotating member and the arm (43) of the tilting member and configured to contact with the pin (51) to receive axial a direction load applied between the rotating member (21) and the tilting member (24).

Abstract: A variable displacement compressor including a rotary shaft, a swash plate, and a rotary support is disclosed. An inclination angle of the swash plate is changed so that the displacement of the compressor is controlled. The rotary support has a first balance weight and an arm. The swash plate has a second balance weight and a support bracket. At least one of the first balance weight, the second balance weight, the arm, and the support bracket has a slope on a leading side in the rotation direction of the rotary shaft. The slope has a leading end. The slope is shaped to descend in the direction of the rotation axis toward the leading end.

Abstract: An axial piston machine includes two cylinder drums which are guided in a housing, can be respectively rotated about a drum axis, and are respectively supported on an inclined surface arranged in the direction of a shaft rotational axis. The inclined surfaces are located in the region between the two cylinder drums and the channels for supplying and releasing pressure end in the two inclined surfaces, i.e. pressure is supplied and released centrally.

Abstract: Compressor, especially a compressor for the air-conditioning system of a motor vehicle, having a housing (1) and, for drawing in and compressing a coolant, a compressor unit arranged in the housing (1) and driven by means of a drive shaft, the compressor unit being regulated by means of the pressure (PC) prevailing in a drive mechanism chamber substantially bounded by the housing (1), there being an additional regulation device (17) and/or control device for the inlet-gas-side coolant mass flow and/or the inlet pressure and/or the inlet density.

Abstract: A rotary valve for switching supply passages, and discharge passages of high-temperature and high-pressure steam for a rotor rotatably supported at a casing is constructed by making a fixed side valve plate and a movable side valve plate abut to each other on a slide surface. A pressure chamber into which the high-temperature and high-pressure steam is introduced from the supply passage is opened to a mating surface of a valve body portion with the fixed side valve plate. The fixed side valve plate supported to float is pressed against the movable side valve plate with a pressing load generating in the pressure chamber to bring it into close contact with the slide surface. Leakage of the high-temperature and high-pressure steam from the pressure chamber is prevented by placing a V-packing inside the pressure chamber.

Abstract: A piston assembly for a hydraulic machine is formed with a part spherical cavity in the piston to receive a spherical bearing of a slipper assembly. The spherical bearing is secured in the cavity by swaging the walls of the piston and subsequently working the wall to provide a clearance to allow relative rotation.

Abstract: The invention provides a compressor with a shut off valve disposed between the crank case and the suction cavity. The valve is moveable between an open and closed position in response to the pressure in the discharge cavity of the compressor. The valve is an on/off valve and is operable rapidly depressurize the interior of the crank case when the compressor transitions from a minimum stroke. The valve can define first and second fluid pathways. The first fluid pathway can be larger than the second fluid pathway and be selectively opened and closed. The second fluid pathway can be permanently open and act as a bleed between the crank case and the suction cavity.

Abstract: A fail-safe system for a hybrid vehicle employing an over-center variable-displacement hydraulic motor includes an actuator configured to stroke the motor to a zero angle if each of two control ports is supplied with fluid at an equal pressure. A control valve is configured, in the event of loss of power to the valve, to default to a position in which high-pressure fluid is supplied to both control ports. A pilot-controlled check valve is coupled between high- and low-pressure ports of the motor such that, during normal operation, passage of fluid through the check valve from the high-pressure port to the low-pressure port is checked, while passage of fluid through the check valve from the second port to the first port is enabled. When the pilot control is activated, passage of fluid in the opposite direction is also enabled.

Abstract: Spring barrel pump characterized by the fact that the bores (2) in which the pistons (4) move are provided by way of the spring barrel (1) diametrically to its axis (XX).

Abstract: In a variable displacement swash plate type refrigerant compressor (10), a stopper (28) is provided for setting an initial angle of the inclination angle of a swash plate (23) when a drive shaft (19) is not driven. When the drive shaft (19) is driven by a driving power source of the compressor (10) under a non-operation condition of a refrigerant circuit, the stopper (28) is moved to permit the inclination angle of the swash plate (23) to be reduced from the initial angle in response to increase of compression work of the compressor (10) so as to suppress the increase of the compression work to save the driving power for the compressor (10).

Abstract: A manual hydraulic pump includes a cylinder block 10 and an end block 8. The rear end of the cylinder block 10 and the end block 8 defines an end space 21 between them. The cylinder block 10 has cylinders 13 and oil passages 23. Each oil passage 23 extends between the rear end of one of the cylinders 13 and the end space 21. The end block 8 has a pair of cylindrical holes 27 opening into the end space 21. The end block 8 also has a pair of inlet/outlet ports 25 each communicating with the outside of the pump and one of the cylindrical holes 27. A distributing valve 22 is put in the end space 21 and spring-biased into compressive contact with the rear end of the cylinder block 10. The distributing valve 22 substantially takes the form of a disc and has a thickness smaller than the distance between the adjacent ends of the blocks 10 and 8. The distributing valve 22 has a pair of arcuate ports 22a formed on its front side.

Abstract: When a hybrid compressor starts being driven by an electric motor, the electric current of a capacity control valve is applied at an initial control electric current SS that is greater than a control electric current S, which is from the state of a refrigerating circuit. This triggers a swash plate of the hybrid compressor to be rapidly inclined. Thereafter, the electric current of the displacement control valve is applied at the control electric current S. This structure enables the displacement of the hybrid compressor to rapidly recover when the hybrid compressor starts being driven by the electric motor.

Abstract: A multi-cylinder compressor includes a valve plate having a plurality of cylinder suction ports formed therethrough, and a plurality of cylinder bores centered on an arc having a radius (R). The cylinder bores are substantially equally spaced from each other, and have a diameter (D). The compressor also includes a suction chamber having a substantially annular shape and adapted to be in fluid communication with each of the cylinder bores via the suction ports. Moreover, a center of a first of the suction ports is radially offset in a predetermined direction from a center of a predetermined suction port by a first angle, in which the predetermined suction port has a diameter (d), and the first angle equals {[(360°/N)·([N?1]?n)]+X°}.

Abstract: A saddle bearing liner (30) for a variable displacement axial piston pump (10) includes two axially-spaced apart bearing surfaces (62, 64) with an offset central section (54) integrally joining them. A hollow projection (80) extends radially from the convex side of the pressure bearing section (50) and is received with a recess (82) of the housing (12) to locate the liner (30). The liner (30) has radially extending ledges (70, 72) which mate with surfaces (74, 76) of the housing (12) to inhibit skewing of the bearing liner (30) relative to the axis of the bearing surfaces (62, 64). The projection (80) is hollow and opens to the bearing surface (62) so that presurrized fluid from the housing (12) can be injected between the bearing surface (62) and the mating surface (22) of the swashblock (20). The projection (80) also prevents the liner (30) from rotating about the bearing surface axis.

Abstract: An assembly includes a piston and a transition arm coupled to the piston. The position of the transition arm is adjustable to vary a stroke of the piston. A balance member is adjustable relative to the transition arm to counterbalance the transition arm in varying positions. A control rod is coupled to the transition arm and the balance member. Linear movement of the control rod moves the transition arm in a first direction to change the stroke of the piston and moves the balance member in a second direction substantially opposite the first direction to counterbalance the transition arm. A method of counterbalancing a variable stroke assembly includes moving a transition arm coupled to a piston to vary a stroke of the piston, and moving a balance member in a direction substantially opposite to the direction of movement of the transition arm to counterbalance the transition arm.

Abstract: In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, comprising a machine shaft rotatably supported in a housing with a plurality of pistons arranged circularly around the machine shaft and an annular pivoting disc extending around, and being driven by, the machine shaft, wherein the annular pivoting disc engages the pistons via a joint arrangement disposed on a driver extending from the shaft for transmitting shaft drive forces to the pistons, the annular pivoting disc being supported by a sliding body mounted on a shaft and being pivotable about a hinge axis oriented transversely to the machine shaft, the joint arrangement of the driver is located outside a main center-plane, which extends perpendicularly to the hinge axis and through the axis of rotation of the machine shaft.

Abstract: A torque control for a hydrostatic piston pump that provides for a servo piston rod that is connected to the swashplate of the pump and connected to a servo piston within a first cavity that receives compensation pressure that urges the servo piston toward the swashplate. The servo piston has a stem that extends into a bore and is in contact with the stem of a maximum displacement piston that extends into a second cavity that is acted upon by system pressure to urge the maximum displacement piston toward the swashplate. Additionally, within the second cavity is a set of Bellville washers that surround the stem of the maximum displacement piston to limit the movement of the maximum displacement piston toward the swashplate.

Abstract: A fuel injection control unit, including an electronic governor and a controller for an engine performs control in a governor region based on an isochronous characteristic. A working machine controller receives a delivery pressure signal P and controls a regulator such that, when the delivery pressure of a hydraulic pump exceeds a predetermined pressure P1, the displacement of the hydraulic pump does not exceed a value decided in accordance with a preset pump absorption torque curve. The working machine controller controls the regulator such that, when the delivery pressure of the hydraulic pump 2 is not higher than the predetermined pressure P1, the displacement of the hydraulic pump is increased as the delivery pressure of the hydraulic pump lowers from the predetermined pressure P1.

Abstract: A medium pump for a motor includes a pump case with a pump cylinder and a pump piston positioned displacaebly in the pump cylinder in the direction of a pump axle. The pump piston rotates about the pump axle by running off an oblique control surface and realizes axial pump movements against the pressure of a first spring. A pump lift adjusting device is removably positioned in a guide placed transversely to the pump axle and fixedly connected with the pump case.

Abstract: A compressor, in particular for air conditioning systems in motor vehicles, having a housing, a housing sealing cover, a drive shaft with bearings and a drive device for pistons that are displaced back and forth. The drive device transfers the rotational displacement of the drive shaft into the back-and-forth displacement of the pistons. The compressor also includes a cylinder block, in which the pistons that are displaced back and forth take in and compress coolant, a valve device, in addition to a valve plate with intake and discharge valves comprising intake and discharge chambers for an intake pressure zone and a discharge pressure zone. A cylinder head may be a separate element from the housing, in pot-shaped form, or the housing sealing cover. The intake and discharge chambers, the valve device, and the cylinder block may be situated in the closed side of the pot-shaped housing.

Abstract: A variable displacement compressor includes a plate having a variable inclination angle, and a piston engaging the plate. The piston reciprocates within a bore of the compressor in accordance with a rotation of the plate, and the piston has a stroke length which is determined by the inclination angle of the plate. The compressor also includes a sensor positioned adjacent to the piston. The sensor generates an output signal when a predetermined portion of the piston is aligned with the sensor. The compressor also includes a processing unit operationally coupled to the sensor. The processing unit estimates the inclination angle of the plate based on the output signal from the sensor.

Abstract: The invention relates to an axial piston drive with a continuously adjustable piston stroke, which comprises a drive shaft (10, 12) on which a swash plate (16) is supported in a crank chamber (14) in such a way as to be tiltable and displaceable in the axial direction, as well as a controller (18, 20) by means of which an tilt angle and an axial position of the swash plate (16) can be adjusted, and at least one piston (26, 28) connected to the swash plate (16) so that it can be actuated to move within a cylinder (22, 24).

Abstract: According to the invention, a compressor having a threaded screw connection portion formed directly on a fitting portion of the housing is provided. Since no through bolt or the like for connecting two-parts of the housing is used, the diameter of the housing can be reduced. However, in a case that a suction port and discharge port do not align with an external mounting structure, a mounting means able to slide on the housing and adjust the positions of mounting brackets at least in the direction of rotation is added.

Abstract: A housing for a hydraulic pump is provided. The pump has an input shaft connected to a swashplate, a plurality of pistons, a plurality of check valves, and a metering device having an actuator. The housing includes a first housing member having a fluid inlet, a shaft bore adapted to receive the input shaft, and a swashplate bore adapted to receive the swashplate. A second housing member has a plurality of cylinders adapted to slidably receive the plurality of pistons and a plurality of check valve bores that are in fluid communication with the cylinders and are adapted to receive the plurality of check valves. The second housing member also includes an actuator bore configured to receive at least a portion of the actuator, a collector cavity in fluid communication with each of the check valve bores, and a fluid outlet in fluid communication with the collector cavity.

Abstract: A metering pump includes an actuating mechanism, and a plurality of piston cylinders coupled to the actuating mechanism. A first of the cylinders has a working volume that differs from a second of the cylinders. The actuating member is centrally located and the cylinders are arranged radially about the actuating mechanism. The working volume of the cylinders can be varied by adjusting the spacing of the cylinders from the actuating mechanism, thus varying the stroke of pistons housed within the cylinders, and/or by providing the cylinders with different inner diameters. A method of metering fluids includes independently adjusting stroke of a plurality of pistons to adjust the volume of metered fluid, and selecting different cylinder diameters to adjust the volume of metered fluid.

Abstract: The invention relates to a multi-cylinder high-pressure plunger pump with a plurality of plungers and a drive unit therefor which is arranged in a housing, the plungers being arranged equidistantly on a circle and the drive unit comprising a roller which is mounted rotatably in the housing and carries along a wobble plate with wobbling action about the axis of rotation of the roller, axially moveable plunger actuators each coupled to a plunger being pressed against the wobble plate.

Abstract: A variable capacity compressor like a swash plate type where a pressurized fluid is fed to a control pressure chamber such as a swash plate chamber to apply a backpressure to a piston etc. and the backpressure is changed by the capacity control valve, wherein the valve is streamlined and reduced in cost by providing a simple valve such as a two-way solenoid valve as a capacity control valve in a feed path to or discharge path from the control pressure chamber. By controlling the duty ratio of the valve, it is possible to smoothly change the capacity of the compressor. Further, a torque sensor is provided at a drive shaft, and the valve is controlled by a control unit to change the discharge capacity of the compressor in accordance with that detection value.

Abstract: This invention relates to a wind mill which is designed to convert rotational energy to mechanical energy to drive one or more pistons to raise a liquid such as water to an elevated location if necessary at a positive pressure. In addition, the present invention may be adapted to pressurize a medium, such as a gas, for storage in a reservoir.

Abstract: A sensor for a variable displacement pump is provided. The pump has a housing containing a swashplate that is adapted to rotate about an axis. The sensor includes a magnet connected to the swashplate to rotate with the swashplate. A semiconductor chip is disposed proximate the magnet and within the housing. A control is adapted to direct a current through the semiconductor chip and to determine the voltage across the semiconductor chip. The control is further adapted to determine the angle of the swashplate relative to the housing based on the determined voltage.

Abstract: The invention relates to a hydrostatic machine (1) comprising at least one first hydrostatic unit (E1) and one second hydrostatic unit (E2), each hydrostatic unit (E1, E2) comprising respective pistons (14a, 14b) guided in respective cylinder drums (13a, 13b) and supported by respective swiveling bodies (17a, 17b) that can be adjusted by respective adjustment devices (6a, 6b), and further comprising respective control bodies (25a, 25b). A one-piece main housing body (2) radially surrounds the cylinder drums (13a, 13b), the control bodies (25a, 25b), and the adjustment devices (6a, 6b) of both hydrostatic units (E1, E2), and assigns pressure channels for supplying a pressure medium to and discharging it from the control bodies (25a, 25b) of both hydrostatic units (E1, E2). A first add-on housing body (3a) is disposed on a first side of the main housing body (2), and bears a swiveling body (17a) of the first hydrostatic unit (E1).

Abstract: A displacement control mechanism controls displacement of a variable displacement type compressor that forms a refrigerant circulation circuit for an air conditioning apparatus. The displacement is decreased as a pressure in a crank chamber rises while being increased as the pressure in the crank chamber falls. The displacement control mechanism includes a bleed passage, a supply passage, a first control valve and a second control valve. The second control valve includes a back pressure chamber, a valve chamber, a valve body, a spring and a second valve portion. The second valve portion is provided with the back surface of the valve body. The second valve portion closes an opening of an introduction passage in the back pressure chamber when the first valve portion maximizes the opening of the bleed passage.

Abstract: A piston type compressor includes a suction valve mechanism. The suction valve mechanism includes a rotary valve coupled to a rotary shaft. A valve timing adjusting apparatus is capable of changing a relative rotational phase, which is a rotational phase of the rotary valve relative to the rotary shaft. Therefore, the compressor is capable of adjusting the valve timing of the rotary valve and has a reduced size in the axial direction.

Abstract: A swash plate for a swash plate-type, variable displacement compressor, such that the compressor is driven by a drive shaft having a shaft axis. The swash plate includes a boss that is penetrated slidably by the drive shaft. The boss is connected slidably to a rotor that is fixed to the drive shaft, whereby a variable, oblique angle is formed between a surface of the swash plate and the shaft axis. The boss is connected securely within the swash plate and comprises a nitrided surface layer.

Abstract: As a swash plate of a variable displacement compressor slides along a drive shaft, while being inclined, the displacement of the compressor is changed. A step is formed on the drive shaft between the swash plate and a cylinder block. The step has a seat surface, which functions as a spring seat. The seat surface faces the swash plate. A return spring is located between the spring seat and the swash plate to urge the swash plate in a direction increasing the inclination angle. The step is directly formed on the drive shaft. Therefore, the number of components and the number of steps required for manufacturing the compressor are reduced.

Abstract: A pneumatically-operated control valve selectively opens and closes a passage between discharge and crankcase chambers of a variable capacity refrigerant compressor for purposes of controlling the compressor capacity, and includes an integral pressure sensor for measuring the compressor discharge pressure. The valve includes a plunger having an axis, a stopper biased against a seat in the passage coupling the discharge and crankcase chambers, an annular bellows and a pressure sensor. A portion of the plunger passes through the annular bellows, and one end of the bellows is attached to the plunger for axially displacing the plunger to unseat the stopper. The stopper and plunger are maintained in engagement, and have axial bores that are aligned to form a passage between the compressor discharge chamber and a cavity in which the pressure sensor is retained.

Abstract: In a variable displacement hydraulic pump having a housing with a multiplicity of interconnected surfaces, including opposed end surfaces and intermediate side surfaces, the improvement comprising the location of at least one case drain orifice in each of a plurality of differing ones of the surfaces in a manner such that at least one of the orifices is located in the vicinity of the top surface of the housing in any spatial orientation of the housing.

Abstract: An axial piston engine (1), including a housing (2) in whose inner compartment (4) a cylinder drum (17) and a swash plate (26) located axially adjacent thereto are situated. Several piston bores (21), which extend approximately parallel to the central axis of the cylinder drum (17) are located in the same, pistons (23) being displaceably guided in the piston bores. The ends of the pistons facing towards the swash plate (26) are supported on the swash plate (26). A driving shaft (7) is rotatably mounted in the housing (2) and is connected to the cylinder drum in a fixed manner secured against rotation therebetween by a multitooth coupling (19) comprising teeth (43a, 44a) and tooth spaces (43b, 44b) which alternate regularly in a peripheral direction and which engage with each other.

Abstract: A piston type compressor includes a housing forming a cylinder bore. A drive shaft is supported by the housing. A cam plate is coupled to the drive shaft and is rotated by the rotation of the drive shaft. A piston is accommodated in the cylinder bore and is coupled to the cam plate. The rotation of the cam plate is converted into the reciprocating movement of the piston. In accordance with the reciprocating movement of the piston, gas is introduced into the cylinder bore, is compressed and is discharged from the cylinder bore. Compression reactive force is generated in compressing the gas by the piston, is transmitted to the housing through a compression reactive force transmission path and is received by the housing. A vibration damping member is made of a predetermined vibration damping alloy and is placed at least one location along the compression reactive force transmission path.

Abstract: A method of assembling a tandem pump comprising first and second pumps connected in tandem by an interface. Each pump has a housing and an end cap containing hydraulic porting. The interface connects the end cap of one pump to the housing of the other pump.