Abstract: A compressor assembly has a pulley assembly and a compressor, with a mounting plate mounted therebetween. The compressor includes a front head, a rear head, and a piston assembly operably mounted between the front head and the rear head. A plurality of case bolts extend through the mounting p late, the front head, and into the rear head.

Abstract: Systems, methods, components, and parts are provided for improving casting and electroplating performance of a plated cast part by doping a semiconductor material with an electrically active dopant before mixing the semiconductor material into a base material. The doped semiconductor material improves the castability of the base material and has an improved electrical conductivity which is closer to that of the base material such that a consistency of a subsequent plating on the part is improved.

Abstract: A motor-hydraulic machine unit includes an electric motor, a hydraulic machine, and a connection body that has a planar connection surface which delimits first and second working connections. The first and second working connections are each in fluid exchange connection with the hydraulic machine via an assigned first fluid duct in the connection body. The electric motor and the hydraulic machine have a common axis of rotation which is arranged substantially parallel to the connection surface. The hydraulic machine and the electric motor are arranged on opposite sides of the connection body in the direction of the axis of rotation. The connection body is traversed by a drive aperture in the direction of the axis of rotation. The electric motor and the hydraulic machine are in rotary drive connection in a region of the drive aperture.

Abstract: A radial piston hydraulic device distributed by pilot operated check valves includes a housing, a plurality of piston assemblies, a main shaft, the rotating shaft, first pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies, and second pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies. The housing includes a plurality of piston chambers, a rotating shaft chamber, a high-pressure oil passage, and a low-pressure oil passage. Each of the plurality of piston assemblies is slidable up and down in a corresponding piston chamber of the plurality of piston chambers. The main shaft is rotatably connected to the housing and is connected to the plurality of piston assemblies in a transmission way.

Abstract: Microfluidic systems, pumps, valves and applications of the same are provided. The microfluidic system may be a pump or a valve having a fluidic chip and an actuator controlling the opening and closing of the fluidic channel in the fluidic chip. The actuator may be disposed to tilt from the fluidic chip, forming a tilted-rotor peristaltic pump. Alternatively, the actuator may be a rolling ball actuator, and different fluidic chips may be used in different applications. For example, the fluidic chip may be a spiral pump chip having spiral channels, a rotary peristaltic pump chip having multiple output channels, or a multi-port valve chip having one port interconnected with multiple different ports. An analytical valve chip may switchably interconnect bioreactor and rinse/calibration input channels to sensor and waste output channels. The actuator of a random-access valve can move from one valve position to another without opening or closing intermediate ones.

Abstract: A swashplate-type axial piston machine includes a housing and at least one working channel extending through a distributor plate. The at least one working channel opens out at an outside on the housing at an associated working port. The at least one working channel includes a first section and a second section. The first section extends over the entire distributor plate. The second section is arranged entirely in the housing. The second section directly adjoins the first section. A first rotary bearing has an outer circumferential surface that defines a circular cylindrical reference cylinder about the axis of rotation.

Abstract: A hydrostatic transmission subassembly for a vehicle includes an adapter manifold and a hydraulic pump mounted to the adapter manifold. The pump includes a pump housing and a pump porting manifold including pump porting for communicating fluid to and from the pump. The adapter manifold may include a mounting section adapted for mounting to the vehicle and a fluid interface section extending from the mounting section. The fluid interface section includes a pump interface having pump interface porting, in which the pump interface engages with the pump porting manifold to fluidly connect the pump interface porting with the pump porting. When the mounting manifold is mounted to the vehicle via the mounting section, the mounting manifold supports the hydraulic pump. The fluid interface section also includes a motor interface having motor interface porting for fluidly connecting to a motor, which enables the mounting manifold to fluidly connect the pump and motor.

Abstract: The present disclosure discloses a swashplate-type axial plunger pump with multi-channel oil feed and full-flow self-cooling and double-end-face flow distribution. The cooling oil suctioned by the plunger pump firstly cools the friction pair of the cylinder block and the plunger; then, one part of the cooling oil passes through a gap between the pump case and the cylinder block and enters the control chamber by passing by the friction pair of the oil distribution plate and the cylinder block to cool the friction pair of the oil distribution plate and the cylinder block; and the other part of the cooling oil passes through a gap between the pump case and the cylinder block and enters the control chamber by passing by the friction pair of the slipper and the swashplate to cool the friction pair of the slipper and the swashplate.

Abstract: A replacement kit includes a first coupler that includes a first inner axial end, a first outer axial end, and a first coupler attachment portion including a first forked oblong structure that defines a first minor axis with a first minor axis length, and a first major axis with a first major axis length that is greater than the first minor axis length, and including a first prong, a second prong disposed axially away from the first prong, and defining a first predetermined axial distance, and a first cam surface disposed between the first prong and the second prong.

Abstract: A hydraulic energy transfer system including an isobaric pressure exchanger (IPX) configured to exchange pressure between a first fluid and a second fluid. The IPX includes a channel formed by the IPX. The IPX is designed to direct the first fluid to a first opening of the channel and the second fluid to a second opening of the channel. The IPX further includes a barrier disposed within the channel. The barrier is designed to reduce mixing of the first fluid and the second fluid while exchanging pressure between the first fluid and the second fluid within the channel.

Abstract: A method for measuring an axial-force of a bolt fastened to a component to be fastened, includes temporarily fastening the bolt to the component to be fastened with a temporarily-tightening torque, the temporarily-tightening torque being a torque which is determined in advance and by which a depression is formed on a head of the bolt, measuring a first axial force of the temporarily-fastened bolt, regularly fastening the bolt to the component to be fastened with a regularly-tightening torque, the regularly-tightening torque being torque which is determined in advance and larger than the temporarily-tightening torque, measuring a second axial force of the regularly-fastened bolt, and measuring an estimated axial force of the regularly-fastened bolt by using the torque with which the bolt is temporarily fastened, the torque with which the bolt is regularly fastened, and a difference between the first and second axial forces.

Abstract: Disclosed is a hydraulically driven joint for a robot, which comprises a screw-in cartridge rotary direct-drive electro-hydraulic servo valve and a vane oscillating hydraulic cylinder special for a robot motion joint, the screw-in cartridge rotary direct drive electro-hydraulic servo valve is hereinafter referred to as a hydraulic cartridge rotary direct-drive valve and the vane oscillating hydraulic cylinder special for the robot motion joint is hereinafter referred to as a vane oscillating cylinder, a valve body installation cavity is prefabricated at one end of a center of a center rotating shaft of the vane oscillating cylinder, a shape of the valve body installation cavity is manufactured according to a shape of a plug-in portion of the hydraulic cartridge rotary direct-drive valve, and the hydraulic cartridge rotary direct-drive valve is plugged into the valve body installation cavity.

Abstract: The present invention discloses a power head of a vertical reciprocating pump with multi-spherical connection, and a water injection pump using the same, which includes a hydraulic end, a centralizing sleeve, an adjustable ball seat, a circular pull-back plate, pull rods of the power head, and a hydraulic end, an integrated base and the alike. By using the structure with multiple movable spherical surfaces, the error of the oblique disk during its motion along the elliptic trajectory can be eliminated. The power end can be linked with hydraulic ends and can be applied to boosting water injection processes for feeding liquid at low pressure or feeding liquid at high pressure in oil fields and various high-pressure liquid delivery fields. The fast on-site installation of the water injection pump of the present invention can be realized by the integrated base, so as to save the investment and improve the safety factor.

Abstract: The invention relates to a hydraulic pump wherein a barrel is in sliding connection with a shaft and is driven in rotation by the shaft. A housing is formed in the barrel, the shaft sliding in the housing while projecting from the front face of the barrel. The housing and the shaft defining between them a balancing chamber, the balancing chamber being connected to a delivery aperture in such a way that fluid in the balancing chamber exerts a compressive force on the barrel which tends to press the barrel against a port plate.

Abstract: An electronic limited slip differential system constructed in accordance to one example of the present disclosure is provided. The system includes an axle housing defining an inner chamber, a differential assembly disposed within the inner chamber, and a hydraulic control unit (HCU) coupled directly to a top of the axle housing such that the HCU is mounted on a top of the differential assembly.

Abstract: A variable-displacement hydrostatic axial piston motor of bent-axis construction includes a drive shaft, a cylinder drum that pivots in a pivoting plane, and a one-piece port plate nearly symmetrical with a central plane and with two working ports. The motor further includes an adjusting device with an adjusting piston arranged in the port plate, a control valve arranged on the port plate and with a control valve piston, a feedback spring arranged in the port plate and clamped between the adjusting piston and the control valve piston, a counterbalance valve with a counterbalance spool, and two secondary pressure-limiting valves inserted as cartridge-type inserts into the port plate. The counterbalance spool is accommodated in a valve bore in the port plate. The two working ports are situated on the port plate opposite to the first side. The two secondary pressure-limiting valves are arranged on the same side as the port surfaces.

Abstract: A fluid pressure pump and a fluid pressure system in which leakage of fluid and ablation of a cylinder block and a port plate can be prevented by pressing the cylinder block to the port plate with an appropriate pressing force. A hydraulic pump includes a cylinder block that has a cylinder chamber that may be in communication with an oil passage of a port plate and in which a piston is housed; and a cylinder block pressing means imparting, to the cylinder block, a pressing force that presses the cylinder block to the port plate. The cylinder block pressing mechanism has a changing means that changes the force that presses the cylinder block to the port plate.

Abstract: A rotary isobaric pressure exchanger (IPX) includes a first end cover having a first surface that interfaces with a first end face of a rotor, wherein the first end cover has at least one first fluid inlet and at least one first fluid outlet. The IPX includes a second end cover having a second surface that interfaces with a second end face of the rotor, wherein the second end cover has at least one second fluid inlet and at least one second fluid outlet. The IPX includes a port disposed through the first surface of the first end cover or through the second surface of the second end cover, wherein during rotation of the cylindrical rotor about the rotational axis the port is configured to fluidly communicate with at least one channel of the plurality of channels within the rotor.

Abstract: A fluid pressure pump and a fluid pressure system in which leakage of fluid and ablation of a cylinder block and a port plate can be prevented by pressing the cylinder block to the port plate with an appropriate pressing force. A hydraulic pump includes a cylinder block that has a cylinder chamber that may be in communication with an oil passage of a port plate and in which a piston is housed; and a cylinder block pressing means imparting, to the cylinder block, a pressing force that presses the cylinder block to the port plate. The cylinder block pressing mechanism has a changing means that changes the force that presses the cylinder block to the port plate.

Abstract: A flow divider assembly for use with a hydraulic pump provides flow to separate drive motors for use in a vehicle or other application. A pair of flow divider motors may be mounted on a block and have a common axis of rotation. The ratio between the two may be controlled by adjustment of the angles of the respective thrust bearings of the flow divider motors. A valve may connect the outlet of one of the flow divider motors or the outlet of the other flow divider motor. passage to the second outlet passage. Additional bypass valves may be provided to permit direct connection between the hydraulic pump and the separate drive motors.

Abstract: A hydraulic unit includes a housing, a pump located in the housing, and a motor located in the housing and operably connected to the pump such that the motor is driven in response to fluid pressure delivered to the motor from the pump. An output shaft is operably connected to and driven by the motor and includes a body having a first end and a second opposite end, and a first flange and a substantially identical second flange integrally formed with the body of the shaft adjacent the second end. A relief is formed about a circumference of the body. A plurality of first splines are integrally formed with an exterior of the body between the second portion and the third portion, and a plurality of second splines are integrally formed with an interior surface of the body adjacent the second end.

Abstract: Valve and/or port plates incorporating or formed entirely of ceramic can each be provided with a reinforcing band. The band, which can optionally be metal, can be placed around the plate to provide additional strength to the plate, thereby allowing for a reduction in the overall diameter and/or thickness of the plates and, thus, the use of less ceramic material. The band can hold the plate in compression and/or be glued to hold the band in place.

Abstract: An opposed swash plate type fluid pressure rotating machine in which a first piston and a second piston projecting from opposite ends of a cylinder block reciprocate in a cylinder, respectively following a first swash plate and a second swash plate includes a center spring for biasing the cylinder block toward the second swash plate. A housing hole (biasing force receiving part) for receiving a biasing force of the center spring is formed on one end part of the cylinder block. The tip of a second neck (reaction force receiving part) for receiving a reaction force from the second swash plate is formed on the other end part of the cylinder block. The cylinder block is biased only toward the second swash plate by the center spring.

Abstract: A swash plate 3 includes a substrate 11 made of an iron-based material, a hard first resin layer 12 provided to coat an end surface of the substrate 11, and a soft second resin layer 13 provided to coat the first resin layer 12. A spiral annular groove 12A is formed in a surface of the first resin layer 12, and the second resin layer 13 is provided to match the sectional shape of the first resin layer 12. With the soft second resin layer 13 on a sliding surface 3A of the swash plate 3, a swash plate 3 having a good fit in an initial stage of sliding can be provided. When the second resin layer 13 partially wears, a protrusion 12 of the first resin layer 12 of the hard resin is exposed to provide good wear resistance and good sliding properties.

Abstract: A rotational shaft 22 receives input of torque that is output from an electric motor 19. A housing 23 rotatably supports the rotational shaft 22. A cylinder block 24 inside the housing 23 rotates with the rotational shaft 22. The pistons 25 are supported relative to the respective cylinder chambers 24a in the cylinder block 24 so as to be slidably displaceable. A swash plate 26 is provided so as to come into contact with ends of the pistons 25 and be rotatable around the rotational shaft 22 with the pistons 25, and be rotatable about a rotation centerline that is obliquely inclined relative to the rotational shaft 22. A case 27 inside the housing 23 is pivotably supported relative to the housing 23. A bearing portion 28 holds the swash plate 26 relative to the case 27 so as to be rotatable around the rotation centerline.

Abstract: Disclosed is a wobble plate type variable displacement compressor that uses a constant velocity universal joint mechanism, which comprises an inner ring and an outer ring, balls that are held between guide grooves of the inner ring and the outer ring to transmit power, wherein a wobble plate is connected and fixed to the outer ring. In the compressor, at least any one of the guide grooves opposing each other of the inner and outer rings is formed along a guide groove cross-sectional profile to come into contact with a ball at two points. With this wobble plate type variable displacement compressor using the specified constant velocity universal joint mechanism, the ball retaining structure between the inner and outer rings in the wobble plate rotation preventing mechanism can be improved, and desired power transmission can be stably performed.

Abstract: The invention relates to a cylinder drum (1?) for a hydrostatic piston engine, having at least one kidney-shaped control port/cylinder bore transition (5?, 5?, 5??) which leads into a cylinder bore (2, 2?a) for receiving a piston that can be axially displaced therein, wherein the kidney-shaped control port/cylinder bore transition (5?, 5?, 5??) is configured perpendicular to the flow direction in a stepless and edge-free manner.

Abstract: A speed pick-up ring includes a main body having a plurality of targets and defining a plurality of notches. Each notch is disposed between adjacent targets. Each notch includes a base wall, a first sidewall and an oppositely disposed second sidewall. The base wall includes a convex portion. A fluid device includes a housing and a variable reluctance speed sensor engaged to the housing. The fluid device further includes a speed pick-up ring disposed within the housing. The speed pick-up ring includes a main body having a plurality of targets and defining a plurality of notches. Each notch is disposed between adjacent targets. Each notch includes a base wall, a first sidewall that is generally concave and an oppositely disposed second sidewall that is generally concave. The base wall includes a convex portion.

Abstract: A pressure regulating restriction for allowing a cylinder bore and a valve plate discharge port to communicate with each other before the cylinder bore communicates with the valve plate discharge port, and an oil passage for allowing the valve plate discharge port and the cylinder bore to temporarily communicate with each other in a time period after the cylinder bore is freed from the communication with the valve plate suction port until the cylinder bore communicates with the pressure regulating restriction. The oil passage has length capable of transmitting high pressure in the oil passage on a side of the cylinder bore at the time of the communication and of restoring the pressure in the oil passage on the side of the cylinder bore to the pressure on a side of the valve plate discharge port before the communication with a next cylinder bore at the time of non-communication.

Abstract: A port plate is disclosed for use with an axial pump. The port plate may have a cylindrical plate member with a head-end face and a piston-end face located opposite the head-end face, at least one inlet port formed within a first half of the plate member and extending from the head-end face through the piston-end face, and at least one outlet port formed within a second half of the plate member and extending from the head-end face through the piston-end face. The port plate may also have at least one timing hole formed within the plate member at a leading end of the at least one outlet port and passing from the head-end face through the piston-end face, and an arcuate spherical groove extending from the at least one timing hole to the at least one outlet port.

Abstract: A reciprocator restraint assembly for a Z-crank axial piston machine is described. The assembly includes two gimbal arms each linked together at gimbal link joint that intersect at a point T. Point T lying in a medial plane M being defined as the plane passing through the point of coincidence of the crank and crankshaft axes to which the line that bisects the crank angle is normal. Each of the gimbal arms is pivotally mounted at an identical distance L from point T. A cylinder gimbal is pivotally mounted from the cylinder cluster and a reciprocator gimbal is pivotally mounted from the reciprocator. The reciprocator gimbal pivot axis is equidistant from point X and T as is the cylinder gimbal pivot axis.

Abstract: A hydrostatic axial piston machine of swash plate design includes a pivot cradle configured to be pivoted by a regulating valve. The movement of the pivot cradle is fed back to the regulating valve via a return spring. The return spring is attached to the pivot cradle in the region between its end section on the regulating-valve side and an end section which is remote from the regulating valve.

Abstract: On a near-bottom inner surface of a tilt piston cylinder hole, only a limited part that contacts an end of a tilt piston when the tilt piston is tilted by a pressing force from a swash plate is laser-hardened along the circumferential direction of the tilt piston cylinder hole (i.e., a hardened part is formed). In the tilt piston cylinder hole, parts other than a near-opening inner surface and the near-bottom inner surface are not laser-hardened.

Abstract: Provides is a variable displacement swash plate type compressor comprising a drive shaft, a lug plate fixedly installed at one side of the drive shaft, a swash plate dispose at another side of the drive shaft and rotated by the lug plate to vary a tilt angle thereof, a sleeve reciprocally moving along the drive shaft to let the swash plate rotate, and a spring supported between the sleeve and the lug plate, characterized in that the variable displacement swash plate type compressor comprises a restriction ring installed around the drive shaft between the lug plate and the sleeve to contact with the swash plate at a maximum tilt angle of the swash plate, wherein an end of the restriction ring is contacted with the lug plate and another end of the restriction ring is supported by the spring. Thus, since the direct contact between the swash plate and the lug plate is prevented, when the swash plate reaches at the maximum tilt angle, it is possible to reduce the noise and the wear remarkably.

Abstract: An axial piston machine includes a housing having a casting which is optimized with respect to casting. An insert ring which is optimized with respect to a pressure load is formed in the bottom of the housing. The insert ring is configured to be used with such an axial piston machine.

Abstract: A bent axis, variable displacement inline drive device may comprise: a port plate having fluid passages; a cylinder block rotatably mounted adjacent the port plate and having axial cylinders having openings in alternating fluid communication with the fluid passages; a rotatable shaft coupled through the port plate to the cylinder block, pistons in the cylinders and having a connecting rod extending from the cylinder block; a rotatable spindle having receptacles for receiving the connecting rods; a pivotable yoke having the spindle rotatably mounted thereon, whereby the rotating group comprising the spindle, pistons and cylinder block are connected by the connecting rods for rotating together, the yoke being pivotable for angling the spindle relative to the cylinder block. The device may be employed as a pump, or as a motor, or as both a pump and a motor, and the yoke may be pivoted over center.

Abstract: Apparatus for a pump assembly and a fluid metering unit. The pump assembly can include a diaphragm with a portion of a body being molded over a portion of each one of a plurality of pistons. The pump assembly can include a wobble plate, a lower housing, and a spring positioned between the wobble plate and the lower housing. A valve housing can include pumping chambers with side walls that are angled. The fluid metering unit can include a bayonet locking mechanism and/or a seal between a housing and a flow meter. The controller can be calibrated according to the type and/or temperature of the fluid.

Abstract: A compressor includes a rotary shaft, a cam, a cylinder block, pistons, a thrust bearing, a rotary valve, and an oil passage. The rotary shaft has an in-shaft passage formed therein. The in-shaft passage has an outlet open to the outer peripheral surface of the rotary shaft. The cam rotates integrally with the rotary shaft. The pistons are coupled to the rotary shaft through the cam. The thrust bearing is provided between the cam and the cylinder block. The thrust bearing includes a first race in contact with the cam, a second race in contact with the cylinder block, and rolling elements retained between the first and second races to form a gap therebetween. The oil passage is formed in the outer peripheral surface of the rotary shaft so as to extend from the gap to the outlet of the in-shaft passage.

Abstract: In a tandem piston pump (1) from which pump discharge pressure from four systems is extracted, a tilt axis direction of a front swash plate (14) and a tilt axis direction of a rear swash plate (54) are different to each other, respective discharge ports (23, 24) of a rear pump (50) are opened at a phase difference relative to respective discharge ports (21, 22) of a front pump (10), and respective pump ports (41, 42) of the front pump (10) and respective pump ports (43, 44) of the rear pump (50) are opened in different side faces (71, 72) of a port block (70).

Abstract: There are provided a swash member and a first and second rotational members which are held on a base member through a universal joint mechanism and can rock about two axes out of three orthogonal axes including a center of the mechanism, a pump mechanism for transferring a low-pressure non-compressible fluid in a low-pressure pipe portion to a high-pressure pipe portion filled with a high-pressure non-compressible fluid being pressurized by a pressure accumulation mechanism, a control valve device which controls connection between both the pipe portions and a plurality of rocking-torque generation mechanisms which couple the base member and the swash member to each other and are driven by the fluids for generating a rocking torque to the swash member, and rocking-angle adjustment unit for changing a relative angle between the two rotational members.

Abstract: A valve plate is used in a swash plate type motor including a motor shaft and a cylinder block in a motor housing and includes: a sliding supporting surface contacting a rear end surface of the cylinder block to support the cylinder block; a supporting surface that is a surface corresponding to and opposite to the sliding supporting surface; a central through hole through which the motor shaft penetrates; and a plurality of ports and formed around the central through hole as inlets and outlets of operating oil so as to penetrate the valve plate, and a cooling concave portion into which the operating oil flows is formed in a region except for the ports and on the supporting surface.

Abstract: A method of controlling a piston pump is disclosed. The method includes actuating a plurality of pistons housed within a cylinder barrel to cause each of the plurality of pistons to engage in reciprocating motion. Fluid supplied to each of the pistons may be regulated by changing a clock position of an intake cam ring to cause a plurality of intake valves to open and close relative to the clock position of the intake cam ring. Fluid discharged by each of the pistons may be regulated by changing a clock position of an exhaust cam ring to cause a plurality of exhaust valves to open and close relative the clock position of the exhaust cam ring.

Abstract: The present invention relates to a compressor, wherein a rotary shaft 140 having a swash plate 144 coupled thereto is used to linearly reciprocate a piston 150 in a cylinder bore 134 formed in front and rear cylinder blocks 130 and 130?. The rotary shaft 140 has a flow channel 142 formed therein and inlets 142a formed to communicate with the flow channel 142. A hub 146 is formed in the swash plate 144, and a shaft hole 146a, through which the rotary shaft 140 passes, is formed in the center of the hub 146. Communication holes 146b are formed in the hub 146 to communicate with the inlets 142a of the flow channel 142. First races 148a are coupled to the hub 146. A rotary shaft hole 148d is formed in the first race 148a, which has a thickness greater in its outer peripheral portion than its inner peripheral portion.

Abstract: A gyroscopic rotary engine includes a rotary disc used as a cylinder block; a cylinder head on which medium inlets and medium outlets are arranged in a spaced relation; wherein at least two arched cylinders are disposed on the rotary disc in an equally spaced-apart relation; a gyroscopic unit disposed obliquely on the rotary disc relative to an axis of the rotary disc, the gyroscopic unit comprising a rotation shaft and pistons positioned symmetrically about the rotation shaft and having the number corresponding to the number of the arched cylinders, the pistons being disposed in the respective arched cylinders and firmly secured to the rotation shaft by respective connecting rods; and the rotary disc rotatably engaged with the cylinder head.

Abstract: A dual pump apparatus having two pumps mounted in a housing, where the housing comprises two elements mounted on opposite sides of a hydraulic mounting member or center section. The pumps are mounted on one side of the hydraulic mounting member in a pump cavity, and the hydraulic mounting member and second housing element form a drive cavity in which gears or an endless coupling member such as a chain or belt to connect the two pump input shafts are located.

Abstract: A first swash plate (30) and a second swash plate (40) are disposed on either side of a cylinder block (4), and a plurality of cylinders (6) are disposed in the cylinder block (4). A first piston (8) and a second piston (9) are inserted opposite to each other in each cylinder (6) such that the first piston (8) slides on the first swash plate (30) and the second piston (9) slides on the second swash plate (40). By providing a servo mechanism (33) that tilts the first swash plate (30) and a tilt linking mechanism (40, 70) that tilts the second swash plate (40) in conjunction with the tilting of the first swash plate (30), tilt angles of the two swash plates (30, 40) can be controlled by the single servo mechanism (33).

Abstract: A double-headed piston type compressor includes front and rear housings, a cylinder block defining therein a crank chamber and a plurality of cylinder bores and having a shaft hole therethrough, a double-headed piston accommodated in the cylinder bores for reciprocating therein, a rotary shaft rotatably supported by the shaft hole, compression chambers defined by the cylinder bores, a suction chamber defined by the front housing and an introduction passage having a rotary valve for introducing refrigerant from the suction chamber into the compression chambers. The introduction passage includes a communication passage formed in the cylinder block for connecting the suction chamber to the shaft hole, suction passages connecting the shaft hole and the compression chambers and a recessed passage formed in the outer circumferential surface of the rotary shaft for connecting intermittently between the communication passage and the respective suction passages in accordance with the rotation of the rotary shaft.

Abstract: An axial piston machine is provided. A housing of the machine receives an eccentric disk and a rotatably mounted cylinder drum. The drum has cylinders and pistons. The pistons are reciprocatable in the cylinders. The ends of the cylinders project from the cylinders and are supported via sliding blocks against a sliding surface on the eccentric disk. The sliding blocks are held in abutment with the sliding surface through a holding-down device. A pressure prevailing in a pressure chamber under the sliding blocks by a throttle point partially compensates a force that is exerted by the holding-down device on the sliding blocks, through a hydraulic pressure between an annular seating surface of the sliding blocks and a support surface of the holding-down device.

Abstract: An axial piston machine, especially an air-conditioning compressor for motor vehicles, including a power unit which is rotatably driven by a shaft and in which the rotary movement is converted, via a swash plate, a wobble plate, or a pivot ring, into a fore-and-aft movement of pistons that suction in and compress pressure media. The shaft is mounted in a forward, first axial bearing, among other things.

Abstract: A low pressure fluid powered motor or pump comprises a non-rotatable cover (k); an undulating lobe cam track (e) attached to the cover (k) and defining multiple crests and troughs; a rotatable cylinder block (c); at least three reciprocating pistons (d) each housed within a bore of the cylinder block (c) and each providing at one end a crown (d1), and at the other end a spherical seating cup (d2); a ball (f), adapted to engage with the cam track (e); a non-rotatable manifold block (n) incorporating a plurality of ports (s), each being radially disposed at equal intervals in an end face of the manifold block adjacent the pistons (d), with the ports (s) linked to galleries connected to a higher pressure delivery circuit, and a lower pressure return circuit, with the angular arrangement of the ports (s) being such that the higher pressure is supplied to the crown (d1) of each piston (d) only while the piston (d) is moving from a crest to a trough of the cam track (e), with a switch to the lower fluid pressure ci