Abstract: A hydraulically operated swash-plate apparatus includes a cylinder block rotatably supported in a case and having a plurality of axial cylinders arranged in an annular pattern, the case having an end plate for bearing a thrust load from the cylinder block, a plurality of plungers received respectively in the cylinders, a swash plate supported in the case by trunnions and slidably held against the free ends of the plungers, an actuator for tilting the swash plate, the plungers being movable into and out of the respective cylinders by a stroke which is variable according to the angle of inclination of the swash plate, a support member by which the trunnions are rotatably supported, and a tension member coupling the end plate and the support member to each other. The apparatus also includes a stopper mounted in the case for engaging a back of the swash plate to limit the maximum angle of inclination of the swash plate.

Abstract: A swash plate type hydraulic pumping assembly (10) including a plurality of pistons (28) axially reciprocated in individual chambers (22) of a rotor (20). Each piston (28) includes a hollowed central cavity (30) supporting a compression spring (54) which urges the piston (28) out of the chamber (22) and toward a camming surface (64) of the swash plate (60). A tube (42) is disposed in the chamber (22) adjacent a hydraulic fluid exhaust port (24) and forms the only flow route for fluid entering or exiting the chamber (22). A top surface (34) in the cavity (30) of the piston (28) is spaced from the exhaust port (24) and collects gas inclusions trapped in the fluid during operation. When the piston (28) is moved in the chamber (22) to a fully compressed position, the top spaced surface (34) is very close to the tube (42) allowing the trapped gas inclusions to be swept away from the top spaced surface (34) and out of the pump assembly (10).

Abstract: A vehicle includes at least a pair of drive wheels, each wheel being independently controlled by an integrated transmission, each transmission being powered by an input shaft operably driven by a common engine. Each transmission is of a type wherein a pump head with pistons is driven by the input shaft and conveys output fluid to a motor head which is driven thereby and rotates an output shaft. Pump head output is controlled by an operator variable swash plate. The transmission integrally includes a dampening mechanism for the swash plate, a positive neutral structure for the swash plate, an automatic parking brake with override mechanism to allow setting of the brake or release of the brake by the operator, a porting block communicating fluid flow between the pump heads and providing for overpressure relief, and a charge pump for communicating makeup fluid to the pump head and to circulate the fluid so as to cool same.

Abstract: An adjustable axial piston machine is disclosed which has a housing, a cylinder drum and an operating cylinder-servo piston unit capable of being acted upon by control pressure. The cylinder-servo piston unit has a movable part which is being connected with a control of the axial piston machine. The operating cylinder-servo piston unit has an annular configuration and is located around the cylindrical drum.

Abstract: In a multiple piston axial type pump, a support saddle and cooperating swash block are enclosed by a housing. A pair of arcuate bearing shells are attached to spaced apart bearing seats formed on the swash block. The bearing shells contact load bearing surfaces on the support saddle. The length of each of the bearing shells is less than the length of the support saddle load bearing surfaces so that the facing surfaces of the bearing shells are always in complete contact with the load bearing surfaces throughout the complete range of relative positions of the support saddle and the swash block.

Abstract: An adjustable axial piston machine having a bent axis design having a cylindrical drum rotatably supported on a swivel carriage which has a pair of channels formed therein. One channel is connected with a fluid feed channel and the other channel is connected with a fluid discharge channel. The cylindrical drum is connected to a rotatable shaft and has a plurality of pistons located in cylinders formed in it. A housing for the swivel carriage has a concave guide surface for the face of the swivel carriage facing the guide surface. Support pistons are pivotably connected at one end to the machine housing and supported on the swivel carriage. A plurality of pairs of counteracting servo pistons adjust the position of the support pistons and the cylindrical drum to modify the length of the stroke of the pistons located within the drum.

Abstract: A bearing arrangement particularly useful for supporting the driveshaft of a thermal engine in which the driveshaft is acted upon by a rotating bending load. Since a rotating bending load of such thermal engines generates driveshaft bending deflections which rotate with the driveshaft, the bearings supporting the driveshaft must be capable of accommodating such deflection. Conventional rolling element type bearings can accommodate driveshaft deflection or wobble but have limited operational lifespans. In accordance with this invention, a driveshaft bearing arrangement is provided utilizing plane bearings having spherical surfaces which restrain radial loads while accommodating driveshaft wobble. In one embodiment, the spherical bearing includes a ring member affixed to the driveshaft having a spherical outer surface which closely conforms to a concave bearing surface.

Abstract: A variable displacement swash-plate type compressor suitable for use as a refrigerant compressor of an automotive air conditioner has a cylinder block having a plurality of cylinder bores each slidably receiving a double-headed piston, a shaft driven by an automotive engine, a swash plate tiltably mounted on the shaft for rotation therewith to reciprocatorily move the pistons, and a spool for moving the swash plate axially of the shaft and changing the angle of tilt of the swash plate. The swash plate and the shaft are connected in such a manner that, when the swash plate is axially moved while changing its tilting angle, the position of stroke end of each piston is changed only in a working chamber on one end of the piston, whereas no change in the position of the stroke end occurs in the other working chamber on the other end of the piston.

Abstract: The invention concerns a roller bearing for performing swivel motions including a mechanism for synchronously guiding the roller bearing cage, including a roller bearing cage having a journal with a rotatable pinion gear flexibly and elastically mounted thereon in the direction of the circumference of the cage by a crosspiece, the pinion gear having teeth which mesh with at least one set of teeth on the bearing parts of the roller bearing. Stops are provided to limit the motion of the pinion gear.

Abstract: A variable displacement compressor comprises a plurality of pistons revived in a plurality of through-holes formed in a cylinder block arranged in a fixed relationship with a rotary shaft journaled by a stationary part, and a piston drive mechanism including a wobble plate supported on the rotary shaft for wobbling movement. The wobble plate is arranged in opposition to the cylinder block and rotatably holding one ends the pistons.

Abstract: A variable speed pressure energy translating device including a plurality of axially extending pistons and associated cylinders and a yoke engaged by the pistons and pivoted on a transverse axis for varying the displacement thereof, and a housing having spaced saddle bearing seats. The yoke has spaced complementary saddle bearing engaging portions and an arcuate bearing is seated in each of said seats. Each bearing comprises an arcuate body of polymeric material and an arcuate reinforcing member embedded in the body and having a plurality of perforations throughout which are fixed in the reinforcing member with the polymeric material extending through said perforations.

Abstract: The invention relates to a swash plate swivel bearing for a hydraulic axial piston machine, in which roller-bearing segments are arranged between the hollow cylindrical bearing surface for the swash plate in the housing and the cylindrical bearing surface on the swash plate, which segments are held in curved cages with each of which is associated a tracker having a tracking mechanism guided by a guide member in a first guide, which mechanism is in drive connection with a carrier of the cage. It is the object of the invention to design a swash plate swivel bearing of the construction indicated above so that the guide member can cooperate directly with the carrier of the cage.

Abstract: The invention concerns a device for synchronous guiding a roller bearing cage for a roller bearing performing swivel motions, the device comprising a roller cage and bearing parts which swivel relative to one another, the roller cage provided with a pinion gear formed on two diametrically opposed sites with curved toothed segments having different pitch circle diameters, the toothed segments meshing with the teeth of the bearing parts.

Abstract: A nutation frame is mounted on a base at a fulcrum connection for limited angular movement about those axes which are perpendicular to a nutation axis and is restricted against cumulative rotary movement about the nutation axis. The nutation frame rigidly connects reciprocating connections on axes approximately parallel to the nutation axes and radially spaced therefrom and a member designed for circular motion about said axis being axially displaced from said fulcrum. The frame can thus convert circular movement about the nutation axis to reciprocating movement or vice versa.

Abstract: A wobble plate type compressor with a variable displacement mechanism is disclosed. The compressor is provided with a variable angle rotating cylindrical member which is hingedly connected to a rotor. The rotor is fixed on the drive shaft and supports the wobble plate. The cylindrical member is formed with a central hole for receiving the drive shaft. The inner surface of the hole is formed so as to partially contact the drive shaft and restrict the radial movement of the cylindrical member while permitting variance of the angle of the cylindrical member.

Abstract: A vehicle includes at least a pair of drive wheels, each wheel being independently controlled by an integrated transmission, each transmission being powered by an input shaft operably driven by a common engine. Each transmission is of a type wherein a pump head with pistons is driven by the input shaft and conveys output fluid to a motor head which is driven thereby and rotates and output shaft. Pump head output is controlled by an operator variable swash plate. The transmission integrally includes a dampening mechanism for the swash plate, a positive neutral structure for the swash plate, an automatic parking brake with override mechanism to allow setting of the brake or release of the brake by the operator, a porting block communicating fluid flow between the pump heads and providing for overpressure relief, and a charge pump for communicating makeup fluid to the pump head and to circulate the fluid so as to cool same.

Abstract: A vehicle includes at least a pair of drive wheels, each wheel being independently controlled by an integrated transmission, each transmission being powered by an input shaft operably driven by a common engine. Each transmission is of a type wherein a pump head with pistons is driven by the input shaft and conveys output fluid to a motor head which is driven thereby and rotates an output shaft. Pump head output is controlled by an operator variable swash plate. The transmission integrally includes a dampening mechanism for the swash plate, a positive neutral structure for the swash plate, an automatic parking brake with override mechanism to allow setting of the brake or release of the brake by the operator, a porting block communicating fluid flow between the pump heads and providing for overpressure relief, and a charge pump for communicating makeup fluid to the pump head and to circulate the fluid so as to cool same.

Abstract: An adjustable axial piston machine of swash plate construction is provided in which the working pistons are supported against a swash plate that is formed on a rocker body 6, which in turn is supported with a semi-cylindrical support surface against a hollow-cylindrical bearing surface 4, in which case at least one pressure pocket recess 7, 57 is provided for generating a pressure cushion counteracting the bearing loads and it is connected with the high pressure line through channels in the servo piston that is capable of sliding in the operating cylinder loaded with high pressure.

Abstract: A variable stroke axial piston machine having a balance disk that conjointly tilts and is driven with a swash plate to balance a rotating couple induced by the pistons.

Abstract: An adjustable axial piston pump in swash plate design is provided in which the piston support surface (swash plate) is formed in a semi-cylindrical rocker body, whose cylindrical surface is supported in a sliding manner in a hollow-cylindrical bearing box, in which case a pressure pocket recess is provided for hydrostatic relief of the bearing surface and it is connected with a pressure medium source, whereby this axial piston pump has one connection that is always a feed line connection and a second connection that is always a suction line connection and whereby the pressure pocket recess is located only the side of rocker body relative to the axis of rotation of the cylindrical drum on which the working pistons acted upon by feed pressure are supported.

Abstract: Rotary hydraulic actuator comprising a vane (1) which is mounted rotatably and sealingly in a chamber (2) made in a body (3) and on the faces of which a hydraulic fluid pressure is exerted, the vane being fixed mechanically to an element to be driven in rotation; the vane (1) comprises two parts (4, 5) extending radially on either side of its axis of rotation (XX), and these two parts are each movable in a chamber (8, 9) extending over an angular sector less than half a circumference, this chamber being divided into two compartments by the said part (4, 5); the actuator has a hydraulic circuit for feeding the chambers (8, 9), which is designed so as to be capable of driving the vane (1) in rotation in one direction or the other. This arrangement reduces the overall size of the actuator and increases its reliability.

Abstract: A cam plate type axial piston pump capable of operating a control lever operatively connected to a cam plate to control an inclination angle of the cam plate and control its discharge depending on the inclination angle. A piston pump of such type exhibits self-return force toward a position nearer its neutral point when it reaches a position near the neutral point. The pump of the present invention is so constructed that a thrust plate provided on a cam plate is pivotally moved in order to positively utilize the self-return force.

Abstract: A variable displacement compressor comprises a housing forming a crank chamber, a shaft, expansible chambers including pistons, a swash plate connected to the shaft so as to be smoothly changeable in inclination against the shaft and driven to rotate, a wobble plate rotatable on the swash plate, a rotation preventing mechanism including a shoe member slidable in an axial direction, and a pressure control valve which is provided in a refrigerant passage from a suction port of the compressor to the expansible chamber to control the pressure of refrigerant to be sucked responsive to the suction pressure and both to the suction pressure and to the discharge pressure when the discharge pressure is high. The refrigerant passage has a sharply bent portion for separating lubrication oil from a refrigerant flowing therein and communicates with the crank chamber to discharge blow-by gas therefrom.

Abstract: A variable stroke axial piston machine having a balance disk that conjointly tilts and is driven with a swash plate to balance a rotating couple induced by the pistons.

Abstract: The variable capacity swash plate compressor of the present invention includes a rotary swash plate having an eccentric mass located opposite to the driving point of the swash plate with respect to the axis of the same. The mass distribution in the rotary swash plate is established such that, within a range in which the piston stroke is less than a predetermined value, a moment about a pivot point produced by the rotation of the swash plate becomes larger than a moment produced by the reciprocating motion of pistons, piston rods and the like and acting upon the swash plate, while, within a range in which the stroke is larger than the predetermined value, the former moment becomes smaller than the latter moment. Accordingly, it is possible to provide a compressor of the type in which its capacity control characteristics are improved over a wide shaft speed range.

Abstract: A swash plate pump includes a housing and cylinders arranged in a circular pattern around the drive shaft. Piston rods are pivotally connected at one end to the swash plate and mechanism surrounding the drive shaft and axially slidable along it controls the angle of the swash plate. The opposite end of each piston rods is fixed to a piston. In one embodiment, each piston rod is locally reduced in cross-sectional area adjacent its piston to compensate for disparity in arcuate motions of the opposite ends of the piston rod and in another embodiment, the cylinders are mounted in ball joints in the housing to compensate the disparity. One end of the housing may be formed as a manifold and double seals are provided between the compression side and the drive side of the pump.

Abstract: An apparatus for moving a fluid medium comprising a positive displacement member movable to move the fluid medium and a drive mechanism adapted to be driven by a motor for driving the positive displacement member to move the fluid medium. The drive mechanism includes a driving member, a driven member, a resilient coupling and a wobble plate for driving the positive displacement member. The angle of the wobble plate is adjustable by varying the relative angular position of a driving member and a driven member.

Abstract: The heretofore known adjusting device for an axial piston pump/motor of a tilting axis type in which a tilt angle of a valve plate is varied by rocking the valve plate along arcuate guide grooves formed in an end cover of the axial piston pump/motor is improved so as to reduce the size of the adjusting device in the direction of its stroke by assembling a sleeve or sleeves and a piston fitting in the sleeve or sleeves in a telescopic structure within a cylinder formed in the end cover along a rocking direction of the valve plate, and by providing a trunnion pin engaged with the valve plate in the piston.

Abstract: A variable displacement piston pump (10) including a plurality of axially aligned pumping cylinders (24) with a drive shaft (40) extending there between having a tiltable swash plate (30) disposed in a relatively dry cavity at one end of the drive shaft (40) for operating the pumping cylinders, and a reaction thrust plate (38) on the other end of the drive shaft (40), for providing reaction force in the drive shaft (40) opposite that provided by the swash plate (30). An inlet shaft seal (72) prevents fluid, which enters the pump at the inlet port (12), from filling the mounting housing (17) and submerging the mount shaft (44) portion of rotating assembly (16) and its supported swash plate (30). Two needle roller bearings (67) support the swash plate (30) and transmit torque from the drive coupling (19) to the swash plate (30). A high pressure fluid restrictor (70) meters hydraulic control fluid to the two needle bearings (67 ).

Abstract: A thrust hydrostatic bearing device for use in an axial piston machine includes a bearing sleeve fitted into a housing cover for rotatably supporting a drive shaft through a bearing and having a plurality of hydrostatic pads. The hydrostatic pads are disposed at locations which are symmetrical with respect to an axis lying in a cross-section taken perpendicular to the drive shaft, and these pads increase the performance and durability of the thrust hydrostatic bearing device for use in an axial piston machine.

Abstract: A hydraulic or pneumatic oscillating piston motor has a housing (1), a driven shaft (2) mounted in the housing for rotation and an oscillating piston (3) that is fixed to the shaft. The piston has two lever arms (49,8) having pressure areas of different size, which arms are sealed with respect to the housing (1) dividing the housing (1) into two working spaces (4,5) into which a pressure medium can be introduced. The oscillating piston (3), actuated by the pressure medium, is free to oscillate back and forth through a maximum angle of rotation which is determined by means of a stop (38) and the housing. The first lever arm is designated in the form of a bushing (49) whose shell surface along its external periphery is at least partly surrounded by a coaxial shell seal (64). This seal has uniformly distributed, rib-like sealing lips (75) along its periphery and interacts with a opposite surface (9) attached rigidly to the housing (1). The maximum angle of rotation of the oscillating piston (3) is at least 180.

Abstract: A variable displacement compressor has a sleeve axially slidably mounted on an axial drive shaft and a swash plate tiltably connected to the sleeve. The angle of the tilt of the swash plate is variable by an axial movement of the sleeve and a movement of the swash plate along a guiding cam track to vary the compressor displacement. The guiding cam track is provided by a cam groove having a form of a closed loop and formed in a driving plate drivingly connected to the drive shaft and to the swash plate to transmit the torque of the drive shaft to the swash plate. A fulcrum pin is provided on the swash plate and engaged in the cam groove and is movable along the guide groove toward the drive shaft as the angle of tilt of the swash plate is decreased.

Abstract: The invention relates to an adjustable axial piston engine having spaced apart end walls with a shaft extending between the end walls. A rotary carrier is attached to the shaft adjacent one of the end walls and an oblique adjusting plate is mounted adjacent the other end wall. A piston-cylinder unit extends between the carrier and the oblique plate. A pivot axis for the oblique plate includes a bearing arrangement between the plate and the adjacent end wall. A servo unit for adjustably rotating the plate about the pivot axis is provided between the plate and the adjacent end wall. The piston-cylinder unit is carried by the carrier and is slidably engageable with the oblique plate. Flanges are provided for the piston-cylinder units which are spring biased into engagement with the oblique plate via a spring biased pressure plate.

Abstract: A seal arrangement for use in a rotary actuator having a housing and an end wall where a shaft extends through an aperture in the end wall and and carries a vane, a stator assembly is provided and directly inwardly from the housing having an end edge in adjacent relation with the end wall and a longitudinal edge adjacent the shaft. A groove is provided extending longitudinally along the end edge and the longitudinal edge and is adapted to receive a generally rectangular stator seal member so the stator seal member end edge abuts the end wall to provide a fluid seal therebetween and where an annular groove is provided around the shaft receiving aperture and is adapted to receive a generally circular ring seal. The generally circular "O" ring seal includes a tab member having a thickness less than the thickness of the "O" ring member and the tab extends radially outwardly from the "O" ring member parallel to the groove of the end edge to engage the stator seal member.

Abstract: A hydraulic transmission device operable to translate hydraulic energy into mechanical energy and vice versa. The device has a housing 14 having a close end portion and an open end portion in the longitudinal direction. The housing supports therein a drive shaft 11, a retainer 12, and a cylinder block 13 which have an integral structure. A recess is formed at a substantially central location of the end surface of the cylinder block 13 that is on the side of an open end of the housing, and a cover 15 closing the open end of the housing has a protruding portion 15A which extends through a port plate 23 to be engaged with the recess of the cylinder block through a bearing 17. A plurality of pistons are disposed in the cylinder block and are kept in tight engagement with a swash plate fixed to the closed end portion of the housing at a constant tilt angle. The device acts as either a swash plate type axial piston pump or motor of this type as the drive shaft rotates.

Abstract: A hydraulic radial piston machine with steplessly adjustable volumetric displacement and piston stroke has a bank of pistons with axes in a common plane transverse to the shaft and machine axes. A radially displaceable supporting member pivotably connected to a shaft longitudinal portion turnable from the machine longitudinal axis supports the pistons. The longitudinal portion is pivotably connected at one end to a further longitudinal shaft portion. The second end connects to a turning link transmission which rotates. Rotation of the first--mentioned longitudinal shaft portion causes the supporting member to travel a circular path around the machine axis. A force--loaded translating operating displacing member steplessly varies the diameter of this circle to steplessly adjust piston stroke.

Abstract: A switching valve device provided in an oil passage in which the flow of oil pressure is supposed to occur in both directions, the switching valve device having two check valves provided in the oil passage so as to allow a flow of oil pressure in respective directions opposite to each other, the check valves being biased by means of springs in their respective closing direction, and means is provided for forcibly open the check valves against the bias of the springs. Thereby the switching valve device selectively assumes a first state which allows a flow of oil pressure in one direction, a second state which allows the flow in the other direction, and a third state which does not allow such flow in any direction.

Abstract: An hydraulic rotation damper comprises a bearing housing with inner stator vanes and a rotor with rotor vanes, the rotor being arranged on a carrier arm journal which is mounted in bearings in the bearing housing with the stator vanes and the rotor vanes forming working chambers. At least one damping valve is provided for transferring working medium from pressure-loaded working chambers into unloaded working chambers. Further, the working chambers are closed at both ends by end walls containing valve-controlled passages leading into annular gaps which are separated by the end walls from the working chambers. This permits pressure medium at a pressure corresponding to the working pressure in the respective working chambers to be fed to the annular gaps where the pressure medium applies pressure to the outer surfaces of the end walls of the working chambers to prevent axial displacement of those walls.

Abstract: A variable displacement wobble plate compressor with a guide unit for a wobble plate, having a cylindrical guide rod axially extending in the compressor in parallel with a compressor drive shaft, a slide slidably and rotatably fitted on the guide rod and provided with lateral pivots on laterally opposite sides thereof which extend in a direction at a right angle to the axis of the guide rod, and a pair of shoes pivotally engaged with the pivots of the slide and slidably received in a radial recess formed in a lowermost portion of the wobble plate. Each of the shoes has a semi-cylindrical outer face complementary with a semi-cylindrical concave wall of the radial recess of the wobble plate so as to permit a relative turning of the wobble plate to the shoes. The slide and shoes may have oil passageways and/or oil grooves.

Abstract: The invention relates to an adjustable axial piston engine having spaced apart end walls with a shaft extending between the end walls. A rotary carrier is attached to the shaft adjacent one of the end walls and an oblique adjusting plate is mounted adjacent the other end wall. A piston-cylinder unit extends between the carrier and the oblique plate. A pivot axis for the oblique plate includes a bearing arrangement between the plate and the adjacent end wall. A servo unit for adjustably rotating the plate about the pivot axis is provided between the plate and the adjacent end wall.

Abstract: This invention relates to an axial piston system hydraulic pump or motor capable of being changed over by two stages and particularly preferably used as the hydraulic motor for driving vehicles such as bulldozer, shoveldozer, etc. Thus, to provide as compact as possible two step changing-over mechanism and a well-balanced operation with a relative small force, a smooth plane against which the shoe at the plunger side opposed to a swash plate abuts and a first and second abutting portions located at the opposite plane to the smooth plane to abut against a fixed portion, when the swash plate pivots about the center of pivotal movement, to regulate the angle of said smooth plane of the swash plate to two positions are formed while a drive member is disposed which pivots said swash plate about the center of the pivotal movement to displace the angle of the smooth plane to two positions.

Abstract: A variable displacement swash plate type compressor having a cylinder block in which a drive shaft is centrally and axially extended so as to mount thereon a swash plate assembly to drive pistons reciprocally arranged in a plurality of cylinder bores arranged circumferentially about the drive shaft. The swash plate assembly has a rotary swash plate and a non-rotary wobble plate in a crankcase formed in the cylinder block and a mechanism for changing the wobble angle of the swash plate and the wobble plate by turning them about an axis extending at a right angle to the rotating axis of the drive shaft and passing through points which come into registration with respective centers of connection of connecting rods of the pistons and the wobble plate when the pistons are at the top dead center of their strokes within the cylinder bores.

Abstract: The invention is directed to a unitary cage assembly annularly positioning a plurality of rollers in a pair of roller bearings supporting a cradle swashplate. By utilizing the unitary cage assembly, a parallel relationship between the rollers is assured and, furthermore, only a single locating mechanism for the unitary cage assembly is required.

Abstract: An axial piston machine of the skew axis type with at least two independent working streams is described. In this at least two groups of working pistons are arranged in cylinder bores, each on a circle, whereby each group of working pistons delivers an independent working stream or provides a working stream with medium. Such an axial piston machine is constructed as a machine in which the delivery volume is continuously adjustable, and in which the angle of inclination of the cylinder drum can be changed by means of an adjusting mechanism. The entrainment of the cylinder drum only takes place through one of the groups of working pistons.

Abstract: A novel rotary actuator utilizes viscosity of the oil and prevents the oil leakage, without using the sealing member to the vane. The instant device installs the flanges in parallel and fixes the vane therebetween, and sets within the cylinder the rotor keeping the stopper therebetween, not fixing it, and the radial bearings at both sides of the cylinder to support the stopper, whereby a fine clearance is maintained between the flange and the inner wall of the cylinder. The rotor is formed in order of machining into flanges, small diameter portions and a rotary shaft. The vane is formed by cutting the material of doughnut shape into a sector.

Abstract: The invention relates to a swashplate leveling and holddown mechanism wherein an axially sliding leveling mechanism is biased into engagement with a swashplate of an axial piston variable displacement hydraulic unit to position the swashplate in a zero displacement position when there is no control input to the hydraulic unit. The leveling mechanism has a pair of contact points, one positioned on each side of the swashplate tilt axis in a manner that both contact points positively engage the swashplate when it is centered to its zero displacement position. Such mechanism requires no spring adjustment and has no backlash. Furthermore, the axial bias on the leveling mechanism helps seat the swashplate in its support bearings. Utilized in conjunction with the leveling mechanism is an axially biased control input which operates on the opposite side of the swashplate to further hold the swashplate in its support bearings.

Abstract: The invention relates to a hydrostatic axial piston machine (1) having a cylinder drum (9), rotating in a housing, which cylinder drum receives pistons (12) arranged on a pitch circle, and having an inclined disc (16) which pivots, in a pivot, about a swivelling axis (21) which extends eccentrically to the pitch circle, which pivot is formed by at least one bearing (23) having a bearing surface (26) which is free in the direction of the pistons (12), the inclined disc (16) being arranged loosely between the bearing (23) and the pistons (12) and being pivotable by means of an adjusting member (28). The aim of the invention is to develop the axial piston machine so that, while ensuring a simple structural design sign and simple assembly and dismantling of the inclined disc (16) and of the adjusting member (28), defined limitation of the adjusting movement of the inclined disc (16) in the direction of zero position or minimum delivery is possible.

Abstract: An axial piston machine of the inclined axis type is operable as a pump or motor has a drive shaft, a drive plate rotatable with the drive shaft, a machine housing, a drum having cylindrical bores inclined to the axis of rotation of the drive plate, pistons reciprocally mounted in the bores and connected to the drive plate, and an axial slide bearing and a radial slide bearing arranged in the housing to provide axial and radial support for the drive plate, in which an improved radial slide bearing comprises a circumferentially spaced arrangement of pressure chambers formed in the outer periphery of the drive plate each corresponding to a respective one of the cylindrical bores, the pressure chamber opening outwardly of the drive plate to form a hydrostatic and a hydrodynamic radial slide bearing with an adjacent internal bearing surface of the housing.

Abstract: A fluid device of the axial piston type having high and low pressure operating passages, one of which may be an inlet and the other an outlet depending upon the pumping or motoring function of the device. The fluid device which may be of the fixed or variable displacement type has a rotatable cylinder barrel with each end of a plurality of pistons disposed for reciprocation within cylinder bores in the cylinder barrel, and cylinder ports successively communicating each of the cylinder bores with arcuate inlet and outlet passages formed in a valving face disposed at one end of the cylinder barrel. The other ends of the pistons are drivingly engaged by an inclined thrust plate assembly disposed to impart a reciprocal stroking movement to the pistons within the cylinder bores as the cylinder barrel is rotated.

Abstract: A fluid device of the axial piston type having high and low pressure operating passages, one of which may be an inlet and the other an outlet depending upon the pumping or motoring function of the device and the direction of rotation. The fluid device, which is of the variable displacement type, has a rotatable cylinder barrel with one end of each of a plurality of pistons disposed for reciprocation within cylinder bores at one end of the cylinder barrel, and cylinder ports successively communicating each of the cylinder bores with arcuate inlet and outlet passages formed in a valving face disposed at the opposite end of the cylinder barrel. The other ends of the pistons engage a pivotably mounted thrust plate adapted to impart a reciprocal movement to the pistons within the cylinder bores as the cylinder barrel is rotated.