Abstract: The invention concerns a hydraulic axial piston machine (1) with a cylinder body (3), at least one piston (9) to be axially displaceable in the cylinder body (3), said piston (9) resting on a swash plate (13) by way of a slide shoe (11), with a pressure plate (14) loading the slide shoe (11) in the direction of the swash plate (13), and a hold-down part (16), which bears with a contact surface (18) on a counter surface (20) of the pressure plate(14) facing away from the swash plate (13). It is endeavored to operate the machine with as little wear as possible. For this purpose, it is ensured that the contact surface (18) is formed by a circumferential surface section of a cone, whose peak (19) is directed towards the swash plate (13).

Abstract: The present invention provides a tandem pump unit that includes: a first hydraulic pump and a second hydraulic pump respectively having a first pump shaft and a second pump shaft respectively having adjacent ends connected together so that the first and second pump shafts are coaxially aligned and non-rotatably connected in tandem; a common housing for accommodating the first hydraulic pump and the second hydraulic pump; and a first center section and a second center section that respectively support the first and second hydraulic pumps.

Abstract: A dual pump apparatus for use on a vehicle or industrial application having a housing in which a plurality of hydraulic pumps are mounted and driven by a prime mover. The prime mover is drivingly coupled to a main input shaft, which drives the hydraulic pumps. An auxiliary pump may be drivingly coupled to the main drive shaft and a power take off unit may also be connected thereto. The power take off unit may be driven by a hydraulic motor.

Abstract: A compressor for a vehicle air conditioning system comprises a front casing in which is mounted a swash or wobble plate arrangement operatively connected to a drive shaft and a plurality of pistons each provided with a piston body at one end and a foot portion at its other. A cylinder block is also provided defining a plurality of cylinder bores equally distributed circumferentially around the drive shaft, in each of which bores one of the piston bodies can be reciprocated by the swash or wobble plate, as the drive shaft rotates. The inner wall surface of the front casing defines a plurality of longitudinally extending recesses in positions apposed to each piston. The piston body and the foot portion of each piston are connected by a bridge that is bending resistant and projects outwardly into these apposed recesses. Also, at least one side of the bridge is provided with a laterally projecting wing that supports the piston against the adjacent inner wall surface of the front casing to one side of the recess.

Abstract: An axial piston micropump is disclosed, having a cylinder drum, in which several cylinders are provided a swash plate, with respect to which the cylinder drum is rotatable. It is desirable for such a micropump to have a small displacement combined with a long service life and in which the displacement or delivery volume can be achieved with great accuracy. For that purpose, at least two cylinders are provided, of which at least one is in the form of a working cylinder which has an associated working piston, while at least one other cylinder is in the form of a balance cylinder and has an associated balance piston.

Abstract: The axial piston machine comprises a case, a shaft and a cylinder block (2), arranged so as to rotate in the case and having a plurality of cylinders (21) with pistons, adapted to slide in said cylinders and connected to piston rods (6) by means of first spherical joints, the piston rods being connected to a sliding plate (7) by means of second spherical joints (63), said sliding plate (7) being supported by a swash plate (8) via a bearing (72). For the connection between a piston rod (6) and the sliding plate (7), the machine further comprises a first driving rotational surface (61) linked to the piston rod (6) and a corresponding second driving rotational surface (71) linked to the sliding plate (7), a clearance being left between said first driving rotational surface (61) and said second driving rotational surface (71) and said surfaces being adjacent.

Abstract: A charge pump design for a hydraulic drive apparatus such as a hydrostatic transmission, integrated hydrostatic transaxle or pump having a rotatable pump cylinder block mounted in a sump and connected to a hydraulic circuit by means of a center section or the like. A fluid gallery for charge fluid is in communication with the hydraulic circuit and the charge pump is mounted adjacent to and is driven by the pump cylinder block to provide hydraulic fluid from the sump to the fluid gallery. The charge pump can be of many different styles such as a gerotor, a centrifugal pump or a flexible impeller style.

Abstract: An axle driving apparatus having a housing having two members joined along a joint surface and a hydraulic axial piston pump and motor mounted on a center section located in the housing, wherein the pump and motor are mounted perpendicular to one another. The motor is engaged to a fixed thrust bearing located in the housing and the center section is located entirely between the joint surface and the thrust bearing.

Abstract: Smaller and lighter hydraulic pump/motors provide remarkably improved volumetric efficiency with pistons having body portions substantially as long as the axial length of the respective cylinders in which they reciprocate. A plurality of respective lubricating channels form a single, continuous lubricating passageway entirely within the cylinder block and not connected by either fluid “input” or fluid “output” passageways, being replenished solely by a minimal flow of fluid to and from the valve end of each cylinder and passing between each respective cylindrical wall of each cylinder and the axial cylindrical body of each respective piston. Several embodiments are disclosed in combination with various spring-biased hold-down assemblies. The preferred embodiment included a fixed cylinder block, a roller bearing mounting between the wobbler and rotor of a split-swash plate, with piston shoes contacting the wobbler directly without any intermediary apparatus.

Abstract: A hydrostatic cylinder block having a split cylinder block with a slipper hold-down created by breaking down the cylinder block into its basic geometries through near net shaping technology. The cylinder block is broken down into four separate components: a hub, a wave spring, a cylinder block body, and a base plate. Each component is created using near net shaping technologies. The geometries are then placed together to create the completed cylinder block wherein the wave spring separates the hub from the block body to provide an improved slipper hold down force.

Abstract: An arrangement structure of a swash plate hydraulic pump which can be used in a wide range of construction equipment and industrial vehicles and is small in size, simple in structure, and inexpensive is provided. For this purpose, an arrangement structure of a swash plate hydraulic pump (1) comprises a driving source (3) and a plurality of swash plate hydraulic pumps (4, 8) which are connected to the driving source and discharge pressurized oil, and the plurality of swash plate hydraulic pumps include at least one swash plate hydraulic pump (8) of the second and subsequent swash plate hydraulic pumps which has a driving shaft (9) provided on a plane almost perpendicular to a driving shaft (6) of the first swash plate hydraulic pump (4) coupled to the driving source.

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 center section and second housing element form a gear cavity in which gears to connect the two pump input shafts are located. Various charge pumps or auxiliary pump configurations are disclosed, including one embodiment where the input shaft gears themselves may act as a charge pump for the pump assembly.

Abstract: A pump includes a stationary pump housing having a central longitudinal axis and a housing chamber, a rotating pump shaft extending through the pump housing and into the housing chamber, a rotating barrel fixed to the pump shaft and including a plurality of pump chambers, and a plurality of rotating and reciprocating pump pistons. Each pump piston is at least partially contained within a respective pump chamber. A fluid delivery control assembly is provided to selectively vary the amount of fluid delivered by the pump. At least one pressurized fluid pool is located between a portion of the rotating barrel and a portion of the pump housing. The pressurized fluid pool may be located along an end surface of the rotating barrel and/or along a side of the rotating barrel.

Abstract: A hydraulic transformer wherein a multiplicity of displacers are guided in a displacement member. The stroke of the displacers is determined through the intermediary of a cam element, with pressure medium supply and discharge being controlled through the intermediary of a control member having at least three control grooves. In accordance with the invention either the displacement member or the cam element or the control member may be driven, whereas—depending on which component is driven—the cam element or the displacement member is mounted so as to be freely adjustable, and the remaining third component is accommodated integral with the housing.

Abstract: A hydraulic transmission having a hydraulic pump, a hydraulic motor and a center section having a pump running surface on which the hydraulic pump rotates and a motor running surface of which the hydraulic motor rotates. The center section has porting by which the hydraulic pump and the hydraulic motor are in fluid communication wherein the porting terminates in a pair of equidistantly spaced, generally arcuate shaped openings. The pump running surface includes a plurality of generally v-shaped grooves extending from each of the ends of the generally arcuate shaped openings.

Abstract: A swash type compressor includes sleeves which are fixedly fitted in cylinder bores. The lengths of the sleeves in an axial direction are greater than the lengths of the cylinder bores in the axial direction. A sleeve end of each of the sleeves is flush with an end surface of a cylinder block defining the cylinder bores. The opposite sleeve end of the sleeve extends beyond the cylinder bore and away from the opposite end surface of the cylinder block.

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: The invention relates to a subassembly, consisting of a drive shaft (12), a housing (10) with a through-bore (19), through which the drive shaft projects out of the housing and an axial mechanical seal consisting of a rotating seal ring (22) and a counter-ring (20) which forms a seal between the drive shaft (12) and housing (10) components. The invention aims to improve the assembly of the axial mechanical seal and the thermal dissipation from said mechanical seal. To this end, the counter-ring (20) is configured as one single piece with one of the two components (10, 12). This obviates a separate assembly of the counter-ring and allows the heat produced by friction to be dissipated directly into one of the two components.

Abstract: A rotary valve of a rotating fluid machine includes a moving valve plate disposed on a rotor, a stationary valve plate which is disposed on a valve body engaged with a rear cover to be unable to rotate and movable in the direction of the axis of the rotor, the two plates being brought into contact with each other on sliding faces orthogonal to the axis. Three engaging pins are planted on the inner face of the rear cover so as to surround the axis in parallel to the axis. The engaging pins are slidably fitted into pin holes formed in a back face of the valve body. This configuration enables the valve body to move in the direction of the axis to bring the sliding faces into close contact with each other, and enables the valve body to oscillate around the axis, thereby enhancing the compliance of the sliding faces and preventing leakage of a working medium.

Abstract: A rotary valve of a rotating fluid machine is constructed by bringing into contact, on sliding faces which are orthogonal to an axis, a moving valve plate provided on a rotor and a stationary valve plate provided on a valve body. An annular member pivotably supports the valve body by a fulcrum shaft. The annular member has a pair of projections at its two ends. The pair of projections are engaged slidably in the direction of the axis with a pair of guide grooves formed in a rear cover. When the valve body is pressed in the direction of the axis to bring the sliding faces into close contact with each other, the pair of projections receive a uniform frictional resistance from the guide grooves, so that the annular member is prevented from inclining off a plane orthogonal to the axis. Therefore, the compliance of the sliding faces can be secured to prevent a working medium from leaking and to suppress uneven wear of the sliding faces.

Abstract: In a seal mechanism which constitutes a port switching portion in a pump mechanism of a paste ejection apparatus that ejects paste, and which prevents leakage of the paste from a seal portion between a plunger block rotating with a plunger and a fixed seal block (between a seal surface and a sliding surface), a housing portion is formed by opposing an outer surface provided for the seal block to an inner surface extending axially from the cylinder block, and a ring-shaped external seal member formed by combination of an O-ring and self-lubricant material such as PTFE is attached into the housing portion. Hereby, it is possible to prevent the paste that has leaked from the seal portion from leaking to the outside of the housing portion by the external seal member.

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 expander includes a rotor rotatably supported by a casing, a group of axial pistons and cylinders installed so that its axis is surrounded by the rotor, and a swash plate having a rotating surface inclined with respect to the axis of the rotor and is rotatably supported by the casing. The relative rotation of the swash plate and the rotor around the axis is restricted and the relative shifting of the swash plate and rotor in the direction of the axis is allowed, by fitting a slider, fixed to the swash plate by a synchro-pin, into a long hole of an output shaft. Therefore, it is possible to prevent wrenching between the swash plate and the rotor due to thermal expansion while reducing the bending moment acting on the pistons of the group of axial pistons and cylinders of the expander.

Abstract: A method of making a cylinder block for a rotatable hydrostatic power member by separating the cylinder block into its four geometries and joining them together. The geometries include a base plate having a center opening and a arcuate kidney-shaped openings uniformly spaced radially around the center opening. The second geometrical item is a grooved drive shaft that fits into the center opening of the base plate. The third member is a group of tubular bore elements that fit in the base plate and mate with the drive shaft. The final member is a torque ring that matingly fits over the tubular piston bore elements.

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: An energy exchanger device can be used for exchanging pressure energy from one fluid to another, or may act as a hydraulic compressor or fluid driven pump. A preferred device uses a jet nozzle to rotate a cylindrical rotor block having a number of axially oriented conduits within it. As the rotor turns, one end of each of the conduits is alternately connected, through a first set of ports, to either an inlet for a high pressure fluid, or an outlet for the high pressure fluid from which the energy has been extracted. Correspondingly, the other end of each of the conduits is alternately connected to either an inlet for a low pressure fluid or an outlet for the fluid to which the energy has been transferred. A freely sliding element, such as a ball, may be placed in each of the conduits to isolate the two fluids from each other.

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: In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, including a machine shaft, a plurality of pistons are arranged, at the same distance from the machine shaft, on a cylinder envelope defined by the axes of the pistons and extending around the machine shaft, and an annular pivoting disc which is driven by the machine shaft and which engages the pistons via a joint arrangement, the joint arrangement has an at least partially spherical receptacle, in which at least one sliding element structure is arranged moveably relative to the associated piston and relative to the pivoting disc, including a first sliding element having a first sliding face in the form of a spherical segment with a first geometric center (M1, M3), and a second sliding element having a second sliding face in the form of a spherical segment with a second geometric center (M2, M4) arranged at a distance from the first geometric center.

Abstract: In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, including a machine shaft rotatably supported in a housing, a plurality of pistons arranged circularly around the machine shaft in the housing, and an annular pivoting disc driven by the machine shaft and engaging the pistons via a joint arrangement, the pivoting disc being connected in an articulated manner to the machine shaft via a driver for transmitting the machine shaft drive forces to the pistons and mounted on a machine shaft-supported sliding body so as to be pivotable about a hinge axis oriented transversely to the machine shaft, the sliding body has an elongated recess which is open at one axial end for receiving the driver and the sliding body further includes at its inside adjacent the machine shaft a cavity, which is in communication with a bore forming a discharge passage extending through the machine shaft.

Abstract: In a swash-plate compressor for compressing a fluid, the compressor includes a cylinder block having a cylinder bore and a piston having a first end portion reciprocally movable in the cylinder bore and a second end portion opposite to the first end portion. The second end portion has a pair of engaging portions faced to each other with a space left therebetween and a side wall portion connecting the engaging portions to each other. The compressor further includes a swash plate having a part inserted between the engaging portions and driven to rotate and a pair of sliding members interposed between the engaging portions and the swash plate, respectively. Each of the sliding members has a flat portion slidably contacted with the swash plate and a spherical portion opposite to the flat portion. Each of the engaging portions has a contact surface slidably contacted with the spherical portion. Each of the contact surfaces extends to the side wall portion.

Abstract: A swash plate compressor comprises a swash plate located for rotation in a housing and a compression unit that forms a part of the housing. The compression unit has cylinder bores that guide pistons in reciprocation as the swash plate rotates. Each cylinder bore has a cross section formed of any other closed curve than a circle. The closed curve is defined by curve elements and straight elements.

Abstract: A support structure carrying a thrust load of a compressor has a swash plate which contributes to a compressing operation by rotating according to rotation of a rotating shaft which is rotatably supported by a housing. The swash plate is rotatably supported with respect to the housing, and the support structure includes a thrust needle roller bearing having double-row needle rollers. The support structure carrying a thrust load of a compressor and the thrust needle roller bearing are thus obtained, with an improvement in inflow and outflow of a lubricating oil, a reduction of the differential slip of the needle rollers, and an improvement in strength durability.

Abstract: The present invention provides a tandem pump unit that includes: a first hydraulic pump and a second hydraulic pump respectively having a first pump shaft and a second pump shaft respectively having adjacent ends connected together so that the first and second pump shafts are coaxially aligned and non-rotatably connected in tandem; a common housing for accommodating the first hydraulic pump and the second hydraulic pump; and a first center section and a second center section that respectively support the first and second hydraulic pumps.

Abstract: Downsizing a piston stroke dimension in a compressor that reciprocates pistons is accomplished by changing a radial directional component of a shaft of a motion that is transferred to a link from a revolving member revolved by the shaft when transferred to the link attached to the pistons. Thereby, when the revolving member, driven by a shaft, revolves once, a center of a sliding pin appears to reciprocate once in a vertical direction as it goes back and forth on both sides interposing a piston axial line. Thus, when the revolving member revolves once, the piston reciprocates twice in a cylinder bore in a direction parallel to the longitudinal direction of the driving shaft.

Abstract: A variable displacement piston compressor comprising a housing and a shaft supported within the housing for rotational movement about an axis. The shaft includes a stepped down portion defining a reduced diameter within the shaft. A pin extends generally outward from the shaft and includes a distal end. A sleeve is mounted about the shaft, is slidable along the shaft, and is rotatable with the shaft. The sleeve extends over a portion of the stepped down portion of the shaft and defines a radial gap between the sleeve and the stepped down portion. A swash-ring is supported on the sleeve and is rotatable with the shaft. The swash-ring is pivotably coupled to the distal end of the pin. The swash-ring defines an angle with the axis that is adjustable with respect to the axis. A biasing member engages the sleeve and biases the sleeve along the shaft.

Abstract: A piston engine in the form of a piston pump or a piston engine (motor) comprises two or more piston cylinders (14b, 14c), preferably positioned with the same angular distances of 180 degrees for two cylinders, 120 degrees for three cylinders etc. with regards to an axis, and each comprising a reciprocating piston with a projecting piston rod (18b, 18c). Via the piston rods (18b, 18c), each piston is given a controlled displacement matched to the controlled, given displacement of another or other pistons. The control means is rotatable and influences the projecting outer end portions of the piston rods or parts fitted to these, for instance rotatable rollers (20b, 20c). By a piston pump of this type, the pistons are to contribute to impelling a fluid flow, while a piston engine of this type shall be designed to be driven by a fluid flow. Operating conditions are aimed at which give a more even volume flow, i.e. without any significant fluctuations.

Abstract: A hydraulic transmission having a hydraulic pump, a hydraulic motor and a center section having a pump running surface on which the hydraulic pump rotates and a motor running surface of which the hydraulic motor rotates. The center section has porting by which the hydraulic pump and the hydraulic motor are in fluid communication wherein the porting terminates in a pair of equidistantly spaced, generally arcuate shaped openings. The pump running surface includes a plurality of generally v-shaped grooves extending from each of the ends of the generally arcuate shaped openings.

Abstract: A dual pump apparatus for use on a vehicle or industrial application having a housing in which a pair of hydraulic pumps are mounted, having by at least one charge pump mounted on an end cap, and the trunnion arms for controlling the hydraulic pumps extending out of opposite sides of the housing. A cooling fan may be mounted on the primary or secondary input shaft on the opposite side of the pulley used to engage the prime mover. An auxiliary pump may also be mounted on the primary input shaft and may be located either at the input end thereof adjacent to the pulley, or on the opposite side of the housing.

Abstract: A positive displacement hydraulic pump/motor assembly (1) includes a rotary cylinder block (3) having a central axis (5) and a generally circular array of cylinders (6) disposed in parallel relationship around the axis. A corresponding plurality of axial pistons (10) is reciprocably disposed within the respective cylinders. A drive shaft (12) effects rotation of the cylinder block about the central axis and a drive plate (15) is disposed at one end of the cylinder block (3) to effect sequentially staggered reciprocation of the pistons (10) in response to rotation of the cylinder block. A stationary valve plate (20) is disposed at an opposite end of the cylinder block. The valve plate (20) includes a valve face (21) adapted for sliding rotational engagement with a complementary mating face (22) formed on the cylinder block.

Abstract: A rotary slant shaft type gas compressor having a multi-stepped exhaust system is provided, which includes: a driving shaft fixed with a cylinder head formed with gas holes; a gas guide member for intake of gas and discharge of compressed gas; a case head member coupled with the driving shaft and formed with an intake port and three exhaust ports; a valve plate member fixed on an inner surface of the case head member to contact an outer surface of the cylinder head, and formed with a gas intake valve groove and three gas exhaust valve grooves; a cylinder block formed with cylinder bores, integrally coupled with the cylinder head, and slidably inserted by pistons; and a swivel plate member connected to the cylinder block and the pistons and converting the rotation force to reciprocation motion.

Abstract: A hydrostatic axial piston machine has a cylinder block with bores holding reciprocating pistons, a swashplate supporting the pistons, and control cams to supply the bores with hydraulic fluid. The swashplate is a pivoting cradle mounted on friction bearings in a cradle receptacle. Hydraulic fluid channels empty into the cradle receptacle and are in communication with supply channels in the cradle connected to the control cams. An actuator piston to adjust the cradle is located between two friction bearing segments of the cradle receptacle and has a toothed rack segment engaging a gearing segment on the back side of the cradle.

Abstract: A housing assembly for a refrigerant compressor in an air conditioning system includes a forward housing portion, and a rearward housing portion. The two mate together to contain the internal components and seal the compressor. A clamp engages the forward and the rearward housing portions and is rotated to compress the two together. It maintains a desired clamping force under various operating and environmental conditions.

Abstract: The invention relates to a hydraulic device provided with a housing having at least a first line connection and a second line connection and, if appropriate, further line connections, a rotor which can rotate in the housing and chambers which are alternately connected to one of the line connections as a result of the rotation of the rotor. According to the invention, chambers are connected by connecting lines in which there are means for closing the connecting line after a limited volume of fluid has flowed through the connecting line in one direction.

Abstract: In a fluid apparatus used as a compressor, a swing support member is constructed of a hook-type adjustable joint, and supports a swing member in capable of swinging while restricting the swing member from rotating about a center axis of a shaft of the compressor. A variable mechanism portion is constructed of a rotary member rotatable around the shaft, the swing member and the like. A slant center around which the swing member swings is made to substantially correspond to a center of gravity of the variable mechanism portion. Therefore, a slant moment, for changing a slant angle of the swing member, is not structurally generated. Accordingly, even when the compressor operates, large vibration and large noise can be prevented, thereby improving durability of the compressor.

Abstract: The invention relates to a hydraulic device as a pump or a motor, having a rotor which is coupled to the shaft, chambers with a volume which, on account of the rotation of the rotor, varies between a minimum value and a maximum value, switching means for successively connecting a chamber to a first line connection and the second line connection during rotation of the rotor. During switching of the connection by means of the switching means, the volume of the chamber changes, and to avoid pressure peaks or cavitation, there are connecting lines between the chambers. The connecting lines are provided with closure means which close the connecting line after a limited volume of fluid has flowed through the connecting line in one direction.

Abstract: The invention concerns a water-hydraulic machine with at least two mutually movable parts, of which one has a surface of a plastic material with friction-reducing properties. In such a machine it is desired to enable the use of demineralised water. For this purpose, it is ensured that a layer of a carbon-containing material is arranged between the plastics material and the other part.

Abstract: A pump includes a pump housing that defines an inlet and an outlet. Within the pump housing, there is a barrel that is adjacent to at least one reciprocating piston. A sleeve surrounds the annular outer surface of the piston and is movable. The temperature change within the pump is compensated for by making at least one of the sleeve and the barrel of a material with a lower coefficient of thermal expansion than the material of the piston. A clearance defined by an inner surface of the sleeve and the annular outer surface of the piston increases when the temperature is low and decreases when the temperature is high.

Abstract: A shoe in a swash plate type compressor has a spherical engaging surface that engages with a piston, and a plane engaging surface that is substantially a plane and engages with a swash plate. The plane engaging surface includes a substantially planar sliding surface, a substantially radially extending peripheral surface and a connecting surface. The sliding surface is formed near a center of the plane engaging surface and slides over the swash plate. The peripheral surface is formed near a periphery of the plane engaging surface, is formed at a distance from the sliding surface away from the surface of the swash plate so as to form an inwardly-directed step in the plane engaging surface, and is connected to the spherical engaging surface at its outer periphery. The connecting surface connects the sliding surface to the peripheral surface.

Abstract: In a hydraulic pump assembly, an annular sleeve member is radially interposed between an outer peripheral surface portion of an input shaft and an inner peripheral surface portion of a cylinder block or barrel within which are provided a plurality of piston cylinders for accommodating a plurality of pumping pistons. The outer peripheral surface portion of the input shaft includes an outer peripheral splined section, and the inner peripheral surface portion of the cylinder block or barrel includes an inner peripheral splined section. The annular sleeve member is provided with the inner peripheral splined portion for splined engagement with the outer peripheral splined portion of the input shaft and with the outer peripheral splined portion for engagement with the inner peripheral splined portion of the cylinder block or barrel. In this manner, a dual splined interconnection system is defined between the input shaft, the annular sleeve member and the cylinder block or barrel.

Abstract: This invention pertains to a continuously variable differential transmission utilizing an axial array of dampers to induce and control the gyration frequency of a precessing plate.