Abstract: A bent axis pump/motor includes a back plate positioned within a casing, and a check valve positioned in the back-plate, the check valve configured to control passage of fluid from within the casing to an interior of the back plate. A yoke, coupled to the back plate, includes trunnions, positioned within respective apertures in the casing, upon which the yoke rotates. Bearings, occupying less than the complete circumference of the respective trunnion, are positioned between each of the trunnions and respective inner walls of the apertures. Trunnion apertures, for passage of fluid, are positioned in a portion of the circumference not occupied by the respective bearing. A valve positioned within the casing selectively couples high- and low-pressure fluid to the trunnions. Fluid supply channels, formed integrally with the casing, transmit fluid from the valve to the trunnions via fluid apertures provided within the apertures in the casing.

Abstract: Hydraulic device driving a rotating receiver such as a shaft (1) includes at least one hydraulic motor having axial pistons (7) bearing against a fixed swash-plate (9) via shoes (10), the pistons (7) being arranged in a rotating barrel (5), characterized by the fact that the motor shaft (1) carries a toothed crown wheel (2) with which it is integral whose teeth are engaged by teeth (4) provided on the periphery of the rotating barrel (5) of one or more hydraulic motors (7) arranged around the shaft (1), the axis of axes of the barrel (5) being parallel to the axis of the shaft (1).

Abstract: A compressor assembly comprising a housing having a shaft bore therein, a main shaft positioned for rotation within the shaft bore, at least one roller thrust bearing and a thurst surface bearing clip. The thrust surface bearing clip comprises a first position configured for fixed engagement with the housing and a second portion extending from the first portion and configured for supporting a thurst surface in a position spaced from the rotating shaft, the thrust surface providing a bearing surface for the roller thrust bearing.

Abstract: A fluid machine for a gas compression refrigerating system comprises a first and a second working for performing a pump mode operation, in which working fluid of low pressure is sucked into and compressed by the working chambers. The fluid machine further comprises valve mechanism for selectively forming a motor mode passage in combination with a fluid passage change-over device, so that super heated working fluid of high pressure is introduced into at least one of the working chambers to perform a motor mode operation, in which the high pressure working fluid is expanded in the working chamber to obtain mechanical energy. The fluid machine according to the invention, therefore, performs the pump mode operation at one of the working chambers and at the same time the motor mode operation at the other working chamber.

Abstract: A reciprocating compressor, comprising a cylinder block (1) having a cylinder bore (12) formed therein, a rear head (3) fixed to the cylinder block through a valve plate (2) and having a suction chamber (26) and a discharge chamber (27) formed therein, a front head (4) fixed to the cylinder block (1) and having a crankcase (6) formed therein, pistons (13) reciprocatingly sliding in the cylinder bore according to the rotation of a shaft (7) installed so as to pass through the crankcase (6), a means for separating lubricating oil mixed in working fluid discharged into the discharge chamber (27), and an oil tank (30) for storing the lubricating oil separated by the oil separation means, wherein the lubricating oil stored in the oil tank (30) is cooled by working fluid sucked from the outside and led into the suction chamber (26), whereby the durability of sliding portions can be increased by effectively cooling the lubricating oil in the compressor to assure excellent lubrication at the sliding portions.

Abstract: To reduce the projection of a swash plate servo mechanism in the radial direction, and to make a hydraulic continuously variable transmission compact, a swash plate plunger pump includes a pump casing provided with an input driven gear. A pump cylinder and a motor cylinder are connected to a transmission output shaft, and a motor pivot member provided with a motor swash plate member is supported to be pivotally movable. A motor servo mechanism includes a ball screw shaft, a ball nut to which an end portion of the motor pivot member is connected, and a swash plate control motor to rotate the screw shaft. A swash plate control motor, located on the side of a hydraulic pump relative to the input driven gear, is mounted to the outside surface of a transmission housing close to the center axis side of a transmission output shaft.

Abstract: A rotary piston machine includes a first spheroidal element including pistons and/or cylinders and a second spheroidal element including pistons and/or cylinders, wherein the first element can move relative to the second element. The machine can be used as part of a pump, compressor, or engine.

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 internal combustion, reciprocating piston, motor has a rotating cylinder block. A journal bearing supports a roller that is fastened to a piston connecting rod or fastened to the piston so the roller pushes against an inclined surface on a stationary guide track fastened to a motor housing in order to cause the cylinder block and pistons to rotate. A lubricant is fed from a passageway on the rotational axis of the drive shaft radially outward, through passageways that align, and though a skirt on the piston, in order to lubricate the journal bearing. The rotating piston chambers are sealed against a stationary cylinder head by annular rings at the end of each chamber, and by curved linear seals extending between adjacent annular rings.

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 unit has a drive shaft (52) mounted in a manifold block (54) and coupled to a torque plate (80) on a central axis. A bent axis motive unit (60) has a yoke connected to the manifold block supported for rotation on the yoke. Hollow pistons (100) in cylinders in the cylinder block allow fluid to flow through a torque plate into and form the manifold without the necessity for passing fluid through an articulating member that pivots the cylinder block.

Abstract: The invention relates to an axial piston engine (1) with a housing (2), inside the housing interior (4) of which a drive shaft (7) and a cylinder drum (16), arranged axially adjacent to said shaft, are rotatably mounted. The longitudinal mid-axes (9a, 9b) of the driveshaft (7) and the cylinder drum (17) run inclined to each other at an angle (W). Several piston bores (18) are arranged in he cylinder drum (16), running roughly parallel to the mid-axis thereof and in which pistons (21) may run axially up and down. The ends of said pistons, facing the driveshaft (7), are universally pivoted.

Abstract: A hydrostatic axial piston machine has a drum-like cylinder block which is supported in a manner fixed against rotation on a driving or output shaft and is provided concentrically and parallel to its center line with cylinder boreholes in which axially displaccable pistons are arranged which are supported via spherical heads on a slanting disk which is fixed to the housing and preferably adjustable in its slanting angle. The cylinder openings opposite the slanting disk sweep over roughly kidney-shaped low pressure and high pressure control openings of a control body, between which reversing regions with additional boreholes are located. To control the additional boreholes, which influence the pressure increase or the pressure drop on the passing of the cylinder openings over the reversing regions, in dependence on the operating states, a borehole opens at least in a reversing region of the control body which is connected to the high pressure side or the high pressure control opening by a line.

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: 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: 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: A hydrostatic slewing drive suitable for use in construction equipment, in particular excavators, has a pinion shaft that is rotationally mounted in a housing. A slewing pinion is connected to the pinion shaft. An axial piston motor that utilizes a swashplate construction is in the housing and has a rotating cylinder block with borings and pistons located in the boring. The cylinder block is in one piece with, or integral with, the pinion shaft. The axial piston motor preferably has a constant flow volume, whereby the swashplate is shaped on a housing component. The pistons are supported by slippers on the swashplate which is provided with hydraulic fluid supply channels to which borings in the slippers and in the piston can be connected. The slewing piston can be detachably fastened to the pinion shaft/cylinder block. There is also a brake that can be actively connected with the pinion shaft/cylinder block.

Abstract: A rotary pump has a rotor with a first end, a second end opposite the first end, a central bore and a plurality of cylinder bores arranged about the central bore and extending completely through the rotor from the first end to the second end. There is a plurality of pistons, each piston being reciprocatingly received in one of the bores. A swash plate member has a swash plate adjacent the second end of the rotor and a spigot extending through the central bore of the rotor. There is in an end cap connected to the first end of the rotor. The end cap closes off the bores at the first end of the rotor. A drive shaft is rigidly connected to the end cap and extends away from the rotor. There is a cover having an aperture rotatably receiving the drive shaft. The cover extends about the end cap and the rotor and is connected to the swash plate member.

Abstract: The invention relates to a hydraulic pump having axial pistons, the pump being of the type having intersecting axes, and comprising a rotary rotor with a central axis co-operating with an associated distribution seat via a bearing surface that is substantially perpendicular to said axis, said rotor presenting a plurality of axial bores slidably receiving corresponding pistons. According to the invention, a driver separate from the rotor is provided to rotate about an axis of rotation that essentially coincides with said central axis, said driver serving firstly to center and rotate the rotor about said axis of rotation, and secondly to apply resilient thrust to press the bearing surface of the rotor against the distribution seat.

Abstract: A pump has a main unit (18) for pumping a transferred liquid which is actuated by an secondary unit (20) which pumps a working liquid. The secondary unit (20) has a hub (64) which is rotably mounted in a housing (16). The hub has a cylindrical guiding surface (SG) which is rotatable in the housing. A shoulder (FE) axially positions the hub in the housing. The guiding surface and shoulder cooperate with rotation guiding and axial positioning elements on the housing. The hub connects to a swashplate (62) which actuates a piston (54).

Abstract: A hydrostatic slewing drive suitable for use in construction equipment, in particular excavators, has a pinion shaft that is rotationally mounted in a housing. A slewing pinion is connected to the pinion shaft. An axial piston motor that utilizes a swashplate construction is in the housing and has a rotating cylinder block with borings and pistons located in the boring. The cylinder block is in one piece with, or integral with, the pinion shaft. The axial piston motor preferably has a constant flow volume, whereby the swashplate is shaped on a housing component. The pistons are supported by slippers on the swashplate which is provided with hydraulic fluid supply channels to which borings in the slippers and in the piston can be connected. The slewing piston can be detachably fastened to the pinion shaft/cylinder block. There is also a brake that can be actively connected with the pinion shaft/cylinder block.

Abstract: A piston-operated compressor, of swash plate type and using CO2 as a refrigerant, having a casing member in which a cylinder bore is formed to have a cylindrical peripheral wall surface and a piston reciprocating for compression in the cylinder bore and being formed of an aluminum alloy. The outer peripheral surface of the piston is coated with a film of a fluororesin material, and a piston ring of an iron metal is fitted in the neighborhood of the top portion of the piston to permit the CO2 refrigerant to be compressed under high pressure. A first oil groove is formed in peripheral direction in parallel to and below the vicinity of the groove at the top portion of the piston in which the piston ring is fitted, and a second oil groove is formed below the first oil groove extending along the axial direction in parallel with the central axis of the piston.

Abstract: A hydraulic rotating axial piston engine having a housing enclosing a rotatable cylinder barrel. The engine has a number of axial cylinders with a number of reciprocating pistons. The pistons reciprocate between two defined end positions, and cooperate with a plate angled relative to a rotational axis of the barrel in order to obtain the reciprocating movement. The cylinders have ports alternatively acting as inlet and outlet ports. The housing has an inlet and an outlet channel, each having a kidney shaped port, facing towards the ports of the cylinders and communicating with a number of the cylinder ports. The housing has two parts, one of the housing parts defines the turning positions of the barrel in the end positions of the pistons. A second housing part defines the turning positions of the kidney shaped ports, relative to the end positions. The first and second parts of the housing are alternatively positionable in two different turning positions in the rotational direction of the cylinder barrel.

Abstract: The invention relates to a hydraulic pump having axial pistons, the pump being of the type having intersecting axes, and comprising a rotary rotor with a central axis co-operating with an associated distribution seat via a bearing surface that is substantially perpendicular to said axis, said rotor presenting a plurality of axial bores slidably receiving corresponding pistons. According to the invention, a driver separate from the rotor is provided to rotate about an axis of rotation that essentially coincides with said central axis, said driver serving firstly to center and rotate the rotor about said axis of rotation, and secondly to apply resilient thrust to press the bearing surface of the rotor against the distribution seat.

Abstract: The invention can prevent a heat generation and a seizure due to a sliding friction between a piston and a cylinder in inclined shaft type and swash plate type hydraulic pumps even when they are made high speed.

Abstract: There is provided a reciprocal motion type compressor which has a piston reciprocally movable in a cylinder. The piston has a piston cover and a piston body portion. The piston cover has an insertion portion engaged with the piston body portion. The insertion portion has a sectional shape which becomes smaller gradually from the cover portion toward an end surface of the insertion portion. This structure provides an increased tensile strength of the piston.

Abstract: An air bottoming powertrain, suitable for use in automobiles includes an internal combustion engine, a compressor which receives gaseous working fluid and compresses it to an elevated pressure, a cooler for operating the compressor isothermally, an expander for deriving work from the compressed gas and a heat exchanger located in the compressed gas line for indirect heat exchange between the compressed working fluid and exhaust gas from the internal combustion engine. The expander may have a cylindrical barrel with a plurality of cylinders arranged in the circle and open at one end face of the cylinder barrel, which end face is sealed closed by a valve plate. The cylinder barrel and valve plate allow relative rotation therebetween to drive an output shaft, driven by compressed gas from the compressor. An alternative expander is a Scotch Yoke piston motor which includes plural paired and axially aligned cylinders on opposing sides of an output shaft.

Abstract: The invention relates to an axial piston motor constructed as a swivel-slide structure with a channel to feed cleaning fluid to the driving shaft bearings. The axial piston motor (1) comprises a swivelling cylinder drum (8) and a driving shaft (3) supported on driving shaft bearings (4, 5). The driving shaft (3) is connected to a driving shaft flange (6) to which movable pistons (11, 12) are coupled through the cylinder bores (9, 10) of the cylinder drum (8), and on which the cylinder drum (8) is supported by a central journal (16). In addition, the invention provides for a control specular element (18) with reniform control elements and a regulating device (26), by which the cylinder drum (8) together with the control specular element (18) can be swivelled. According to the improvement added by the invention, the cleaning fluid channel is taken through the setting journal (25) and control specular element (18) up to the central journal (16).

Abstract: An improved hydrostatic transmission having means for hydraulically bypassing the hydrostatic transmission, and the method for bypassing the hydrostatic porting to enable free wheeling of the vehicle. The bypass in one embodiment includes a plate or similar member and a rotatable lever or arm for engaging the plate to lift a hydrostatic pump or motor from its running urface in the hydrostatic transmission.

Abstract: A compressor, in particular for a vehicle air conditioning system, with a housing, which contains a device for conveying a compressed medium driven by a drive shaft, designed as an axial piston machine and having at least one piston reciprocating in a cylinder block and a take-up plate connected to the piston working in combination with a swash plate rotating around a rotational axis, whereby the swash plate is connected to the drive shaft by a carrier and whereby the take-up plate encompasses a support device working in combination with a non-rotating thrust bearing.

Abstract: The invention relates to an axial piston machine (1) comprising a housing (50), a drive shaft (3) mounted in a rotational manner in the housing (50) around a drive shaft axis (12), a cylinder drum (2) which is connected to the drive shaft (3) in a non-rotational manner and in which are embodied cylinders (4) for receiving axially movable pistons (6), and a control plate (26) with control openings (24, 25) designed to cyclically connect the cylinders (5) with a high-pressure and a low-pressure line. The invention provides for a pressing device with at least one centrifugal body (30a-30f), which is impinged upon by a centrifugal force (FF) that increases with the number of rotations per minute (n) of the cylinder drum (2).

Abstract: A cylinder block for a hydrostatic transmission has a rotatable piston housing with a plurality of piston bores arranged in a circular pattern in the housing. A piston element is slidably mounted in each bore. Each of the piston elements has an outer end extendible out of an open end of each of the bores. A well or socket having a rounded bottom portion is in the outer end of each of the pistons. A piston slipper element comprising an arcuate base (a ball) is rotatably mounted in the socket. An arm extends outwardly from the ball and has a laterally extending flat planar surface at the other end. The flat planar surface slidably engages a swashplate having a planar control surface. The distance from the center of the ball to the flat planar surface is greater than the diameter of the piston element.

Abstract: An axial plunger slurry pump comprises a pump body, a sloping cam plate, a swashplate, cylinders, plungers and a pump head. Each of the plungers comprises a plunger body with a rubber piston positioned in its front end and being able to slide over it, and an oil receiving gap communicating with an oil passage disposed between two facing end surfaces of the plunger body and the rubber piston. There are check valves each of which is provided in an oil passage between a ball of each of two-ball links, which ball is coupled with the swashplate, and the swashplate. Each of the cylinder and the plunger body are fitted together by means of a half-and-half locating pad, a cylinder sleeve, a pressing cap, and a locking device. The pump may be used widely in drilling, electric power, mine, building, and metallurgy, etc., for conveying mud, mortar, ore pulp, coal pulp, concrete, etc.

Abstract: A variable displacement compressor includes a swash plate supported tiltably on a drive shaft and slidable in axial directions of the drive shaft. The swash plate has a central support hole into which the drive shaft is inserted. The swash plate has a top dead center point for positioning the piston at a top dead center position and a bottom dead center point for positioning the piston at a bottom dead center position. The center of gravity of the swash plate is displaced from the axis of the drive shaft toward the top dead center point. This location of the center of gravity maintains the radial position of the swash plate relative to the drive shaft by centrifugal force acting on the swash plate when the swash plate rotates. As a result, the compressor is quieter and more stable.

Abstract: A piston-type fluid displacement apparatus includes a housing enclosing a crank chamber, a suction chamber, a suction chamber, and a discharge chamber. The housing includes a cylinder block wherein a plurality of cylinder bores formed, a drive shaft rotatably supported in the cylinder block and a plurality of pistons each of which is slidably disposed within one of the cylinder bores. Each of the pistons includes a cylindrical body and an arm portion axially extending from a first axial end of the cylindrical body and a pair of engaging portions formed the first axial end of the cylindrical body and the arm portion. The cylindrical body of the pistons includes an hollow portion therein. The housing further includes a plate having an angle of tilt and titably connected to the drive shaft and bearing coupling devices coupling the plate to each of the pistons, so that the pistons reciprocates within the cylinder bores upon rotation of the plate.

Abstract: A compressor, which is adapted for use in an air-conditioning system of a motor vehicle, having a housing (2) and a compressor unit (1) arranged in the housing (2) for drawing in and compressing a coolant. The structural size of the compressor is reduced, while sufficient compressor capacity is ensured, as a result of manufacturing the housing (2) from a high-strength material and using a gas that has a high density even in the drawn-in state as the coolant.

Abstract: A hydraulic axial pump/motor comprises a plurality of revolving as well as reciprocating pistons, operatively associated with a stationary port plate. The port plate comprises at least a first, elongated, arcuate suction port and at least a second elongated, arcuate discharge port, divided by a bringing portion extending between the downstream side of the suction port and the upstream side of the discharge port. A tortuous passage of a non-uniform cross-section is formed in the bridging portion, allowing the by-passing of the fluid first in a direction towards the downstream side of the suction port and then towards and into the upstream side of the discharge port.

Abstract: A hydraulic axial piston machine (1) is disclosed, having a cylinder drum (3) with at least one cylinder (4), in which a piston (5) is arranged to move back and forth, which piston bears by way of a slider shoe (7) against a swash plate (8), wherein a pressure plate (9) is provided which holds the slider shoe (7) in contact with the swash plate (8) and is supported against the cylinder drum (3) by way of a ball-and-socket joint (10) comprising a ball-like body (12) and a counterpart (13). In such an arrangement, one would like to avoid weakening the pressure plate by the ball-and-socket joint. To that end, a part of the ball-and-socket joint (10) is provided with a supporting surface (17) which extends substantially parallel to the surface of the pressure plate (9) and by means of which this element (12) lies in face-to-face contact with the pressure plate (9).

Abstract: A hydraulic slipper includes a slipper body having first and second ends and a central portion therebetween. The first end terminates in a spherical-shaped head. The second end terminates in a round base portion with a hub protruding outwardly therefrom in the direction away from the head. The hub terminates in a planar surface and has a diameter less than the diameter of the round base portion. The slipper includes a washer element having a center opening extending around the hub and having first and second opposite planar surfaces. The first surface engages the base portion, and the second surface extends beyond the planar surface of the hub to create a running face for the slipper. The washer element can be a bi-metal ring formed of steel and bronze.

Abstract: A variable capacity swash-plate-type refrigerant compressor incorporating therein single-headed pistons reciprocating in the cylinder bores to compress refrigerant gas, a drive shaft rotatably supported and driven by an external drive source, a swash-plate element mounted around the drive shaft and rotated by the drive shaft so that the rotation of the swash-plate element causing the reciprocation of the single-headed pistons, and a hinge mechanism arranged between the drive shaft and the swash-plate element to permit the swash-plate element to change its angle of inclination with respect to the axis of rotation of the drive shaft to thereby adjustably change the delivery capacity of the compressor, the swash-plate element being constituted by a swash-plate-body member made of an aluminum alloy material and functioning as a sliding contact member cooperating with the single-headed pistons via shoes, and a guide-bracket member made of an iron based material and functioning as a hinge mechanism forming member.

Abstract: A cylinder sleeve is composed of multiple identical interlocking sleeve elements. Each sleeve element has a circular cylindrical portion and an integral circular arc portion tangent to the cylindrical portion. The circular arc portion has a boss on one end and an offset finger on the other which mates with the boss of an adjacent sleeve element to fix the adjacent sleeve elements together radially.

Abstract: An axial piston machine comprises first and second members arranged so that one of the first and second members is swingable relative to the other to provide relative swinging motion, a plurality of pistons inserted in a plurality of cylinders formed in the second member, respectively, the pistons being mechanically engaged with the first member so that the relative swinging motion reciprocates the plurality of pistons in the cylinders, and a swinging mechanism for swinging the above-mentioned one of the first and second members relative to the other, and the axial piston machine is characterized in that the first and second members have spherical portions providing a coupling portion binding one of the first and second members to a spherical point of the other to be universally rotatable about the point, and the above-mentioned swinging mechanism comprises a relative revolving mechanism for revolving at least one of the first and second members relative to the other to provide a relative swinging motion betw

Abstract: A variable capacity wobble plate compressor includes a first spring, fitted on a drive shaft between a hinge ball axially slidably fitted on the drive shaft and a thrust flange rigidly fitted on the drive shaft, for urging the hinge ball toward a cylinder block, and a second spring fitted on the drive shaft between the hinge ball and the cylinder block for urging the hinge ball toward the thrust flange. As the hinge ball is moved toward the thrust flange, a linkage connecting a drive hub slidably mounted on the hinge ball a causes an inclination of the drive hub to be increased to increase capacity of the compressor, and as the hinge ball is moved toward the cylinder block, the linkage causes the inclination of the drive hub to be decreased to decrease the capacity of the compressor. A first stopper blocks the hinge ball from moving toward the thrust flange in excess of a predetermined amount, to thereby restrict an increase in the inclination of the drive hub and set the maximum capacity of the compressor.

Abstract: A swash plate compressor includes a plurality of shoes each arranged on a sliding surface of a swash plate, for relative rotation with respect to a circumference of the swash plate as the drive shaft rotates, a retainer mounted on the swash plate in a relatively rotatable manner with respect to the swash plate, for retaining the shoes, and a retainer support member rigidly fitted on the swash plate, for slidably supporting the retainer. The swash plate compressor has a sliding plate interposed between the retainer and the retainer support member in a slidable manner with respect to both of the retainer and the retainer support member.

Abstract: A compressor has pistons slidably housed in cylinder bores. Respective shoes slide against each of the pistons and a swash plate or cam to convert rotation of the swash plate to reciprocation of the pistons. Each piston has a recess for slidably receiving the shoe. A friction reducing layer containing tin as a major component is formed between the shoe and the piston. Additionally, a tin-based layer may be formed between the shoe and the swash plate.

Abstract: A variable capacity swash plate compressor has a retainer mounted on its swash plate in a relatively rotatable manner with respect to the swash plate for supporting a plurality of shoes, and an annular retainer support plate for supporting the retainer in a state held in surface contact with one face of the retainer. The retainer support plate has an annular recess formed on a cylinder block-side face thereof, for holding lubricating oil therein, and a lubricating oil supply hole formed through a compressing piston-side portion thereof which does not receive tensile forces from pistons in the suction stroke, for supplying the lubricating oil from the annular recess to the one face of the retainer therethrough.

Abstract: A swash plate of a variable capacity swash plate compressor has a front-side sliding surface and a rear-side sliding surface. Pairs of substantially hemispherical shoes each perform relative rotation on the front-side and rear-side sliding surfaces of the swash plate, respectively, with respect to the circumference of the swash plate as the drive shaft rotates. A plurality of pistons each have one end thereof formed therein with a pair of concave support portions for each slidably supporting the shoe. At least one of the front-side and rear-slde sliding surfaces of the swash plate has a mounting recess formed at an outer peripheral portion thereof, the outer peripheral portion receiving no load which acts on the at least one of the front-side rear-side sliding surfaces of the swash plate. The mounting recess is used for assembling the each pair of the pairs of shoes with the swash plate and the pair of concave support portions at the one end of a corresponding one of the pistons.

Abstract: A piston-type fluid displacement apparatus includes several pistons, each of which is slidably disposed within one of several cylinder bores. A plating layer, which includes a self-lubricating material, is coated on a peripheral surface of each piston. At least one annular groove is formed on a periphery surface of each piston, and, at least one piston ring is disposed within the annular groove of each piston for sealing a gap between the piston and the cylinder bore. Thereby, the piston-type fluid displacement apparatus may be simply manufactured at a reduced assembly cost while simultaneously prolonging the life of the piston rings and while reducing or eliminating a decrease in compression efficiency during the operating life of the piston-type fluid displacement apparatus.

Abstract: An axle driving apparatus has in a housing a hydrostatic transmission with a variable displacement type hydraulic system having a slantingly movable swash plate. In one embodiment, the movable swash plate is manually slantingly operable. A leg member integrally extends from an inner wall of the housing, a lid for closing an opening of the housing, or a center section. The leg member has a support portion for supporting a shaft provided on an axis of rotation of the movable swash plate. Accordingly, the movable swash plate is suspended in the housing for slanting or pivoting movement.

Abstract: A hydrostatic slewing drive suitable for use in construction equipment, in particular excavators, has a pinion shaft that is rotationally mounted in a housing. A slewing pinion is connected to the pinion shaft. An axial piston motor that utilizes a swashplate construction is in the housing and has a rotating cylinder block with borings and pistons located in the boring. The cylinder block is in one piece with, or integral with, the pinion shaft. The axial piston motor preferably has a constant flow volume, whereby the swashplate is shaped on a housing component. The pistons are supported by slippers on the swashplate which is provided with hydraulic fluid supply channels to which borings in the slippers and in the piston can be connected. The slewing piston can be detachably fastened to the pinion shaft/cylinder block. There is also a brake that can be actively connected with the pinion shaft/cylinder block.