Abstract: The invention relates to a radial piston pump for generating high fuel pressure in fuel injection systems of internal combustion engines, in particular in a common rail injection system, having a driveshaft, supported in a housing, that has an eccentrically embodied shaft portion which cooperates with preferably a plurality of pistons capable of reciprocating radially, relative to the driveshaft, in a respective element bore, in order to aspirate fuel and subject it to high pressure in a high-pressure region. In order to increase the efficiency and lengthen the service life, in the outer jacket face (3) of the pistons and/or the inner jacket face of the element bore, a structure in the &mgr;m range is formed.

Abstract: The compressor having pistons and a swash plate, the pistons including head portions reciprocatingly inserted in the cylinder bores and neck portions connected to the head portions. A piston rotation restricting structure includes a first rotation restricting member formed with the neck portion of each piston, and a second rotation restricting member provided in the housing. An inclined guide surface is formed in one end surface of the first rotation restricting member and inclined toward the outer peripheral surface for guiding lubricant from the crank chamber into a gap between the first and second rotation restricting members. The inclined guide surface is formed by a single flat surface or two flat surfaces, or in a recessed shape.

Abstract: A piston for a combustion engine having an oil ring groove on the exterior of the piston which communicates via oil holes with an oil trap extending around the interior of the piston. The oil trap captures lubricant on the downward stroke and pumps lubricant to the piston and cylinder walls on the upward stroke. An oil ring assembly having a wiper, expander and oil ring sections may be provided in the oil ring groove. A bridge may also be provided to support the cylinder head.

Abstract: In a swash plate type compressor having a shoe interposed between a swash plate and a concave surface of a piston, the concave surface has a first and a second spherical surface which are adjacent to and offset from each other to make a slight step extending along the concave surface. The shoe has a spherically convex surface received in the concave surface. In a condition where the spherically convex surface is received in the concave surface, the slight step serves to cause a small gap between the spherically convex surface and a part of the first spherical surface. When the swash plate is rotated together with a rotary shaft, the shoe converts a rotation of the swash plate into a reciprocating motion of the piston.

Abstract: In a piston and connecting rod assembly, for an internal combustion engine with a spherical connecting rod small-end entrained in a hollow piston body by a retention ring, a chamber serving as a localized reservoir for lubricant and/or coolant (oil) is incorporated in the underside of a piston crown along with passages or grooves communicating between the reservoir and a coolant gallery in the piston crown for continuous interchange of lubricant (such as oil) between gallery and reservoir and then lubricant return, over small end (upper and lower) part-spherical bearing surfaces to the retention ring and through lubricant passages in the ring to an engine crankcase, thereby affording an overall circulatory, lubricant feed and drainage path.

Abstract: A piston for a swash plate type compressor, including a head portion slidably fitted in a cylinder bore in a cylinder block of the compressor, a neck portion slidably engaging a swash plate of the compressor, and a connecting portion connecting the head and neck portions, wherein the head portion comprises a circular body portion, and an inner sliding projection extending toward the neck portion from a radially inner circumferential part of the body portion which corresponds to a radially inner portion of the cylinder block. The inner sliding projection has a sliding surface for sliding contact with an inner circumferential surface of the cylinder bore. The sliding surface is symmetrical with respect to a plane including centerlines of the piston and the cylinder block. The connecting portion connects the inner sliding projection and the neck portion.

Abstract: A piston for a swash plate type compressor, including a head portion slidably fitted in a cylinder bore formed in a cylinder block of the compressor, a neck portion slidably engaging a swash plate of the compressor, and a connecting portion connecting the head and neck portions, wherein the head portion has an inner surface which faces towards a centerline of the piston and which has at least one recess formed therein. Each recess is configured so as to accommodate a liquid when the piston is fitted in the cylinder bore.

Abstract: A dispensing apparatus for dispensing a product from a container under pressure of a propellant by means of a composite piston (138). The apparatus has a valve (104) operated by means of an actuator (108) and a lever (166). The actuator co-operates with the valve and lever by means of a screw thread arrangement (110), such that turning actuator relative to the lever varies the flow rate of product out of the apparatus. The valve is a hollow cylindrical tube (104) which is open at one end and closed at the second end, either permanently or by means of a flap valve (112) which allows insertion of the product. A number of ports (116) are arranged around the circumference of the tube (104) adjacent to the second end to allow product to flow through the valve when the lever is operated.

Abstract: A piston pump for delivering hydraulic fluid for ABS brake systems having at least one pump piston. The pump piston is driven to execute an axial stroke motion and which, with a sliding face embodied on its circumference, slides against the inner wall of a guide bore in order to assure a favorable sliding friction between the pump piston and the guide bore for the purpose of noise reduction and to achieve longer service lives for the seal. Viewed in the longitudinal section of the pump piston, the slide face is embodied as wavy, wherein wave crests and wave troughs follow one another in succession in the longitudinal direction of the pump piston.

Abstract: A compressor has a piston (11) that reciprocates between a top dead center and a bottom dead center in a cylinder bore (2a) by means of a driving body (9) mounted on a rotary shaft (6) in a crank chamber (5) during the rotation of the rotary shaft (6). The piston (11) has an outer circumferential surface that slides against an inner circumferential surface of the cylinder bore (2a). The outer circumferential surface of the piston (11) is provided with a groove (17; 44; 46) extending in the direction of an axis (S) of the piston (11). During reciprocation of the piston (11), lubricating oil adhered to the inner circumferential surface of the cylinder bore (2a) is collected in the groove (17; 44; 46). When the groove (17; 44; 46) is exposed to the inside of the crank chamber (5) from the cylinder bore (2a) during the reciprocation of the piston (11), the lubricating oil in the groove (17; 44; 46) is supplied to the inside of the crank chamber (5).

Abstract: An articulated piston apparatus including an improved skirt member wherein the skirt member includes a cooling gallery channel with means for providing a directed flow of lubricant from the cooling gallery channel to the elements of the piston apparatus disposed within the skirt bore, wherein during the upward stroke of the piston apparatus a downwardly directed flow of lubricant flows from the cooling gallery channel through a bore from the cooling gallery channel to the skirt bore and therein impinges those elements of the piston apparatus to assure complete lubrication thereof.

Abstract: A piston for an internal combustion engine, particularly for motor vehicles. An oil-collecting chamber is disposed between the pin bosses above the pin boss bore. Oil collects within the chamber and is directed down onto the pin bosses, during reciprocating motion of the piston. The width of the chamber is approximately the same as the diameter of the pin boss bore.

Abstract: The design and construction of past articulated pistons include an open space between a head portion and an independent skirt portion. The open space allows excess cooling fluid, such as oil, to exit the piston and flow toward the cylinder, increasing oil consumption and carbon deposits within the engine. The present invention overcomes these problems by positioning a sealing means within an open space between a head portion and a skirt portion of an articulated piston. The sealing means completely blocks the oil from exiting the piston while being adequately conformable to allow the necessary articulation between the head and skirt portions.

Abstract: A fluid pump apparatus includes an elongated chamber within which a pair of pistons are movable. The chamber includes an intermediate inlet and outlets at the ends thereof. The pistons are formed of para-magnetic material and include passageways for providing fluid communication between the inlet and the outlets. An external magnetic drive system oscillates the pistons back and forth within the chamber, and includes two pairs of electrically conductive windings, wherein each pair surrounds the chamber at a position between the inlet and one of the outlets. The windings are energized in such a way that they cause the pistons to oscillate in unison with one another. Valves are provided for permitting fluid flow through the passageways in a direction from the inlet toward the outlets, and for permitting fluid flow from the chamber through the outlets. These valves also prevent fluid flow in the reverse direction.

Abstract: A compressible seal member is provided with peripherally distributed and axially spaced lubricant retaining grooves, or with radially extending lubricant channels in communication with a central lubricant reservoir. The sealing member has land portions and groove portions on the outer periphery, with the lubricant grooves or channels located along the groove portions. The seal member is installed within a pharmaceutical container with the tool having a working end received within a central aperture formed in the seal member so that the insertion forced is applied near the bottom end of the seal member to prevent compression during installation. When the pharmaceutical is expelled from the container, a plunger pushes on the accessible end of the seal member to compress the seal member axially and force the lubricant out of the grooves or channels and into contact with the inner wall surfaces of the container.

Abstract: A piston for an internal combustion engine in which a land located immediately above an oil-ring groove and/or a pressure ring groove of the piston is provided with an annular groove-shaped recess at least around an intermediate portion of the land. The annular groove-shaped recess gradually increases in depth from zero upward along the axial direction of the piston to form an oil reservoir.

Abstract: An improved efficiency external combustion engine which utilizes separation on the thermodynamic processes that occur in an external combustion engine into components designed to maximum each operation. The external combustion engine varies flow volume of air to the combustor in response to power demands and delivers fuel to the combustor at a constant air-to-fuel ratio. The system further comprises separate compressors, combustors and expanders wherein the compressor utilizes isothermal compression, the combustor utilizes constant pressure or constant volume combustion or a combination of the two and may provide final compression, and the expander may utilize subatmospheric expansion. Exhaust heat may be regenerated and used in the primary cycle. The engine also comprises a positive lubrication system for the cylinders and pistons that allows a constant flow of a lubricant around the piston. A wide variance valve control mechanism is introduced which offers varied valve timings.

Abstract: An air-powered actuator having a body with first and second ends, an axially transverse annular bulkhead positioned therebetween, and an output shaft with a splined exterior portion. The body includes first and second end walls with each end wall having a sleeve mounted coaxially within the body about the shaft and projecting axially inward within the body. A piston sleeve is disposed for axial reciprocating movement within the body. The piston sleeve has a pair of piston heads, an outer sleeve, and an inner sleeve. The outer sleeve is mounted coaxially within the body inward of the bulkhead and about the first and second sleeves to define therewith a fluid-tight outer chamber containing the piston heads, each positioned to an opposite side of the bulkhead to define four fluid-tight chambers and to which pressurized air is applied. Also defined is a fluid-tight inner chamber containing lubricating oil. The outer sleeve is attached to the piston heads for reciprocating travel therewith.

Abstract: A pair of orifices of different orifice sizes is provided between each pressure chamber and an accumulator chamber. A larger one serves as a variable orifice and a smaller one as a fixed orifice. The variable orifice becomes effective when a control circuit is functioning properly for variably controlling an axial position of a valve spool. The fixed orifice becomes effective when the control circuit malfunctions and allows the valve spool to be moved into a predetermined position. In another embodiment, a single orifice cooperates with the valve spool to serve as both a variable orifice and a fixed orifice.

Abstract: A variable capacity swash plate type refrigerant compressor having a plurality of pistons each including a cylindrical hollow main body reciprocated in a cylinder bore of a cylinder block, and an engaging portion engaged with a swash plate. The cylindrical hollow main body of the piston is provided with at least one first through-bore for providing a communication between the interior of the main body and the cylinder bore, and at least one second through-bore for providing a communication between the interior of the piston main body and a crank chamber of the compressor to thus enable the piston to have a thin and light weight wall construction, and to have a sufficient durability against large pressure changes applied to the piston.

Abstract: In a free piston engine, to reduce dynamic loads on the reciprocating elements caused by a time varying pressure gradient across the gas bearing and close clearance seals provided therein, drain galleries are incorporated at the ends of the gas bearings to isolate the same, and circumferentially spaced grooves are incorporated in the close clearance seal region.

Abstract: A single horizontal cylinder, small refrigeration compressor has a lubrication arrangement which includes a recess on the cylinder block above the cylinder bore which collects oil that drains from the lower end of the motor. A supply passage extends downward from said recess and opens into the cylinder bore near its midpoint. The piston has an elongated shallow groove on the interior between head and skirt lands which is connected to the passage during a major portion of the piston stroke to receive oil from the recess. Drain passage means are provided on the piston to allow oil to flow out of the groove at a lesser rate than it is supplied by the supply passage from the recess.

Abstract: A piston for an internal combustion engine with a separate head and skirt which are joined by a piston pin. The ring belt extends downward from the head and terminates above the pin. The space between the lower edge of the ring belt and a section of the head defines a cooling oil ring space. The head is provided with bores which extend from the cooling oil ring space upward toward the top of the head.

Abstract: In order to ensure an adequate supply of oil onto the thrust surfaces of a reciprocating type internal combustion engine piston, recesses are formed in the skirt proximate each thrust surface. The boundary defined between the surface of the skirt and the recess is defined by a rounded surface which smoothly merges the recess with the surface of the skirt, eliminates sharp edges, and permits oil to flow uninhibited out of the recess onto the thrust surfaces.

Abstract: A two-piece piston composed of independent head and skirt portions, wherein the skirt portion is mounted by means of a wrist pin on bosses located on the lower end of members pending from the head portion, the head portion being provided with an annular recess between the combustion bowl and the ring zone, and the skirt provided with a tray on its upper end, the annular recess and the tray defining a semi-open cooling chamber. With the piston assembled, the lower end of the head portion below the ring zone and the upper end of the skirt portion, which constitutes the outer wall of the tray, define an oil baffle designed to prevent the cooling oil from flowing from the tray toward the space between the piston and the cylinder.

Abstract: A fluid cylinder has improved wear rings in a combination that includes a tube having a tubular wall and first and second end caps. The tubular wall defines a cylinder bore that has a central axis. Each end cap also has a bore extending along the central axis. A piston assembly is mounted in the cylinder bore with a piston rod mounted in the bore of one of the end caps, so that the piston assembly is slidable along the central axis. The piston assembly includes a piston head that has a reservoir defined by an annular recess opening toward the tubular wall. The reservoir houses a prepacked lubricant. One wear ring closes off the annular recess from the tubular wall. The wear ring seal has a plurality of radial apertures extending therethrough, through which lubricant is capable of flowing to lubricate the piston assembly. Another wear ring closes off a reservoir in the bore of an end cap and functions as the first mentioned wear ring also to lubricate the piston assembly.

Abstract: In a two-piece piston with a head piece and a trunk hinged only over the piston pin, the annular space radially located inside the piston ring groove and open in the direction of the trunk is covered with a sheet metal wall part forming a cooling duct. The sheet metal wall part is held by a collar that extends from the outer annular wall of the head piece and is cramped around the sheet metal wall part. For optimally covering the annular space, the sheet metal wall part is radially divided into two parts.

Abstract: A lubricating system is provided at a junction of relatively rotatable members of an engine in an environment where oil comes into contact with the external surface of the rotatable members. The junction includes a relatively rotatable member provided with a bore and pin extending through the bore. The pin is snugly received in the bore so that rotation between the pin and relatively rotatable member may occur. An example of such a system is provided by the wrist pin connection to a piston. According to the invention, within the bore are recesses spaced inwardly and separated from both ends of the bore and arranged diametrically opposed to each other on a line transverse to the principal linear movement of the wrist pin. A pocket for oil is provided by each of the recesses between the bore of the rotatable member and the pin for accumulation of oil to lubricate between the surfaces of the pin and bore.

Abstract: In a piston whose rod 2 is connected in a hinged manner to the upper part of the piston through the piston axis and whose upper part, inside an annular support 5 in the central region of the base of the piston, is to be cooled by the cooling oil injected from the crankshaft chamber, the problem which arises is to introduce the cooling oil into this region without touching the annular support 5. In order to resolve this problem, a deflecting surface for the cooling oil in the shape of a channel section 11 is arranged at the upper end of the rod 2. This channel section 11 guides the injected cooling oil through a radial orifice 10 in the wall of the annular support 5 inside the central cooling chamber 9 below the base 4 of the piston. To improve the cooling effect of the cooling oil in the inner central chamber 9, the latter may be isolated from the crankshaft chamber by a cover 12.

Abstract: A two cycle engine has oil distribution means through the cylinder wall to feed internal oil passages in the associated piston that distribute oil directly to the skirt and cylinder walls, preferably between ports, and/or to the wrist pin and connecting rod bearing to thereby limit oil carryover into the engine charging and scavenging air.

Abstract: The space within the interior cavity (7) of the piston (1) limited by the partially spherical head (5) of the connecting rod (6) is filled with a viscous, pasty or plastically ductile fluid (13), practically incompressible at the operating temperatures and pressures of the piston (1), the diameter (D) of the cylindrical support (8) which limits laterally the cavity (7) being very slightly greater than the diameter (d) of the partially spherical head (5) of the connecting rod (6) so that the clearance during operation between said support (8) and said head (5) is sufficiently minor to prevent any leakage of said fluid (13) from said space at the operating temperatures and pressures of the piston.

Abstract: A hydraulically-operated piston machine includes at least one cylinder and a piston axially movably guided in the cylinder. The piston is connected to a crankshaft or the like by means of a connecting rod. The connecting rod and the piston each have spherically-shaped bearing surfaces serving for connecting the connecting rod and the piston with each other in an articulated manner. The connecting rod defines at its end connected to the piston a radially outwardly facing spherical surface portion which is arranged concentrically with the spherical bearing surface of the connecting rod. The spherical surface portion rests against the surface of a recess defined in the piston, so that a hollow space is defined between the surface of the recess and the spherical surface portion. The piston defines a bore for effecting communication of fluids between the interior of the cylinder and the hollow space.

Abstract: The present invention relates to a cryopump having a gas bearing formed in a clearance seal between a piston and a cylinder. The gas bearing is formed by forcing pressurized gas from a gas plenum through orifices to the clearance seal.

Abstract: Apparatus and method for maintaining viscous liquid sealing substances such a grease adjacent and in contact with seals utilized in pneumatic cylinder-and-piston actuators for oil and gas well swabs, the structure including a piston member which is slideable on the piston rod and which includes an external O-ring for sealing engagement between the cylinders and the piston member and an internal O-ring which is in sealing engagement between the piston member and the piston rod. The piston member is resiliently urged by a compression spring towards the actuating piston and the viscous liquid is trapped between the actuating piston and the slideable piston member. A further like slideable piston member may also disposed on an extension of the piston rod on the opposite side of the actuating piston which is also urged towards the actuating piston. Viscous liquid is trapped between the latter slideable piston member and the actuating piston.

Abstract: A wrist pin lubricating system for a multi-cylinder two-cycle engine comprises a passage system for collecting and distributing crankcase condensate to the piston wrist pin bearings. A slot in each piston skirt provides continuous communication between each wrist pin bearing and a passage in the cylinder wall delivering condensate from the engine crankcases. The condensate is collected at the low point of each crankcase and is pumped to the wrist pin bearings by the pressure differential between two crankcases. Check valves are provided in the passages to maintain a directional flow of the condensate.

Abstract: A piston generates reduced noise in operation by the provision on its lateral bearing surfaces of two or more depressions in which oil is stored to provide a cushion against lateral movement of the piston at points of a reciprocation of the cycle where noise is generated. The depressions have a maximum depth of only 125 microns below the surrounding bearing surfaces formed on the piston. The depressions have circumferentially extending edges which are formed with steps connecting the depressions to the surrounding bearing surface.

Abstract: A Stirling cycle engine is provided with gas cavities at an interface between an engine piston and a mating surface that guides the piston in its reciprocative motion to thereby achieve improved lubrication with the resulting gas film.

Abstract: A continuous ring with inside diameter (D.sub.in.sup.R) larger than the outside diameter (D.sub.out.sup.R) of the piston irrespective of conditions of operation. The ring's outside diameter when measured outside the cylinder equals or slightly exceeds the inside diameter of the cylinder. The ring is sized and designed according to various parameters determined so as to prevent piston seizing in the cylinder.

Abstract: Piston for internal combustion engines, with an oil scraper ring disposed in an annular groove at the circumference of its head portion. The outer edge of the annular groove adjacent to the piston skirt which adjoins the head portion is bevelled to form a chamfer. In order to ensure the maintenance of an oil film sufficient to prevent dry running of the piston, on the cylinder wall, the width of the chamfer is greater on the thrust side of the piston. The width of the chamfer may decrease essentially continuously from the counter-thrust side to the pressure side.

Abstract: A piston boss is formed with an oil inlet hole for collecting oil flowing downward along a piston and allowing it to flow toward a snap ring and an end of a ceramic piston pin in contact with the snap ring. The oil having lubricated the snap ring and the end of the piston pin is collected by an oil outlet hole formed in the piston boss and allowed to flow downward therethrough.

Abstract: A piston has skirt portions (13) which are provided with parallel rows (14) of cavities (15) whose maximum depth below the surface of the skirt portion is 0.010 mm. Parts (20,23) of the skirt portion are left between the cavities for providing a reduced area, in comparison with the full skirt portion, for the transmission to an associated cylinder or liner of lateral loads; this reduced area reducing the frictional losses. The cavities (15) hold lubricating oil and provide a cushion of oil which supplies oil to the reduced bearing areas and which tends to resist lateral movement of the piston at top and bottom dead center, so reducing or eliminating "piston slap".

Abstract: An apparatus for compressing a gas includes a preferably substantially vertically oriented cylinder body, having a longitudinally extending bore with a wall, and a preferably substantially vertically oriented piston adapted for reciprocating movement in the cylinder bore. The piston includes a piston head preferably having a substantially horizontally oriented top face and a seal groove extending around the periphery of the piston head and spaced from the piston head top face. At least one fluid passage extends in the piston head from the top face thereof to the seal groove. A seal member is positioned in the groove and has an outer face adapted to contact the cylinder inner wall. A layer of a lubricant is provided on the piston head top face. An inlet aperture is provided for allowing a gas to enter the cylinder above the piston head. A movement member is provided to urge the piston upwardly and compress the gas.

Abstract: A fixture cylinder is provided that permits the use of integrally mounted proximity switches with the same fixed probe lengths on both end caps without requiring the use of spacers. The cylinder includes a body in which a piston assembly is slideably mounted about a longitudinal piston axis in a bore in the body. The piston assembly has a piston head, piston rod and a pair of hubs of equal diameter on opposite sides of the piston head. First and second end caps are provided on opposite ends of the body. Each end cap has a plurality of outer edges and a generally flat mounting surface is provided on one edge thereof for receiving a proximity switch. An aperture perpendicularly extends through each end cap and communicates with the bore in the body of the piston assembly. Two substantially identical proximity switches having generally flat mounting surfaces and the same fixed probe lengths are employed.

Abstract: A decompression seal mechanism has a body containing a series of cavities formed by alternate grooves and lands and formed of a porous structure deposited by a plasma spray, and means for supplying said porous structure with a positive flow of liquid lubricant.

Abstract: A refrigerant compressor includes a piston with two circumferential grooves on the outer surface of the piston, one of the grooves being located near the top and the other near the bottom. Conical piston rings made of plastic are disposed in the grooves. The piston rings, which have an outer diameter greater than that of the piston, have a curved surface shaped so that the outer diameter of the curved surface at one axial end of the piston ring is smaller than that at the other axial end. This unique arrangement of the curved conical seals reduces the loss of horsepower in motor driven refrigerant compressors by providing improved sealing between the piston and cylinder.

Abstract: A pneumatic pressure actuator including a cylinder assemblage having a pair of metallic cylinder heads and a fiberglass cylinder casing held together by a plurality of tie bolts and nuts. A piston and piston rod reciprocally movable within the cylinder assemblage and including a greased nylon cushion ring and polyurethane wiper ring for reducing frictional wear between the relatively movable surfaces.

Abstract: A piston for internal combustion engines, which has inclined surface portions in the skirt area to allow formation of hydrodynamic wedges of lubricant, these surface portions being constructed as skirt recesses (13 or 14) which are open either towards the upper or towards the lower end of the piston skirt. The transition zone from these skirt recesses to the bearing surface of the working surface of the piston is constituted by oblique surfaces which are inclined inwardly from the surface of the skirt. The oblique surfaces terminate in a circumferential direction within the bearing surfaces of the piston. The oblique surfaces constitute ramps on which a hydrodynamic wedge of lubricacting oil can form.

Abstract: A piston assembly for a reciprocating piston type compressor includes a piston slidably disposed within aluminum alloy cylinders. The pistons have two annular grooves provided toward opposite ends on their outer peripheral surfaces. A conical shaped piston ring formed of resin and having an outer diameter larger than the outer diameter of the piston is disposed in each groove. The conical shaped piston ring creates a gap between the piston and cylinder to prevent direct contact between the piston and cylinder to thereby avoid abnormal wearing while effectively maintaining the flow of lubricating oil from the cylindrical chamber to the crank chamber.

Abstract: A hydropneumatic suspension unit includes a large diameter flanged road arm spindle which is bolted to the vehicle hull; a road arm has one end rotatably mounted on the road arm spindle and another end mounting a road wheel; a barrier fluid sealed piston is reciprocated relative to a road arm bore to seal an in-arm mechanically operated pneumatic spring which has a gas volume trapped by the barrier fluid sealed piston to support the sprung mass of the vehicle; the sealed piston is defined by a pair of spaced seals and an oil chamber which has an oil charge therein pressurized by preload spring on the piston to displace the oil barrier to both lubricate and preload the pair of spaced seals as the piston is dynamically operated to vary gas compression and produce a resultant pressure on the piston to counteract vertical forces on the road wheel.

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.