Abstract: A reciprocating piston machine includes a drive shaft having a central axis, a driving element rigidly connected to the drive shaft and extending essentially perpendicular to the central axis, a guide sleeve enclosing the drive shaft and axially displaceable thereon, and a spring element for applying a force to the guide sleeve and which on the one hand is supported on the guide sleeve and which on the other hand introduces forces into the drive shaft. Forces from the spring element are indirectly introduced into the drive shaft.

Abstract: A hydraulic piston machine includes a plurality of pistons (12, 14) which are driven by a drive/output shaft (40), guided in an axially displaceable manner in a piston barrel (4) of a housing (2), and, in each case, bound one working chamber (44) into which the pressure medium may be fed via a suction valve (46), and from which the pressure medium may be discharged via a pressure valve (48). The housing (2) includes at least one further housing part (6) which is connected to the piston barrel (4) on the front side. The suction valves (46) and pressure valves (48) are situated in the region of a parting plane (50) between the housing parts (4, 6), in housing receptacles (52, 54), approximately axially parallel to the longitudinal axis of the piston machine.

Abstract: A by-pass control system for a meat injection system has a variable speed pump that transports fluid to a meat injection machine. Excess fluid is transported to a by-pass control valve. The valve has a moveable piston disposed therein that separates the valve into a fluid chamber and an air chamber. The piston moves back and forth based on the relationship between fluid pressure and air pressure. Sensors are disposed within or through the lid or the valve to sense the position of the piston. A controller is connected to the sensors and the variable speed pump and adjusts the speed of the pump based on the position of the piston.

Abstract: A swash plate pivot bearing is provided having roller bearing segments (15) arranged between a hollow cylindrical bearing surface (12) for a swash plate (10) in a housing (3) and a cylindrical bearing surface (11) on the swash plate (10), held in curved cages (17) whereby elements are provided for controlling the cages which prevent the cage (17) accommodating the roller body (16) from slipping out from the optimum position thereof in the pivot bearing. The cage control elements are integrated into the roller bearing segments (15) so that at least one roller body (23, 23.1, 23.2) of cylindrical form has a positive engagement with the hollow cylindrical bearing surface (12) and the cylindrical bearing surface (11). It is thus possible to prevent the escape of roller bearing segments (15) from the bearing gap (22) due to the effects of vibration.

Abstract: A diaphragm pump and method for making same, the pump having a diaphragm coupled to a wobble plate achieved using: a post (11) protruding from the wobble plate toward the diaphragm and at least partially surrounded by a collar (11a); and a pin (22) protruding from the diaphragm toward the wobble plate and having a recess (22a) for mating with the post (11) and also having an outer portion (22b) surrounding the recess (22a) and able to resiliently deform so as to squeeze through the collar (11a) when the pin (22) is pushed onto the post (11). The outer portion (22b) of the pin typically includes a locking feature (22c) for holding the pin (22) on the post (11). The pin (22) and the diaphragm are typically made from thermoplastic materials, with the pin (22) typically made from a harder material than the diaphragm.

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: A compressor has a swash plate and shoes. Surfaces of the swash plate slides on flat surfaces of the shoes. A sliding film is formed on each of the swash plate surfaces. The sliding films are formed of a polyamide-imide resin that contains at least solid lubricant. The polyamide-amide resin has a glass transition temperature of 270° C., a tensile strength at room temperature of 200 MPa, or more imide groups than amide groups. When a base portion of the swash plate is made of an aluminum-based metal, the sliding films are formed on the base portion with middle layers made of anodized aluminum in between.

Abstract: A paint composition including a surface-modified fluoro-resin powder and a dispersion medium for dispersing the fluoro-resin powder, with the dispersion medium containing a heat-resistant resin and a solvent for dissolving the heat-resistant resin. The paint composition is useful for painting a sliding part, such as parts of a compressor. In particular, the paint composition is useful for forming a resin layer on sliding surfaces that contains the surface-modified fluoro-resin powder and heat-resistant resin for enhancing sliding properties of these surfaces.

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, formed circumferentially and radially transecting the walls of each cylinder, are each positioned to be almost completely closed at all times by the axial cylindrical body of each respective piston during its entire stroke. Each lubricating channel is interconnected, one to another, to 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 entering 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.

Abstract: A variable displacement swash plate type compressor includes a bearing, a thrust bearing, a lug plate and urging means. The urging means is placed between the bearing and the lug plate and has urging force for reducing thrust force applied to the thrust bearing. The bearing receives radial force and thrust force.

Abstract: A reciprocating piston mechanism for an air-conditioning compressor in a motor vehicle has a housing, a rotary driven shaft, a shaft seal assembly with a gliding ring seal, at least one radial shaft bearing, and at least one axial shaft bearing.

Abstract: A torque transmission apparatus absorbs torque fluctuations (vibrations) while limiting the size of the outside dimensions of a pulley. Elastomeric dampers and pendulum type vibration-absorbing mechanisms are located between an outer tube and an inner tube of a pulley body.

Abstract: A shoe for a swash plate type compressor disposed between a swash plate and a corresponding one of a plurality of pistons, the shoe being characterized by comprising: a base body formed of an aluminum alloy; and a metal plating film which covers at least a portion of a surface of the base body.

Abstract: A swash plate-type compressor has a rotatable swash plate and a piston. The swash plate is made from an alloy of copper containing bismuth. The alloy of copper contains bismuth in a range of about 0.5 wt % to about 20.0 wt %. The piston is connected to the swash plate via at least one shoe and reciprocates in company with each rotation of the swash plate.

Abstract: A sliding member comprising at least one sliding layer including a solid lubricant and at least one thermosetting resin with which particles of the solid lubricant are held together, the solid lubricant containing 10-40 vol. % of polytetrafluoroethylene. A sliding device comprising: at least one first sliding member each including at least one sliding layer which includes a solid lubricant and at least one thermosetting resin with which particles of the solid lubricant are held together, the solid lubricant containing 10-40 vol. % of polytetrafluoroethylene; and at least one second sliding member plated with a nickel-based composition; and wherein the at least one first sliding member and the at least one second sliding member slide relative to each other.

Abstract: An axial piston pump that enables fluid entering the pump to be precharged without the addition of an auxiliary pumping mechanism or other type of external fluid precharge, comprises a housing having a cylindrical inner wall surface surrounding a barrel chamber, a barrel mounted for rotation within the barrel chamber in the housing and having a plurality of circumferentially spaced piston bores therein, and a plurality of pistons reciprocally movable in the piston bores for pumping fluid from a delivery passage to an exhaust passage. The barrel has at least one and preferably plural impeller vanes projecting radially outwardly and terminating at a radially outer vane edge adjacent the inner wall surface of the barrel chamber. Upon rotation of the barrel, the impeller vanes function to supercharge the fluid supplied to the piston bores.

Abstract: A swash plate type compressor including; a rotary drive shaft having an axis of rotation; a swash plate supported by the drive shaft such that the swash plate is inclined or tiltable with respect to a plane perpendicular to the axis of rotation of the shaft; a housing which supports the drive shaft such that the drive shaft is rotatable and axially immovable relative to the housing, which has a plurality of cylinder bores which are located at respective circumferential portions radially spaced from the axis of rotation of the drive shaft and which extend in a direction parallel to the drive shaft; a plurality of pistons each including a head portion slidably engaging a corresponding one of the cylinder bores, and an engaging portion engaging a radially outer portion of opposite surfaces of the swash plate, each piston being reciprocated by the swash plate rotated with the drive shaft; and a plurality of shoes each of which is disposed between one of the opposite surfaces of the swash plate and the engaging po

Abstract: A rotor has a main body including a rotation axis, a weight guide recessed in the main body, said weight guide having a weight guide surface and a weight that is accommodated in the weight guide and contacts with and rolls on a weight guiding surface. The weight swings like a pendulum about a second axis. The second axis is parallel to and offset from the rotation axis. The weight guiding surface guides the weight to keep the weight moving within the guiding surface.

Abstract: A swash plate (15) of a swash plate type compressor includes a slide-contact film (32, 33) having a metal layer, which is formed on a slide-contact surface (152, 153), which slide-contacts shoes (18), through sintering, and a resin layer (322, 332), which is formed on the metal layer. By using the metal layer, which is formed through sintering, the bonding of the resin layer and the metal layer is guaranteed, deficiencies such as cracking of a slide film and seizure are prevented, and the slide-contact characteristic relative to the shoes is improved.

Abstract: A shoe for use in a swash plate type compressor, interposed between a swash plate and a piston, has a base member and metal plating layer. The base member is made of aluminum alloy. The metal plating layer coats at least a part of surface of the base member. The thickness of the metal plating layer ranges from 20 &mgr;m to 150 &mgr;m.

Abstract: A swash plate (3, 18) included in a swash plate type compressor for compressing a refrigerant is made of an aluminum alloy as a base material. Sliding contact surfaces (3a, 18a) of the swash plate (3, 18) in sliding contact with shoes (7, 19) linking the swash plate (3, 18) to pistons (6, 17) are coated with a film of a solid lubricant containing at least one lubricating material selected from molybdenum disulfide, tungsten disulfide and graphite by a transfer method. Therefore, the performance of the film and the productivity thereof are improved.

Abstract: A variable displacement compressor includes a linking groove, which forms a hinge for connecting an arm and an inclining member. The groove is generally U-shaped (open). A link pin is fitted in the groove such that the link pin can pivot or slide within the groove. As a result, installation of a movable parts assembly, which is done by inserting the link pin into the groove, is easier. A controlled pressure chamber improves the response of the compressor to controls.

Abstract: A method of producing a shoe for a swash plate type compressor, said shoe being disposed between a swash plate and a piston of said swash plate type compressor, the method comprising: a forming step of forming a steel blank into a shoe product including an end product shoe and a pre size-adjusted shoe; and a nitriding step of effecting a nitriding treatment on said shoe product; and wherein a quenching treatment is not effected after said forming step.

Abstract: Lubricating films are formed on end surfaces of a swash plate, respectively. The lubricating films make slide contact with shoes, respectively. The lubricating films are made of a copper based material which contains bismuth but does not contain lead. A good slide contact characteristic may be obtained while restricting the amount of lead to be used.

Abstract: An inclined-axis variable displacement unit has an output shaft (1), mounted in a housing (4), and a cylinder block (10), the cylinder block (10) being connected to the output shaft (1) via a synchronizing articulation (13), and via working pistons (11) which can be displaced in the cylinder block (10), and the cylinder block (10) being mounted in a pivoting body (5) which can be pivoted in relation to the axis of the output shaft, it being the case that the pivoting body (5) is in the form of an open vessel, and the cylinder block (10) is arranged in the opening of the pivoting body.

Abstract: A swash plate-type, variable displacement compressor includes a front housing, a cylinder block, a rear housing, and a drive shaft rotatably supported by the front housing and by the cylinder block. The compressor also includes a rotor fixed to the drive shaft, such that the rotor and the drive shaft rotate together, and a plurality of pistons, each of which is slidably positioned within a corresponding cylinder bore. The compressor further includes a swash plate having a penetration hole formed through a center portion of the swash plate. Moreover, the drive shaft extends through the penetration hole and the swash plate is connected to the pistons via a pair of shoes. The compressor also includes a hinge mechanism which connects the rotor to the swash plate. The hinge mechanism includes a single rotor arm having an oblong hole formed therethrough, and a single swash plate arm having a pin portion extending therefrom, such that the pin portion slidably engages an inner wall of the oblong hole.

Abstract: A swash plate-type compressor includes a cylinder block having a plurality of cylinder bores formed therethrough, a drive shaft rotatably supported by the cylinder block, and a swash plate rotatably mounted on the drive shaft. The compressor also includes a plurality of pistons, each of which is positioned within one of the cylinder bores and reciprocates within the cylinder bore. Each of the pistons includes a substantially semispherical cavity formed at an end of the piston. The compressor further includes a pair of shoes positioned between each of the pistons and the swash plate. Each shoe includes a substantially flat surface adapted to be in slidable contact with the swash plate, and a substantially semispherical portion adapted to rotatably engage the semispherical cavity of the piston. Moreover, the semispherical portion of the shoe includes a saddle portion or a groove having a first curved portion and a non-circular perimeter.

Abstract: A semi-spherical shoe 1 has a convex semi-spherical surface 1A which is disposed in sliding contact with a semi-spherical recess 2A formed in a piston 2. The convex semi-spherical surface 1A is defined by a convex surface of a revolving body which is formed when an arc of a circle having a radius of R2 and having a center C offset from the axis L of the semispherical shoe in an direction orthogonal thereto is rotated about the axis L as a center of rotation. A lead-in 1G which is arcuate in section is formed toward the top of the convex semi-spherical surface 1A and maintains a clearance 7 with respect to the semi-spherical recess 2A. A lubricant oil which is stored in a space 4 is smoothly supplied onto a sliding surface 1F through the clearance 7. The invention provides a semi-spherical shoe 1 having a good sliding response and an increased length of useful life.

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 swashplate type hydraulic axial piston machine whose swashplate is arranged on a rocker mounted to pivot in a segmental rolling contact bearing has a tracking device for the cage of the pivot bearing which comprises a rod-like guide element which is connected to said rocker in a first bearing in the rocker so that it can pivot parallel to the pivot plane (SE), is connected to said cage in a second bearing so that it can pivot parallel to the pivot plane (SE) and so that it can be displaced longitudinally, and is mounted to pivot parallel to the pivot plane (SE) in a third bearing. To make tracking by the cage possible without mounting the guide element on the housing, a rocker adjustment member is provided mounted so that it can be displaced transverse to the middle axis of the axial piston machine, and the third bearing is arranged on a guide member movably connected to the adjustment member and the rocker.

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

Abstract: A rotary/linear convertor which comprises a first member may be in the form of a piston (14, 15, 16, 17, 114, 115, 116, 117) and a guide which is preferably in the form of a cylinder (12, 112) the first member being arranged for linear movement within or along the guide and a second member (23, 24, 137) which is adapted for rotational movement. The convertor further includes connecting means operatively connecting the first and second members so that the respective linear or rotational movement of one member causes the respective linear or rotational movement of the other member.

Abstract: A piston and cylinder machine, e.g. an engine or pump, in which the cylinder rotates about a first axis from which the cylinder is spaced, and the piston rotates about a second axis inclined to the first with the result that during the rotation, the piston reciprocates relative to the cylinder. Gas flow is controlled by a rotary valve which communicates with the cylinder and which rotates about an axis parallel to or coincident with the first axis. The piston is maintained in position relative to the cylinder by restraining means in the form, for example, of flat abutment surfaces provided between the piston and a spherically-surfaced piston ring thereon so as to limit lateral movement of the piston ring relative to the piston.

Abstract: A piston and cylinder machine of the kind in which there is a wobble mechanism for reciprocating the piston in the cylinder or an arrangement in which a piston assembly and a cylinder assembly rotate about respective inclined axes so that such rotation is accompanied by relative reciprocation of the piston and cylinder, is provided with a piston having a part which has a surface exposed inside the cylinder to define at least a part of one end of a chamber therein and which, to provide sealing of the chamber, has a peripheral surface forming a sphere. Improved torque transmitting or reacting means for maintaining the correct relative orientation of the piston and cylinder are provided.

Abstract: A device for controlling two output elements pivotally mounted with respect to two stationary elements is provided with two coaxial rectilinear double action pressure fluid jacks. The two stationary elements are respectively secured to the ends of a stationary outer longitudinal elongated member while the two pivoting elements are respectively secured to the ends of pivotal inner longitudinal elongated member coaxially arranged in said outer member. The jacks are of annular configuration and formed between the outer and inner aforesaid members with a common median bottom and annularly slotted cylinder-heads remote from each other. The tubular piston rod of each jack extends in leak-tight manner through the annularly slotted cylinder-head and is angularly positioned on the one hand, with respect to the corresponding stationary element by a first set of guides and on the other hand with respect to the corresponding pivoting element by a second set of guides forming an angle relative to the first set of guides.