Abstract: A shaft and a rotary valve, which are formed integrally, are made of an iron-based metal while a cylinder block is made of an aluminum-based metal. A sleeve forms a slide surface between the cylinder block and the rotary valve when the shaft and the rotary valve rotate together. The sleeve has a coefficient of thermal expansion closer to those of the shaft and the rotary valve than that of the cylinder block. This structure prevents an increase in the clearance between the housing and the rotary valve due to the increased temperature at the time the shaft rotates at a high speed, and prevents gas leakage and a reduction in sealability.

Abstract: Improvements for variable capacity compressors are provided utilizing a multitude of springs in varying arrangements between the plate and rotor within the compressors. The advantages may include increased spring constant, increased variability control, and increased packaging efficiency. Methods of constructing variable capacity compressors utilizing a multitude of springs in varying arrangements between the plate and rotor are also provided.

Abstract: An axial piston pump with center inlet fill utilizes a hydrostatic thrust bearing and a hydrodynamic journal bearing to support a rotating wobble type drive plate connected to a drive shaft. The rotation of the drive plate causes a plurality of parallel pistons to reciprocate up and down. The pumping chambers of a portion of the pistons are fluidly connected via a center fill passage to the inlet defined by the pump housing. Simultaneously, the pumping chambers of a different portion of the pistons are fluidly connected to the outlet via a high pressure actuation fluid outlet passage. The center fill passage exploits centrifugal forces to assist, rather than resist, the supply of low pressure fluid to the pistons, especially when rotating at higher speeds.

Abstract: A piston for a compressor has a head portion, a neck portion, a receiving wall for receiving reactive force and a first guide wall. The receiving wall extends from a drive shaft side of the head portion towards the neck portion; is disposed on a preceding side in a rotating direction of a cam plate; and has an outer circumferential surface that slides over the inner circumferential surface of the cylinder bore. The first guide wall extends from the drive shaft side of the head portion towards the neck portion; is disposed on a following side in the rotating direction of the cam plate; and has an outer circumferential surface that slides relative to the inner circumferential surface of the cylinder bore. A recess is formed in the outer circumferential surface of the first guide wall.

Abstract: A hydrostatic variable displacement pump has a swash plate (3), which is used to adjust the stroke of displacement pistons in a cylinder block. The swash plate has its angle position pivoted in relation to the stroke direction of the displacement pistons by means of a servosystem. The servosystem is fitted on the housing (6) of the variable displacement pump. The servosystem (4) has a pressure cylinder (18) and a servopiston (7), which together form a servocylinder pressure chamber (8). The servopiston (7) operates in the pressure cylinder (18), is subjected to compressive loading by means of a spring assembly (9,10) and has a piston with at least two servopiston surfaces (11, 12) subjected to the action of pressure.

Abstract: Disclosed herewith is a structure for supporting a swash plate at the maximum tilt angle in a swash plate type compressor. A support projection is formed at a predetermined position of the front surface of the swash plate to define the maximum tilt angle by coming into contact with the rotor of the compressor. When a connecting line passing through the center of a bore, into which a piston in the maximum compression stroke state is inserted, designated by LC, the support projection is situated on an acting line LP, which is spaced apart from the connecting line LC by a predetermined horizontal distance LF in the rotational direction of the swash plate, so as to define the maximum tilt angle of the swash plate.

Abstract: A piston is used in a fluid machine. The fluid machine has a drive shaft and a cam plate operatively connected to the drive shaft. The drive shaft integrally rotates with the cam plate in a housing. The piston has a head portion, a neck portion, a receiving wall and a guide wall. The head portion is accommodated in a cylinder bore in the housing. The neck portion is operatively connected to the cam plate. The receiving wall integrally connects the head portion and the neck portion on the drive shaft side. The receiving wall is formed substantially on a preceding side in a rotating direction of the cam plate. The guide wall integrally connects the head portion and the neck portion on an opposite side of the drive shaft side. The guide wall is formed substantially on a following side in the rotating direction of the cam plate.

Abstract: A hydrostatic transaxle assembly is drivingly connected to a power source and the power source is activated through an electric starter circuit. The hydrostatic transaxle includes an axial type hydrostatic transmission module having a pump which includes a plurality of axially arranged cylinders each including a piston therein. A tiltable swash plate includes a lateral surface rotatable within the hydrostatic transmission casing. The swash plate is in engagement with the plurality of pistons wherein tilting of the swash plate effectuates fluid displacement of the pump. A neutral switch is fixed relative to the transmission casing and includes a registering portion engaged with the swash plate to detect a neutral position and correspondingly allow starting of an electric starter through the starter circuit. A neutral adjustment assembly includes a control rod rotatably supported by the casing and a two piece shift lever is attached thereto.

Abstract: A rocker cam type, variable displacement, axial piston pump where working pressure fluid supplied to said housing is fed to a pair of counterbalance pockets formed in the rocker cam through fluid passages located within the rocker cam.

Abstract: In a variable-capacity swash-plate type compressor, which can vary the outlet capacity by controlling an inclination angle of a swash plate, the swash plate is aligned by contacting a washer (19) with a tapered surface to the swash plate (18). Thus, in a case where a compression operation is not carried out or in a case where a compression operation is carried out at a small outlet capacity regarded as zero substantially, the noises, etc., which generate between the swash plate and a driving shaft (6), are inhibited.

Abstract: An inclined-axis variable displacement unit comprises 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 (18), and via working pistons (11) which can be displaced in the cylinder block (10), the cylinder block (10) being mounted in a pivoting body (5) which can be pivoted in relation to the axis of the output shaft (1) by an adjusting means, it being the case that the adjusting means is arranged on that side of the pivoting body (5) on which the output shaft is located.

Abstract: A hydrostatic variable displacement pump of swash plate construction has a cylinder block 2, in a housing 1, with displacement pistons 3 guided therein, a swash plate 4 and at least a first bearing 5 and a second bearing 6, which supports the angle adjustable swash plate 4. The housing 1 has a first opening, through which the swash plate can be introduced. The first bearing 5 has a removable outer race 13 which is designed such that, following installation of the second bearing 6 of the swash plate 4 in the bearing seat 8, it fixes said swash plate in the bearing seat 7 of the first bearing 5. The servomechanism 9, 10 is integrated in a cover 10 which closes off the housing 1 on the side of the first bearing 5.

Abstract: A swash plate is operably connected through a lug plate and a hinge mechanism to a drive shaft, and slidably retained on an end part of each piston through a pair of front and rear shoes. A rotational motion of the swash plate following rotation of the drive shaft is converted through the shoes into a reciprocating motion of each piston. A thermoplastic polyimide coating is formed on the swash plate and the shoes as sliding components of a compressor. The thermoplastic polyimide coating may contain a solid lubricant. For the solid lubricant, for example, polytetrafluoroethylene is used. Thus, it is possible to obtain a compressor, which includes the sliding components having improved sliding characteristics, and is manufactured relatively easily.

Abstract: A pump has wobble pistons rigidly connected to arms of a nutating plate that is mounted on a bearing eccentrically mounted to a drive shaft by a counterweight. The piston assembly is nearly perfectly balanced by the counterweight due to its precisely defined moment of inertia and mass components. In particular, the counterweight produces a counter moment equal to the average moment produced by the piston assembly, preferably with a mass moment of inertia component corresponding to the average mass moment of inertia of the piston assembly. It also has a mass component providing a counter balance force opposing a radial force arising from the piston assembly having a center of gravity spaced from the shaft axis, and it has a mass component providing a counter balance moment opposing the moment arising from the counter balance force and the center of gravity of the piston assembly being spaced apart axially.

Abstract: A variable displacement axial piston pump is typically used to receive fluid from a tank and supply pressurized fluid through a control valve to move an actuator. The present variable displacement axial piston pump has a swashplate arrangement that is capable of being angled in two different directions to control the pressure transitions between the low pressure inlet port passage and the higher pressure outlet port passage as cylinder bores in a barrel of a rotating group rotate through trapped volume regions situated between inlet and outlet port passages of the axial piston pump. Movement of the swashplate arrangement in two different directions provides smooth pressure transitions and increases the operating efficiency of the variable displacement axial piston pump.

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: An axial piston pump with center inlet fill utilizes a hydrostatic thrust bearing and a hydrodynamic journal bearing to support a rotating wobble type drive plate connected to a drive shaft. The rotation of the drive plate causes a plurality of parallel pistons to reciprocate up and down. The pumping chambers of a portion of the pistons are fluidly connected via a center fill passage to the inlet defined by the pump housing. Simultaneously, the pumping chambers of a different portion of the pistons are fluidly connected to the outlet via a high pressure actuation fluid outlet passage. The center fill passage exploits centrifugal forces to assist, rather than resist, the supply of low pressure fluid to the pistons, especially when rotating at higher speeds.

Abstract: A variable delivery fixed displacement pump is provided which has a rotating drive plate with a fixed angle. The drive plate has a fill passage extending between its radial outer surface and its drive surface, which allows fluid to be supplied to a fluid journal bearing. The drive plate also has a series of bearing supply passages which fluidly connect the drive surface of the drive plate with a base surface, allowing fluid to be supplied to a fluid thrust bearing. A method of pumping fluid is also provided which is comprised of the steps of reciprocating a plurality of pistons at least in part by rotating the drive plate, and by fluidly connecting a pumping chamber of the pistons to an annular groove that is part of the drive plate fill passage.

Abstract: A control system, method and apparatus are provided in which a wobble plate assembly is adjustably mounted on a piston and cylinder stroke control assembly. The wobble plate assembly is adjustable through various positions relative to the base, thus providing an adjustable tilt angle to the wobble plate assembly and different strokes for the pumping pistons. In another embodiment the wobble plate assembly is affixed to a clearance volume control assembly, thus providing for simultaneous, independent adjustment of piston stroke and clearance volume of the axial device.

Abstract: A fixed displacement compressor includes a cylinder block having a plurality of cylinder bores formed therethrough, a drive shaft rotatably supported by the cylinder block, and a plate rotatably mounted on the drive shaft. Moreover, an inclination angle of the plate varies relative to a radial line perpendicular to the drive shaft. The compressor also includes a spring positioned adjacent to the plate. The spring is adapted to urge the plate in a direction which reduces the inclination angle of the plate. In an embodiment, the plate is a swash plate. In another embodiment, the compressor further includes a cam rotor fixed to the drive shaft. In this latter embodiment, the spring is positioned between the cam rotor the plate.

Abstract: A power transmission mechanism has a first rotary body, a second rotary body and an elastic body. The second rotary body is located coaxially with the first rotary body. The first rotary body is operatively connected to the second rotary body through the elastic body for transmitting torque. The elastic body has a plurality of elastic members so as to stepwise change an elastic coefficient of the elastic body in accordance with the value of the torque.

Abstract: A speed adjusting mechanism for use in connection with, a hydrostatic transaxle comprising a casing in which is mounted a rotating hydraulic pump in fluid communication with a rotating hydraulic motor, a moveable swash plate cooperable with the rotating pump for controlling the speed and direction of rotation of the hydraulic motor, and a trunnion arm linked to the moveable swash plate for adjusting the orientation of the swash plate. The speed adjusting mechanism includes a return arm adapted to be mounted to the casing in a fixed position indicative of a neutral position of the trunnion arm. A control arm is mounted to the trunnion arm and a pair of scissor return arms are provided which cooperate with the return arm to move the control arm to the neutral position.

Abstract: The radial piston pump possesses a pump body with a plurality of cylinder borings for the reception of pump pistons which can be driven by a cam. The cylinder borings are closed by valve plugs in which pressure passages are provided. In the pressure passages, outlet valves are inserted which respectively possess a valve stem (7) an end of which, proximate to the pump piston (1), is provided with an impact plate.

Abstract: A compressor includes a housing having a hollow projection portion, a rotary shaft provided rotatably within the housing, a piston reciprocating in accordance with rotation of the rotary shaft for sucking and discharging refrigerant, a bearing disposed within the projection portion of the housing for rotatably supporting one end of the rotary shaft and an attaching leg portion formed on an outer surface of the projection portion of the housing. The attaching leg portion is fastened to an engine block, a bracket or the like by using a bolt or the like.

Abstract: A hydrostatic axial piston machine employs a swash plate construction in which the diagonal position of the swash plate can be controlled by at least one positioning piston pressurized with a control pressure. A control valve is in a line which leads to at least one positioning piston. A simple electrical-hydraulic control of the swash plate can be accomplished by the electrical actuation of the control valve. The control valve may be in the form of a rotary disk valve which can be actuated by a stepper motor.

Abstract: In an axial piston motor having a drive shaft, an inclined plate, and an adjusting device for the inclined plate, and at least one adjusting control cylinder with control piston adapted to establish pressure contact and to cooperate with the inclined plate and having a closed face and being formed as an inwardly open cylinder having an open end, a coil spring disposed within the inwardly open cylinder and pressing against the closed face, a sliding bush having two ends, one end thereof ranging into the inwardly open cylinder and having a flange at its opposite end and having different operating positions, one end of the coil spring resting against the flange, with the coil spring biasing the flange away, the improvement which comprises a rod connected to the closed face of the control piston, the sliding bush being formed as a hollow cylindrical sliding object having an inside diameter guided upon the rod.

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 structure for supporting a swash plate of a variable displacement swash plate type compressor is disclosed. The structure has a spherical sleeve slidably mounted on the drive shaft, a journal mounted on an outer surface of the sleeve and inserted in the swash plate, and a pair of pins adapted to connect the journal to the sleeve. An external diameter of the sleeve is smaller than an internal diameter of the journal, so that a predetermined gap is provided therebetween. Since the sleeve and the journal are not in contact with each other but connected to each other by the pins, a precise machining operation of the facing surfaces thereof and an additional machining operation for flat surfaces are not necessary, thereby facilitating machining of the sleeve and the journal. Lubrication therebetween is also not necessary.

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

Abstract: A variable displacement swash plate type compressor which incorporates a swash plate slidably mounted on a drive shaft, the swash plate having side walls that taper toward one another for constant point contact with a ball bearing of an associated piston which results in a smaller required diameter for the swash plate and smoother operation of the compressor over prior art structures.

Abstract: The present invention relates to a variable capacity swash plate type compressor.

Abstract: A swash plate compressor includes a cylinder block having positioned therein a plurality of cylinders and a crank chamber. Each of a plurality of pistons has a head portion and a skirt portion. The head portion of the piston is slidably disposed within one of the cylinders. The skirt portion of the piston slidably abuts on an inside surface of the crank chamber, and by its action the pistons are prevented from nutating axes when the pistons are driven in a reciprocating motion within the cylinders upon rotation of the swash plate. The crank chamber has a truncated cone-shape, the inside diameter of which is reduced between a top dead center and a bottom dead center of the piston. The structure for the swash plate compressor according to this invention reduces vibration and noise caused by the nutation of the pistons.

Abstract: A variable displacement swash plate type compressor which incorporates a swash plate slidably mounted on a drive shaft, the swash plate having side walls that taper toward one another for constant point contact with a ball bearing of an associated piston which results in a smaller required diameter for the swash plate and smoother operation of the compressor over prior art structures.

Abstract: Cylinder block (32) of an axial piston compressor (20), in particular for use in a vehicle air conditioner with C02 as coolant, which comprises at least one, in particular several cylinder bores distributed about a periphery, each of which defines a cylinder face and accommodates a piston (8) consisting of piston shaft (8a) and piston neck (8b), wherein the piston neck (8b) outside the cylinder bore serves for coupling to a swash- and/or wobble-plate drive mechanism (29, 33) operatively connected to a rotatable drive shaft (1), by means of which the piston (8) is movable back and forth within the cylinder bore, between a top-dead-center point (OT) and a bottom-dead-center point (UT), and wherein the edge of the opening of the cylinder face on the drive-mechanism side comprises at least one recess (26d) that can be at least partially engaged by a transitional region (8c) disposed between the shaft (8a) and the neck (8b) of the piston, so that the cylinder face effective for the piston (8) is enlarged or elonga

Abstract: A swash plate-type, variable displacement compressor according to the present invention has a structure wherein the shoe holding portion of the piston sandwiches the swash plate from inside. The swash plate is connected to the rotor by a pin which extends in a direction tangential to a surface of a virtual cylinder around an axis of the drive shaft so as to be capable of swinging with respect to the pin. Especially, the position of the pin in the axial direction of the drive shaft is selected, so that a piston top clearance of a piston which is in a top dead center position becomes zero. By this configuration, the piston top clearance of all the pistons may be maintained at zero for all oblique angles of the swash plate. As a result, for any oblique angle, the volumetric efficiency of the compressor may be improved.

Abstract: A hydraulically actuated servo piston and hydraulic advance piston are integrated into the cam follower of a unit pump or injector to provide variable advance for an injection event produced by the pump or injector. The servo piston is nested in the advance piston with fluid passageways in the advance piston selectively opened or closed by movement of the servo piston. The full pressure of a hydraulic pump is available to the advance piston for powering the advance function, while stepwise reduced levels of hydraulic pressure from the same hydraulic pump are applied to control movement of the servo piston. A damping orifice restricts flow of hydraulic fluid to and from the servo piston.

Abstract: An axial piston device (11) of the bent axis type including a housing (13), a main shaft (29) defining an axis of rotation (A), a cylinder barrel (37) defining a plurality of mutually parallel cylinders (39), and a piston (45) reciprocably disposed in each cylinder (39). The cylinder barrel is mounted to be pivotable within the housing relative to the axis of rotation (A). A universal type connection (35) is operable to transmit rotational movement between the main shaft (29) and the cylinder barrel as the cylinder barrel pivots through its range of motion between a minimum displacement and a maximum displacement (FIG. 2) relative to the axis of rotation (A). A plurality of connecting rods (49) is arranged to correspond generally to the cylinders, each connecting rod including a ball portion (51) pivotably received within a socket member (55) fixed relative to the main shaft (29).

Abstract: A swing member is supported by a swing support member like a universal joint of a Hook's type such that it can swing in a state where it is prevented from rotating around a center line. In this manner, even if a shaft rotates at high speed, the swing member is surely prevented from rotating around the shaft. Therefore, it is possible to prevent a piston from excessively vibrating, hence to prevent large noises from being made, and to improve reliability and durability of a compressor when the compressor is operated at high speed.

Abstract: A control valve used for a variable displacement compressor comprises a valve housing, a valve chamber defined in the valve housing, a valve body. The valve body is located in the valve chamber. A pressure sensing chamber is defined in the valve housing. A movable wall is located in the sensing chamber to divide a first pressure chamber and a second pressure chamber. The movable wall moves in accordance with the pressure difference between the first pressure chamber and the second pressure chamber. A rod transmits the movement of the movable wall to the valve body. The pressure directed in the vicinity of the end portion of the rod is the same type pressure directed in the first pressure chamber or in the second pressure chamber. An actuator determines the target pressure difference between the two pressure chambers. This permits the displacement of the compressor to be quickly changed.

Abstract: A swash plate type compressor having variable capacity includes a housing unit having a cylinder block where a plurality of bores are formed and forming a crank chamber, a suction chamber, and a discharge chamber, a drive shaft rotatably installed by the housing unit, a piston installed at each of the bores of the cylinder to be capable of sliding, a rotor disposed at the crank chamber and installed at the drive shaft, and rotating together with the drive shaft, a swash plate coupled to the rotor by a hinge unit for reciprocating the piston and having a hub coupled to the drive shaft, and a pivot unit for limiting pivot of the swash plate as a slot formed in the drive shaft in the axial direction and the hub of the swash plate are directly pin-coupled.

Abstract: A variable swash plate compressor (10), including a housing (12), a top inlet (14A), a bottom inlet (14B), a pumping chamber (16), a compression piston (18), a top outlet (20A), a bottom outlet (20B), a drive shaft (22), a control surface element (24), a pinnacle element (26), a swash plate (28), a bore (30) and a pocket (32) formed in the swash plate (28), a pivot element tip (38) and fulcrum piston assembly (40). Wherein the angle of the swash plate (28) relative to the drive shaft (22) is varied to bring about a larger or smaller travel path of the double-sided compression piston (18) and thereby increasing or decreasing the output capacity of the variable swash plate compressor (10).

Abstract: An adjustable stop assembly (33) for limiting maximum yoke angle of a hydraulic pump(11) having a fluid displacement proportional to the angle of the yoke (25). The adjustable stop assembly (33) includes a control piston (37) for inclining the yoke (25) to define a desired yoke angle, and a stop member (57) defines a set of internal threads (67) and is disposed within a cavity (65) defined by the adjustment assembly. An adjustment screw (51) is disposed for rotational motion, comprising a portion (49) operable to retain the adjustment screw (51) reciprocally stationary relative to the adjustment assembly (33), the adjustment screw (51) further comprising a first set of external threads (53) for engagement with the internal threads (67) of the stop member (57), whereby rotation of the adjustment screw (51) causes axial travel of the stop member (57), thereby displacing the control piston (37).

Abstract: In a housing of an axle driving apparatus whose interior space serves as a fluid sump is disposed a center section in which a pair of fluid passages are formed so as to serve as a closed fluid circuit connecting a hydraulic pump and a hydraulic motor therethrough. In the housing are also disposed a movable swash plate for adjusting an amount of fluid discharged from the hydraulic pump, and a pivotal control arm for operating the swash plate. The control arm includes a fluid groove in constant communication with the fluid sump. Either of a pair of orifices is brought into communication with the fluid groove of the control arm when the control arm is located in a certain range. Each of a pair of check valves is interposed between each of the orifices and each of the fluid passages. The check valve allows fluid to flow from the fluid passage to the orifice, and stops flow of fluid from the orifice to the fluid passage.

Abstract: A piston-type compressor includes a cylinder block having cylinder bores and a rear housing having a separating wall to divide the interior of the rear housing into a suction chamber and a discharge chamber. Pistons are arranged in the cylinder bores to reciprocate therein. Bolts are inserted in the cylinder block and extend into the separating wall of the rear housing to connect the cylinder block and the housing together. Since the separating wall is forced to the cylinder block by the bolts, no leakage occurs between the suction chamber and the discharge chamber.

Abstract: A hydrostatic variable displacement pump has a swash plate (3), which is used to adjust the stroke of displacement pistons in a cylinder block. The swash plate has its angle position pivoted in relation to the stroke direction of the displacement pistons by means of a servosystem. The servosystem is fitted on the housing (6) of the variable displacement pump. The servosystem (4) has a pressure cylinder (18) and a servopiston (7), which together form a servocylinder pressure chamber (8). The servopiston (7) operates in the pressure cylinder (18), is subjected to compressive loading by means of a spring assembly (9,10) and has a piston with at least two servopiston surfaces (11, 12) subjected to the action of pressure.

Abstract: A swash plate compressor provided with a housing internally defining and forming cylinder bores, a crank chamber, a suction chamber, and a discharge chamber; pistons accommodated in the cylinder bores to be able to reciprocate in them; a drive shaft driven by an external drive source and supported by the housing; a swash plate synchronously rotatably supported with respect to the drive shaft; and shoes at the front and rear of the swash plate for driving the pistons; wherein the shoes are mainly comprised of a magnesium-based material.

Abstract: A symmetric pump having a symmetric end cap attached to a symmetric housing is disclosed. The end cap is attachable in a first position or a second position wherein the second position is rotated relative to the housing. A trunnion arm extends in a first direction and a system port opens in a first orientation when the housing is connected to the end cap in a first position. The end cap includes structure such that the housing may be connected in a second position so that the trunnion arm extends in a second direction while maintaining the system port opening in the first orientation. The end cap may be provided with a symmetric porting system. A control device for affecting movement of the swashplate is disclosed. Methods of locking the swashplate into a predetermined position are also taught.

Abstract: Disclosed herewith is a structure for supporting a swash plate at the maximum tilt angle in a swash plate type compressor. A support projection is formed at a predetermined position of the front surface of the swash plate to define the maximum tilt angle by coming into contact with the rotor of the compressor. When a connecting line passing through the center of a bore, into which a piston in the maximum compression stroke state is inserted, designated by LC, the support projection is situated on an acting line LP, which is spaced apart from the connecting line LC by a predetermined horizontal distance LF in the rotational direction of the swash plate, so as to define the maximum tilt angle of the swash plate.

Abstract: A symmetric pump having a symmetric end cap attached to a symmetric housing is disclosed. The end cap is attachable in a first position or a second position wherein the second position is rotated relative to the housing. A trunnion arm extends in a first direction and a system port opens in a first orientation when the housing is connected to the end cap in a first position. The end cap includes structure such that the housing may be connected in a second position so that the trunnion arm extends in a second direction while maintaining the system port opening in the first orientation. The end cap may be provided with a symmetric porting system. A control device for affecting movement of the swashplate is disclosed. Methods of locking the swashplate into a predetermined position are also taught.

Abstract: An electric motor that has a electric motor and a compression mechanism. The motor and the compression mechanism are accommodated in a single chamber. A single shaft functions as the output shaft of the motor and the drive shaft of the compressor.