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 piston type compressor having a drive plate (swash plate), wherein sliding friction between the drive plate and shoes is reduced and the compressor is made smaller by slidably attaching the shoes engaged with spherical ends of pistons to a shoe holding plate formed with guide grooves in the radial direction and supporting the shoe holding plate by the drive plate through a thrust bearing. The drive plate is connected to an arm of the shaft side through a double slide link mechanism to enable it to be supported by only a front end of the front housing.

Abstract: A variable displacement compressor includes a supply passage for supplying refrigerant gas from a discharge chamber to a crank chamber and a bleed passage for bleeding the refrigerant gas from the crank chamber to a suction chamber. An oil separator is connected to a drive shaft and is located in the bleed passage. The oil separator rotates together with the drive shaft to centrifugally separate lubricant oil from the refrigerant gas that flows in the bleed passage. An oil chamber is formed in a compressor housing for receiving the separated oil. The pressure in the oil chamber is equal to or greater than the pressure in the crank chamber. The lubricant oil rapidly returns to the crank chamber through a return passage.

Abstract: The gas fluid heated by microwave in buoyancy body in liquid makes fluid dynamics. The fluid gas dynamics makes energy in buoyancy body, we can make this enegy use of generator. The gas dynamics is created by compressible fluid dynamics system by tube and fin. We irradiate microwave temperature sensitive magnetic material and control magnetization by curie temperature by heating magnet by microwave irradiation. The differentiation of electromagnetic stress force of magnet makes buoyancy rotator rotate and generate electric energy.

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 compressor for the air conditioning system of an automobile, having a housing and a compressor unit arranged in the housing for taking in and compressing a refrigerant. The refrigerant flows from an intake area through the compressor unit into a discharge area likewise formed in the housing cover, and the housing cover sealingly connects to the housing via connecting members. For reducing a load on the connecting members, the connecting area, through which the connecting members extend, is at least substantially separated from the pressure generated within the compressor.

Abstract: An electrohydraulic actuator comprising: a hydraulic actuator comprising a piston secured to a member to be controlled and capable of moving in a cylinder under drive from a hydraulic fluid; a hydraulic pump feeding both faces of the piston with hydraulic fluid via channels integrated in the walls of the cylinder; an electric motor immersed in the hydraulic fluid, and controlled and powered electrically by an electronic control unit, driving the hydraulic pump in rotation; and a hydraulic accumulator for compensating variations in the volume of the hydraulic fluid; the hydraulic actuator, the hydraulic pump, the electric motor, and the hydraulic accumulator having a common axis of symmetry and being mounted in alignment in a common housing that is leaktight to the hydraulic fluid, thereby forming an axially symmetrical self-contained hydraulic assembly.

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 portable, high capacity air compressor system for charging air tanks over wide pressure ranges with maximum volumetric efficiency is characterized by employing a shuttle piston assembly in which piston pairs are arranged with axially aligned cylinder pairs to reciprocate in response to precession of a wobble plate, and each of the pistons is further characterized by being of one-piece construction with a built-in leaflet-type intake valve in its piston head, and a universal connector between each of the piston pairs and wobble plate which is stabilized within a pair of guide rails.

Abstract: A piston type compressor has a housing, a crank chamber and a drive shaft supported by the housing. A front restriction and a rear restriction are located in the housing. The front and rear restrictions restrict axial movement of the drive shaft. The front restriction restricts forward movement of the drive shaft. The rear restriction restricts rearward axial movement of the drive shaft. A first clearance is located between the rear end of the drive shaft and the rear restriction when the drive shaft is restricted by the front restriction. A second clearance is formed between the piston and a valve plate when the drive shaft is restricted by the front restriction and when the piston is in the top dead center position. The first clearance is narrower than the second clearance. The method of assembly the piston easily sets the first clearance.

Abstract: A swash plate type compressor includes a front head portion having a suction chamber and a discharge chamber sectioned by a partition wall formed on an inner surface of the front head portion, and having at least one upper discharge guide groove and at least one lower discharge guide groove formed in an upper portion and a lower portion of the discharge chamber, respectively, a rear head portion having a suction chamber and a discharge chamber sectioned by a partition wall formed on an inner surface of the rear head portion, and having at least one upper discharge guide groove and at least one lower discharge guide groove formed in an upper portion and a lower portion of the discharge chamber, respectively, to correspond to the upper and lower discharge guide groove of the front head portion, a cylinder installed between the front and rear head portions or inside the front and rear head portions and having a plurality of bores installed such that pistons are capable of sliding and at least one upper discharge

Abstract: In a pump, a plurality of pump chambers are defined by a plurality of diaphragms. A pivotable member is attached to the diaphragms. A rotator has a fitting hole formed in one face eccentrically from a rotation center of rotator. A shaft member is inserted into the fitting hole to connect the pivotable member and the rotator. An entrance edge of the fitting hole is chamfered.

Abstract: A compressor which has a housing defining therein a suction chamber, a discharge chamber and a crank chamber, a drive shaft rotatably supported in the housing, a first end of which penetrates through the suction chamber and protrudes from the housing, and a second end of which is disposed in the crank chamber, a single-headed piston accommodated in a cylinder formed in the housing, and a swash plate integrally rotatably mounted on the drive shaft and coupled with the piston. The cylinder is located between the crank chamber and the first end of the drive shaft so that pressure in the crank chamber acts on the drive shaft in an opposite direction of compressive reaction force acting on the drive shaft. A shaft seal is provided on the drive shaft between the suction chamber and the first end of the drive shaft in order to seal the suction chamber.

Abstract: In a fuel pump pressurizing fuel and supplying the fuel to a fuel injection valve of a vehicle engine, a hardened layer of at least one selected from a nitride layer, a carburated and quenched layer and a carbonitrided layer, and a metal compound layer, on a surface of the hardened layer, higher in corrosion resistance than the hardened layer are formed on one of slide surfaces contacting each other and sliding in fuel.

Abstract: A gasket 36 is interposed between an end face 341 of a front housing 11 and an end face 351 of a rear housing 12. A coned disc spring 37 is interposed between an end face 192 of a cylinder 19 and the end face 341 of the front housing 11. When the end faces 341, 351 are caused to approach each other so as to be joined together, the coned disc spring 37 is first held by the end face 341 of the front housing 11 and the end face 192 of the cylinder 19. When the end faces 341, 351 are caused to approach each other further so as to be joined together, the gasket 36 is held between the end faces 341, 351. Thus, it is ensured that the cylinder and the seal material interposed between the first housing and the second housing are held therebetween.

Abstract: A slant plate-type variable displacement compressor includes a housing enclosing a crank chamber, a suction chamber, and a discharge chamber. The housing includes a cylinder block, and cylinder bores are formed therein. Pistons are slidably disposed within the cylinder bores. A valve member is disposed in a first passage, which communicates between a discharge side of the cylinder bore and the crank chamber. The valve member is controlled by a suction pressure of the cylinder bore. A second passage communicates between the crank chamber and a suction side of the cylinder bore through an orifice for allowing pressure to release. A cross-sectional area of the orifice is variably controlled, such that when compressor operation begins, the cross-sectional area of the orifice is greater than that during a capacity control operation.

Abstract: A multistage piston compressor includes a case and a suction chamber and a discharge chamber provided in the case. A rotary shaft is supported in the case. A valve plate provided in the case includes suction ports and discharge ports. A plurality of bores are provided at predetermined intervals about the axis of the shaft. Pistons are housed in the bores and compress refrigerant by reciprocating in accordance with the rotation of the shaft. An intermediate chamber connects a discharge port with a suction port. The refrigerant is compressed in stages by passing through a plurality of bores via the intermediate chamber. Compression chambers are defined between the pistons and the valve plate. A communication passage is provided for setting the pressures acting on the rear faces of the pistons to an intermediate pressure between the suction pressure and the discharge pressure.

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: A head assembly for use in a compressor having a first compression chamber for compressing a fluid is disclosed. The head assembly includes a manifold housing defining an intake port, an exhaust port and a control valve port and having an outer wall, a first inner wall and a second inner wall. The outer wall and the first inner wall define a suction chamber and the first inner wall and the second inner wall define a discharge chamber. An aperture is formed in the first inner wall for guiding the fluid and oil from the discharge chamber to the control valve port. The second inner wall is internal to the outer wall and the first inner wall and defines an exit chamber. The exit chamber is in fluid communication with the exhaust port and the second inner wall defines a partition between the aperture and the exhaust port such that the oil pools in the discharge chamber.

Abstract: A compressor may include 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 said drive shaft. The compressor also may include a plurality of pistons, and each of the cylinder bores may have an outer radial edge. Moreover, each of the pistons may include a head portion which is slidably inserted inside one of the cylinder bores, and a skirt portion which extends from an end surface of the head portion, in which the skirt portion includes a pair of shoe receiving portions. Each piston also may include a rotation prevention portion which is formed at the skirt portion and prevents the piston from rotating about its axis.

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: In a variable displacement compressor of a piston type, a valve body (34) is movably placed adjacent to a main channel (32) communicating a suction port (26) with a suction chamber (24). The valve body is for variably controlling an opening area of the main channel. A fluid damper (38) is coupled to the valve body to damp vibration of the valve body. In addition, a bypass channel (39) is formed outside of the air damper to communicate the suction port with the suction chamber.

Abstract: A suction chamber and a discharge chamber are defined in a front housing member. A crank chamber is defined between a cylinder block and a rear housing member. A drive shaft passes through the suction chamber and extends from a front end of a housing. The drive shaft is supported by the housing. A shaft sealing assembly for sealing the drive shaft is located in the suction chamber. In the cylinder block and a valve plate, a bleed passage is formed for connecting the crank chamber with the suction chamber. The bleed passage is inclined downward toward the suction chamber. The outlet of the bleed passage is above the shaft sealing assembly. In the suction chamber, a reservoir, which stores lubricating oil supplied through the bleed passage, is surrounds a lower part of the shaft sealing assembly.

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: An external control variable displacement compressor varies its displacement based on the pressure in a control chamber. The compressor has a valve chamber defined in a housing. The valve chamber has an opening to accommodate an electrically operative control valve. The control valve controls pressure in the control chamber due to an external electrical signal. An electrical power supply line is connected to the control valve, the power supply line being in contact with an opening of the valve chamber. The valve chamber opening is surrounded by a circumferential wall. An agonic surface formed on the circumferential wall is constituted of a rounded surface formed by rounding a corner of the opening and/or a chamfered surface formed by chamfering a top of the opening, and is formed on a part of or the entire circumferential wall. The power supply line is to be in contact with the agonic surface.

Abstract: A seal is provided between the housing assembly of a variable displacement compressor and a rotary shaft to seal inside the housing assembly. The seal is retained in a retaining chamber, which is separated from a suction chamber and a control pressure chamber. A refrigerant passage is connected to the retaining chamber to feed a refrigerant to the retaining chamber to cause the refrigerant to contact the seal. The refrigerant passage includes a path extending from outside the housing assembly to the suction chamber through the retaining chamber. A restriction ring having a restriction function guides the refrigerant from the control pressure chamber to the retaining chamber and releases an internal pressure of the control pressure chamber.

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: A lug plate 11 is secured to a drive shaft 7 which is rotatably supported in a housing so as to rotate together with the drive shaft, and a swash plate 12 is operatively connected to the lug plate through a hinge mechanism so as to rotate together with the lug plate and so as to vary an angle with respect to the drive shaft 7. Pistons 17 which are received in cylinder bores la so as to reciprocally move are operatively connected to the swash plate 12, so that not only can a refrigerant be introduced and discharged in accordance with the rotation of the drive shaft 7, but also the stroke of the pistons 17 can be varied by varying the angle of the swash plate 12. A front radial bearing 9B is provided on the outer periphery of a boss portion 11A of the lug plate 11 and a coil spring 16 to bias the swash plate 12 is received in a spring receiving portion 11C formed in the lug plate 11 on the rear side thereof.

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 power transmission mechanism transmits power of an external drive source to a rotary shaft. The transmission mechanism has a first rotor rotated by the external power source. A second rotor is connected to the rotary shaft. The second rotor is coaxial with the first rotor and coupled to the first rotor transmit power to the first rotor. A disconnecting body disconnects power transmission from the first rotor to the second rotor when an excessive transmission torque is generated between the rotors. A dynamic damper is provided in at least one of the rotors. The dynamic damper has a weight that swings like a pendulum. The axis of the pendulum motion of the weight is separated by a predetermined distance from and is substantially parallel to the rotation axis of the corresponding rotor.

Abstract: A shoe for use in a swash plate type compressor, interposed between a swash plate and a piston, has a plane sliding surface, a spherical sliding surface and a side surface. The plane sliding surface, which is substantially a plane, slides with respect to the swash plate. The spherical sliding surface, which is substantially a part of sphere surface, slides with respect to the piston. The side surface is provided between the plane sliding surface and the spherical sliding surface. The side surface includes a chamfered surface adjacent to the plane sliding surface. An angle between the chamfered surface and the extended plane sliding surface ranges from 20° to 80°.

Abstract: A swash-plate-end bearing for the motor shaft in a high pressure cleaning appliance which includes a motor and a reciprocating pump driven thereby, wherein the pistons of said pump rest resiliently on a swash plate driven by the motor whose shaft is rotatably mounted at each end whilst being connected at one end in non-rotatable manner to the swash plate, and which also includes at the swash plate end, a roller bearing having two concentric bearing rings, whereby the outer bearing ring is held in an end plate of the motor whilst the inner bearing ring surrounds the motor shaft, in such a manner as to simplify the operation of assembling the motor shaft and the bearing and to make it as independent as possible from unavoidable manufacturing tolerances, it is proposed that the inner bearing ring should surround the motor shaft in floating manner.

Abstract: A variable displacement compressor 10 includes a wall 1a that seals a cylinder bore 14, and is integrally formed with a cylinder block 1. A rear plate 5 having a plate-like shape is fastened via a gasket 6 to a location that extends to the inner rear side of a wall 1a. Suction valves 40 and discharge valves 44 are disposed within the wall 1a.

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: 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 tandem pump comprising first and second pumps connected by an interface. An interface for connecting an end cap of a first pump to a housing of a second pump. An interface kit for connecting two pumps in axial alignment to form a tandem pump.

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 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: An axial plunger pump which does not need bellows by restricting fuel to a cylinder bore configuring a pump portion and by lubricating the other portion with oil. The high pressure fuel pump includes a plunger reciprocating according to a shaking movement of a swash plate, a cylinder block forming a pump chamber together with the plunger, and a sealing member provided between the plunger and a cylinder bore for sealing oil leaked from the pump chamber to a chamber surrounding the pump chamber, wherein oil in the oil chamber is supplied from the outside of the high pressure fuel pump.

Abstract: When one piston 3A and 3B moves to the forward edge by the pressured fluid supplied to the head side pressured chamber 5A and 5B, two communicating paths 11A and 11B communicates the head side pressured chamber 5A and 5B with the rod side pressured chamber 5B and 5A of other piston 3B and 3A. In a rod holding unit plate, the rod holding unit plate is provided such that one engaging unit 21A and 21B of the rod holding unit plate is in sliding contact with the side surface of this piston rod 4A and 4B to regulate the oscillation during one piston rod 4A and 4B is making forward or is setting back. At the same time, the rod holding unit plate is provided such that other engaging unit 21B and 21A of the rod holding unit plate 21 is engaged in the hollow 25 of other piston rod 4B and 4A located at the forward edge to engage the returning operation of the piston rod.

Abstract: Between a cylinder block and a housing, there is disposed a valve base plate. The valve base plate is formed with mutually isolated first and second intake openings for fluidly communicating each of piston chambers in the cylinder block with an intake chamber defined in the housing. A reed valve element is incorporated with each piston chamber. The reed valve element is arranged to open the first and second intake openings with the aid of a fluid when the piston is moved away from the reed valve element and close the first and second intake openings with the aid of the fluid when the piston is moved toward the reed valve element. Due to provision of the two, viz., first and second intake openings, opening movement of the reed valve element is carried out along with a twisting motion of the same.

Abstract: A compressor includes a suction chamber and a discharge chamber in the housing. A first component is secured to a second component to form the housing. A first defining wall and a second defining wall are located in the second component to define the suction chamber and the discharge chamber. The second defining wall is located radially inward of the first defining wall. An inner fastener is located radially inward of the first defining wall and secures the first component to the second component.

Abstract: A variable displacement swash plate type compressor which incorporates a lubrication passage formed in a cylinder block and crankcase, and a spray nozzle disposed at the crankcase end of the lubrication passage. The lubrication passage provides fluid communication between an oil sump and the spray nozzle, and the spray nozzle causes lubricating oil to be efficiently distributed as a fine mist or spray to the crank chamber. The lubrication passage and spray nozzle maximize the flow of refrigerant gas and lubricating oil to the crank chamber under all operating conditions providing cooling and lubrication to the internal moving components within the crankcase.

Abstract: A motor-driven compressor performs suction, compression, and discharge of refrigerant. The compressor has four cylinder bores and four pistons. A swash plate is integrally rotated with a drive shaft. A transmission mechanism transmits rotation of the swash plate to the pistons. The ratio of the discharge pressure to the suction pressure when the discharge displacement of the compressor is maximum, that is, the compression ratio, is in a range of 2 to 4.5. The compressor is constructed to permit the size of the motor to be minimized.

Abstract: A variable capacity type compressor has a tiltable swash plate and pistons. A control valve is arranged to change the pressure in the crank chamber, to vary the capacity of the compressor by changing the inclination angle of the swash plate by changing the pressure in the crank chamber. The control valve has independently movable first and second plungers and a coil arranged around the first and second plungers so that the coil generates an electromagnetic attraction force acting on and between the first and second plungers. First and second valve elements provided on the first and second plungers can adjust the degree of opening of the first and second fluid passages.

Abstract: A multi-stage compressor includes a first bore for a primary compression and a second bore for a secondary compression. A first piston is accommodated in the first bore and a second piston is accommodated in the second bore. A piston ring is attached to the first piston and a second piston ring is attached to the second piston. The inner diameters of the bores, the outer diameters of the pistons, and the outer diameters of the piston rings are equal to each other respectively. Thus, the bores are easily formed. Since only one type of piston and one type of piston ring are required to be manufactured, the manufacture of the above mentioned products is simplified. As a result, manufacture of the compressor becomes easy and the manufacturing cost is reduced.

Abstract: A plurality of parallel compression paths connect a suction chamber to a discharge chamber. A plurality of compression chambers are formed in each compression path. Fluid is drawn to the suction chamber and is then compressed in the compression chambers in each compression path in a plurality of compression stages. Afterward, the fluid is discharged from the discharge chamber. A first compression chamber that corresponds to a predetermined compression stage in each compression path is connected to a second compression chamber that corresponds to a subsequent compression stage in the compression path through a communication chamber. The communication chamber is provided separately for each compression path.

Abstract: A suction port as a fluid port of a piston type compressor is contoured with reference to a middle line passing through a middle point of a maximum length of the suction port in the longitudinal direction of the suction valve and perpendicularly crossing a reference line extending in the longitudinal direction. The middle line divides the suction port into a first section positioned on the proximal end side and a second section positioned on the distal end side. An area of the second section is greater than an area of the first section. A width increasing region is disposed in which the width of the suction port becomes gradually greater from the proximal end side to the distal end side, and the length of the width increasing region occupies a major part of the maximum length of the suction port.

Abstract: variable displacement compressor has a drive shaft extending through a crank chamber. A lug plate is integrally fixed to the drive shaft. A drive plate is connected to and driven by the lug plate by a hinge mechanism. The drive plate inclines with respect to the drive shaft to vary the displacement of the compressor. The hinge mechanism has a linear guide on the lug plate and a pin projecting from the drive plate toward the lug plate. A bearing surface engages the pin. The pin has an axis that intersects an axis of the guide. The axis of the pin is parallel to the axis of the drive shaft when the compressor operates with a maximum load.