Abstract: In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, comprising a machine shaft rotatably supported in a housing with a plurality of pistons arranged circularly around the machine shaft and an annular pivoting disc extending around, and being driven by, the machine shaft, wherein the annular pivoting disc engages the pistons via a joint arrangement disposed on a driver extending from the shaft for transmitting shaft drive forces to the pistons, the annular pivoting disc being supported by a sliding body mounted on a shaft and being pivotable about a hinge axis oriented transversely to the machine shaft, the joint arrangement of the driver is located outside a main center-plane, which extends perpendicularly to the hinge axis and through the axis of rotation of the machine shaft.

Abstract: A method of adjusting a rotary machine includes the steps of press fitting an adjustable member to one of a housing and a rotary body where the adjustable member is arranged to a reference position at which movable amount or a rotary body is zero, and adjusting the movable amount of the rotary body in a direction of a rotary axis to the predetermined amount by varying a position of the adjustable member that is press-fitted to the one of the housing and the rotary body from the reference position by the predetermined amount in a direction in which the movement restricting part and the contacting part contacting with each other are separated from each other.

Abstract: In a swash-plate compressor having a shoe slidably coupling a coupling portion of a piston to a swash plate, the coupling portion has a spherical contact surface and the shoe has a spherical surface slidable along the contact surface. At least one of the contact surface and the spherical surface has an oxide film retaining a number of self-lubricating particles. The swash plate is attached to a drive shaft which is rotatable. The piston performs reciprocal movement by the rotation of the swash plate.

Abstract: A compressor, in particular an axial piston compressor having an axial piston drive mechanism for the intake and compression of a coolant, has a drive shaft for the drive mechanism with radial bearings of the shaft located at the front and at the rear of the compressor housing. A drive side having a pulley is defined as the front of the compressor, and the compressor includes at least one axial bearing for the shaft, the axial bearing being located in the cylinder head or pressure cover at the rear.

Abstract: A shaft seal for sealing an outer circumferential surface of a rotary shaft to a housing includes a lip seal. The lip seal includes a lip body, a lip portion, a support portion and a receiving portion. The lip body is fixed at a housing side. The lip portion extends from the lip body and has inner and outer circumferential surfaces. The inner circumferential surface of the lip portion is in contact with the outer circumferential surface of the rotary shaft. The lip portion is deformable. The support portion is formed at the outer circumferential surface side of the lip portion for applying tensile force to the lip portion when the lip portion is deformed toward the inner circumferential surface side of the lip portion. The receiving portion is formed at the outer circumferential surface side of the lip portion for receiving the pressure in the housing.

Abstract: A pump includes a pump housing, a rotating shaft extending through the pump housing, a plurality of pistons, and a plurality of control sleeves. Each piston may be at least partially, slidably contained within a respective piston sleeve. The pistons may also be be operably coupled to the rotating shaft such that rotation of the shaft rotates and reciprocates the pistons. Each control sleeve may be slidably disposed on a respective one of said piston sleeves and operable to selectively vary the amount of fluid delivered by the pump.

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

Abstract: In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, including a machine shaft, a plurality of pistons are arranged, at the same distance from the machine shaft, on a cylinder envelope defined by the axes of the pistons and extending around the machine shaft, and an annular pivoting disc which is driven by the machine shaft and which engages the pistons via a joint arrangement, the joint arrangement has an at least partially spherical receptacle, in which at least one sliding element structure is arranged moveably relative to the associated piston and relative to the pivoting disc, including a first sliding element having a first sliding face in the form of a spherical segment with a first geometric center (M1, M3), and a second sliding element having a second sliding face in the form of a spherical segment with a second geometric center (M2, M4) arranged at a distance from the first geometric center.

Abstract: In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, including a machine shaft rotatably supported in a housing, a plurality of pistons arranged circularly around the machine shaft in the housing, and an annular pivoting disc driven by the machine shaft and engaging the pistons via a joint arrangement, the pivoting disc being connected in an articulated manner to the machine shaft via a driver for transmitting the machine shaft drive forces to the pistons and mounted on a machine shaft-supported sliding body so as to be pivotable about a hinge axis oriented transversely to the machine shaft, the sliding body has an elongated recess which is open at one axial end for receiving the driver and the sliding body further includes at its inside adjacent the machine shaft a cavity, which is in communication with a bore forming a discharge passage extending through the machine shaft.

Abstract: A pumping element for a hydraulic pump is provided. The pumping element includes a cylinder forming a compression chamber and having a discharge port. A piston having a pressure surface, a spill port, and a passageway connecting the pressure surface with the spill port is disposed in the cylinder for reciprocal movement between a first position and a second position. The pressure surface of the piston is adapted to increase the pressure of a fluid disposed in the compression chamber as the piston moves between the first position and the second position. The pressurized fluid flows through the discharge port of the cylinder. A metering sleeve is disposed around the piston and is configured to selectively cover the spill port as the piston reciprocates between the first and second positions. The metering sleeve has a groove that is adapted for fluid communication with the spill port as the piston reciprocates between the first and second positions.

Abstract: A sensor for a variable displacement pump is provided. The pump has a housing containing a swashplate that is adapted to rotate about an axis. The sensor includes a magnet connected to the swashplate to rotate with the swashplate. A semiconductor chip is disposed proximate the magnet and within the housing. A control is adapted to direct a current through the semiconductor chip and to determine the voltage across the semiconductor chip. The control is further adapted to determine the angle of the swashplate relative to the housing based on the determined voltage.

Abstract: In a swash-plate compressor for compressing a fluid, the compressor includes a cylinder block having a cylinder bore and a piston having a first end portion reciprocally movable in the cylinder bore and a second end portion opposite to the first end portion. The second end portion has a pair of engaging portions faced to each other with a space left therebetween and a side wall portion connecting the engaging portions to each other. The compressor further includes a swash plate having a part inserted between the engaging portions and driven to rotate and a pair of sliding members interposed between the engaging portions and the swash plate, respectively. Each of the sliding members has a flat portion slidably contacted with the swash plate and a spherical portion opposite to the flat portion. Each of the engaging portions has a contact surface slidably contacted with the spherical portion. Each of the contact surfaces extends to the side wall portion.

Abstract: In a compressor having a cylinder head defining a refrigerant suction chamber and a refrigerant discharge chamber, the cylinder head is provided with a space located between the refrigerant suction chamber and the refrigerant discharge chamber. The cylinder head is disposed at one end of a compressor housing so that each of the refrigerant suction chamber and the refrigerant discharge chamber communicates with a plurality of cylinder bores disposed within the compressor housing and spaced from one another in a circumferential direction. In each cylinder bore, a piston reciprocally movable is disposed.

Abstract: A swash plate compressor comprises a swash plate located for rotation in a housing and a compression unit that forms a part of the housing. The compression unit has cylinder bores that guide pistons in reciprocation as the swash plate rotates. Each cylinder bore has a cross section formed of any other closed curve than a circle. The closed curve is defined by curve elements and straight elements.

Abstract: A pump includes a stationary pump housing having a housing chamber, a rotating pump shaft having a central longitudinal axis and extending through a proximal end of the pump housing into the housing chamber, and a rotating swash plate fixed to the pump shaft. The swash plate includes a pump inlet passage with an opening in a surface of the rotating swash plate. A plurality of reciprocating pump pistons are also included with the pump, each pump piston is at least partially contained within a respective pump chamber formed in the stationary pump housing and has an axial bore extending completely therethrough. The axial bore of each pump piston may selectively communicate with the swash plate surface opening to permit the supply of inlet fluid to the axial bore from the inlet passage. A sealing plate substantially seals the swash plate surface opening from a flow of fluid into the inlet passage from the swash plate surface opening.

Abstract: A control valve has a valve body for opening and closing a valve hole and a solenoid mechanism for urging the valve body by energizing a solenoid. The solenoid mechanism includes a yoke, a plunger housing, a fixed core and a plunger. The yoke accommodates the solenoid and forms a magnetic path. The plunger housing made of stainless steel connects with the yoke, and has a central axis. The fixed core connects with the yoke. The plunger is accommodated in the plunger housing and connects with the valve body. The plunger is attracted to the fixed core to move in the direction of the central axis by applying electromagnetic force from the solenoid. Black oxide treatment is performed to the yoke after the plunger housing is brazed to the yoke.

Abstract: A support structure carrying a thrust load of a compressor has a swash plate which contributes to a compressing operation by rotating according to rotation of a rotating shaft which is rotatably supported by a housing. The swash plate is rotatably supported with respect to the housing, and the support structure includes a thrust needle roller bearing having double-row needle rollers. The support structure carrying a thrust load of a compressor and the thrust needle roller bearing are thus obtained, with an improvement in inflow and outflow of a lubricating oil, a reduction of the differential slip of the needle rollers, and an improvement in strength durability.

Abstract: The present invention provides a tandem pump unit that includes: a first hydraulic pump and a second hydraulic pump respectively having a first pump shaft and a second pump shaft respectively having adjacent ends connected together so that the first and second pump shafts are coaxially aligned and non-rotatably connected in tandem; a common housing for accommodating the first hydraulic pump and the second hydraulic pump; and a first center section and a second center section that respectively support the first and second hydraulic pumps.

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 compressor that inhales refrigerant gas from an external refrigerant circuit, compresses the inhaled refrigerant gas and discharges the compressed refrigerant gas, comprising a cylinder block having a plurality of bores, and a suction muffler chamber having a suction port connected to an external refrigerant circuit installed on the outer circumferential surface of the cylinder block, a front housing coupled to the front side of the cylinder block and forming a crank chamber, a driving shaft supported so as to freely rotate with respect to the cylinder block and the front housing, a single-headed piston connected to a slanting plate element mounted on the driving shaft and linearly reciprocating inside the bores of the cylinder block, and a rear housing connected to and closing the rear side of the cylinder block, having a discharge chamber and a suction chamber, and having two or more suction chamber connecting passages at an upstream side of the suction chamber.

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 pump system for delivering cryogenic liquids is proposed that is suitable, for example, for refueling motor vehicles with H2. It consists of a container for receiving the cryogenic liquid, in which at least one pump is arranged that is designed as a reciprocating pump with connecting rod actuation and spring recover. Pump cylinder (10) of the reciprocating pump is divided by means of plunger (24, 37) into two chambers (a and b) that are arranged on the pressure side or the induction side. By exerting tensile forces on connecting rod (29), in the pressure stroke the cryogenic liquid that is located in the container is initially trapped in chamber (b). When connecting rod (29) is returned to its starting position by return spring (23), the liquid that is trapped in chamber (b) is then hurled without pressure into chamber (a). In the subsequent pressure stroke, the liquid is finally released via a gap (d) to a pressure housing and from there to the consumer by exerting tensile forces on connecting rod (29).

Abstract: A compressor has a pulley for transmitting torque from an external drive source to a rotary shaft to drive a compression mechanism. The pulley has a pulley body. The compressor has a mass body located in a range that is radially inward of the outer circumference of the pulley. The mass body swings about an axis that is spaced from the rotation axis of the pulley body by a predetermined distance and is substantially parallel to the rotation axis of the pulley body.

Abstract: A swash plate-type compressor includes a cylinder block, a drive shaft, a swash plate, a plurality of pistons, and a pair of shoes. The cylinder block has a plurality of cylinder bores formed therethrough. The drive shaft is rotatably supported by the cylinder block. The swash plate is mounted on the drive shaft for rotation therewith. Each of the plurality of pistons is slidably positioned within a respective one of the cylinder bores to reciprocate therein. Each of the pistons has a pair of substantially semispherical cavities formed at an end thereof. A pair of shoes is positioned between each of the pistons and the swash plate. Each shoe has a semispherical portion adapted to be positioned within one of the substantially semispherical cavities of the pistons and a flat portion slidable along a surface of the swash plate. A first concave portion is formed in the flat portion. A second concave portion is formed in the semispherical portion.

Abstract: A muffler is integrally incorporated into the rear housing of a compressor. In this way, the muffler reduces the overall size, weight and cost of the compressor. The fluid flow is directed through the muffler and discharge chamber in such a way as to fully utilize the volume effectively to reduce flow turbulence, while not causing any significant flow loss or delay in fluid supply.

Abstract: A multi-cylinder compressor includes a valve plate having a plurality of cylinder suction ports formed therethrough, and a plurality of cylinder bores centered on an arc having a radius (R). The cylinder bores are substantially equally spaced from each other, and have a diameter (D). The compressor also includes a suction chamber having a substantially annular shape and adapted to be in fluid communication with each of the cylinder bores via the suction ports. Moreover, a center of a first of the suction ports is radially offset in a predetermined direction from a center of a predetermined suction port by a first angle, in which the predetermined suction port has a diameter (d), and the first angle equals {[(360°/N)·([N−1]−n)]+X°}.

Abstract: Smaller and lighter hydraulic pump/motors are provided 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, is each positioned to be 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 blow-by entering from the valve end of each cylinder. A plurality of sealing members, each located near the open end of each cylinder, substantially eliminates blow-by from this lubricating passageway, thereby significantly increasing volumetric efficiency.

Abstract: Smaller and lighter hydraulic pump/motors are provided 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, is each positioned to be 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 blow-by entering from the valve end of each cylinder. A plurality of sealing members, each located near the open end of each cylinder, substantially eliminates blow-by from this lubricating passageway, thereby significantly increasing volumetric efficiency.

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 pump unit having a pump cylinder block mounted in a housing on an end cap. The cylinder block is driven by a pump input shaft, where the input shaft has a first driven end and a second end, and the second end extends through the end cap and out of the housing.

Abstract: A positive displacement hydraulic pump/motor assembly (1) includes a rotary cylinder block (3) having a central axis (5) and a generally circular array of cylinders (6) disposed around the axis. A corresponding plurality of pistons (10) is reciprocably disposed within the respective cylinders. A drive shaft (12) extends through a bore (13) formed in the cylinder block to effect rotation of the cylinder block about the central axis. A drive plate (15) is disposed at one end of the cylinder block to effect sequentially staggered reciprocation of the pistons in response to rotation of the cylinder block. A stationary valve plate (20) is disposed at an opposite end of the cylinder block, the valve plate having a valve face (21) adapted for sliding rotational engagement with a complementary mating face (22) formed on the cylinder block.

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 pump housing assembly includes a housing, a hub portion, and a flange. The housing has an end cowling defining a transition from a central portion of the housing to a transverse end portion. The hub portion extends longitudinally outwardly from the transverse end portion of housing. The flange extends radially outwardly from the outward end of the hub and is in spaced longitudinal relation to the end of the cowling to create a space to receive a head of a mounting bolt. The flange has an outer periphery with a pair of tangentially extending slots having an open end. The space for receiving a head of a mounting bolt is less than the length of a shank of a mounting bolt, to minimize the length of the housing. The slots have a width sufficient to receive the movement of a shank into and out of the open ends of the slots.

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

Abstract: A hydraulic system, such as a fuel injection system, includes a fixed displacement pump with at least one pump piston. A sleeve surrounds each pump piston and provides the method by which fluid displaced by the pumping stroke of the pump piston is directed either to a high pressure area in the pump or a low pressure area. The sleeves are a portion of an electro-hydraulic controller that includes a mechanical bias to bias the pump to a high output position when a pressure differential between the outlet area and the inlet area is relatively low, such as at cold start up. This aspect facilitates priming of the system. In addition, the controller includes a biasing hydraulic surface in opposition to the mechanical biaser that serves to bias the pump to its low output position when the pressure differential between the outlet area and the inlet area is relatively high. This aspect prevents over pressurization in the event that electric current to the controller is disrupted.

Abstract: A tandem pump comprising first and second pumps connected in tandem by an interface. Each pump has a housing and an end cap containing hydraulic porting. The interface connects the end cap of one pump to the housing of the other pump.

Abstract: In an axial piston pump, a plurality of reciprocating pistons are at least partially positioned within a barrel. The barrel includes a ring shaped high pressure collection cavity that is positioned between the piston chambers and the outlet of the pump. In order to minimize potential loses due to leakage from the ring shaped collection cavity, the barrel is made from a casting that utilizes a ring shaped core supported in a mold. This facilitates the formation of the ring shaped cavity while insuring location and dimensional tolerances, and assisting in the latter machining of the casting to its final form.

Abstract: An oil separator is provided on a bleeding channel inside the shaft 16. By integral rotation of the shaft 16 and a rotary valve, oil contained in a refrigerant gas is centrifuged via the oil separator. The separated oil is supplied to an interface between the rotary valve and a cylinder block, namely, a clearance portion of the rotary valve. The separated oil is also supplied into a clearance between a piston and a cylinder bore 12a via a suction port and a suction channel.

Abstract: A HEUI system uses a fixed displacement, radial piston pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the radial piston pump to minimize parasitic power drains on the engine. The radial piston pump includes an orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.

Abstract: A positive displacement hydraulic pump/motor assembly (1) includes a rotary cylinder block (3) having a central axis (5) and a generally circular array of cylinders (6) disposed in parallel relationship around the axis. A corresponding plurality of axial pistons (10) is reciprocably disposed within the respective cylinders. A drive shaft (12) effects rotation of the cylinder block about the central axis and a drive plate (15) is disposed at one end of the cylinder block (3) to effect sequentially staggered reciprocation of the pistons (10) in response to rotation of the cylinder block. A stationary valve plate (20) is disposed at an opposite end of the cylinder block. The valve plate (20) includes a valve face (21) adapted for sliding rotational engagement with a complementary mating face (22) formed on the cylinder block.

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: A HEUI system uses a fixed displacement, piston pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the pump to minimize parasitic power drains on the engine. The piston pump includes an orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.

Abstract: A hydrostatic axial piston machine has a cylinder block with bores holding reciprocating pistons, a swashplate supporting the pistons, and control cams to supply the bores with hydraulic fluid. The swashplate is a pivoting cradle mounted on friction bearings in a cradle receptacle. Hydraulic fluid channels empty into the cradle receptacle and are in communication with supply channels in the cradle connected to the control cams. An actuator piston to adjust the cradle is located between two friction bearing segments of the cradle receptacle and has a toothed rack segment engaging a gearing segment on the back side of the cradle.

Abstract: A variable displacement compressor includes a housing having a suction chamber. A crank chamber is defined in the housing. A valve plate assembly is located in the housing. A drive shaft is supported in the housing. A radial bearing is located in the housing. A holding bore houses the rear end of the drive shaft and the radial bearing. The holding bore is connected to a holding space. A passage connects the holding space and the suction chamber. A restricting member is located in the holding space. The restricting member restricts axial movement of the drive shaft and divides the holding space into a first region and a second region. A clearance is formed between the restricting member and the valve plate assembly. The clearance disappears when the pressure of the crank chamber is increased rapidly.

Abstract: A housing assembly for a refrigerant compressor in an air conditioning system includes a forward housing portion, and a rearward housing portion. The two mate together to contain the internal components and seal the compressor. A clamp engages the forward and the rearward housing portions and is rotated to compress the two together. It maintains a desired clamping force under various operating and environmental conditions.

Abstract: The invention concerns a pump for pumping a first liquid, called transferred liquid, and comprising a main unit (18) for pumping the transferred liquid actuated by an auxiliary unit (20) pumping a second liquid, called working liquid. The main (18) and auxiliary (20) units are housed in a casing (16) generally cylindrical in shape. The main unit (18) comprises at least two valves (36, 38), for respectively sucking up and delivering the transferred liquid, borne by a valve body (40) housed in the casing (16). Each valve (36, 38) communicates with two chambers, respectively a suction chamber (46) and a delivery chamber (48) for the transferred liquid, defined by opposite surfaces (50, 52) provided in the valve body (40) and the casing (16). Said surfaces (50, 52) comprise two matching shoulders (50E, 52E) pressed against each other so as to form a tight joint plane separating the suction chamber (46) and the delivery chamber (48).

Abstract: A refrigerant compressor includes a front housing, a cylinder block, a rear housing, and a valve plate positioned between the cylinder block and the rear housing, in which the valve plate has a suction hole formed therethrough. The compressor also includes a suction chamber and a suction valve reed formed on the valve plate. The compressor further includes a limiting recess formed within an end of the cylinder block adapted to receive the suction valve reed. The limiting recess includes an arced segment intersecting a center axis of the suction valve reed. Moreover, the portion of the arced segment which intersects the center axis of the suction valve reed has a corresponding tangential line at the point of intersection which forms an oblique angle relative to the center axis of the suction valve reed.

Abstract: The invention relates to a hydraulic device provided with a housing having at least a first line connection and a second line connection and, if appropriate, further line connections, a rotor which can rotate in the housing and chambers which are alternately connected to one of the line connections as a result of the rotation of the rotor. According to the invention, chambers are connected by connecting lines in which there are means for closing the connecting line after a limited volume of fluid has flowed through the connecting line in one direction.

Abstract: In a fluid apparatus used as a compressor, a swing support member is constructed of a hook-type adjustable joint, and supports a swing member in capable of swinging while restricting the swing member from rotating about a center axis of a shaft of the compressor. A variable mechanism portion is constructed of a rotary member rotatable around the shaft, the swing member and the like. A slant center around which the swing member swings is made to substantially correspond to a center of gravity of the variable mechanism portion. Therefore, a slant moment, for changing a slant angle of the swing member, is not structurally generated. Accordingly, even when the compressor operates, large vibration and large noise can be prevented, thereby improving durability of the compressor.

Abstract: The invention relates to a hydraulic device as a pump or a motor, having a rotor which is coupled to the shaft, chambers with a volume which, on account of the rotation of the rotor, varies between a minimum value and a maximum value, switching means for successively connecting a chamber to a first line connection and the second line connection during rotation of the rotor. During switching of the connection by means of the switching means, the volume of the chamber changes, and to avoid pressure peaks or cavitation, there are connecting lines between the chambers. The connecting lines are provided with closure means which close the connecting line after a limited volume of fluid has flowed through the connecting line in one direction.