Abstract: A dual pump apparatus having two pumps mounted in a housing, where the housing comprises two elements mounted on opposite sides of a hydraulic mounting member or center section. The pumps are mounted on one side of the hydraulic mounting member in a pump cavity, and the center section and second housing element form a gear cavity in which gears to connect the two pump input shafts are located. Various charge pumps or auxiliary pump configurations are disclosed, including one embodiment where the input shaft gears themselves may act as a charge pump for the pump assembly.

Abstract: A compressor is disclosed having a gas extraction passage, internally formed in a drive shaft and continuously communicating with a crank chamber and a suction chamber, that has an inlet portion, to be exposed to the crank chamber, is formed in the drive shaft in a radial direction. As a result, mist-like oil accompanied by blow-by gas tending to flow into the gas extraction passage initially impinges upon and adheres to an inner peripheral surface of the inlet portion of the gas extraction passage due to rotational movement of the drive shaft. Namely, oil separation (gas-liquid separation) occurs at the inlet portion of the gas extraction passage. Then, oil separated from the blow-by gas at the inlet portion of the gas extraction passage is forcibly returned to the crank chamber due to a centrifugal force caused by rotational movement of the drive shaft. Accordingly, the compressor has a structure in which oil accompanied by blow-by gas is hard to escape the suction chamber.

Abstract: A piston type compressor includes a housing forming a cylinder bore. A drive shaft is supported by the housing. A cam plate is coupled to the drive shaft and is rotated by the rotation of the drive shaft. A piston is accommodated in the cylinder bore and is coupled to the cam plate. The rotation of the cam plate is converted into the reciprocating movement of the piston. In accordance with the reciprocating movement of the piston, gas is introduced into the cylinder bore, is compressed and is discharged from the cylinder bore. Compression reactive force is generated in compressing the gas by the piston, is transmitted to the housing through a compression reactive force transmission path and is received by the housing. A vibration damping member is made of a predetermined vibration damping alloy and is placed at least one location along the compression reactive force transmission path.

Abstract: A housing for a hydraulic pump is provided. The pump has an input shaft connected to a swashplate, a plurality of pistons, a plurality of check valves, and a metering device having an actuator. The housing includes a first housing member having a fluid inlet, a shaft bore adapted to receive the input shaft, and a swashplate bore adapted to receive the swashplate. A second housing member has a plurality of cylinders adapted to slidably receive the plurality of pistons and a plurality of check valve bores that are in fluid communication with the cylinders and are adapted to receive the plurality of check valves. The second housing member also includes an actuator bore configured to receive at least a portion of the actuator, a collector cavity in fluid communication with each of the check valve bores, and a fluid outlet in fluid communication with the collector cavity.

Abstract: A swash plate compressor comprises a swash plate rotated by a drive shaft and a piston that reciprocates in a cylinder bore by the rotation of the swash plate. The piston includes a tail and a pair of shoes retained in the tail. The shoes sandwich an outer periphery of the swash plate. Each shoe has a receiving face for receiving the outer periphery of the swash plate. A central point of the receiving face is located off a common plane including an axis of the piston and that of the drive shaft.

Abstract: A pump exerts pressure on fluid that has higher saturation pressure than atmospheric pressure at room temperature in a fluid reserving chamber in a fluid tank. The pump is located near the fluid tank. The pump has a housing and a heat generating mechanism. The housing defines a pump chamber, a motor chamber and a communication passage between the pump chamber and the motor chamber and includes at least one introducing port for introducing the fluid from the fluid reserving chamber into the housing and a bleeding port located above the introducing port for returning the fluid from the housing to the fluid reserving chamber. The heat generating mechanism is located in the housing. The fluid circulates into the housing through the introducing port and out of the housing through the bleeding port for substantially reducing the temperature in the housing.

Abstract: A metering pump includes an actuating mechanism, and a plurality of piston cylinders coupled to the actuating mechanism. A first of the cylinders has a working volume that differs from a second of the cylinders. The actuating member is centrally located and the cylinders are arranged radially about the actuating mechanism. The working volume of the cylinders can be varied by adjusting the spacing of the cylinders from the actuating mechanism, thus varying the stroke of pistons housed within the cylinders, and/or by providing the cylinders with different inner diameters. A method of metering fluids includes independently adjusting stroke of a plurality of pistons to adjust the volume of metered fluid, and selecting different cylinder diameters to adjust the volume of metered fluid.

Abstract: A compressor for an automotive air conditioning system includes a cylinder head that comprises a mixing chamber, suction chamber and discharge chamber. The cylinder head comprises a first annular wall defining a mixing chamber and a second annular wall disposed about the first annular wall and spaced apart therefrom to define the suction chamber that communicates with the suction ports to the cylinder chambers. The discharge chamber is disposed about the second annular wall and communicates with the discharge ports. Refrigerant flows through the mixing chamber in a swirling or other turbulent pattern and into suction chamber through circumferentially spaced openings. By providing the mixing chamber and isolating the mixing chamber from the suction chamber, pressure pulsation resulting from opening of the suction ports to admit refrigerant is reduced.

Abstract: A mounting flange for housing a bearing cup of a roller bearing is disclosed. The mounting flange includes a recess sized to receive the bearing cup. A radial wall is defined by the recess and an outer periphery of the mounting flange. The radial wall includes at least one region of greater radial thickness than the radial thickness at another region. The at least one region of radial thickness defines at least one ear. The mounting flange also includes at least one flexibility pocket in the at least one ear. The flexibility pocket is configured to provide substantially uniform, radial deformation to the mounting flange when the bearing cup is fit into the recess.

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 a connecting line after a limited volume of fluid has flowed through the connecting line in one direction.

Abstract: A swash type compressor includes sleeves which are fixedly fitted in cylinder bores. The lengths of the sleeves in an axial direction are greater than the lengths of the cylinder bores in the axial direction. A sleeve end of each of the sleeves is flush with an end surface of a cylinder block defining the cylinder bores. The opposite sleeve end of the sleeve extends beyond the cylinder bore and away from the opposite end surface of the cylinder block.

Abstract: A high pressure piston pump includes a housing having a low pressure fuel inlet and a high pressure fuel outlet; at least two pistons disposed in the housing; a driveshaft for supplying power to drive the at least two pistons; and a bypass valve fluidly connected to at least one of the at least two pistons to deactivate the at least one piston. A method of varying the flow output of a high pressure piston pump having at least two pistons includes deactivating at least one of the two pistons by directing fluid displaced by the at least one piston to a bypass valve.

Abstract: This invention relates to a wind mill which is designed to convert rotational energy to mechanical energy to drive one or more pistons to raise a liquid such as water to an elevated location if necessary at a positive pressure. In addition, the present invention may be adapted to pressurize a medium, such as a gas, for storage in a reservoir.

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 therein, at least one upper disc

Abstract: The invention relates to a hydrostatic machine (1) comprising at least one first hydrostatic unit (E1) and one second hydrostatic unit (E2), each hydrostatic unit (E1, E2) comprising respective pistons (14a, 14b) guided in respective cylinder drums (13a, 13b) and supported by respective swiveling bodies (17a, 17b) that can be adjusted by respective adjustment devices (6a, 6b), and further comprising respective control bodies (25a, 25b). A one-piece main housing body (2) radially surrounds the cylinder drums (13a, 13b), the control bodies (25a, 25b), and the adjustment devices (6a, 6b) of both hydrostatic units (E1, E2), and assigns pressure channels for supplying a pressure medium to and discharging it from the control bodies (25a, 25b) of both hydrostatic units (E1, E2). A first add-on housing body (3a) is disposed on a first side of the main housing body (2), and bears a swiveling body (17a) of the first hydrostatic unit (E1).

Abstract: A diaphragm pump comprises a two part casing formed of a front cover (10) and a back cover (12). A diaphragm plate (14) extends across the covers (10,12) and is secured therebetween when the covers (10,12) are fastened together. The diaphragm plate (14) has a plurality of similarly defined circular regions (16). The front cover (10) has substantially axially aligned inlet and outlet ports (18), each leading to mutually exclusive inlet and outlet chambers (22,24) respectively. A valve housing (26) is securable inside the front cover (10) and has defined therein an outlet dished valve seat (28) with a correspondingly concave resilient valve (30) seated therein. The outlet valve seat (28) has fluid passages therethrough. A plurality of inlet valve seats (34) is provided, equal in number to the number of regions, each being similarly dished and having a correspondingly concave resilient valve (36) seated therein. Each inlet valve seat (34) has fluid passages therethrough.

Abstract: A reciprocating refrigerant compressor includes a cylinder block having a cylinder bore, and a compression chamber defined within the cylinder bore. A cylinder head has a low-pressure chamber for receiving refrigerant gas to be drawn into the compression chamber, and is coupled to one end face of the cylinder block. A valve plate is arranged between the compression chamber and the low-pressure chamber, and includes an inlet port for guiding the refrigerant from the low-pressure chamber into the compression chamber. An inlet valve opens and closes the inlet port and has an end whose shape is adapted to a shape of the inlet port. The shape of the inlet port is non-circular, and a portion of an opening edge of the inlet port protrudes into the inlet port. Tangential lines drawn from the protruding portions intersect the opening edge of the inlet port at at least two points.

Abstract: A refrigeration suction mechanism used in a piston type compressor. The compressor comprises a rotary shaft, a plurality of pistons, a compression chamber and a rotary valve. The pistons are arranged in a circumference of the rotary shaft to reciprocate in conjunction with a rotating motion of the rotary shaft through a cam member. An end surface of one of said pistons reciprocates in the compression chamber. The rotary valve includes an introducing passage which allows refrigerant to flow into the compression mechanism through an end opened on an outer surface of the rotary valve. The refrigeration suction mechanism comprises a suction passage and a reactive force transmitting mechanism. The suction passage communicates with the cylinder bore and intermittently communicates with the end of the introducing passage in conjunction with a rotating motion of the rotary valve.

Abstract: In a hybrid compressor, a compression mechanism includes a rotary shaft, which has a first end and a second end. The first end of the rotary shaft is coupled to a rotating body, which receives power from an external drive source. The second end of the rotary shaft is coupled to an electric motor, which drives the rotary shaft. The rotary shaft is coupled to a rotor of the electric motor via a one-way clutch, which prevents power from being transmitted from the rotary shaft to the rotor. The rotor is supported by a motor shaft, which is separate from the rotary shaft. The second end of the rotary shaft is coupled to an end of the motor shaft using the one-way clutch as a coupling.

Abstract: A displacement control mechanism controls displacement of a variable displacement type compressor that forms a refrigerant circulation circuit for an air conditioning apparatus. The displacement is decreased as a pressure in a crank chamber rises while being increased as the pressure in the crank chamber falls. The displacement control mechanism includes a bleed passage, a supply passage, a first control valve and a second control valve. The second control valve includes a back pressure chamber, a valve chamber, a valve body, a spring and a second valve portion. The second valve portion is provided with the back surface of the valve body. The second valve portion closes an opening of an introduction passage in the back pressure chamber when the first valve portion maximizes the opening of the bleed passage.

Abstract: A torque receiving member is fixed to a rotary shaft of a compressor. A pulley, which is rotated by an external drive source, is rotatably supported by a housing of the compressor. The pulley is substantially coaxial with the torque receiving member. A rubber damper is located between the pulley and the torque receiving member. The rubber damper absorbs rotational vibration transmitted from the torque receiving member to the pulley. The pulley has a dynamic damper. The dynamic damper includes rollers, which swing like pendulums to reduce rotational vibration of the pulley. Stress produced due to displacement between the axis of the pulley and the torque receiving member is reduced by the rubber damper.

Abstract: A piston type compressor includes a suction valve mechanism. The suction valve mechanism includes a rotary valve coupled to a rotary shaft. A valve timing adjusting apparatus is capable of changing a relative rotational phase, which is a rotational phase of the rotary valve relative to the rotary shaft. Therefore, the compressor is capable of adjusting the valve timing of the rotary valve and has a reduced size in the axial direction.

Abstract: A compressor component incorporated into a compressor having a compressor body and a compressor pulley mechanism transmitting a driving force to the compressor body has an austenite grain with a grain size number falling within a range exceeding 10, a fracture stress value of at least 2650 MPa, or a hydrogen content of at most 0.5 ppm. This provides a compressor component and a compressor bearing with a long fatigue life, a high anti-crack strength, and a reduced secular dimensional variation.

Abstract: The invention relates to a hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (6) such as to define cylinders (26) with the front ends thereof. According to the invention, the risk of piston seizure can be reduced, whereby the sleeves (28) comprise an axially-defined recess (41) in the outer surface thereof, in the region facing away from the cylinder and the region with the greatest piston radial force, pressing the pistons (29) against the wall of the piston bore.

Abstract: A gasket is provided between a cylinder block and a valve plate. By providing a through hole at a position near the center of the gasket, bending moment acting on the cylinder block is reduced, and hence deformation of the cylinder block is restrained. As a result, reciprocating motion of a piston and rotational motion of a rotary valve are performed smoothly.

Abstract: A swash plate for a swash plate-type, variable displacement compressor, such that the compressor is driven by a drive shaft having a shaft axis. The swash plate includes a boss that is penetrated slidably by the drive shaft. The boss is connected slidably to a rotor that is fixed to the drive shaft, whereby a variable, oblique angle is formed between a surface of the swash plate and the shaft axis. The boss is connected securely within the swash plate and comprises a nitrided surface layer.

Abstract: A by-pass device in a variable displacement compressor has a by-pass passage, a valve body and a deformable separator. The by-pass passage interconnects a discharge pressure region with a crank chamber for releasing refrigerant from the discharge pressure region to the crank chamber. The valve body is arranged in the by-pass passage for opening and closing the by-pass passage. The deformable separator separates a back pressure region from the by-pass passage without sliding. The valve body is urged from a side of an opened position where the valve body is spaced from a valve seat toward a side of a closed position where the valve body contacts with the valve seat by pressure applied from the back pressure region to the separator. The valve body is moved from the closed position to the opened position by deforming the deformable separator.

Abstract: A rotary valve for switching supply passages, and discharge passages of high-temperature and high-pressure steam for a rotor rotatably supported at a casing is constructed by making a fixed side valve plate and a movable side valve plate abut to each other on a slide surface. A pressure chamber into which the high-temperature and high-pressure steam is introduced from the supply passage is opened to a mating surface of a valve body portion with the fixed side valve plate. The fixed side valve plate supported to float is pressed against the movable side valve plate with a pressing load generating in the pressure chamber to bring it into close contact with the slide surface. Leakage of the high-temperature and high-pressure steam from the pressure chamber is prevented by placing a V-packing inside the pressure chamber.

Abstract: The invention relates to a subassembly, consisting of a drive shaft (12), a housing (10) with a through-bore (19), through which the drive shaft projects out of the housing and an axial mechanical seal consisting of a rotating seal ring (22) and a counter-ring (20) which forms a seal between the drive shaft (12) and housing (10) components. The invention aims to improve the assembly of the axial mechanical seal and the thermal dissipation from said mechanical seal. To this end, the counter-ring (20) is configured as one single piece with one of the two components (10, 12). This obviates a separate assembly of the counter-ring and allows the heat produced by friction to be dissipated directly into one of the two components.

Abstract: A piston pump assembly with a rotatingly driven swashplate in driving relationship with a rocker arm and piston engaged with one end of the rocker arm. A spring urges the rocker arm and piston into contact with an annular ring carried by a bearing in the swashplate. The spring may be a separate leaf spring or may be formed integrally with the rocker arm. The rocker arm engagement with the piston uses a spherical ball-joint-like surface. The contact between each of the rocker arm and piston and the annular ring utilize spherical surfaces on the rocker arm and piston, with an elongated footprint on the rocker arm and a circular footprint on the piston. The piston is allowed a slight radial play in operation.

Abstract: A compressor is disclosed generally comprising a cylinder block at least partially enclosing a compression chamber, a swash plate housing mounted adjacent the cylinder block, the swash plate housing at least partially enclosing a swash plate chamber, an inlet port in the swash plate housing, and a passageway connecting the swash plate chamber and compression chamber. In certain embodiments, the passageway comprises a fluid channel in the cylinder block. In some embodiments, at least one bearing is disposed in the swash plate chamber such that air entering through the inlet port flows over the bearing before flowing to the compression chamber.

Abstract: In a seal mechanism which constitutes a port switching portion in a pump mechanism of a paste ejection apparatus that ejects paste, and which prevents leakage of the paste from a seal portion between a plunger block rotating with a plunger and a fixed seal block (between a seal surface and a sliding surface), a housing portion is formed by opposing an outer surface provided for the seal block to an inner surface extending axially from the cylinder block, and a ring-shaped external seal member formed by combination of an O-ring and self-lubricant material such as PTFE is attached into the housing portion. Hereby, it is possible to prevent the paste that has leaked from the seal portion from leaking to the outside of the housing portion by the external seal member.

Abstract: A swash plate compressor comprises a swash plate rotated by a drive shaft and a piston that reciprocates in a cylinder bore by the rotation of the swash plate. The piston includes a tail and a pair of shoes retained in the tail. The shoes sandwich an outer periphery of the swash plate. Each shoe has a receiving face for receiving the outer periphery of the swash plate. A central point of the receiving face is located off a common plane including an axis of the piston and that of the drive shaft.

Abstract: An expander includes a rotor rotatably supported by a casing, a group of axial pistons and cylinders installed so that its axis is surrounded by the rotor, and a swash plate having a rotating surface inclined with respect to the axis of the rotor and is rotatably supported by the casing. The relative rotation of the swash plate and the rotor around the axis is restricted and the relative shifting of the swash plate and rotor in the direction of the axis is allowed, by fitting a slider, fixed to the swash plate by a synchro-pin, into a long hole of an output shaft. Therefore, it is possible to prevent wrenching between the swash plate and the rotor due to thermal expansion while reducing the bending moment acting on the pistons of the group of axial pistons and cylinders of the expander.

Abstract: A double-headed piston type compressor forms a first compression chamber and a second compression chamber for compressing gas. The compressor has rotary shaft having an inner chamber that interconnects a suction chamber and the first and second compression chambers for introducing the gas into the first and second compression chambers. The compressor also has a partition wall that is located in the inner chamber for dividing the inner chamber into a first passage and a second passage. The first passage interconnects the suction chamber and the first compression chamber. The second passage interconnects the suction chamber and the second compression chamber.

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 compressor, in particular for air conditioning systems in motor vehicles, having a housing, a housing sealing cover, a drive shaft with bearings and a drive device for pistons that are displaced back and forth. The drive device transfers the rotational displacement of the drive shaft into the back-and-forth displacement of the pistons. The compressor also includes a cylinder block, in which the pistons that are displaced back and forth take in and compress coolant, a valve device, in addition to a valve plate with intake and discharge valves comprising intake and discharge chambers for an intake pressure zone and a discharge pressure zone. A cylinder head may be a separate element from the housing, in pot-shaped form, or the housing sealing cover. The intake and discharge chambers, the valve device, and the cylinder block may be situated in the closed side of the pot-shaped housing.

Abstract: An axial piston engine (1), including a housing (2) in whose inner compartment (4) a cylinder drum (17) and a swash plate (26) located axially adjacent thereto are situated. Several piston bores (21), which extend approximately parallel to the central axis of the cylinder drum (17) are located in the same, pistons (23) being displaceably guided in the piston bores. The ends of the pistons facing towards the swash plate (26) are supported on the swash plate (26). A driving shaft (7) is rotatably mounted in the housing (2) and is connected to the cylinder drum in a fixed manner secured against rotation therebetween by a multitooth coupling (19) comprising teeth (43a, 44a) and tooth spaces (43b, 44b) which alternate regularly in a peripheral direction and which engage with each other.

Abstract: A compressor includes a housing that has cylinder bores. A swash plate chamber communicates to the cylinder bores and a motor chamber partitioned from the swash plate chamber. A motor is disposed in the motor chamber actuates a drive mechanism in the swash plate chamber so as to move pistons in the cylinder bores. The refrigerant gas is supplied to an interior refrigerant passage of the compressor from an external refrigerant circuit. The swash plate chamber and the motor chamber are separated in the air tight manner. The motor chamber is connected to the interior refrigerant passage by a refrigerant path.

Abstract: A method of assembling 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: A piston type compressor has introducing passages, each extending from one of compression chambers, and a cylindrical rotary valve located between a suction pressure zone and the introducing passages. An opening of each of the introducing passages has an advanced area a part of that is inclined relative to an axial direction and a circumferential direction of the rotary valve. The rotary valve has a residual gas bypass passage. The residual gas bypass passage connects a high pressure introducing passage through the introducing passages, which communicates with the high pressure compression chamber after the discharge stroke ends, to a low pressure introducing passage, which communicates with the low pressure compression chamber.

Abstract: In a piston type compressor, a housing includes a cylinder head which defines a discharge chamber and a cooling chamber. The cooling chamber located adjacent to the discharge chamber surrounds the discharge chamber. The housing also defines a suction chamber, a compression chamber, and a crank chamber. The cooling chamber is isolated from the suction chamber. Gas is introduced from outside of the housing into the suction chamber. A rotary shaft is rotatably supported in the housing. The cam is accommodated in the crank chamber. A piston is operatively coupled to the rotary shaft through the cam. Rotation of the rotary shaft is converted to reciprocation of the piston. A seal member shuts communication between the cooling chamber and an atmosphere outside the compressor to seal an inside of the cylinder head. An introducing passage interconnects the cooling chamber and the crank chamber.

Abstract: A compressor includes a housing for accommodating a compression mechanism, and an oil separator including a cylindrical body having inner and outer cylinders defining therebetween an annular oil separating chamber and fixed in a communication passage of the housing. The outer cylinder is spaced from a communication passage-forming portion of the housing to define a gap therebetween, extends along a slit formed in the communication passage-forming portion of the housing, and is formed with an opening directed tangential to the oil separating chamber and facing part of the slit. Gas discharged from the compression mechanism flows through the slit and the opening into the oil separating chamber to form a swirl flow, so that lubricating oil is centrifugally separated from the gas. Part of the gas collies with an outer face of the outer cylinder, whereby lubricating oil is separated from the gas.

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: An automotive air conditioning compressor with a capacity control valve improves oil retention in the crankcase with a crankcase to suction chamber passage that is formed through the central shaft. The passage inlet opening in the shaft is located within a central chamber inset into the cylinder block, and is thereby sheltered from the main chamber of the crankcase, although still open to the crankcase. So sheltering the inlet of the shaft passage between crankcase and suction chamber isolates the inlet from the greater turbulence and higher velocity gradients within main chamber of the crankcase. Less oil is thus forced through the passage and back out of the crankcase.

Abstract: A supply passage is formed in a rotary shaft along the axis thereof. An expansion passage is formed in the rotary shaft in such a way as to be led to the supply passage. A pair of fluid passages are formed in the rotary shaft in such a way as to communicate with the expansion passage. The fluid passages extend in a direction orthogonal to the axis and the outlet ports of the fluid passages are open to the outer surface of the rotary shaft. The fluid passages extend from the expansion passage to a control pressure chamber, penetrating through the rotary shaft.

Abstract: An oscillating swash plate for an axial piston pump, comprising a rotating disk-like body with an annular seat inclined with respect to the rotation axis of the disk-like body and on which can be accommodated sliding elements for the heads of the axial pistons, a toothed circumferential portion monolithic with the body that is coaxial to the rotation axis and can be coupled kinematically to a gear of the pump, the pump being functionally connected to a motor.

Abstract: A reciprocating piston compressor having a suction muffler and a pair of discharge mufflers to attenuate noise created by the primary pumping frequency in the primary pumping pulse. The suction muffler is disposed along a suction tube extending between the motor cap and the cylinder head of the compressor. The discharge mufflers are positioned in series within the compressor to receive discharge gases from the compression mechanism and are spaced one quarter of a wavelength from each other so as to sequentially diminish the problematic or noisy frequencies created during compressor operation. The motor/compressor assembly including the motor and compression mechanism is mounted to the interior surface of the compressor housing by spring mounts. These mounted are secured to the housing to define the position of the nodes and anti-nodes of the frequency created in the housing to reduce noise produced by natural frequencies during compressor operation.

Abstract: An energy exchanger device can be used for exchanging pressure energy from one fluid to another, or may act as a hydraulic compressor or fluid driven pump. A preferred device uses a jet nozzle to rotate a cylindrical rotor block having a number of axially oriented conduits within it. As the rotor turns, one end of each of the conduits is alternately connected, through a first set of ports, to either an inlet for a high pressure fluid, or an outlet for the high pressure fluid from which the energy has been extracted. Correspondingly, the other end of each of the conduits is alternately connected to either an inlet for a low pressure fluid or an outlet for the fluid to which the energy has been transferred. A freely sliding element, such as a ball, may be placed in each of the conduits to isolate the two fluids from each other.

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.