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

Abstract: A speed pick-up ring includes a main body having a plurality of targets and defining a plurality of notches. Each notch is disposed between adjacent targets. Each notch includes a base wall, a first sidewall and an oppositely disposed second sidewall. The base wall includes a convex portion. A fluid device includes a housing and a variable reluctance speed sensor engaged to the housing. The fluid device further includes a speed pick-up ring disposed within the housing. The speed pick-up ring includes a main body having a plurality of targets and defining a plurality of notches. Each notch is disposed between adjacent targets. Each notch includes a base wall, a first sidewall that is generally concave and an oppositely disposed second sidewall that is generally concave. The base wall includes a convex portion.

Abstract: A pressure regulating restriction for allowing a cylinder bore and a valve plate discharge port to communicate with each other before the cylinder bore communicates with the valve plate discharge port, and an oil passage for allowing the valve plate discharge port and the cylinder bore to temporarily communicate with each other in a time period after the cylinder bore is freed from the communication with the valve plate suction port until the cylinder bore communicates with the pressure regulating restriction. The oil passage has length capable of transmitting high pressure in the oil passage on a side of the cylinder bore at the time of the communication and of restoring the pressure in the oil passage on the side of the cylinder bore to the pressure on a side of the valve plate discharge port before the communication with a next cylinder bore at the time of non-communication.

Abstract: A compressor is provided. The compressor includes a housing, a valve plate, a cylinder block, piston units, a cam element, a driving shaft and a motor. The valve plate is fixed to one end of the housing. The cylinder block is rotatable relative to the valve plate and has cylinder bores disposed in a circumferential direction. A portion of the cylinder block is received in the valve plate. The piston units are disposed the cylinder bores. The cam element is fixed to the housing and is in contact with one end of the piston unit. The cam element has an inclined cam surface. One end of the driving shaft is coupled to the cylinder block. The motor is fixed to an opposite end of the housing, while a rotating shaft is coupled to an opposite end of the driving shaft.

Abstract: A first swash plate (30) and a second swash plate (40) are disposed on either side of a cylinder block (4), and a plurality of cylinders (6) are disposed in the cylinder block (4). A first piston (8) and a second piston (9) are inserted opposite to each other in each cylinder (6) such that the first piston (8) slides on the first swash plate (30) and the second piston (9) slides on the second swash plate (40). By providing a servo mechanism (33) that tilts the first swash plate (30) and a tilt linking mechanism (40, 70) that tilts the second swash plate (40) in conjunction with the tilting of the first swash plate (30), tilt angles of the two swash plates (30, 40) can be controlled by the single servo mechanism (33).

Abstract: The present invention relates to a downhole hydraulic pump for providing fluid pressure during downhole operations, comprising a pump housing, a cam shaft rotatably arranged in the pump housing and having a longitudinal spin axis, the cam shaft comprising a shaft and a cam lobe arranged on the shaft, a radially arranged piston having a housing end and a cam end, a piston housing arranged in the pump housing, an inlet valve arranged in an inlet in the piston housing, an outlet valve arranged in an outlet in the piston housing, and a piston spring arranged in the pump housing for moving the piston away from the piston housing, wherein the piston housing is rotatably connected to the pump housing enabling rotation of the piston housing around a piston housing rotation axis parallel to the longitudinal spin axis of the cam shaft.

Abstract: The variable displacement compressor has a suction-pressure region, a discharge-pressure region and a crank chamber. The compressor includes a supply passage, a bleed passage and a control valve that adjusts cross-sectional area of the bleed passage. The control valve includes a valve chamber, a valve portion and a valve seat member. The valve portion is disposed in the valve chamber for dividing the valve chamber into a bleed chamber, a backpressure chamber and a communication passage. The bleed chamber forms a part of the bleed passage. The backpressure chamber communicates with the supply passage. The communication passage is formed between an outer circumferential surface of the valve portion and an inner circumferential surface of the valve chamber for providing fluid communication between the bleed chamber and the backpressure chamber. The valve seat member is disposed in the bleed chamber and provided separately from a compressor housing forming the valve chamber.

Abstract: A fuel pump assembly for a fuel injection system comprises a drive shaft, at least two pump heads each of which is axially displaced along the drive shaft, each pump head having a respective plunger for pressurising fuel within a respective pump chamber, and at least two cams provided on the drive shaft, each of which is associated with a respective one of the pump heads. Adjacent pump heads are offset angularly from one another by an amount sufficient to allow a region of overlap, in an axial direction along the drive shaft, between the adjacent pump heads.

Abstract: A quintuplex mud pump includes a pair of motors (18), a crankshaft (40) supporting five eccentric lobes (44), and first and second bull gears (30). Each of two pinion shafts (20) are rotationally independent, and has a pinion gear interfacing with a respective bull gear on the crankshaft (40). Five connecting rods (46) interconnect a respective eccentric lobe and a respective piston.

Abstract: A hydraulic pump includes a housing (12), a cylinder block (14), a plurality of pistons (16), a swash plate (18), a trunnion arm (22), a first biasing assembly (54), and a second biasing assembly (56). The cylinder block includes a plurality of piston chambers. The swash plate is disposed for pivotal movement in the housing and cooperates with the pistons to vary the working volume of the piston chambers. The swash plate is pivotal about a pivot axis (80). The trunnion arm includes a cylindrical shaft portion (140) and a cam portion (142) connected with or integrally formed with the shaft portion. The trunnion arm is operatively connected with the swash plate for controlling pivotal movement of the swash plate. The cylindrical shaft portion defines a trunnion arm rotational axis (144) that is parallel to and offset from the pivot axis (80).

Abstract: A diaphragm pump is provided that features a valve housing configured with inlet openings and outlet openings; inlet duckbill check valve assemblies, each configured to be arranged in a respective inlet opening; and outlet duckbill check valve assemblies, each configured to be arranged in a respective outlet opening; each duckbill check valve assembly comprising: a duckbill check valve seat configured with an end having a slit to open to provide the fluid and particulate, and to close to prevent the backflow of the fluid and particulate; and a duckbill check valve support having a base portion configured to be inserted inside the duckbill check valve seat, and having a W-shaped portion configured with an opening to pass the fluid and particulate through the duckbill check valve support to the duckbill check valve seat and also configured to provide support for walls of the duckbill check valve seat in response to back pressure caused by the fluid and particulate.

Abstract: A compressor includes a cylinder block including cylinder bores and pistons within the cylinder bores. A front housing opposes a first cylinder block end face to form a crank chamber accommodating a piston driving mechanism. A valve plate opposes a second cylinder block end face and includes suction and discharge holes. A rear housing includes suction and discharge chambers and opposes the second cylinder block end face with the valve plate there between. Strap-shaped suction valves on the valve plate end face oppose the cylinder block, thereby opening and closing the suction holes at tip portions. Discharge valves on the valve plate end face oppose the rear housing to open and close the discharge holes. Through-bolts join the front housing, the crank chamber, the cylinder block, the valve plate, and the rear housing. The valve plate includes grooves extending from holes accommodating the through-bolts to portions abutting the suction valves.

Abstract: A compressor is provided with a cylinder block including a cylinder bore, a housing coupled to the end of the cylinder block, and a discharge valve held between the cylinder block and the housing. An end of the cylinder block includes a partition that closes one end of the cylinder bore. The partition includes a bottom portion forming a bottom surface of the cylinder bore. The housing includes an outer wall and an inner wall. The outer wall includes two partition supports that are in contact with parts of the bottom portion. The two partition supports are arranged on opposite sides of the discharge valve and extend toward the inner wall.

Abstract: A fluid end 15 for a multiple reciprocating pump assembly 12 comprises at least three plunger bores 61 or 91, each for receiving a reciprocating plunger 35. Each plunger bore has a plunger bore axis 65 or 95. The plunger bores are arranged across the fluid end to define a central plunger bore with lateral plunger bores located on either side. The fluid end 15 also comprises at least three respective suction valve bores 59 or 89 in fluid communication with the plunger bores. Each suction valve bore can receive a suction valve 41 and has a suction valve bore axis 63 or 93. The fluid end 15 also comprises at least three respective discharge valve bores 57 or 87 that can receive a discharge valve 43 and are in fluid communication with the plunger bores. Axes of suction and discharge valve bores are offset in the fluid.

Abstract: The present disclosure sets forth an axial piston pump with greatly improved throughput. The axial piston pump provides cylinders, antechambers, and fluid flow apertures which are uniquely shaped and dimensioned so as to increase the overall flowability and expulsion rate of the piston pump. By providing curvilinear transition zones and fluid flow apertures, the cylinders can be completely filled and pressurized even at the extremely high pressures and RPMs required by modern machines. Such machines may include front-end loaders, excavators, pipe layers, graders, and the like wherein such pumps can be used to power hydraulic cylinders moving the implements, work arms and other tools associated with such machines.

Abstract: A wabble plate type variable displacement compressor has a wabble plate rotation preventing mechanism including an inner ring axially movable relative to a main shaft, an outer ring connected to the wobble plate, a plurality of balls placed between guide grooves of the inner and outer rings and performing power transmission, and a sleeve axially movably engaged with the inner ring, provided so as to be axially movable together with the inner ring. A shape differs between the axial cross-sectional profiles of substantially concave spherical surfaces formed respectively in the inner periphery of the outer ring and the outer periphery of the sleeve such that the closer to the axial opposite ends of the contact portion between both the surfaces the position is, the greater the clearance between these surfaces. Implementation of the wabble plate rotation preventing mechanism in such a compressor can provide excellent durability and silent performance.

Abstract: A fluid end (15) for a multiple reciprocating pump assembly (12) comprises at least three plunger bores (61 or 91) each for receiving a reciprocating plunger (35), each plunger bore having a plunger bore axis (65 or 95). Plunger bores being arranged across the fluid head to define a central plunger bore and lateral plunger bores located on either side of the central plunger bore. Fluid end (15) has suction valve bores (59 or 89), each suction valve bore receiving a suction valve (41) and having a suction valve bore axis (63 or 93). Discharge valve bores (57 or 87), each discharge valve bore receiving a discharge valve (43) and having a discharge valve bore axis (63 or 93). The axes of at least one of suction and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.

Abstract: A fluid end (15) for a multiple reciprocating pump assembly (12) comprises at least three plunger bores (61 or 91) each for receiving a reciprocating plunger (35), each plunger bore having a plunger bore axis (65 or 95). Plunger bores being arranged across the fluid head to define a central plunger bore and lateral plunger bores located on either side of the central plunger bore. Fluid end (15) has suction valve bores (59 or 89), each suction valve bore receiving a suction valve (41) and having a suction valve bore axis (63 or 93). Discharge valve bores (57 or 87), each discharge valve bore receiving a discharge valve (43) and having a discharge valve bore axis (63 or 93). The axes of at least one of suction (10) and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.

Abstract: The present disclosure sets forth an axial piston pump barrel. The axial piston pump barrel is provided with cylinders, antechambers, and fluid flow apertures which are uniquely shaped and dimensioned so as to increase the overall flowability and expulsion rate of a piston pump. By providing curvilinear transition zones and fluid flow apertures, the cylinders can be completely filled and pressurized even at the extremely high pressures and RPMs required by modem machines. Such machines may include front-end loaders, excavators, pipe layers, graders, and the like wherein such pumps can be used to power hydraulic cylinders moving the implements, work arms and other tools associated with such machines.

Abstract: A fluid device includes a variable swashplate adapted for movement between a first position and a second position. A control piston is adapted to selectively move the variable swashplate between the first and second positions. A control valve is in fluid communication with the control piston. The control valve includes a sleeve defining a spool bore, at least one fluid inlet passage in fluid communication with a fluid source and at least one control passage in fluid communication with the control piston. The control fluid passage includes an opening at the spool bore. A spool is disposed in the spool bore of the sleeve. The spool includes a metering surface that selectively communicates fluid between the fluid inlet passage and the control fluid passage. The metering surface has a first end and a second end. The metering surface having a tapered surface disposed between the first and second ends.

Abstract: A compact, integrated hydrostatic transmission without reduction gearing wherein the pump and motor are contained within a single housing, and an output shaft extends from the housing inline with a shaft of the motor. The output shaft is directly connectable to a wheel of a vehicle. The pump and motor share a common sump within the housing in which pump and/or motor leakage is collected.

Abstract: A compressor includes a rotary shaft, a cam, a cylinder block, pistons, a thrust bearing, a rotary valve, and an oil passage. The rotary shaft has an in-shaft passage formed therein. The cam rotates integrally with the rotary shaft. The pistons are coupled to the rotary shaft through the cam. The thrust bearing is provided between the cam and the cylinder block. The thrust bearing includes a first race in contact with the cam, a second race in contact with the cylinder block, and rolling elements retained between the first and second races to form a gap therebetween. The oil passage extends from the gap to the in-shaft passage and includes an oil retaining space formed in at least one of the cam and the cylinder block.

Abstract: A hydrostatic machine includes a housing and a drive shaft. The housing has an inner housing part, configured to receive a force flow, an outer housing part, configured to seal and damp, and a housing floor. The drive shaft is configured, on an input side, to pass coaxially through the housing floor and is configured, on an output side, to pass coaxially through a swash plate. The drive shaft is connected to a cylinder drum in a rotationally fixed manner. The hydrostatic machine is configured in a weight-saving manner and is configured such that propagation of vibrations in the hydrostatic machine, and noise generation therefrom, are reduced. To this end, the drive shaft is further configured to pass only partially through the inner housing part and is rotatably mounted in the housing floor and the inner housing part.

Abstract: A swash-plate-type compressor of a double-headed-piston configuration, wherein: a front intake chamber is formed set apart from a swash plate chamber so as to be positioned in a narrow space between circumferentially arranged front cylinder bores; and an intake-chamber-communication path is formed in a cylinder block, the intake-chamber-communication path allowing the front intake chamber and a shaft hole to communicate. A front-bore-communication path is formed on the cylinder block, the communication path allowing each of the plurality of front cylinder bores to communicate with the shaft hole. A front rotary valve is provided on a rotating shaft in which a lead-in groove is formed. The lead-in groove allows the intake-chamber communication path and the front-bore communication path to communicate in the stated order, while the lead-in groove rotates integrally with the rotating shaft. In the compact swash-plate-type compressor any decrease in pulsation or intake efficiency is minimized.

Abstract: In a swash-plate type hydrostatic piston engine, a drive unit (10) and a swash plate (17) are received by a pot-shaped housing (1b). According to the invention, the pot-shaped housing (1b) is configured such that it is able to receive drive units (10a, 10b) of at least two rated quantities of a specific product series of the hydrostatic piston engine.

Abstract: A diaphragm pump having an improved wobble plate and cam/bearing assembly for increased pump life and improved inlet and outlet valve design for increased effective sealing area. A cam/bearing assembly includes a cam injection molded directly into an inner race of a bearing to prevent the cam from pulling away from the bearing. The wobble plate is injection molded directly onto an outer race of the bearing to prevent the wobble plate from pulling away from the cam and bearing. Inlet and outlet check valves include rounded peripheral relief zones that form a band, as opposed to a line, of effective sealing area when in the sealed position within a valve seat that eliminate or reduce sealing inconsistencies and increase sealing efficiencies.

Abstract: A compressor includes a compressing mechanism, a discharge chamber, a housing accommodating the compressing mechanism and the discharge chamber, a discharge port communicating with the discharge chamber through a discharge passage and also with an external refrigerant circuit, a muffler formed by an expanded space disposed on the discharge passage, and a check valve disposed on the discharge passage. The pressure loss caused by the discharge passage is less than that in the known compressor. The check valve is disposed in the muffler to open and close an inlet of the muffler, and the muffler is formed by the housing and a cover independent of and connected to the housing.

Abstract: A pump system has a rotatory shaft and a rotatory drive arrangement coupled to the rotatory shaft for applying rotatory energy thereto. First through fourth pump arrangements are coupled to the rotatory shaft, each pump arrangement pumping a pulse of air during each rotation of the rotatory shaft, the first, second, third, and fourth pump arrangements pumping a corresponding pulse of air sequentially during each rotation of the rotatory shaft. The rotatory shaft has a first and second ends, and a central region therebetween where an electric motor is coaxially arranged. The first and third pump arrangements are coupled to the first end of the rotatory shaft, and the second and fourth pump arrangements are coupled to the second end of the rotatory shaft. Angularly displaced eccentric couplers couple the pump arrangements to the respective ends of the rotatory shaft.

Abstract: A compressor includes a rotary shaft, a cam, a cylinder block, pistons, a thrust bearing, a rotary valve, and an oil passage. The rotary shaft has an in-shaft passage formed therein. The cam rotates integrally with the rotary shaft. The pistons are coupled to the rotary shaft through the cam. The thrust bearing is provided between the cam and the cylinder block. The thrust bearing includes a first race in contact with the cam, a second race in contact with the cylinder block, and rolling elements retained between the first and second races to form a gap therebetween. The oil passage extends from the gap to the in-shaft passage and includes an oil retaining space formed in at least one of the cam and the cylinder block.

Abstract: In a cylinder head 104 provided on a head side of a cylinder block 101 with a valve plate 103 interposed therebetween, a suction chamber 119 is formed on the center side and a discharge chamber 120 is formed so as to encircle the suction chamber 119. In the cylinder head 104, an oil storage chamber 132 for storing an oil separated from a discharged refrigerant by an oil separating portion (a separation pipe 130 etc.) is provided. The oil storage chamber 132 extends in the diametric direction of the cylinder head 104 integrally with the cylinder head 104 and has an open end at the outer face of the cylinder head 104, and the open end is occluded by an occluding member 134. Here, the oil storage chamber 132 has a portion bulging into the suction chamber 119.

Abstract: The invention is a hydrogen generator including a pump for pumping a liquid from a reservoir to a reaction area, where the liquid reacts to produce hydrogen gas, and a fuel cell system including the hydrogen generator and a fuel cell stack. The pump is a diaphragm pump with mechanically operated liquid inlet and outlet valves that are opened by cam-operated pushrods, and the pushrods are isolated from the liquid flowpath through the pump by diaphragms. All valves in the liquid flow path between the liquid reservoir and the reaction area are mechanically operated valves.

Abstract: An axial piston pump has: a cylinder body that forms therein a cylinder chamber extending in an axial direction of a drive shaft and rotates integrally with a driven shaft; a piston that reciprocates in the axial direction of the drive shaft; and a cam device that rotates integrally with the drive shaft and has: a fixed cam member that has a cam surface capable of coming into contact with a cam follower coupled to the piston and is capable of rotating integrally with the drive shaft, with movement of the fixed cam member in the axial direction being restricted; and a movable cam member that has a cam surface capable of coming into contact with the cam follower and is capable of rotating integrally with the drive shaft, with movement of the movable cam member in the axial direction being allowed, irregularity differences in the axial direction of the cam surface of the fixed cam member and the movable cam member being different from each other.

Abstract: A rotational shaft 22 receives input of torque that is output from an electric motor 19. A housing 23 rotatably supports the rotational shaft 22. A cylinder block 24 inside the housing 23 rotates with the rotational shaft 22. The pistons 25 are supported relative to the respective cylinder chambers 24a in the cylinder block 24 so as to be slidably displaceable. A swash plate 26 is provided so as to come into contact with ends of the pistons 25 and be rotatable around the rotational shaft 22 with the pistons 25, and be rotatable about a rotation centerline that is obliquely inclined relative to the rotational shaft 22. A case 27 inside the housing 23 is pivotably supported relative to the housing 23. A bearing portion 28 holds the swash plate 26 relative to the case 27 so as to be rotatable around the rotation centerline.

Abstract: A hydraulic actuator unit includes a first electric motor assembly formed by mounting one of a pair of electric motors to one of a pair of electric motor covers, wherein the first electric motor assembly is detachably mounted to a pump case so as to rotate a first control shaft around its axis line, and a second electric motor assembly formed by mounting the other one of the pair of electric motors to the other one of the pair of electric motor covers, wherein the second electric motor assembly is detachably mounted to the pump case so as to rotate a second control shaft around its axis line.

Abstract: According to the present invention, a reciprocating compressor with a rotary valve comprises a cylinder block with plural cylinder bore, a drive shaft which is supported and permitted to rotate in relation to the cylinder block, a piston which is housed in the cylinder bore and allowed to reciprocate therein, a power transmitting unit which connects the piston and drive shaft, a rear housing wherein an intake chamber and exhaust chamber are formed, and a rotary valve which rotates with the drive shaft and is installed in the inner surface of a coupling hole formed in the cylinder block and permitted to slide and rotate therein. In the inner circumference of the cylinder block, connection holes are respectively connected to the cylinder bore. A bypass unit is included between the coupling hole and rotary valve and bypasses the refrigerant remaining in the connection hole of one cylinder bore during the compressive stroke of the piston, then discharges it through the connection hole of another cylinder bore.

Abstract: A pump assembly 10 for high pressure cleaners having a pump body 12 encasing the free end 14 of a motor shaft provided with a keyed-on wobble plate 16 which moves one or more than one axial pistons 18 that are elastically tensioned by helical springs 20. The pump assembly also includes a pump head 32 fixed to the pump body 12 provided with fluid inlet and outlet conduits and relative valves, and an intermediate housing 34 for receiving and guiding the piston 18. The intermediate housing 34 has a frustoconical-shaped body with its larger diametered bottom section facing the same-diametered pump body 12 and being secured thereto by screws 36.

Abstract: A hydraulic power unit having a power shaft that rotates a cam. The cam actuates a piston assembly that contains a plurality of pistons wherein each piston has a piston body and fluid working chamber. An electrically actuated bypass valve is fluidly connected and in communication between an outlet check valve and a fluid working chamber of each piston such that when actuated the electrically actuated bypass valve directs fluid away from the outlet port into a reservoir to be returned to an inlet port.

Abstract: Provided is a variable displacement swash plate type compressor including a cylinder block having a plurality of cylinder bores, a drive shaft rotatably supported by the cylinder block, a lug plate fixedly installed at the drive shaft, a swash plate rotated by the lug plate to vary its inclination angle, and pistons reciprocally accommodated in the cylinder bores depending on rotation of the swash plate, the compressor including a projection projecting from the lug plate toward the swash plate and disposed only behind the rotational direction of the drive shaft, a slope formed on the rear part of the lug plate at one side of the projection, an arm projecting from the swash plate toward the lug plate, a first guide coupled to the arm in front of the rotational direction of the drive shaft to move along the slope in a contact manner, and a second guide coupled to the arm adjacent to the projection to move along the slope in a contact manner.

Abstract: Apparatus for a pump assembly and a fluid metering unit. The pump assembly can include a diaphragm with a portion of a body being molded over a portion of each one of a plurality of pistons. The pump assembly can include a wobble plate, a lower housing, and a spring positioned between the wobble plate and the lower housing. A valve housing can include pumping chambers with side walls that are angled. The fluid metering unit can include a bayonet locking mechanism and/or a seal between a housing and a flow meter. The controller can be calibrated according to the type and/or temperature of the fluid.

Abstract: A reciprocating compressor includes a motor having a motor shaft, four cylinders provided in perpendicular directions relative to an axial direction of the motor shaft, and four pistons Each piston has a piston head part and a rod part formed integrally with the piston head part. Each piston head part is fitted into one of the four cylinders in a reciprocable fashion. Each rod part is rotatably mounted to an eccentric shaft that is fixed to the motor shaft.

Abstract: In a tandem piston pump (1) from which pump discharge pressure from four systems is extracted, a tilt axis direction of a front swash plate (14) and a tilt axis direction of a rear swash plate (54) are different to each other, respective discharge ports (23, 24) of a rear pump (50) are opened at a phase difference relative to respective discharge ports (21, 22) of a front pump (10), and respective pump ports (41, 42) of the front pump (10) and respective pump ports (43, 44) of the rear pump (50) are opened in different side faces (71, 72) of a port block (70).

Abstract: A pumping machine, that can serve a system as the sole main pump for pressurizing a primary liquid flow, incorporates, in a single machine, a rotor-drum type AP (axial piston) pump and a PX (pressure exchanger) that recovers energy from a secondary liquid flow such as the brine discharge from an RO seawater desalination system, with benefits including fewer moving parts and small machine size along with lower capital and operating costs. A single rotor-drum containing the cylinders and pistons is located between two end blocks, one or both configured with manifold passageways, ports and sliding valves. A swash-plate at one end reciprocates the pistons axially when the rotor-drum is rotated.

Abstract: A compressor includes a rotary shaft, a cam, a cylinder block, pistons, a thrust bearing, a rotary valve, and an oil passage. The rotary shaft has an in-shaft passage formed therein. The in-shaft passage has an outlet open to the outer peripheral surface of the rotary shaft. The cam rotates integrally with the rotary shaft. The pistons are coupled to the rotary shaft through the cam. The thrust bearing is provided between the cam and the cylinder block. The thrust bearing includes a first race in contact with the cam, a second race in contact with the cylinder block, and rolling elements retained between the first and second races to form a gap therebetween. The oil passage is formed in the outer peripheral surface of the rotary shaft so as to extend from the gap to the outlet of the in-shaft passage.

Abstract: A swash plate compressor 1 includes a swash plate 3 which rotates around a rotary shaft 2, a piston 4 which moves forward and backward in response to the rotation of the swash plate 3 and in which a hemispherical concave sliding surface 4a is formed, and a shoe 5 in which there are formed a flat end surface portion 12 which comes into sliding contact with the swash plate 3 and a spherical surface portion 11 which comes into sliding contact with the sliding surface 4a of the piston 4. A columnar portion 13 is formed between the spherical surface portion 11 and the end surface portion 12 in the shoe 5, and in a boundary area between the columnar portion 13 and the spherical surface portion 11, there is formed a spherical-surface-portion side flange 14 which protrudes radially outward and constitutes the spherical surface portion. The lubrication of the shoe is satisfactorily performed and the entry of foreign matter into the sliding parts can be prevented.

Abstract: An apparatus is provided and may include a compression mechanism, a valve plate having a plurality of ports, a header, and a plurality of cylinders disposed within the header. A plurality of pistons may be respectively disposed in the plurality of cylinders and may be movable between a first position separated from the valve plate and permitting flow through the plurality of ports and into the compression mechanism and a second position engaging the valve plate and restricting flow through the plurality of ports and into the compression mechanism. A chamber may be disposed within each of the cylinders and may receive a pressurized fluid in a first mode to move the piston into the second position and may vent the pressurized fluid in a second mode to move the piston into the first position. One of the chambers may include a different diameter than the other of the chambers.

Abstract: Water leakage and damage to the electric motor of a diaphragm type pressurized pump are avoided by providing the diaphragm with integral hollow cylinders which are inserted through ladder holes of piston head pushing chunks and deformed into sealing engagement with the pushing chunks and their corresponding wobble plates by screws extending through the cylinders and threadedly engaged within corresponding threaded holes of the wobble plates.

Abstract: A high-pressure fuel pump is comprises of: a plunger which slidably fits to a cylinder and reciprocates for pressurizing and discharging a fuel taken in a pressurizing chamber; an inlet valve device for taking in a fuel into the pressurizing chamber; an outlet valve device for discharging the pressurized fuel from the pressurizing chamber; and a communicating pass which comprises a hole or a groove formed in the cylinder, and communicates between a pressurized fuel area and a gap between the cylinder and the plunger.

Abstract: The present invention is directed to provide a device for reducing pulsation in a variable displacement compressor. The compressor is connected to an external refrigerant circuit. The device for reducing pulsation includes a flow passage and a control valve. The control valve includes a valve housing, a spool valve and a damper chamber. The spool valve has formed therethrough a flow hole. The damper chamber communicates with the flow passage adjacent to the external refrigerant circuit through the flow hole. Effective cross-sectional area and effective length of the flow hole are determined based on frequency of a specific pulsation of the refrigerant gas and volume of the damper chamber at the time of the development of the specific pulsation in such a manner that the specific pulsation is developed, resonance effect of a Helmholtz resonator takes place in the damper chamber.

Abstract: A stroke-adjustable air conditioning compressor, in particular for motor vehicles, including a drive mechanism for pistons that move back and forth, the pistons being driven by an adjusting plate, such as a pivoting plate, pivoting ring or swash plate at an adjustable pivoting angle. The position of the pivoting angle is influenced inter alia by compressive forces, inertial forces and elastic forces that are active in the drive mechanism.

Abstract: Engine-driven hydraulic pump for an aircraft, having a first and a second pump unit which each comprise an adjustable swash plate and a piston assembly coupled with said swash plate and driven by a pump shaft, a control device for adjusting the inclination of the swash plate and a drive shaft via which the hydraulic pump can be driven by an engine of the aircraft while generating hydraulic pressure at an outlet line, characterized in that the pump units are arranged in parallel and have a respective pump shaft, which pump shafts are coupled with the drive shaft by a gear unit.