Abstract: A plunger type water pump mainly comprises a cavity body, a rotary main shaft and a plunger flow-distributing unit. The plunger flow-distributing unit comprises a flat valve assembly, a plunger-shoe assembly and a supporting valve assembly. The plunger-shoe assembly divides the cavity body into a high-pressure cavity and a low-pressure cavity independent of each other. The high-pressure cavity is in fluid communication with the flat valve assembly; and the low-pressure cavity is in fluid communication with the supporting valve assembly. The high-pressure water and the low-pressure water are independent of each other. This arrangement ensures a high volumetric efficiency of the water pump under ultra-high-pressure conditions and provides fluid support and lubrication for a friction coupling under high-speed heavy-load conditions to prolong the service life of the water pump.

Abstract: A swash plate includes a boss, which is mounted on the drive shaft, and a plate portion, which extends from the boss to be inclined with respect to the drive shaft. A rotary valve includes a suction passage, which sequentially connects cylinder bores in a suction stroke via an associated guide passage. An introduction guide communicates with the shaft bore to introduce the refrigerant gas in the swash plate chamber to the rotary valve. The introduction guide faces the boss and extends in the radial direction from the shaft bore beyond the boss. Therefore, suction efficiency of refrigerant gas from the swash plate chamber to the cylinder bore has improved.

Abstract: A pressure pump in a primary liquid flow is combined with a pressure exchanger for energy recovery from a secondary liquid flow. A motor-driven rotor portion, including two (primary and secondary) rotatable drum-type cylinder assemblies, is disposed between end blocks configured with input/output ports and cavities forming sliding synchronous reversing valves. Interconnected piston assemblies, including at least one primary piston and one secondary piston, are reciprocated axially by a central angled swash-plate in a progressive sequential manner by rotation of the rotor portion. The combination machine can be optimized for beneficial deployment in a reverse osmosis seawater desalination system to provide unusual simplicity, high efficiency energy recovery from the brine discharge flow and low overall operating cost.

Abstract: The invention concerns a variable pump or hydraulic motor with a drive shaft with a first axis of rotation and first plungers connected to the drive shaft and rotatable around the first axis of rotation. A port plate mounted in the housing can rotate around an axis intersecting the first axis, for adjusting the stroke volume. The port plate positioning drive comprises two counter-acting hydraulic actuators acting on the port plate in the direction of the first plungers.

Abstract: A rotary reciprocating pump comprises: i) a pump housing having intake and discharge ports; a shaft driven rotary piston carder, rotatably carrying pistons circularly arranged therearound; ii) a driven rotary cylinder block having a plurality of cylinder bores therein, circularly arranged therearound for reception of the pistons, and having a flat outer side portion having an intake/discharge port therethrough communicating with the cylinder bores; iii) a stationary sloping inner control surface portion in sliding proximity with the outer side portion of the rotating cylinder block, the control surface portion configured so that the cylinder block moves outwardly for intake and inwardly for discharge, the control surface portion also having grooved openings therethrough to appropriately communicate with the ports to the bore through the cylinder block and with the intake and discharge ports in the pump housing; and, iv) a spring biasing the cylinder blocks towards the control surface portion.

Abstract: The invention relates to a hydraulic device having, in a housing, a rotor, which can rotate about a first axis, with pistons and chambers on both sides of the rotor, which can rotate about a second axis and are formed by a cylindrical wall and a piston. The cylindrical walls are rotatable about a second axis (m1 and m2) and the first axis, such that, during rotation of the rotor, the volumes of the rotor chambers on one side of the rotor and the rotor chambers on the other side of the rotor alternatively have a minimum value.

Abstract: Disclosed is a compressor in which, in correspondence to a point in time that the piston is reached to a bottom dead center to start compression of the refrigerant, the outlet of the main refrigerant suction channel is closed by an inner wall of the cylinder block so that the inlet of the suction passageway of the cylinder block and the outlet of the main refrigerant suction channel of the drive shaft are discommunicated.

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: 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: The invention concerns a hydraulic device with a housing and a rotor which can rotate in the housing and has fixedly mounted pistons. Around the piston there are drum sleeves which each, together with a piston, form a chamber of variable volume and which are supported by a drum plate with an axis which intersects the axis of the rotor at an angle. Clamping means hold the drum sleeve against the drum plate and the clamping means are designed in such a manner that the drum sleeves can make a movement along the drum plate which is double of the radial movement which occurs in the event of synchronous rotation between the drum plate and a drum sleeve.

Abstract: In certain embodiments, a pump includes a first end section having a fluid inlet and a fluid intake valve, a second end section having a fluid outlet, and a midsection disposed between the first and second end sections, wherein the midsection includes a piston coupled to a drive member. The pump also includes a first set of bolts coupling the first end section to the midsection, and a second set of bolts coupling the second end section to the midsection, wherein the first and second end sections are independently releasable from the midsection via the first and second sets of bolts, respectively.

Abstract: The present invention relates to a compressor, which has a bolt-cooling part formed between a suction chamber and a bolt fastening hole formed at a position, where the suction chamber and a discharge chamber of a housing are partitioned from each other, for allowing for a flow of refrigerant toward the bolt fastening hole to reduce an influence of temperature of discharged refrigerant, thereby preventing loosening of a bolt due to a thermal expansion, and improving 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 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 wave cam type compressor is provided. The compressor has a wave cam body mounted on a rotary shaft for integral rotation and pistons operably contacting said cam body by way of shoes. The shoes are moveable relative to the cam body according to the rotation of the cam body. The shoes move on predetermined paths on cam surfaces of the cam body. The rotation therewith of the rotary shaft is converted into a reciprocation movement of the pistons between top dead center and a lower dead center in cylinder bores to compress fluid supplied into the cylinder bores. Each cam surface has a contour matching the locus of a predetermined smooth two-dimensional imaginary curve when the curve is translated from its plane in the direction perpendicular to the plane. A first portion is provided on the cam surface to drive the piston to the bottom dead center and a second portion is provided on the cam surface to drive the piston to the top dead center.

Abstract: A pump apparatus includes an outer cylindrical housing having end plates, and a power conversion assembly supported for rotation within the outer housing. A torque input shaft provided on one of the end plates has a "primary" gear on its free end. The inner housing includes a crank case within which cylinders are arranged at spaced radial locations. Double-acting pistons are housed within the cylinders. Crank members supported by the crank case for rotation are coupled to the pistons via force transmitting elements to drive the pistons with reciprocating motion in the cylinders. Each of the crank members includes a "secondary" gear engaged with the primary gear. Each crank member includes a linkage coupled with a piston rod so that the pistons are driven in reciprocating motion in the cylinders.

Abstract: A low-pollution external combustion piston engine is adapted to utilize any of a number of expansible gases and fuels, and to maximize power output relative to the weight of the engine. The engine has a highly efficient and compact rotary design featuring a multi-cylinder rotary block acting on a rotary torque conversion plate. The design includes porting and valving for controllably admitting pressurized gas at substantially equal pressures to both sides of each piston to drive each piston bidirectionally and thereby maximize power output and efficiency. Each piston chamber has both primary and secondary exhaust porting to minimize back pressure and thereby further aid power output and efficiency.

Abstract: A compressor has a swash plate supported on a drive shaft for an integral rotation. The swash plate is coupled to a plurality of pistons reciprocally moveable in a cylinder block to compress gas therein. Reaction force of the compressed gas applied to the piston and causing axial load acting on the swash plate and the drive shaft is buffered by buffer structure. The buffer structure comprises a first bearing interposed between a first surface of the swash plate and the cylinder block. The buffer structure has a second bearing interposed between a second surface of the swash plate and the cylinder block. One of the bearings is arranged to be flexibly deformable to absorb the axial load while the other bearing is arranged to be rigid to receive the axial load and transmit the axial load to the cylinder block.

Abstract: A swash plate type compressor is disclosed. A swash plate mounted on a rotary shaft reciprocally drives a double headed piston in cylinder bores. The rotary shaft is supported by valve plates, via a pair of tapered roller bearings. Outer races of the bearings are slidably fitted into sleeves, respectively. A disc spring disposed between protrusions for holding a front housing and the outer race is resiliently deformed for applying a preload to the rotary shaft. Protrusions for holding a rear housing abut against the outer race. Cylinder blocks, valve plates and housings are tightly connected one to another by a plurality of through bolts.

Abstract: A swash-plate type compressor comprising a cylinder block, front and rear valve plates, and front and rear housings attached to either end of the cylinder block over the valve plates. A swash-plate is accommodated in the cylinder block to reciprocally move a plurality of double headed pistons which form compression chambers on either side thereof. A drive shaft carries the swash-plate and is supported by a pair of tapered roller bearings. Each of the tapered roller bearings is secured in the central hole of each valve plate. Also, each valve plate is coupled to the cylinder block in a locating projection-locating hole fitting relationship to effect centering the drive shaft relative to the cylinder block. In addition, a suction passage is arranged to introduce the refrigerating gas from the swash-plate chamber to each of the compression chambers in such a manner as to reduce the radius of the cylinder block.

Abstract: A refrigerant gas suction valve mechanism for a reciprocating piston type compressor is disclosed. The mechanism has a drive shaft rotatably disposed in a gas receiving chamber where uncompressed gas is introduced, Double- headed pistons provided in cylinder bores compress the gas when the pistons move from the bottom dead center to the top dead center. A suction port selectively permits and blocks communication between the suction passage and the compression chambers. A resilient member holds a rotary valve in contact with an inner wall of a recessed chamber with predetermined force. The suction port is maintained at a predetermined distance from a point where the pistons reach the top dead center so that the suction port is closed by the pistons before the pistons reach the top dead center.

Abstract: A swash plate type compressor is provided with a plurality of cylinders and a front and rear cylinder blocks having a crank case connected to a suction port. The cylinder blocks are connected to a front and rear housing sections in order to cover the cylinders. Each housing section contains a discharge chamber. A drive shaft is rotatable supported by the cylinder blocks. One end of the drive shaft is sealed within the front housing. A swash plate is mounted on the drive shaft and is rotatably disposed within the crank case. A plurality of two-head pistons engage the swash plate via a pair of shoes. The pistons move within their respective cylinders in cooperation with the swash plate. The refrigerant is sucked into each cylinder via a suction passage, and is then compressed therein. The refrigerant is discharged into the external refrigerating circuit through the front and rear discharge chambers, .and the front and rear discharge ports.

Abstract: A swash plate type compressor which includes a pair of cylinder blocks. The cylinder blocks contains a crank case and a plurality of cylinders leading to a suction port. A pair of housing sections cover the cylinder blocks, and contain a suction chamber leading to each about the center of the cylinders, and a discharge chamber which is fluidly connected to the cylinders. The cylinder blocks rotatably support a drive shaft. The suction chamber contains a shaft sealing device in order to seal a forward section of the drive shaft. A refrigerant fluid within the crank case is sucked into the cylinders via the suction chamber. A refrigerant passage is provided along the central axis of the drive shaft. A plurality of inlet and outlet ports are connected to the refrigerant passage and to the crank case and suction chamber. The refrigerant passage, the outlet ports and the inlet ports form a refrigerant suction passage.

Abstract: A swash plate type compressor is provided with a front and rear cylinder blocks having a crank case connected to a suction port. The cylinder blocks include a plurality of cylinders, and are connected to a front and rear housing sections for covering the cylinders. Each housing section contains a discharge chamber. A drive shaft is rotatabley supported by the cylinder blocks. A swash plate is mounted on the drive shaft and is rotatably disposed within the crank case. Two-head pistons move within their respective cylinders in cooperation with the swash plate. The refrigerant is drawn into, and compressed in each cylinder. Thereafter, it is discharged into the external refrigerating circuit through the front and rear discharge chambers, and a final discharge port. A discharge passage includes a hollow primary passage which is provided within the drive shaft. The primary passage communicates with the front and rear discharge chambers. A groove is provided on an inner wall of the primary passage.

Abstract: A swash plate type compressor comprising a swash plate accommodated in a swash plate chamber. Front and rear housings are attached to the cylinder block to form suction chambers and discharge chambers, respectively. A refrigerating medium is introduced from a suction inlet to the suction chambers via the swash plate chamber and discharged from the discharge chambers. A drive shaft is fixed to the swash plate for reciprocally moving pistons. The drive shaft has a discharge passage in the form of an axial bore formed in the drive shaft for connecting the front discharge chamber to the rear discharge chamber. The discharge passage is thus isolated from the suction system.

Abstract: A piston-operated machine is disclosed having a crank shaft and an intermediate crank section, the axis of the crank section being oblique to the axis of the crank shaft. The crank section passes rotatably and centrally through a wobble plate, and the center of the wobble plate lying on a prolongation of the axis of the crank shaft. A plurality of cylinders are provided having axes parallel to and equally spaced from the axis of the crank shaft. A piston in each cylinder is mounted on a piston rod extending coaxially from the cylinder to a respective connection on the wobble plate spaced from the center of the wobble plate. Each piston rod is rotatably but non-slidably engaged in a thrust member eccentrically rotatable in a thrust plate mounted to rotate about the same axis as the wobble plate.

Abstract: An anti-rolling structure for a double headed piston of a disc cam type reciprocative compressor, comprising a cylinder block (1) through which a plurality of pairs of front and rear cylinder bores (4) are provided in parallel to a drive shaft (3) rotatably secured in the center of the cylinder block (1), and a double headed piston (8) slidably inserted in the respective pair of cylinder bores (4) for reciprocation in the longitudinal direction. A disc cam (13) having opposite sinuous surfaces (13') and rotatably accommodated within a cam chamber (5) is fixedly secured to the drive shaft (3), and a pair of front and rear cam rollers (14F, 14R) are arranged between the disc cam (13) and the piston (8) in a slidable and rotatable manner so as to nip the disc cam (13) between both cam rollers (14F, 14R) to transmit the rotation of the disc cam (13) to the piston (8) as a reciprocation in the longitudinal direction thereof.

Abstract: A pressure intensifier for a fluid comprises at least three piston assemblies disposed along mutually parallel axes equiangularly disposed with respect to a central axis of the intensifier and radially equidistant therefrom. Each piston assembly has two opposed high pressure cylinders and low pressure cylinders. Fluid is supplied to the low pressure cylinders and discharged through a low pressure valve operatively coupled by a swash plate to the pistons of each assembly so as to be driven thereby. A high pressure collector, optionally in the form of a closed circuit, is provided for receiving high pressure fluid from the high pressure cylinders.

Abstract: A single acting steam engine wherein means are provided for auxiliary exhaust through the piston when an auxiliary exhaust poppet valve is open and the auxiliary exchange passages of the piston register with exhaust ports in the cylinder wall. The opening and closing of the auxiliary exhaust poppet valve are responsive to the rate of reciprocation of the pistons. A multiple of said engines may be utilized in combination to provide a multiple cylinder power plant. The engines drive a swash plate, which is formed with recessed, annular thrust surfaces. Projecting at right angles from the recessed, thrust surfaces are exhaust cams that engage valve stems through cam followers for actuating the same. The valve stems actuate the exhaust valves. The throat thickness of the swash plate between the recessed annular thrust surfaces is of uniform dimension along the circumferential paths thereof.

Abstract: A reciprocating engine, in particular for motor vehicles, incorporating a drive shaft, at least one pair of opposed pistons rigidly connected together by a rod, and a swash plate mechanism incorporating a pair of rotating swash plates coupled for rotation with the drive shaft and defining an annular cavity in which at least one oscillating plate is rotatably housed. Coupling means pivotally connect each oscillating plate with at least one respective rod connecting a pair of pistons, and a hydrodynamic thrust bearing is interposed between each of the two rotating plates and the facing surface of the oscillating plate.

Abstract: The engine disclosed herein comprises a number of pairs of pistons, the two pistons in each pair acting in unison and the number of pairs being arranged parallel to each other and said pistons also being positioned parallel to and in a circle around the mainshaft which has a cam lobe located at a convenient part of the mainshaft and encircling the mainshaft. The cam lobe has opposite surfaces which have rises and dips, or in other words, sinusoidal surfaces, and are in contact with pairs of bearings attached to connecting rods, these bearings being on opposite sides of the cam lobe and at one time being driven in one direction by one of the two pistons in each pair and then at another time in the opposite direction by the other piston in that pair, the two pistons of that pair being connected to each other by the same connecting rod carrying the bearings which press against the cam lobe.

Abstract: A double-acting piston is provided which is slidably mounted within a cylinder bore formed within the framework of a swash-plate type compressor, for carrying out a fluid compressing action. The piston comprises a pair of piston heads provided at its opposite ends and an intermediate coupling member coupling the piston heads to each other. The piston heads and the intermediate coupling member are separately fabricated from discrete pieces by means of stamping or the like. The piston heads each comprise a hollow first part extending axially inwardly of the piston and a hollow cylindrical second part extending radially outwardly from an outer end of the first part and serving as a slider. The first and second parts of the piston heads may be separately fabricated from discrete pieces by means of stamping or the like.

Abstract: A power transfer unit for transferring power between two separate hydraulic circuits comprising a casing, a pair of cylinder blocks in the casing, cylinders within each cylinder block, a piston in each cylinder, a leakage chamber within the casing, cam means located in said chamber for causing joint reciprocation of the pistons, pistons or extensions thereof extending from the cylinders to the cam means in the chamber, first valve means co-operating with the cylinders of the first block, second valve means co-operating with the cylinders of the second block, first leakage collecting means for the first valve means separate from said chamber, second leakage collecting means for the second valve means separate from said chamber, and a vent for said chamber separate from said leakage collecting means.By this arrangement any leakage to the chamber may be from either or both circuits and by virtue of the vent may be disposed of rather than fed back to either circuit.

Abstract: Rotary internal combustion engine of axial sliding vane type has sinusoidal shaped side walls with compensation of the mass forces allowing nearly friction-free and high speed operation with sufficient compression ratio. High power output is believed to make the invention comparable to the well-known Wankel engine.The various designs of the rotary machines can also be used as fluid pumps or fluid-operated motors.

Abstract: An axial-piston engine wherein the shaft has a circular groove for feeding a working medium, the groove provided on one side from a wave-like cam, as well as a circular groove for draining off the working medium, provided on the other side from the wave-like cam; the circular groove for feeding the working medium communicates with longitudinal ducts for feeding the working medium; the longitudinal ducts intercommunicate by means of transverse ducts provided in the zone of the circular groove for feeding the working medium and by means of transverse ducts in the zone of the shaft ports provided on the side of the circular groove for draining off the working medium; the circular groove for draining off the working medium communicates with the longitudinal ducts for draining off the working medium; the latter longitudinal duct are connected with each other by means of transverse ducts in the zone of the circular groove for draining off the working medium and transverse ducts in the zone of the shaft ports provid

Abstract: A uniflow steam engine of the multi-cylinder type wherein the cylinders are rotatably mounted within a jacket having a sinusoidal cam track therein. Extending through slots, the ends of which are the exhaust ports in the cylinders and into the cam track are cam followers which are mounted on the pistons for reciprocable movement therewith. At the head end of the cylinders there are apertures which rotate with registered cutouts in superimposed valve rings that control the flow of steam from manifolds at the head ends of each of the cylinders into the cylinders as the cylinders rotate. By adjusting the relative position between the valve rings, the length of time of steam introduced on each cycle may be adjusted and by concomitantly rotating both valve rings, the initial time for introduction of steam may be adjusted to alter lead or reverse torque.