Abstract: A pump including a pressure plate having two inlets and outlets, wherein each inlet has an auxiliary intake port in fluid communication with the inlet, and each outlet has an auxiliary discharge port in fluid communication with the outlet, and a cam/rotor assembly attached to the pressure plate. The cam/rotor assembly includes a rotatable cam having an opening, a rotor within the cam opening, the rotor having multiple radial slots, and multiple vanes that move within the slots, wherein a pumping chamber is defined by a space between rotor and cam. Rotor rotation within the cam causes the vanes to extend and retract within the pumping chamber. The movement of the vanes discharges into the outlets and auxiliary discharge ports a fluid drawn into the pumping chamber via inlets and auxiliary intake ports. The auxiliary inlet and auxiliary discharge ports reduce pressure pulsations in a variable displacement dual-lobe vane pump.

Abstract: A split discharge vane pump is disclosed having a pump body that includes an interior pumping chamber having a central axis and defining a continuous peripheral cam surface, the cam surface including four quadrantal cam segments, wherein diametrically opposed cam segments have identical cam profiles, and each cam segment defines an inlet arc, a discharge arc and two seal arcs. A rotor is mounted for axial rotation within the pumping chamber and a plurality of circumferentially spaced apart radially extending vanes are mounted for radial movement within the rotor, wherein the plurality of vanes define an equal number of circumferentially spaced apart buckets which extend between the rotor and the cam surface of the pumping chamber for carrying pressurized fluid.

Abstract: A scroll compressor is provided with injection tubes which extend through an upper shell and into a fixed scroll member. The injection tubes are fixed relative to the fixed scroll member, and may be press-fit or otherwise secured. This arrangement simplifies the provision of injection ports into a scroll compressor.

Abstract: A scroll compressor that utilizes liquid or vapor injection to cool a working fluid being compressed by an orbiting scroll member and a non-orbiting scroll member, and/or to increase the efficiency of the compressor. An injection fitting is secured to, and extends through, the compressor housing and receives liquid or vapor working fluid from a source external to the compressor. The non-orbiting scroll member may be fixedly mounted with respect to the crankcase of the compressor, and internal passages formed within the crankcase and the non-orbiting scroll member, which are substantially isolated from the suction pressure and discharge pressure chambers of the compressor, are used to convey liquid or vapor working fluid from the injection fitting into intermediate pressure working pockets defined between the scroll members.

Abstract: A rotary positive displacement pump employs the higher pressure available at a region within the rotor chamber after the outlet port to augment the force of a biasing spring in a control system. A biasing spring with a lower spring force can thus be employed in the control system, resulting in a pump pressure output characteristic which can more closely match the operating speed varying working fluid requirements for devices supplied by the pump.

Abstract: A split discharge vane pump is disclosed having a pump body that includes an interior pumping chamber having a central axis and defining a continuous peripheral cam surface, the cam surface including four quadrantal cam segments, wherein diametrically opposed cam segments have identical cam profiles, and each cam segment defines an inlet arc, a discharge arc and two seal arcs. A rotor is mounted for axial rotation within the pumping chamber and a plurality of circumferentially spaced apart radially extending vanes are mounted for radial movement within the rotor, wherein the plurality of vanes define an equal number of circumferentially spaced apart buckets which extend between the rotor and the cam surface of the pumping chamber for carrying pressurized fluid.

Abstract: A hydraulic motor having a cooling system includes a stator, a rotor that rotates and orbits in the stator, a drive link connected to the rotor, and a housing connected with the stator. The housing includes a working fluid inlet port, a working fluid outlet port, a cooling fluid inlet port, and a cooling fluid outlet port. Each port extends through the housing and is configured to connect with a different associated external fluid line. Pressurized fluid enters the working fluid inlet port to rotate and orbit the rotor en route to the working fluid outlet port. The cooling fluid ports are isolated from the working fluid inlet port and the working fluid outlet port within the housing.

Abstract: A “TurboMotor” positive displacement rotary-piston machine comprises a casing having an annular working chamber and intake and exhaust ports, two drive shafts coaxial with the annular surface defining the working chamber and provided with rotary pistons on one end thereof and with arms on the other end thereof, a stationary central gear coaxial with the surface defining the working chamber and with the drive shafts, an output shaft concentric with the drive shafts and having an offset portion carrying a carrier and a planetary gear, the planetary gear being in mesh with the stationary central gear the carrier being pivotally connected to the arms of both drive shafts through the connecting rods. The annular working chamber of the casing communicates with the intake ports and exhaust ports and/or exit channels and entrance channels arranged sequentially and contiguously.

Abstract: A capacity varying type rotary compressor and a refrigeration system having the same are provided. The capacity varying type rotary compressor includes a casing that contains a certain amount of oil and maintains a discharge pressure state; a motor installed in the casing that generates a driving force; one or more cylinder assembly fixed in the casing, having a compression space that compresses a refrigerant by a rolling piston that performs an orbit motion and a vane that performs a linear motion by contacting the rolling piston, and having a vane pressure chamber formed at a rear side of the vane that implements a normal driving as the vane contacts the rolling piston or a saving driving as the vane is separated from the rolling piston; and a mode switching device that selectively supplies a suction pressure or a discharge pressure to the vane pressure chamber of the cylinder assembly according to a driving mode.

Abstract: A rotary expander includes: a cylinder (61); a piston (62) disposed inside the cylinder (61); closing members disposed with the cylinder (61) being sandwiched therebetween; and an injection passage for introducing further a working fluid in the expansion process of the working fluid. An introduction outlet (65c) of the injection passage leading to the working chamber (69) is provided at a position located inwardly away from the inner circumferential surface (61b) of the cylinder (61), on one of the closing members, in such a manner that the injection passage and the discharge passage are not communicated with each other.

Abstract: The invention relates to increasing the fluid capacity and the fluid discharge pressure of a rotary sliding vane fluid compressor without significantly increasing the fluid discharge temperature. According to the invention supplemental air under pressure is added to a compressor's rotating pocket to increase the fluid capacity and fluid pressure in the pocket.

Abstract: A supercharger compressor includes a plurality of rotors rotatably mounted in a housing, a first inlet for air, a second inlet for recirculated exhaust gas, and a flow separator. The flow separator is arranged interior the housing and configured to form a slideable seal with at least one rotor of the plurality of rotors, the slideable seal fluidically isolating the first inlet from the second inlet, at least in part, and retarding pressure equalization therebetween.

Abstract: A new type of progressive cavity compressor is intended primarily for 3 to 10 ton vapor-cycle air conditioning systems. Major working section elements include a rotor, a stator, inlet ports, an outlet endplate, and outlet check valves. The helical rotor is driven in an eccentric orbital path inside the helical stator. In the preferred embodiment, the rotor and stator helices have varying (non-uniform) pitch in the working section. Rotor-stator running clearances are tight, to minimize leakage. Two outlet check valves regulate refrigerant discharge flow and pressure. Efficient compression is provided over a wide range of compression ratios, corresponding to a wide range of ambient temperatures in an air conditioning application. The invention can improve the energy efficiency of air conditioning systems, especially at off-design conditions.

Abstract: A screw pump and pumping arrangement including a screw pump having a chamber and externally threaded rotors mounted on shafts for counter-rotation and flow paths with fluid inlets located at a common low pressure side of the chamber.

Abstract: A rotary machine which can be either a pump or an internal combustion engine has a housing enclosing a plurality of rotor spindles lying on the surface of an imaginary cone for driving an output shaft positioned at the vertex of the imaginary cone. The spindles have a beveled gear on one end and engaging an output shaft and a conical bearing on the other end. Angled eccentric rotors are mounted to each spindle shaped to maintain tangential sliding contact with two adjacent rotors to form a compression or combustion chamber. A spherical version of a compressor or an engine uses a plurality of rotary pistons each of which is eccentrically mounted and forms a spherical segment. Each rotary piston is mounted for tangential sliding contact with at least two other rotary pistons to form a displacement chamber therebetween. The rotary pistons use a generally “tear drop” shape. A rotary pump has a housing having a manifold for distributing intake and exhaust air.

Abstract: A scroll type compressor, according to the invention, comprises first and second scroll members each having an end plate and a scroll wall projecting from the end plate. The scroll members have their scroll walls interleaved with one another to define therebetween a compression chamber and upon relative orbiting movement between the scroll members the compression chamber migrates to compress a compressible medium. The scroll walls are each comprised of a plurality of alternating straight line wall portions and circular arc portions. The straight line wall portions can be modified to house a catalyst or a fluid port. Or the straight line sections may be telescopically extendible in length to thereby adjust the displacement of the compressor.

Abstract: A scroll compressor may incorporate controlled bending of a scroll member to compensate for axial deformations that can occur between the scroll members. The controlled bending may be through the use of fluid pressure in a sealed chamber that communicates with a surface of the scroll member opposite the intermeshing wraps. Fluid passageways can extend through the scroll member between the sealed chamber and the intermeshing wraps. The controlled bending can increase the uniformity of the contact between the scroll members and improve the efficiency of the compressing operation.

Abstract: A compressor may include a housing and first and second scroll members supported within the housing, each having an end plate with a spiral wrap extending therefrom and meshingly engaged with the other to form a series of compression pockets operating at an intermediate fluid pressure between a suction pressure and a discharge pressure. A first passage in communication with one of the compression pockets extends from a first side of the first end plate to a second side of the first end plate generally opposite the first side. A modulation plate overlies the second side of the first scroll member for radial displacement between first and second positions. The modulation plate isolates the first passage from communication with a suction pressure region of the compressor when in the first position and provides communication between the first passage and the suction pressure region when in the second position.

Abstract: A compressor may include a shell assembly defining suction and discharge pressure regions, first and second scroll members disposed within the shell assembly, and a capacity modulation assembly. The first scroll member may include a first end plate defining a discharge passage, a biasing passage, a modulation port, a first spiral wrap extending from a first side of the first end plate, and an annular hub extending from a second side of the first end plate. The second scroll member may include a second spiral wrap meshingly engaged with the first spiral wrap forming a suction pocket in communication with the suction pressure region, intermediate compression pockets, and a discharge pocket in communication with the discharge passage. A first intermediate compression pocket may be in communication with the biasing passage and a second intermediate compression pocket may be in communication with the modulation port.

Abstract: A compressor includes a housing, a first scroll member supported within the housing and having a first end plate with a discharge passage, and a second scroll member supported within the housing and having a second end plate with a second spiral wrap extending therefrom and meshingly engaged with the first spiral wrap to form a series of pockets. A first aperture extends through the first end plate and is in communication with a first product of the series of pockets. A modulation assembly axially biases the first scroll member into engagement with the second scroll member when the first aperture is in communication with a suction pressure region of the compressor.

Abstract: A compressor may include a housing, orbiting and non-orbiting scroll members, a first porting, and a second porting. The first and second porting may each extend through the end plate of the non-orbiting scroll member and may each have an angular extent of at least twenty degrees. An ending point of the first porting may be rotationally spaced from a starting point of the first porting by the angular extent in a rotational direction of a drive shaft of the compressor. An ending point of the second porting may be rotationally spaced from a starting point of the second porting by the angular extent in a rotational direction opposite the rotational direction of the drive shaft. The ending point of the second porting may be rotationally spaced from the starting point of the first porting by less than one hundred and eighty degrees in the rotational direction of the drive shaft.

Abstract: A compressor may include a housing, first and second scroll members, and a compressor output adjustment assembly. The first scroll member may define a first chamber having first and second passages in communication therewith, a second chamber having third and fourth passages in communication therewith, and first and second apertures. The first and third passages may be in communication with a first pressure source and the second and fourth passages may be selectively in communication with a second pressure source. The compressor output adjustment assembly may include a first piston located in the first chamber and displaceable between first and second positions and a second piston located in the second chamber and displaceable between first and second positions. The first piston may isolate the first aperture from the first passage and the second piston may isolate the second aperture from the third passage when in their respective second positions.

Abstract: A gear box assembly as used in an inverted portal axle or transfer case includes a drive gear and at least one driven gear in meshing engagement with the drive gear at a contact point. A gear housing closely surrounds portions of an outer circumference of the drive and driven gears to form a baffle area. The gear housing includes an discharge orifice that is located near the contact point and a fluid gallery that extends from the discharge orifice to other locations within the gear housing. As the drive gear drives the driven gear, fluid is pumped into the discharge orifice and through the fluid gallery to fluid outlets positioned at desired locations to lubricate other gear box components. Radial inlets with elongated chamfers and stator vanes can be formed within the gear housing to draw air ingested during pumping away from the discharge orifice. Additionally, a bypass loop can be used to scavenge unwanted air ingested into meshing gear teeth.

Abstract: A supercharger compressor includes a plurality of rotors rotatably mounted in a housing, a first inlet for air, a second inlet for recirculated exhaust gas, and a flow separator. The flow separator is arranged interior the housing and configured to form a slideable seal with at least one rotor of the plurality of rotors, the slideable seal fluidically isolating the first inlet from the second inlet, at least in part, and retarding pressure equalization therebetween.

Abstract: An air aspirated hybrid heat pump and heat engine system (20) for selectively heating and cooling a space (22) having an flow path (24) including a compressor (76), a heat exchanger (32), an expander (78), and a generator (68). A combustion chamber (62) is in the flow path (24) for combusting a fuel in the air during a high heating mode. The heat exchanger (32) dissipates the heat from the air, and the expander (78) depressurizes the air while powering the generator (68). Also included is a positive displacement rotating vane-type device (36) having a stator housing (38) extending between longitudinal ends (40). A compression chamber inlet (52) and an expansion chamber outlet (58) are located on opposite longitudinal ends (40) of the stator housing (38) to be in simultaneous communication with the same chamber (48, 50)). A fluid enters the device through the compression chamber inlet (52) and pushes fluid out of the expansion chamber outlet (58).

Abstract: A scroll compressor has a reed valve mounted on a central discharge port. The reed valve has a valve portion at a first end and a pin holding the reed valve onto a non-orbiting scroll member at a second end. The reed valve extends along a plane which is non-perpendicular to a drive axis of a drive shaft such that the second end, which receives the pin, is further removed from the compression chambers than is the first end of the reed valve, which covers the central discharge port.

Abstract: A pump, for example, a vane-cell pump or a roll-cell pump, especially a gear pump, includes a two-stroke pump contour which includes at least one rise zone, at least one large circular area, at least one fall zone and at least one small circular area. The pump includes a rotor with radially displaceable vanes or rolls arranged in radial slits inside the pump contour.

Abstract: A scroll compressor is provided with injection tubes which extend through an upper shell and into a fixed scroll member. The injection tubes are fixed relative to the fixed scroll member, and may be press-fit or otherwise secured. This arrangement simplifies the provision of injection ports into a scroll compressor.

Abstract: A pump including a pressure plate having two inlets and outlets, wherein each inlet has an auxiliary intake port in fluid communication with the inlet, and each outlet has an auxiliary discharge port in fluid communication with the outlet, and a cam/rotor assembly attached to the pressure plate. The cam/rotor assembly includes a rotatable cam having an opening, a rotor within the cam opening, the rotor having multiple radial slots, and multiple vanes that move within the slots, wherein a pumping chamber is defined by a space between rotor and cam. Rotor rotation within the cam causes the vanes to extend and retract within the pumping chamber. The movement of the vanes discharges into the outlets and auxiliary discharge ports a fluid drawn into the pumping chamber via inlets and auxiliary intake ports. The auxiliary inlet and auxiliary discharge ports reduce pressure pulsations in a variable displacement dual-lobe vane pump.

Abstract: A two-stage rotary compressor having a compression mechanism including a single muffler housing member. The single muffler housing member at least partially defines an intermediate pressure discharge cavity and a discharge pressure discharge cavity. In one exemplary embodiment, the compression mechanism includes a cylinder block having a plurality of vanes positioned within slots formed in an inner cylindrical surface of the cylinder block. The slots are in fluid communication with the discharge pressure discharge cavity and receive discharge pressure working fluid to bias the vanes radially inwardly. In another exemplary embodiment, the cylinder block includes a plurality of passages for the delivery of working fluid to and from the cylinder block.

Abstract: A pump having a rotor, a stator, a housing enclosing the rotor and the stator, the housing having an inlet for a fluid, and a port for receiving a fluid which acts on deposits on a surface of the rotor and on a surface of the stator positioned downstream from the inlet.

Abstract: A hydraulic traction system for vehicles is described. The system comprises a hydraulic vane motor mounted at each wheel of the vehicle, and equal number of identical hydraulic vane motors operated as engine driven pumps, and a control system for regulating the flow and direction of hydraulic oil during operation. The hydraulic motor is of a novel design that has a hollow non-drive shaft that accepts incoming hydraulic oil, this allows internal components of the hydraulic motor to be arranged in such a way to improve the efficiency of the hydraulic traction system.

Abstract: A capacity varying type rotary compressor and a refrigeration system having the same are provided. The capacity varying type rotary compressor includes a casing that contains a certain amount of oil and maintains a discharge pressure state; a motor installed in the casing that generates a driving force; one or more cylinder assembly fixed in the casing, having a compression space that compresses a refrigerant by a rolling piston that performs an orbit motion and a vane that performs a linear motion by contacting the rolling piston, and having a vane pressure chamber formed at a rear side of the vane that implements a normal driving as the vane contacts the rolling piston or a saving driving as the vane is separated from the rolling piston; and a mode switching device that selectively supplies a suction pressure or a discharge pressure to the vane pressure chamber of the cylinder assembly according to a driving mode.

Abstract: Disclosed is a pressurized internal oil management system, comprising an oil dam, at least one oil separator, at least one oil collection manifold, at least one oil pump, and one or more paths for returning the separated oil; said system integrated within the casing of a fluid displacement device to supply adequate lubrication regardless of orientations under zero to full gravity, and methods and applications related thereto. Fluid displacement devices useful herein include oil lubricated rotary or reciprocating machinery, such as compressors, expanders, pumps and engines, in the casing of which exists one or more drive mechanisms that can be utilized to operate the oil management system, in most cases without even increasing the size of the casing.

Abstract: A gear pump capable of alternately distributing a fluid in two distinct utilization circuits without the need for a switch. The gear pump (1) comprises two fluid outlet ports (5, 6) connected to two fluid utilization circuits and linked to the discharge chamber (C) of the pump via an integrated commutation (7). These commutation (7) comprise two distribution circuits (50, 60), located in a fixed support plate (70), and two buffer channels (30, 40), located in the rotary toothed wheels (3), arranged so as to alternately open and close the distribution circuits according to a commutation cycle that approximately corresponds to the rotation of the toothed wheels over half a revolution.

Abstract: The invention relates to a motor having an inner motor compartment (18). A rotatable rotor (20) can be driven by applying a pressure medium to it, wherein the pressure medium expands in a working region (40) of the motor compartment (18). A brake element (22) for braking the rotor (20) is disposed axially adjacent thereto. The brake element (22) and the rotor (20) are axially displaceable in relation to one another and form a spring-loaded friction pair (48, 50). In order to be able to achieves a higher braking effect due to stronger springs (52), a pressure chamber (60) is provided, the extension of which in the cross-section thereof is larger than the cross-sectional extension of the motor compartment (18) in the working region (40). The pressure chamber (60) is delimited axially at least on one side by the brake element (22).

Abstract: The present invention relates to a resilient material lined stator and method of forming. A method of forming a resilient material lined stator can include disposing a resilient material tube 400 with a profiled helical inner surface 401 into the bore of a body 420. A cast material 410 can be disposed therebetween. The cast material 410 can bond to the body 420 to form a resilient material lined stator or the body 420 can be removed. The cast material 310 can include a conduit 312 or conductor 314 extending therethrough. The cast material 310 can include a pathway 316 formed therethrough. The resilient material can be an elastomer.

Abstract: A scroll compressor is provided with a passage for providing both an unloader function and an economizer injection function. This common passage communicates with separate ports. The ports that are exclusively used for by-pass unloading operation are open only during by-pass unloading operation, but blocked off by a check valve during vapor injection operation. The other, normally smaller vapor injection ports are open for both vapor injection and by-pass unloading operation. By utilizing these two sets of ports, a smaller total port area is provided for vapor injection operation and a much larger total open port area for by-pass operation. The different open port areas for by-pass unloading operation and vapor injection operation allows optimization of compressor operation at both of those regimes of operation.

Abstract: Two rotary mechanism parts (70, 80) are provided in a rotary expander (60). The first rotary mechanism part (70) is smaller in displacement volume than the second rotary mechanism part (80). A first low-pressure chamber (74) of the first rotary mechanism part (70) and a second high-pressure chamber (83) of the second rotary mechanism part (80) are fluidly connected together by a communicating passageway (64), thereby forming a single expansion chamber (66). High-pressure refrigerant introduced into the first rotary mechanism part (70) expands in the expansion chamber (66). An injection passageway (37) is fluidly connected to the communicating passageway (64). When an motor-operated valve (90) is placed in the open state, high-pressure refrigerant is introduced into the expansion chamber (66) also from the injection passageway (37). This makes it possible to inhibit the drop in power recovery efficiency, even in the condition that causes the actual expansion ratio to fall below the design expansion ratio.

Abstract: The invention relates to a dividing device, comprising an outer housing with an inlet and at least two outlets, at least two pump chambers placed adjacently of each other in the outer housing, each with a pump chamber infeed connected to the inlet and each with a pump chamber discharge connected to the outlet, at least two vane-type rotors, one in each pump chamber and with a rotation axis in line, each vane-type rotor comprising a hub provided with continuous vanes which are slidable through the hub along their longitudinal axis and almost perpendicularly of the axis of the hub, wherein the outer housing is divided into outer housing segments.

Abstract: The present invention provides a combined gas and liquid pump (46) for an internal combustion engine (10). The pump (46) includes a casing (58) having a cavity (60) containing a rotor (62) and a vane (64) slidably mounted to the rotor (62), wherein the cavity (60) is provided with an inlet (50) connectable to a gas source, a further inlet (48) connectable to a liquid source which is separate to the gas source, and an outlet (56). The rotor (62) and vane (64) are movable to draw liquid and gas into the cavity (60) through the respective inlets (50,48) and to move said liquid and gas out of the cavity (60) through the outlet (56). The inlets (50,48) are arranged through the casing (58) such that fluid is drawn first through one of the inlets and then through the other of the inlets before being discharged through the outlet (56).

Abstract: A fluid compressing system includes: a rotary compressor including a housing defining an oil chamber and an oil-releasing port in fluid communication with the oil chamber; a discharging pipeline connected to the housing for passage of a high pressurized fluid therethrough; an oil-adjusting tank connected to the discharging pipeline and the oil-releasing port for receiving lubricant oil from the oil chamber so as to alleviate oil swirling in the oil chamber; an oil filter connected to the discharging pipeline for separating the lubricant oil from the high pressurized fluid; and a first capillary connected to the oil filter and the housing for recycling filtered lubricant oil from the oil filter into the oil chamber.

Abstract: An air cylinder for pneumatic tool includes a cylinder body, and front and rear cylinder caps covered onto two ends of the cylinder body. The cylinder body defines a cylinder chamber for mounting a rotor therein, and has an air passage with two open ends of the passage respectively located at two ends of the cylinder body. The rear cylinder cap is provided with an air inlet that is aligned with the air passage and has an inner end communicable with the cylinder chamber. A guide opening is formed on an inner end surface of the front cylinder cap to communicate the air passage with the cylinder chamber. At least one of the two cylinder caps is provided with a plurality of exhaust holes communicating with the cylinder chamber for discharging exhaust air.

Abstract: A vane pump according to the present invention is characterized in that a position of a first suction port located in the forward rotation direction of a rotor is brought closer to a suction port than a position of a second suction port located in the backward rotation direction of the rotor with the suction port as reference by positioning a side plate in the state where the discharge port is brought close to a mounting portion.

Abstract: A scroll compressor having a scroll wall arrangement with a fixed scroll having fixed scroll walls and an orbiting scroll having orbiting scroll wall, an inlet at a radially outer portion and an outlet at a radially central portion, a first flow path defined by the orbiting and fixed scroll walls and extending from the inlet to the outlet, gas entering through inlet at a pressure and exhausting through outlet at a second pressure higher than the first pressure. Scroll wall arrangement having a second inlet through which gas enters at a third pressure and follows a second fluid path where it is exhausted through the outlet at the second pressure to form two flow paths having respective inlets. The third pressure at which gas enters through inlet is different from the first pressure, and lower than the second pressure.

Abstract: A surgical pneumatic motor is designed to be used with or without an MRI machine without affecting or influencing the magnetic characteristic of the MRI machine. The motor includes an improved vane motor with undercuts in the spindle to increase the power faces of the vanes and spindle itself, the holes in the cylinder are modified to increase the sealing area between the spindle. The inlet cylindrical holes and the cylinder holes and grooves are arranged to enhance the life . Wear of the edge of the vanes is decreased by the judicious location of the discharge holes. The bearings are cooled by bypassing a portion of cylinder air before re-entering the air. The noise is attenuated by a cris-cross plug in the hose the temperature of the handle is reduced by a serrated sleeve. Slipping discs in the seal serves to enhance seal life.

Abstract: An oil pump for a compressor is provided. The oil pump includes a pump body coupled to a driving shaft, and a pumping member coupled to the pump body so as to define a pumping part and a pump cover is coupled to a lower side of the pump body therebetween. A lower suction unit provided at a lower side of the pump body draws fluid into the pump from a lower portion of a supply area, and an upper suction unit draws fluid into the pump from an upper portion of the oil supply area.

Abstract: A pump, in particular a hydraulic pump for a power steering system, has a housing. The pump is a prefabricated structural unit in which the end faces of the housing are closed by a flange and by a cover, respectively. The flange and the cover are braced against each other by at least one holding part.

Abstract: The invention provides a dual inlet screw pump, in which a chamber 18 defines with first and second externally threaded rotors 30, 32 respective fluid flow paths within the chamber 18. This can enable fluid entering the pump via a first inlet 20 to be pumped substantially in isolation from fluid entering the pump via the second inlet 22.

Abstract: Disclosed is a displacement type expansion machine. In the displacement type expansion machine, a communicating passage (72) for allowing fluid communication between an expansion-process intermediate position and an outflow position in an expansion chamber (62) is provided thereby to allow the fluid at the outflow side to return to the expansion chamber (62). Such arrangement prevents the pressure of the expansion chamber (62) from being lowered to an excessive extent in predetermined operating conditions, thereby avoiding the drop in power recovery efficiency.