Abstract: A pressure relief device has a chamber formed in a fixed scroll of a scroll-type machine, such as a scroll compressor. A piston is housed within the chamber releasably sealingly engaging a first passage which exposes the chamber to a discharge port formed in the fixed scroll. A second passage exposes the chamber to a suction plenum. A third passage exposes the chamber to pockets formed by the fixed and orbiting scrolls of the scroll compressor. In certain preferred embodiments, a pressure relief valve having a stem and a head is housed within a cavity formed in the piston. The head is biased by a spring into releasable sealing engagement with an aperture formed in the piston. The pressure relief valve passes fluid to the suction plenum whenever the difference between a discharge pressure and a suction pressure exceeds a predetermined value. The piston passes fluid to the suction plenum whenever the ratio of discharge pressure to suction pressure exceeds a predetermined value.

Abstract: A fuel delivery pump for a fuel injection pump for internal combustion engines, which includes a pair of gears that mesh with each other and are driven to rotate in a pump chamber. The gears deliver fuel from an intake chamber connected to a storage tank, along a supply conduit that is formed between the end face of the gears and the circumference wall of the pump chamber, into a pressure chamber connected to the fuel injection pump. A conduit is integrated into a housing of the fuel delivery pump and connects the intake chamber to the pressure chamber. The conduit can be opened by means of a pressure valve disposed in it, wherein the pressure valve is functionally connected to a throttle valve that throttles the fuel supply into the intake chamber as a function of the controlled pressure on the control valve via the pressure chamber.

Abstract: A multiple stage rotary compressor having a housing with a pump cavity and an orbiting ring piston in the cavity. A cylindrical post carried by the housing within the orbiting ring. A pair of vanes engaging the outer surface of the orbiting ring to define first-stage having a pair of primary pumping chambers in the cavity. A second pair of internal vanes contacting the inner surface of the orbiting ring to define a second-stage having a pair of secondary pumping chambers. A capacity control mechanism applied to the first-stage operative to limit the compressor capacity to the second-stage only. A second capacity control mechanism applied to the second-stage operative to variably bypass second-stage discharge to second-stage suction. The plurality of capacity controllers operating to establish varying compressor pump capacity depending upon the operating requirements of the compressor.

Abstract: An oil pump effects a pumping action to deliver oil from an inlet port to a first outlet port and also to a second outlet port. An oil supply passage is connected to the second outlet port. A regulator valve has a bore, a spool disposed in the bore, a pressure chamber, and a pressure admission port connected to the oil supply passage and communicating with the pressure chamber. A branch passage connected to the oil supply passage opens to the bore. The regulator valve also has relief port connected to the inlet port and opening to the bore, and a transfer port connected to the first outlet port. The spool disposed in the bore is moveable responsive to pressure within the pressure chamber between a first position in which the transfer port is connected to the branch passage and a second position in which the transfer port is connected to the relief port.

Abstract: An electronic control system dynamically varies the output capacity of a compressor by controlling plural valves associated with the compressor to provide pressurized air to a distribution system at an appropriate rate. The control system operates in any of three modes for standalone operation, including continuous run, auto/dual pressure band, and target pressure modes. In the first two modes, pressure bands are dynamically calculated based on load and unload values entered by an operator. These electronic control systems can also be connected in a peer-to-peer network to coordinate control of up to 16 compressors feeding the same distribution system, so as to maintain a desired target pressure in the system. A modem connected to the system supports remote diagnostics, monitoring, and control. Specialized startup, operating, and shutdown diagnostic algorithms prevent damage to the compressor and avert unsafe operating conditions.

Abstract: A rotary pump includes a housing having an inner surface that confines a rotor chamber. Two parallel shafts are mounted pivotally on the housing and extend axially through the rotor chamber. Two meshing multi-lobe rotors are mounted on the shafts within the rotor chamber, respectively. Each of the rotors has a plurality of lobes projecting radially therefrom toward the inner surface without contacting the inner surface.

Abstract: A compressor having a capacity-controlling mechanism is provided, by which the inner-peripheral surface of a blind opening provided in a piston is subjected to abrasion due to sliding and rotating motions of a coil spring in the piston. In the capacity-controlling mechanism, the coil spring is covered by a cover made of abrasion resistant material and the covered coil spring is arranged in the blind opening, or a head of the coil spring is engaged to an inner surface of the blind opening.

Abstract: A compound gear pump includes an internal gear pump including an outer rotor having on the outer periphery external teeth, an external gear pump including a rotor having on the outer periphery an external teeth circumscribed with the external teeth of the outer rotor, and a guide face arranged on the outer periphery of the outer rotor and being adjacent to the external teeth of the outer rotor in the axial direction thereof.

Abstract: A unique method of operating a scroll compressor includes the steps of opening a capacity modulation unloader valve slightly before shutdown of the scroll compressor. By opening the unloader valve, the occurrence of unpowered reverse rotation is reduced or eliminated. Most preferably, the unloader valve communicates an economizer line to a suction inlet line.

Abstract: A variable capacity vane compressor includes side members secured to opposite end faces of a cylinder block, respectively, and a rotary plate mounted in one of the side members, for adjusting compression starting timing of the compressor to thereby increase or decrease capacity or delivery quantity of the compressor.

Abstract: In a vane cell pump for pumping a pressure fluid from a container to a consumer, all the essential components and functional characteristics are accommodated in a bearing housing (10). The components include a suction connection (13) for connecting to the container, a pressure connection (14) for connecting to the consumer, a flow regulating valve (15) for regulating the pressure fluid pumped to the pressure connection (15), a pressure limiting valve (16) and suction and pressure conduits, which connect the work chambers to the suction connection (13), flow regulating valve (15), and pressure limiting valve (16). Also located in the bearing housing (10) is the sole radial bearing point of a drive shaft (12), by which a rotor (5) is supported in a cam ring (4). Between the cam ring (4), the rotor (5) and vanes (6) are inserted into it, so that work chambers are formed, which are defined in the axial direction by two control plates (7, 8).

Abstract: An oil pump apparatus which includes an oil pump for being driven by a driving source and for being connected to a plurality of components to which an oil is supplied from the oil pump and a control valve preventing the oil which is unnecessary to the components from flowing into the components, wherein at least one of the components is an actuator operated by an oil pressure generated by the oil pump and wherein the control valve permits the oil of which the quantity is smaller than that of the oil which is consumed by the actuator to flow into the components when the actuator is not operated and the control valve permits the oil of which the quantity is larger than that of the oil which is consumed by the actuator to flow into the components when the actuator is operated.

Abstract: In a displacement pump for pumping pressure medium out of a container to a consumer, in particular a servo-assisted steering system for motor vehicles, a pump package (2) is inserted into the interior of a housing (1). The pump package (2) comprises a rotor (3), a cam ring (4) and a plurality of operating rods (5). Between the cam ring (4) and the rotor (3), work chambers divided by the operating rods (5) are formed, which are bounded in the axial direction by control plates (8, 9). A bypass flow limiting to valve (11) is used to regulate an effective flow. A throttle (12) of the bypass flow limiting valve (11) is formed by at least one bore. The throttle (12) is embodied in a throttle insert (13), which to adjust a characteristic effective flow curve can be mounted in various positions between a pressure chamber of the pump and the bypass flow limiting valve (11). To that end, the throttle insert (13) is integrated with a control plate (9).

Abstract: A vane cell pump with a flow regulating valve (13), upon whose regulating piston (17) the outlet pressure and a spring force act on one side. Between a pressure chamber (1) and an outlet channel (19), an orifice (14) is provided in the control plate (7), the orifice having a frustum protruding into the pressure chamber. The frustum brings about a flow rate dependent on the pump rpm, which flow in the outlet channel (19) acts upon the face end of the regulating piston (17).

Abstract: In a scroll type compressor wherein a fixed scroll (8) has an end plate (8b) and an involute vane (8a) fixed to the end plate and is coupled to a movable scroll (5) so as to define a pair of working spaces therebetween, the end plate of the fixed scroll are formed a pair of cylinders each of which communicates with the working spaces via bypass holes (15a) and (15b) formed in the end plate of the fixed scroll. In each of the cylinders, a cylindrical piston valve member (10) is slidably received for opening and closing the bypass holes. Opening or closing of each bypass hole is determined depending on a position of an axial end of the piston valve member relative to the corresponding bypass hole.

Abstract: A scroll-type variable displacement compressor for use in an air conditioning system of a vehicle has a fixed scroll and an orbiting scroll with a lowered minimum operating capacity. A cylinder is formed within an end plate of the fixed scroll and accommodates a capacity control mechanism and a plurality of pairs of bypass holes which penetrate the end plate of the fixed scroll and the cylinder perpendicularly. Via one of a pair of bypass holes, the cylinder communicates with a compression chamber enclosed by the orbiting scroll and the fixed scroll, and via the other of the pair of bypass holes, the cylinder communicates with a low pressure chamber provided within rear portions of a compressor housing. One portion of the low pressure chamber is always open to the suction chamber. The communication between the cylinder and the low pressure chamber is controlled by the position of a piston slidably accommodated within the cylinder.

Abstract: The position of a screw compressor slide valve in a refrigeration system is controlled using compressor discharge gas sourced from a location where the gas is relatively oil-free and has undergone little or no pressure drop subsequent to its discharge from the compressor's working chamber.

Abstract: A power assisted steering apparatus for a vehicle has a driving source and an actuator for the vehicle's steering mechanism, to power assist the steering operation. The driving source, such as an engine, continuously drives a pump. A working passage is arranged so that working oil discharged from the pump is introduced into the actuator. A check valve is disposed in the working passage, between the actuator and the pump so that the working oil flows only one way to the actuator. An accumulator is connected to the working passage, between the check valve and the actuator to maintain a predetermined pressure in the working passage. A regulator is connected to the working passage, between the pump and the check valve to regulate flow to the actuator. When the pressure within the working passage reaches the predetermined pressure, the working fluid is dumped to a reservoir, bypassing the check valve, the accumulator, and the actuator.

Abstract: An oil-free two-stage vacuum pump includes first and second pump stages coupled in series. The first and second pump stages have discharge spaces capable of communicating with each other via a bypass passage. The bypass passage is provided with a pressure control valve which is closed when pressure in the bypass passage is lower than a predetermined pressure. This permits a reduction in scroll size. In addition, the pump is free from problems present in pumps with large scroll sizes such as drive shaft vibrations due to warping thereof at high speed rotation, noise and heat generation, and durability reduction due to causes such as non-uniform contact between stationary and revolving scrolls. Moreover, in a compression step in the first pump stage, withdrawn gas is under high pressure; the gas pressure in a sealed vessel is close to the atmospheric pressure in an initial stage of driving.

Abstract: A gas compressor has a first chamber for receiving a low pressure refrigerant gas. A main body has a second chamber for drawing in the low pressure refrigerant gas from the first chamber and undergoing a compression operation to compress the low pressure refrigerant gas into a high pressure refrigerant gas. A third chamber receives the high pressure refrigerant gas from the second chamber. A fourth chamber receives a lubricating oil and is subjected to the pressure of the high pressure refrigerant gas from the third chamber. An oil passage has an inlet port opening into the fourth chamber and an outlet port opening into the main body. The lubricating oil from the fourth chamber is supplied to the main body through the oil passage due to a pressure difference between the third chamber and one of the first chamber and the second chamber.

Abstract: Simplified capacity control mechanisms for scroll compressors include a fork operable to open and close vents associated with a pair of scroll compression chambers. A single fork opens and closes both vents simultaneously. In the past, separate members have been utilized to open and close the two individual valves, and they have sometimes been actuated in a non-synchronous manner. A control associated With the fork is operable to move the fork between the open and closed positions by simple electronic controls. In several embodiments, the electronic controls are operated simply to stop and start the electric motor for driving the compressor. Pressure forces on and associated valve element move the fork to the desired position between the open and closed positions. No separate control wires, or separate electronic valves, need to pass into the scroll housing. In another embodiment, an electric solenoid is actuated to move the fork between open and closed positions.

Abstract: A pressure relief or fluid bypass valve is provided which includes a valve body comprising a first piston, a second piston and a seating land disposed between the first and second pistons. The first piston is directed toward the discharge side of the fluid system; the second piston is disposed on the suction side of the fluid system. The first piston is configured to include an entrance orifice disposed toward the discharge side of the system and at least one exit orifice disposed between the second piston and the entrance orifice. A passageway provides fluid communication between the entrance orifice and the exit orifice. When the valve is in the fully open position, fluid is communicated from the discharge side, through the entrance orifice, through the passageway and out through the exit orifice to the suction side. The valve assembly includes a spring or other biasing means for biasing the valve body into the closed or sealed position.

Abstract: A pump includes a coaxially integrated pump bypass/relief valve element of high density polymer material seats against a hard metallic sleeve that is pressed into a first counterbore around the bypass flow channel with an interference fit. That axial end of the sleeve bearing the valve seat face projects, for a substantial proportion of the sleeve length, beyond the first counterbore shoulder into a second counterbore space to provide an annular space around the outside diameter surface of the sleeve to free the seat face end of the sleeve from direct structural restraint.

Abstract: An inlet pipe (7) and a discharge pipe (9) of a centrifugal compressor (1) are provided with respective solenoid valves (16, 17) for allowing a flow of fluid in a direction of flow under operation of fluid compression. One end of a bypass pipe (20) is connected to a part of the inlet pipe (7) located between the solenoid valve (16) and an impeller room (6). The other end of the bypass pipe (20) is connected to a part of the discharge pipe (9) located between the impeller room (6) and the solenoid valve (17). The bypass pipe (20) is provided with a solenoid valve (21) which closes under operation of fluid compression of the centrifugal compressor (1) while opening under deactivating operation of the centrifugal compressor (1).

Abstract: A dispensing system (20) for drawing fuel from a storage tank (22) to a nozzle (44). The system includes an above-tank suction pump (26) which draws fuel from the tank. The fuel is discharged from the suction pump into a vertically aligned air separator (38) so as to produce a fuel stream that is substantially free of air. The fuel stream is discharged from the air separator to a flow meter (30) and the nozzle through a fuel shutoff valve (46). The open/closed state of the fuel shutoff valve is controlled by a control actuator (48) based on the differential processor across the air separator. Should this differential pressure drop below a given level, the fuel shutoff valve is closed to prevent the system from inadvertently supply a fuel stream with an unacceptably high air content. Gaseous fluid removed by the air separator is supplied to an air eliminator (40). The fuel components of this fluid stream are removed in the air eliminator and returned to the suction pump.

Abstract: A variable capacity control scroll compressor, including: a cylinder disposed in the end plate of the fixed scroll incorporating a reciprocating shuttle valve to selectively enable fluid passage through a first group of bypass holes communicating with a pair of fluid pockets in a given compression stroke, and further through a second group of bypass holes communicating with a single fluid pocket as the pair of fluid pockets merge into one pocket during compression, sequential opening and closing of these bypass holes being controlled by a pressure control valve administering a control pressure Pm to operate the shuttle valve, the control valve being provided in the fixed end plate such that all of the control mechanism components are integrated into a single structure to reduce fabrication costs and enhance control efficiency.

Abstract: An oil pickup device is provided which is adapted to replace the standard oil pump cover plate and pickup tube typically utilized for use with a conventional oil pump for an internal combustion engine. The oil pickup device comprises an oil pump mounting section having a front wall which complimentarily conforms with the mating surfaces of the pump housing to provide an oil seal and for segregating the discharge chamber of the oil pump, and an oil pickup section for extending into the oil contained in the engine supply reservoir formed within a conventional oil pan to provide a continuous supply of oil to the oil pump. The oil pickup device further includes an oil filter or screen positioned between the oil pump mounting section and the oil pickup section for filtering inlet oil to prevent particulate matter, such as dirt or metal shavings, from entering into the oil pump.

Abstract: A variable displacement mechanism of fluid displacement apparatus includes a housing having a suction chamber and a discharge chamber, a first scroll member disposed within said housing and having an end plate from which a first spiral element axially extends, and a second scroll member disposed for non-rotatable orbital movement relative to the first scroll member and having an end plate from which a second spiral element axially extends. At least one control mechanism is disposed on the end plate of the first scroll member for controlling the fluid communication between the fluid pockets and the suction chamber based on the rotational motion of the driving mechanism.

Abstract: A rotary screw compressor having one or more stages (10, 20) is provided with a lift valve (14, 24) on each stage for unloading the compressor at starting up and rest periods. Each lift valve (14, 24) is biased by a spring (15, 25) towards an open position and can be closed by an actuator (17, 27). Each valve actuator (17, 27) is automatically controlled by an air conduit (32) establishing air communication between the discharge channel (23) of the compressor and each valve actuator (17, 27).

Abstract: A tandem pump apparatus is featured having a main suction passage connected to a fluid source. The main suction passage branches into first and second suction passages which, in turn, feed into first and second pumps. Each pump discharges a portion of the fluid to a return passage that is fluidly connected to the suction port of each respective pump. In each return passage, a return control valve is disposed to control the amount of fluid returned to the suction port. The tandem pump featured in this invention exhibits increased efficiency and decreased noise.

Abstract: The invention relates to a valve train of an internal combustion engine having hydraulic actuator for controlling a valve control device a function of engine speed and having a pump driven by the engine for supplying the actuator with working fluid. The pump is configured as a suction-controlled ring-gear pump having a sealing web ending over a plurality of pockets and featuring a delivery characteristic as a function of speed which is adapted to the working fluid requirement of said actuator. In addition, an internal gear pump is provided, particularly useful for such a valve train.

Abstract: The position of a slide valve in a screw compressor in a refrigeration system is controlled using a gaseous medium sourced from two or more sources of such fluid, both of which are in open flow communication with the slide valve actuating piston when the slide valve load solenoid is open. Preferred gas sources are a closed compression pocket in the working chamber of the compressor and the discharge passage downstream of the compressor's working chamber. Gas at sufficiently high pressure is available whenever the compressor is operating to ensure that the compressor will load under all conditions within the compressor's operating envelope.

Abstract: In a screw fluid machine including male and female rotors which are engaged with each other, a casing for accommodating both the male and female rotors, fluid working rooms which are formed by the male and female rotors and the casing, and fluid inlet and outlet ports which are provided in the casing so as to intercommunicate with one end portion and the other end portion of the working rooms, the helix angle of the screw gear constituting each of the male and female rotors is set to be continuously varied in a helix advance direction. Further, the screw gear is designed so that the peripheral length of a pitch cylinder in a helix advance direction on a development of a tooth-trace rolling curve on the pitch cylinder of the screw gear can be expressed by a substantially monotonically increasing function.

Abstract: An external-rotor-driven lubricating pump comprising a lubricant guidance part including a suction port, an outer wall, a carrier section, a discharge port, a lubricant feed space disposed between the carrier section and the outer wall and connected with the suction port, with a lubricant delivery space disposed between the carrier section and the outer wall and connected with the discharge port, and a pump part including a drive gear, an internally-toothed external rotor, with an externally-toothed internal rotor having one tooth less than the number of teeth on the external rotor, the external rotor and the internal rotor upon meshing pumping the lubricant from the lubricant feed space into the lubricant delivery space, with a shaft supporting the drive gear in the carrier section, the drive gear being fixed to the external rotor, the drive gear forming together with the external rotor the outer closure of the lubricating pump at its pump part end, with the internal rotor being mounted loosely on a collar o

Abstract: A method for controlling compressor discharge pressure in a compressor. The compressor comprising a compression module driven by a prime mover, the compression module having a discharge port through which a compressed fluid is discharged with a discharge pressure, and an inlet through which uncompressed fluid is flowed into the compression chamber, the flow of fluid through the inlet controlled by an inlet valve repositionable by an actuator driven by a motor. The method comprising the steps of running a discharge pressure control routine, comprising the steps of: calculating the difference between the actual discharge pressure and a predetermined setpoint discharge pressure; computing the required change in valve position to achieve the setpoint discharge pressure, the period of time the motor means must be energized to produce the change in valve position, and the direction the valve must be moved to produce the setpoint discharge pressure.

Abstract: The invention relates to a displacement pump, e.g. a vane cell pump, with a flow control valve (13) on the control piston (22) which acts on the pump pressure on the one hand and the consumer pressure taken via a choke device on the other. The control piston (22) acts as a pressure controller in which the pressure difference as the pump speed rises acts as a measure of the adjusted quantity conveyed. The choke device for setting the pressure difference contains a throttle piston (17) movable against the force of a spring (16) in a piston bore (15), which closes off an aperture (14) on the pressure side in a control plate (7) in the basic position. According to the invention, the piston bore (15) has a by-pass channel (18) which continuously connects the pump with a spring chamber (15A) in the throttle piston (17).

Abstract: Normally closed valve structure is located in a fluid path between the suction and discharge sides of a compressor. The valve structure opens upon a small pressure differential when the higher pressure is in the normal suction side which is indicative of reverse operation. Additionally, relief valve structure opens when the discharge pressure becomes excessive.

Abstract: A scroll machine has an intermediate pressure cavity which is operable to open and close a leakage path between the discharge zone and the suction zone of the scroll machine. The leakage path is closed when intermediate pressurized fluid is supplied to the cavity and the leakage path is open when the cavity is open to the suction zone of the compressor. A valve (102) which can be mechanical or electrical is used to open and close a passageway extending between the cavity and the suction zone of the machine. A high pressure relief valve is incorporated into the design of the compressor to prevent slugging. The high pressure relief valve will release the intermediate pressurized fluid to suction and/or discharge when the pressure within the intermediate pressure cavity exceeds a predetermined value.

Abstract: A vane cell (sliding vane) pump having a flow control valve (13) with a control piston (17). The control piston (17) operates as a pressure regulator, wherein a differential pressure that occurs with increasing pump speed is used as the measuring valve for the directly diverted conveyed flow. The directly diverted conveyed flow is introduced via a spray channel (25) into a distributing section (20), which is connected via curved suction arms (21,22) with suction zones (23,24). The distributing section (20) and the suction arms (21,22) nestle against a driveshaft such that the driveshaft acts as a flow divider. Additionally, the spray channel (25) terminates at the center of the distributing section (20) so that the sprayed off oil and the suction oil conveyed by the suction channel (18) is evenly divided between both suction zones (23,24). Since the hydraulic oil lubricates the driveshaft (12), no cavitation or abrasion can occur in this area.

Abstract: An oil pump effects a pumping action to deliver oil from an inlet port to a first outlet port and also to a second outlet port. An oil supply passage is connected to the second outlet port. A regulator value has a bore, a spool disposed in the bore, a pressure chamber, and a pressure admission port connected to the oil supply passage and communicating with the pressure chamber. A branch passage connected to the oil supply passage opens to the bore. The regulator valve also has relief port connected to the inlet port and opening to the bore, and a transfer port connected to the first outlet port. The spool disposed in the bore is moveable responsive to pressure within the pressure chamber between a first position in which the transfer port is connected to the branch passage and a second position in which the transfer port is connected to the relief port.

Abstract: A pump assembly (20) includes a rotor (40) and a stator (38) which are disposed within a housing (24) and partially define pumping chambers (56). Fluid is conducted through an inlet passage (104) to an inlet cavity (58) which is connected with the pumping chambers (56). Fluid is conducted from the pumping chambers (56) to an outlet (62) from the pump assembly (20). A tubular passage liner (112) is disposed in the inlet passage (104) and has a straight passage (138) through which fluid flow is conducted to the inlet cavity (58). The tubular passage liner (112) prevents erosion of the housing (24) during conduction through the inlet passage (104) of inlet fluid and fluid bypassed from the outlet (62) of the pump assembly (20). Projections (204 and 206) at one end of the tubular passage liner (112) are engageable with the stator (38) to limit movement of the tubular passage liner relative to the stator.

Abstract: A rolling-piston expander has a hermetic casing 7 provided with a suction pipe 3 and a discharge pipe 5, a cylinder 13 disposed in the casing, a roller 31 eccentrically rotated in the cylinder, an expansion chamber 39 defined by the roller and communicating with a suction port 47 and a discharge port 55, a shaft 19 for supporting the roller so that the roller may eccentrically rotate, a suction timing controller 51 consisting of the ports 47 and 51, for controlling the timing of the supply of gas into the expansion chamber, and a bypass for supplying high-pressure gas into the expansion chamber when the suction timing is off.

Abstract: A multicylinder rotary compressor capable of performing high performance capacity control operation without the need for an external piping or for a thicker partition plate which leads to a taller rotary compressing element or a longer bearing span of a bearing. The multicylinder rotary compressor has a rotary compressing element housed in a hermetic enclosure; wherein the rotary compressing element is equipped with an intermediate partition plate, a cylinder provided on each side of the partition plate, a rotary shaft having eccentric sections which are shifted relative to each other by 180 degrees in the direction of shaft rotation, rollers fitted onto the eccentric sections of the rotary shaft and which rotate in the cylinders, and bearings which seal the cylinders.

Abstract: A rotary blower (26) of the type used for supercharging a vehicle internal combustion engine includes an inlet housing (48) defining an inlet port (30) and an outlet port (34). The blower housing defines a bypass passage (38), through which outlet port fluid is bypassed back to the inlet port (30) whenever supercharging of the engine is not needed. The blower housing also defines a bypass bore (52) open to the exterior of the housing and intersecting the bypass passage (38). A bypass module (54) is disposed within the bypass bore (52) and includes a housing assembly (55). Within the bypass module (54) is a bypass valve member (92) which, in the subject embodiment, includes a cam portion (96), whereby the bypass valve (92) may be actuated by axial movement of a diaphragm (64) and a lever (74). The bypass module (54) cooperates with the housing (48) to define a retention arrangement (100-106), whereby the module is merely inserted into the bore (52), rotated to its assembled position (FIG.

Abstract: An oil pump apparatus incorporates, an oil pump housing, and a rotor located in the oil pump housing, wherein the rotor forms a first set of pockets having a capacity increasing toward the rotating direction of the rotor and a second set of pockets having a capacity decreasing toward the rotating direction of the rotor. The apparatus further includes a plurality of suction ports connected with the first set of pockets, each of the suction ports being isolated from other adjacent suction ports, a discharge port connected with the second set of the pockets, and a control valve.

Abstract: The invention relates to a valve train of an internal combustion engine having hydraulic actuator means for controlling a valve control means as a function of engine speed and having a pump driven by the engine for supplying the actuator means with working fluid. The pump is configured as a suction-controlled ring-gear pump having a sealing web extending over a plurality of pockets, and featuring a delivery characteristic as a function of speed which is adapted to the working fluid requirement of said actuator means. In addition, an internal gear pump is provided, particularly useful for such a valve train.

Abstract: A process and apparatus for controlling a rotary screw compressor capacity mechanism by manual pneumatic means. The apparatus compromises a specially placed rotary type cartridge valve enclosed in a valve body and housing. The assembly is attached via a flexible coupling to a rotating indicator rod that follows internal movement of the compressor's capacity piston mechanism. Manual movement of the assembly body opens valve ports that pneumatically position the compressor's internal capacity piston.

Abstract: A supercharger for supercharging intake air to an engine includes a casing which has a suction opening covering a suction-side end of the casing and a discharge opening on the side of the opposite end thereof, and a pair of rotors engaged with each other for compressing intake air introduced from the suction opening to supply the compressed air to the engine via the discharge opening. The casing has therein a communication passage for establishing a communication between the suction opening and the discharge opening. The supercharger also includes a bypass valve for opening and closing the communication passage, and an actuator for actuating the bypass valve.

Abstract: The compressor has a cylinder chamber, a control plate provided with an inlet hole, a gas exchange chamber, and gas supply passages. The cylinder chamber is in communication with the gas exchange chamber via the inlet hole in the control plate. The gas exchange chamber is in communication with the outside via the gas supply passages. When the displacement is small, a part of refrigerant gas inside the cylinder chamber is bypassed to the gas exchange chamber from the inlet hole in the control plate. Therefore, great pressure variations are induced in the gas exchange chamber, but the gas exchange chamber is in communication with the outside via the considerably long gas supply passages. These passages mitigate the pressure variations transmitted to the outside. Furthermore, the passages act also as a muffler. Consequently, pressure variations inside the gas exchange chamber are prevented from being transmitted to external piping and so on; otherwise noise would be produced.

Abstract: A gerotor pump is described for use with non-compressible fluids such as automotive coolant or hydraulic oil. The pump includes three separate pump outlet ports, a bypass return passage, find an integral four position spool valve. Increasing back pressure from a downstream load is sensed be the spool valve which moves accordingly to restrict the fluid supplied. In the first position a full flow fluid is supplied to the load from all three ports. In the second position one port is vented to the bypass and the flow from the other two ports is directed to the load. In the third position two ports vent to bypass, and one ports drives the load. In the fourth position all ports vent to bypass. In each case flow vented to bypass is not first compressed, permitting a smaller motor to be used.