Abstract: A vane pump includes: a suction port configured to guide working oil to a pump chambers; a discharge port configured to guide the working oil discharged from the pump chambers; and a notch formed from an opening edge portion of the suction port towards a reversing direction of a rotation direction of a rotor, wherein the pump chambers each communicates with the suction port through the notch during a course of the transition from the state, in which the pump chamber is in communication with the discharge port, to the state, in which the communication with the discharge port is shut off, as the rotor is rotated.

Abstract: A cam ring is capable of moving while rolling on a cam support surface. The cam ring is provided such that within a range in which the cam ring can move on the cam support surface, an eccentricity amount increasing-side angle is always greater than an eccentricity amount decreasing-side angle. On a plane perpendicular to the rotation axis of a driving shaft, the eccentricity amount increasing-side angle is an angle, in a direction opposite to a rotation direction of the driving shaft, from a first reference line, which connects a tangent point between the cam ring and the cam support surface to a rolling center of the cam ring, to a starting end of a first discharge port. The eccentricity amount decreasing-side angle is an angle, in the rotation direction of the drive shaft, from the first reference line to a terminal end of the first discharge port.

Abstract: An arrangement of a variable capacity vane pump for an automobile is provided that includes a pump housing having an outlet and inlet. A pump control ring is provided having a cavity. The control ring is positioned within the housing to move about a pivot. A vane pump rotor is positioned within the cavity of the pump control ring. A position of the pump control ring determines an offset between a center of the pump control ring cavity and an axis of rotation of the vane pump rotor. Vanes are provided that are driven by the rotor and which engage an interior surface of the pump control ring. The vanes and the engaged surface defining working fluid chambers. A first control chamber is provided. The first control chamber is exposed to a first side of the pivot between the pump housing and the outer surface of the pump control ring. The first control chamber is operable to receive pressurized fluid to create a force to move the pump control ring to reduce a volumetric capacity of the pump.

Abstract: A first communication groove (38) extending from a start point of a discharge port (36) in a direction opposite to rotation direction of vanes (22) is formed. A first end portion (38E) of this groove is connected to the start point of the discharge port (36). When a front-side vane in a rotation direction of a driving shaft (11) is positioned at the start point of the discharge port (36), a second end portion (38S) of the groove is positioned at a rear side in the rotation direction with respect to a rear-side vane coming immediately after the front-side vane, and communicates with a suction port (35). A part of working fluid in a front-side pump chamber (27-1) can therefore be introduced into a rear-side pump chamber (27-2) that communicates with the suction port (35), thereby lessening excessive pressure increase of the front-side pump chamber (27-1) and suppressing pulsation phenomenon.

Abstract: A method for actuating a hydraulic system of a transmission comprising a variable displacement hydraulic pump and a pilot-controllable system pressure valve, the method including, in order to determine a pump characteristic curve of the hydraulic pump, initially transferring the hydraulic system into a defined operating condition range in which the volumetric output flow, routed via the system pressure valve and applied at the system pressure valve by the hydraulic pump, is greater or less than a hydraulic fluid flow out of the hydraulic system. The method further includes pilot-controlling the system pressure valve to set a defined pressure level of the system pressure. The method additionally includes reducing or increasing the volumetric output flow while monitoring the system pressure, and determining a volumetric output flow corresponding to the hydraulic fluid flow of the hydraulic system with a certain deviation of a current system pressure from the defined system pressure.

Abstract: A variable displacement pump according to the present invention is notably configured such that the opening area of a variable metering orifice (MO) is variably controlled by a second control valve (6) as a spool valve having a second spool valve body (61). According to this type of the second control valve (6), a larger amount of movement (stroke movement) of the second spool valve body (61) can be ensured. Consequently, the opening area of the variable metering orifice (MO) can be controlled without being restricted by a range of variation in a proper discharge amount based on an amount of movement of a cam ring (2), thereby achieving sufficient energy conservation of the pump.

Abstract: A variable displacement rotary vane pump. The pump has a pump body, a rotor with vanes that rotates inside the pump body around a rotation axis, an oscillating stator arranged in an eccentric position around the rotor, a fulcrum for the rotation of the oscillating stator with respect to the pump body, and adjusting means for adjusting the displacement of the pump. The adjusting means act on the oscillating stator to move it with respect to the rotor and the pump body. The fulcrum is integrally formed with the oscillating stator and is housed in a recess formed in the pump body. The pump has a sliding element between the fulcrum and the recess. The sliding element is at least partially free to rotate within the recess.

Abstract: An oil supply device includes an oil pump and an oil control valve. The oil control valve is connected to a control oil chamber of the oil pump via a control oil passage that includes an oil descent passage and an oil rise passage. One end of the oil descent passage on the control oil chamber side is disposed at a position closer to a bottom of the vehicle than the other end on the oil control valve side. The oil rise passage is disposed at a position closer to the control oil chamber side than the oil descent passage. One end of the oil rise passage on the control oil chamber side is disposed at a position closer to a top of the vehicle than the other end on the oil control valve side.

Abstract: Provided is a variable displacement vane pump which is capable of reducing fluctuation in discharge rate. In the variable displacement vane pump, a first straightening vane 33 closest to one end-side opening 14a of a discharge passage 14 among a plurality of straightening vanes 33, 34 and 35 arranged within the discharge pressure chamber 202 is located so as not to face a communication hole 32 of a pressure plate 2c.

Abstract: An oil supply device for an internal combustion engine includes: a variable displacement pump (1) that varies a discharge pressure at which oil is discharged; an oil passage (2) through which the oil discharged from the pump (1) flows; an oil filter (3) and an oil cooler (4) each of which is arranged in the oil passage (2); a bypass passage (5) connected to the oil passage (2) and bypassing the oil cooler (4); and a bypass valve (6) that opens and closes the bypass passage (5) according to a pressure of the oil. The bypass valve (6) is operated to control the flow of the oil through the oil cooler 4 as the discharge pressure of the pump (1) is adjusted according to operating conditions of the internal combustion engine.

Abstract: A seal arrangement for a vane cell pump of cartridge design which is configured such that it can be switched into multiple flows is described. The seal arrangement comprises a first seal which is arranged so as to run around the circumference of a side plate of the vane cell pump, and a second seal which is arranged so as to run around a shaft leadthrough which is provided in the side plate. The seal arrangement is distinguished by a third seal which, apart from at least one first fluid connection, shuts off at least a second fluid connection with respect to the at least one first fluid connection within a region which is configured between the first seal and the second seal.

Abstract: A pump insert without a dedicated housing includes a first pressure plate, a cam ring, a rotor, a second pressure plate, and radially displaceable vanes arranged in slots of the rotor and which run with a vane upper edge thereof engaging a contour of the cam ring during rotation of the rotor. The cam ring includes stagnation point protrusions which are configured as separate, moveable components fastened to the cam ring.

Abstract: A construction machine that can ensure an initial response that varies in accordance with a hydraulic actuator in a similar fashion to a case of adopting a hydraulic pilot-type operation device is provided. A controller 100 of a hydraulic excavator outputs a command current for driving the corresponding solenoid proportional valve (i.e. some of solenoid proportional valves 41a, 41b, 42a to 42d, 43a to 43d, 44a and 44b) in response to an operation signal from an electric lever-type work operation device 2a or 2b, and includes a correction function to correct the command current such that the command current is higher than a target current corresponding to an operation amount of the operation device for preset predetermined time at a time of starting to operate the operation device from a neutral position thereof. This correction function corrects only the command current to the bucket solenoid proportional valves 44a and 44b.

Abstract: The hydraulic control device includes: a mechanical variable-capacity oil pump; and an electronic control unit configured to calculate a target discharge volume of the mechanical variable-capacity oil pump using a plurality of parameters of the transmission, and control the mechanical variable-capacity oil pump based on the target discharge volume.

Abstract: A hydraulic radial piston device is provided with a mechanism for reducing pressure pulsations and providing a smooth pressure transition throughout different displacement operations. In certain examples, the hydraulic radial piston device is configured to maintain an amount of precompression and an amount of decompression of hydraulic fluid trapped in a cylinder chamber to be consistent, respectively, throughout different displacement operations.

Abstract: A method for operating a transmission (3) with a hydraulic system comprising a variable capacity hydraulic pump, the method comprising determining during operation, a current hydraulic fluid volume requirement for actuating the transmission (3) and for temperature controlling and lubricating components of the transmission (3); setting the delivery volume of the hydraulic pump in a manner dependent on the currently determined hydraulic fluid volume requirement of the transmission (3), the delivery volume of the hydraulic pump, provided for temperature controlling and lubricating the components, being guided at least partially through a heat exchanger; wherein the delivery volume of the hydraulic pump is varied in a manner dependent on a temperature of the hydraulic fluid to an extent which sets that part of the delivery volume flow of the hydraulic pump which is to be guided via the heat exchanger.

Abstract: Provided is a variable displacement vane pump with a control slide and a first and second control chambers. Also, the pump has a control system for controlling delivery of pressurized lubricant to the chambers. The control system includes a control device configured for movement between at least a first control position and a second control position. The control device may include its own housing and/or include discs configured for relative movement. The pivot pin may include grooves for delivering a flow from the outlet to the control system. In the first control position, pressurized lubricant is delivered to the first control chamber and the second control chamber is vented, which increases the output flow of the pump. In the second control position, pressurized lubricant is delivered to the second control chamber and the first control chamber is vented, which decreases the output flow of the pump.

Abstract: A variable lubricant vane pump which provides a pressurized lubricant for an engine includes a pump housing comprising a pump chamber. The pump chamber comprises pump compartments which rotate from a charge zone to a discharge zone. The pressurized lubricant is discharged from the pump compartments into an outlet cavity. A control ring envelopes the pump chamber and shifts between high and a low pumping volume position. A pump rotor comprises radially slidable vanes which rotate in the control ring. A pressure control chamber pushes the control ring into the high pumping volume direction. A control valve connects or disconnects the pressure control chamber to a lubricant tank. A pilot chamber pushes the control ring into the low pumping volume direction. A pilot chamber channel connects the outlet cavity with the pilot chamber. A control chamber channel connects the outlet cavity with the pressure control chamber.

Abstract: The invention proposes a vane pump (VP) with adjustable delivery volume, which vane pump has a pump housing (G), a cam ring (KR) arranged therein, and a rotor (R) which is rotatably movably mounted therein. The vane pump (VP) has a regulating device (RV) through which the delivered pressure medium (DM) flows and which has two outlets (A1, A2) which are each connected to one of two pressure chambers (DK1, DK2) in order to charge these with regulable proportions of the pressure medium (DM), wherein, to change the eccentricity of the cam ring (KR) relative to the rotor (R), the two pressure chambers (DK1, DK2) act on the outer surface of the cam ring (KR). The vane pump (VP) has two criss-crossing control ducts (STK*, STK#) which connect in each case one of the outlets (A1, A2) to one of the two pressure chambers (DK1, DK2) in order to charge these with the regulable proportions of the pressure medium (DM).

Abstract: A valve has a sleeve with at least one outlet port in a radially outer surface. A piston is moveable within the sleeve along an axis. The piston has a lip on a radially outer portion extending forwardly to an axially forward most end and a recess radially inward from the lip with respect to an axis of the piston. A vane pump is also disclosed.

Abstract: A lubricant pump comprises a shiftable control ring, a pump rotor rotating in the control ring, a pump outlet, and a pressure control system. The pressure control system comprises a pressure control chamber which pushes the control ring into a high pumping volume direction, an engine pressure input port connected to an engine pressure output port of an engine, a pilot chamber connected to the engine pressure input port which pushes the control ring into a low pumping volume direction, and a pressure control valve which controls a pressure in the pressure control chamber. The pressure control valve comprises a control valve plunger which opens/closes a control port to connect/disconnect the pressure control chamber to the atmospheric. The control valve plunger is fluidically connected to the engine pressure input port so that the control valve plunger is pushed by a lubricant pressure of the engine into an open position.

Abstract: A variable displacement vane pump includes first and second sealing grooves formed on an intake port side and separated away from each other in a circumferential direction; first and second sealing members provided in the first and second sealing grooves; a first fluid-pressure chamber formed on a side on which a volume thereof decreases when the cam ring moves to a side on which an eccentricity of the cam ring increases; and a second fluid-pressure chamber formed on a side on which a volume thereof increases when the cam ring moves to a side on which the eccentricity of the cam ring increases; and a control valve configured to control the pressure in the first or second fluid-pressure chamber.

Abstract: A variable displacement oil pump for an internal combustion engine includes a pump element to vary inside volumes of pumping chambers to suck and discharge an oil, a varying mechanism to vary a pumping volume variation quantity of the pumping chambers, with movement of a movable member such as a cam ring, an urging mechanism to urge the movable member in a direction to increase the pumping volume variation quantity, first and second control oil chambers to urge the movable member to vary the pumping volume variation quantity, and a control mechanism, such as a pilot valve, to control the supply/drainage of the oil to or from the second control oil chamber. An operation oil pressure of the movable member is set higher than an operation oil pressure of the control mechanism in a higher pressure region.

Abstract: A transmission device with a hydraulic system includes a pump device, a primary pressure circuit, and at least one additional pressure circuit supplied with hydraulic fluid by the pump device. The pump device is coupled to and driven by a transmission input shaft. A first pump unit of the pump device is connected to and driven by the transmission input shaft. A second pump unit of the pump device is connected to and driven by a transmission output shaft. A pressure side of the first pump unit is connected to the primary pressure circuit, and is connectable to the additional pressure circuit, while a pressure side of the second pump unit is connected to the additional pressure circuit, and is able to be coupled with the primary pressure circuit.

Abstract: A hydraulic system of a transmission having a controller and a variable displacement pump. The pump includes an inlet and outlet and is adapted to be driven by a torque-generating mechanism. The system also includes a lube circuit fluidly coupled to the pump. A lube regulator valve is disposed in the lube circuit, such that the lube regulator valve is configured to move between at least a regulated position and an unregulated position. The regulated position corresponds to a regulated pressure in the lube circuit. A pressure switch is fluidly coupled to the lube regulator valve and configured to move between a first position and a second position, where the switch is disposed in electrical communication with the controller. A solenoid is disposed in electrical communication with the controller and is controllably coupled to the pump to alter the displacement of the pump.

Abstract: There is provided a hydraulic circuit which can further improve a responsive characteristic in a pressure reducing operation and a reliability in the pressure reducing operation of a relief valve device, when a main circuit pressure exceeds a predetermined pressure.

Abstract: A variable displacement oil pump includes: a switching mechanism arranged to switch a state in which the hydraulic fluid is introduced to the second control hydraulic chamber through a connection passage, and a state in which the hydraulic fluid is discharged from the second control hydraulic chamber through the connection passage; and a control mechanism arranged to be actuated before the eccentric amount of the cam ring becomes minimum, and arranged to vary an opening area of the connection passage as the discharge pressure is increased, and to vary an opening area of a discharge passage arranged to discharge the hydraulic fluid within the second control hydraulic chamber, in a direction opposite to a direction of a variation of the opening area of the introduction passage.

Abstract: A vane pump includes a vane cam mounted in a recess of a rotor, and configured to move with eccentricity with respect to an axis of rotation of the rotor. A cam port is formed in a surface of a pump body facing the vane cam, and configured to hydraulically communicate with the recess of the rotor. The vane cam includes an outer peripheral surface configured to contact a proximal end of each of vanes, and configured to cause projection of the vanes along with rotation of the rotor. The vane cam hydraulically separates the proximal end portion of a first slot in a suction region from the proximal end portion of a second slot in a discharge region.

Abstract: A compressor may include a first scroll member, a second scroll member and a seal engaged with the second scroll member. The first scroll member may include a first end plate having a first spiral wrap extending therefrom. The second scroll member may be supported relative to the first scroll member and may include a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap. The second end plate may define a discharge port, bypass porting and a biasing passage. The biasing passage may be in communication with the bypass porting during a portion of a compression cycle of the compressor. The seal and the second scroll member may define an axial biasing chamber in communication with the biasing passage.

Abstract: A rotary compressor including two eccentric portions is provided. The rotary compressor includes: a casing; a cylinder provided within the casing and providing a compression space; a rotational shaft rotatably disposed with respect to the cylinder; a partition plate rotating together with the rotational shaft and dividing the compression space of the cylinder into first and second compression chambers disposed up and down; first and second eccentric portions provided in upper and lower portions of the partition plate and being eccentric in different directions with respect to a rotation center of the rotational shaft so as to rotate together with the rotational shaft; and a driving motor rotatably driving the rotational shaft.

Abstract: Disclosed are a bush bearing, a fabricating method thereof and a hermetic compressor having the same. A lubricant member of the bush bearing can be adhered onto a housing or press-fitted therein so as to remarkably increase the thickness of the lubricant member, whereby the bush bearing can be more resistant to abrasion, and upon applying the same to the compressor, abrasion of a crank shaft or the bush bearing can be reduced.

Abstract: An integrated control valve body and hydraulic pump for an automatic transmission includes a control valve body having a plurality of control valves and passageways and an internal cavity having an inlet and an outlet, a pump rotor received within the internal cavity and having a plurality of radially and axially extending slots, radially moveable vanes and a shaft, and a device for transferring drive energy from a drive shaft extending between an output of a torque converter and an input of the transmission to the shaft of the hydraulic pump. The device for transferring drive energy may be a pair of chain sprockets and a chain, a pair of spur or helical gears or other inter-axis power transfer components and may affect a speed increase or reduction.

Abstract: A variable displacement lubricant pump includes a first plunger which pushes a shiftable control ring into a high pumping volume direction. A pump rotor comprises radially slidable vanes which rotate in the control ring. A pressure control system comprises a first pressure control chamber wherein a first plunger is axially moveable. A first pressure conduit connects a pump outlet port with the first pressure control chamber. A first pressure control valve controls a pressure in the first pressure control chamber. A second pressure control valve between an outlet opening in a side wall of the first pressure control chamber and a low pressure source controls the outlet opening and is a centrifugal valve mechanically connected with the pump rotor which closes at a high rotational speed of the pump rotor. The outlet opening is closed by the first plunger in a low pumping volume position and opened in a high pumping volume position.

Abstract: A variable displacement pump includes: a discharge opening formed at a position to confront a discharge region; a back pressure introduction groove formed on the suction region side; and a discharge side thin wall portion which is formed in the second housing, which has a recessed shape opened to the outside, which is disposed on the discharge region side, which is overlapped with the rotor in the radial direction, and which includes a smallest thickness portion having a smallest wall thickness of thicknesses each of which is an axial length between a bottom surface of the recessed shape and an axially inner side surface of the second housing, the smallest wall thickness being a smallest wall thickness of axial thicknesses of the second housing.

Abstract: A lubricant pump system may include a lubricant pump controlled by a proportional valve. An actuating unit may be disposed in the lubricant pump and configured to control a delivery output of the lubricant pump. A first pressure chamber and at least one second pressure chamber may be configured to adjust the actuating unit against a spring, wherein the second pressure chamber is smaller than the first pressure chamber. In response to a failure of the proportional valve, the lubricant pump may be exclusively pressurized via the at least one second pressure chamber.

Abstract: A unified variable displacement pump having a housing which includes a fluid pump and a vacuum pump. A portion of the housing is part of the fluid pump, and a portion of the housing is part of the vacuum pump. A shaft extends through the fluid pump and the vacuum pump. A vacuum pump rotor is formed as part of the shaft, and a vane pump rotor is mounted to the shaft such that when the shaft rotates, the vacuum pump rotor and the vane pump rotor rotate, causing the fluid pump to pump fluid and the vacuum pump to generate a vacuum. The vacuum pump and fluid pump are combined into a single component driven by a single shaft.

Abstract: A rotary pump with an improved seal on a control pressure chamber, including: a housing having a delivery chamber; a feed wheel rotatable in the delivery chamber; an actuating member surrounding the feed wheel forming delivery cells and moveable in the housing relative to the feed wheel. The control pressure chamber is delineated by the actuating member together with axially facing axial co-operating surfaces, forming an axial sealing gap and a radial sealing gap. A control fluid can be introduced into the control pressure chamber for applying pressure to the actuating member to exert an actuating force in the actuating direction; a restoring device for generating a restoring force; and a sealing element arranged on the actuating member or the circumferential co-operating surface. To compensate for a change in gap width of one of the axial sealing gaps, a base leakage cross-section is provided on the sealing element.

Abstract: An adjustable vane cell pump is provided having a rotor, which includes, but is not limited to bearing slots extending in radial direction, in which cane plates displaceable relative to the bearing slots are arranged. The vane cell pump further includes, but is not limited to an adjustable slide having a substantially cylindrical inner surface. The rotor is configured in order to driveably rotate about a rotary axis within the slide. The vane plates bear against the inner surface of the slide, and the slide further includes, but is not limited to a first and a second areal end face, as well as recesses, which outer-circumferentially extend parallel to the end faces.

Abstract: An oil pump includes a capacity adjustment mechanism that changes the pump capacity by moving a tubular body in a tube radial direction, with a pump chamber formed between the tubular body and an outer circumference side of a rotor, a first spring biasing the tubular body in a direction in which pump capacity increases, a control valve that converts oil pressure of the oil pump into control pressure and causes the control pressure to act on the capacity adjustment mechanism, and a second spring biasing a valve body in order to set the control pressure in the control valve. The relationship of the biasing forces of the first and second springs is set so that pump capacity is set to maximum when the engine rotational speed is less than a predetermined value, and so that pump capacity is reduced when the engine rotational speed exceeds a predetermined value.

Abstract: A variable displacement oil pump for an automotive engine. The oil pump includes a cam ring accommodating thereinside a pump element having a rotor. The cam ring is swingingly movably accommodated in a housing and biased in a direction to increase an eccentricity amount of the cam ring relative to the axis of the rotor by a biasing member. First and second pressure chambers are defined inside the housing by the outer peripheral section of the cam ring. The first pressure chamber is supplied with a discharge pressure to be applied to the cam ring to oppose to a biasing force of the biasing member. The second pressure chamber is supplied with the discharge pressure to be applied to the cam ring to assist the biasing force of the biasing member. Additionally, a control device is provided for controlling supply of the discharge pressure to the second pressure chamber.

Abstract: A variable capacity vane includes a pump control ring which is moveable to alter the capacity of the pump and the pump can be operated at either of at least two selected equilibrium pressures. The pump ring is moved by at least first and second control chambers, the control chambers abutting the control ring such that pressurized fluid supplied to them acts on the pump control ring to move the pump control ring to reduce the volumetric capacity of the pump. When pressurized fluid is supplied to only one control chamber, the pump operates at a first equilibrium pressure and when pressurized fluid is also supplied to the second chamber, the pump operates at a second equilibrium pressure. Pressurized fluid can also be supplied only to the second control chamber to operate the pump at a third equilibrium pressure and/or additional control chambers can be provided if required.

Abstract: According to one aspect, a vehicle control system. The control system includes a steering control coupled to at least one steerable wheel, the steering control having a first position, a second position and a plurality of positions therebetween. The control system also includes a steering sensor coupled to the steering control and configured to generate steering sensor signals based upon the position of the steering control. The control system also includes a control module coupled to the steering sensor, the control module configured to (i) record a first steering sensor signal value when the steering control is in the first position; (ii) record a second steering sensor signal value when the steering control is in the second position; and (iii) determine a current position of the steering control by comparing the first and second steering sensor signal values with a current steering sensor signal value.

Abstract: A pumping system having a pump, such as a variable-displacement vane pump or a gear pump. The pump in turn has hydraulic pressure-control dissipating devices for imparting to the oil in a first control chamber a pressure lower than the pressure of a second chamber. The system is characterized in that the first control chamber of the pump has a channel connecting the first control chamber to an oil inlet. And the channel has an opening/closing device controlled selectively by an engine operating parameter, such as oil temperature.

Abstract: A variable displacement vane pump includes, but is not limited to inlet and outlet ports in a pump body, a drive shaft rotatably mounted in the pump body, a rotor driven by the drive shaft and radially extending vanes slidably disposed in the rotor. A slide is pivotally disposed on a pivot and has a central axis eccentric to the axis of the rotor. Chambers are defined by the rotor, the vanes and the slide that are successively connected to the inlet and outlet ports. A resilient member is pivotally engaged with the slide and acts on the slide to urge the slide in one direction.

Abstract: A lubrication system for a power transmission device includes a variable displacement vane pump including a moveable control ring for varying the displacement of the pump. A linear actuator directly acts on the control ring for moving the control ring between maximum and minimum pump displacement positions. The linear actuator includes an electric motor for rotating a drive member. The drive member engages a driven actuator shaft to cause linear translation of the actuator shaft in response to rotation of the drive member. A control system includes a controller for signaling the actuator to extend or retract the actuator shaft to vary the pump displacement.

Abstract: A variable capacity vane pump has a plurality of vanes radially extendably installed in their respective slots that are arranged in a circumferential direction in a rotor, a cam ring rockably provided on a supporting surface in a pump body and forming a plurality of pump chambers at an inner circumference side of the cam ring in cooperation with the rotor and the vanes, and a seal member provided at an outer circumference side of the cam ring and defining a first hydraulic pressure chamber located at a side where a pump discharge amount increases and a second hydraulic pressure chamber located at a side where the pump discharge amount decreases in a space outside the outer circumference of the cam ring. A center of the cam ring is offset to an inlet port side from a center of a driving shaft.

Abstract: Variable displacement oil pump includes a: rotor; vanes; cam ring; housing; biasing member biasing the cam ring in a direction enlarging an eccentricity between centers of the rotor and inner circumferential surface of the cam ring; a contact surface to contact with a cam ring outer circumferential surface via a biasing force applied to the cam ring by the biasing member; a control chamber separately formed by the contact surface and a swing fulcrum of the cam ring on a cam ring outer circumference when the contact surface contacts the cam ring outer circumferential surface, and causing the cam ring to swing against the biasing force of the biasing member by a pressure from a discharge portion to the control chamber; and a choking portion formed on the outer circumferential surface of the cam ring to maintain a pressure of the control chamber even when the cam ring swings.

Abstract: A fuel control system (100) for supplying metered fuel flow to a gas turbine engine is disclosed that includes a variable delivery fuel pump (116) for outputting a fuel flow that includes a burn fuel flow for the gas turbine engine and a surplus fuel flow recirculated back to an inlet (124) of the variable delivery fuel pump (116) and a pump control (148, 158, 122) for controlling the output of the variable delivery fuel pump to maintain the surplus fuel flow at a substantially constant rate. A method of controlling a fuel system (100) is also disclosed.

Abstract: The present invention is a variable displacement pump system for delivering precisely controlled oil flow and pressure, including a variable displacement pump having an inlet passage, an outlet passage, a first chamber and a second chamber for controlling the displacement of the variable displacement pump. The present invention also includes a fluid control device for receiving fluid from the outlet passage, and selectively delivering fluid to the second chamber. Fluid is delivered from the inlet passage to the outlet passage from the variable displacement pump, and fluid is also delivered from the outlet passage to the first chamber and the fluid control device. When fluid pressure is greater in the first chamber relative to the second chamber, the displacement of the variable displacement pump will decrease, and when fluid pressure is greater in the second chamber relative to the first chamber, the displacement of the variable displacement pump will increase.

Abstract: A variable displacement variable pressure vane pump system provides lubrication oil to a mechanical system. The pump system includes a first control mechanism to apply a force to a control slider to counter a biasing force of a biasing spring and urge the control slider away from a position corresponding to a maximum displacement position of the pump. A second control mechanism applies a force to the control slider to alter the displacement of the pump. A control varies the supply of lubrication oil to the second control mechanism to alter the output of the pump to closely correspond to the lubrication requirements of the mechanical system.