Abstract: A variable capacity vane pump is provided, the pump having 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. If desired, 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: A variable capacity gerotor pump includes an inner rotor that is axially displaceable with respect to the outer rotor to vary the volumetric capacity of the pump. An active piston abuts the lower surface of the inner rotor and can ride inside the outer rotor, as the inner rotor is axially displaced, to provide the necessary scaling of the lower surface of the inner rotor with respect to the outer rotor. A passive piston, against which a return spring acts, abuts the upper surface of the inner rotor to provide the necessary sealing of the upper surface of the inner rotor with respect to the outer rotor. In an embodiment, a control chamber, supplied with pressurized working fluid, generates a force acting against the force of the return spring to move the inner rotor to reduce the volumetric capacity of the pump. In another embodiment, a control mechanism, such as an electric solenoid or mechanical mechanism, acts on the control piston against the force of the return spring.

Abstract: A variable capacity vane pump includes a pump casing having a pump chamber with an inlet and an outlet port. A pump control ring is moveable within the pump chamber to alter the capacity of the pump. A vane pump rotor is rotatably mounted within the pump control ring and includes a plurality of slidably mounted vanes engaging the inside surface of the pump control ring. First and second control chambers between the pump casing and the pump control ring are operable to receive pressurized fluid to urge the pump control ring to reduce the volumetric capacity of the pump. A return spring biases the pump ring toward a position of maximum volumetric capacity against the force of the first and second control chambers to establish an equilibrium pressure. The supply of pressurized fluid to the second control chamber may be varied to change the equilibrium pressure of the pump.

Abstract: A pump system includes pump having a control feature which, responsive to a supply of pressurized working fluid, reduces the pressure of the working fluid pressurized by the pump. The control feature is connected to the output of the pump by a regulating valve. The control feature receives pressurized working fluid to decrease the output of the pump in response to the pressure of the supplied working fluid. A regulating valve selectively connects the pressurized working fluid to the control feature. The regulating valve has a control port to receive pressurized working fluid from the pump to urge the valve to a closed position against a biasing force. A controllable valve is operable to interrupt the supply of pressurized working fluid to control port to alter the output pressure of the pump.

Abstract: In a traditional variable-displacement vane pump, at lower speeds the pump will often operate at a higher capacity than necessary for that speed, thus wasting energy. A variable capacity vane pump (20) is provided having a pump control ring (44) that is moveable to alter the capacity of the pump (20). A control chamber (60) is formed between the pump casing (22) and the control ring (44). The control chamber (60) is operable to receive pressurized fluid to create a force to move the control ring (44) to reduce the volumetric capacity of the pump (20). A primary return spring (56) acts between the control ring (44) and the casing (22) to bias the control ring (44) towards a position of maximum volumetric capacity. A secondary return spring (62) is mounted in the casing (22) and is configured to engage the control ring (44) after the control ring (44) has moved a predetermined amount. The secondary return spring (62) biases the control ring (44) towards a position of maximum volumetric capacity.

Abstract: A variable displacement vane pump which includes an enhanced discharge port. The enhanced discharge port reduces areas of high pressure in the discharge port which would otherwise occur as the pressurized working fluid reverses its direction of flow to enter the discharge port. By reducing the areas of high pressure, the back torque on the pump rotor is reduced and the energy efficiency of the pump is enhanced. In one embodiment, the pivot for the pump control ring is located radially outwardly from a conventional location, to allow for a discharge recess to be formed in the control ring, adjacent the discharge port, and extending past the pivot to the pump outlet. In a second embodiment, the discharge recess is formed in the control ring around the pivot and a seal is provided on the control ring to inhibit leakage of pressurized working fluid past the control ring.

Abstract: A vane pump with a reduced rotor diameter is provided. The reduced rotor diameter allows a reduction in the overall size of the pump which allows the pump to be used in circumstances wherein sufficient packaging volume does not exist for conventional vane pumps. Further, the reduced rotor diameter permits operation of the pump at a higher speed, in comparison to conventional vane pumps, for a given working fluid and pump rate. The rotor includes an integrally formed drive shaft and a cylindrical rotor head. Both fixed displacment and variable displacement embodiments are shown.

Abstract: Embodiments of the invention address the problem of removing malicious code from infected computers.

Abstract: A variable capacity vane pump is provided, the pump having 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. If desired, 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: A dynamic balancer for a prime mover, such as an internal combustion engine, with at least one balance shaft driven by the crankshaft of the engine, the at least one balance shaft. The pressure generator creates an output signal of pressurized working fluid whose pressure is speed-related. In one embodiment, the speed related pressure signal is applied to a device outside the balancer via a suitable the invention, a working fluid pump is also driven by at least one of the balance shafts of the dynamic balancer and the speed-related pressure signal is applied to the working fluid pump to control its output.

Abstract: A pump system for supplying pressurized hydraulic fluid to a hydraulic valve actuation system for operating engine valves of an internal combustion engine comprises a conventional pump, driven by the engine, which supplies the necessary volume of pressurized hydraulic fluid when the engine is running. The system further comprises a booster pump which is driven by the starter motor of the engine and which supplies the necessary volume of hydraulic fluid during starting/cranking of the engine. The conventional pump is preferably designed and constructed for operating efficiency during engine operating conditions while the booster pump is preferably designed and constructed for operating efficiency during cranking/starting of the engine.

Abstract: A pump system for supplying pressurized hydraulic fluid to a hydraulic valve actuation system for operating engine valves of an internal combustion engine comprises a substantially conventional main pump, driven by the engine, which supplies the necessary volume of pressurized hydraulic fluid when the engine is running. The system comprises a booster pump that supplies in conjunction with the main pump the necessary volume of hydraulic fluid during starting/cranking of the engine. The main pump is preferably designed and constructed for operating efficiency during engine operating conditions while the booster pump is preferably designed and constructed for operating efficiency during cranking/starting of the engine.

Abstract: A variable displacement vane pump is provided which is able to achieve a substantially constant output pressure in its regulated operation region. The longitudinal axis of the control spring of the pump is inclined, with respect to a plane through the rotational axis of the pivot and the contact point between the control ring and the control spring, and this inclination results in a reduction in the length of the moment arm between the spring and the pivot when the control ring of the pump is moved from the maximum displacement position to the minimum displacement position. By reducing the length of this moment arm, the increase in the moment produced by compression of the control spring is offset, resulting in a substantially constant output pressure in the regulated operating range of the pump. The inclination further results in a reduction in the amount by which the control spring is compressed when the control ring moves from the first position to the second position.

Abstract: A variable capacity gerotor pump includes an inner rotor that is axially displaceable with respect to the outer rotor to vary the volumetric capacity of the pump. An active piston abuts the lower surface of the inner rotor and can ride inside the outer rotor, as the inner rotor is axially displaced, to provide the necessary scaling of the lower surface of the inner rotor with respect to the outer rotor. A passive piston, against which a return spring acts, abuts the upper surface of the inner rotor to provide the necessary sealing of the upper surface of the inner rotor with respect to the outer rotor. In an embodiment, a control chamber, supplied with pressurized working fluid, generates a force acting against the force of the return spring to move the inner rotor to reduce the volumetric capacity of the pump. In another embodiment, a control mechanism, such as an electric solenoid or mechanical mechanism, acts on the control piston against the force of the return spring.

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

Abstract: A pump system includes a fixed or variable capacity pump and a speed-related control mechanism to alter the capacity of a variable capacity pump or to alter the relief pressure of a fixed capacity pump in response to changes in the operating speed of the pump. A pressure generator comprising a volume of working fluid is rotated at a speed related to the operating speed of the pump and creates a forced vortex in the working fluid. The pressure induced in the working fluid of the forced vortex is used as a speed related control to alter the discharge pressure of the pump as desired.

Abstract: Batteryless noise canceling headphones include a first earpiece having a first speaker for providing a first audio output to a first ear of a user in response to a first audio output signal, and having a first microphone element for converting a first ambient audio input at the first ear into a first ambient audio input signal in response to a bias voltage. A connector receives the bias voltage from an audio device, receives the first audio output signal from the audio device, and provides the first ambient audio signal to the audio device.

Abstract: Embodiments of the invention address the problem of removing malicious code from infected computers.

Abstract: Embodiments of the invention address the problem of removing malicious code from infected computers.

Abstract: A system and method to provide voltage to a device from the operating mode of an integrated circuit is disclosed. In a particular embodiment, the disclosed system includes an integrated circuit having an input/output pin and a DC-DC converter circuit that is coupled to the input/output pin and including a transistor element. The DC-DC converter circuit has a first mode of operation and a second mode of operation. In the first mode of operation, the DC-DC converter circuit performs voltage conversion and in the second mode of operation, the transistor element of the DC-DC converter circuit is used to selectively apply a voltage supply to an external module coupled to the input/output pin.