| Patent application number | Description | Published |
|---|
| 20090101092 | VARIABLE DISPLACEMENT PUMP, VALVE TIMING CONTROL DEVICE USING THE VARIABLE DISPLACEMENT PUMP, AND VALVE TIMING CONTROL SYSTEM USING THE VARIABLE DISPLACEMENT PUMP, FOR USE IN INTERNAL COMBUSTION ENGINES - A variable displacement pump including a chamber volume varying mechanism including a moveable member, a first biasing member always biasing the moveable member in such a direction as to increase volumes of the working fluid chambers, and a second biasing member that is disposed with a set load and applies a biasing force to the moveable member in such a direction as to increase the volumes of the working fluid chambers when the moveable member is displaced against a biasing force of the first biasing member by a predetermined amount or more. The biasing force of the first biasing member is set such that before the moveable member is displaced against the biasing force of the first biasing member, the valve timing control device is shifted to a release state in which an open-and-closure timing of an engine valve is variably controlled. | 04-23-2009 |
| 20090291000 | VARIABLE DISPLACEMENT VANE PUMP - In a variable displacement vane pump employing a cam ring, a pump rotor, and a plurality of vanes, each slidably fitted into the rotor, a biasing member is provided to force the cam ring in a direction that a geometric center of an inner peripheral surface of the cam ring and a rotation center of the rotor are spaced apart from each other. A force, by which the cam ring can be oscillated against the biasing member in accordance with a buildup of a pressure in a pump discharge portion, acts on the inner peripheral surface of the cam ring. | 11-26-2009 |
| 20100226799 | VARIABLE DISPLACEMENT PUMP - 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. | 09-09-2010 |
| 20100232989 | VARIABLE DISPLACEMENT OIL PUMP - A variable displacement oil pump includes a rotor; a plurality of vanes; a cam ring; a housing; a biasing member configured to biases the cam ring in a direction that enlarges an eccentricity between a rotation center of the rotor and a center of inner circumferential surface of the cam ring; a contact surface configured to become in contact with an outer circumferential surface of the cam ring by means of 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 an outer circumference of the cam ring when the contact surface is in contact with the outer circumferential surface of the cam ring, and configured to cause the cam ring to swing against the biasing force of the biasing member by a pressure introduced from a discharge portion to the control chamber; and a choking portion formed on the outer circumferential surface of the cam ring so as to maintain a pressure of the control chamber even when the cam ring swings. | 09-16-2010 |
| 20110085921 | Apparatus Having Control Valve and Variable Capacitance Pump and Hydraulic Pressure Circuit of Internal Combustion Engine in which the Same Apparatus is Used - In a hydraulic pressure circuit including an introduction section through which oil is introduced, a main passage section installed at a downstream side of the introduction section to be communicated with a supply section through which oil is supplied to each of slide sections of an internal combustion engine, a branch passage branched from the main passage section to supply oil to a hydraulic pressure actuator, and a control valve having a valve body which is moved in accordance with a pressure of an upstream side thereof, and a variable capacitance pump configured to drain oil to the introduction section, the variable capacitance pump is configured to vary a drained flow quantity in accordance with the drained pressure of oil and a pressure under which the oil drained flow quantity is started to be varied is higher than a pressure under which the valve body is started to move. | 04-14-2011 |
| 20110123379 | VARIABLE DISPLACEMENT PUMP - A variable displacement pump includes a pump structural member configured to change volumes of a plurality of working chambers by rotation of a rotor, so as to introduce oil through an inlet port into the working chambers and to discharge the oil through a discharge port, and further configured to oscillate a cam ring by a discharge pressure introduced into a control oil chamber. A first coil spring is provided to force the cam ring in a direction for increasing of a rate of change of the working-chamber volume. A second coil spring is provided to force the cam ring in a direction for decreasing of the rate of change of the working-chamber volume. The first and second coil springs are laid out on both sides of an arm portion of the cam ring in a manner so as to be opposed to each other. | 05-26-2011 |
| 20110189043 | VANE PUMP - A vane pump in which oil is drawn from at least one side, in an axial direction, of a cam ring and is discharged from at least one side, in the axial direction, of the cam ring, has a portion defined by a groove formed on an inner circumference surface of the cam ring. The groove extends along a circumferential direction of the inner circumference surface of the cam ring and is arranged in a position including a middle of an axial direction width on the inner circumference surface. The groove is arranged in an oil suction section or an oil discharge section of the cam ring. | 08-04-2011 |
| 20110194967 | VARIABLE DISPLACEMENT PUMP, OIL JET AND LUBLICATING SYSTEM USING VARIABLE DISPLACEMENT PUMP - A variable displacement pump arranged to supply a hydraulic fluid to an oil jet arranged to inject the hydraulic fluid to a piston of an internal combustion engine, the variable displacement pump includes: a pump constituting section arranged to be driven and rotated by the internal combustion engine, and thereby to discharge the hydraulic fluid; a movable member arranged to decrease the flow rate discharged from the discharge portion by moving in one direction; a control section configured to move the movable member in the one direction by a predetermined amount when the discharge pressure becomes a first discharge pressure, and to further move the movable member in the one direction when the discharge pressure becomes a second discharge pressure larger than the first discharge pressure, the first discharge pressure being set smaller than the predetermined pressure at which the oil jet starts to inject the hydraulic fluid. | 08-11-2011 |
