| Patent Number |
Title Of Patent |
Date Issued |
| 7559336 |
Pressure limiting valve |
July 14, 2009 |
| A pressure limiting valve having a spool with raised spool lands. The spool is slidably received in a spool bore having inflow and outflow grooves that form control edges. The valve has two control edges, and a hydraulic resistance is connected in series with one of the control edges |
| 7552929 |
Active roll stabilization apparatus |
June 30, 2009 |
| Apparatus for the active stabilization of the rolling of a vehicle that has at least two axles that each have at least two wheels. The axles are each equipped with a transverse stabilizer that is hydraulically actuated by a directional control valve. The transverse stabilizers are operat |
| 7540299 |
Apparatus and method for cooling a clutch of a motor vehicle |
June 2, 2009 |
| A method and apparatus for cooling a clutch of a motor vehicle by controlling a valve through which a coolant circuit is coupled with a pump circuit. The valve includes a control piston that is movable at least to actuate a connection between the coolant circuit and the pump circuit. |
| 7493203 |
Methods for regulating the gear ratio of an automatic power-branched transmission, and automatic |
February 17, 2009 |
| A method for regulating or controlling the transmission ratio of an automatic power-branched transmission. Power is transmitted through a shaft driven by an engine, a variable speed drive, a gear transmission, a driven shaft, and at least two control clutches. The variable speed drive |
| 7418885 |
Device for driving a plurality of hydraulic shift cylinders and hydraulic supply system for a tw |
September 2, 2008 |
| A device for driving a plurality of hydraulic shift cylinders, especially shift cylinders for shifting gears of a twin-clutch transmission, includes a first slide valve having a control intake to which control pressure is applied, a system pressure intake to which system pressure is |
| 7389640 |
Hydraulic system and automatic transmission |
June 24, 2008 |
| A hydraulic system including a multi-flow hydraulic pressure supply unit, especially a dual-flow hydraulic pressure supply unit, such as a pump, by which a volumetric flow of pressurized fluid is supplied to a hydraulic-fluid-operated device. A valve arrangement is provided either fo |
| 7318594 |
Active roll stabilization system |
January 15, 2008 |
| An active roll stabilization system of a vehicle having an axle with at least two wheels, wherein the axle is provided with a roll stabilizer that is actuated by means of a hydraulic device. The hydraulic device is actuated and controlled by at least one pressure control valve with a |
| 7234579 |
Multiple clutch assembly |
June 26, 2007 |
| A multiple clutch assembly for use in the power train of a motor vehicle between a prime mover and a change-speed transmission. A hub is coupled to a pumping device for an operating fluid. The pumping device is located radially outwardly of two coaxial, interfitted input shafts of the |
| 6477446 |
Method of and apparatus for controlling the operation of a fluid pressure regulating valve |
November 5, 2002 |
| A fluid pressure regulating valve, particularly for an automated clutch in the power train of a motor vehicle with a manually shiftable transmission, is adjustable by an electronic control unit which regulates the strength of alternating current being supplied to one or more electromagne |
| 6470909 |
Hydraulic system |
October 29, 2002 |
| A hydraulic system for a motor vehicle has at least one pressure restricting valve with a housing that has two or more connections. At least one conduit cross-section in the housing can be closed by means of a closing body that is movable axially against the action of an energy accum |
| 6296019 |
Pressure medium system |
October 2, 2001 |
| The invention relates to a pressure medium system with at least one valve and one pressure medium supply, whereby a differential pressure can be purposely controlled in a positive and negative pressure area, especially for controlling a torque converter lockup clutch of a hydrodynamic to |
| 6170508 |
Fluid flow regulating valve and method |
January 9, 2001 |
| A valve for regulating the rate of flow and/or the pressure of oil flowing to a transmission or another consumer in the power train of a motor vehicle has a piston which defines with the valve housing a chamber for one or more springs and for oil being admitted through a first inlet by |
