Patent ID: 6789657
Filing Date: 2004-09-14
Classification: F16H

Abstract:
A clutch pack actuation system which can compress an annular clutch pack of a limited slip differential comprising:a pump which can provide a supply of pressurized fluid, an annular member provided between the pump and the annular clutch pack, an annular piston which is slidable within the annular member and which, together with the annular member, defines a clutch pressure chamber adapted to receive the supply of pressurized fluid, a fluid return line by which the pressurized fluid is discharged from the clutch pressure chamber, and a valve, through which the pressurized fluid is returned to a fluid reservoir, disposed in the fluid return line, wherein the valve includes an element which is electromagnetically actuated so as to produce a desired pressure in the clutch pressure chamber, and a force produced by electromagnetic actuation of the element opposes a force produced on the element by the pressurized fluid.