Patent ID: 7404292
Filing Date: 2008-07-29
Classification: F15B,F16D,Y10T

Abstract:
1. A hydraulic system comprising: a master cylinder; a slave cylinder; a pressure medium line connecting the master cylinder to the slave cylinder; a motor driven pump situated in the pressure medium line and having an inlet and an outlet; and a valve situated in the pressure medium line, the valve having a first valve position where the master cylinder and the slave cylinder are connected directly to one another and a second valve position where the master cylinder and the slave cylinder are connected to one another via the pump, wherein the valve includes at least one first connection on a master cylinder end and a second connection on a slave cylinder end, a piston axially movable in a housing, the piston having an end face in an operative hydraulic connection with the first connection on the master cylinder end and has a back face opposite the end face, and a spring situated on the back face exerting a force in the direction of the end face on the piston, both the piston and the housing having connecting channels forming valve connections which open and close with axial movement of the piston, wherein the connecting channels are ring grooves on an outside surface of the piston and an inside surface of the housing.