Patent ID: 6623087
Filing Date: 2003-09-23
Classification: B60T,Y10S

Abstract:
An actuating unit for a wheel brake of a motor vehicle, comprising a pressure fluid storage tank in an electric motor; a hydraulic pump as a sole component for pressure generation, said hydraulic pump being drivable at variable speeds by said electric motor and supplying pressure fluid from said storage tanks; an electrically controllable element provided for adjusting a return flow of pressure fluid and disposed between a pressure side and a suction side of said pump; a cylinder-piston unit connected to the pressure side of said pump and pressing at least one brake lining against and also lifting away the at least one brake lining from a friction element connected to a vehicle wheel; a control unit operative for processing electric brake request signals and slip signals and variably controlling said electric motor and said element; an electromagnetic pressure increase valve disposed in a first line connected to only said pump as a pressure source and extending between said pressure side of said pump and said cylinder-piston unit; and an electromagnetic pressure decrease valve disposed in a second line extending between said cylinder-piston unit and said suction side of said pump, said control unit, depending on slip, switching said valves into positions for pressure increase, pressure maintenance and pressure decrease, said pressure fluid storage tank being disposed between said pressure decrease valve and said suction side of said pump.