Patent ID: 6681680
Filing Date: 2004-01-27
Classification: B60T

Abstract:
A brake booster, comprisinga vacuum chamber and a working chamber separated from each other by a movable wall, a control valve, which comprises a control valve housing coupled workingly to the movable wall and which is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber to achieve a pressure difference at the movable wall, an emergency braking aid comprising a permanent magnet disposed in the control valve housing, and an armature, which cooperates with the permanent magnet and in the event of emergency braking is drawn into abutment with the permanent magnet, with the result that the control valve is held open for the supply of atmospheric pressure or above-atmospheric pressure to the working chamber, wherein the permanent magnet and the armature form a two-component magnetic module, of which a first component is coupled to an actuating piston in actuating direction of the brake booster, and a coupling device for coupling the second component of the magnetic module at least in the actuating direction of the brake booster, to the actuating piston, wherein reaction forces acting counter to the actuating direction of the brake booster are introduced into the coupling device at least in non-emergency braking situations, to cause coupling of the second component of the magnetic module, at least in actuating direction of the brake booster, to the actuating piston.