Patent ID: 6705200
Filing Date: 2004-03-16
Classification: B60T

Abstract:
Vacuum brake booster, comprisinga vacuum chamber and a working chamber separated in a pressure-proof manner from one another by a movable wall, a control valve, which comprises a housing workingly coupled to the movable wall and containing a valve seat, which to achieve a pressure difference at the movable wall is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber in dependence upon the displacement of an input element of the brake booster, an emergency braking aid comprising a permanent magnet and an armature, which cooperates with the permanent magnet and is spring-biased counter to the actuating direction and during an emergency braking operation is pulled 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, for adjusting the distance between the armature and the permanent magnet, at least one of the axial position of the permanent magnet relative to the control valve housing and the distance between the armature and the valve seat is adjustable.