| 摘要 |
A vacuum brake booster (10) is described, comprising a vacuum chamber (16) and a working chamber (18) separated from each other by a movable wall (14). The vacuum brake booster (10) includes an emergency braking aid comprising a permanent magnet (38), which is disposed in the control valve housing (22), and an armature (36A) which cooperates with the permanent magnet (38) and in the event of emergency braking is drawn into abutment with the permanent magnet (38), with the result that a control valve (20) is held open for the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18). The permanent magnet (38) and the armature (36A) form a two-component magnetic module (36A, 38), of which a first component is rigidly coupled to an actuating piston (28) of the brake booster (10). A coupling device (66) is provided which is adapted to couple the second component of the magnetic module (36A, 38), at least in actuating direction, to the actuating piston (28) in response to high reaction forces. |
