| 摘要 |
PCT No. PCT/EP97/01454 Sec. 371 Date Apr. 5, 1999 Sec. 102(e) Date Apr. 5, 1999 PCT Filed Mar. 21, 1997 PCT Pub. No. WO97/35754 PCT Pub. Date Oct. 2, 1997The present invention discloses a brake force booster for automotive vehicles having a control valve which is operable independently of an actuating rod displacing a valve piston, by way of an electromagnet which actuates a third sealing seat. Displacement of the sealing seat in opposition to the actuating direction of the brake force booster permits ventilating the working chamber. To eliminate all pneumatically induced force components in an independent activation, according to the present invention, a permanent pneumatic connection is provided between a pneumatic chamber delimited in the control housing by the valve member and the vacuum chamber, and in that both a second sealing seat which is provided on the valve piston and used to ventilate the working chamber, the third sealing seat, and the valve member in its sealing lip delimiting the pneumatic chamber in the control housing have almost identical diameters.
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