| 摘要 |
PCT No. PCT/FR93/01068 Sec. 371 Date Nov. 4, 1993 Sec. 102(e) Date Nov. 4, 1993 PCT Filed Oct. 29, 1993 PCT Pub. No. WO94/12378 PCT Pub. Date Jun. 9, 1994.The invention relates to a motor vehicle pneumatic brake booster, comprising a casing (10) inside which a piston (20) formed from a rear tubular part (22) supporting a skirt (14) defines, with the aid of an unrolling membrane (12), a front chamber (16), permanently connected to a vacuum source and a back chamber (18) alternately connected to the front chamber (16) or to the atmosphere via a valve (40) actuated by a control rod (34) capable of bearing, by a plunger (32), on one of the faces of a reaction disk (58) securely fastened to a thrust rod (56), the valve comprising a valve element interacting via an active part (40) with a first valve seat (32a) formed on the plunger (32) and a second valve seat (20a) formed on the piston (20), the valve element (40) normally being stressed forward by an elastic element (44). According to the invention, actuation apparatus (60, 100, 160) are provided in order to stress the active part of the valve element (40) forward in simultaneous interaction with the first (32a) and second (20a) valve seats.
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