| 摘要 |
The invention relates to a pneumatic brake booster for a motor vehicle of the type that comprises a rigid casing containing a moveable transverse wall which is linked to a piston (22) and which comprises a more or less bell-shaped front element (36), one internal cylindrical surface (38) of which partially surrounds the piston (22). The bell-shaped element is covered with a rear elastomer membrane ring (40). One inner edge (46) of said ring is shaped into a flange which extends forward into a groove (48) of the piston (22) and which is partially held in said position by means of the internal cylindrical surface (38) of the front element (36) which extends, in part, axially around the groove (48). The inventive device is characterised in that the flange (46) comprises at least one more or less truncated cone-shaped slit (55) which is open towards the rear and which is intended to make the flange (46) radially flexible so as to prevent said flange from separating from the groove (48).
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