device for bromskraftforsterkare for motor vehicles

摘要

A low-pressure brake booster for automotive vehicles includes a low-pressure casing which is sealingly subdivided into a low-pressure chamber and a working chamber by an axially movable wall. The axially movable wall includes a flexible diaphragm abutting a diaphragm plate made of plastic. The diaphragm plate has a hub whose end surface is connected in a catching engagement with a metallic spacer ring. The spacer ring has radial ribs that extend through slots of a central reinforcement tube for the casing and transmits the boosting force from the diaphragm plate onto a control valve housing disposed internally of the tube. Latches extending from the diaphragm plate engage by means of detents behind the spacer ring and form a centering arrangement for a compression spring which urges the spacer ring against the hub of the diaphragm plate and, hence, the diaphragm plate into its inoperative position.