| 摘要 |
<p>Pneumatic brake servo comprising a casing (10) containing a piston formed from a rear tubular part (22) supporting a skirt (14), and which, with the aid of a rolling diaphragm (12), defines a front chamber (16) permanently connected to a vacuum source and a rear chamber (18) selectively connected to the front chamber (16) or the atmosphere by a valve (40) operated by a control rod (34) capable of bearing, by means of the front side of a plunger (32), on a first side of a reaction disk (58) integral on its second side with a thrust rod (5). According to the invention, the piston (20) bears on the reaction disk (58) through an annular, elastic front side (68, 68').</p> |
