| 摘要 |
Pneumatic brake servo comprising a body (10) having an axis of symmetry (X-X'), sealingly separated by a moveable partition (12) into a front chamber (14) permanently linked to a low pressure source and a rear chamber (16) selectively linked to the front chamber (14) or to a high pressure source by a three-way valve (30) actuated by a control rod (28) which engages, via the front face of a plunger (26), with the rear face of a thrust rod (82) integral with a reaction plate (80). An auxiliary housing (32) integral with said moveable partition (12) projects into the front chamber (14). An auxiliary piston (34) sealingly divides the interior of the inner auxiliairy housing (32) into a front volume (36) and a rear volume (38), the auxiliairy piston (34) being mounted stationary in relation to the body (10), the front volume (36) being permanently linked to the rear chamber (16) and the rear volume (38) being permanently linked to the front chamber (14). According to the invention, the brake servo further comprises at least one member integral with the front (42) and rear (44) walls of the body (10) for transmitting the reaction force (50, 100) which passes through the body (10) parallel to the axis of symmetry (X-X') of said brake servo.
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