| 摘要 |
The invention concerns a pneumatic booster comprising a rigid casing (1) wherein a mobile partition (2) sealingly defines a front chamber (3) and a rear chamber (4), a pneumatic piston (5) moving with the mobile partition (2), a plunger (8) housed in the piston (5) and driven by a control rod (7) and controlling the state of a three-way valve (9), effort transmitting means (10, 13, 17, 18, 31) adapted to receive and transmit at least a booster force (Fa) exerted by a front face (51) of the piston (5) when the valve (9) submits the rear chamber (4) to the second pressure (Pa), the plunger (8) comprising a front section (81) including retaining means (18, 31) adapted to cause the front section (81) of the plunger (8) to be controlled by the pneumatic piston (5). The invention is characterised in that the retaining means comprise a unidirectional clutch device (31, 18) driving the effort transmitting means (10, 13, 17) independently of the control rod (7) and the rear section of the plunger (8) when they are stressed by the pneumatic piston (5) in response to the control rod (7) being actuated at a speed higher than a predetermined value.
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