| 摘要 |
The invention provides a pneumatic servomotor for an assisted braking of a motor vehicle, of the type comprising a unidirectional clutch device (56), which includes a coaxial sleeve (58), sliding on a plunger (46), and a substantially ring-shaped key (60), arranged with a given clearance around the sleeve (58) and capable of being driven by a moving piston (22), when an input force is applied at a determined speed onto a control rod (38) integral with the plunger (46), so as to rock and lock the sleeve (58) in an axial position, in which it locks a finger (52) biasing the piston (22) independently of the control rod (38), characterised in that the finger (52) is axially integral with the sleeve (58) and in that means are provided for an axial indexing of the locking position of the sleeve (58)
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