| 摘要 |
A servo-assistance mechanism (10) comprises an element (20) upon which a manual shifting force to be assisted acts. The servo-assistance mechanism (10) further comprises at least one valve piston (40, 48), arranged on the element (20), and at least one device (58, 60), for limiting the servo-assistance force. The valve piston (40, 48) comprises a first valve piston (42, 50) and a second valve piston (44, 52), and the first valve piston (42, 50) co-operates with the device (58, 60) for limiting the servo-assistance force and is arranged and radially sealed inside the second valve piston (44, 52).
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