| 摘要 |
The device has a reverse tipper (40) pivotedly mounted around a pivoting axis (36) coupled to a casing of a gearbox and axially displacing a sliding gear for engaging to a drive gear and a driven gear, respectively. A cam is coupled to the tipper, and has a fixed cam profile cooperating with a shift fork (60) of a synchronization sleeve of a forward gear. The cam includes a circle arc shaped cam groove (46) centered on the pivoting axis of the tipper, and is cooperated with pins (64) connected to the fork, where the tipper includes an inertia mass, which is closed to the groove of the cam.
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