| 摘要 |
A shift mechanism for engaging and disengaging clutches comprises an axially movable clutch sleeve (1) which is positively connected to at least one of the two halves thereof. The motion for engaging and disengaging the clutch is imparted to the sleeve (1) by way of a shift fork (16) whose two arms engage around the sleeve (1). A rolling bearing (21, 35, 37) between the shift fork (16) and the sleeve (1) provides a rotary connection between the two fork arms (16a, 16b) and the sleeve (1). The rolling bearing (21) is so preloaded that both its races are loaded continuously by way of its rolling members, to obviate sliding between the latter races and the rolling members upon engagement of the clutch - i.e., during the initial movement of the sleeve (1). <IMAGE>
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