| 摘要 |
A mechanical selector device for a gear changing gearbox of a motor vehicle with a non-synchronized reverse gear has an axially displaceable idler gear, which is connected by means of a selector unit with a selector sliding sleeve, by means of whose axial displacement first a synchronizer clutch and subsequently a positive drive gear clutch of a forward gear can be operated. In order to facilitate the engagement of the idler gear when the gearbox driven shaft and the rotating layshaft are stationary, the selector sliding sleeve is connected with a slotted lever having a slot and being pivotable about a bearing axis fixed in location with respect to the gearbox casing and the selector unit is connected to a slot follower constrained to travel in the slot and having a movement path fixed with respect to the spatial axes of the gearbox casing-or vice versa. The slot has two neutral sections, each of which has a shape conforming to the movement path and an intermediate engagement section with a shape deviating from the movement path in such a way that when the reverse gear is selected, the slot follower passes from one neutral section into the other neutral section, passing through the engagement section, and thus operates exclusively the synchronizer clutch, bringing this into frictional connection over only a limited section of the engagement path. |
