| 摘要 |
A shiftable change speed gear system, particularly a transmission, having resilient shifting mechanisms for simplifying the transmission structure and the shifting thereof. The transmission is preferably provided with multiple countershafts having countershaft gears thereon disposed in meshing engagement with main shaft gears encircling the transmission main shaft, which main shaft gears are axially immovable relative to the main shaft. The main shaft gears are nonrotatably connected to first clutch rings surrounding the main shaft, which clutch rings are axially movable relative to both the main shaft gears and the main shaft. The first clutch rings coact with second clutch rings which are nonrotatably secured to the main shaft. The cooperating pairs of clutch rings have resilient means associated therewith, whereby axial shifting of the cooperating clutch rings permits clutch engagement to be delayed until substantial speed synchronization between the clutch rings is achieved, whereupon the resilient means then causes relative axial movement between the cooperating clutch rings so that they meshingly engage one another to drivingly connect the respective main shaft gear to the main shaft.
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