| 摘要 |
<p>A shift device includes a shaft (10), a hub (20), a sleeve (24), a pair of speed gears (12, 14) sandwiching the hub, a first synchronizer ring (16), a second synchronizer ring (18), a plurality of thrust pieces (30) disposed in cut-off portions of the hub and a pair of springs (28, 29) pushing the thrust pieces outwardly in a radial direction toward the sleeve. The thrust pieces moves together with the sleeve when the sleeve is moved toward the one of the speed gears, while the thrust pieces moves inwardly in the radial direction against the first and second springs when the sleeve is moved halfway toward the other of the speed gears so that the thrust pieces move in an axial direction and swing to provide different self-servo functions according to the above shift directions when they contact with the hub.</p> |
