| 摘要 |
A shift device includes a hub, a sleeve splined with the hub, and a pair of speed gears sandwiching the hub. Thrust pieces are respectively inserted in the concave portions of the sleeve and movable in the notches of the hub in an axial direction, and formed with slanted surfaces on their outer circumference for contacting with slanted surfaces of the sleeve, and contact with projections of synchronizer rings so that the thrust pieces can move around the projections and push the projections in the axial direction. The thrust pieces are also formed with projecting portions at their four edges, seen from an outside of the hub in a radial direction, the projecting portions being formed with slanted surfaces corresponding to the slanted surfaces of the hub.
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