| 摘要 |
<p>A shift device (1) includes a hub (20), a sleeve (24) splined with the hub (20), and a pair of speed gears (12, 14) sandwiching the hub (20). Thrust pieces (28) are respectively inserted in the concave portions (24g) of the sleeve (24) and movable in the notches (20f) of the hub (20) in an axial direction, and formed with slanted surfaces (20h, 20i, 20j, 20k) on their outer circumference for contacting with slanted surfaces (24e, 24f) of the sleeve (24), and contact with projections (16e) of synchronizer rings (16) so that the thrust pieces (28) can move around the projections (16e) and push the projections (16e) in the axial direction. The thrust pieces (28) are also formed with projecting portions (28d, 28e) at their four edges, seen from an outside of the hub (20) in a radial direction, the projecting portions (28d, 28e) being formed with slanted surfaces (28b, 28c) corresponding to the slanted surfaces (20h, 20i, 20j, 20k) of the hub (20).
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