| 摘要 |
PROBLEM TO BE SOLVED: To reduce the rotational resistance of a rotating drum to lightly perform shift operation. SOLUTION: The rotating drum 4 with a change cam groove 6 formed on the outer peripheral surface is rotatably disposed near a transmission 3. A shift shaft 18 for putting a dog clutch shift mechanism of the transmission 3 is disposed, and a shift pin 19 engaged with the change cam groove 6 of the rotating drum 4 is rotatably fitted to the shift shaft 18.
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