TRANSMISSION

摘要

To provide a downsizable and inexpensive transmission in which shifting is done by first and second shift clutches to which a power of an engine is transmitted. A transmission includes a first shifting part and a second shifting part which shift a power of an internal combustion engine, a first shift clutch transmitting and interrupting the power to the first shifting part, and a second shift clutch transmitting and interrupting the power to the second shifting part, and a selection mechanism which selects gear steps. The selection mechanism includes three shifters that are respectively guided by cam groove s of a single shift drum through shift forks. The shifters can be respectively moved to selection positions where the gear steps are selected and to neutra l positions where the gear steps are not selected in the first shifting part a nd the second shifting part. The cam grooves guide the shifters to the selection positions in each of the first shifting part and the second shifting part fo r each of predetermined rotational positions of the shift drum.