Transmission

摘要

In a transmission, a transmission stage is formed by a mating pair of a first driving gear rotationally fixed to an input shaft and a first driven gear mounted on an output shaft in a rotatable manner and releasably connectable rotationally to the output shaft by a first clutch, and another transmission stage is formed by another mating pair of a second driving gear rotationally fixed to a supplemental shaft and a second driven gear mounted on the output shaft in a rotatable manner and releasably connectable rotationally to the output shaft by a second clutch while the supplemental shaft is rotationally driven by the input shaft by a supplemental gear rotationally fixed to the supplemental shaft and mating with the first driven gear.