STEPWISE AUTOMATIC TRANSMISSION FOR SADDLE RIDING TYPE VEHICLE, POWER UNIT EQUIPPED WITH THE SAME, AND SADDLE RIDING TYPE VEHICLE EQUIPPED WITH THE SAME

摘要

A stepwise automatic transmission in which the mass is concentrated in the front-back direction. The stepwise automatic transmission (31) comprises an input shaft (52), an intermediate shaft (54), an output shaft (33), a first clutch (55) which is connected/disconnected depending on the rotational speed of the input shaft (52), first and second power transmission mechanisms (26, 27), and a second clutch (70) which is connected/disconnected depending on the rotational speed of the intermediate shaft (54). The intermediate shaft (54) is located in the rear of the input shaft (52). The first power transmission mechanism (26) transmits the rotation of the input shaft (52) to the intermediate shaft (54) when the first clutch (55) is connected. The second clutch (70) is provided on the intermediate shaft (54). The second power transmission mechanism (27) transmits the rotation of the intermediate shaft (54) to the output shaft when the second clutch (70) is connected. When viewed from the direction of the shaft center of the input shaft (52), the front end (70b) of the second clutch (70) is located on the front side of the rear end (55a) of the first clutch (55).