STEPPED AUTOMATIC TRANSMISSION DEVICE AND MOTORCYCLE WITH THE SAME

摘要

[Problem] To provide a stepped automatic transmission with four or more speeds that has a simple configuration and an innovative structure. [Means for Resolution] A transmission 31 includes an input shaft 52, a first rotation shaft 53, a second rotation shaft 54, and a third rotation shaft 64 that are arranged in the front-rear direction. The input shaft 52 is provided with a group of clutches 81 on the upstream side that includes a first clutch 55 and a second clutch 59. The first clutch 55 and the second clutch 59 include a first pair of shift gears 86 and a second pair of shift gears 83, respectively. The second rotation shaft 54 is provided with a group of clutches 82 on the downstream side that includes a third clutch 70 and a fourth clutch 66. The third clutch 70 and the fourth clutch 66 include a third pair of shift gears 91 and a fourth pair of shift gears 90, respectively. The group of clutches 81 on the upstream side and the group of clutches 82 on the downstream side are arranged at locations where they at least partially overlap in the axial direction of the input shaft 52.