Automatic transmission.

摘要

Herein disclosed is an automatic transmission including gear trains, which are constructed of at least three planetary gear sets each having three rotating members, i.e., a sun gear, a carrier and a ring gear for changing the speeds of the rotations of an input shaft (4) and transmitting the same to an output shaft (5), the first and second ones of the three planetary gear sets being arranged adjacent to and at an extension of the axis of the input shaft (4). The automatic transmission comprises: first clutch means (K1) arranged closer to the input shaft (4) than the first planetary gear set (1) for connecting any one of the rotating members of the first planetary gear set (1) arranged adjacent to the input shaft (4); second clutch means (K2) arranged closer to the input shaft (4) than the first planetary gear set (1) for connecting another of the rotating members of the first planetary gear set (1) and the input shaft (4); third clutch means (K3) interposed between the first planetary gear set (1) and the second planetary gear set (2) for connecting any one of the rotating members of the second planetary gear set (2) arranged at the opposite side to the input shaft (4) across the first planetary gear set (1) and the any one or the another of the rotating members of either one of the first clutch means (K1) and the second clutch means (K2) or the first planetary gear set (1); and fourth clutch means (K4) interposed between the first planetary gear set (1) and the second planetary gear set (2) for connecting the another of the rotating members of the second planetary gear set (2) and the any one or the another of the rotating members of the first clutch means (K1), the second clutch means (K2) or the first planetary gear set (1).