| 摘要 |
To provide a multi-stage automatic transmission which includes a small number of clutches in a vehicle-use automatic transmission having a main shaft and a counter shaft. The transmission includes: a first group of drivi ng gears which are fixed to an tubular auxiliary main shaft which is concentrically and rotatably mounted on the main shaft; a first group of follower gears which are rotatably mounted on the counter shaft and are constantly meshed with the first group of driving gears so as to be selectively joined to the counter shaft; a first clutch which performs the power engagement and power disengagement between the main shaft and the tubular auxiliary main shaft; a second group of driving gears which are rotatably mounted on the main shaft and are selectively jointed to the main shaft; a second group of follower gears which are fixed to a tubular auxilia ry counter shaft which is concentrically and rotatably mounted on the counter shaft and are constantly meshed with the second group of driving gears; and a second clutch which performs the power connection and disconnection between the counter shaft and the tubular auxiliary counter shaft. |
