Patent ID: 7377874
Filing Date: 2008-05-27
Classification: F16H

Abstract:
1. An automatic transmission, in which an input shaft and an output shaft are rotatably supported on a common axis, and a rotation of the input shaft is shifted to a plurality of speeds and transmitted to the output shaft by connecting and fixing a plurality of friction engagement elements, comprising: a transmission case rotatably supporting the input shaft and the output shaft; a drive member, to which an output rotation of an engine is transmitted, that is rotatably supported on the common axis on a front side of the transmission case; and a speed-increasing planetary gear that constantly accelerates and transmits the output rotation of the engine to the input shaft, and includes a first rotation element that is connectable with the drive member via a start clutch, a second rotation element that is directly connected to the input shaft, and a third rotation element that is fixed to a support member of the transmission case, wherein: