GEAR TRAIN OF TRANSMISSION FOR VEHICLE

摘要

PURPOSE: A transmission train for a vehicle is provided to improve power transmitting efficiency by reducing the rotation number of a first planetary gear device and first and second sun gears of a second planetary gear device. CONSTITUTION: A first compound planetary gear device(CG1) is formed by connecting a first planetary gear device(PG1) to a second planetary gear device(PG2). A second compound planetary gear device(CG2) is formed by connecting a third planetary gear device(PG3) to a fourth planetary gear device(PG4). The second compound planetary gear device is connected to the first compound planetary gear device. An input shaft(IN) is selectively connected to the first and second compound planetary gear devices in multiple routes. An output shaft(OUT) is connected to the second compound planetary gear device. A first clutch(CL1) selectively connects the first rotation element of the second planet gear device to the output shaft. A second clutch(CL2) selectively connects the input shaft to the second rotation element of the first planetary gear device and the third rotation element of the second planetary gear device. A third clutch(CL3) selectively connects the third rotation element of the first planetary gear device and the second rotation element of the second planet gear device. A fourth clutch(CL4) selectively connects the input shaft to the third rotation element of the third planetary gear device and the second rotation element of the fourth planetary gear device. A first brake(B1) selectively fixes the second rotation element of the first planetary gear device and the third rotation element of the second planet gear device. A second brake(B2) selectively fixes the third rotation element of the third planetary gear device and the second rotation element of the fourth planetary gear device. A third brake(B3) selectively fixes the first rotation element of the third planetary gear device and the first rotation element of the fourth planetary gear device.