PLANETARY GEAR TRAIN OF AUTOMATIC TRANSMISSION FOR VEHICLE

摘要

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting changed torque, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first rotation shaft selectively connected to a transmission housing, a second rotation, a third rotation shaft, a fourth rotation shaft selectively connected to the third rotation shaft, a fifth rotation shaft directly connected to the input shaft, and selectively connected to the third rotation shaft, a sixth rotation shaft, a seventh rotation shaft selectively connected to the sixth rotation shaft or the transmission housing, and an eighth rotation shaft directly connected to the output shaft, and selectively connected to the sixth rotation shaft.

主权项

1. A planetary gear train of an automatic transmission for a vehicle, comprising:
an input shaft receiving torque of an engine; an output shaft outputting changed torque; a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear; a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear; a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear; a fourth planetary gear set including a fourth sun gear, a fourth planet carrier, and a fourth ring gear; a first rotation shaft including the first sun gear, the second ring gear, and the third planet carrier and selectively connected to a transmission housing; a second rotation shaft including the first planet carrier and the fourth ring gear; a third rotation shaft including the first ring gear; a fourth rotation shaft including the second sun gear and selectively connected to the third rotation shaft; a fifth rotation shaft including the second planet carrier and the third ring gear, directly connected to the input shaft, and selectively connected to the third rotation shaft; a sixth rotation shaft including the third sun gear; a seventh rotation shaft including the fourth sun gear and selectively connected to the sixth rotation shaft or the transmission housing; and an eighth rotation shaft including the fourth planet carrier, directly connected to the output shaft, and selectively connected to the sixth rotation shaft.