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, a second rotation shaft directly connected to the input shaft, a third rotation shaft, a fourth rotation shaft selectively connected to the first rotation shaft or the second rotation shaft, a fifth rotation shaft selectively connected to a transmission housing, a sixth rotation shaft selectively connected to the transmission housing, a seventh rotation shaft selectively connected to the first rotation shaft, and an eighth rotation shaft directly connected to the output shaft, and selectively connected to the first 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; a second rotation shaft including the first planet carrier and directly connected to the input shaft; a third rotation shaft including the first ring gear, the second planet carrier, and the third ring gear; a fourth rotation shaft including the second and third sun gears and selectively connected to the first rotation shaft or the second rotation shaft; a fifth rotation shaft including the third planet carrier and the fourth ring gear and selectively connected to a transmission housing; a sixth rotation shaft including the second ring gear and selectively connected to the transmission housing; a seventh rotation shaft including the fourth sun gear and selectively connected to the first rotation shaft; and an eighth rotation shaft including the fourth planet carrier, directly connected to the output shaft, and selectively connected to the first rotation shaft.