Planetary gear train of automatic transmission for vehicle

摘要

A planetary gear train of an automatic transmission of a vehicle may include 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, a second rotation shaft, a third rotation shaft, a fourth rotation shaft, a fifth rotation shaft, a sixth rotation shaft, a seventh rotation shaft, and an eighth 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 and second sun gears and selectively connected to a transmission housing; a second rotation shaft including the first planet carrier and the third and fourth ring gears; a third rotation shaft including the first ring gear and selectively connected to the transmission housing; a fourth rotation shaft including the second planet carrier, directly connected to the input shaft, and selectively connected to the second rotation shaft; a fifth rotation shaft including the second ring gear and the third sun gear; a sixth rotation shaft including the third planet carrier; 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.