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 configured to receive torque of an engine, an output shaft outputting changed torque, a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear as rotation elements thereof, a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear as rotation elements thereof, a third planetary gear set having a third sun gear, a third planet carrier, and a third ring gear as rotation elements thereof, and a fourth planetary gear set having a fourth sun gear, a fourth planet carrier, and a fourth ring gear as rotation elements thereof.

主权项

1. A planetary gear train of an automatic transmission for a vehicle comprising:
an input shaft configured to receive torque of an engine; an output shaft outputting changed torque; a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear as rotation elements thereof; a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear as rotation elements thereof; a third planetary gear set having a third sun gear, a third planet carrier, and a third ring gear as rotation elements thereof; a fourth planetary gear set having a fourth sun gear, a fourth planet carrier, and a fourth ring gear as rotation elements thereof; a first rotation shaft directly connecting one rotation element of the first planetary gear set to one rotation element of the second planetary gear set, and selectively connected to a transmission housing; a second rotation shaft connected to another rotation element of the first planetary gear set and is directly connected to the input shaft; a third rotation shaft directly connecting the other rotation element of the first planetary gear set to one rotation element of the fourth planetary gear set; a fourth rotation shaft directly connected to another rotation element of the second planetary gear set and selectively connected to the first rotation shaft or the second rotation shaft; a fifth rotation shaft connected to the other rotation element of the second planetary gear set; a sixth rotation shaft directly connecting one rotation element of the third planetary gear set to another rotation element of the fourth planetary gear set, and selectively connected to the fourth rotation shaft; a seventh rotation shaft directly connecting another rotation element of the third planetary gear set to the other rotation element of the fourth planetary gear set, and directly connected to the output shaft; and an eighth rotation shaft connected to the other rotation element of the third planetary gear set and selectively connected to the fifth rotation shaft or to the transmission housing.