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 of the engine, 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 connectable to the input shaft, a second rotation shaft directly connected to the input shaft, a third rotation shaft selectively connectable to a transmission housing, a fourth rotation shaft, a fifth rotation shaft selectively connectable to at least one of the second rotation shaft and the third rotation shaft, a sixth rotation shaft selectively connectable to the first rotation shaft, and directly connected to the output shaft, and a seventh rotation shaft selectively connectable to the transmission housing.

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 of the engine; a first planetary gear set including a first rotation element, a second rotation element, and a third rotation element; a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element; a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element; a fourth planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element; a first rotation shaft directly connected to the first rotation element and selectively connectable to the input shaft; a second rotation shaft directly connecting the second rotation element with the fourth rotation element and directly connected to the input shaft; a third rotation shaft directly connecting the third rotation element with the sixth rotation element and selectively connectable to a transmission housing; a fourth rotation shaft directly connecting the fifth rotation element with the seventh rotation element; a fifth rotation shaft directly connecting the eighth rotation element with the twelfth rotation element and selectively connectable to at least one of the second rotation shaft and the third rotation shaft; a sixth rotation shaft directly connecting the ninth rotation element with the eleventh rotation element, selectively connectable to the first rotation shaft, and directly connected to the output shaft; and a seventh rotation shaft directly connected to the tenth rotation element and selectively connectable to the transmission housing.