PLANETARY GEAR TRAIN OF AUTOMATIC TRANSMISSION FOR A 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, a first planetary gear set, a second planetary gear set, a third planetary gear set, six friction elements disposed to selectively connect rotation elements of the planetary gear sets with each other and selectively connect the rotation elements with a transmission housing, a first rotation shaft selectively connected to the input shaft, a second rotation shaft, a third rotation shaft selectively connected to at least one of the input shaft and the transmission housing, a fourth rotation shaft selectively connected to the second rotation shaft, a fifth rotation shaft selectively connected to the second rotation shaft, a sixth rotation shaft directly connected to the transmission housing, and a seventh rotation shaft selectively connected to the second rotation shaft, and directly connected to the output 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 of the engine; a first planetary gear set including first, second, and third rotation elements; a second planetary gear set including fourth, fifth, and sixth rotation elements; a third planetary gear set including seventh, eighth, and ninth rotation elements; six friction elements disposed to selectively connect the rotation elements with each other and selectively connect the rotation elements with a transmission housing; a first rotation shaft including the first and ninth rotation elements and selectively connected to the input shaft; a second rotation shaft including the second rotation element; a third rotation shaft including the third rotation element and selectively connected to at least one of the input shaft and the transmission housing; a fourth rotation shaft including the fourth rotation element and selectively connected to the second rotation shaft; a fifth rotation shaft including the fifth and seventh rotation elements and selectively connected to the second rotation shaft; a sixth rotation shaft including the sixth rotation element and directly connected to the transmission housing; and a seventh rotation shaft including the eighth rotation element and selectively connected to the second rotation shaft, and directly connected to the output shaft.