Patent ID: 9618093
Date: 2017-04-11
CPC Classifications: F16H

Claim:
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 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; a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements; a first shaft connecting the first rotation element to the fourth rotation element; a second shaft connected to the second rotation element and directly connected to the input shaft; a third shaft connecting the third rotation element to the tenth rotation element; a fourth shaft connected to the fifth rotation element and selectively connected to the second shaft; a fifth shaft connecting the sixth rotation element to the ninth rotation element and selectively connected to the second shaft; and a sixth shaft connecting the seventh rotation element to the twelfth rotation element.