Patent ID: 9638290
Date: 2017-05-02
CPC Classifications: F16H

Claim:
1. A planetary gear set of an automatic transmission for a vehicle, comprising: an input shaft configured for receiving an engine torque; an output shaft configured for outputting a shifted torque; a first planetary gear set having first, second, and third rotation elements; a second planetary gear set having fourth, fifth, and sixth rotation elements; a third planetary gear set having seventh, eighth, and ninth rotation elements; a fourth planetary gear set having tenth, eleventh, and twelfth rotation elements; and six control elements for selectively interconnecting the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth rotation elements and a transmission housing, wherein the input shaft is continuously connected with the second rotation element, the output shaft is continuously connected with the eleventh rotation element, the first rotation element is continuously connected with the tenth rotation element, the second rotation element is continuously connected with the sixth rotation element, the fifth rotation element is continuously connected with the ninth rotation element, the seventh rotation element is continuously connected with the tenth rotation element, the fourth rotation element is selectively connectable with the transmission housing, and at least nine forward speeds and at least one reverse speed is realized by controlling three control elements of the six control elements.