Patent ID: 9587713
Date: 2017-03-07
CPC Classifications: F16H

Claim:
1. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising: an input shaft receiving power from an engine; an output shaft outputting power changed in speed; a first planetary gear set including first, second, and third rotating elements; a second planetary gear set including fourth, fifth, and sixth rotating elements; a third planetary gear set including seventh, eighth, and ninth rotating elements; a fourth planetary gear set including tenth, eleventh, and twelfth rotating elements; and six control elements disposed between the rotating elements, and disposed at positions where the rotating elements are selectively connected with each other or to a transmission housing, wherein the input shaft is directly connected with the fourth rotating element and simultaneously selectively connected with the eleventh rotating element, the output shaft is directly connected to the eighth rotating element and the twelfth rotating element, the ninth rotating element is directly connected with the eleventh rotating element, the third rotating element is selectively connected with the tenth rotating element, the second rotating element is directly connected with the sixth rotating element, the first rotating element is directly connected to the transmission housing, and three control elements of the six control elements are operated to implement nine forward speeds and at least one reverse speed.