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 rotary power of an engine, an output shaft outputting the rotary power with rotary speed changed, a first planetary gear set including a first, a second, and a third rotating element, a second planetary gear set including a fourth, a fifth, and a sixth rotating element, a third planetary gear set including a seventh, an eighth, and a ninth rotating element, a fourth planetary gear set including a tenth, a eleventh, and a twelfth rotating element, and seven control elements disposed between one of the rotating elements and another of the rotating elements or the input shaft, between one of the rotating elements and the output shaft, or between one of the rotating elements and a transmission housing.

主权项

1. A planetary gear train of an automatic transmission for a vehicle comprising:
an input shaft receiving rotary power of an engine; an output shaft outputting the rotary power with rotary speed changed; a first planetary gear set including a first, a second, and a third rotating element; a second planetary gear set including a fourth, a fifth, and a sixth rotating element; a third planetary gear set including a seventh, an eighth, and a ninth rotating element; a fourth planetary gear set including a tenth, a eleventh, and a twelfth rotating element; and seven control elements disposed between one of the rotating elements and another of the rotating elements or the input shaft, between one of the rotating elements and the output shaft, or between one of the rotating elements and a transmission housing, wherein the input shaft is directly connected with the second rotating element, the output shaft is directly connected with the eleventh rotating element, the first rotating element is directly connected with the sixth rotating element, the first rotating element is directly connected with the eighth rotating element, the seventh rotating element is directly connected with the eleventh rotating element, the ninth rotating element is directly connected with the tenth rotating element, and the output shaft is selectively connected with the third rotating element, and wherein the planetary gear train implements transmission steps of at least ten forward speeds and at least one reverse speed while three control elements operate among the seven control elements.