PLANETARY GEAR TRAIN OF AUTOMATIC TRANSMISSION FOR A VEHICLE

摘要

A planetary gear train of automatic transmission may comprise an input shaft, an output shaft, first, second, third, and fourth planetary gear sets having first to twelfth rotating element, and six control elements disposed between one of the rotating elements and another 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 third rotating element, the output shaft is connected with the eleventh rotating element continuously, the second rotating element is directly connected with the eleventh rotating element, the third rotating element is directly connected with the fourth rotating element, the fifth rotating element is directly connected with the ninth rotating element, the sixth rotating element is directly connected with the tenth rotating element, and the seventh rotating element is selectively connected with the transmission housing.

主权项

1. A planetary gear train of an automatic transmission for a vehicle comprising:
an input shaft receiving a rotary power of an engine; an output shaft outputting the rotary power with rotary speed changed; a first planetary gear set having a first rotating element, a second, rotating element and a third rotating element; a second planetary gear set having a fourth rotating element, a fifth rotating element, and a sixth rotating element; a third planetary gear set having a seventh rotating element, an eighth rotating element, and a ninth rotating element; a fourth planetary gear set having a tenth rotating element, a eleventh rotating element, and a twelfth rotating element; and six control elements disposed between one of the rotating elements and another 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 third rotating element, wherein the output shaft is connected with the eleventh rotating element continuously, wherein the second rotating element is directly connected with the eleventh rotating element, wherein the third rotating element is directly connected with the fourth rotating element, wherein the fifth rotating element is directly connected with the ninth rotating element, wherein the sixth rotating element is directly connected with the tenth rotating element, and wherein the seventh rotating element is selectively connected with the transmission housing, and wherein the planetary gear train implements transmission steps of at least 9 forward speeds and at least one reverse speed while three control elements operate among the six control elements.