PLANETARY GEAR TRAIN OF AUTOMATIC TRANSMISSION FOR VEHICLE

摘要

A planetary gear set of an automatic transmission for a vehicle may include an input shaft for receiving an engine torque, an output shaft for outputting a shifted torque of the engine, a first planetary gear set including first, second, and third rotational elements, a second planetary gear set including fourth, fifth, and sixth rotational elements, a third planetary gear set including seventh, eighth, and ninth rotational elements, a fourth planetary gear set including tenth, eleventh, and twelfth rotational elements, and six control elements for selectively interconnecting the rotational elements and a transmission housing.

主权项

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