Planetary gear train of automatic transmission for vehicles
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsIlhan Yoo, Seongwook Ji, Juhyeon Park, Hyun Sik Kwon, Seong Wook Hwang, Ki Tae Kim
Life of this patent
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Abstract
A planetary gear train of an automatic transmission for a vehicle is disclosed. The planetary gear train includes an input shaft for receiving an engine torque, an output shaft for outputting a torque, four planetary gear sets each having three rotational elements. The planetary gear train further comprises a plurality of additional shafts, each of which is selectively connected to the transmission housing and fixedly connected to a rotation element of the first, second, third, and fourth planetary gear set that is not fixedly connected with any of the first to fifth shafts.
Claims9
A planetary gear train of an automatic transmission for a vehicle, comprising:
- an input shaft for receiving an engine torque;
- an output shaft for outputting a torque;
- a first planetary gear set having first, second, and third rotational elements;
- a second planetary gear set having fourth, fifth, and sixth rotational elements;
- a third planetary gear set having seventh, eighth, and ninth rotational elements;
- a fourth planetary gear set having tenth, eleventh, and twelfth rotational elements;
- a first shaft fixedly connected with the third rotational element and selectively connected with the input shaft;
- a second shaft fixedly connected with the fourth rotational element and selectively connected with the input shaft;
- a third shaft fixedly connected with the twelfth rotational element and fixedly connected with the output shaft;
- a fourth shaft fixedly connected with the first rotational element, the sixth rotational element, and the eighth rotational element;
- a fifth shaft fixedly connected with the ninth rotational element and the tenth rotational element;
- and
- a plurality of additional shafts, each of which is selectively connected to the transmission housing and fixedly connected to a rotation element of the first, second, third, and fourth planetary gear sets that is not fixedly connected with any of the first to fifth shafts.
A planetary gear train of an automatic transmission for a vehicle, comprising:
- an input shaft for receiving an engine torque;
- an output shaft for outputting a torque;
- a first planetary gear set having first, second, and third rotational elements;
- a second planetary gear set having fourth, fifth, and sixth rotational elements;
- a third planetary gear set having seventh, eighth, and ninth rotational elements;
- and
- a fourth planetary gear set having tenth, eleventh, and twelfth rotational elements,
- the first rotational element is fixedly connected with the sixth rotational element and the eighth rotational element,
- the second rotational element is fixedly connected with the fifth rotational element and the eleventh rotational element, and selectively connected with the transmission housing,
- the third rotational element is selectively connected with the input shaft,
- the fourth rotational element is selectively connected with the input shaft,
- the seventh rotational element is selectively connected with the sixth rotational element and the transmission housing, respectively,
- the ninth rotational element is fixedly connected with the tenth rotational element,
- the twelfth rotational element is fixedly connected with the output shaft, and selectively connected with the eighth rotational element.
Dependencies are inferred from the claim text.