Planetary gear train of automatic transmission for vehicle
AssigneeHyundai Motor Company
InventorsJae Chang Kook, Hyun Sik Kwon, Wonmin Cho, Seong Wook Hwang, Seongwook Ji
Life of this patent
Estimating the term…
Abstract
A planetary gear train of an automatic transmission for a vehicle is provided. In particular, nine or more forward speeds and one or more reverse speed are achieved by the planetary gear train of the automatic transmission including an input shaft, an output shaft, four planetary gear sets respectively having three rotational elements, and six control elements for selectively interconnecting the rotational elements and a transmission housing.
Claims8
A planetary gear train of an automatic transmission for a vehicle, comprising:
- an input shaft configured to receive an engine torque;
- an output shaft configured to output a shifted 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 connected with the first rotational element;
- a second shaft interconnecting the second rotational element and the fourth rotational element and tenth rotational element and directly connected with the input shaft;
- a third shaft connecting the third rotational element and the eighth rotational element;
- a fourth shaft connected with the fifth rotational element;
- a fifth shaft connected with the sixth rotational element;
- a sixth shaft connected with the seventh rotational element, and selectively connected with the fourth shaft and the fifth shaft, respectively;
- a seventh shaft interconnecting the ninth rotational element and the eleventh rotational element and directly connected with the output shaft;
- and
- an eighth shaft connected with the twelfth rotational element and selectively connected with the third shaft.
A planetary gear train of an automatic transmission for a vehicle, comprising:
- an input shaft configured to receive an engine torque;
- an output shaft configured to output a shifted 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,
- wherein the input shaft is directly connected with the second rotational element,
- the output shaft is directly connected with the eleventh rotational element,
- the second rotational element is directly connected with the fourth rotational element and the tenth rotational element and directly connected with the input shaft,
- the third rotational element is directly connected with the eighth rotational element,
- the seventh rotational element is selectively connected with the fifth rotational element and the sixth rotational element respectively,
- the ninth rotational element is directly connected with the eleventh rotational element and directly connected with the output shaft, and
- the twelfth rotational element is selectively connected with the eighth rotational element.
Dependencies are inferred from the claim text.