Planetary gear train of automatic transmission for vehicles
First Claim
1. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising:
- 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;
an input shaft mounted with the first, second, and third planetary gear sets at an external circumference of the input shaft; and
an output shaft disposed in parallel with the input shaft and mounted with the fourth planetary gear set on external circumference of the output shaft;
a first shaft fixedly connected with the first rotational element and the fourth rotational element;
a second shaft fixedly connected with the second rotational element and the input shaft;
a third shaft fixedly connected with the third rotational element and the ninth rotational element;
a fourth shaft fixedly connected with the fifth rotational element;
a fifth shaft fixedly connected with the sixth rotational element;
a sixth shaft fixedly connected with the seventh rotational element;
a seventh shaft fixedly connected with the eighth rotational element;
a eighth shaft fixedly connected with the tenth rotational element and externally engaged with the sixth shaft;
a ninth shaft fixedly connected with the eleventh rotational element and the output shaft;
a tenth shaft fixedly connected with the twelfth rotational element and externally engaged with the fourth shaft; and
two transfer gears externally gear-meshed with the fourth and sixth shafts, respectively.
1 Assignment
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Accused Products
Abstract
A planetary gear train of an automatic transmission provides at least eight forward speeds and one reverse speed by combination of: first to fourth planetary gear sets respectively having first to third rotational elements, fourth to sixth rotational elements, seventh to ninth rotational elements or tenth to twelfth rotational elements; two transfer gears and five control elements selectively connecting one shaft to another shaft selected from first to tenth shafts or to a transmission housing. In particular, an input shaft is mounted with the first, second and third planetary gear sets, an output shaft is mounted with the fourth planetary gear set, the eighth shaft is fixedly connected with the tenth rotational element and externally engaged with the sixth shaft via one of the two transfer gears; the tenth shaft is fixedly connected with the twelfth rotational element and externally engaged with the fourth shaft via the other transfer gear.
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Citations
17 Claims
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1. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising:
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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; an input shaft mounted with the first, second, and third planetary gear sets at an external circumference of the input shaft; and an output shaft disposed in parallel with the input shaft and mounted with the fourth planetary gear set on external circumference of the output shaft; a first shaft fixedly connected with the first rotational element and the fourth rotational element; a second shaft fixedly connected with the second rotational element and the input shaft; a third shaft fixedly connected with the third rotational element and the ninth rotational element; a fourth shaft fixedly connected with the fifth rotational element; a fifth shaft fixedly connected with the sixth rotational element; a sixth shaft fixedly connected with the seventh rotational element; a seventh shaft fixedly connected with the eighth rotational element; a eighth shaft fixedly connected with the tenth rotational element and externally engaged with the sixth shaft; a ninth shaft fixedly connected with the eleventh rotational element and the output shaft; a tenth shaft fixedly connected with the twelfth rotational element and externally engaged with the fourth shaft; and two transfer gears externally gear-meshed with the fourth and sixth shafts, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising:
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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; an input shaft mounted with the first, second, and third planetary gear sets at an external circumference of the input shaft; and an output shaft disposed in parallel with the input shaft and mounted with the fourth planetary gear set on external circumference of the output shaft, wherein the first rotational element is fixedly connected with the fourth rotational element, the second rotational element is fixedly connected with the input shaft, the third rotational element is fixedly connected with the ninth rotational element, the fifth rotational element is externally gear-meshed with the twelfth rotational element through a first transfer gear, the seventh rotational element is externally gear-meshed with the tenth rotational element through a second transfer gear, and the eleventh rotational element is fixedly connected with the output shaft. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification