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,wherein the first rotational element is fixedly connected with the sixth rotational element,the second rotational element is fixedly connected with the input shaft,the third rotational element is fixedly connected with the seventh rotational element,the tenth rotational element is externally gear-meshed with the fifth rotational element,the eleventh rotational element is externally gear-meshed with the eighth rotational element and is fixedly connected with the output shaft, andfirst and second transfer gear units, wherein the first transfer gear unit is externally gear-meshed with the fifth rotational element and the tenth rotational element, and the second transfer gear unit is externally gear-meshed with the eighth rotational element and eleventh rotational element.
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; and 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, the input shaft is mounted with the first, second, and third planetary gear sets, the output shaft is mounted with the fourth planetary gear set, the eleventh rotational element is externally gear-meshed with the eighth rotational element and fixedly connected with the output shaft, and two transfer gear units are respectively arranged between the fifth and tenth rotational elements and between the eighth and eleventh rotational elements.
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Citations
10 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, wherein the first rotational element is fixedly connected with the sixth rotational element, the second rotational element is fixedly connected with the input shaft, the third rotational element is fixedly connected with the seventh rotational element, the tenth rotational element is externally gear-meshed with the fifth rotational element, the eleventh rotational element is externally gear-meshed with the eighth rotational element and is fixedly connected with the output shaft, and first and second transfer gear units, wherein the first transfer gear unit is externally gear-meshed with the fifth rotational element and the tenth rotational element, and the second transfer gear unit is externally gear-meshed with the eighth rotational element and eleventh rotational element. - View Dependent Claims (2, 3, 4, 5)
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6. 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 sixth 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 seventh rotational element; a fourth shaft fixedly connected with the fourth rotational element; a fifth shaft fixedly connected with the fifth rotational element; a sixth shaft fixedly connected with the eighth rotational element; a seventh shaft fixedly connected with the ninth rotational element; an eighth shaft fixedly connected with the tenth rotational element, and externally gear-meshed with the fifth shaft; a ninth shaft fixedly connected with the eleventh rotational element, externally gear-meshed with the sixth shaft, and fixedly connected with the output shaft; a tenth shaft fixedly connected with the twelfth rotational element; and two transfer gear units externally gear-meshed with the corresponding shafts selected from the first to tenth shafts. - View Dependent Claims (7, 8, 9, 10)
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Specification