Planetary gear train of automatic transmission for vehicle
First Claim
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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;
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 interconnecting the first rotational element and the seventh rotational element;
a second shaft fixedly connected with the sixth rotational element and fixedly connected with the input shaft;
a third shaft fixedly connected with the third rotational element;
a fourth shaft fixedly connected with the fourth rotational element and selectively connected with a transmission housing;
a fifth shaft fixedly connected with the fifth rotational element and the ninth rotational element;
a sixth shaft fixedly connected with the eighth rotational element, selectively connected with the second shaft, and selectively connected with the transmission housing;
a seventh shaft fixedly connected with the tenth rotational element and externally gear-meshed with the first shaft;
an eighth shaft fixedly connected with the eleventh rotational element, externally gear-meshed with the third shaft either fixedly or selectively, and fixedly connected with the output shaft;
a ninth shaft fixedly connected with the twelfth rotational element and selectively connected with the transmission housing; and
two transfer gear sets each of which forming external gear-engagement of corresponding shafts,wherein the second rotational element is connected with the second shaft either fixedly or selectively.
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Abstract
The present disclosure provides nine forward speeds and one reverse speed. They are achieved by a planetary gear train of an automatic transmission that includes a main shifting portion having three planetary gear sets arranged on an input shaft, an auxiliary shifting portion having one planetary gear set arranged on an output shaft, nine shafts respectively connected with corresponding rotational elements of the four planetary gear sets, and two transfer gears respectively forming external gear-engagement between the main and auxiliary shifting portions.
5 Citations
31 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;
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 interconnecting the first rotational element and the seventh rotational element; a second shaft fixedly connected with the sixth rotational element and fixedly connected with the input shaft; a third shaft fixedly connected with the third rotational element; a fourth shaft fixedly connected with the fourth rotational element and selectively connected with a transmission housing; a fifth shaft fixedly connected with the fifth rotational element and the ninth rotational element; a sixth shaft fixedly connected with the eighth rotational element, selectively connected with the second shaft, and selectively connected with the transmission housing; a seventh shaft fixedly connected with the tenth rotational element and externally gear-meshed with the first shaft; an eighth shaft fixedly connected with the eleventh rotational element, externally gear-meshed with the third shaft either fixedly or selectively, and fixedly connected with the output shaft; a ninth shaft fixedly connected with the twelfth rotational element and selectively connected with the transmission housing; and two transfer gear sets each of which forming external gear-engagement of corresponding shafts, wherein the second rotational element is connected with the second shaft either fixedly or selectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. 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 seventh rotational element, the sixth rotational element is fixedly connected with the input shaft, the fourth rotational element is selectively connected with a transmission housing, the fifth rotational element is fixedly connected with the ninth rotational element, the eighth rotational element is selectively connected with the sixth rotational element, and selectively connected with the transmission housing, the tenth rotational element is externally gear-meshed with the first rotational element, the eleventh rotational element is externally gear-meshed with the third rotational element either fixedly or selectively, and fixedly connected with the output shaft, the twelfth rotational element is selectively connected with the transmission housing, the second rotational element is connected with the sixth rotational element either fixedly or selectively, and first and second transfer gear sets are respectively arranged between the third and eleventh rotational elements and between the first and tenth rotational elements. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification