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;
a first externally-engaged gear set having thirteenth and fourteenth rotational elements;
a second externally-engaged gear set having fifteenth and sixteenth rotational elements;
an input shaft disposed coaxial with the first, second, and third planetary gear sets; and
an output shaft disposed in parallel with the input shaft and coaxial with the fourth planetary gear set,wherein the second rotational element is fixedly connected with the input shaft,the fourth rotational element and the seventh rotational element are connected with the tenth rotational element through the second externally-engaged gear set,the sixth rotational element is connected with the eleventh rotational element through the first externally-engaged gear set, andthe eleventh rotational element being fixedly connected with the output shaft.
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Abstract
A planetary gear train of an automatic transmission 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, eleven 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.
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Citations
20 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; a first externally-engaged gear set having thirteenth and fourteenth rotational elements; a second externally-engaged gear set having fifteenth and sixteenth rotational elements; an input shaft disposed coaxial with the first, second, and third planetary gear sets; and an output shaft disposed in parallel with the input shaft and coaxial with the fourth planetary gear set, wherein the second rotational element is fixedly connected with the input shaft, the fourth rotational element and the seventh rotational element are connected with the tenth rotational element through the second externally-engaged gear set, the sixth rotational element is connected with the eleventh rotational element through the first externally-engaged gear set, and the eleventh rotational element being fixedly connected with the output shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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 on 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 an external circumference of the output shaft, wherein the first rotational element is fixedly connected with a transmission housing, the second rotational element is selectively connected with the fifth rotational element and the ninth rotational element, and fixedly connected with the input shaft, the third rotational element is selectively connected with the eighth rotational element, the fourth rotational element is fixedly connected with the seventh rotational element and externally gear-meshed with the tenth rotational element, the sixth rotational element is externally gear-meshed with the eleventh rotational element, the ninth rotational element is selectively connected with the transmission housing, the eleventh rotational element is fixedly connected with the output shaft, the twelfth rotational element is selectively connected with the transmission housing, and two transfer gears are respectively arranged between the sixth and eleventh rotational elements and between the fourth and tenth rotational elements. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification