Planetary gear train of transmission for vehicle
First Claim
1. A planetary gear train of an automatic transmission for a vehicle, comprising:
- an input shaft for receiving an engine torque;
an output shaft for outputting a shifted torque;
a first planetary gear set having a first rotational element, a second rotational element, and a third rotational element;
a second planetary gear set having a fourth rotational element, a fifth rotational element, and a sixth rotational element;
a third planetary gear set having a seventh rotational element, an eighth rotational element, and a ninth rotational element;
a fourth planetary gear set having a tenth rotational element, an eleventh rotational element, and a twelfth rotational element;
a first shaft fixedly connected to the third rotational element and selectively connected to the input shaft;
a second shaft fixedly connected to the ninth rotational element and selectively connected to the input shaft;
a third shaft fixedly connected to the eleventh rotational element and fixedly connected to the output shaft;
a fourth shaft fixedly connected to the first rotational element, the fourth rotational element, and the seventh rotational element;
a fifth shaft fixedly connected to the second rotational element and the tenth rotational element; and
a plurality of shafts each selectively connecting a corresponding element to a transmission housing, wherein the corresponding element is a rotational element, that is not fixedly interconnected, of one or more of the second planetary gear set, the third planetary gear sets, or the fourth planetary gear set;
wherein the plurality of shafts comprises;
a sixth shaft fixedly connected to the fifth rotational element and the eighth rotational element, wherein the sixth shaft is selectively connected to the transmission housing; and
a seventh shaft fixedly connected to the sixth rotational element and the twelfth rotational element, wherein the seventh shaft is selectively connected to the transmission housing;
wherein the input shaft and the first shaft are selectively interconnected to each other, the input shaft and the second shaft are selectively interconnected to each other, the first shaft and the fifth shaft are selectively interconnected to each other, and the first shaft and the sixth shaft are selectively interconnected to each other.
1 Assignment
0 Petitions
Accused Products
Abstract
A planetary gear train includes input and output shafts, and first to fourth planetary gear sets respectively having first to third, fourth to sixth, seventh to ninth, and tenth to twelfth elements. A first shaft is connected to the third element and selectively connected to the input shaft, a second shaft is connected to the ninth element and selectively connected to the input shaft, a third shaft is connected to the eleventh element and the output shaft, a fourth shaft is connected to the first, fourth, and seventh elements, and a fifth shaft is connected to the second and tenth elements. A plurality of shafts each selectively connect a corresponding element to a transmission housing, the corresponding element being an element of the second, third, and fourth planetary gear sets that is not interconnected.
41 Citations
15 Claims
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1. A planetary gear train of an automatic transmission for a vehicle, comprising:
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an input shaft for receiving an engine torque; an output shaft for outputting a shifted torque; a first planetary gear set having a first rotational element, a second rotational element, and a third rotational element; a second planetary gear set having a fourth rotational element, a fifth rotational element, and a sixth rotational element; a third planetary gear set having a seventh rotational element, an eighth rotational element, and a ninth rotational element; a fourth planetary gear set having a tenth rotational element, an eleventh rotational element, and a twelfth rotational element; a first shaft fixedly connected to the third rotational element and selectively connected to the input shaft; a second shaft fixedly connected to the ninth rotational element and selectively connected to the input shaft; a third shaft fixedly connected to the eleventh rotational element and fixedly connected to the output shaft; a fourth shaft fixedly connected to the first rotational element, the fourth rotational element, and the seventh rotational element; a fifth shaft fixedly connected to the second rotational element and the tenth rotational element; and a plurality of shafts each selectively connecting a corresponding element to a transmission housing, wherein the corresponding element is a rotational element, that is not fixedly interconnected, of one or more of the second planetary gear set, the third planetary gear sets, or the fourth planetary gear set; wherein the plurality of shafts comprises; a sixth shaft fixedly connected to the fifth rotational element and the eighth rotational element, wherein the sixth shaft is selectively connected to the transmission housing; and a seventh shaft fixedly connected to the sixth rotational element and the twelfth rotational element, wherein the seventh shaft is selectively connected to the transmission housing; wherein the input shaft and the first shaft are selectively interconnected to each other, the input shaft and the second shaft are selectively interconnected to each other, the first shaft and the fifth shaft are selectively interconnected to each other, and the first shaft and the sixth shaft are selectively interconnected to each other. - View Dependent Claims (2, 3, 4, 5)
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6. A planetary gear train of an automatic transmission for a vehicle, comprising:
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an input shaft for receiving an engine torque; an output shaft for outputting a shifted torque; a first planetary gear set having a first rotational element, a second rotational element, and a third rotational element; a second planetary gear set having a fourth rotational element, a fifth rotational element, and a sixth rotational element; a third planetary gear set having a seventh rotational element, an eighth rotational element, and a ninth rotational element; and a fourth planetary gear set having a tenth rotational element, an eleventh rotational element, and a twelfth rotational element; wherein the first rotational element is fixedly connected to the fourth rotational element and the seventh rotational element; wherein the second rotational element is fixedly connected to the tenth rotational element; wherein the third rotational element is selectively connected to the second rotational element, the eighth rotational element, and the input shaft, respectively; wherein the fifth rotational element is fixedly connected to the eighth rotational element, and selectively connected to a transmission housing; wherein the sixth rotational element is fixedly connected to the twelfth rotational element, and selectively connected to the transmission housing; wherein the ninth rotational element is selectively connected to the input shaft; and wherein the eleventh rotational element is fixedly connected to the output shaft. - View Dependent Claims (7, 8, 9, 10)
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11. A vehicle, comprising:
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an engine having a crankshaft; a driveshaft; an automatic transmission having an a planetary gear train disposed in a transmission housing, the planetary gear train comprising; an input shaft connected to the crankshaft; an output shaft connected to the driveshaft; a first planetary gear set having a first rotational element, a second rotational element, and a third rotational element; a second planetary gear set having a fourth rotational element, a fifth rotational element, and a sixth rotational element; a third planetary gear set having a seventh rotational element, an eighth rotational element, and a ninth rotational element; and a fourth planetary gear set having a tenth rotational element, an eleventh rotational element, and a twelfth rotational element; wherein the first rotational element is fixedly connected to the fourth rotational element and the seventh rotational element; wherein the second rotational element is fixedly connected to the tenth rotational element; wherein the third rotational element is selectively connected to the second rotational element, the eighth rotational element, and the input shaft, respectively; wherein the fifth rotational element is fixedly connected to the eighth rotational element, and selectively connected to the transmission housing; wherein the sixth rotational element is fixedly connected to the twelfth rotational element, and selectively connected to the transmission housing; wherein the ninth rotational element is selectively connected to the input shaft; and wherein the eleventh rotational element is fixedly connected to the output shaft. - View Dependent Claims (12, 13, 14, 15)
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Specification