Multi-speed transmission
First Claim
Patent Images
1. A transmission comprising:
- an input;
an output;
first, second, third, fourth, and fifth shafts;
a first gearing arrangement configured to impose a first fixed linear speed relationship among the first shaft, the second shaft, the third shaft, and the fourth shaft;
a second gearing arrangement configured to impose a first selective proportional speed relationship between the second shaft and the output;
a third gearing arrangement configured to impose a second fixed linear speed relationship among the second shaft, the input, and the fifth shaft;
a fourth gearing arrangement configured to impose a second selective proportional speed relationship between the fifth shaft and the output;
a first brake configured to selectively hold the third shaft against rotation;
a second brake configured to selectively hold the fourth shaft against rotation;
a first clutch configured to selectively couple the input to the third shaft; and
a second clutch configured to selectively couple the input to the fourth shaft.
1 Assignment
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Accused Products
Abstract
A transmission gearing arrangement produces eleven forward speed ratios and one reverse speed ratio by selective engagement of three shift elements in various combinations. One embodiment includes four simple planetary gear sets, four clutches, and two brakes. Another embodiment includes two axis transfer gear pairs, three simple planetary gear sets, four clutches, and two brakes. Each of these embodiments may include a one way brake such that the first shift is non-synchronous. A third embodiment includes four simple planetary gear sets, four brakes, and two clutches.
65 Citations
19 Claims
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1. A transmission comprising:
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an input; an output; first, second, third, fourth, and fifth shafts; a first gearing arrangement configured to impose a first fixed linear speed relationship among the first shaft, the second shaft, the third shaft, and the fourth shaft; a second gearing arrangement configured to impose a first selective proportional speed relationship between the second shaft and the output; a third gearing arrangement configured to impose a second fixed linear speed relationship among the second shaft, the input, and the fifth shaft; a fourth gearing arrangement configured to impose a second selective proportional speed relationship between the fifth shaft and the output; a first brake configured to selectively hold the third shaft against rotation; a second brake configured to selectively hold the fourth shaft against rotation; a first clutch configured to selectively couple the input to the third shaft; and a second clutch configured to selectively couple the input to the fourth shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transmission comprising:
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an input; an output; first, second, third, and fourth shafts; a first gearing arrangement configured to impose a first fixed linear speed relationship among the first shaft, the second shaft, and the third shaft; a second gearing arrangement configured to impose a first selective proportional speed relationship between the first shaft and the output; a third gearing arrangement configured to impose a second fixed linear speed relationship among the first shaft, the input, and the fourth shaft; a fourth gearing arrangement configured to impose a second selective proportional speed relationship between the fourth shaft and the output; a first brake configured to selectively hold the second shaft against rotation; a second brake configured to selectively hold the third shaft against rotation; a first clutch configured to selectively couple the input to the second shaft; and a second clutch configured to selectively couple the input to the third shaft. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A transmission comprising:
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an input; an output; an intermediate shaft; a first gearing arrangement configured to selectively impose at least four distinct positive proportional speed ratios between the input and the intermediate shaft, the first gearing arrangement comprising a passive shift element that engages to transmit torque from the input to the intermediate shaft in a highest of the positive proportional speed ratios and overruns in a remainder of the positive proportional speed ratios; a first simple planetary gear set having a first sun gear fixedly coupled to the intermediate shaft, a first ring gear selectively held against rotation, a first planet carrier fixedly coupled to the output shaft, and a first plurality of planet gears each supported for rotation with respect to the first planet carrier and in continuous meshing engagement with both the first sun gear and the first ring gear; and a second simple planetary gear set having a second sun gear fixedly coupled to the intermediate shaft, a second ring gear selectively coupled to the output shaft, a second planet carrier fixedly coupled to the input shaft, and a second plurality of planet gears each supported for rotation with respect to the second planet carrier and in continuous meshing engagement with both the second sun gear and the second ring gear. - View Dependent Claims (19)
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Specification