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US 9,175,748 B2Granted
Multi-speed transmission
AssigneeFord Global Technologies, LLC
InventorsGregory Daniel Goleski, Donald Edward Hoffman, Robert Scott Lippert
Life of this patent
Estimating the term…
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.
Claims19
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.
9 more elements
A transmission comprising:
- 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.
9 more elements
A transmission comprising:
- 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.
4 more elements
Dependencies are inferred from the claim text.