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US 2014/0235399 A1Published application
Multi-speed transmission
AssigneeFord Global Technologies, LLC
InventorGregory Daniel Goleski
Life of this patent
Estimating the term…
Abstract
A transmission gearing arrangement produces at least nine 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, three clutches, and three brakes. Another embodiment includes four axis transfer gear pairs, two simple planetary gear sets, five clutches, and one brake.
Claims25
A transmission comprising:
- first, second, third, fourth, and fifth shafts;
- a first gearing arrangement configured to selectively constrain the first shaft to rotate faster than the fourth shaft and in a same direction;
- a second gearing arrangement configured to fixedly impose a linear speed relationship among the first shaft, the second shaft, and the third shaft;
- a third gearing arrangement configured to selectively impose a linear speed relationship among the third shaft, the fourth shaft, and the fifth shaft;
- a fourth gearing arrangement configured to selectively constrain the third shaft to rotate faster than the fifth shaft and in a same direction;
- a first brake configured to selectively hold the second shaft against rotation;
- a first clutch configured to selectively couple the second shaft to the fourth shaft;
- and
- a second clutch configured to selectively couple the first shaft to the third shaft.
6 more elements
A transmission comprising:
- first, second, third, and fourth shafts;
- a first gearing arrangement configured to selectively establish one of a plurality of speed ratios between the second shaft and the first shaft;
- a second gearing arrangement configured to selectively impose a linear speed relationship among the second shaft, the first shaft, and the third shaft;
- a first gear fixedly coupled to the third shaft;
- a second gear fixedly coupled to the fourth shaft and in continuous meshing engagement with the first gear;
- a third gear coupled to the second shaft;
- and
- a fourth gear coupled to the fourth shaft and in continuous meshing engagement with the third gear.
5 more elements
Dependencies are inferred from the claim text.