Multi-speed transmission
AssigneeFord Global Technologies, LLC
InventorDonald Edward Hoffman
Life of this patent
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Abstract
A family of transmission gearing arrangements each establish at least one reverse gear ratio and between nine and fifteen forward gear ratios. A shiftable gearing arrangement establishes a variety of gear ratios speed ratio between the input and a first shaft. In some embodiments, a fixed speed ratio is established upstream or downstream of the shiftable gearing arrangement. In reverse and low gear ratios, a low clutch couples the first shaft to the output. In the high gear ratios, a combining planetary gear set establishes a linear speed relationship between the first shaft, a second shaft rotating at a speed proportional to the input, and the output.
Claims28
A transmission comprising:
- an input;
- an output;
- a first gearing arrangement configured to impose a plurality of selective proportional speed relationships between the input and a first shaft;
- and
- a second gearing arrangement configured to i) impose a linear speed relationship among the first shaft, a second shaft, and the output, ii) selectively couple the first shaft to the output, and iii) impose a proportional speed relationship between the input and the second shaft.
A transmission comprising:
- an input;
- an output;
- a first shaft;
- a first gearing arrangement configured to impose a plurality of selective proportional speed relationships between the first shaft and the input;
- and
- a second gearing arrangement configured to i) selectively impose a linear speed relationship among the first shaft, the input, and the output, and ii) selectively couple the first shaft to the output.
A transmission comprising:
- an output;
- first, second, third, fourth, fifth, sixth, and seventh shafts;
- a first gearing arrangement configured to impose fixed proportional speed relationships between the first, second, and third shafts such that the third shaft rotates faster than the second shaft and the second shaft rotates faster than the first shaft;
- a second gearing arrangement configured to impose a fixed linear speed relationship among the fourth, fifth, sixth, and seventh shafts;
- a third gearing arrangement configured to selectively impose a linear speed relationship among the sixth shaft, the third shaft, and the output;
- a first brake configured to selectively hold the fourth shaft against rotation;
- a second brake configured to selectively hold the fifth shaft against rotation;
- a first clutch configured to selectively couple the first shaft to the fourth shaft;
- a second clutch configured to selectively couple the first shaft to the seventh shaft;
- a third clutch configured to selectively couple the second shaft to the fifth shaft;
- and
- a low clutch configured to selectively couple the sixth shaft to the output.
Dependencies are inferred from the claim text.