Multi-speed transmission
First Claim
Patent Images
1. 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;
a second gearing arrangement configured to selectively impose a linear speed relationship among the first shaft, the input, and the output; and
a first clutch configured to selectively directly couple the output to one of the first shaft and the input.
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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 speed ratios 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.
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Citations
12 Claims
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1. A transmission comprising:
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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; a second gearing arrangement configured to selectively impose a linear speed relationship among the first shaft, the input, and the output; and a first clutch configured to selectively directly couple the output to one of the first shaft and the input. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transmission comprising:
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a first gearing arrangement configured to fixedly constrain first and second shafts to rotate slower than an input; and a Ravigneaux gearset having a Ravigneaux carrier selectively coupled to the first shaft and selectively held against rotation, a first Ravigneaux sun selectively coupled to the second shaft and selectively held against rotation, a second Ravigneaux sun selectively coupled to the second shaft, and a Ravigneaux ring. - View Dependent Claims (9, 10, 11, 12)
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Specification