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 fixed linear speed relationship among the first shaft, the second shaft, and the third shaft;
a second gearing arrangement configured to impose a fixed linear speed relationship among the fourth shaft, the third shaft, and the second shaft;
a third gearing arrangement configured to impose a fixed linear speed relationship among the third shaft, the input, and the fifth shaft;
a fourth gearing arrangement configured to selectively constrain the output to rotate at a first speed ratio relative to the third shaft;
a fifth gearing arrangement configured to selectively constrain the output to rotate at a second speed ratio relative to the fifth shaft, the second speed ratio having an absolute value greater than an absolute value of the first speed ratio;
a first clutch configured to selectively couple the fourth shaft to the input;
a second clutch configured to selectively couple the first shaft to the input;
a first brake configured to selectively hold the first shaft against rotation; and
a second brake configured to selectively hold the second shaft against rotation.
1 Assignment
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Accused Products
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, four clutches, and two brakes. Another embodiment includes two axis transfer gear pairs, three simple planetary gear sets, four clutches, and two brakes.
73 Citations
20 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 fixed linear speed relationship among the first shaft, the second shaft, and the third shaft; a second gearing arrangement configured to impose a fixed linear speed relationship among the fourth shaft, the third shaft, and the second shaft; a third gearing arrangement configured to impose a fixed linear speed relationship among the third shaft, the input, and the fifth shaft; a fourth gearing arrangement configured to selectively constrain the output to rotate at a first speed ratio relative to the third shaft; a fifth gearing arrangement configured to selectively constrain the output to rotate at a second speed ratio relative to the fifth shaft, the second speed ratio having an absolute value greater than an absolute value of the first speed ratio; a first clutch configured to selectively couple the fourth shaft to the input; a second clutch configured to selectively couple the first shaft to the input; a first brake configured to selectively hold the first shaft against rotation; and a second brake configured to selectively hold the second shaft against rotation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A transmission comprising:
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an input configured to rotate about an input axis; an output configured to rotate about an output axis offset from the input axis; a first simple planetary gear set having a first sun gear, a first ring gear, a first planet carrier coupled to the input, and at least one planet gear supported for rotation on the first planet carrier and in continuous meshing engagement with the first sun gear and the first ring gear; a first axis transfer gear coupled to the first sun gear; a second axis transfer gear coupled to the output and in continuous meshing engagement with the first axis transfer gear; a third axis transfer gear fixedly coupled to the first ring gear; a fourth axis transfer gear coupled to the output and in continuous meshing engagement with the third axis transfer gear; and a first gearing arrangement configured to selectively impose a plurality of fixed speed ratios between the input and the first sun gear. - View Dependent Claims (14, 15, 16, 17)
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18. A transmission comprising:
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a simple planetary gear set having a sun, a ring, and a carrier fixedly coupled to an input; first and second axis transfer gears coupled to the sun and ring respectively; third and fourth axis transfer gears coupled to an output and meshing with the first and second gears respectively; and a gearing arrangement configured to selectively impose a plurality of fixed speed ratios between the input and the sun. - View Dependent Claims (19, 20)
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Specification