MULTI-SPEED TRANSMISSION
First Claim
Patent Images
1. A transmission comprising:
- an input shaft supported for rotation about a first axis;
an output shaft supported for rotation about a second axis, the second axis parallel to the first axis;
first, second, and third shafts supported for rotation about the second axis;
a first gearing arrangement configured to fixedly impose a linear speed relationship among the first shaft, the second shaft, the output shaft, and the third shaft;
a second gearing arrangement configured to selectively impose a first fixed speed ratio between the second shaft and the input shaft;
a third gearing arrangement configured to selectively impose a plurality of fixed speed ratios between the first shaft and the input shaft; and
a first brake configured to selectively hold the third shaft against rotation.
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Abstract
A transmission gearing arrangement produces nine forward speed ratios and one reverse speed ratio by selective engagement of three shift elements in various combinations. Two planetary gear sets are configured to rotate about an input axis while two planetary gear sets are configured to rotate about a second axis. Power is transferred from the input axis to the second axis by two pairs of axis transfer gears. The output element is located on the second axis.
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Citations
23 Claims
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1. A transmission comprising:
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an input shaft supported for rotation about a first axis; an output shaft supported for rotation about a second axis, the second axis parallel to the first axis; first, second, and third shafts supported for rotation about the second axis; a first gearing arrangement configured to fixedly impose a linear speed relationship among the first shaft, the second shaft, the output shaft, and the third shaft; a second gearing arrangement configured to selectively impose a first fixed speed ratio between the second shaft and the input shaft; a third gearing arrangement configured to selectively impose a plurality of fixed speed ratios between the first shaft and the input shaft; and a first brake configured to selectively hold the third 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 shaft supported for rotation about a first axis; an output shaft supported for rotation about a second axis, the second axis parallel to the first axis; first and second shafts supported for rotation about the second axis; a third shaft supported for rotation about the first axis; a first gearing arrangement configured to fixedly impose a linear speed relationship among the first shaft, the second shaft, and the output shaft; a second gearing arrangement configured to selectively constrain the second shaft to rotate faster than the output shaft and in a same direction; a third gearing arrangement configured to selectively impose a first fixed speed ratio between the second shaft and the input shaft; a fourth gearing arrangement configured to fixedly impose a second fixed speed ratio between the first shaft and the third shaft; and a fifth gearing arrangement configured to selectively impose a plurality of fixed speed ratios between the third shaft and the input shaft. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A transmission comprising:
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an input shaft supported for rotation about a first axis; an output shaft supported for rotation about a second axis, the second axis parallel to the first axis; a first axis transfer gear fixedly coupled to the input shaft; a second axis transfer gear supported for rotation about the second axis and in continuous meshing engagement with the first axis transfer gear; a third axis transfer gears supported for rotation about the first axis; a fourth axis transfer gear supported for rotation about the second axis and in continuous meshing engagement with the third axis transfer gear; a first gearing arrangement configured to selectively constrain the fourth axis transfer gear to rotate faster than the output shaft and in a same direction; a second gearing arrangement configured to selectively impose a linear speed relationship among the fourth axis transfer gear, the second axis transfer gear, and the output shaft; and a third gearing arrangement configured to selectively impose a plurality of fixed speed ratios between the third axis transfer gear and the input shaft. - View Dependent Claims (20, 21, 22, 23)
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Specification