MULTI-SPEED TRANSMISSION

摘要

A transmission gearing arrangement produces eleven 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. Each of these embodiments may include a one way brake such that the first shift is non-synchronous. A third embodiment includes four simple planetary gear sets, four brakes, and two clutches.

主权项

1. A transmission comprising:
an input; an output; first, second, third, fourth, and fifth shafts; a first gearing arrangement configured to fixedly impose a linear speed relationship among the first shaft, the second shaft, the third shaft, and the fourth shaft; a second gearing arrangement configured to selectively impose a proportional speed relationship between the second shaft and the output; a third gearing arrangement configured to fixedly impose a linear speed relationship among the second shaft, the input, and the fifth shaft; a fourth gearing arrangement configured to selectively impose a proportional speed relationship between the fifth shaft and the output; a first brake configured to selectively hold the third shaft against rotation; a second brake configured to selectively hold the fourth shaft against rotation; a first clutch configured to selectively couple the input to the third shaft; and a second clutch configured to selectively couple the input to the fourth shaft.