MULTI-SPEED TRANSMISSION

摘要

A transmission gearing arrangement produces nine forward speed ratios and one reverse speed ratio by selective engagement of three shift elements in various combinations. Some embodiments includes four simple planetary gear sets and six shift elements of which two may be brakes. Other alternative embodiments may additionally include a third brake.

主权项

1. A transmission comprising:
a first gearing arrangement configured to fixedly impose a linear speed relationship among first, second, third, and fourth shafts; a second gearing arrangement configured to selectively constrain the fourth shaft to rotate faster than an input shaft and in a same direction; and a third gearing arrangement configured to selectively impose a linear speed relationship among the input shaft, an output shaft, and the second shaft.