Multi-speed transmission

摘要

A transmission gearing arrangements produces up to ten forward and one reverse speed ratios by selective engagement of various combinations of four shift elements. Each disclosed transmission includes four planetary gear sets and at least six shift elements. One of the shift elements may be a dog clutch. Optional passive one way brakes simplify the control.

主权项

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