Multi-speed transmission

摘要

A transmission gearing arrangement includes four simple planetary gear sets arranged in two planes to reduce axial length. Six shift elements, including two input clutches, two output clutches, and two brakes, are engaged in combinations of three to establish nine forward speed ratios and one reverse speed ratio. The two output clutches may be assembled into a module suitable for testing before installation.

主权项

1. A transmission comprising:
a first planetary gearset having a first sun fixedly held against rotation, a first ring, and a first carrier; a second planetary gearset having a second sun fixedly coupled to the first ring, a second ring, and a second carrier fixedly coupled to an input; a third planetary gearset having a third sun, a third ring, and a third carrier fixedly coupled to the first ring; and a fourth planetary gearset having a fourth sun, a fourth ring fixedly coupled to the third sun, and a fourth carrier fixedly coupled to the first ring; a first clutch configured to selectively couple the first carrier to an output; and a second clutch configured to selectively couple the second ring to the output.