MULTI-SPEED TRANSMISSION

摘要

A transmission gearing arrangement has four simple planetary gear sets and five or six shift elements. One embodiment has two brakes and three clutches and produces eight speeds by selective engagement of various combinations of three of the shift elements. A second embodiment has two brakes and four clutches and produces nine speeds by selective engagement of various combinations of four of the shift elements. A third embodiment has two brakes and four clutches and produces ten speeds by selective engagement of various combinations of four of the shift elements.

主权项

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