Automatic transmission

Details Automatic transmission Automatic transmission

2011-03-22

2011-03-22

Wright, Dirk (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

Reexamination Certificate

active

07909725

ABSTRACT:
An automatic transmission includes a first planetary gear set; a second planetary gear set; a third planetary gear set; and at least five friction elements. The at least five friction elements includes a first clutch adapted to selectively connect a first carrier with a second carrier; a first brake adapted to selectively stop a rotation of the second carrier; a second brake adapted to selectively stop a rotation of a rotating member having a first sun gear, a second ring gear, and a third carrier; a third brake adapted to selectively stop a rotation of a third sun gear; and a second clutch adapted to selectively connect the first carrier with a second sun gear. Each of at least seven forward speed-ratios and one reverse speed-ratio is achieved by engaging two friction elements selected from the first and second clutches and the first to third brakes.

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