Automatic transmission

Details Automatic transmission Automatic transmission

2006-05-30

2006-05-30

Lewis, Tisha D. (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S313000, C475S325000

Reexamination Certificate

active

07052431

ABSTRACT:
An automatic transmission, which has at least six selectable forward speeds, includes a reduction planetary gearset that reduces speed of rotation input from an engine, a plurality of planetary gearsets disposed behind the reduction planetary gearset, a plurality of clutches that are disposed radially beyond the plurality of planetary gearsets, and a plurality of brakes that are disposed radially beyond the plurality of clutches. The plurality of planetary gearsets includes a ring gear as an input member that inputs reduced rotation from the reduction planetary gearset. Individually, planetary gearsets include a single set of pinion gears. The forward speeds of the transmission are selectable through a combination of engagement and disengagement of the plurality of clutches and the plurality of brakes. Each brake overlaps with a corresponding clutch in the axial direction.

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