Multiple-speed automatic transmission having a two-speed...

Details Multiple-speed automatic transmission having a two-speed... Multiple-speed automatic transmission having a two-speed...

2007-06-26

2007-06-26

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S288000

Reexamination Certificate

active

11203704

ABSTRACT:
A multi-speed automatic transmission includes an input and output, first, second and three planetary gear units, each gear unit including a sun gear, a ring gear, planet pinions meshing with the sun gear and the ring gear, and a carrier rotatably supporting the planet pinions. A first brake alternately holds against rotation and releases the sun gear of the second gear unit and the sun gear of the third gear unit. A second brake alternately holds and releases the carrier of the second gear unit. A first clutch alternately connects and disconnects the carrier of the first gear unit and the ring gear of the third gear unit. A second clutch alternately disconnects and connects the carrier of the first gear unit to the sun gears of the second gear unit and third gear unit. A third clutch alternately releases and connects the input and ring gear of the first gear unit to the carrier of the second gear unit.

REFERENCES:
patent: 5106352 (1992-04-01), Lepelletier
patent: 5951432 (1999-09-01), Wehking et al.
patent: 6165097 (2000-12-01), Hebbale et al.
patent: 6663529 (2003-12-01), Haka
patent: 6786845 (2004-09-01), Haka
patent: 2003/0114266 (2003-06-01), Bauer
patent: 2007/0037657 (2007-02-01), Thomas et al.
patent: 2240433 (1990-09-01), None

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