Gear train of an automatic transmission for a vehicle

Details Gear train of an automatic transmission for a vehicle Gear train of an automatic transmission for a vehicle

2009-03-05

2009-11-24

Le, David D (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S275000, C475S330000

Reexamination Certificate

active

07621841

ABSTRACT:
An eight speed gear train of an automatic transmission includes first and second planetary gear sets as simple planetary gear sets, a third planetary gear set as a compound planetary gear set, and a plurality of friction members. The first planetary gear set reduces engine speed from an input shaft through a first input path and outputs the reduced speed through a first intermediate output path. The second planetary gear set receives the reduced speed through first and second intermediate input paths, and outputs a further reduced speed or a reversed speed through a second intermediate output path. The third planetary gear set selectively receives the engine speed from the input shaft through a second input path, selectively receives input speeds from the first and second planetary gear sets through third and fourth intermediate input paths, and outputs a plurality of speeds through a final output path.

REFERENCES:
patent: 5098357 (1992-03-01), Asada et al.
patent: 6634980 (2003-10-01), Ziemer
patent: 7172527 (2007-02-01), Abe et al.
patent: 7311634 (2007-12-01), Shim
patent: 7452303 (2008-11-01), Seo
patent: 2004/0097324 (2004-05-01), Ziemer
patent: 2006-125585 (2006-05-01), None

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