Power train of automatic transmission

Details Power train of automatic transmission Power train of automatic transmission

2006-10-31

2008-11-25

Pang, Roger (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S276000, C475S278000, C475S313000

Reexamination Certificate

active

07455614

ABSTRACT:
A power train of an automatic transmission that realizes seven forward speeds and two reverse speeds includes a first planetary gear set a second planetary gear set; a third planetary gear set an input shaft; an output gear; and a transmission case. A third planet carrier is fixedly connected to a first ring gear, a second ring gear is fixedly connected to the a planet carrier, a long-pinion-side ring gear acts as an input element by being fixedly connected to the input shaft, and a second planet carrier acts as an output element by being fixedly connected to the output gear. Also, a second ring gear is variably connected to the input shaft via a first clutch, a first sun gear is variably connected to the first planet carrier via a second clutch, the second sun gear is variably connected to the first sun gear via a third clutch, and the short-pinion-side ring gear is variably connected to the transmission case via a first brake.

REFERENCES:
patent: 4823641 (1989-04-01), Kuhn et al.
patent: 5112285 (1992-05-01), Hall, III
patent: 6302820 (2001-10-01), Ried
patent: 7384364 (2008-06-01), Jang
patent: 2005/0113205 (2005-05-01), Oguri et al.

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