Power train of automatic transmission

Details Power train of automatic transmission Power train of automatic transmission

2006-10-31

2009-02-03

Marmor, Charles A (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S330000, C475S275000

Reexamination Certificate

active

07485069

ABSTRACT:
A power train of an automatic transmission includes a Ravigneaux planetary gear set having a Ravigneaux ring gear, which always acts as an output member; a Ravigneaux planet carrier; and first and second Ravigneaux sun gears. The power train further includes a simple planetary gear set including an input member connected to an input shaft, a member fixedly connected to the Ravigneaux planet carrier, and a member variably connected to the Ravigneaux ring gear. The power train further includes a first brake variably stopping the Ravigneaux planet carrier, a second brake variably stopping the first Ravigneaux sun gear, a first clutch rotating the simple planetary gear set, a second clutch variably connecting the second Ravigneaux sun gear to the input shaft, a third clutch variably connecting the first Ravigneaux sun gear to the input shaft, and a fourth clutch variably connecting the variably connected member to the Ravigneaux ring gear.

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