Automatic transmission

Details Automatic transmission Automatic transmission

1987-12-01

1990-06-19

Bonck, Rodney H.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

F16H 5710

Patent

active

049342150

ABSTRACT:
An automatic transmission comprising a single planetary gear unit and a dual planetary gear unit has an output member located in its center so that the output member encloses an input shaft.
In the case of a three speed automatic transmission mechanism, a first clutch located around a ring gear of the single planetary gear unit connects the input shaft to this ring gear.
In the case of a four speed automatic transmission mechanism, a third clutch which actuates overdrive is additionally located axially outside the first clutch for connecting the input member to a ring gear of the dual planetary gear unit.
A sun gear common to both planetary units is connected to the input shaft by a second clutch. This clutch has a drum portion upon which a band may act to brake the sun gear.

REFERENCES:
patent: 2220174 (1940-11-01), Ravigneaux
patent: 3164034 (1965-01-01), Kelley
patent: 3877320 (1975-04-01), Iijima
patent: 4711138 (1987-12-01), Miura et al.
patent: 4716787 (1988-01-01), Miura et al.

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