Automatic transmission
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United States of America Patent
Stats
-
Jun 19, 1990
Grant Date -
N/A
app pub date -
Dec 1, 1987
filing date -
Dec 9, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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