8-speed automatic transmission for a vehicle
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United States of America Patent
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Aug 24, 2010
Grant Date -
Nov 13, 2008
app pub date -
Dec 4, 2007
filing date -
May 8, 2007
priority date (Note) -
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Abstract
An eight-speed automatic transmission for a vehicle includes a single pinion planetary gear set, a double pinion planetary gear set, a compound planetary gear set, a first clutch, a second clutch, a third clutch, a fourth clutch, a first brake, a second brake, and a one-way clutch. The second clutch and the fourth clutch are disposed between the double pinion planetary gear set and the compound planetary gear set, and a center supporter is formed between the second clutch and the fourth clutch for smoothly supplying hydraulic pressure to the second clutch and the fourth clutch. Therefore, an input shaft may have a small diameter.
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