Multi-speed automatic transmission for private cars or commercial vehicles
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United States of America Patent
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Apr 20, 2010
Issued Date -
N/A
app pub date -
May 20, 2005
filing date -
May 21, 2004
priority date (Note) -
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Abstract
A multi-speed automatic transmission for private cars or commercial vehicles includes input and output shafts, two power paths, a double planetary gear train, first and second brakes. The first power path has a first speed ratio and includes first and second clutches. The second power path has a second speed ratio, which is greater than the first speed ratio and in the same direction, with third and fourth clutches. The transmission has eight forward and two reverse speeds and is highly flexible. In one embodiment, the transmission is reduced to six forward and one reverse speed without the second clutch. In another embodiment, the input and output shafts are aligned and the ratios are supplied respectively by a planetary gear train and a direct drive. In another embodiment, the input and output shafts are parallel and the ratios are supplied respectively by two parallel gear trains including constant mesh gears.
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