Eight-speed transmissions with four planetary gear sets
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United States of America Patent
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Jan 16, 2007
Issued Date -
N/A
app pub date -
Jan 24, 2005
filing date -
Jan 24, 2005
priority date (Note) -
In Force
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Abstract
Eight-speed transmissions are provided that include four planetary gear sets having seven torque-transmitting mechanisms and various fixed interconnections to provide eight forward speed ratios and at least one reverse speed ratio. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another of the planetary gear members. The seven torque-transmitting mechanisms are operated in combinations of two. Reduced component speeds and improved ratios are achieved.
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Family
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