Wide ratio transmissions having three planetary gear sets and three brakes
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United States of America Patent
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Jan 24, 2006
Grant Date -
Sep 29, 2005
app pub date -
Mar 24, 2004
filing date -
Mar 24, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least eight forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having seven torque-transmitting mechanisms and three fixed interconnections. 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 one of the planetary gear members. The seven torque-transmitting mechanisms provide interconnections between various gear members and the transmission housing, and are operated in combinations of two to establish at least eight forward speed ratios and at least one reverse speed ratio.
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