Wide ratio transmissions with three interconnected planetary gear members
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United States of America Patent
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-
Sep 20, 2005
Grant Date -
Jun 16, 2005
app pub date -
Dec 16, 2003
filing date -
Dec 16, 2003
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 two fixed interconnecting members. 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, the fixed interconnections, the input shaft, the output shaft, 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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