9-speed transmission
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United States of America Patent
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Jun 15, 2010
Grant Date -
Feb 19, 2009
app pub date -
Aug 15, 2007
filing date -
Aug 15, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The transmission has a plurality of members that can be utilized in powertrains to provide nine forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets, six torque-transmitting devices and four fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of three to establish nine forward speed ratios and one reverse speed ratio.
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