9-speed transmission
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United States of America Patent
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-
May 24, 2011
Grant Date -
Aug 6, 2009
app pub date -
Jan 31, 2008
filing date -
Jan 31, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
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 having six torque-transmitting devices and four 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 six torque-transmitting devices provide interconnections between various gear members, the transmission housing and with the input member, and are operated in combinations to establish at least nine forward speed ratios and at least one reverse speed ratio.
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