8-speed transmission
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United States of America Patent
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Mar 16, 2010
Grant Date -
Oct 23, 2008
app pub date -
Oct 5, 2007
filing date -
Apr 20, 2007
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 at least eight forward speed ratios and at least one reverse speed ratio. The transmission includes four planetary gear sets having five torque-transmitting devices, four fixed interconnections and a grounded member. 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 five torque-transmitting devices provide interconnections between various gear members, and with a stationary member, 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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