Planetary transmissions having a stationary fixed interconnection and providing at least eight speed ratios
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United States of America Patent
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Sep 12, 2006
Grant Date -
Mar 23, 2006
app pub date -
Sep 23, 2004
filing date -
Sep 23, 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 two interconnecting members, one of which is grounded. The powertrain includes an engine that is selectively connectable 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 input shaft and the transmission housing, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.
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