Planetary transmissions with three interconnected gear sets and a stationary member
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United States of America Patent
Stats
-
Jun 1, 2004
Grant Date -
Mar 18, 2004
app pub date -
Sep 13, 2002
filing date -
Sep 13, 2002
priority date (Note) -
In Force
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 seven forward speed ratios and at least one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and a fixed interconnection. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is not continuously connected with any of the planetary gear members and an output member that is continuously connected with one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, the input shaft, the output shaft, and with the transmission housing, and are operated in combinations of three to establish at least seven forward speed ratios and one reverse speed ratio.
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