Multi-speed dual-clutch planetary transmission mechanisms having three interconnecting members
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United States of America Patent
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Jun 1, 2004
Grant Date -
May 27, 2004
app pub date -
Nov 25, 2002
filing date -
Nov 25, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least six forward speed ratios and one reverse speed ratio. The transmission family members include four planetary gear sets, two or three input clutches, seven, eight or nine torque transmitting mechanisms and three fixed interconnections. The invention provides a low content multi-speed dual clutch transmission mechanism wherein the two input clutches alternately connect the engine to realize odd and even speed ratio changes. The torque transmitting mechanisms provide connections between various gear members, the fixed interconnections, the input clutches, the output shaft, and the transmission housing, and are operated in combinations of at least three to establish at least five forward speed ratios and at least one reverse speed ratio.
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