Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Plural elements selectively braked
Reexamination Certificate
2005-02-08
2005-02-08
Pang, Roger (Department: 3681)
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
Plural elements selectively braked
Reexamination Certificate
active
06852059
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 input clutches, eight torque transmitting mechanisms, two fixed interconnections, and one grounded planetary gear member. The invention provides a low content multi-speed dual clutch transmission mechanism wherein the input clutches alternately connect the engine to realize odd and even number speed ratio ranges. 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 three to establish at least six forward speed ratios and at least one reverse speed ratio. Further, two of the torque transmitting mechanisms and one of the input clutches may be replaced with two input clutches, thereby reducing content.
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Lee Chunhao J.
Usoro Patrick Benedict
General Motors Corporation
Marra Kathryn A.
Pang Roger
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