Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Plural elements selectively braked
Reexamination Certificate
2007-05-21
2009-10-20
Pang, Roger (Department: 3655)
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
Plural elements selectively braked
C475S288000
Reexamination Certificate
active
07604563
ABSTRACT:
A multi-speed transmission includes multiple planetary gear sets having members representable by a three-node lever and a five-node lever, with each node representing at least one of the members of the planetary gear sets. The transmission includes seven torque-transmitting mechanisms including three rotating clutches selectively connecting nodes of the three-node lever to nodes of the five-node lever, one rotating clutch selectively connecting the input member with a node of the five-node lever and three brakes grounding selective nodes of the five-node lever to a stationary member. The torque-transmitting mechanisms are engagable in different combinations to provide at least eight forward speed ratios and a reverse speed ratio between an input member and an output member, and there are preferably five alternate forward speed ratios such that there are five different combinations of nine forward speed ratios operable in progression with single-transition shifts between each forward speed ratio.
REFERENCES:
patent: 5106352 (1992-04-01), Lepelletier
patent: 6887178 (2005-05-01), Miyazaki et al.
patent: 6910985 (2005-06-01), Ishimaru et al.
patent: 2005/0003924 (2005-01-01), Tabata et al.
patent: 2008/0039267 (2008-02-01), Shim
GM Global Technology Operations Inc.
Pang Roger
LandOfFree
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