Planetary gear transmission systems or components – Nonplanetary variable speed or direction transmission... – Plural power paths to planetary gearing
Reexamination Certificate
2009-06-03
2011-11-29
Le, David D (Department: 3655)
Planetary gear transmission systems or components
Nonplanetary variable speed or direction transmission...
Plural power paths to planetary gearing
C475S207000, C475S302000, C074S330000, C074S331000
Reexamination Certificate
active
08066606
ABSTRACT:
A multi-group transmission of a vehicle is arranged in a drivetrain and includes traction force support during gearshift operations. A clutch mechanism, including a frictional clutch and two shifting clutches is arranged between a drive motor with a driveshaft and a transmission input shaft, such that the driveshaft can be connected to the transmission input shaft by one shifting clutch in a first shift position in combination with the frictional clutch or in a second shift position with bridging of the frictional clutch, such that the driveshaft can be directly connected to a main transmission shaft by the other shifting clutch in a shift position in active combination with the frictional clutch. In a method for operating the transmission, the frictional clutch is controlled and operated in combination with the first shifting clutch as a starting clutch and with the second shifting clutch as an intermediate-gear clutch.
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Dittrich Alan
Hoffmann Rayk
Davis & Bujold P.L.L.C.
Gonzalez Michael
Le David D
ZF Friedrichshafen AG
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