Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Plural elements selectively braked
Reexamination Certificate
2007-09-11
2007-09-11
Le, David D. (Department: 3681)
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
Plural elements selectively braked
C475S271000, C475S275000, C475S277000, C475S284000, C475S288000, C475S296000, C475S313000, C475S325000, C475S330000
Reexamination Certificate
active
11054935
ABSTRACT:
An automatic transmission having a start-up clutch assembly includes a transmission housing, an input drive shaft, and an output drive shaft. An input planetary gear assembly is also included that has a sun gear and a ring gear, with a plurality of planet gears disposed therebetween, the ring gear operatively connected to the input drive shaft. A start-up clutch is operatively disposed between the transmission housing and the sun gear and is adapted to allow the sun gear to freely rotate when the start-up clutch is disengaged so that no torque is transferred. The start-up clutch is further adapted to engage and hold the sun gear stationary so that torque is fully transferred. The start-up clutch is further still adapted to provide a varying and controllable slipping interaction between the disengaged and engaged positions at vehicle start-up thereby providing the vehicle with a smooth transition from stationary to moving.
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“Transmission in vehicles” Conference: Jun. 19-20, 2001 “E-Automat Automatikgetriebe mit Esprit” Dr. P. Tenberge VDI, Chemnitz. VDI-Berichte, Nr.1610, 2001 pp. 455-479.
Bliss McGlynn P.C.
Borg-Warner Inc.
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