Planetary gear transmission systems or components – Nonplanetary variable speed or direction transmission... – Nonplanetary transmission is friction gearing
Reexamination Certificate
2007-12-25
2007-12-25
Lewis, Tisha (Department: 3681)
Planetary gear transmission systems or components
Nonplanetary variable speed or direction transmission...
Nonplanetary transmission is friction gearing
C475S218000, C475S201000, C475S302000, C475S303000
Reexamination Certificate
active
11302959
ABSTRACT:
A transmission is provided having a differential gear set with three input torque-transmitting mechanisms, such as friction clutches, to achieve torque flow through the differential gear set to a countershaft gearing arrangement. The transmission utilizes power-on shifts. By utilizing the torque ratio of the differential gear set, additional forward ratios are available with good step progression, reducing the number of countershaft gear sets and synchronizers necessary in comparison to a dual-clutch transmission providing the same number of ratios. A shorter axial length is thus attainable.
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patent: 7163483 (2007-01-01), Haka
patent: WO 99/15810 (1999-04-01), None
GM Global Technology Operations Inc.
Lewis Tisha
LandOfFree
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