Gm Global Technolgoy Operations, Inc.

Tyng Liu

John D Malloy

The present invention is directed to a five-speed, epicyclic transmission assembly having a compound planetary gear set encased in a common housing. Each planetary gear set has a sun gear and a ring gear. A plurality of pinion gears are operatively supported from a common carrier. The sun gears and ring gears of the two planetary gear sets are compounded by the operation of the pinion gears presented from the common carrier. Six, torque transfer devices are utilized. At least two of the torque transfer devices are input clutch members which selectively connect the input means to predetermined components of the planetary gear sets, and at least two of the torque transfer devices are reaction brake members that selectively ground predetermined components of the planetary gear sets to the housing. The sun gear in one of said planetary gear sets may be operatively connected to at least one of the input clutch members. The sun gear in the other planetary gear set is operatively connected to at least one of the input clutch member as well as to one of said reaction brake member. The carrier is operatively connected to one of the clutch member and one of said reaction brake members, and the ring gear in one of said planetary gear sets is connected to the output shaft.

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Taipei, Taiwan

Tyng Liu