Patent ID: 6827664
Filing Date: 2004-12-07
Classification: F16H

Abstract:
A power transmission for use in a powertrain having an engine for providing rotary power in a first direction to said power transmission, said power transmission comprising:an input shaft continuously connected with the engine for rotation therewith; an output shaft; a first planetary gearset having a plurality of planetary gear members, said first planetary gearset being continuously connected with said input shaft; a second planetary gearset having a plurality of planetary gear members, said second planetary gearset being drivingly interconnected with said output shaft; a third planetary gearset having a plurality of planetary gear members, said third planetary gearset being drivingly interconnected with said output shaft; a first torque transmitting mechanism selectively operable to engage said first planetary gearset with said second planetary gearset to provide a forward drive ratio; a second torque transmitting mechanism selectively operable to engage said first planetary gearset with said third planetary gearset to provide a reverse drive ratio; and a third torque transmitting mechanism for selectively braking rotation of at least one of said planetary gear members of said second planetary gearset and said third planetary gearset to serve as a reaction member in both said forward drive ratio and said reverse drive ratio.