Patent ID: 7029417
Filing Date: 2006-04-18
Classification: F16H

Abstract:
1. 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 connectable with the engine for rotation therewith; an output shaft; a first planetary gearset having a first member operably coupled with said input shaft, a second member and a third member; a second planetary gearset having a first member drivingly interconnected with said output shaft, a second member and a third member; a third planetary gearset having a first member drivingly interconnected with said output shaft, a second member and a third member, wherein said first member of said second planetary gearset and said first member of said third planetary gearset are unitarily formed as a ring gear directly engaging a pinion gear of said second planetary gearset and a pinion gear of said third planetary gearset, said pinion gears being rotatable relative to one another; a first torque transmitting mechanism selectively operable to engage said second member of said first planetary gearset with said third member of said second planetary gearset to provide a first forward ratio; a second torque transmitting mechanism selectively operable to engage said second member of said first planetary gearset with said third member of said third planetary gearset to provide a reverse ratio; and a third torque transmitting mechanism for selectively braking rotation of at least one of said second member of said second planetary gearset and said second member of said third planetary gearset to serve as a reaction member in one of said first forward ratio and said reverse ratio.