Patent ID: 7052430
Filing Date: 2006-05-30
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 continuously drivingly 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 operably coupled 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, one of said gear members of said third planetary gearset being drivingly interconnected with one of said members of said first planetary gearset, another one of said gear members of said third planetary gearset being drivingly interconnected with one of said gear members of said second planetary gearset; a first torque transmitting mechanism for selectively braking rotation of one of said gear members of said second planetary gearset to provide a forward launch ratio; a second torque transmitting mechanism selectively operable to engage said third planetary gearset with said input shaft to provide a reverse launch ratio; and a third torque transmitting mechanism for selectively braking rotation of one of said planetary gear members of said third planetary gearset to serve as a reaction member in said forward launch ratio wherein said third torque transmitting mechanism includes a one-way clutch and a plate clutch, both clutches being positioned in series between said one of said planetary gear members of said third planetary gearset and a brake reaction member.