Patent ID: 7698884
Filing Date: 2010-04-20
Classification: F02C,Y10S

Abstract:
1. A power transmission arrangement for a gas turbine engine having in axial flow series a first stage compressor, a second stage compressor, a first stage turbine and a second stage turbine, a first main shaft connecting the first stage turbine to the second stage compressor so that the first stage turbine drives the second stage compressor during operation of the engine, and a second main shaft connecting the second stage turbine to the first stage compressor so that the second stage turbine drives the first stage compressor during operation of the engine, said power transmission arrangement comprising: a first power transmission member connectable to the first main shaft; a second power transmission member connectable to the second main shaft; a third power transmission member; and a coupling assembly having a selectable coupling condition to couple the first power transmission member to the second power transmission member to allow power to be transmitted from the third power transmission member to the first main shaft via the first power transmission member, and having a selectable decoupling condition to decouple the first power transmission member from the second power transmission member to allow power to be transmitted from the second main shaft to the third transmission member via the second transmission member.