Patent ID: 7758302
Filing Date: 2010-07-20
Classification: F02C

Abstract:
1. A device for driving auxiliary machines of a double-shaft turbine engine with an LP shaft and an HP shaft, the machines being installed in an accessory gearbox comprising a common drive shaft, the device comprising: a differential gear with a first input shaft and a second input shaft and an output shaft, the first input shaft being connected via a selective coupling either to the LP shaft or to the HP shaft, the second input shaft being connected to the HP shaft, and the output shaft being connected to the drive shaft of the gearbox, wherein the selective coupling includes a first coupling disposed between the first input shaft and the LP shaft, and wherein a free wheel device disposed in a mechanical transmission line between the first coupling and the LP shaft is engaged when the engine is operating and disengaged when the engine is driven on start-up by the shaft of the accessory gearbox.