Patent ID: 7386983
Filing Date: 2008-06-17
Classification: F02C,F05D,Y10T

Abstract:
1. A mechanical drive system for an accessory gearbox of a gas turbine engine, which engine has a high-pressure drive shaft and a low-pressure drive shaft, the drive system comprising: a first tower shaft connected by a first gear arrangement to the high-pressure drive shaft; a second tower shaft connected by a second gear arrangement to the low-pressure drive shaft, wherein the first tower shaft is concentric with the second tower shaft; a first lay shaft connected by a third gear arrangement to the first tower shaft, and connected to the accessory gearbox, the third gear arrangement including a first bevel gear attached to the first tower shaft, and a second bevel gear attached to the first lay shaft, wherein the first bevel gear and the second bevel gear are engaged with one another; a second lay shaft connected by a fourth gear arrangement to the second tower shaft, and connected to the accessory gearbox, wherein the first lay shaft is disposed spaced apart from and parallel to the second lay shaft; wherein the fourth gear arrangement includes a first spur gear, a second spur gear, an intermediate shaft, a first bevel gear, and a second bevel gear, wherein the first spur gear is attached to the second tower shaft, and the second spur gear and the first bevel gear are attached to the intermediate shaft, and the second bevel gear is attached to the second lay shaft; wherein the first spur gear and the second spur gear are engaged with one another; and wherein the first bevel gear and the second bevel gear are engaged with one another.