Patent ID: 8074455
Filing Date: 2011-12-13
Classification: F02C,F05D

Abstract:
1. A twin-spool gas turbine engine comprising: a high-pressure rotor and a low-pressure rotor, which rotors are mounted in bearings supported by an intermediate casing; at least one accessory gear box; and a drive device which drives first and second radial shafts which are coaxial for transmitting movement to the accessory gear box, the drive device including a high-pressure drive gear which drives the first radial shaft and is connected to the high-pressure rotor, and a low-pressure drive gear which drives the second radial shaft and is connected to the low-pressure rotor upstream of the high-pressure drive gear, wherein the low-pressure drive gear includes a substantially radial upstream portion with a toothset formed on a downstream side of the radial upstream portion, a substantially cylindrical downstream portion which is supported in the intermediate casing by an axial-positioning bearing and a transition portion between the radial upstream portion and the cylindrical downstream portion, an inner side of the transition portion is continuous with the downstream side of the radial upstream portion and an outer circumferential surface of the cylindrical downstream portion and an outer side of the transition portion is continuous with an upstream side of the radial upstream portion and an inner circumferential surface of the cylindrical downstream portion, and wherein the outer circumferential surface of the cylindrical downstream portion of the low-pressure drive gear abuts the axial-positioning bearing.