DOC AIRBUS | AMM A320FINLET GEARBOX ASSEMBLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The inlet gearbox (IGB) assembly is located in the fan frame sump and is bolted to the forward side of the fan frame aft flange. The gearbox contains a horizontal bevel gear, a radial bevel gear, a core engine thrust (No. 3 ball) bearing, and a core engine roller bearing. The gearbox assembly serves as the mechanical coupling between the HPC rotor and the TGB.
** ON A/C NOT FOR ALL The inlet gearbox (IGB) assembly is located in the fan frame sump and is bolted to the forward side of the fan frame aft flange. The gearbox contains a horizontal bevel gear, a radial bevel gear, a core engine thrust (No. 3 ball) bearing, and a core engine roller bearing. The gearbox assembly serves as the mechanical coupling between the HPC rotor and the TGB.
Inlet Gearbox Assembly2. Description
A. Horizontal Bevel Gear
The horizontal bevel gear, which has 47 teeth, is splined to the compressor rotor front shaft and secured to it by the No. 3 ball bearing locking nut. The horizontal bevel gear mates to the radial bevel gear to provide rotational torque to the transfer gearbox (TGB) assembly.
The horizontal bevel gear, which has 47 teeth, is splined to the compressor rotor front shaft and secured to it by the No. 3 ball bearing locking nut. The horizontal bevel gear mates to the radial bevel gear to provide rotational torque to the transfer gearbox (TGB) assembly.
B. Radial Bevel Gear
The radial bevel gear, which has 35 teeth, is mounted on 2 roller bearings and one ball bearing (there are no duplex bearings). The gear is internally splined to accept the radial drive shaft which is removable from the exterior of the engine to allow individual replacement of the IGB and TGB.
The radial bevel gear, which has 35 teeth, is mounted on 2 roller bearings and one ball bearing (there are no duplex bearings). The gear is internally splined to accept the radial drive shaft which is removable from the exterior of the engine to allow individual replacement of the IGB and TGB.
C. Thrust Bearing (No. 3 Ball)
The No. 3 ball bearing is installed during IGB assembly between the gearbox housing and the horizontal bevel gear. It provides axial positioning of the forward end of the high pressure compressor (HPC) rotor.
The No. 3 ball bearing is installed during IGB assembly between the gearbox housing and the horizontal bevel gear. It provides axial positioning of the forward end of the high pressure compressor (HPC) rotor.
D. Roller Bearing (No. 3 Roller)
The No. 3 roller bearing is installed during IGB assembly between the gearbox housing and the horizontal bevel gear. It positions the core engine rotor radially.
The No. 3 roller bearing is installed during IGB assembly between the gearbox housing and the horizontal bevel gear. It positions the core engine rotor radially.