DOC AIRBUS | AMM A320FINLET GEARBOX (IGB) AND NO.3 BEARING ASSEMBLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
Inlet Gearbox (IGB) and No. 3 bearing assembly are located in the forward sump of the engine, attached to the fan frame assembly aft flange with 15 nuts.
These include:
** ON A/C NOT FOR ALL Inlet Gearbox (IGB) and No. 3 bearing assembly are located in the forward sump of the engine, attached to the fan frame assembly aft flange with 15 nuts.
These include:
Inlet GearBox (IGB) and N°3 Bearing Assembly- IGB horizontal bevel gear
- Pinion bevel gear
- Flanged thrust ball bearing
- Flanged roller bearing
- IGB housing
- Radial drive shaft oil nozzle
- No. 3 cylindrical roller bearing
- No. 3 roller and ball bearing oil distributor
- No. 3 seal oil distributor
- No. 3 bearing rotating seal
- No. 3 roller and ball bearing housing
- No. 3 bearing oil nozzle
- No. 3 bearing locking nut
- No. 3 thrust ball bearing.
2. System Description
A. The No. 3 Bearing
It consists of a ball bearing and a separate roller bearing. The function of the No. 3 bearing is to support radial loads through the No. 3 roller bearings and support axial, radial and circumferential loads through the No. 3 ball bearings.
It consists of a ball bearing and a separate roller bearing. The function of the No. 3 bearing is to support radial loads through the No. 3 roller bearings and support axial, radial and circumferential loads through the No. 3 ball bearings.
B. The IGB
It consists of a horizontal bevel gear connected to the High Pressure Compressor (HPC) front shaft and a pinion bevel gear connected to the radial drive shaft, IGB housing, flanged roller bearing and the flanged ball bearing for support of the pinion bevel gear and lubrication nozzles.
It consists of a horizontal bevel gear connected to the High Pressure Compressor (HPC) front shaft and a pinion bevel gear connected to the radial drive shaft, IGB housing, flanged roller bearing and the flanged ball bearing for support of the pinion bevel gear and lubrication nozzles.
3. Operation
In the engine running mode, the IGB transmits torque from the HPC front shaft through the horizontal bevel gear through the pinion bevel gear to the radial drive shaft. In the engine starting mode, the pneumatic air starter transmits torque to the IGB through the radial drive shaft. This torque is then transmitted to the pinion bevel gear, to the horizontal bevel gear, to the HPC front shaft causing the HPC rotor and High Pressure Turbine (HPT) rotor to rotate during the engine start.
In the engine running mode, the IGB transmits torque from the HPC front shaft through the horizontal bevel gear through the pinion bevel gear to the radial drive shaft. In the engine starting mode, the pneumatic air starter transmits torque to the IGB through the radial drive shaft. This torque is then transmitted to the pinion bevel gear, to the horizontal bevel gear, to the HPC front shaft causing the HPC rotor and High Pressure Turbine (HPT) rotor to rotate during the engine start.