DOC AIRBUS | AMM A320FTRANSFER GEARBOX ASSEMBLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The transfer gearbox (TGB) provides power transmission between the inlet gearbox (IGB) and the accessory gearbox (AGB).
It consists of the following major assemblies:
** ON A/C NOT FOR ALL The transfer gearbox (TGB) provides power transmission between the inlet gearbox (IGB) and the accessory gearbox (AGB).
Transfer Gearbox AssemblyIt consists of the following major assemblies:
- Radial drive shaft assembly.
- TGB assembly.
2. Description
A. Radial Drive Shaft Assembly
The radial drive shaft (RDS) assembly is installed inside the fan frame No. 7 strut at the 6 o'clock position. It consists of the radial drive shaft and the shaft midlength bearing.
The radial drive shaft (RDS) assembly is installed inside the fan frame No. 7 strut at the 6 o'clock position. It consists of the radial drive shaft and the shaft midlength bearing.
(1) The radial drive shaft is made of steel alloy. It is hollow and measures approximately 29.52 in. (0.75 m). Both ends are externally splined and connect the IGB bevel gear and the TGB input bevel gear. A foolproof slot is machined on the shaft to avoid inversion of RDS during installation.
(2) The shaft midlength bearing provides proper centering of radial drive shaft in its housing. Its inner race is mounted half-way up on the RDS and the outer race is part of the radial drive shaft housing.
B. TGB Assembly
The TGB assembly is installed under the fan frame at the 6 o'clock position. It consists of the housing and a set of 2 bevel gears.
The TGB assembly is installed under the fan frame at the 6 o'clock position. It consists of the housing and a set of 2 bevel gears.
(1) The TGB housing is made of two aluminum alloy castings bolted together. It is secured to the fan frame through a single clevis/link rod mounting arrangement located at the upper part of the TGB housing front end. The upper part of the TGB housing contains an adapter which corresponds to an adapter mounted on the fan frame. The TGB housing accommodates 3 oil nozzles for lubrication of the bevel gears and the bearings. The casting of the TGB housing is double-walled, to provide better oil scavenge.
(2) The upper part of the TGB houses the input bevel gear, its bearing housing, ball bearing, and roller bearing. The bore of the bevel gear is splined at its upper end and connects with the radial drive shaft. An oil distributor installed inside the bevel gear and secured by a Spirolock system, ensures oil distribution and axial retention of the radial drive shaft.
(3) The horizontal part of the TGB houses the horizontal bevel gear, its bearing housing, ball bearing and roller bearing.
The bore of this bevel gear is splined at its forward end and connects with the horizontal drive shaft. An oil distributor installed inside the bevel gear and secured by a Spirolock system, ensures oil distribution to the bearing. The horizontal drive shaft housing is made of aluminum alloy, and the bearing housing is a cast part. It protects the horizontal drive shaft and the bevel gear assembly, and ensures connection with the AGB. It is bolted to both TGB and AGB housings. The suspension clevis is a cast part and is integral with the horizontal drive shaft housing.
The bore of this bevel gear is splined at its forward end and connects with the horizontal drive shaft. An oil distributor installed inside the bevel gear and secured by a Spirolock system, ensures oil distribution to the bearing. The horizontal drive shaft housing is made of aluminum alloy, and the bearing housing is a cast part. It protects the horizontal drive shaft and the bevel gear assembly, and ensures connection with the AGB. It is bolted to both TGB and AGB housings. The suspension clevis is a cast part and is integral with the horizontal drive shaft housing.