DOC AIRBUS | AMM A320FACCESSORY DRIVES (EXTERNAL GEARBOX) - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The external gearbox has an angle gearbox assembly, a main gear assembly and external components.
The external gearbox is installed at the bottom of the fan case. Four articulated support links attach the gearbox to the fan case. The links have spherical bearings at each end to allow for any necessary mount articulation.
** ON A/C NOT FOR ALL The external gearbox has an angle gearbox assembly, a main gear assembly and external components.
Accessory DrivesThe external gearbox is installed at the bottom of the fan case. Four articulated support links attach the gearbox to the fan case. The links have spherical bearings at each end to allow for any necessary mount articulation.
2. Angle Gearbox
A. General
The angle gearbox transmits power from the engine to the main gearbox and from the starter on the main gearbox to the engine.
The angle gearbox transmits power from the engine to the main gearbox and from the starter on the main gearbox to the engine.
B. Description
The angle gearbox has a bevel gearset held by a cast aluminium housing. The bevel gearset transmits the power to and from the engine through a powershaft engaged to the high pressure compressor rotor. The bevel gearset has a spiral gear mesh which drives a horizontal input gearshaft in the main gearbox.
Two metered jets supply pressure oil to the bearings and gears in the angle gearbox.
The angle gearbox has a bevel gearset held by a cast aluminium housing. The bevel gearset transmits the power to and from the engine through a powershaft engaged to the high pressure compressor rotor. The bevel gearset has a spiral gear mesh which drives a horizontal input gearshaft in the main gearbox.
Two metered jets supply pressure oil to the bearings and gears in the angle gearbox.
3. Main Gearbox
A. General
The main gearbox is installed forward of the angle gearbox. The main gearbox transmits power from the engine to the accessories installed on the gearbox and from the starter to the engine. The main gearbox supplies speed torques necessary for the accessories to perform their various functions.
The main gearbox is installed forward of the angle gearbox. The main gearbox transmits power from the engine to the accessories installed on the gearbox and from the starter to the engine. The main gearbox supplies speed torques necessary for the accessories to perform their various functions.
(1) General
(a) The main gearbox has a cast aluminium housing that has a rear train and mounting pads for the airframe and engine accessories. An external de-oiler is installed on the front face of the main gearbox.
Each of the accessories drive geartrain sections is individually replaceable. The metered oil nozzles are installed on a gearbox housing and supply pressure oil to the bearings and gears in the gearbox. An external oil tank is attached at the LH flange of the main gearbox.
Each of the accessories drive geartrain sections is individually replaceable. The metered oil nozzles are installed on a gearbox housing and supply pressure oil to the bearings and gears in the gearbox. An external oil tank is attached at the LH flange of the main gearbox.
(b) Drive pads on the forward face of the gearbox are used for installation of the following:
- hydraulic pump,
- starter,
- oil pressure pump,
- Permanent Magnet Alternator (PMA),
- provision for remote cranking of the high pressure rotor is also located on the front face.
(2) Drive pads on the rear face of the gearbox are used for installation of the following:
- Integrated Drive Generator (IDG) system,
- fuel pump,
- oil scavenge pump.
NOTE: Direction of gearshaft rotation is the direction that you look in when you face the mounting pad being described.
(3) Hydraulic pump drive gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the adjacent IDLER gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the adjacent IDLER gearshaft.
(4) Starter drive gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the adjacent crank gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the adjacent crank gearshaft.
(5) Oil pressure pump
The oil pressure pump is a removable assembly installed on the front flange of the gearbox. The pump has a separate housing that has two bush-mounted drive gear assemblies and the seat of the oil pressure filter.
Direction of drive rotation is counterclockwise. The oil pressure pump receives the motion through the fuel pump drive gearshaft.
The pump supplies oil under pressure to the engine bearings and accessory drives.
The oil pressure pump is a removable assembly installed on the front flange of the gearbox. The pump has a separate housing that has two bush-mounted drive gear assemblies and the seat of the oil pressure filter.
Direction of drive rotation is counterclockwise. The oil pressure pump receives the motion through the fuel pump drive gearshaft.
The pump supplies oil under pressure to the engine bearings and accessory drives.
(6) PMA gearshaft
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the adjacent input gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the adjacent input gearshaft.
(7) IDG gearshaft
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the starter gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the starter gearshaft.
(8) Fuel pump drive gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the hydraulic pump drive gearshaft.
Direction of drive rotation is counterclockwise. The gearshaft receives the motion through the hydraulic pump drive gearshaft.
(9) Oil scavenge pump
The oil scavenge pump is a removable assembly installed on the flange of the support angle gearbox. The pump has a separable housing that has a bush-mounted drive gear assembly which moves two pump gear stages.
The pump receives the motion through the idler gearshaft. The direction of drive rotation is counterclockwise.
The oil scavenge pump is a removable assembly installed on the flange of the support angle gearbox. The pump has a separable housing that has a bush-mounted drive gear assembly which moves two pump gear stages.
The pump receives the motion through the idler gearshaft. The direction of drive rotation is counterclockwise.
(10) External Deoiler
Direction of drive rotation is counterclockwise. The deoiler receives the motion through the IDG system gearshaft.
The oil/air mixture flows through the deoiler that separates air and oil by centrifugal action.
The deaerated oil goes back to the oil system and the clean air is bled overboard.
Direction of drive rotation is counterclockwise. The deoiler receives the motion through the IDG system gearshaft.
The oil/air mixture flows through the deoiler that separates air and oil by centrifugal action.
The deaerated oil goes back to the oil system and the clean air is bled overboard.