Assembly including an AGB and an oil tank
View Patent ↗An assembly that includes an accessory gearbox (AGB) and a tank for a liquid lubricant for a turbojet engine. The AGB includes a gear connected to parallel shafts for mechanically driving accessories. The assembly includes a housing with two compartments and a partition perpendicular to the shafts for separating the compartments, a compartment defining the accessory gearbox and a compartment defining the liquid tank. The assembly can be compact and easily manufactured.
1. An assembly comprising:
an accessory gearbox, including gearing connected to mutually parallel shafts that mechanically drive accessories;
a reservoir of lubricant for a turbojet engine, the lubricant being supplied to the accessory gearbox; and
a box including the accessory gearbox, the lubricant reservoir, and a partition, perpendicular to the mutually parallel shafts, that separates the accessory gearbox and the lubricant reservoir, the partition extending from a first end of the accessory gearbox and the lubricant reservoir to a second end of the accessory gearbox and the lubricant reservoir, the box being of a shape that is curved, to follow a shape of a cylindrical casing of the turbojet engine to which the box is configured to be fixed, wherein
there is no fluidic communication through the partition between the accessory gearbox and the lubricant reservoir,
a main oil line guides the lubricant to an oil supply line which lubricates the accessory gearbox, and
two adjacent shafts of the mutually parallel shafts extend in opposite directions from the gearing to transmit mechanical power respectively to accessories mounted on opposite sides of the box.
2. The assembly as claimed in claim 1 , wherein, with the turbojet engine extending generally along an axis, the gearing of the accessory gearbox is configured to be driven by a power take-off shaft substantially perpendicular to the axis of the turbojet engine.
3. The assembly as claimed in claim 1 , wherein the accessory gearbox and the lubricant reservoir are manufactured by machining from a solid block of metal.
4. The assembly as claimed in claim 1 , wherein the accessory gearbox is formed of a first half-shell and the lubricant reservoir is formed of a second half-shell, wherein the half-shells are fixed together.
5. The assembly as claimed in claim 4 , wherein the half-shells are fixed together, or are fixed together with the partition, removably, or by screw-fastening.
6. The assembly as claimed in claim 4 , wherein the partition is secured nonremovably to the second half-shell that forms the lubricant reservoir, or is welded thereto.
7. The assembly as claimed in claim 1 , wherein the box is of a shape that is generally elongate in a direction substantially perpendicular to the mutually parallel accessory drive shafts.
8. The assembly as claimed in claim 1 , wherein the lubricant reservoir also acts as a support for at least some of the accessories driven by the accessory gearbox.
9. The assembly as claimed in claim 8 , wherein, with the mutually parallel shafts that drive the accessories extending at least partially into the lubricant reservoir, protective tubes, along which the mutually parallel shafts extend, are mounted in the reservoir.
10. The assembly as claimed in claim 1 , wherein the mutually parallel shafts cross the partition between the accessory gearbox and the lubricant reservoir, and are not in direct contact with the lubricant.
11. The assembly as claimed in claim 10 , wherein protective tubes house the mutually parallel shafts and prevent direct contact between the shafts and the lubricant.
12. The assembly as claimed in claim 1 , wherein at least one shaft of the mutually parallel shafts passes through a wall of the accessory gearbox and does not pass through the partition.
13. The assembly as claimed in claim 1 , wherein at least one shaft of the mutually parallel shafts passes through the partition and does not pass through a wall of the accessory gearbox.
14. The assembly as claimed in claim 1 , wherein the partition has a solid body, a first side of which forms an interior face of the accessory gearbox and a second side of which forms an interior face of the lubricant reservoir.