Intermediate casing of a turbojet and a turbojet
View Patent ↗The present invention relates to an intermediate casing of a turbojet comprising, between an inner hub and an outer cylindrical shroud, a plurality of radial arms at least one of which is hollow, a radial transmission shaft for driving the auxiliary machines being mounted rotatably in said radial arm, a first end of the transmission shaft passing through the inner hub and the second end passing through the outer cylindrical shroud. The housing is notable in that the inner volume consists of a single compartment housing the transmission shaft and forming a passageway for a lubrication fluid.
1. An intermediate casing of a turbojet comprising, between an inner hub and an outer cylindrical shroud, a plurality of radial arms at least one of which is hollow, a radial transmission shaft for driving the auxiliary machines being mounted rotatably in said radial arm, a first end of the transmission shaft passing through the inner hub and the second end passing through the outer cylindrical shroud, a casing wherein the inner volume of the radial arm consists of a single compartment housing the transmission shaft and forming a passageway for a lubrication fluid.
2. The intermediate casing as claimed in claim 1 , wherein calibrated clearances are arranged between the ends of the transmission shaft and openings formed in the inner hub and the outer cylindrical shroud respectively.
3. The intermediate casing as claimed in claim 1 , comprising at least one annular partition for the separation of gas flows into two concentric annular flows, primary and bypass respectively, wherein the radial arm comprises a first portion passing through the main flow, a second portion passing through the bypass flow, the first portion of the arm being narrower than the second portion.
4. The intermediate casing as claimed in claim 3 , wherein the portion of the radial arm passing through the bypass flow comprises longitudinal reinforcing ribs.
5. The intermediate casing as claimed in claim 4 , wherein the reinforcing ribs have holes in them.
6. The intermediate casing as claimed in claim 1 , wherein the transmission shaft is one-piece.
7. A turbojet comprising an enclosure with bearings, an accessory gearbox and an intermediate casing as claimed in claim 1 wherein said radial arm places said enclosure in communication with said accessory gearbox.
8. The turbojet as claimed in claim 7 , wherein the accessory gearbox comprises an oil reservoir that is placed in communication with the enclosure by the radial arm.