Lubricating and cooling system for intershaft bearing of turbojet
AssigneeSnecma
InventorDaniel G. Girault
Life of this patent
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Abstract
A system for the distribution of atomized lubricating fluid includes a cylindrical ring placed upstream from an intershaft bearing of an inner shaft. The outer surface of the ring forms part of a labyrinth joint. Within the ring are cells open on the upstream surface of the ring, into which flows pressurized air. In the downstream end of each cell is an atomizing orifice directed toward the bearing. In the radially inner wall of each cell is an approximately radial bore. These bores cooperate with the means supplying lubricating fluid, which comprise radial bores in the wall of the inner shaft and emptying into a groove provided on the inner surface of the inner shaft. The groove receives lubricating fluid through fixed tubing that passes through the interior of the inner shaft.
Claims8
In a turbojet having inner and outer concentric hollow shafts rotatable about an axis of rotation in a first direction, and at least one bearing positioned between said shafts for permitting relative rotation between said shafts, a system for lubricating and cooling said at least one bearing, said system comprising:
- a first ring having a radially inner portion mounted on a radially outer surface of said inner shaft and being positioned upstream of said at least one bearing relative to the direction of flow of air through said turbojet;
- a plurality of circumferentially spaced cells in said first ring, each of said cells being open at the upstream end of said first ring and having lengths extending into said first ring;
- an atomizing orifice extending between the downstream end of each said cell and the downstream end of said first ring, each said orifice being directed toward said at least one bearing;
- a first radial bore for each of said cells, each said first bore extending through said inner portion of said first ring to one of said cells;
- a second radial bore in said inner shaft for each said first bore, each said second bore being coaxial with one of said first bores;
- an annular groove on an inner wall of said inner shaft, each of said second bores opening into said groove;
- fixed tube means for supplying lubricating fluid to said groove;
- and
- means for supplying pressurized air to said upstream end of said first ring,
- whereby lubricating fluid is supplied to said cells via said groove and coaxial bores, said lubricating fluid mixing with said pressurized air in said cells and being atomized in said orifice and discharged towards said at least one bearing.
Dependencies are inferred from the claim text.