Gas turbine engine architecture
First Claim
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1. A gas turbine engine comprising:
- a primary reduction gearbox enclosing a plurality of reduction gearbox bearings therewithin;
at least a high pressure shaft rotatably supported by a plurality of high pressure shaft bearings and having a compressor and a turbine mounted thereto;
a gas generator portion defining a shaft bearing cavity therewithin, the shaft bearing cavity containing at least the high pressure shaft bearings; and
wherein the primary reduction gearbox and shaft bearing cavity are engaged in unrestricted oil flow communication and define a single oil cavity within which the reduction gearbox bearings and the high pressure shaft bearings are enclosed.
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Abstract
A gas turbine engine having an oil cavity architecture and bearing placement which reduce heat rejection and oil system complexity by enclosing the reduction gearbox bearings and at least the shaft bearings supporting the high pressure shaft in the same oil cavity.
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Citations
20 Claims
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1. A gas turbine engine comprising:
- a primary reduction gearbox enclosing a plurality of reduction gearbox bearings therewithin;
at least a high pressure shaft rotatably supported by a plurality of high pressure shaft bearings and having a compressor and a turbine mounted thereto;
a gas generator portion defining a shaft bearing cavity therewithin, the shaft bearing cavity containing at least the high pressure shaft bearings; and
wherein the primary reduction gearbox and shaft bearing cavity are engaged in unrestricted oil flow communication and define a single oil cavity within which the reduction gearbox bearings and the high pressure shaft bearings are enclosed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a primary reduction gearbox enclosing a plurality of reduction gearbox bearings therewithin;
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8. A gas turbine engine comprising:
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a casing; a primary reduction gearbox having a plurality of reduction gearbox bearings and an accessory gearbox having a plurality of accessory gearbox bearings; at least a first shaft having a compressor and turbine mounted thereto, the first shaft being rotatably supported by at least two shaft bearings; and wherein the reduction gearbox, the accessory gearbox and the shaft bearings are disposed in a single oil cavity within the casing, and wherein unrestricted oil flow is possible between the reduction gearbox bearings, the accessory gearbox bearings and said shaft bearings. - View Dependent Claims (9, 10, 11, 12, 13)
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- 14. A gas turbine engine comprising at least outer and inner concentric shafts, at least said outer shaft having a compressor and turbine mounted thereto, the said shafts being respectively rotatably supported by at least two outer shaft bearings and at least two inner shaft bearings, said at least two outer shaft bearings being spaced apart from a turbine end of the outer concentric shaft such that the turbine is disposed between said at least two outer shaft bearings and said end, such that the outer concentric shaft is cantilevered from the outer shaft bearings, and wherein said at least two outer shaft bearings are located forward of the compressor mounted on said outer concentric shaft.
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20. A free turbine gas turbine engine comprising at least outer and inner concentric shafts rotatably supported by a plurality of shaft bearings, the outer shaft being a free turbine shaft and having a turbine and compressor mounted thereto, all outer shaft bearings disposed forward of the compressor such that the bearings are isolated from the turbine.
Specification