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US 2026/0275874 A1Published application
Turbine rotor dovetail structure with splines
AssigneePratt & Whitney Canada Corp.
InventorsFrancis Gemme, Othmane Leghzaouni, Robert Huszar, Daniel Lecuyer
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Abstract
A fir tree structure is provided and includes a part extending radially inwardly from a rotating part and having an inward taper. The part has a spline profile forming fixing lobes and necks, which are interleaved with the fixing lobes. The spline profile has constantly changing radii of curvature characterized in that the radii of curvature are relatively reduced in high stress locations and relatively increased in low stress locations.
Claims2
A method of forming a fir tree structure of a turbine blade, the method comprising:
- providing a part extending radially inwardly from the turbine blade and having an inward taper;
- and
- forming the part to have a spline profile forming fixing lobes and fixing necks, which are interleaved with the fixing lobes,
- the forming of the part comprising:
- identifying high and low stress locations of the part;
- and
- designing the spline profile to have constantly changing radii of curvature characterized in that the radii of curvature are relatively reduced in the high stress locations and relatively increased in the low stress locations.
4 more elements
Dependencies are inferred from the claim text.