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US 10,696,386 B2Granted
Rigid rotor head with tension torsion (TT) strap retention
AssigneeSikorsky Aircraft Corporation
InventorsFrederick J. Miner, David A. Darrow, Stephen V. Poulin, Richard Thomas Hood, Frank P. D'Anna
Life of this patent
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Abstract
A box frame hub arm structure is provided and includes a body having an outboard surface, which is disposable to abut with an inboard surface of an outboard arm of an aircraft rotor head, and lead/lag sides. The body is formed to define a first cavity, an aperture communicative with the first cavity through the outboard surface and second and third cavities. The second and third cavities extend outwardly in opposite lead/lag directions from the first cavity to the lead/lag sides.
Claims11
A rotor head for use with a blade, comprising:
- an outboard arm including an inboard surface;
- an axial retention block secured at an interior of a blade casing disposable about the outboard arm;
- a box frame body having an outboard surface, which is disposable to abut with the inboard surface, and lead/lag sides and which is formed to define a first cavity, an aperture communicative with the first cavity through the outboard surface and second and third cavities extending outwardly in opposite lead/lag directions from the first cavity to the lead/lag sides;
- a tension torsion (TT) strap, which is receivable in the first cavity to extend through the aperture and connect at an outboard end thereof with the axial retention block, and
- a pin, which is receivable in the second and third cavities and extendable through an inboard end of the TT strap so that the TT strap transfers axial loads of the blade from the axial retention block to the box frame.
2 more elements
Dependencies are inferred from the claim text.