Barrel nut with stress reduction features
AssigneeThe Boeing Company
InventorsAdrian Stanescu, Constantine Kostakis, Michael Ronald Butcher
Life of this patent
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Abstract
A barrel nut with features for reducing tensile stresses under heavy load within the barrel nut has a partial-cylindrical body having a first planar end surface and a second planar end surface. A threaded bore extends through the partial-cylindrical body with a central axis substantially parallel to the first planar end surface and the second planar end surface. At least one groove is formed in each of the first planar end surface and the second planar end surface, the groove having a rounded surface extending at least a part of a distance between a curved upper surface of the partial-cylindrical body to a bottom surface thereof in a direction substantially parallel to the central axis of the threaded bore.
Claims20
A method of reducing stress in a barrel nut comprising:
- forming a one-piece partial-cylindrical body having a first planar end surface and a second planar end surface;
- forming a threaded bore through the partial-cylindrical body with a central axis substantially parallel to the first planar end surface and the second planar end surface;
- and
- forming at least one groove recessed into each of the first planar end surface and the second planar end surface extending at least a part of a length of the partial-cylindrical body in a direction substantially parallel to the central axis of the threaded bore.
A method of mounting an aircraft engine to an aircraft, comprising the steps of:
- inserting a barrel nut into a cylindrical bore extending through an aircraft engine mount, the barrel nut comprising a one-piece partial-cylindrical body having a first planar end surface and a second planar end surface, a threaded bore extending through the partial-cylindrical body and at least one groove recessed into each of the first planar end surface and the second planar end surface extending at least a part of a distance between a curved upper surface of the partial-cylindrical body and a bottom surface of the partial-cylindrical body in a direction substantially parallel to a central axis of the threaded bore;
- aligning the barrel nut within the cylindrical bore with bolt holes positioned through a top surface of the aircraft engine mount;
- inserting bolts through the bolt holes and into the threaded bore in the barrel nut;
- and
- tightening the bolts.
A method of reducing stress in a barrel nut comprising:
- forming a partial-cylindrical body having a first planar end surface and a second planar end surface;
- forming a threaded bore through the partial-cylindrical body with a central axis substantially parallel to the first planar end surface and the second planar end surface;
- forming at least one groove recessed into each of the first planar end surface and the second planar end surface extending at least a part of a length of the partial-cylindrical body in a direction substantially parallel to the central axis of the threaded bore;
- and
- forming in a bottom surface of the partial-cylindrical body a flange surrounding the threaded bore, the flange being raised above the bottom surface and extending from a circumferential edge of the threaded bore to a side edge of the bottom surface.
Dependencies are inferred from the claim text.