Assemblies including fasteners and methods for fastening structures having holes
A technology of fasteners and components, applied in the direction of threaded fasteners, connecting members, screws, etc., can solve the problems of increasing assembly time, increasing joint deflection, and complex installation methods of parts
Active Publication Date: 2021-07-30
THE BOEING CO
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- Description
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- Application Information
AI Technical Summary
Problems solved by technology
Using a socket bolt system has the following disadvantages: (a) parts require complex installation methods; (b) parts require careful handling to prevent damage; and (c) the system requires extensive in-line measurements (resulting in longer assembly times)
Using loose fit fasteners with cap seals has the following disadvantages: (a) the system allows for increased joint deflection over time, affecting fatigue performance; and (b) the extensive time involved in seal cap application increases assembly time
Additionally, existing interference fit solutions for metallic aircraft structures may not be optimized to reduce installation force loads when installing fasteners
Higher installation force loads may cause composite cracking or excessive delamination
Method used
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[0029] An externally threaded fastener such as bolt 2 may be used to fasten a first structure with a first hole and a second structure with a second hole, the first and second holes having the same diameter. According to one embodiment, the method comprises the steps of: placing the first structure and the second structure together such that the first hole and the second hole are aligned; inserting the threaded part 8 of the bolt 2 into the hole in the first structure , until the edge of the hole in the first structure contacts and surrounds the tapered lead-in section 14; the bolt 2 is forced further into the aligned holes of the first and second structures so that the shank 6 contacts the edge of the hole in the first structure, passing through the hole in the first structure and then through the hole in the second structure until the threaded portion 8 of the bolt 2 protrudes beyond the second structure; and coupling the mating part to the threaded portion 8 of the bolt 2 . ...
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The present disclosure relates to assemblies including fasteners and methods for fastening structures having holes. An assembly includes: a first structural element and a second structural element having aligned holes; a fastener that occupies at least a corresponding portion of the hole without a surrounding sleeve; and a mating member, The mating member is coupled to the fastener. The fastener includes: a head; a cylindrical shank extending from the head; a mating portion including an external protrusion; and a transition portion disposed between the shank and the mating portion. The transition portion includes a tapered lead-in section meeting the shank at a stem / lead-in intersection and an arcuate lead-in section meeting the tapered lead-in section. The tapered lead-in section tapers toward the mating portion in a first axial direction, has a linear first profile and has a taper angle below 20 degrees, and the arcuate lead-in section is in the first axial direction The direction is abruptly curved and has a second profile that is an arc of a circle with a radius.
Description
technical field [0001] The present disclosure generally relates to the use of fasteners to secure two or more structures or workpieces (at least one of which is made of a composite material such as fiber-reinforced plastic) such that the height of the fasteners within corresponding holes in the layers is higher than Winning cooperation was realized. In particular, the present disclosure relates to interference fit fastener assemblies that include a bolt or pin and a mating component (eg, a nut or collar) and that do not include a sleeve surrounding the fastener. Background technique [0002] A common practice for fastening multiple layers of material together is to clamp the layers, drill holes, and then insert some type of fastener into the holes, thereby securing the layers together. Fasteners are typically inserted into receiving holes in each layer with a stock or clearance fit. For many applications this will be sufficient. However, when the assembled structure is su...
Claims
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IPC IPC(8): F16B35/04F16B37/00F16B33/06
CPCF16B33/06F16B35/041F16B35/045F16B37/00F16B4/004F16B5/01F16B19/05F16B5/02F16B33/02F16B41/002
Inventor B·A·辛普森T·西斯科
Owner THE BOEING CO