Mitsubishi Aircraft Corporation

Mitbushi Aircraft Corporation

Toru Hashigami

Yuichiro Kamino

Hideo Yamakoshi

Atsuhiro Iyomasa

Wataru Nishimura

Yasunori Watanabe

Naomoto Ishikawa

Masahiro Bessho

Toshikatsu Nohara

Yuji Asahara

Tamaki Tsuzuki

Koji Kawahara

Takeyasu Tarumi

Hiroshi Rikukawa

Hideo Imamura

Naoki Taniguchi

Tomonori Okumura

Soichiro Umemoto

Kohei Murakami

Wataru Nihimura

There are provided a lightning-resistant fastener and a cap, which, while assuring sufficient insulation properties, provide improved workability and highly stable quality to thereby enable a reduction in the manufacturing cost of an airframe, and a method of mounting the lightning-resistant fastener. A holeis formed in a cap, and a screw grooveis formed in the hole. The configuration enables the capto be reliably and easily positioned and installed on a fastener memberand reliably prevents the capfrom coming off after the installation thereof. This improves the workability to reduce the production cost while assuring sufficient insulation properties and enables the capto be installed with stable quality irrespective of workers. Preferably, the capis made of a resin in view of mass producibility, weight reduction, and the like.

Lightning-resistant fastener, cap, and method of mounting lightning-resistant fastener

To provide a lightning protection fastener or the like, that can reliably seal an arc between the cap and a member such as a wing panel. An end partA of a capon an opening side, the end partA facing a member(or member), includes a planeorthogonal to an axis line of the capA and a tapered faceformed on an outer circumferential side of the plane. A sealantthat spills out of the capA upon mounting the capA is present between the tapered faceand a surfaceof the member(sealantS).

Lightning protection fastener and cap for lightning protection fastener

Provided is a coupling structure for airframe components that is capable of ensuring sufficient lightning protection capability. A conductive pattern partmade of a conductive material is formed around each fastener memberbetween wing surface panelsA andB. The conductive pattern partis formed, for example, around each of holesandon the plane on which the wing surface panelA and the wing surface panelB abut against each other. Then, the conductive pattern partis pushed against both the wing surface panelA and the wing surface panelB by the fastening power of the fastener members, whereby electrical conduction between the wing surface panelA and the wing surface panelB can be achieved.

Coupling structure for airframe components

A sealantfilled into a capA is caused to overflow through both an opening in a first end portionof the capA and a through-holeof the capA when the capA is pressed against a fastener member. With regard to the capA, a ratio between inside diameter Dof the opening on the side of the first end portionand hole diameter Dof the through-holein the second end portionis set as follows: 0.10&#x2266;D/D&#x2266;0.27.

Lightning protection fastener and mounting method thereof

In an insulating coverA according to the present invention, a dimension of each of an outer-circumferential-side cylindrical partand an inner-circumferential-side cylindrical partfitting in step partsandin an axial direction of a fastener bodyis set large with respect to a tip covering partcovering a tip surfaceof a fastening member. As a result, on an outer circumferential side and an inner circumferential side of the fastening member, a distance from a memberis sufficiently ensured by the cylindrical partand. The tip covering partis thinner than the cylindrical partB and. Therefore, when the fastener bodyand the fastening memberare fastened together, the amount of deformation of the tip covering partin a thickness direction can be made small.

Lightning-protective explosion-preventive fastener

A long-life lightning protection fastener or the like to prevent explosion for aircrafts at low cost is provided, the fastener having a light weight, ensuring sufficient lightning protection, and having extremely less failures and high reliability. A ring-shaped ring memberA made of resin is mounted on a collar. This ring memberA is interposed between a memberand the collarand is in intimate contact with both of the memberand the collar, thereby sealing an interface with the memberfor sealing and preventing the occurrence of an arc at an outer perimeter edge of the collar

Lightning protection fastener, aircraft assembly, and method of manufacturing aircraft assembly component

A lightning-resistant fastener, a cap, a fastener member, and a method for attaching the lightning-resistant fastener are provided, which enhance workability and quality stability besides reliably securing an insulating property, and can lead to enhancement in safety of an airframe and reduction in manufacturing cost. A head portionof a fastener main bodyincludes a head cap, and a shaft portionof the fastener main bodyincludes a shaft cap, whereby a direct strike of lightning to a fastener member, and occurrence of an arc discharge from the fastener memberin the case of a lightning strike can be suppressed. A holeis formed in the head cap, and a thread grooveis formed in the hole, whereby the head capcan be reliably and easily positioned and attached to the fastener member

Lightning-resistant fastener, cap, fastener member, and method for attaching lightning-resistant fastener

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Aichi, Japan

Toru Hashigami