JP5433366B2 - Lightning-resistant fastener, aircraft assembly, and lightning-fastener fastening method - Google Patents

Description

  The present invention relates to a lightning-resistant fastener, an aircraft assembly, a fastener member, and a plug cap used for an aircraft body, particularly a wing.

A wing constituting an aircraft body has a hollow structure, and a wing surface panel forming a wing surface is fixed to a structural material inside the wing by a fastener member (fastener).
The fastener member has a pin-shaped fastener body inserted into a through-hole formed in both the wing and the member attached to the wing from the outside of the wing, and a fastening member such as a nut from the inside of the wing at the tip thereof. By fastening, the wing and the member are fixed.

  By the way, in an aircraft, it is necessary to take thorough countermeasures against lightning. When a fuselage is made of a metal material, the lightning current flows through the entire fuselage, whereas when a fuselage is made of a composite material, the current charge from the lightning moves on the surface and inside of the wing panel. When the electric current density exceeds the proof stress of the fastener member portion, arc discharge is generated starting from the metal fastener member. Since a fuel tank is housed in the inner space of the wing, it is necessary to reliably suppress the occurrence of arc discharge during lightning strikes.

  Therefore, a fastener member in which one end surface of the head is covered with an insulating cap is known (for example, see Patent Document 1).

However, the fastener disclosed in the above document may cause the insulating cap to peel off from the fastener head during operation of the aircraft.
Therefore, the insulating layer covers one end surface of the head so that the peel-off of the insulating cap during aircraft operation can be surely prevented, and the lightning prevention effect and reliability on the fastener can be improved. There has already been proposed a lightning-resistant fastener that is fused as described above and mechanically meshed with an engaging portion formed on the one end face (see, for example, Patent Document 2).

US Pat. No. 4,630,168 JP 2009-83640 A

  However, the conventional technology as described above has a problem that it is not effective for a fastener having a recess (concave portion) for placing a tool on the head. That is, a fastening member such as a nut is attached to the fastener body at the stage of attaching the fastener to the wing panel. At this time, on one side of the wing surface panel, a tool such as a wrench is hung on a recess formed on the head of the fastener body, and on the other side of the wing surface panel, a fastening member such as a nut is used as a tool such as a wrench. To fasten the fastener body and the fastening member.

  However, in the techniques of Patent Documents 1 and 2, the cap and the insulating layer are integrated with the head of the fastener body when the fastener body is passed through the through-hole formed in the blade panel. This is because even if a recess is formed in advance in such a fastener body, the cap or the insulator layer may be damaged by applying a tool, and insulation may not be ensured.

Further, the cap or the insulator layer is formed with a concave portion corresponding to the recess, and there is a problem that the aerodynamic performance is not satisfied.
The present invention has been made based on such a technical problem, and provides a lightning-resistant fastener, an aircraft assembly, a fastener member, and a plug cap that can sufficiently secure insulation even when a tool is applied. Objective.

The present invention made for this purpose is formed on the first member and the second member to fasten the second member on the inner side of the fuselage with respect to the first member constituting the aircraft fuselage. A fastener main body provided to penetrate the hole formed from one side to the other side, a fastening member mounted on the fastener main body protruding on the other side of the first member and the second member, A fastener cap made of an insulating material and provided to cover the fastener body on one side of the member and the second member. The fastener body has a head having an outer diameter larger than the hole on one side of the first member and the second member, and a tool is used to fasten the fastener body and the fastening member to the head. A recess is formed to hang. The fastener cap is provided on the outer peripheral side of the head of the fastener body, and includes a ring-shaped outer cap having an opening that exposes a recess in the center, and an inner cap that covers the opening of the ring cap. And an insulating sealant agent is interposed between the inner cap and the head of the fastener body .
When fastening the first member and the second member, the fastener body is passed through the holes formed in the first member and the second member, and the fastening member is attached to the tip of the fastener body, The first member and the second member are sandwiched and fastened by the head and the fastening member. In this state, since the outer cap is provided on the head of the fastener body, a tool can be put on the recess exposed inside the opening of the outer cap when fastening. And after fastening, by attaching an inner cap to the opening part of an outer cap, and closing an opening part, the head of a fastener main body can be covered with an insulating material, and lightning-proof performance can be ensured.
The sealant is preferably filled between the inner cap and the head of the fastener body.

Any configuration may be adopted for the outer cap and the inner cap, but an engaging portion that engages with each other is formed on the inner peripheral edge of the opening of the outer cap and the outer peripheral edge of the inner cap. Is preferred.
The outer cap is preferably formed by insert molding with respect to the head of the fastener body. Thereby, the peel-off of the outer cap can be prevented.
Furthermore, it is preferable that the top surfaces of the outer cap and the inner cap are formed flat.

The inner cap may be only a plate portion that closes the opening, but preferably further includes a plug portion that is inserted into the recess.
Moreover, it is preferable that the through-hole which penetrates the both surfaces is formed in a plate part. When a sealant agent having an insulating property is filled in the recess, when the plug portion is inserted into the recess filled with the sealant agent, the sealant agent pushed out of the recess may be discharged from the through hole to the outside. it can.
It is preferable that the plug portion has a cap portion formed at the tip end portion of the plug portion so as to protrude to the outer peripheral side. Thereby, when the sealant agent filled in the recess is cured, the inner cap can be prevented from falling off by the bulk portion.
In addition, the plug portion has a plurality of protrusions protruding outward on the outer peripheral portion of the plug portion, and when the plug portion is inserted into the recess, the protrusion is deformed by abutting against the inner peripheral surface of the recess. Then, the frictional force may be generated between the plug portion and the recess to prevent the dropout.

By the way, when the head of the fastener body has a diameter-enlarging surface whose outer diameter gradually increases from the portion inserted into the hole , the outer cap is positioned inside the surface continuous with the diameter-enlarging surface. It is preferable to provide it. If the outer cap protrudes outward from the surface continuous with the expanded surface, the outer cap may be pressed around the hole and deformed when the fastener body is fastened. Because. In consideration of the dimensional error of the outer cap and the like, the outer cap is preferably provided so as to be positioned 0.1 mm or more inward from the surface continuous with the expanded surface.

The present invention is an aircraft assembly comprising a skin, a structural material that supports the skin from the inside, and a fastener that couples the skin and the structural material. It can also be characterized by being a lightning-resistant fastener described in any one of the above.
At this time, it is preferable that the top surface of the outer cap and the inner cap and the surface of the outer plate are formed to be flush with each other.

Moreover, this invention is a fastener member used in order to fasten a 1st member and a 2nd member, Comprising: While having a head part which has a shaft part and a larger outer diameter than a shaft part, A ring made of an insulating material is formed with a recess for applying a tool when fastening the fastener body and the fastening member, and an opening is formed on the outer peripheral side of the fastener member head to expose the recess at the center. It is also possible to feature that a cap-shaped cap is provided integrally.
A plug cap made of an insulating material covering the opening can be attached to the opening.

The present invention is a plug cap used in combination with the above-described fastener member, which is made of an insulating material, and is formed on the outer peripheral portion of the fastener member and is attached to an opening that exposes a recess, and a plate that closes the opening And a plug portion to be inserted into the recess.
The lightning fastener fastening method of the present invention is formed on the first member and the second member in order to fasten the second member on the inner side of the fuselage with respect to the first member constituting the aircraft fuselage. Fastener body provided to penetrate the hole from one side to the other side, fastening member mounted on the fastener body projecting to the other side of the first member and the second member, the first member, A fastening method for a lightning-resistant fastener, comprising: a fastener cap made of an insulating material provided to cover the fastener main body on one side of the second member, wherein the fastener main body includes the first member and the second member. On one side, it has a head having an outer diameter larger than the hole, and a recess is formed on the head to hang a tool when fastening the fastener body and the fastening member. A ring-shaped outer cap that is provided on the outer periphery of the head and has an opening that exposes a recess in the center; and an inner cap that covers the opening of the ring cap. A first step of inserting a fastener body provided with an outer cap into the hole, and mounting a fastening member on the fastener body; a second step of fastening a first member and a second member by applying a tool to the recess; Third step of providing an insulating sealant agent on the head of the fastener body, and a fourth step of covering the opening of the outer cap with the inner cap and interposing the sealant agent between the inner cap and the fastener body head. And comprising.
In the lightning fastener fastening method of the present invention, in the fourth stroke, it is preferable to fill the sealant agent between the inner cap and the head of the fastener body.
In the lightning fastener fastening method of the present invention, in the fourth step, it is preferable that the inner peripheral edge of the opening of the outer cap and the outer peripheral edge of the inner cap are engaged with each other.
In the lightning fastener fastening method of the present invention, in the third step, the sealant is filled in the recess, and in the fourth step, a part of the inner cap is inserted into the recess, and the sealant that is pushed out of the recess It is preferable to overflow from the gap between the cap and the head of the fastener body.
In the lightning fastener fastening method of the present invention, the inner cap includes a plate portion that closes the opening and has a through-hole penetrating both surfaces thereof, and a plug portion that is inserted into the recess. The sealant preferably overflows from the through hole.

According to the present invention, when fastening the first member and the second member, the tool can be hung on the recess exposed inside the opening of the outer cap provided on the head of the fastener body. . And after fastening, by attaching an inner cap to the opening part of an outer cap, and closing an opening part, the whole head of a fastener main body can be covered with an insulating material, and lightning-proof performance can be ensured.
In this way, it is possible to provide a lightning-resistant fastener that can sufficiently ensure insulation even when a tool is applied.

It is sectional drawing which shows the wing | blade panel and member joined by the fastener member in this Embodiment. It is sectional drawing which shows a part of head part of a fastener main body. It is a top view of the head of a fastener main part. It is a three-view figure of a plug cap. It is a figure which shows the other example of a plug cap. It is a figure which shows the further another example of a plug cap.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
FIG. 1 is a cross-sectional view of a part of a wing constituting an aircraft fuselage to which a lightning-resistant fastener, an aircraft assembly, a fastener member, and a plug cap according to the present embodiment are applied.
As shown in FIG. 1, the wing (aircraft assembly) 20 has an outer shell CFRP (conductive resin material) made of a metal material such as duralumin or a composite material of carbon fiber and resin (conductive resin material). It is formed by a wing panel (first member, outer plate) 21 made of Carbon Fiber Reinforced Plastics. Inside, there are structural materials for reinforcement, fuel tanks, various devices, stays for attaching these, etc. A member (second member, structural material) 22 is attached by a fastener member (lightning-resistant fastener, fastener) 30.

The fastener member 30 includes a pin-shaped fastener main body 31 and a collar 32 attached to the fastener main body 31 on the inner side of the wing 20.
The fastener body 31 and the collar 32 are generally formed of a metal material such as a titanium alloy or Inconel from the viewpoint of strength.

As shown in FIGS. 1 and 2, the fastener main body 31 having a pin shape is formed of a shaft portion 34 and a head portion 35 having an outer diameter larger than that of the shaft portion 34.
The shaft portion 34 has a screw groove 34a formed on the outer peripheral surface thereof, the tip end portion 34b has a smaller diameter than the shaft portion 34, and a screw groove 34c formed on the outer peripheral surface thereof.
The head portion 35 has a tapered diameter-expanding surface 35 a that gradually expands from the shaft portion 34. The fastener body 31 is inserted into the holes 21a and 22a formed through the wing panel 21 and the member 22 from the outside of the wing 20, and the enlarged diameter surface 35a at the rear end is abutted against the tapered surface of the hole 21a. In the state, the tip end portion 34 b is protruded inward of the wing 20.

The collar 32 has a cylindrical shape, and a thread groove 32 a that meshes with the thread groove 34 a of the shaft portion 34 is formed on the inner peripheral surface thereof. The collar 32 is screwed into the thread groove 34 a of the fastener body 31 protruding inward of the wing 20. Thus, the wing panel 21 and the member 22 are sandwiched between the enlarged diameter surface 35 a of the head portion 35 of the fastener body 31 and the collar 32, and the member 22 is fixed to the wing panel 21. A washer 36 is interposed between the collar 32 and the member 22.
In this state, the tip 34b of the shaft portion 34 of the fastener body 31 protrudes to the inner peripheral side of the wing 20 from the collar 32, and the thread groove 34c is exposed from the collar 32 to the inner peripheral side of the wing 20. ing.

A cap 25 is attached to the fastener member 30 on the inner space side of the wing 20.
The cap 25 is circular in cross section, and has a shape in which only the one end portion 25a side is open, and the inner diameter and outer diameter gradually decrease toward the other end portion 25b side. This cap is preferably formed of an insulating resin such as PPS (polyphenylene sulfide resin), polyimide, PEEK (polyether-ether-ketone resin), or nylon resin.
A bottomed hole (screw hole) 27 having a circular cross section is formed on the inner peripheral surface (hereinafter referred to as a bottom surface 26) of the cap 25 on the other end 25 b side. A thread groove 27a that meshes with the thread groove 34c of the fastener body 31 is formed on the surface. The cap 25 is configured such that the tip end portion 34 b of the fastener body 31 is inserted into the hole 27 in a state where the end surface of the one end portion 25 a is pressed against the member 22. At this time, the screw groove 27 a of the cap 25 is engaged with the screw groove 34 c of the fastener body 31, so that the cap 25 can be easily and reliably positioned and fixed to the fastener member 30.

In such a cap 25, the inner peripheral surface on the one end portion 25 a side of the hole 27 has a shape in which the inner diameter gradually increases, so that when the cap 25 is attached to the fastener member 30, A predetermined gap is formed between the peripheral surface and the fastener body 31 and the collar 32.
In a state where the cap 25 is attached to the fastener member 30, the cap 25 is filled with an insulating sealant 29 having an insulating property. Since the sealant 29 is interposed between the inner peripheral surface of the cap 25 and the fastener body 31 and the collar 32, the insulation between the cap 25 and the fastener member 30 is further enhanced.

  In the fastener main body 31, a recess (concave portion) 37 for applying a tool such as a wrench to rotate or fix the fastener main body 31 is formed on the head surface 35 b located on the surface side of the wing 20. . The recess 37 has, for example, a cross-sectional petal shape or a cross-sectional hexagonal shape according to the cross-sectional shape of the tool.

  As shown in FIG. 2, in the head portion 35 of the fastener main body 31, a convex portion 38 a that protrudes (increases in diameter) radially outward along the circumferential direction at the boundary portion between the enlarged diameter surface 35 a and the head surface 35 b. And a cap engaging portion 38 formed of a concave portion 38b which is formed continuously from the convex portion 38a and is recessed (depressed) radially inward along the circumferential direction. Each of the convex portion 38a and the concave portion 38b is formed so that the cross-sectional shape thereof is rounded (for example, processed so as to have a round (R) of about 0.1 mm to 0.3 mm). .

A fastener cap 40 is provided on the head 35 of the fastener body 31. The fastener cap 40 includes a ring cap (outer cap) 50 provided integrally with the head 35 of the fastener main body 31 located on the outer peripheral side, and a plug cap (inserted into the recess 37 positioned on the inner peripheral side). Inner cap) 60.
Each of the ring cap 50 and the plug cap 60 is formed of, for example, a thermoplastic resin (for example, polyetherimide (PEI) having a high dielectric breakdown voltage in addition to heat resistance and strength, excellent heat resistance and strength, and molding). Polyether ether ketone (PEEK) with excellent properties and versatility, heat resistance and strength, polyphenyl sulfide (PPS) with excellent moldability and versatility, and polyamideimide with particularly excellent heat resistance and strength (PAI)), thermosetting resin (for example, polyimide (PI) having particularly excellent heat resistance and strength), and the like.

  The ring cap 50 is provided on the outer peripheral edge portion of the head portion 35 of the fastener main body 31, and is recessed (depressed) radially outward along the circumferential direction on the inner peripheral side so as to engage with the cap engaging portion 38. ), A concave portion 51a that matches the convex portion 38a of the cap engaging portion 38, and a convex portion 51b that protrudes radially inward along the circumferential direction and matches the concave portion 38b of the cap engaging portion 38 are formed. ing.

The ring cap 50 has, on its outer peripheral side, a tapered portion 52 that is substantially continuous with the diameter-enlarged surface 35 a of the head portion 35 of the fastener body 31, and a ring portion 53 that extends along the head surface 35 b of the head portion 35.
Moreover, the outer peripheral surface 52a of the taper part 52 is formed so that it may be located inside 0.1 mm or more with respect to the virtual extension surface (refer dotted line (A) in FIG. 2) of the diameter-expanded surface 35a of the head part 35. . This is to prevent the ring cap 50 from abutting against the tapered surface of the hole 21a and deforming when the enlarged diameter surface 35a of the rear end portion of the fastener body 31 is abutted against the tapered surface of the hole 21a.

As shown in FIGS. 2 and 3, the ring portion 53 has an annular shape, and an opening 54 having an inner diameter larger than that of the recess 37 is formed at the center. In addition, a plurality of locking claws (engaging portions) 55 projecting inward are formed on the inner peripheral edge of the opening 54 on the side away from the head surface 35 b of the head 35.
Such a ring cap 50 is integrally formed on the head portion 35 of the fastener body 31 by injection molding. Here, the ring cap 50 is integrated with the fastener main body 31 because the concave portion 51 a and the convex portion 51 b are engaged with the cap engaging portion 38. Further, the thickness of each part of the ring cap 50 is, for example, about 0.6 mm to 1.0 mm so as to have a sufficient dielectric strength with respect to the lightning test voltage (about 40 kV) of MIL-STD-1757A Zone1. It is desirable that

  As shown in FIG. 4, the plug cap 60 is formed of a disk-shaped plate portion 61 that fits into the opening 54 of the ring cap 50, and a plug portion 62 that is inserted into the recess 37.

The plate portion 61 is formed with a plurality of through holes 63 penetrating the front and back surfaces thereof. These through holes 63 are for allowing the sealant 100 filled in the recess 37 to overflow to the outside when the plug portion 62 is inserted into the recess 37.
A flange portion (engagement portion) 61 a that protrudes to the outer peripheral side is formed on the outer peripheral edge portion of the plate portion 61. The flange portion 61 a engages with a locking claw 55 formed on the inner peripheral edge portion of the opening portion 54 of the ring cap 50, thereby preventing the plug cap 60 from dropping from the opening portion 54, and the plug cap 60. By giving a click feeling to the operator when the is pushed into the recess 37, it is possible to experience that the plug cap 60 has been pushed to the proper position.

The plug part 62 is formed of a post part 64 erected at the center part of the plate part 61, a bulk part 65, and a recess fitting part 66.
A plurality (three in the present embodiment) of the bristle portion 65 are formed radially around the axis of the post portion 64 and spaced apart from each other in the circumferential direction. The bristle portion 65 is provided so as to protrude from the tip end portion of the post portion 64 toward the outer peripheral side. The sealant agent 100 filled in the recess 37 enters between the bevel portion 65 and the plate portion 61 and hardens, so that the plug portion 60 is prevented from falling off from the recess 37 by the beak portion 65.
A plurality of recess fitting parts 66 (three in the present embodiment) radially centering on the axis of the post part 64 are spaced apart from each other in the circumferential direction and between the adjacent cage parts 65 in the circumferential direction. It is formed to be located. The plurality of recess fitting portions 66 have an outer diameter / shape corresponding to the inner diameter / shape of the recess 37, and are adapted to fit into the recess 37.

  The post portion 64, the cap portion 65, and the recess fitting portion 66 are integrally formed to form a plug portion 62, and the plug portion 62 as a whole has an outer diameter that goes toward the tip 62a. The taper shape gradually decreases.

  In such a fastener cap 40, as shown in FIGS. 2 and 3, the ring cap 50 is formed integrally with the fastener body 31 in advance. The panel 21 and the member 22 are well fastened by the fastener body 31 including the ring cap 50 and the collar 25. At this time, a fastening operation is performed by putting a tool on the recess 37 formed on the head 35 of the fastener body 31.

  As a result, the head surface 35b of the head portion 35 of the fastener body 31 is exposed on the outer peripheral surface side of the wing 20. In this state, the sealant 100 is filled in the recess 37 of the fastener body 31. Thereafter, the plug cap 60 is inserted into the recess 37. Then, as a whole, the plug portion 62 has a tapered shape in which the outer diameter gradually decreases toward the tip 62a, so that the plug portion 62 can be easily inserted into the recess 37 filled with the sealant 100.

  Then, the plug cap 60 is pushed into the recess 37, and when the flange portion 61 a of the plate portion 61 is engaged with the locking claw 55 formed on the inner peripheral edge portion of the opening portion 54 of the ring cap 50, The mounting to the recess 37 is completed. At this time, the surfaces of the plug cap 60 and the ring cap 50 are substantially flush with the wing panel 21. Further, since the flange portion 61a engages with the locking claw 55, it is possible to prevent the plug cap 60 from falling off after being mounted, and to feel that the plug cap 60 has been pushed to the proper position, so that the work can be performed reliably.

  Further, when the plug portion 62 is inserted into the recess 37, the sealant 100 in the recess 37 overflows from the recess 37. Initially, the sealant 100 is the head of the plate portion 61 and the fastener body 31. It overflows from the gap with the part 35. In the vicinity of the stage where the plate portion 61 is pushed in and the flange portion 61 a and the locking claw 55 engage with each other, the sealant agent 100 in the recess 37 overflows from the through hole 63 formed in the plate portion 61, The sealant 100 does not inhibit the insertion of the plug cap 60 into the recess 37.

After the plug cap 60 is inserted into the recess 37, when the curable sealant 100 is cured, the sealant 100 that has entered between the cap portion 65 and the plate portion 61 prevents the plug cap 60 from falling off the recess 37. it can.
Moreover, the plug cap 60 can be prevented from falling off from the recess 37 due to the frictional force generated by fitting the recess fitting portion 66 to the recess 37.

In this way, the fastener cap 40 composed of the ring cap 50 and the plug cap 60 allows the insulation and lightning resistance of the head 35 of the fastener body 31 to be secured even when a tool is applied to the recess 37 for mounting the fastener body 31. It can be secured. Moreover, since the plug cap 60 can be attached to the ring cap 50 with a single touch, the work is also easy.
Furthermore, since the upper surface of the ring cap 53 and the plug cap 60 of the ring cap 50 can be a flat surface that is substantially uniform with the surface of the wing 20, the aerodynamic performance is also excellent.

(Other embodiments)
By the way, it can replace with the plug cap 60 shown in the said embodiment, and can also use the cap which has another structure.
For example, plug caps (inner caps) 70 and 80 as shown in FIGS. 5 and 6 can be used. Here, the components common to the plug cap 60 described above are denoted by the same reference numerals, and the description thereof is omitted.

First, as shown in FIG. 5, the plug cap 70 includes a plate portion 61 that fits into the opening 54 of the ring cap 50, and a recess insertion portion 72 that is formed integrally with the plate portion 61 and inserted into the recess 37. Can be formed.
The plate portion 61 can employ the same configuration as the plate portion 61 of the plug cap 60 described above.

  The recess insertion portion 72 has a columnar shape having an outer diameter corresponding to the inner diameter of the recess 37. On the outer peripheral portion of the recess insertion portion 72, a protrusion 73 that is continuous in the axial direction of the recess insertion portion 72 and protrudes toward the outer periphery side is spaced apart in the circumferential direction of the recess insertion portion 72. Many are formed. Each protrusion 73 has a shape in which the cross-sectional area gradually decreases as it goes to the outer peripheral side of the recess insertion portion 72. Moreover, the front-end | tip part 72a of the recess insertion part 72 is made into the taper shape which an outer diameter reduces as it goes to a front-end | tip.

  When such a plug cap 70 is inserted into the recess 37, a large number of protrusions 73 on the outer peripheral side are locked to the recess 37 by a frictional force generated between the inner periphery of the recess 37. At this time, if the protrusion 73 is deformed when the recess insertion portion 72 is inserted into the recess 37, the frictional force becomes stronger.

In addition to this, also in the plate portion 61, if the flange portion 61 a is engaged with the locking claw 55 provided in the opening portion 54 of the ring cap 50, the plug cap 70 is prevented from dropping after being mounted. At the same time, the user can feel that the plug cap 60 has been pushed to the proper position, and the work can be performed reliably.
After the plug cap 70 is inserted into the recess 37, when the curable sealant agent 100 remaining in the gaps between the recess 37 and the many protrusions 73 is cured, the sealant agent 100 and the recess insertion portion 72 are interposed. Also due to the generated frictional force, the plug cap 60 can be prevented from falling off from the recess 37.

  In the example of FIG. 5, the recess insertion portion 72 shows an example in which the recess 37 is a stepped circle. Of course, the recess 37 may have other shapes, and the recess insertion portion 72 may have a shape corresponding to the shape of the recess 37.

Further, the plug cap 80 shown in FIG. 6 is formed of a plate portion 61 that fits into the opening 54 of the ring cap 50, and a recess insertion portion 82 that is formed integrally with the plate portion 61 and inserted into the recess 37. Can do.
The plate portion 61 can employ the same configuration as the plate portion 61 of the plug cap 60 described above.

In this example, it is assumed that the recess 37 has a shape for a Torx screw having a so-called cross-sectional petal shape. In this case, the recess insertion portion 82 has convex portions 82a projecting toward the outer peripheral side and concave portions 82b recessed toward the inner peripheral side, which are alternately and continuously formed in the circumferential direction according to the cross-sectional shape of the recess 37. Yes.
And the protrusion 82 which protrudes in the outer peripheral side is formed in the recessed part 82b along the axial direction of the recess insertion part 82. As shown in FIG. Each protrusion 83 has a shape in which the cross-sectional area gradually decreases as it goes to the outer peripheral side of the recess insertion portion 82.

When such a plug cap 80 is inserted into the recess 37, the protrusion 83 is elastically deformed by the convex portion 37a of the recess 37 having a petal cross section, and is locked to the recess 37 by the frictional force thereof. In addition to this, also in the plate portion 61, the flange portion 61 a engages with a locking claw 55 provided in the opening portion 54 of the ring cap 50.
Furthermore, after the plug cap 80 is inserted into the recess 37, if the curable sealant 100 remaining in the gap between the recess 37 and the recess insertion portion 82 is cured, the sealant agent 100 and the recess insertion portion 82 are Due to the frictional force generated therebetween, the plug cap 80 can be prevented from falling off from the recess 37.

In the above embodiment, the collar 32 and the cap 25 are attached to the fastener body 31 on the inner side of the wing 20. However, the configuration on the inner side of the wing 20 is not intended to be limited at all. Any other configuration may be employed as long as the two members can be fastened using the fastener body 31. Further, the object to be fastened using the fastener member 30 may be a member of the fuselage other than the wing 20.
In addition, the ring cap 50 and the plug caps 60, 70, and 80 may be changed, added, or deleted as long as they are within the scope of the present invention.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

  DESCRIPTION OF SYMBOLS 20 ... Wing (aircraft assembly), 21 ... Wing panel (first member, outer plate), 21a ... Hole, 22 ... Member (second member, structural material), 30 ... Fastener member (lightning-resistant fastener, fastener) 31 ... Fastener body, 32 ... Collar, 34 ... Shaft, 35 ... Head, 35a ... Expanded surface, 35b ... Head surface, 37 ... Recess, 40 ... Fastener cap, 50 ... Ring cap (outer cap), 52 ... Tapered part, 52a ... Outer peripheral surface, 53 ... Ring part, 54 ... Opening part, 55 ... Locking claw (engaging part), 60, 70, 80 ... Plug cap (inner cap), 61 ... Plate part, 61a ... Flange portion (engagement portion), 62 ... plug portion, 63 ... through hole, 64 ... post portion, 65 ... bevel portion, 66 ... recess fitting portion, 72, 82 ... recess insertion portion, 73, 83 ... protrusion, 100 ... sealant

Claims (18)

In order to fasten the second member on the inner side of the fuselage with respect to the first member constituting the aircraft fuselage, the holes formed in the first member and the second member from one side to the other Fastener body provided to penetrate to the side,
A fastening member attached to the fastener body protruding to the other side of the first member and the second member;
A fastener cap made of an insulating material provided to cover the fastener body on the one side of the first member and the second member,
The fastener main body has a head having an outer diameter larger than the hole on the one side of the first member and the second member, and the fastener main body and the fastening are on the head. A recess is formed to hang the tool when fastening the member,
The fastener cap is
A ring-shaped outer cap provided on the outer peripheral side of the head of the fastener main body, and having an opening for exposing the recess at the center;
An inner cap that covers the opening of the ring cap;
Equipped with a,
A lightning-resistant fastener , wherein an insulating sealant agent is interposed between the inner cap and the head of the fastener body . The lightning-resistant fastener according to claim 1, wherein the sealant is filled between the inner cap and a head of the fastener body. The lightning-resistant fastener according to claim 1 or 2 , wherein an engagement portion that engages with each other is formed on an inner peripheral edge portion of the opening portion of the outer cap and an outer peripheral edge portion of the inner cap. . 4. The lightning-resistant fastener according to claim 1, wherein top surfaces of the outer cap and the inner cap are formed flat. 5. The lightning-resistant fastener according to any one of claims 1 to 4, wherein the outer cap is formed by insert molding with respect to a head of the fastener body. The inner cap is
A plate portion that closes the opening;
A plug portion inserted into the recess;
The lightning-resistant fastener according to any one of claims 1 to 5 , further comprising: The lightning-resistant fastener according to claim 6 , wherein a through-hole penetrating both surfaces of the plate portion is formed. The recess is filled with an insulating sealant,
The through hole according to claim 7, characterized in that the plug part is the sealant is for discharging to the outside the sealant extruded from the recess when inserted into the recess filled Lightning-resistant fasteners described in 1. The lightning-resistant fastener according to any one of claims 5 to 8 , wherein the plug portion includes a bristle portion that is formed to protrude to an outer peripheral side at a distal end portion of the plug portion. The plug part has a plurality of protrusions protruding on the outer peripheral side on the outer peripheral part of the plug part,
The protrusion is deformed by abutting against an inner peripheral surface of the recess when the plug portion is inserted into the recess, and generates a frictional force between the plug portion and the recess. The lightning-resistant fastener according to any one of claims 5 to 9 . Wherein the head of the fastener body has a diverging surface having an outer diameter gradually enlarged from the portion to be inserted before Kiana,
The lightning-resistant fastener according to any one of claims 1 to 10 , wherein the outer cap is located on an inner side than a surface continuous with the diameter-enlarging surface. An aircraft assembly comprising an outer plate composed mainly of a resin material having conductivity, a structural material that supports the outer plate from the inside, and a fastener that couples the outer plate and the structural material. ,
It said fastener, aircraft assembly, characterized in that the lightning-protection fastener as claimed in any one of claims 1 11. The aircraft assembly according to claim 12 , wherein a top surface of the outer cap and the inner cap and a surface of the outer plate are formed to be flush with each other.   In order to fasten the second member on the inner side of the fuselage with respect to the first member constituting the aircraft fuselage, the holes formed in the first member and the second member from one side to the other A fastener main body that is provided penetrating to the first side, a fastening member that is attached to the fastener main body protruding to the other side of the first member and the second member, the first member, and the first member. A fastening method for a lightning-resistant fastener, comprising: a fastener cap made of an insulating material provided to cover the fastener body on the one side of the two members,
  The fastener main body has a head having an outer diameter larger than the hole on the one side of the first member and the second member, and the fastener main body and the fastening are on the head. A recess is formed to hang the tool when fastening the member,
  The fastener cap is provided on the outer peripheral side of the head of the fastener body, and has a ring-shaped outer cap in which an opening for exposing the recess is formed at the center, and an inner cap that covers the opening of the ring cap And comprising
  The fastening method is:
  A first step of inserting the fastener body provided with the outer cap on the head into the hole, and mounting the fastening member on the fastener body;
  A second step of applying the tool to the recess and fastening the first member and the second member;
  A third step of providing an insulating sealant on the head of the fastener body;
  A fourth step of covering the opening of the outer cap with the inner cap, and interposing the sealant agent between the inner cap and the head of the fastener body.
A method of fastening a lightning-resistant fastener characterized by the above. In the fourth step,
The lightning fastener fastening method according to claim 14, wherein the sealant is filled between the inner cap and the head of the fastener body.   The fastening of a lightning-resistant fastener according to claim 14 or 15, wherein in the fourth step, an inner peripheral edge of the opening of the outer cap and an outer peripheral edge of the inner cap are engaged with each other. Method.   In the third step, the sealant is filled in the recess,
  In the fourth step, a part of the inner cap is inserted into the recess, and the sealant pushed out from the recess is caused to overflow from a gap between the inner cap and the head of the fastener body. A method for fastening a lightning-resistant fastener according to any one of claims 14 to 16.   The inner cap includes a plate portion that closes the opening and is formed with a through-hole penetrating both surfaces thereof, and a plug portion that is inserted into the recess,
  The lightning fastener fastening method according to any one of claims 14 to 17, wherein, in the fourth step, the sealant overflows from the through hole.

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