JPH0751997Y2 - Hole plug for injection seal on composite skin - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a plug for a hole for injection sealing of a composite material outer plate applied to an integral tank part of an aircraft.

[Conventional technology]

Inside the main wing of the aircraft, as shown in FIG. 7 and FIG.
Is provided with a fuel tank area 17 which is partitioned into two parts. The outer plates 12, 16 and the girder member 14 and the force bone 15 are connected by a countersunk bolt 18, and the plug 1 is provided on top of the girder member 14 and the force bone 15. A groove sealing groove 13 in which is disposed is provided.

As shown in FIG. 9, the conventional plug 11 is such that a sealant injection hole is formed in an upper surface side outer plate (made of metal) 12, a thread is formed in the inner surface, and the hole is screwed into the hole.

When the upper surface side outer plate 12 is a composite material product, when the screw is cut,
Since cracks and fractures occur from there, it is not possible to adopt the structural style shown in FIG. 8 in the composite material product, and there has been no prior art for the composite material product.

[Problems to be solved by the device]

When attempting to attach a perforated plug to the upper surface outer plate made of a composite material, there were the following problems.

(1) It is necessary that the inner surface of the sealant injection hole provided in the composite outer plate is not scratched when the plug is attached or detached.

(2) It is necessary to be able to easily mount the plug after injecting the sealant and remove the plug for repairing the sealing.

(3) The plug installed after the sealant is injected needs to have a sealing effect so that the injected sealant does not leak.

(4) After mounting the plug, it is necessary that the plug does not come off due to the pressure of the injected sealant and the overall vibration.

(5) Types of plugs (types of plugs whose dimensions must be changed depending on the thickness, etc.) even if the thickness or shape of the composite outer plate changes
It is desirable that the shape of the plug and the shape of the hole be small so that the number of plugs is small.

The present invention is intended to provide a plug that solves the above problems.

[Means for Solving the Problems]

The plug of the injection seal hole of the composite material outer plate of the present invention is made of a rubber material and is formed by the upper dish head portion, the middle cylindrical portion, and the lower tapered thick portion, and the upper stepped portion. With a through hole having a through hole, a stem having an upper stepped shape portion and a lower stepped shape portion inserted from above into the through hole of the sleeve, and a screw hole provided on the upper surface of the stem. It is characterized in that it is provided with a machine screw to be inserted into an injection sealing hole which is provided on the composite outer plate and is composed of an upper dish-shaped portion, an intermediate circular shape portion and a lower dish-shaped portion.

[Action]

In the above, when attaching the plug to the hole for injection seal, after opening the above hole in the composite material outer plate and injecting the sealant through the hole, the sleeve in which the lower stepped shape part of the stem is pushed into the cylindrical shape part Is inserted into the above hole. Since the sleeve is made of a rubber-based material, it does not scratch the inner surface of the hole, and the tip is tapered to allow easy insertion. You can keep your sex.

After the insertion of the sleeve into the hole is completed, the stem is further pushed in to spread the tapered thick-walled shape portion of the sleeve, and the tapered thick-walled shape portion is placed on the inner surface of the lower countersink shaped portion of the hole. Make them adhere closely. This prevents the sealant from leaking to the outside and prevents the sleeve from being pushed out by the sealant pressure, etc.The stepped part of the upper part of the stem is supported by the stepped part of the sleeve, and the sealant pressure etc. It is supposed that the stem is not pushed out.

After the pushing of the stem is completed, a small screw is attached to the screw hole of the stem to complete the work.

Next, when pulling out the plug from the hole, the small screw is removed, a dedicated tool is attached to the screw hole, and the plug is pulled out by the dedicated tool.

In this case, when the special tool is pulled up, the stepped part of the stem deforms and the stepped part of the sleeve is deformed, but when the special tool is further raised, the tapered thick-walled part of the sleeve is the original tapered shape. The lower stepped portion is fixed to the stepped portion of the sleeve so that the sleeve is pulled out together with the stem.

The injection seal hole can be changed by changing the dimension of the hole under the lower countersink shape part so that the upper countersink shape, the intermediate circular shape part and the lower part can be changed even when the thickness or shape of the composite outer plate changes. The dish-shaped portion can have a fixed size and shape, and the type of plug can be limited.

Due to the above, there is no scratch on the inner surface of the injection seal hole provided in the outer plate made of the composite material at the time of attachment / detachment, and there is no extrusion to the outside due to the sealant pressure, etc., and the sealant adheres well to the inner surface of the hole. We have achieved a plug that can be easily attached to and detached from the injection seal hole because it can be used with a small number of types even if the thickness or shape of the outer plate changes, while preventing leakage of water.

〔Example〕

 An embodiment of the present invention will be described with reference to FIGS.

The plug 1 of this embodiment shown in FIGS. 1 and 2 has an injection sealing hole 5 composed of an upper plate-shaped portion 5a, a circular shape portion 5b and a lower plate-shaped portion 5c shown in FIG. 3 (a).
Is made of a flexible rubber material (including synthetic rubber) and has an outer shape of a dish head shaped portion 2a in the upper portion, a cylindrical shaped portion 2b in the middle portion, and a tapered thick portion 2c in the lower portion. A through-hole 2d having a stepped portion 2e formed in the upper part and vertically penetrating through the sleeve 2, and a stem 3 having an upper stepped shape portion 3a and a lower stepped shape portion 3b inserted into the through-hole 2d of the sleeve 2 from above. , And a screw hole 3c provided on the upper surface of the stem 3 for screwdriver or hexagon wrench on the upper surface.
It has a machine screw 4 provided with 4a.

In the above, when the plug 1 is attached to the injection seal hole 5, as shown in FIG. 3 (a), the injection seal hole 5 is opened in the upper surface side outer plate 12 and the sealant for sealing is formed in the groove 13 for group sealing. After filling 19, the sleeve 2 in which the lower stepped portion 3b of the stem 3 is pushed into the cylindrical portion 2b from above is inserted into the hole 5 as shown in FIG. 3 (b). The tip of the lower stepped portion 3b has a hemispherical shape so that it can be easily inserted into the sleeve 2.

The sleeve 3 is made of a rubber material so as not to scratch the inner surface of the hole 5 formed in the upper surface outer plate 12 made of a composite material, and the lower portion is tapered so as to be easily inserted into the hole 5. The thick-walled portion 2c is formed, and after insertion, the upper portion is formed into the dish-headed portion 2a so that the surface of the outer plate 12 can maintain smoothness. When the lower stepped shape portion 3b of the stem 3 is inserted into the through hole 2d of the sleeve 2 from above, since the sleeve 2 is made of a rubber material, the step portion 2e is deformed and the stem 3 can be inserted. I am trying.

After the insertion of the sleeve 2 into the hole 5 is completed, a dedicated tool for pushing the stem 3 in as shown in FIG. 3 (c).
20 is attached to the screw hole 3c of the stem 3, and the stem 3 is pushed into the through hole 2d of the sleeve 2 by the dedicated tool 20 to obtain the state shown in FIG. 3 (d).

When the stem 3 is pushed in and descends, the tapered thick-walled shape portion 2c of the sleeve 2 is spread by the stem 3, and the lower part of the sleeve 2 is brought into close contact with the inner surface of the lower dish-shaped shape part 5c of the hole 5, and the sealant 19 It is supposed that the leakage to the outside is prevented and the sleeve 2 is not pushed out by the sealant pressure or the like.

Further, the stem 3 is made of a metal material because it needs to be threaded. The stepped portion 2e of the sleeve 2 supports the upper stepped portion 3a of the stem 3, and the stem 3 is pushed out by the sealant pressure or the like. It is supposed not to be done.

The force acting on the stem 3 and the sleeve 2 is
As shown in the figure, when the stem 3 is pushed into the through hole 2d of the sleeve 2 by the force A, the forces B, C act from the side portions of the stem 3 and the forces D, E, F, G are exerted on the sleeve 2. Occurs, the inner surface of the hole 5 is pressed and the sleeve 2 comes into close contact with the inner surface of the hole 5, and the sealant pressure H causes the sleeve 2 and the stem 3 to move.
When forces I and J are respectively applied to the upper and lower sides, the lower plate-shaped portion 5c of the hole 5 and the stepped portion 2e of the sleeve 2 are respectively supported.

After the pushing of the stem 3 is completed, the special tool 20 is removed and the machine screw 4 is screwed in to complete the work. The machine screw 4 needs to be threaded on the outer periphery and is made of metal, and the upper surface thereof is flush with the surface of the sleeve 2.

Next, the case where the plug 1 is removed from the injection seal hole 5 will be described with reference to FIG.

To remove the plug 1, first, remove the small screw 4 as shown in FIG. 4 (a), and remove the stem 3 into the screw hole 3c of the stem 3 as shown in FIG. 4 (b). twenty one
Is attached, and the plug 1 is pulled out by the special tool 21 as shown in FIG. 4 (c).

In pulling out the stem 3, when the dedicated tool 21 is pulled up, the stepped portion 2e of the sleeve 2 in the upper stepped shape portion 3a of the stem 3 is deformed and pulled out. Since the tapered thickened portion 2c of 2 returns to the original tapered shape, the lower stepped shaped portion
3b is fixed to the step portion 2e of the sleeve 2, and the sleeve 2 is pulled out together with the stem 3. Note that FIG. 4 (d) shows a processing procedure when the stepped portion 2e of the sleeve 2 is damaged and the sleeve 2 remains in the hole 5, and a dedicated tool 22 used at that time.

The injection seal hole 5 into which the plug 1 is inserted will be described with reference to FIG.

In FIG. 6 (a), the upper countersink-shaped portion 5 a of the hole 5 has the same shape as the countersunk head-shaped portion 2 a of the sleeve 2 and has a circular shape.
The inner surface dimension of 5b has an appropriate hole diameter so that the sealant 19 does not leak when the sleeve 2 is pushed out by the stem 3, and the lower countersink-shaped portion 5c is formed at the tip of the sleeve 2. It has an appropriate dishing shape so that it can be brought into close contact with the sleeve 2 when the tapered thick portion 2c is spread. The lower side of the lower dish shape portion 5c is a passage for injecting the sealant, and the thickness and shape of the upper surface side outer plate 12 change as shown in FIGS. 6 (b), (c) and (d). Even in such a case, the hole serves as a relief for keeping the hole shape of the portion where the plug is inserted constant so that the plug 1 having the same size can be mounted without changing the size of the plug 1.

Due to the above, there is no scratch on the inner surface of the injection seal hole provided in the outer plate made of the composite material at the time of attachment / detachment, and there is no extrusion to the outside due to the sealant pressure, etc., and the sealant adheres well to the inner surface of the hole. We have achieved a plug that can be easily attached to and detached from the injection seal hole because it can be used with a small number of types even if the thickness or shape of the outer plate changes, while preventing leakage of water.

[Effect of device]

The plug of the injection seal hole of the composite outer plate of the present invention does not scratch the inner surface of the hole because the sleeve is made of rubber material, and can be inserted into the hole because the tip of the sleeve is tapered. After installing the plug into the hole, the stem makes the sleeve closely contact the inner surface of the hole to prevent the sealant from leaking, and the tapered thick-walled shape of the sleeve makes good contact with the lower countersink shape of the hole. Also, since the upper stepped shape part of the stem is in close contact with and supported by the stepped part of the sleeve, it is not extruded to the outside due to sealant pressure, etc., and there are few types even if the thickness or shape of the outer plate changes. A plug that can be easily attached to and detached from the injection hole has been realized.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the above embodiment, and FIG. 3 is an explanatory view of how to insert a plug according to the embodiment into an injection seal hole. Fourth
FIG. 5 is an explanatory view of the procedure for removing the plug according to the above-mentioned embodiment, FIG. 5 is an explanatory view of the action of force in the mounted state of the above-mentioned embodiment, and FIG. 6 is mounted with the plug according to the above-mentioned embodiment. FIG. 7 is an explanatory view of holes for injection seals, FIG. 7 is an explanatory view of a main wing of an aircraft to which the above-mentioned embodiment is applied, FIG. 8 is a detailed view of a portion VIII in FIG. 7, and FIG. 9 is a description of a conventional device. It is a figure. DESCRIPTION OF SYMBOLS 1 ... Plug, 2 ... Sleeve, 2a ... Disc-shaped section, 2b ... Cylindrical section, 2c ... Tapered thick section, 2d ... Through hole, 2e ... Step section, 3 ... Stem, 3a, 3b ... Stepped Shaped part, 3c ... Screw hole, 4 ... Machine screw, 4a ... Driver hole, 5 ... Injection seal hole, 5a, 5c ... Dish-cutting shape part, 5b ... Circular shaped part, 12 ... Top side outer plate, 13 ... Groove sealing groove, 14
… Girder member, 15… Strong bone, 19… Sealant for sealing.

Claims (1)

[Scope of utility model registration request] 1. A sleeve which is made of a rubber-based material and which is formed by an upper dish head-shaped portion, an intermediate cylindrical portion and a lower tapered thick-walled portion and which has a stepped portion at the top and which vertically penetrates, The sleeve is provided with a stem having an upper stepped portion and a lower stepped portion which are inserted into the through hole of the sleeve from above, and a machine screw screwed into a screw hole provided on the upper surface of the stem. A plug for an injection seal hole of a composite material outer plate, which is inserted into an injection seal hole formed on an outer plate and has an upper dish-shaped portion, an intermediate circular shape portion, and a lower dish-shaped portion.