JPH07172395A - Integral tank for aircraft - Google Patents

Abstract

PURPOSE:To provide an integral tank for an aircraft which is low in manufacturing cost and has a partition (a beam or a rib) made of a resin composite material preventing void and lamination. CONSTITUTION:A ventilation hole l and a hole 2 for conveying fuel having no a reinforcing flange are arranged in upper and lower position making contact with respective outer plates 10 and 10 of beam or a rib 3, made of a resin composite material, arranged in a state to make contact with the upper and lower outer plates 10 and 10 of an aircraft to form a partition plate. The shape of the beam or the rib 3 is simplified and in manufacture thereof, void and lamination are prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aircraft integral tank using a resin composite girder composed of resin as a matrix and fibers as a reinforcing material as a partition plate.

[0002]

2. Description of the Related Art As shown in FIG. 4, in an integral tank 100 in which a structure itself such as a main wing 101 to which an aircraft resin composite material is applied is used as a fuel tank, upper and lower outer plates 010, 010 facing each other are used. The space indicated by the diagonal lines in FIG. 4B is used as a tank, and a girder or rib 03 'is provided as a partition plate between the outer plates 010, 010.

As the girder 03 or the rib 03 ', a resin-based composite material is generally used which is obtained by laminating a prepreg obtained by impregnating a fiber as a reinforcing material with a resin and then molding and curing it.

As shown in FIG. 5 (in FIG. 5, the case of a girder is shown as a representative), a vent 03 with a triangular cross section is provided in the upper part, and a triangular cross section is provided in the lower part with a triangular cross section for the fuel transfer. Although the hole 02 is provided, the girder 03 using the resin-based composite material
In the above, in order to avoid a decrease in strength due to the stress in response to the holes 01 and 02, a reinforcing flange 06 is provided around these holes.

When manufacturing the girders 03 or ribs 03 'of the resin-based composite material, as shown in FIG.
And prepregs in which fuel transfer holes 02 are cut off in a triangular shape are laminated, and then molded with a mold 020 to form a girder 03 or rib 0.
Two pieces of the same shape with a U-shaped cross section corresponding to half of 3'03
Create a. These two materials 03a, 03a are shown in Fig. 6 (b).
As shown in, the upper and lower jigs 021,
Placed between 022, put filler 04 between materials 03a and 03a, cover jigs 021 and 022 and girder materials 03a and 03a with a molding bag, pressurize and cure by applying pressure in the autoclave. Then, the girder 03 or the rib 03 'is created.

At this time, the vent hole 01 and the fuel transfer hole 0
Since it is necessary to provide a reinforcing flange 06 at the portion around 2, as shown in FIG. 6B, two materials 03a, 03a
A flange material 07 that forms the reinforcing flange 06 and a block 08 that supports the flange material 07 are inserted into this part of the ridge, and these are housed in the forming bag together with the material 03a and the jigs 021 and 022. It is pressurized within to form the reinforcing flange 06.

[0007]

In manufacturing the girders or ribs of the above-mentioned conventional integral tank, in addition to the materials of the two girders and ribs, the flange material forming the reinforcing flange is used as the upper and lower jigs. Since they are put in and are put in the forming bag, the work is complicated and difficult, and a large number of man-hours are required, and the structure becomes complicated by providing the flanges for the ventilation hole and the fuel transfer hole, and However, there is a problem that defects such as voids and delamination are likely to occur.

The present invention is intended to provide an aircraft integral tank capable of solving the above problems.

[0009]

SUMMARY OF THE INVENTION An aircraft integral tank of the present invention comprises a resin composite girder or rib which is placed in contact with upper and lower outer skins of an aircraft to form a partition plate, and the same. It is characterized in that it is provided with a vent hole and a fuel transfer hole which are provided at upper and lower positions in contact with the outer plate of the girder or the rib and have no reinforcing flanges.

[0010]

In the present invention, since the girders or ribs made of the resin-based composite material are provided at the upper and lower positions in contact with the outer skin of the aircraft, the ventilation holes and the fuel transfer holes having a simple shape without a flange are provided. The manufacturing die, jig, etc. are simplified, the shape of the prepreg is also simplified, and the prepregs are easily laminated, and the man-hours required for processing are also reduced, so that the cost can be reduced.

Further, as described above, since the simple shape is adopted, voids and delamination are not generated in the manufacture of the resin-based composite material girder or rib having the vent hole and the fuel transfer hole. It is prevented from occurring.

Further, since the vent hole and the fuel transfer hole do not have a reinforcing flange, the shape of the hole can be appropriately selected and the size thereof can be reduced to reduce the influence of stress concentration. It is possible, and if reinforcement of the vent and fuel transfer holes is required by not having a reinforcing flange, this can be dealt with by a simple method of reinforcing the web surface of the girder or rib. You can

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. This embodiment relates to an integral tank in which the structure of the main wing itself is used as a fuel tank, similar to that shown in FIG.

The girders or ribs 3 forming the partition plate of the integral tank are made of a resin composite material, and both ends thereof are attached to the upper and lower outer plates 10, 10 of the main wing as shown in FIG. A vent hole 1 is provided in an upper portion where the girder or rib 3 contacts the upper outer plate 10, and a fuel transfer hole 2 is provided in a lower portion where the girder or rib 3 contacts the lower outer plate 10.
Further, a fuel transfer hole 2a is provided in the vertical middle of the girder or rib 3. As shown in FIG. 1, the vent hole 1 and the fuel transfer hole 2 have a semi-elliptical cross section that is long in the vertical direction, and the fuel transfer hole 2a has a circular cross section. No reinforcing flanges are provided on 1, 2, and 2a.

The manufacturing process of the girder or rib 3 will be described below. As shown in FIG. 2 (a), a laminate of prepregs having a vent hole 1 and fuel transfer holes 2 and 2 a is formed by a mold 20 and has a U-shaped cross section corresponding to half of a girder or rib 3. Two materials 3a having the same shape are created. These two materials 3
As shown in FIG. 1 (b), a and 3a are placed back to back between upper and lower jigs 21 and 22, and a filler 4 is placed between them, and pressure is applied to the girder or rib. Form the material. At this time, the vent hole 1 and the fuel transfer holes 2, 2
In order to form a in the material 3a, prepregs whose holes are cut off may be laminated, or the holes may be cut in a laminated body of prepregs.

The ventilation hole 1 and the fuel transfer holes 2 and 2a of the girder material or rib material molded as described above are filled with a molding filler for preventing resin from entering, and as shown in FIG. Placed on the outer plate 10 of this, this girder material or rib material and the outer plate 1
0 is arranged between the upper mold 24 and the lower mold 25, and these are covered with the molding bag 23, and then the autoclave pressure p is applied in the autoclave to cure them to form the beams or ribs 3 and the beams or ribs 3. Integral molding is performed, which is fixed to the lower outer plate 10.

As described above, since the girder or rib 3 is made of the two raw materials 3a having a simple shape, voids and delamination do not occur during the hardening and molding of the material, so that the girder or rib 3 is sufficient. It will also have strength.

Further, since the vent hole 1 of the girder or rib 3 and the fuel transfer holes 2 and 2a do not have a reinforcing flange, they have a substantially oval or round simple shape as described above, and The size can be reduced, and the influence of stress concentration can be reduced.

Further, since the girder or rib 3 has a simple shape without a reinforcing flange, the mold, jig, etc. used to manufacture the girder or rib 3 are simple, and the shape of the prepreg is also simple. Lamination can be facilitated, and it is not necessary to insert a member for forming a reinforcing flange into a mold, a jig, a molding bubbling or the like, and the number of steps can be significantly reduced.

[0020]

As described above, according to the present invention, by having the structure described in the claims, the girders or ribs made of the resin composite material forming the partition plate of the integral tank have a simple shape. Can be
It is possible to reduce the influence of stress concentration, satisfy the strength requirement, reduce the manufacturing cost, and suppress the generation of voids and delamination during the manufacturing to improve the quality.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 (a) is a perspective view thereof, and FIG. 1 (b) is a sectional view taken along the line AA of FIG. 1 (a).

FIG. 2 (a) is a perspective view showing a molding state of a girder or rib material in the same embodiment, and FIG. 2 (b) is a sectional view showing a state of molding a girder material or rib material from the same material. is there.

FIG. 3 is a perspective view showing a state where the girder or rib and the outer plate are integrally molded by the molding bag of the embodiment.

FIG. 4 shows an integral tank of a conventional aircraft, FIG. 4 (a) is a perspective view of a main wing portion, and FIG. 4 (b) is FIG.
It is a BB arrow sectional drawing of (a).

FIG. 5 shows a part of a girder of an integral tank of a conventional aircraft, FIG. 5 (a) is a perspective view thereof, and FIG. 5 (b) is a sectional view thereof.

FIG. 6 (a) is a perspective view showing a state in which a material of a girder or rib of an integral tank of a conventional aircraft is formed.
FIG. 6B is a sectional view showing a state in which the girders or ribs are formed from the same girder or rib material.

[Explanation of symbols]

 1 Vent hole 2, 2a Fuel transfer hole 3 Girder or rib 3a Girder or rib material 4 Filler 10 Outer plate 20 type 21, 22 jig 23 Forming bug 24 Upper mold 25 Lower mold 100 Integral tank 101 Main wing

Claims (1)

[Claims] 1. A girder or rib made of a resin-based composite material, which is arranged in contact with upper and lower outer plates facing an aircraft to form a partition plate, and is provided at upper and lower positions in contact with outer plates of the same girder or rib, respectively. An integral tank for an aircraft, which is provided with a vent hole and a fuel transfer hole that do not have the specified reinforcing flange.