JPH0455193A - Shock absorbing support device for fuel tank container - Google Patents

Abstract

PURPOSE:To ensure light weight and rigidity and to absorb shock of a tank at a crash or a fall of a helicopter by providing a shock absorbing member integrally attached or upper and lower surfaces of a honeycomb core through an adhesive between a fuel tank bottom surface and a body frame. CONSTITUTION:As for a shock absorbing member 13, an upper surface plate 15a and a lower surface plate 15b are integrally formed on upper and lower surfaces of a honeycomb core 12 through an adhesive 14, and a plurality of flanges 16 provided on the upper surface plate 15a and a side of a ferry tank 11 are fixed through a plurality of screws 17. When a large lateral load is received by a side wall of the ferry tank 11, the upper surface plate 15a, an upper core 12a and an intermediate plate 19 are integrally attached through an adhesive 20 so as to make them bear strength and rigidity as a strength member, and a lower core 12b and the lower surface plate 15b are integrally attached through the adhesive 20 so as to obtain-such structure that shock absorbing performance is born.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a shock absorbing support device for a fuel tank container mounted on a helicopter, etc., and more specifically, it relates to a shock absorbing support device for a fuel tank container mounted on a helicopter, etc. This invention relates to a shock absorbing support device for a fuel tank container that absorbs and alleviates the shock force caused by the impact.

[Conventional technology]

Generally, when a container containing a product is transported or transported by truck or aircraft, a method of mitigating the impact of dropping or colliding is to combine the product W and container 1 (packing box), for example, as shown in Figure 5. It is known to interpose a cushioning material 2 such as styrofoam, soft urethane foam, paper honeycomb core, or aluminum honeycomb core between the inner surface of the housing and the inner surface of the housing.

In addition, for helicopters etc., in order to extend the cruising distance,
A ferry tank (additional fuel tank) may be installed.

Modern helicopters are required to be survivable in the event of a crash, and are equipped with impact-resistant rubber tanks to prevent the fuel tank from rupturing.

In other words, when analyzing the causes of death based on conventional accident cases, it was found that in many cases, occupants injured during a crash ignited leaked fuel and died in a fire. requested.

[Problem that the invention seeks to solve]

However, in the case of the container 1 with the cushioning material 3 interposed in the former case, it is necessary to have a heavy structure in order to maintain the strength of the container 1 itself, and therefore the rigidity of the container 1 is reduced. Because of its large size, there was a problem in that it could not absorb a large impact load (landing load when falling in the air).

Furthermore, in the case of the latter fuel tank, if a large ferry tank were to be manufactured from rubberized cloth, the strength would be complicated, and the structural weight would become extremely large, resulting in insufficient bay load.

[Purpose of the invention]

This invention was devised by focusing on such conventional problems, and focused on the shock absorbing effect of honeycomb cores and honeycomb cores as core materials for lightweight structural materials. A shock absorbing member is interposed between the frame and the upper and lower surfaces of the honeycomb core, which is made up of a top plate and a bottom plate that are integrally attached via a contact agent, making it lightweight and rigid.
It is an object of the present invention to provide a shock absorbing support device for a fuel tank container, which absorbs and alleviates the shock force acting on a fuel tank when a helicopter crashes or drops.

[Failure to solve the problem]

In order to achieve the above object, the present invention provides a shock absorbing member in which an upper plate and a lower plate are integrally attached to the upper and lower surfaces of a honeycomb core with an adhesive between the bottom of the fuel tank and the fuselage frame. The gist of this is that it is constructed by intervening.

The above shock absorbing member is made by dividing the honeycomb core into upper and lower parts,
The gist of this is that it is integrally constructed into a multilayer structure with an intermediate plate interposed therebetween.

[Action of the invention]

The present invention is constructed as described above, and includes a shock absorbing member in which a top plate and a bottom plate are integrally attached to the top and bottom surfaces of a honeycomb core via adhesive between the bottom of the fuel tank and the fuselage frame. By intervening, it absorbs and alleviates the impact force that acts on the fuel tank when the aircraft crashes or falls, and can prevent burnout incidents.

[Embodiments of the invention] Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a perspective view of a shock absorbing support device 10 for a fuel tank container according to the present invention, and an aluminum honeycomb structure is formed between the bottom of a ferry tank 11 (fuel tank for tank expansion) and the fuselage (not shown). A shock absorbing member 13 whose core material is a honeycomb core I2 such as a seta-aramid fiber honeycomb core impregnated with a phenol resin (Nomex: a trade name of DuPont) or a paper honeycomb core is interposed.

As shown in FIG. 2, the shock absorbing member 13 is attached to the top plate 1 on the top and bottom surfaces of the honeycomb core 12 via an adhesive 14.
5a and a lower plate 15b are integrally molded, and the upper plate 15a and a plurality of flange members 16 provided on the side surface of the ferry tank 11 are fixed via a plurality of screws 17. .

The thickness H of the honeycomb core 12 is set to be sufficient to prevent the ferry tank 11 from being destroyed by the impact load and absorb necessary impact energy when the aircraft crashes or falls. Further, as the material for the upper surface plate 15a and the lower surface plate 15b, aluminum alloy or fiber-reinforced plastic is preferable, and the thickness of the plate can be arbitrarily designed based on the load required when lifting the ferry tank 11 from the viewpoint of strength and weight reduction. It is up to you to decide.

In addition, when the ferry tank 11 as described above receives a large lateral load on the side wall, the ferry tank 11
Since a large stress acts on the screw seat 18 attached to the bottom of the screw seat, it is necessary to make the screw seat 18 strong.

At this time, if the screw seat 18 is enlarged, the honeycomb core 12
In order to reduce the impact absorption effect of It is integrally constructed with a multilayer structure interposed therebetween.

As a result, the upper surface plate 15a and the upper core '+A' 12a.

The intermediate plate 19 is integrally bonded via an adhesive 20 to provide strength and rigidity as a strength member, and the intermediate plate 19.
By integrally adhering the lower core material 12b and the lower surface plate 15b via the adhesive 20, a structure in which impact absorption performance is provided becomes possible.

Note that the lower core material 12b is freely designed so as to satisfy the necessary shock absorption characteristics.

Note that FIG. 4 shows an example of the mounting of the screw seat 18 in FIG. 3.

This invention has the above-mentioned structure, and by interposing the shock absorbing member 13 between the bottom surface of the ferry tank 11 and the fuselage frame, the impact acting on the fuel tank when the aircraft crashes or falls is absorbed. It absorbs and alleviates force and can prevent burns to death.

[Effects of the Invention] This invention provides a method of integrally attaching an upper surface plate and a lower surface plate to the upper and lower surfaces of a honeycomb core with an adhesive between the bottom surface of a fuel tank and the fuselage frame as described in Section 2. By arbitrarily selecting the buckling strength and thickness of the aluminum honeycomb core, the fall impact acceleration can be reduced to 1/10 to 1/100 of that of the conventional aluminum honeycomb core.
It can absorb and alleviate the impact force that acts on the fuel tank when a helicopter crashes or falls, and prevents burnout. 2. When installing the fuel tank, the thickness of the fuel tank plate can be reduced to 1710 mm or less, Therefore, it has the effect of reducing weight and cost, and furthermore, it becomes easy to design and manufacture an air-drop type fuel tank container.

In addition, the shock absorbing member is made by dividing the honeycomb core into upper and lower parts.
Since it is integrated into a multilayer structure with an intermediate plate,
The screw seats are firmly attached, so it is possible to manufacture a fuel tank that can withstand large lateral loads.
Since the honeycomb panel having rigidity and the honeycomb core for shock absorption are separated, it is easier to design the shock absorption function, and it is possible to manufacture a fuel tank container with lower shock acceleration.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a shock absorbing support device for a fuel tank container embodying the present invention, FIG. 2 is an enlarged side view of the X section in FIG. 1, and FIG. 3 is a diagram showing another embodiment of the present invention. FIG. 4 is a side view showing how the screw seats are installed, and FIG. 5 is a sectional view of a conventional fuel container. DESCRIPTION OF SYMBOLS 10... Shock absorption support device, 11... Ferry tank, 12... Honeycomb core, 13... Shock absorption member, 14... Adhesive, 15a... L-face plate, 15b...
・Bottom plate, 17...Screw, 18...Screw seat, 19.
...Intermediate plate, 20...adhesive. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Claims] 1. A shock absorbing member is interposed between the bottom of the fuel tank and the fuselage frame, and the upper and lower plates are integrally attached to the upper and lower surfaces of the honeycomb core with an adhesive. 1. A shock absorbing support device for a fuel tank container, characterized in that the device is constructed of: 2. The shock absorbing support device for a fuel tank container according to claim 1, wherein the shock absorbing member is integrally formed into a multilayer structure by dividing a honeycomb core into upper and lower parts and interposing an intermediate plate.