JPH05340438A - Impact absorber - Google Patents

Abstract

PURPOSE:To secure an impact absorber that is able to absorb any striking energy efficient enough by applying it to a road, a quay side wall, the floor and wall of a building requiring the absorption and easement of an impact and/or a bumped part, etc., of an automobile or the like. CONSTITUTION:This impact absorber is one that is properly combined into unification with a resin compact A, where plural pieces of arch, domelike or honeycomb compressive deformed parts are erected on a plate, having such a cushioning property as 2kg/cm<2>50kg/cm<2> in apparent modulus of longitudinal elasticity in time of compression and more than 50% in compression stroke and a flexible plate B being high in bending elastic modulus (50000kg/cm<2>).

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is applied to roads and side walls of quays, floors and walls of buildings, shock absorbers of automobiles, etc., which require absorption and relaxation of impacts, thereby efficiently applying impact force. The present invention relates to a shock absorber capable of absorbing and relaxing.

[0002]

2. Description of the Related Art A conventional shock absorber is a metal spring,
There are friction shock absorbers, hydraulic shock absorbers, rubber moldings and the like, and a combination of these is also used. However, although the metal spring has an excellent cushioning property, it has almost no energy absorbing ability. Friction shock absorbers and hydraulic shock absorbers generally have a complicated structure and are expensive, and have a problem that the spring constant has a very large dependency on the deformation speed and there is no restorability.

In addition, these shock absorbers are greatly restricted by the environment in which they are difficult to use in water, and maintenance such as rust prevention and waterproofing is essential. Rubber molded products have the characteristic of good resilience, but since the elastic modulus of the material is low, it is necessary to increase the amount of material used in order to secure a satisfactory shock absorption amount. It is heavy and difficult to upsize. Further, although these shock absorbers are convenient for cushioning a narrow pressure receiving portion, they are not suitable for a structure having a uniform cushioning property over a wide area such as a road side wall or a floor or wall of a building.

[0004]

Under the above circumstances, the inventors of the present invention have developed a shock absorber which is lightweight, has an excellent shock absorbing effect, and has a uniform cushioning property over a wide area. As a result of intensive research conducted for the purpose of development, shock absorption consisting of a resin molded product with cushioning properties in which a plurality of arch-shaped, dome-shaped or honeycomb-shaped compression deformation parts are erected on a flat plate with or without holes. He developed his body and filed a patent application first.

However, in this shock absorber, the rigidity in the direction perpendicular to the compression axis is weak, and when compressing in the axial direction, the compressively deformable portion is liable to bend in the lateral direction, and as a result, the stress in the compressing direction is caused in the lateral direction. It was also found that there is a problem in that the yield strength in the compression direction tends to be lower than the design value due to dispersion. Such a problem tends to become remarkable when a large number of the molded products are piled up, and in order to improve the design accuracy as a shock absorber, the yield strength is kept constant even when the molded bodies are stacked. It needs to be improved so that it can be done.

The present invention has been made by paying attention to the above problems, and its purpose is to have a light weight and simple structure, have a large energy absorption efficiency as compared with a reaction force, and have a high resilience. It has excellent rust resistance, water resistance and weather resistance that can be used in the air or in the sea, and is maintenance-free. Furthermore, it can be expanded and assembled if necessary and has a large area. In addition to the characteristic that it can exhibit a uniform cushioning property, by increasing the rigidity in the direction perpendicular to the compression axis, lateral deformation (escape) of the molded product during compression is suppressed, and the molded product has multiple stages. It is an object of the present invention to provide a shock absorber that is improved so that the same yield strength as that of a single-layer product can be obtained even when piled up, and that can be easily attached to a structure.

[0007]

The structure of the shock absorber according to the present invention, which has been able to solve the above-mentioned problems, has an arch-shaped, dome-shaped, or honeycomb-shaped compression deformation portion on a flat plate with or without holes. A plurality of upright resin moldings (A) having a cushioning property having an apparent longitudinal elastic modulus at compression of 2 kg / cm ² or more and 50 kg / cm ² or less and a compression stroke of 50% or more, and bending elasticity. Rate is 50,000kg / cm ²
The gist is that the flexible plate (B) described above is appropriately combined and integrated. This shock absorber has a shock absorbing effect by incorporating a resin molding (A) having a non-linear compression characteristic having a clear yield point within a compression ratio of 15% when compressed in the longitudinal direction. Can be further improved.

[0008]

The shock absorber of the present invention has the three-dimensional shape as described above.
A combination of a resin molded body (A) having an apparent longitudinal elastic modulus at compression and a cushioning property with a specified compression stroke and a flexible plate (B) with a specified bending elastic modulus, which are combined as appropriate. In addition, while maintaining the characteristics of the resin molded body (A), its drawback, that is, the lateral escape at the time of compression is suppressed by the flexible plate (B), and the shock absorption performance is further enhanced. Is.

The resin molding (A) used here is
As described above, a plurality of arch-shaped, dome-shaped or honeycomb-shaped compression deformation portions are erected on an effective or non-perforated flat plate, and have a structure as shown in FIGS. 1 to 5, for example.

That is, FIGS. 1 to 3 exemplify the structure of a spring element constituting the resin molded body (A), and an arch-shaped or dome-shaped compressible deformable portion 1 on a flat plate 3 with or without holes. Is formed, and a large number of spring elements having such a structure are arranged in the vertical and horizontal directions, for example, as shown in FIG. 4 (partial side view).
The resin molded body (A) is formed by adopting an integrally molded shape and structure as shown in FIG. The flat plate 3 and the compressible deformable portion 1 of these spring elements are provided with a parallel portion 2 or a through hole 4 at the top of the compressive deformable portion 1 if necessary, and a flexible plate (B) described later is provided. It is preferable to facilitate the superimposing and integration with.

In the spring element as shown, the flat plate constitutes the impact force receiving surface, while the compressible deformable portion 1 constitutes the elastic deformable portion for absorbing or absorbing the impact force. The deformable portion 1 is not limited in its shape as long as it has a leg portion or a wall that is erected in an oblique direction with respect to the flat plate 3, and various shapes including an arc shape, a trapezoid shape, etc. as shown in the drawing. It can be formed into an arch shape or a dome shape having the same shape and structure. Furthermore, the compressible deformable portion 1
It is also possible to form the honeycomb into a honeycomb shape as shown in FIG. 5 to have a shock absorbing action.

The type of resin constituting the above resin molded article (A) is not particularly limited, but preferred are thermoplastic polyester elastomers, polyolefin elastomers, polyamide elastomers and polyurethane elastomers, or their blends and cast polyurethanes. Examples of such curable resins are: Of these, particularly preferable are thermoplastic polyester elastomers and polyolefin elastomers having excellent weather resistance and water resistance. In selecting these resins, the type is not limited at all, as long as the flexural modulus falls within the above-specified range in order to further enhance the impact relaxation effect and enhance the resilience upon unloading.

As the resin molding (A), one having an apparent longitudinal elastic modulus of 2 kg / cm ² or more and 50 kg / cm ² or less and a compression stroke of 50% or more must be used. If the apparent longitudinal elastic modulus of is less than 2 kg / cm2, the spring constant is small, so the wall thickness of the constituent elements must be increased in order to have a large energy absorption performance, resulting in a heavy and large structure. This is contrary to the spirit of the present invention. On the other hand, when the apparent longitudinal elastic modulus during compression exceeds 50 kg / cm ² , in an extreme case, the molded product becomes rigid and lacks flexibility, and not only is stress concentration caused, it becomes easy to break. , Repeatability becomes worse. Further, since the difference in rigidity between the flexible plate (B) and the flexible plate (B) becomes small, the stress at the time of increasing the compressibility also increases, and as a result, the flexible plate (B) deforms,
The effect of the present invention is impaired. In addition, if the thickness of the component is thin and small, the flexibility of the molded product improves, but when the deformation rate becomes large, the component locally breaks like a paper and permanently deforms. Without doing so, the purpose of the present invention is lost.

The resin molded body (A) is a main element of shock absorption. To enhance the shock absorption effect,
In the relationship between the stress (compressive force / pressure receiving area) when the compressive force is applied from the vertical direction and the compressibility, for example, as shown in FIG. It is preferable that the physical properties are such that the value does not change so much.
Those having a clear yield point within% are preferable.

The resin molding (A) used in the present invention
The preferred constituent materials and physical properties of are as described above,
Other compounding agents, such as various stabilizers such as antioxidants and UV absorbers, dyes / pigments, carbon black, fillers such as talc and glass beads, metal fibers, glass fibers and carbon fibers depending on the use and purpose. Fibrous reinforcing agents, such as
It is also possible to add additives such as antistatic agents, plasticizers, flame retardants, foaming agents, release agents and the like.

There is no limitation on the molding method, and it is also possible to form the arch-shaped portion or the dome-shaped portion by injection molding, compression molding, or secondary molding from a cast-molded plate.

Next, in the flexible plate (B), when the resin molded body (A) receives a compressive force (impact force), the spring element collapses in the lateral direction, and the apparent spring constant in the compressive direction decreases. It has a function to reinforce, and in order to effectively exert such a reinforcing effect, the bending elastic modulus is 50000 kg.
You must use what is / cm ² or more.

The flexible plate (B) having such a high elastic modulus is superposed on and integrated with the resin molding (A) to form the resin molding (A) even when the compression ratio is increased. Lateral escape of constituent spring elements (sideways)
Is prevented, the deformed state as a whole is made uniform, and the restoring force is also enhanced, resulting in an excellent impact absorbing ability.

The constituent material of the flexible plate (B) is not particularly limited, and a metal plate such as aluminum or a synthetic resin plate, F
RP plates can be used, but the above-mentioned reinforcing effects and water resistance
The most general is F considering the corrosion resistance and formability.
It is an RP plate. If necessary, the flexible plate (B) may be provided with reinforcing ribs for increasing rigidity, holes for reducing weight, and the like.

The resin molded body (A) and the flexible plate (B) are laminated in a plurality of sets as shown in FIG. 8 in consideration of the degree of shock absorption required depending on the place of application. It is made into a shock absorber by integrating them.
At this time, as an unifying means, a joining unifying method using an adhesive, a fusion unifying method, a method of joining and unifying vertically or vertically / horizontally with a metal rivet or a plastic rivet, and further, a bolt / nut Although it is possible to adopt a method of joining and integrating using such as, etc., the simplest method is to provide the molded body (A) and plate (B) with connecting holes, fitting parts, self-snap irregularities, etc.・ It is a method that can be expanded and integrated by assembling in the lateral and height directions.

Further, the combination of the resin forming body (A) having the cushioning property and the flexible plate (B) having high rigidity in the present invention may be the combination of BAAB as shown in FIG. 8 and BAABAABAAB. B is regularly sandwiched between A, and further BAABAAABAAB, BAA
Any combination is possible, such as AAAB, AABAAABAA, BAAABAAAB.

The shock absorber according to the present invention is made uniform by combining the resin molding (A) having the cushioning property and the flexible plate (B) as described above and integrating them, so that the deformation is uniform and stable. Not only does it exert a shock absorbing effect, but also distorted deformation is prevented, so that the restoring property after unloading is improved. Further, when only the resin molded body (A) is expanded, its rigidity is low, so that the bending due to its own weight cannot be ignored, and especially when the cantilever type is assembled to the structure, the moment due to its own weight causes warping. However, by integrating with the flexible plate (B) having a high rigidity, such disadvantages are eliminated, and the assembling property to the structure and the suspending property are improved. You can also enjoy the features. Thus, it has good impact energy absorption efficiency, excellent resilience, can be used in the air and at sea, and can be rustproof,
It has become possible to provide a maintenance-free shock absorber having excellent water resistance and weather resistance.

The use of the shock absorber according to the present invention is not particularly limited, but specific uses include, for example, a cushioning material for road side walls and quay side walls, a cushion material which is uniform over a wide area such as a cushion floor of a building. It is useful as

[0024]

EXAMPLES Hereinafter, the impact absorber of the present invention will be described in more detail with reference to examples and comparative examples. Example 1 Using a polyester elastomer "Perprene P-280B" (black color) manufactured by Toyobo Co., Ltd., a resin molded body (A) in which eight arch-shaped spring elements were erected on a flat plate as shown in FIG. 21 cm × 21 cm × height 3.3 cm was injection molded. The molded body (A) is joined with resin rivets in the vertical and horizontal directions, and they are back-to-back, and integrated with the resin rivet. The flexible plate (B) made of FRP is overlaid and assembled with the resin rivet. The shock absorber 4 as shown in FIG. 8 is formed by stacking the attached one layer and further stacking it in three layers.
1 cm × 41 cm × 21 cm was prepared.

Comparative Example 1 Molded articles (A) of the same size obtained in the same manner as in the above Example were joined by resin rivets in the longitudinal and transverse directions, and they were back-to-back and further integrated by resin rivets to form a layer. This was laminated as it was in three layers without using the flexible plate (B) to obtain a shock absorber.

Reference Example 1 The molded body (A) obtained in the same manner as above was joined in the longitudinal and lateral directions with resin rivets, and they were back-to-back, and further integrated with resin rivets to form a further shock absorber. Table 1 shows the performance test results of the obtained absorbers.

[0027]

[Table 1]

As is clear from Table 1, the impact absorber of the present invention can obtain a yield strength closer to that of a single layer product even when the molded products are stacked in multiple stages. Also, the use of the lowermost flexible plate (B) facilitated the attachment to the foundation. Moreover, it can be used in the air or in the sea without any problems, has excellent rust prevention, water resistance, and weather resistance, and is maintenance-free.

[0029]

EFFECTS OF THE INVENTION The present invention is configured as described above, has a high impact energy absorption efficiency, an excellent restoration property, can be used in the air and at sea, and has excellent rust prevention, water resistance, weather resistance, and maintenance-free impact absorption. It was able to provide the body.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a spring element in a resin molded body (A) used in the present invention.

FIG. 2 is a perspective view illustrating a spring element in a resin molded body (A) used in the present invention.

FIG. 3 is a perspective view illustrating a spring element in a resin molded body (A) used in the present invention.

FIG. 4 is a sketch drawing illustrating a resin molding (A) used in the present invention.

FIG. 5 is a perspective view showing another example of the spring element in the resin molded body (A) used in the present invention.

FIG. 6 is a graph showing the relationship between stress and compressibility.

FIG. 7 is a sketch drawing illustrating a resin molding (A) used in the present invention.

FIG. 8 is a side view illustrating a shock absorber of the present invention.

[Explanation of symbols]

 1 Compressible Deformable Part 2 Parallel Part 3 Flat Plate 4 Through Hole 5 Flexible Plate

Claims (2)

[Claims] 1. An arch shape on a flat plate with or without holes,
It has a cushioning property in which a plurality of dome-shaped or honeycomb-shaped compression deformation parts are erected, and the apparent longitudinal elastic modulus at compression is 2 kg / cm ² or more and 50 kg / cm ² or less and the compression stroke is 50% or more. A shock absorber comprising a resin molded body (A) and a flexible plate (B) having a flexural modulus of 50000 kg / cm ² or more, which are appropriately combined and integrated. 2. A compression ratio of 15 when compressed in the vertical direction.
The shock absorber according to claim 1, which has a non-linear compression characteristic having a clear yield point within%.