JPH0534281Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of the structure of a hollow strength member made of resin that can sufficiently withstand even when a large load such as an impact is applied.

This invention relates to a hollow strength member structure in which a pair of synthetic resin strength members each having a substantially hat-shaped cross section are bonded to each other via an adhesive to form a box-shaped cross section. The convex part of the hat-shaped part on one side of the member is used as the pressure receiving surface of the compressive load,
When the joint surfaces of the opposing opening flanges face the outer end surface, one opening flange is formed into a labyrinth-like surface consisting of a bottomed recess and a protruding engagement portion following it, and the other opening flange is formed in the bottomed recess. This invention relates to a structure of a hollow strength member in which the labyrinth-like surfaces of both strength members are mechanically engaged with each other.

<Conventional technology> In recent years, research and development of new materials has been actively conducted in various fields, and their practical use is also being actively studied.For example, in the automobile manufacturing industry,
Reinforced plastics such as FRP (Fiber Reinforced Plastics) are being used in various parts of car bodies.

Generally, automobile bumpers have an elastic bumper body made of urethane material or the like that is attached to the front and rear ends of the body via reinforcements. FRP resin molded products, which are lightweight and have excellent shock absorption properties, are increasingly being used.

However, FRP resin molded products are adopted for such reinforcements with the aim of reducing weight, and although structures that should be lighter, such as hollow closed cross-section structures, are desired, it is structurally difficult to mold them in one piece. However, it has the disadvantage of high cost, and for this reason, reinforcement with a bonded structure is now often adopted out of necessity.

In addition, when strong members such as bumper parts of these types of automobiles are connected to each other, fasteners such as bolts and nuts, adhesives, etc. are generally used, but resin materials such as FRP molded products are used. The latter type of bonding method using adhesives is often used to bond strength members made of FRP, taking into consideration the good stress distribution when applying large loads, and FRP automobile bumper reinforcements are often used. Alternatively, as shown in FIGS. 4 and 5, the front reinforcement 2 to which the elastic bumper 1 is attached and the rear reinforcement 3 fixed to the body (not shown) are each divided into a hat-shaped cross section. There is a mode in which a structure is adopted in which the facing opening flanges 4 and 5 of the front reinforcement 2 and the rear reinforcement 3 are joined via an adhesive 6.

<Problems to be solved by the invention> However, the hollow strength member structure such as the conventional bumper reinforcement made of multiple members described above relies only on the adhesive strength of the adhesive material for the mutual connection of each member and the state of the connection. Because of this, the strength was not sufficient, and when a large impact load is applied instantaneously such as during a collision in a direction that deforms the cross section of the hollow strength member, and compressive stress is applied, shearing force is generated and the opening flange There is a drawback that there is a possibility that the mutual bonding may be weakened.

Once such a problem occurs, the hollow strength member no longer functions as it should, so it must be replaced with a new one, which has the disadvantage of increasing costs.

In addition, the earlier application No. 84113 (Sho 62-84113)
As disclosed in Japanese Patent Publication No. 195559, there is an embodiment in which the opening flange is engaged with a pin hole, but in such an embodiment, a so-called weld line is formed in the resin around the hole during molding, and the FRP fibers are uniformly dispersed. not,
There is an inconvenience that the strength of the opening flange cannot be obtained sufficiently, and to deal with this, forming the holes in post-processing increases the number of man-hours and has the disadvantage that strength management is complicated and costs increase. There is a problem that the wall thickness around the hole must be increased.

The purpose of this invention is to solve the technical problems of the resin hollow strength members based on the conventional technology mentioned above, and to improve the joint strength of the strength members without adding any new parts, thereby increasing the durability of the strength members. It is an object of the present invention to provide an excellent hollow strength member that improves performance and reliability and is useful in the field of component assembly technology used in various mechanical product manufacturing industries.

<Means for solving the problem> In order to solve the above-mentioned problem, the configuration of this device, which is based on the gist of the claims for the utility model registration set forth above, in accordance with the above-mentioned object, provides a hollow strength member structure in which a pair of resin strength members having a generally hat-shaped cross section have opposing opening flanges joined together via an adhesive, the convex surface of the hat-shaped portion of at least one of the pair of strength members forms a pressure-receiving surface for a compressive load, at least one of the opposing opening flanges is formed toward its outer end with a labyrinth-shaped surface consisting of a bottomed recess and a protruding engagement portion adjacent to the bottomed recess, the other opening flange engages with the bottomed recess of one opening flange, and the labyrinth-shaped surfaces of both opening flanges are mechanically engaged to resist shear stress.

<Function> Thus, the convex portion of the hat-shaped portion of one of the pair of resin strength members formed in a hat-like cross section serves as a pressure receiving surface for the compressive load, and the opening flanges facing each other are connected to the outer ends. A labyrinth-shaped surface is formed on at least one opening flange facing toward the bottom, and the other opening flange is formed into a labyrinth-shaped surface that can be engaged in a corresponding manner. and applying an adhesive to the labyrinth-like surfaces of each of the opening flanges so that the labyrinth-like surfaces of both strength members are bonded together and mechanically engaged with each other to resist shearing forces. The stress applied in the cross-sectional deformation direction can be sufficiently borne by the adhesive force of the adhesive on the labyrinth-shaped surfaces and the engagement support force due to the mechanical engagement of the labyrinth-shaped surfaces with each other. be.

<Example> Next, an example of this invention will be described below based on FIGS. 1 to 3. Incidentally, the same reference numerals are used to describe the same parts as those in the conventional embodiment shown in FIGS. 4 and 5.

In the embodiment shown in FIG. 1, numeral 7 is a bumper reinforcement for an automobile, which represents one aspect of the hollow strength member that forms the central point of this invention.

Therefore, the bumper reinforcement 7 is
It consists of a combination of a front reinforcement 2' and a rear reinforcement 3', which are made of FRP material and have a hat-shaped cross section.The convex part of the hat-shaped part of the front reinforcement 2' is compressed The front reinforcement 2' serves as the pressure receiving surface for the load F.
and opposing opening flanges 4' formed on the outer peripheral edges of each of the rear reinforcements 3',
5' are joined together and integrally engaged with the bumper reinforcement 7 to form a hollow cross section.

The opening flange 4' of the front reinforcement 2' has flange engaging parts 8 and 9 extending horizontally from the inner and outer edges thereof over the entire outer circumferential area thereof. They are each integrally formed into a bottomed recess 41 with a groove-like cross section, into which the flange 5' of the rear reinforcement 3' can be fitted, and the front reinforcement 2' and the rear reinforcement 2' are connected to each other. When the reinforcement 3 is joined, the inner and outer flange 5' end edges of the rear reinforcement 3' are connected to the flange engaging part 8 of the flange 4 of the front reinforcement 2', 9, that is, the opening flanges 4' and 5' of the front reinforcement 2' and the rear reinforcement 3' are mechanically engaged in a labyrinth-like manner. It is designed to handle shear stress.

Further, 10 is a predetermined adhesive such as urethane-based, epoxy-based, acrylic-based, etc., and the adhesive 10 extends from the flange engaging part 8 to the flange engaging part 9 of the flange 4' of the front reinforcement 2'. Filling is inserted between the bottomed recess 41 on the inner surface of the opening flange 4' and the opening flange 5' of the rear reinforcement 3' gripped by the recess 41. The opening flange 5' is mechanically engaged with and gripped by the flange engaging portions 8, 9 of the opening flange 4' of the front reinforcement 2'.

In the above configuration, the front reinforcement 2' and the rear reinforcement 3', which are joined and fixed to each other, are bonded with the adhesive 10, and the flange of the opening flange 4' of the front reinforcement 2' is bonded with the adhesive 10. Since the engaging parts 8 and 9 are mutually supported by mechanical engagement with the opening flange 5' of the rear reinforcement 3', if there is an elastic force (not shown) due to a collision of a car, etc. A large impact load F is applied to the bumper part as a compressive load, and the bumper reinforcement 7 acts as a hollow strength member.
Even if the load F is transmitted to the flange 4' of the front reinforcement 2', the stress distributed in the outer circumferential direction of the opening flange 4' is transmitted to the flange engaging parts 8, 9 of the flange 4' of the front reinforcement 2' The front reinforcement 2' and the rear reinforcement 3' are connected to each other by mechanical engagement by the opening flange 5' of the side reinforcement 3' to resist shear stress. This is absorbed by the elastic deformation of the bumper reinforcement 7 without causing any peeling on the surface.

Furthermore, since the flange engaging portions 8 and 9 of the opening flange 4' of the front reinforcement 2' are integrally formed over the entire area of the opening flange 4', they are resistant to stress in the shearing direction. It is extremely strong in terms of strength, so even if a large compressive load such as during a collision is repeatedly applied, damage is unlikely to occur.

Furthermore, the flange engaging portions 8 and 9 of the opening flange 4' of the front reinforcement 2' and the inner and outer end surfaces of the opening flange 5' of the rear reinforcement 3' are bonded to the adhesive 10. Because they are connected in this way, the compressive stress transmitted in the front-rear direction between the front reinforcement 2' and the rear reinforcement 3' due to vibration shock, etc. is dispersed on the pressure receiving surface of the convex part of the hat-shaped part. The opening flange 4'
As a result, the bumper reinforcement 7 has high strength even against internal stress acting in the front-rear direction. become stronger.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. 2, each opening of the front reinforcement 2'' and the rear reinforcement 3'' Part flange 4″,
Each of the 5" labyrinth forming surfaces may be simply provided with a protruding engaging portion 11 and a corresponding groove-shaped bottomed recess 12, or an opening flange 4 may be provided as shown in FIG.

Claims (1)

[Scope of utility model registration request] In a hollow strength member structure in which a pair of resin strength members each having a substantially hat-shaped cross section are joined to each other via an adhesive at their opposing opening flanges, the hat of at least one of the pair of strength members is The convex surface of the shaped part forms a pressure receiving surface for a compressive load, and at least one of the opposing opening flanges faces toward the outer end, and the labyrinth shape is composed of a bottomed recess and a protruding engagement part adjacent to the bottomed recess. The other opening flange is formed in a surface such that the other opening flange engages with the bottomed recess of one opening flange, and the labyrinth-like surfaces of both opening flanges are mechanically engaged to resist shear stress. A hollow strength member structure characterized by: