JPH11170935A - Structural member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structural member which can attain reduction in weight and manufacturing cost with forming material used effectively by forming such a cross-sectional shape that can maximize strength without increasing the capacity (weight) of the forming material when a hollow member with one or more of corner parts is used as the reinforcing member of an automotive bumper or the structural member of a general structure. SOLUTION: This structural member is formed so as to obtain the following: (1) a hollow member with one or more of corner parts, and at least one of the corner parts 10a to 10d is formed to have a large wall thickness. (2) One or more of reinforcing ribs formed with a vacancy is formed between the side parts 2a at a hollow part, which face stress direction applied to the hollow member. (3) A cross type reinforcing rib formed with the vacancy is formed at the hollow part. (4) A combination of (1) and (2). (5) A combination of (1) and (3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural member used for a shock absorber (hereinafter referred to as a "bumper") or a vehicle body of various vehicles to ensure safety and reduce damage to the vehicle body. Or a structural member used in a general structure.

[0002]

2. Description of the Related Art For example, a bumper used in an automobile generally includes an outer shell 1, a reinforcing member 2 for reinforcing the outer shell 1, and an outer shell 1 as shown in FIG. And a cushioning member 3 interposed between the reinforcing member 2 and the cushioning member 3 are known. (Reference technology JP-A-7-
76251, the technology described in JP-A-8-80789, and others)

In this bumper, the outer shell 1 and the reinforcing member 2 have attachment portions 5 and 6 to a vehicle body (frame) 4, respectively, as shown in FIG.
The outer shell 1 and the reinforcing member 2 are interposed between the outer shell 1 and the reinforcing member 2 with
By attaching it to the front end (rear end) of the vehicle, it functions as a bumper.

In such a bumper, for example,
The impact force due to the collision is transmitted from the outer shell 1 of the bumper to the vehicle body frame 4 via the cushioning member 3 and the reinforcing member 2, and in the process, the shock is reduced by the deformation of the outer shell 2, the cushioning member 3 and the reinforcing member 2. Is done. For example, in the case of the above-described bumper, the reinforcing member 2 has a square cross-sectional shape,
A cross section in which the front plate 2a and the rear plate 2b are connected by, for example, a reinforcing rib 9 is of a Japanese type or an eye type.
However, since this reinforcing member receives a large impact force,
It is mainly made of a steel material whose strength is easily ensured, and its production involves operations such as rolling, cutting, bending and welding, so that there is a high demand for reduction in production costs.

On the other hand, in recent years, in various automobiles, there has been an increasing demand for weight reduction from the viewpoint of reducing fuel consumption and reducing the scale of accidents, and the cross-sectional shape of this reinforcing member maximizes the strength of the material used. In terms of whether it is the most suitable one that can fulfill the demand for lighter weight, it has not always been confirmed that it can be sufficiently evaluated. It is also known to use an aluminum material for the reinforcing member in order to reduce the weight, but it has been confirmed that the aluminum alloy has an optimum cross-sectional shape that secures sufficient strength with a small capacity (weight). Not.

[0006]

SUMMARY OF THE INVENTION The present invention provides a reinforcing member for a bumper of an automobile, for example, by adopting a cross-sectional shape capable of maximizing strength without increasing the capacity (weight) of a forming material. A structure that makes it possible to reduce the weight of the bumper by efficiently using the forming material, and to reduce the production cost by lowering the primary cost by casting or extrusion and searching for a cross-sectional structure that is easy to process. A member is provided.

[0007]

SUMMARY OF THE INVENTION The present invention has the following features. (1) A structural member which is a hollow member having one or more corners, wherein at least one corner is formed to be thick. (2) A hollow member having one or more corners, wherein one or more reinforcing ribs having holes are provided between the side portions of the hollow portion facing in the direction of stress applied to the hollow member. And structural members. (3) A hollow member having one or more corners, wherein a cross-shaped reinforcing rib having one or more crossing portions in which holes are formed,
A structural member provided in a hollow portion. (4) A hollow member having one or more corners, wherein at least one corner is formed to be thick, and a hole is formed between the side portions of the hollow portion facing the stress direction applied to the hollow member. A structural member provided with one or more reinforcing ribs. (5) A hollow member having one or more corners, wherein at least one corner is formed to be thick, and a cross-type reinforcing rib having at least one crossing part having a hole is provided in the hollow part. A structural member characterized in that: (6) The structural member according to any one of (1) to (5), wherein the structural member is formed of aluminum or an aluminum alloy.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is characterized in that a hollow structural member having one or more corners has a cross-sectional shape which can maximize strength without increasing the capacity (weight) of a forming material. doing. The hollow structural material having a corner (including a corner formed in a curved surface and hereinafter referred to as a “corner”) in the present invention is, for example, a reinforcing member used for a bumper of an automobile shown in FIG. , A structural member used in a vehicle body or a general structure (hereinafter, referred to as a “structural member”), for example, a member having four or more corners such as a hollow member having a rectangular, trapezoidal, or polygonal cross section; A typical example is a member having three corners such as a triangular hollow member, or a structural member having two corners such as a hollow member having a semicircular cross section.

As a material for forming the structural member (including the reinforcing ribs) of the present invention, a steel material is generally used, and the manufacturing method includes operations such as rolling, cutting, bending, drilling, welding, and fitting. When employing the accompanying manufacturing method, there is a disadvantage in terms of manufacturing cost. Therefore, it is more preferable to adopt a manufacturing method by casting, extrusion, or the like in which a structural member having a reinforcing portion having a predetermined shape is integrally obtained. Further, in the case of steel, since the specific gravity is large, it may not be possible to sufficiently meet the demand for weight reduction. Therefore, it is easy to reduce the weight, and an integrated part having a reinforcing portion of a predetermined shape by casting or extrusion molding is used. In some cases, a lightweight material such as a light metal material such as aluminum or an alloy thereof or a synthetic resin material, for example, can be easily obtained.

[0010] The present inventors have confirmed that in a hollow structural member having the above-mentioned corners, when a load is applied from the side, stress concentrates on the corners and crushing (bending) starts from the corners. Then, the inventors conceived of maximizing the strength without increasing the capacity (weight) of the forming material by dispersing and relaxing the stress concentration at the corners, and reached the following inventions through experiments. .

In the first invention, at least one corner of the hollow member is formed thicker than other portions to reinforce the crushing (bending) strength. When thickening the corners, gradually increase the thickness so as not to cause a large thickness step at the boundary between the corners and other parts, and reduce the stress concentration on the inner surface at the apex of the corner. It is preferable to form it on a curved surface. For example, in the case of a square cross section, there are four corners, but it is not an absolute condition to form all four corners thick, but even if a load is applied from any direction, This is a preferable condition because a stable strength can be secured by dispersing the stress concentration at the corners.

The corner to be thickened is selected in consideration of the material, the cross-sectional shape, the degree of stress and the acting direction, the stress acting position, the set strength, and the like. And the wall thickness distribution other than the corners are determined. The effect of making the corner thicker is that, for example, when the cross-sectional shape of the structural member is a mouth shape, without increasing the weight (capacity),
When the thickness a of the corner at two places is made twice as large as the thickness of the other part (side), a maximum of 20 times is obtained as compared with the case where the thickness is made equal.
The crushing (bending) strength can be increased to about 0%.

Further, in the second invention, one or more reinforcing ribs having holes are provided between the side portions of the hollow portion facing in the direction of the stress applied to the hollow portion, and the stress is distributed to the reinforcing ribs. Alleviates the stress concentrated on the corners of In the case where the reinforcing rib is applied as a reinforcing member of a bumper, for example, it is more preferable that the cross-sectional shape of the reinforcing rib be such that the thickness increases on the fixed side to the vehicle body. In addition, the reinforcing ribs are formed with holes that are pushed open so that the weight (capacity) can be minimized, and the energy absorption capacity of the reinforcing ribs is smaller than that of the conventional reinforcing rib having a simple shape. Can be increased. The shape of the hole and the position at which the hole is formed are determined according to the material, the cross-sectional shape, the degree of the stress, the acting direction, the stress acting position, the set strength, and the like. The shape of the holes is usually a perfect circle or an ellipse, but may be another shape.

Although one or more reinforcing ribs are provided, the cross-sectional shape of the structural member may not always be symmetrical in the left-right (up / down) direction. Absent. For example, when the cross-sectional shape of the structural member is a mouth shape, when arranging one reinforcing rib, in the middle part of the main body, and when arranging two reinforcing ribs, arranging them symmetrically is an absolute condition. However, it is a preferable condition for securing stable strength. This reinforcing rib is made of material, cross-sectional shape and degree of stress,
The shape, the number of rows, the arrangement, the direction (inclination), and the like are determined in consideration of the stress acting position, the set strength, and the like.

The effect of arranging the reinforcing ribs is that, for example, when the reinforcing member main body has a mouth-shaped cross-section, if the reinforcing ribs are arranged in one line in the intermediate portion within a range where the weight (capacity) is not increased, the reinforcing ribs are provided. 120 compared to the case without
%, The crushing (bending) strength can be increased.
In addition, when two reinforcing ribs are arranged at equal intervals in the middle portion within a range where weight (capacity) is not increased, the crushing (bending) strength is increased to about 170% as compared with a case where no rib is provided. Can be. In addition, when compared with the case where the conventional rib in which the reinforcing rib does not have a hole is arranged, 10 to 10
The crushing (bending) strength can be increased by about 20%.

According to a third aspect of the present invention, there is provided an intersecting reinforcing rib having one or more intersecting portions (mainly an intersecting portion such as a cross, an X-shape, a Y-shape, etc.) having holes (hereinafter referred to as an "intersecting-type reinforcing rib") Is provided in the hollow portion, and the stress is dispersed by the intersecting reinforcing ribs, and the stress concentrated at the corner of the hollow member is reduced. When using the cross-type reinforcing ribs, it is preferable that the holes are provided at the crossing points where stress tends to concentrate. In the third invention, a reinforcing rib having a form different from that of the reinforcing rib of the second invention is provided, but substantially the same reinforcing rib effect as that of the second invention can be obtained.

According to a fourth aspect of the present invention, at least one corner of the hollow member is formed to be thick, and one or more reinforcing ribs having holes are provided between the side portions of the hollow portion facing the stress direction applied to the hollow member. Thereby, the corner-thickening effect of the first invention and the reinforcing rib effect of the second invention simultaneously act. For example,
In the case where the cross-sectional shape of the structural member is a mouth shape, the four corners are made thicker and the reinforcing ribs are arranged in the middle part in a range where the weight (capacity) is not increased, and the reinforcing ribs are not provided. The crushing (bending) strength can be increased to about 190% in comparison. Also, when two reinforcing ribs are arranged at equal intervals in the middle part within a range where the weight (capacity) is not increased, the crushing (bending) strength is reduced to about 120% as compared with the case where one reinforcing rib is arranged. Can be enhanced.

According to a fifth aspect of the present invention, at least one corner of the hollow member is formed to be thick, and a cross-type reinforcing rib having holes at one or more crossing portions is provided in the hollow portion. At the same time, and the reinforcing rib effect of the third aspect of the present invention is simultaneously applied.

According to a sixth aspect of the present invention, the structural member according to the first to fifth aspects is formed using a lightweight metal material such as aluminum in order to make it easier to reduce the weight and the manufacturing cost.

In the first to fifth inventions, particularly the second to fifth inventions having reinforcing ribs, when the structural member is formed of steel, the strength can be increased. As described above, since the specific gravity is large, there is a case where the demand for weight reduction cannot be sufficiently satisfied. Therefore, the weight reduction is easy, and an integrated structure having a reinforcing portion of a predetermined shape by casting or extrusion molding or the like. By using a lightweight material such as a light metal material such as aluminum or an alloy thereof or a synthetic resin material from which a member can be easily obtained, it is possible to sufficiently meet the demand for weight reduction. For example, when a lightweight metal material such as aluminum is used, it is necessary to increase the wall thickness in order to secure strength as compared with the case where a steel material is used. Can be significantly increased, and the manufacturing cost can be reduced.

Hereinafter, the structural member of the present invention will be described with a displacement of 3
A case where the present invention is applied as a reinforcing member of a front bumper of a large passenger car of a 000 cc class will be described as a representative example. Figure 1
FIG. 2 shows an example of the structure of the reinforcing member of the bumper according to the first invention in which the corners are formed thick.

In this example, as shown in FIG. 1 (a), the bumper has an outer shell 1 formed by pressing a steel plate, a reinforcing member 2 according to the present invention, and a space between the outer shell 1 and the reinforcing member 2. This bumper is composed of a buffer material 3 interposed therebetween. In this bumper, a mounting portion 5 at the upper end of the outer shell 1 and a mounting portion 6 of the reinforcing member 2 are mounted on a vehicle body (frame) 4 by bolt nuts 7 and 8, respectively. Is fixed. For example, when a collision occurs, the load W due to the impact is transmitted from the outer shell 1 to the vehicle body (frame) 4 via the cushioning member 3 and the reinforcing member 2. The shock is buffered by the deformation of the member 2.

Here, the reinforcing member 2 is formed integrally by casting aluminum. As shown in FIG. 1 (b), the cross section is rectangular and has four corners 10a to 10d. This is a hollow corner member having both ends opened, in which the thicknesses a and b of the portion are larger than the thickness c of the other portions.

Examples of other cross-sectional shapes in which the corners of the reinforcing member 2 are thickened include, for example, those shown in FIGS. 2 (a) to 2 (i). FIG. 2 (i) shows an example in which a hole p is formed in a corner. In these cross-sectional examples, the outside of the corner is formed at a right angle, but some are not at a right angle, and the other is a curved surface formed at the outside of the corner.

In the bumper reinforcing member according to the first aspect of the present invention, four corners are formed to be thick, and the crushing (bending) strength is reinforced at these corners so that the deformation due to the load W can be reduced. I have.

FIGS. 3 and 4 show a structural example of a bumper reinforcing member according to the second invention in which a reinforcing rib is provided in a hollow portion. Here, the reinforcing member 2 is formed integrally by casting aluminum. As shown in FIG. 3B, the cross section is rectangular and has four corners 10a to 10d. Two reinforcing ribs 1 in the longitudinal direction between the portions 2b.
It is a hollow corner member formed by continuously forming 1a and 11b and having both ends opened. The reinforcing ribs 11a and 11b are formed with elliptical holes 12 penetrating in the longitudinal direction of the reinforcing member in the middle portion thereof, thereby increasing the energy absorbing ability and reducing the weight.

Examples of the cross-sectional shape of the reinforcing member include, for example,
4A to 4L. FIG.
(D) and (i) are elliptical holes 12 and irregular holes 12.
The figure shows a double hole formed by d. In these cross-sectional examples, the corners are formed at right angles, but are not limited to right angles, and the corners may be formed as curved surfaces. Further, in these cross-sectional examples, two reinforcing ribs 11a and 11b are provided, but the number of reinforcing ribs may be one.

The bumper reinforcing member 2 according to the second invention
In this embodiment, two reinforcing ribs 11 are formed between the side portions 2a and the side portions 2b in the direction in which the stress is applied.
The a and 11b are formed continuously, and the stress caused by the load W is dispersed by the reinforcing ribs so that crushing (bending) does not easily occur at the corners and deformation can be reduced.

FIGS. 5 and 6 show an example of the structure of a reinforcing member of a bumper according to the third invention in which cross-shaped reinforcing ribs having holes are formed in hollow portions. The reinforcing member 2
Here, aluminum is integrally formed by casting, and as shown in FIG. 5B, the cross section is rectangular and has four corners 10a to 10d, and intersects the hollow in the length direction thereof. It is a hollow square member having both ends opened and formed by continuously forming a mold reinforcing rib 11c. This cross-shaped reinforcing rib 11c
Is formed with a circular hole 12c in the center thereof penetrating in the length direction of the reinforcing member, thereby increasing the energy absorption capacity and reducing the weight.

Examples of the cross-sectional shape of the reinforcing member include, for example,
FIGS. 6A to 6E show examples. FIG.
6B shows a case where the holes 12c are also formed at the corners, and FIG. 6E shows a case where the holes 12c are also formed at the intersections between the side portions and the reinforcing ribs. In these cross-sectional examples, the corners are formed at a right angle. However, the shape is not limited to the right angle, and the corners may be formed at a curved surface.

In the reinforcing member 2 of the bumper according to the third aspect of the present invention, the stress is distributed to the cross-shaped reinforcing ribs 12c so that crushing (bending) is less likely to occur at the corners and deformation can be reduced. ing.

FIGS. 7 and 8 show an example of the structure of a reinforcing member of a bumper according to the fourth invention in which a corner is formed thick and a reinforcing rib having a hole is provided in a hollow portion. . Here, the reinforcing member 2 is integrally formed by casting aluminum, and has a rectangular cross section having four corners 10a to 10d, as shown in FIG. Is made larger than the thickness c of the other portion, and two reinforcing ribs 11a and 11b are continuously formed in the length direction between the side portion 2a and the side portion 2b in a direction to which an external stress is applied. Is an open hollow corner member. The reinforcing ribs 11a, 1
1b is formed with an elliptical hole 12 penetrating in the longitudinal direction of the reinforcing member in the middle part thereof, thereby increasing the energy absorption capacity and reducing the weight.

Examples of the cross-sectional shape of the reinforcing member 2 include, for example, those shown in FIGS. 8 (a) to 8 (e). FIGS. 8 (d) and 8 (e) show double holes formed in the hollow portion by elliptical holes 12 and irregular holes 12d. In these cross-sectional examples, the outside of the corner is formed at a right angle. However, the shape is not limited to the right angle, and the outside of the corner may be formed as a curved surface. In these cross-sectional examples, two reinforcing ribs 11a and 11b are arranged.
The reinforcing ribs may be formed as one.

In the bumper reinforcing member according to the fourth aspect of the present invention, the four corners are formed thick, and the side portions 2a and 2
b, two reinforcing ribs 1 having a hole 12 in the middle
1a and 11b are provided, and the corners are reinforced, and the stress due to the load W is dispersed by the reinforcing ribs, so that crushing (bending) is less likely to occur at the corners and deformation can be reduced. .

FIGS. 9 and 10 show a structural example of a reinforcing member of a bumper according to the fifth invention in which a corner portion is formed thick and a cross-shaped reinforcing rib having a hole is formed in a hollow portion. Things. In this case, the reinforcing member 2 is integrally formed by casting aluminum. As shown in FIG. 9B, the cross section is rectangular and has four corners 10a to 10d. Is a hollow corner member having both ends opened, wherein a cross-shaped reinforcing rib 11c is continuously formed in the length direction on the hollow portion side on the side of the hollow portion. The cross-shaped reinforcing rib 11c has a circular hole 12c formed in the center of the reinforcing rib 11c so as to penetrate in the longitudinal direction of the reinforcing member, thereby increasing the energy absorbing capacity and reducing the weight.

Examples of the cross-sectional shape of the cross-shaped reinforcing member include:
For example, there are those as shown in FIGS. FIG. 10 (b) shows a case where a hole 12o is also formed at the corner, and FIG.
0 (e) shows that the holes 12c are also formed at the intersections of the side portions and the reinforcing ribs.

In these cross-sectional examples, the corners are formed at right angles, but the invention is not limited to right angles, and the corners may be formed as curved surfaces.

In the bumper reinforcing member according to the fifth aspect of the present invention, four corners are formed to be thick, and a cross-shaped reinforcing rib 11c is disposed on the hollow side to reinforce these corners. By dispersing the stress caused by the load W by the reinforcing ribs, crushing (bending) is less likely to occur at corners, and deformation can be reduced.

It should be noted that the structural member of the present invention is not applied only as a reinforcing member for a bumper as in the above-described example, but is used in various types of vehicles to ensure human safety and reduce vehicle body damage. It is also applicable as a structural member for use in a general structure or as a structural member for other general structures, and is not limited to a structural member having four corners.

The size, mounting structure, manufacturing method, etc.
Modifications may be made within the range that satisfies the claims according to the application target, scale, required weight, strength, and the like. For example, in the above example, the reinforcing member is integrally formed by casting with aluminum to further reduce the weight, and to realize a significant reduction in manufacturing cost. However, a lightweight metal material other than aluminum or a synthetic resin material may be used. Alternatively, a steel material or a stainless steel material may be used.

Therefore, the production method is not limited to casting, but may be extrusion molding, molding, welding, or the like. When the reinforcing rib is formed, it is not essential that the main body of the structural member and the reinforcing rib are integrally formed. For example, the reinforcing rib may be manufactured separately from the main body and fitted into the main body. . It is not essential that the main body and the reinforcing rib are formed of the same material.

[0042]

(Example 1) A comparison made of a rectangular square cross-section having a thickness of 2 mm, a length of a long side of 90 mm, a length of a short side of 45 mm, and a length of 2 m, obtained by extrusion molding aluminum. A structural member according to the present invention having the same weight as the structural member of the example, having a thickness of 1.3 mm, and thickening the four corners as shown in FIG. 1 (b) was prepared. A load W was applied to the center of the midpoint in the length direction from the direction of the arrow, and a crushing (bending) test was performed to compare the strength. As a result, the crushing strength of the structural member of the present invention was 4.8 kgf, the structural member of the comparative example was 2.3 kgf, and the bending rigidity of the structural member of the present invention was about twice that of the structural member of the comparative example (1/1). (2 is lighter)
Was realized.

(Example 2) A hollow square member having a rectangular cross section having a thickness of 2 mm, a length of a long side of 90 mm, a length of a short side of 45 mm, and a length of 2 m, which was obtained by extrusion molding of aluminum. The weight is the same as that of the structural member of the comparative example in which conventional simple-shaped ribs having a thickness of 2 mm are arranged at two equal intervals, and the thickness is 1.9 mm, and the hollow is formed as shown in FIG. A structural member according to the present invention in which reinforcing ribs having holes with a diameter of 1.0 mm are arranged in the middle part on the side of the part is prepared.
And a crushing (bending) test was performed to compare the strength. As a result, the crushing strength of the structural member of the present invention was 9.8 kg.
f, the structural member of the comparative example is 8.0 kgf, and the structural member of the present invention has a flexural rigidity (4 /
5). The structural member of the present invention was able to realize a strength (weight reduced to 4/5) about 1.2 times that of the structural member of the comparative example.

[0044]

According to the present invention, a hollow structural member having a cross section having one or more corners is formed by changing the capacity (weight) of the material for forming the hollow structural member.
By increasing the cross-sectional shape so as to maximize the strength without increasing the strength, the crushing (bending) strength of the structural member can be reinforced, and the weight of the structural member can be reduced by using the forming material efficiently. be able to. In addition, by forming this structural member from a lightweight metal material such as aluminum, the weight can be further reduced, and the manufacturing cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1A is a side sectional explanatory view showing a structural example of a vehicle bumper using a structural member according to the present invention as a reinforcing member, and FIG. 1B is a part of the reinforcing member in FIG. FIG.

FIG. 2 is an explanatory side sectional view schematically showing another example of a sectional shape of the reinforcing member in FIG. 1;

FIG. 3 (a) is a side sectional explanatory view showing another structural example of an automobile bumper using the structural member according to the present invention as a reinforcing member, and FIG. 3 (b) is a diagram of the reinforcing member in FIG. FIG.

FIG. 4 is an explanatory side sectional view schematically showing another example of a sectional shape of the reinforcing member in FIG. 3;

FIG. 5 (a) is a side sectional view showing another example of the structure of a vehicle bumper using the structural member according to the present invention as a reinforcing member, and FIG. 5 (b) is another reinforcement in FIG. FIG.

FIG. 6 is an explanatory side sectional view schematically showing another example of a sectional shape of the reinforcing member in FIG. 5;

FIG. 7 (a) is a side sectional explanatory view showing another structural example of an automobile bumper using the structural member according to the present invention as a reinforcing member, and FIG. 7 (b) is a side view of the reinforcing member in FIG. FIG.

FIG. 8 is an explanatory side sectional view schematically showing another example of a sectional shape of the reinforcing member of the present invention in FIG. 7;

FIG. 9 (a) is a side sectional explanatory view showing another structural example of an automobile bumper using the structural member according to the present invention as a reinforcing material, and FIG. 9 (b) is a diagram of the reinforcing member in FIG. FIG.

FIG. 10 is an explanatory side sectional view schematically showing another example of a sectional shape of the reinforcing member in FIG. 9;

FIG. 11A is a three-dimensional explanatory view showing general components of a conventional automobile bumper. FIG. 2B is an explanatory side sectional view showing a general structure example of a conventional automobile bumper formed by the components shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer shell 2 Reinforcement member 2a Side part 3 Shock absorber 4 Car body 5, 6 Attachment part 7, 8 Bolt / nut 9 Rib 10a-10d Corner 11a, 11b Reinforcement rib 11c Cross-type reinforcement rib 12, 12c, 12o, p Hole 12d Variant hole

Claims (6)

[Claims] 1. A structural member comprising a hollow member having one or more corners, wherein at least one corner is formed to be thick. 2. A hollow member having one or more corners, wherein one or more reinforcing ribs having holes are provided between the side portions of the hollow portion facing in the direction of stress applied to the hollow member. A structural member characterized by the above-mentioned. 3. A structural member comprising a hollow member having one or more corners, wherein a cross-shaped reinforcing rib having at least one crossing portion having a hole is provided in the hollow portion. 4. A hollow member having at least one corner portion, wherein at least one corner portion is formed to be thick, and a hole is formed between side portions of the hollow portion facing a stress direction applied to the hollow member. A structural member characterized in that one or more reinforcing ribs formed with are provided. 5. A hollow member having one or more corners, wherein at least one corner is formed to be thick, and a cross-shaped reinforcing rib having at least one crossing part having a hole is provided in the hollow part. A structural member provided in the above. 6. The structural member according to claim 1, wherein the structural member is made of aluminum or an aluminum alloy.