JP2021183445A - Vehicle bumper - Google Patents

Abstract

To solve the problem that when a resin material is applied to a conventional vehicle bumper, absorption performance of impact energy is insufficient and there is the risk that fragments scatter.SOLUTION: There is provided a vehicle bumper A, in which a beam extension part E is provided integrally on right and left of a metal bumper beam part B, the bumper beam part B and the beam extension part E have vertical wall parts B1 and E1, upper wall parts B2 and E2 and lower wall parts B3 and E3, resin reinforcement ribs Br and Er are joined to inner surfaces of spaces Bk and Ek, extension dimensions of the upper wall part E2 and the lower wall part E3 of the beam extension part E are larger than extension dimensions of the upper wall part B2 and the lower wall part B3 of the bumper beam part B, a metal horizontal wall part SW is provided on the end of the beam extension part E, and the horizontal wall part SW and the reinforcement rib Er are separated from each other. The vehicle bumper A enables reduction in the weight compared to metal only, has sufficient absorption performance of impact energy, and achieves suppression in scattering of fragments.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle bumper used for a vehicle such as an automobile.

As a conventional bumper for a vehicle, for example, there is one described in Patent Document 1. The vehicle bumper described in Patent Document 1 is obtained by integrally molding a bumper beam made of fiber reinforced resin and a bumper extension made of fiber reinforced resin. The bumper beam is composed of a member having a unidirectional material in which reinforcing fibers are aligned in one direction and a cloth material in which reinforcing fibers are woven, and has an Θ-shaped cross section. This vehicle bumper has a lightweight structure, yet has desirable strength and rigidity, and exhibits energy absorption performance against a large external force such as a collision.

Japanese Patent No. 6265889

However, since the vehicle bumper as described above has an integrally molded structure of fiber reinforced resin, it is advantageous for weight reduction, but when it receives a large external force such as a collision, the beam extension breaks into a large lump and the beam extension breaks. There is a problem that the absorption performance of impact energy may be insufficient and there is a risk that debris may scatter and damage other parts in the vicinity, and it is a problem to solve such a problem. there were.

The present invention has been made by paying attention to the above-mentioned conventional problems, and by forming a composite of a metal member and a fiber-reinforced resin member, the weight can be reduced as compared with a metal alone, and a collision occurs. It is an object of the present invention to provide a vehicle bumper capable of sufficiently obtaining impact energy absorption performance against a large external force such as the above and suppressing the scattering of debris.

The vehicle bumper according to the present invention is integrally provided with a metal beam extension portion, which is a fixing portion to the vehicle body, on both left and right ends of the metal bumper beam portion. The bumper beam portion and the beam extension portion each have a vertical wall portion facing the vehicle body side, and an upper wall portion and a lower wall portion extending from the upper end and the lower end of the vertical wall portion to the vehicle body side, as well as the vertical wall portion. Reinforcing ribs made of resin are joined to the inner surface of the empty space formed by the upper wall portion and the lower wall portion. In the vehicle bumper, the extension dimensions of the upper wall portion and the lower wall portion in the beam extension portion are larger than the extension dimensions of the upper wall portion and the lower wall portion in the bumper beam portion, and the side of the vehicle body of the beam extension portion. A metal side wall portion is provided at the side end portion, and the reinforcing ribs in the beam extension portion are arranged apart from the side wall portion.

In the vehicle bumper according to the present invention, the bumper beam portion and the beam extension portion are both made of metal, have a vertical wall portion, an upper wall portion, and a lower wall portion, and form an empty space inside each wall portion. However, it has a structure in which a reinforcing rib made of resin is joined to the inner surface of the empty space. By adopting the above structure, the vehicle bumper is lighter than the metal alone and secures the predetermined rigidity of the bumper itself.

Since the above-mentioned vehicle bumper has a structure in which a hard resin (reinforcing rib) is joined to a metal having elongation characteristics, when a large external force such as a collision is applied, the reinforcing rib is not simply destroyed, but the metal is removed. The reinforcing ribs are destroyed while buckling and deforming. As a result, the vehicle bumper is finely broken without the reinforcing ribs being largely cracked due to the deformation of the metal. In addition, the fragments of the reinforcing ribs are particularly likely to scatter toward the side of the vehicle body. Therefore, the vehicle bumper is provided with a metal side wall portion at the end of the beam extension portion, and by separating the side wall portion and the reinforcing rib, the side wall portion remains without cracking and the fragments of the reinforcing rib are left. Suppress scattering.

In this way, the vehicle bumper according to the present invention can be made lighter than a single metal, can sufficiently absorb impact energy against a large external force such as a collision, and suppress the scattering of debris. Can be done.

It is a perspective view from the inside of the vehicle body which explains 1st Embodiment of the bumper for a vehicle which concerns on this invention. 1 is a plan view (A) of the vehicle bumper shown in FIG. 1, a cross-sectional view (B) based on the line I-I in FIG. A, and a side view (C) based on the line II-II in FIG. It is a perspective view (A) seen from the outside of the vehicle body and the perspective view (B) seen from the inside of the vehicle body which explains the 2nd Embodiment of the bumper for a vehicle which concerns on this invention. It is an exploded perspective view from the outside of the vehicle body which explains the 3rd Embodiment of the bumper for a vehicle which concerns on this invention. It is a perspective view seen from the inside of the vehicle body of the vehicle bumper shown in FIG. Front view (A) of the main part explaining the fourth embodiment, front view (B) of the main part explaining the fifth embodiment, front view (C) of the main part explaining the sixth embodiment, and the first 7 It is a front view (D) of the main part explaining embodiment.

<First Embodiment>
1 and 2 are diagrams illustrating an embodiment of a vehicle bumper according to the present invention.
In the illustrated vehicle bumper A, a metal beam extension portion E, which is a fixing portion to the vehicle body (partially shown by a dotted line in FIG. 2) M, is integrated on the left and right ends of the metal bumper beam portion B. Be prepared for. The vehicle bumper A is used for the front portion or the rear portion of the vehicle body M, but since both have the same basic configuration, they are not particularly distinguished in the present embodiment. Further, in the present embodiment, the directions of inside / outside, up / down / left / right, and the positional relationship of each constituent portion will be described with reference to the posture fixed to the vehicle body M.

The bumper beam portion B and the beam extension portion E are seamless metal integral structures such as welds, and the material is not particularly limited, but a steel material such as high-strength steel is preferably used. , In addition, an aluminum alloy or the like may be used. The integrated structure of the bumper beam portion B and the beam extension portion E can be formed by, for example, press working or die casting, and particularly when it is formed by deep drawing, it has strength due to work hardening. Become.

The bumper beam portion B and the beam extension portion E are the vertical wall portions B1 and E1 facing the vehicle body M side, and the upper wall portions B2 and E2 extending from the upper and lower ends of the vertical wall portions B1 and E1 to the vehicle body side and the lower portion. It has wall portions B3 and E3, respectively. Then, the bumper beam portion B and the beam extension portion E form empty spaces Bk and Ek opened to the vehicle body M side by the wall portions B1, E1, B2, E2, B3 and E3, respectively. Reinforcing ribs Br and Er made of resin are joined to the inner surface of Ek.

The material of the reinforcing ribs Br and Er is not particularly limited, but it is preferably a fiber reinforced resin, for example, a carbon fiber reinforced resin (CFRP) using a thermoplastic resin or a thermosetting resin as a base material. It is a glass fiber reinforced resin (GFRP), and engineering plastic or the like can also be used. The reinforcing ribs Br and Er can be directly joined to the bumper beam portion B and the beam extension portion E by injection molding or compression molding of the resin.

In the vehicle bumper A described above, as shown in FIG. 2, the extension dimension Eα of the upper wall portion E2 and the lower wall portion E2 in the beam extension portion E is the upper wall portion B2 and the lower wall portion in the bumper beam portion B. It is larger than the extension dimension Bα of B3 (Eα> Bα). Therefore, in the vehicle bumper A, a continuous region C in which the extension dimensions Bα of the upper wall portion B2 and the lower wall portion B3 of the bumper beam portion B gradually increase between the bumper beam portion B and each beam extension portion E. As shown in FIG. 2A, it has an arch shape as a whole in a plan view. The continuous region C in the illustrated example has an R shape in a plan view. The vehicle bumper A can also secure the strength against a collision by forming it into an arch shape as described above.

The vehicle bumper A is provided with a metal side wall portion SW at the lateral end of the beam extension portion E (left and right ends of the bumper A), and the reinforcing rib Er in the beam extension portion E is a side wall. It is arranged away from the portion SW. Further, the reinforcing rib Er in the beam extension portion E has a flat plate shape and is joined to the three sides of the vertical wall portion E1, the upper wall portion E2, and the lower wall portion E3 of the beam extension portion E.

In the vehicle bumper A described above, for example, one blank material is deeply drawn to integrally form the bumper beam portion B and the beam extension portion E. At that time, as shown by a virtual line in FIG. 1, the vehicle bumper A has a lateral wall portion SW continuously provided on the same plane at the end portion of the vertical wall portion E1 of the beam extension portion E. The side wall portion SW shown in the figure has fixing pieces for welding above and below it. Finally, the vehicle bumper A bends the side wall portion SW as shown by the arrow in the figure, and joins the fixing piece of the side wall portion SW to the upper wall portion B2 and the lower wall portion B3 of the beam extension portion E. .. Appropriate fixing means such as welding, bolts and adhesives can be adopted for this joining.

In the bumper beam portion B of the illustrated example, a plurality of reinforcing ribs Br are arranged in a plurality of directions. Specifically, the reinforcing ribs Br in the vertical direction are arranged at predetermined intervals in the left-right direction of the vehicle, and the reinforcing ribs Br in the diagonal direction are arranged so as to intersect between the three reinforcing ribs Br in the center, and the vertical wall portion B1 In the center of the above, a reinforcing rib Br is arranged over the entire longitudinal direction including the beam extension portion E.

In the beam extension portion E of the illustrated example, a plurality of (three) reinforcing ribs Er are arranged at predetermined intervals in the left-right direction of the vehicle. The plurality of reinforcing ribs Er are arranged in parallel with each other, and as described above, the outermost reinforcing rib Er and the side wall portion SW are separated from each other.

Further, in the vehicle bumper A, the bumper beam portion B has outward flanges Bf and Bf at the tips of the upper wall portion B2 and the lower wall portion B3 in the extending direction, respectively, as shown in FIG. 2 (B). It has a cross-sectional hat shape over the lateral direction of the vehicle. The flanges Bf and Bf of the bumper beam portion B are also formed in the continuous region C.

Further, in the vehicle bumper A, the beam extension portion E has outer flanges Ef and Ef at the tips of the upper wall portion E2 and the lower wall portion E3 in the extending direction, respectively, as shown in FIG. 2 (C). It has a cross-sectional hat shape across the vehicle lateral direction. The flanges Ef and Ef of the beam extension portion E are larger than the flanges Bf of the bumper beam portion B, and are used as fixing portions to the vehicle body M. The strength of the vehicle bumper A can also be ensured by forming the bumper beam portion B and the beam extension portion E into a cross-sectional hat shape as described above.

Further, as the vehicle bumper A, as described above, the reinforcing ribs Br and Er made of fiber reinforced resin can be adopted. In this case, the reinforcing ribs Br and Er are from the upper wall portions B2 and E2 to the lower wall portion. It is desirable to form the reinforcing fibers in a state of being oriented in the direction leading to B3 and E3.

The vehicle bumper A of the illustrated example has a front-back inverted concave-convex shape on the vertical wall portion B1 of the bumper beam portion B, and such a structure can further improve the rigidity.

In the vehicle bumper A having the above configuration, the bumper beam portion B and the beam extension portion E are both made of metal, and the vertical wall portions B1, E1, the upper wall portions B2, E2 and the lower wall portions B3, E3 are provided. It has a structure in which empty spaces Bk and Ek are formed inside these spaces, and resin reinforcing ribs Br and Er are joined to the inner surfaces of the empty spaces Bk and Ek. Due to this structure, the vehicle bumper A is lighter than a single metal and secures a predetermined rigidity of the bumper itself.

Since the vehicle bumper A has a structure in which a hard resin (reinforcing ribs Br, Er) is bonded to a metal having elongation characteristics, the reinforcing ribs Br, Er are simply destroyed when a large external force such as a collision is applied. The reinforcing ribs Br and Er are destroyed while the metal buckles and deforms.

In the vehicle bumper A described above, since the reinforcing ribs Br and Er are broken finely without being greatly cracked due to the deformation of the metal, the resistance force does not decrease sharply and the impact energy is effectively absorbed. Here, in the vehicle bumper, for example, when the side wall portion SW and the reinforcing rib Er are in contact with each other, the rigidity of the end portion becomes too high and the possibility that the side wall portion SW is broken when the reinforcing rib Er is destroyed is completely denied. Can not. Further, the fragments of the reinforcing rib Er are particularly likely to scatter toward the side of the vehicle body. On the other hand, the vehicle bumper A is provided with a side wall portion SW at the end of the beam extension portion E, and the side wall portion SW and the reinforcing rib Er are separated from each other, so that the side wall portion SW remains without cracking. However, the side wall portion SW suppresses the scattering of fragments of the reinforcing rib Er.

In this way, the vehicle bumper A can be made lighter than a single metal, can sufficiently absorb impact energy against a large external force such as a collision, and can suppress the scattering of debris. As a result, the vehicle bumper A can prevent a situation in which scattered debris damages another nearby component such as the bumper fascia. Therefore, it can also contribute to saving repair costs.

Here, in the vehicle bumper A, the structure in which the reinforcing rib Er in the beam extension portion E is separated from any of the vertical wall portion E1, the upper wall portion E2, and the lower wall portion E3 of the beam extension portion E, or the vehicle M If the structure is inclined with respect to the front-rear direction, when an external force is applied to the beam extension portion E, only the buckling of the metal precedes and the resistance force drops sharply, or the reinforcing rib Er is greatly cracked. The resistance may drop sharply.

On the other hand, the vehicle bumper A has a structure in which the reinforcing rib Er in the beam extension portion E is joined to the three sides of the vertical wall portion E1, the upper wall portion E2, and the lower wall portion E3 of the beam extension portion E. be. As a result, the vehicle bumper A can more reliably destroy the reinforcing ribs Br and Er due to the buckling deformation of the metal, and can contribute to further improvement of the impact energy absorption function.

3 to 6 are diagrams illustrating the second to seventh embodiments of the vehicle bumper according to the present invention. In each of the following embodiments, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

<Second Embodiment>
In the vehicle bumper A shown in FIG. 3, the left and right beam extension portions E and E have an extension portion EE in which the vertical wall portion E1, the upper wall portion E2 and the lower wall portion E3 are extended to the side of the vehicle body. It has a structure in which a reinforcing rib Er and a side wall portion SW are arranged on the extension portion EE.

The extension portion EE of the illustrated example extends to the outside of the vehicle body from the flange Ef of the beam extension portion E, and is continuous with the vertical wall portion E1 of the beam extension portion E via a curved surface, and is continuous with this curved surface. The portion that appears on the side surface of the vehicle body is the side wall portion SW. Further, inside the extension portion EE, a reinforcing rib Er separated from both is provided between the reinforcing rib Er of the beam extension portion E and the side wall portion SW.

Similar to the first embodiment, the vehicle bumper A having the above configuration can be lighter than a single metal, can sufficiently absorb impact energy against a large external force such as a collision, and has a reinforcing rib. It is possible to suppress the scattering of Er debris, and further, it is possible to secure the strength against a small overlap collision.

A small overlap collision is, in short, a collision in a narrow range of less than half on one side in front of the vehicle. It is well known that in the manufacture of automobiles, a minute lap collision test having an offset rate of about 25% is performed as a kind of offset frontal collision test in view of a small overlap collision.

Further, in the vehicle bumper A described above, for example, by deeply drawing a single blank material, the entire metal portion including the extension portion EE can be integrally molded. Further, as shown by a virtual line in FIG. 3A, the vehicle bumper A can arbitrarily change the angle of the end portion, so that it can correspond to the design of the outer shape of the vehicle body.

<Third Embodiment>
In the bumper A for vehicles shown in FIGS. 4 and 5, in the bumper beam portion B and the beam extension portion E, between the upper wall portions B2 and E2 and the lower wall portions B3 and E3, the empty space Bk. It is a structure provided with an inner wall portion IW that closes Ek. That is, the vehicle bumper A forms a closed space by the vertical wall portion B1, E1, the upper wall portion B2, E2, the lower wall portion B3, E3, the side wall portion SW, and the inner wall portion IW.

The manufacturing method of the vehicle bumper A is not limited, but for example, by deeply drawing one blank material, as shown in FIG. 4, other than the vertical wall portions B1 and E1. A molded body F in which a metal portion is integrated is molded. Next, after forming predetermined reinforcing ribs Br and Er inside the molded body F, the vertical wall portion B1 of the bumper beam portion B and the vertical wall portion E1 of the beam extension portion E are integrated into the molded body F. The panel body P is fixed.

Further, as shown in FIG. 5, the vehicle bumper A has plates Q and Q fixed to the surfaces of the left and right beam extension portions E on the vehicle body side, and is attached to the vehicle body via the plates Q and Q.

Similar to the first embodiment, the vehicle bumper A having the above configuration can be lighter than a single metal, can sufficiently absorb impact energy against a large external force such as a collision, and has a reinforcing rib. Scattering of Br and Er debris can be suppressed. Further, in the vehicle bumper A described above, a closed space is formed by a metal constituent portion, and the reinforcing ribs Br and Er are arranged in the closed space, so that the fragments of the reinforcing ribs Br and Er can be scattered more. Make sure to prevent it. Moreover, in the vehicle bumper A described above, the fine fragments of the reinforcing ribs Br and Er remaining in the closed space function as a cushioning material, and the impact energy absorption function is further improved.

<Fourth Embodiment>
The vehicle bumper A shown in FIG. 6A has a structure in which the side wall portion SW in the beam extension portion E has a shelf-shaped overhanging portion Eh protruding into the empty space Ek in the middle in the vertical direction. be. The overhanging portion Eh is formed by bending so that the middle of the side wall portion SW projects to one side.

The vehicle bumper A having the above configuration has the same operations and effects as those of the previous embodiment, and when the reinforcing rib Er is destroyed, the fragments thereof are the overhanging portion Eh as shown by the arrows in the figure. It may get caught in the car or remain on the overhanging part Eh. The fragments of the reinforcing rib Er also function as a cushioning material as described above. Therefore, in the vehicle bumper A of the illustrated example, not only the debris is deposited in the lower part of the empty space Ek, but also the debris is left in the middle part of the empty space Ek including the upper part of the overhanging portion Eh, so that the impact energy is generated. The absorption function can be further improved.

<Fifth Embodiment>
The vehicle bumper A, which is partially shown in FIG. 6B, has a structure in which the reinforcing rib Er in the beam extension portion E has a groove G for promoting fracture. A plurality of the grooves G can be formed in the vertical and horizontal directions and the diagonal directions on the main surface of the reinforcing rib Er forming a flat plate, and not only the rectangular cross section of the illustrated example but also the V shape of the cross section can be adopted.

The vehicle bumper A having the above configuration has the same operations and effects as those of the previous embodiment, and when impact energy is applied, the reinforcing rib Er is more reliably and finely broken as shown by the arrow in the figure. By breaking it finely, it is possible to prevent the metal side wall SW from being damaged by force majeure.

<Sixth Embodiment>
In the vehicle bumper A partially shown in FIG. 6C, the reinforcing rib Er in the beam extension portion E has a groove G for promoting fracture, and in particular, the groove G is formed on the main surface of the reinforcing rib Er on the vehicle body center side. It is a structure having. The grooves G in the illustrated example are arranged in the intermediate portion in the vertical direction of the reinforcing rib Er and are continuous in the horizontal direction, but a plurality of grooves G may be arranged at predetermined intervals.

The vehicle bumper A having the above configuration has the same operations and effects as those of the previous embodiment, and when impact energy is applied, the reinforcing rib Er is placed inside the vehicle body, that is, on the side wall, as shown by the arrows in the figure. It can be destroyed toward the opposite side of the portion SW, more sufficiently suppresses the scattering of debris to the outside, and prevents the metal side wall portion SW from being damaged by force majeure.

<7th Embodiment>
The vehicle bumper A shown in FIG. 6D is made of a fiber-reinforced resin in which the reinforcing rib Er in the beam extension portion E is oriented with reinforcing fibers in the direction from the upper wall portion E2 to the lower wall portion E3. .. That is, the reinforcing rib Er has a higher strength against a tensile load in the vertical direction.

The vehicle bumper A having the above configuration has the same operations and effects as those of the previous embodiment, and is easily deformed so that the upper wall portion E2 and the lower wall portion E3 open up and down when impact energy is applied. Prevent it from happening. As a result, the vehicle bumper A can suppress the easy buckling deformation of the thin metal and further enhance the absorption performance of the impact energy due to the large external force.

The structure of the vehicle bumper according to the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist of the present invention, and the configurations of the respective embodiments can be combined. It is possible.

A Vehicle bumper B Bumper beam part B1, E2 Vertical wall part B2, E2 Upper wall part B3, E3 Lower wall part Bk, Ek Empty space Br, Er Reinforcing rib E Beam extension part EE Extension part Eh Overhang part G groove IW Inner wall part SW Side wall part M Body

Claims (8)

A vehicle bumper that is integrally equipped with a metal beam extension that is a fixing part to the vehicle body on both the left and right ends of the metal bumper beam.
The bumper beam portion and the beam extension portion
It has a vertical wall portion facing the vehicle body side, and an upper wall portion and a lower wall portion extending from the upper ends and lower ends of the vertical wall portion to the vehicle body side, respectively, and also has the vertical wall portion, the upper wall portion, and the lower portion. Reinforcing ribs made of resin are joined to the inner surface of the empty space formed by the wall.
The extension dimensions of the upper wall portion and the lower wall portion in the beam extension portion are larger than the extension dimensions of the upper wall portion and the lower wall portion in the bumper beam portion, and the side of the vehicle body of the beam extension portion. With a metal side wall at the side end,
A vehicle bumper characterized in that the reinforcing ribs in the beam extension portion are arranged apart from the side wall portion. The bumper for a vehicle according to claim 1, wherein the reinforcing rib in the beam extension portion is joined to the vertical wall portion, the upper wall portion, and the lower wall portion of the beam extension portion, respectively. .. The beam extension portion has an extension portion in which the vertical wall portion, the upper wall portion, and the lower wall portion are extended to the side of the vehicle body.
The vehicle bumper according to claim 1 or 2, wherein the reinforcing rib and the lateral wall portion are arranged in the extension portion. One of claims 1 to 3, wherein the bumper beam portion and the beam extension portion are provided with an inner wall portion that closes the void between the upper wall portion and the lower wall portion. Bumper for vehicles described in. The vehicle bumper according to any one of claims 1 to 4, wherein the lateral wall portion has a shelf-shaped overhanging portion protruding into the empty space in the middle in the vertical direction. The vehicle bumper according to any one of claims 1 to 5, wherein the reinforcing rib in the beam extension portion has a groove for promoting fracture. The vehicle bumper according to claim 6, wherein the reinforcing rib has the groove on the surface on the center side of the vehicle body. The bumper for a vehicle according to any one of claims 1 to 5, wherein the reinforcing rib is made of a fiber-reinforced resin in which reinforcing fibers are oriented in a direction from the upper wall portion to the lower wall portion. ..

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