Impact absorption structure body and bumper core material

Abstract

To provide an impact absorption structure body capable of securing more amount of absorbable collision energy while suppressing reaction force generated in a collision initial period.SOLUTION: An impact absorption structure body includes: first and second support parts arranged at intervals with each other; and a plurality of deformation parts connected to the first and second support parts via first and second corresponding connection parts as first and second connection parts corresponding respectively. The plurality of deformation parts each have: first and second beam parts linearly extending while being inclined on the same side each other to a corresponding linear line passing the first and second corresponding connection parts as being separated from the first and second corresponding connection parts; and a third beam part connected to an end part at the opposite side to the first and second corresponding connection parts of the first and second beam parts and extending in a projecting curve shape to a side approaching to the corresponding linear line.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an impact absorbing structure and a bumper core material. [Background technology]

[0002] Patent Document 1 discloses a bumper core material made of a polypropylene-based resin foam. This type of bumper core material is provided, for example, on the inside of the front bumper of an automobile vehicle, and absorbs collision energy by deforming so as to crush when the vehicle collides with an object in front of it, thereby protecting the vehicle body and occupants inside the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-168077 A Summary of the Invention [Problem to be solved by the invention]

[0004] The bumper core material disclosed in Patent Document 1 is made of a polypropylene-based resin foam, and therefore can prevent a large impact force from being generated on a pedestrian in the event of a collision with the pedestrian, but since the amount of energy that can be absorbed by the deformation of the bumper core material itself is small, there is a risk that damage to the vehicle cannot be prevented when the vehicle collides with an object. Therefore, in order to achieve both an improvement in collision safety when the vehicle collides with a person and an improvement in preventing damage to the vehicle by absorbing the collision energy, it is necessary to devise an impact absorbing structure that can secure a larger amount of absorbable collision energy while suppressing the reaction force generated at the beginning of the collision as an impact absorbing structure used for the bumper core material, etc. [Means for solving the problem]

[0005] According to a first aspect of the present disclosure, there is provided an impact absorbing structure comprising first and second support portions arranged at a distance from each other, and a plurality of deformable portions connected to the first and second support portions via first and second corresponding connection portions which are corresponding first and second connection portions, respectively, wherein the plurality of deformable portions each have first and second beam portions which extend linearly while inclining toward the same side with respect to a corresponding straight line passing through the first corresponding connection portion and the second corresponding connection portion as they move away from the first and second corresponding connection portions, and a third beam portion which is connected to ends of the first and second beam portions opposite the first and second corresponding connection portions and extends in a convex curved manner toward the side approaching the corresponding straight line.

[0006] According to a second aspect of the present disclosure, there is provided a shock absorbing structure including first and second support parts spaced apart from each other in a first direction, and a pair of deformation parts provided between the first support part and the second support part. The pair of deformation parts includes a pair of first linear beam parts extending from the first support part in the first direction such that the distance therebetween gradually increases, a pair of second linear beam parts extending from the second support part in a direction opposite to the first direction such that the distance therebetween gradually increases, and a pair of arc-shaped beam parts provided between the pair of first linear beam parts and the pair of second linear beam parts and arranged such that the convex portions of the respective arcs face each other.

[0007] Other characteristics and advantages of the present disclosure can be seen from the following description and the accompanying drawings, given by way of example and non-exhaustively. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front view showing a shock absorbing structure according to an embodiment of the present disclosure. [Diagram 2] 2 is a diagram showing a load-displacement curve representing the relationship between a load applied to the shock absorbing structure shown in FIG. 1 from above and the amount of displacement of the shock absorbing structure. [Diagram 3] 3 is a diagram showing a deformation state of the shock absorbing structure at a characteristic stage of the load-displacement curve shown in FIG. 2. [Figure 4]1 is a perspective view showing an example of a bumper core material including an impact absorbing structure according to an embodiment of the present disclosure. [Diagram 5] FIG. 13 is a front view showing a shock absorbing structure according to another embodiment of the present disclosure. [Figure 6] FIG. 13 is a front view showing a shock absorbing structure according to another embodiment of the present disclosure. [Figure 7] 7 is a diagram showing a load-displacement curve representing the relationship between a load applied from above to the shock absorbing structure shown in FIG. 6 and the amount of displacement of the shock absorbing structure. FIG. [Figure 8] 8 is a diagram showing a deformation state of the shock absorbing structure at a characteristic stage of the load-displacement curve shown in FIG. 7. [Figure 9] FIG. 13 is a front view showing a shock absorbing structure according to another embodiment of the present disclosure. [Figure 10] FIG. 13 is a front view showing a shock absorbing structure according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0010] First, a configuration of a shock absorbing structure 100 according to an embodiment of the present disclosure will be described. Fig. 1 is a front view showing a shock absorbing structure according to an embodiment of the present disclosure.

[0011] As shown in Fig. 1, the shock absorbing structure 100 of this embodiment has first and second support parts 110, 120 arranged at an interval from each other, and first and second deformation parts 130, 140 provided between the first and second support parts 110, 120. The shock absorbing structure 100 is formed as one unit by these members 110-140. Note that Fig. 1 shows a schematic cross-sectional shape of each of the members 110-140 appearing on the front side of the shock absorbing structure 100, and these members 110-140 have a thickness and a depth on the rear side of the paper surface of Fig. 1.

[0012] The first and second deformation portions 130, 140 each have a first linear beam portion (first beam portion) 132, 142, a second linear beam portion (second beam portion) 134, 144, and a first and second arcuate beam portion (third beam portion) 136, 146 provided between the first linear beam portion 132, 142 and the second linear beam portion 134, 144. The first linear beam portions 132, 142 each have one end fixed to the first support portion 110 via a first fixing portion (first corresponding connection portion) 133, 143, and extend such that the distance between them increases as they move away from the first support portion 110. Similarly, the second linear beams 134, 144 have one end fixed to the second support 120 via second fixing parts (second corresponding connection parts) 135, 145, and extend such that the distance between them increases as they move away from the second support 120. The first and second arc-shaped beams 136, 146 are arranged such that the convex sides of the arcs face each other. In this way, the first and second deformation parts 130, 140 are arranged to be mirror images of each other.

[0013] More specifically, the first and second deformation parts 130, 140 are as follows. The first and second deformation parts 130, 140 are arranged side by side in the left-right direction of Fig. 1. In the first deformation part 130, the first and second linear beam parts 132, 134 extend while inclining toward the same side (left side in Fig. 1) with respect to a corresponding straight line L1 (see dashed line in Fig. 1) passing through the first and second fixed parts 133, 135 as they move away from the first and second fixed parts 133, 135, and the first arc-shaped beam part 136 is connected to the end of the first and second linear beam parts 132, 134 opposite to the first and second fixed parts 133, 135 and extends in a convex arc shape toward the side approaching the corresponding straight line L1 (right side in Fig. 1). In the second deformation portion 140, the first and second linear beam portions 142, 144 extend while inclining toward the same side (the right side in FIG. 1) of a corresponding straight line L2 (see the two-dot chain line in FIG. 1) passing through the first and second fixed portions 143, 145 as they move away from the first and second fixed portions 143, 145, and the second arc-shaped beam portion 146 is connected to the ends of the first and second linear beam portions 142, 144 opposite the first and second fixed portions 143, 145 and extends in an arc shape convex toward the side approaching the corresponding straight line L2 (the left side in FIG. 1). The corresponding straight lines L1, L2 are parallel to each other. The first and second linear beams 132, 134 of the first deformation section 130 and the first and second linear beams 142, 144 of the second deformation section 140 are all of the same length and extend in straight lines with the same inclination with respect to the corresponding straight lines L1, L2. The first and second arc-shaped beams 136, 146 extend in arc shapes with the same curvature. Note that the first and second arc-shaped beams 136, 146 are not limited to arc shapes as long as they are curved, and may be, for example, elliptical arc shapes or sine wave shapes.

[0014] In each of the deformation parts 130, 140, the first linear beam part 132, 142, the second linear beam part 134, 144, and the first and second arcuate beam parts 136, 146 between the first linear beam part 132, 142 and the second linear beam part 134, 144 are preferably integrally molded, and further, each of the deformation parts 130, 140 is preferably integrally molded with the first and second support parts 110, 120. The shock absorbing structure 100 of this embodiment can be configured as an integrally molded member integrally molded by, for example, injection molding, blow molding, extrusion molding, 3D printing of a resin material, or casting, forging, pressing, cutting, extrusion molding, 3D printing of a metal material. Alternatively, in the shock absorbing structure 100 of this embodiment, the beam portions in each of the deformation portions 130, 140 may be joined or fastened to each other by any fastening means such as adhesives, welding, bolting or riveting, and further, each of the deformation portions 130, 140 and the first and second support portions 110, 120 may be joined or fastened to each other by similar means.

[0015] Fig. 2 is a diagram showing a load-displacement curve showing the relationship between a load (reaction force of the shock absorbing structure 100) applied from above to the shock absorbing structure 100 shown in Fig. 1 and the amount of displacement (amount of displacement of the distance between the first and second support parts 110, 120) of the shock absorbing structure 100. Fig. 3 is a diagram showing a deformation state of the shock absorbing structure 100 at a characteristic stage of the load-displacement curve shown in Fig. 2.

[0016] Here, a description will be given of a specific example of the shock absorbing structure 100 of this embodiment. In this example, as an example, each component of the shock absorbing structure 100 is configured in accordance with the following requirements. (material) Polycarbonate (size) Overall dimensions of the structure 100: width (left-right direction in the figure) 33.4 mm, depth (direction on the paper surface in the figure) 150 mm, height (vertical direction in the figure) 80 mm Thickness of each part 110~140: 2.5mm Length of straight beams 132, 134; 142, 144: 29.1mm · Radius and arc length of arc beams 136 and 146: Radius 13.8 mm, arc length 30.8 mm Distance between the first linear beams 132, 142 at the connection with the first support 110 (distance between the centers of the beams): 6 mm Distance between the second linear beams 134, 144 at the connection with the second support 120 (distance between the centers of the beams): 6 mm

[0017] 2 and 3 show the results of a simulation of the load (reaction force) of the shock absorbing structure 100 constructed according to the above requirements and the amount of displacement in the vertical direction when a load is applied from above in the figure to the shock absorbing structure 100. As a result of the simulation, the inventors confirmed that the shock absorbing structure 100 deforms in the following order of first stage and second stage.

[0018] In the first stage of deformation of the shock absorbing structure 100, as shown in Figures 3(A) to 3(c), due to the deformation of the first straight beam portion 132, 142, the second straight beam portion 134, 144, and the first and second arcuate beam portions 136, 146, the inclination angles of the first straight beam portions 132, 142 and the second straight beam portions 134, 144 relative to the corresponding straight lines L1, L2 gradually increase while the curvature of the first and second arcuate beam portions 136, 146 gradually decreases, so that a portion of each of the first straight beam portions 132, 142 abuts against the first support portion 110 and a portion of each of the second straight beam portions 134, 144 abuts against the second support portion 120. In this first stage of deformation, as shown in FIG. 2, in the region where the displacement is 0 mm to approximately 10 mm, the load (reaction force) and the displacement increase gradually and approximately linearly as the displacement increases, while in the region where the displacement is approximately 10 mm to 42 mm, the load remains at approximately 1800 N to 2500 N even when the displacement increases.

[0019] In the second stage deformation of the shock absorbing structure 100, as shown in Fig. 3(C) to Fig. 3(E), in a state where a part of each of the first linear beam portions 132, 142 abuts against the first support portion 110 and a part of each of the second linear beam portions 134, 144 abuts against the second support portion 120, the curvature of the first and second arcuate beam portions 136, 146 gradually increases due to the deformation of the first and second arcuate beam portions 136, 146. In this second stage deformation, as shown in Fig. 2, in the region of the displacement amount of about 42 mm to about 50 mm, the load (reaction force) and the displacement amount gradually increase with an increase in the displacement amount in a substantially linear manner, and in the region of the displacement amount of about 50 mm to about 60 mm, the load remains at about 5500 N to 6000 N even if the displacement amount increases.

[0020] When the deformation of the shock absorbing structure 100 progresses further and reaches a so-called bottoming out state where it no longer deforms any more, the amount of displacement does not increase and only the load increases.

[0021] In this way, according to the shock absorbing structure 100 of the present embodiment, a load-displacement characteristic having two deformation regions is provided: a first displacement region (approximately 10 mm to approximately 42 mm in FIG. 2) in which the reaction force against the load is displaced while being substantially maintained in a first reaction force band where the reaction force against the load is relatively low, and a second displacement region (approximately 50 mm to approximately 60 mm in FIG. 2) in which the reaction force against the load is displaced while being substantially maintained in a second reaction force band where the reaction force against the load is relatively high. Therefore, the reaction force can be suppressed in the first displacement region, while the collision energy can be absorbed more in the second displacement region. That is, the amount of collision energy that can be absorbed can be secured more while suppressing the reaction force generated at the beginning of the collision. Therefore, when the shock absorbing structure 100 is used as a bumper core material of a vehicle, the reaction force is relatively small in the first displacement region, so that the impact given to a pedestrian can be suppressed, and the collision energy of the vehicle can be absorbed more in the second displacement region. As a result, it is possible to achieve both improved collision safety for people when a vehicle collides with them and better protection for the vehicle and its occupants by absorbing collision energy.

[0022] FIG. 4 is a perspective view showing an example of a bumper core material 200 including the shock absorbing structure 100 of this embodiment.

[0023] As shown in Fig. 4, the bumper core material 200 has a configuration in which the shock absorbing structures 100 of this embodiment are arranged in parallel in a row. The bumper core material 200 has a first side portion 210 and a second side portion 220, which also serve as the first and second support portions 110, 120 of the shock absorbing structure 100. By disposing the bumper core material 200 configured in this manner on the back side of the bumper of a vehicle, as described above, it is possible to increase the collision safety of a person when the vehicle collides with the person, and to absorb the collision energy to protect the vehicle and occupants in the vehicle.

[0024] In the above-described embodiment, the first and second deformation portions 130, 140 are arranged in this order from the left side of the shock absorbing structure 100 shown in Fig. 1, but the present invention is not limited to this. For example, the shock absorbing structures may be configured as shown in Figs. 5 and 6 as shock absorbing structures 100B, 100C.

[0025] The shock absorbing structure 100B shown in Fig. 5 differs from the shock absorbing structure 100 shown in Fig. 1 in that the arrangement of the first and second deformation parts 130, 140 in the left-right direction in the figure is swapped. That is, in the shock absorbing structure 100B, the second and first deformation parts 140, 130 are arranged in this order from the left side in the figure. The shock absorbing structure 100 and the shock absorbing structure 100B are identical to each other except for the swapped arrangement in the left-right direction in the figure, so the shock absorbing structure 100B can achieve the same effect as the shock absorbing structure 100.

[0026] The shock absorbing structure 100C shown in Fig. 6 differs from the shock absorbing structure 100 shown in Fig. 1 in that the first deformation portion 130 is replaced with a second deformation portion 140. That is, in the shock absorbing structure 100C, two second deformation portions 140 are arranged side by side in the left-right direction in the figure. When the shock absorbing structure 100C is viewed from the back side, it can be said that the two first deformation portions 130 are arranged side by side in the left-right direction in the figure.

[0027] Fig. 7 is a diagram showing a load-displacement curve representing the relationship between a load applied from above to the shock absorbing structure 100C shown in Fig. 6 and the amount of displacement of the shock absorbing structure 100C. Fig. 8 is a diagram showing a deformation state of the shock absorbing structure 100C at a characteristic stage of the load-displacement curve shown in Fig. 7. In the embodiment, as an example, the shock absorbing structure 200B is configured according to the same requirements as the shock absorbing structure 100 described above.

[0028] 7 and 8 show the results of simulating the load (reaction force) and the displacement in the vertical direction of the shock absorbing structure 100C when a load is applied from the top of the shock absorbing structure 100C, which is configured according to the same requirements as the shock absorbing structure 100. Comparing Fig. 2 with Fig. 7 and Fig. 3 with Fig. 8, it is found that the first and second stages in the simulation results for the shock absorbing structure 100 correspond to the first to fourth and second stages in the simulation results for the shock absorbing structure 100C, and Figs. 3(A) to 3(E) and Figs. 8(A) to 8(E) correspond to each other. Therefore, the shock absorbing structure 100C shown in Fig. 6 can also achieve the same effect as the shock absorbing structure 100 shown in Fig. 1.

[0029] The shock absorbing structure 100C is provided with two second deformation portions 140 (first deformation portions 130 when viewed from the rear side), but may be provided with three or more.

[0030] In the above-described embodiment, as in the shock absorbing structures 100 and 100B shown in Fig. 1 and Fig. 5, one first deformation portion 130 and one second deformation portion 140 are arranged to be mirror images of each other, but this is not limited thereto. For example, as in the shock absorbing structure 100D shown in Fig. 9, a plurality of first deformation portions 130 (three in Fig. 9) and the same number of second deformation portions 140 may be arranged to be mirror images of each other. In addition, the number of first deformation portions 130 and the number of second deformation portions 140 may be different.

[0031] In the above-mentioned embodiment, as in the shock absorbing structures 100 and 100B shown in FIG. 1 and FIG. 5, one set of the first and second deformation parts 130 and 140 is provided, but this is not limited thereto. For example, a plurality of sets of the first and second deformation parts 130 and 140 of the shock absorbing structure 100 may be arranged side by side (see FIG. 4). Also, a plurality of sets of the first and second deformation parts 130 and 140 of the shock absorbing structure 100B may be arranged side by side. Furthermore, n1 (n1≧1) sets of the first and second deformation parts 130 and 140 of the shock absorbing structure 100 and n2 (n2≧1) sets of the first and second deformation parts 130 and 140 of the shock absorbing structure 100B may be arranged side by side in any order. At least one of n3 (n3≧1) first deformation parts 130 and n4 (n4≧1) second deformation parts 140 may be added to these.

[0032] In the above-described embodiment, the first deformation portion 130 and / or the second deformation portion 140 are arranged side by side in the left-right direction as in the shock absorbing structures 100, 100B, 100C, 100D shown in Figures 1, 5, 6, and 9, but in addition to or instead of this, the first deformation portion 130 and / or the second deformation portion 140 may be arranged side by side in a direction penetrating the paper surface, for example.

[0033] In the above-mentioned embodiment, the first and second support parts 110, 120 are linear (flat) and the distance between them is constant, as in the shock absorbing structures 100, 100B, 100C shown in Figs. 1, 5, and 6, but are not limited thereto. For example, the first and second support parts 110, 120 may be curved (see Fig. 4). In addition to or instead of this, the distance between the first and second support parts 110, 120 may not be constant. For example, as in the shock absorbing structure 100E shown in Fig. 10, the second support part 120 may have a step, so that the distance between the first and second support parts 110, 120 may not be constant.

[0034] Although the present disclosure has been described above through the disclosed embodiments and examples, the above-mentioned embodiments and examples do not limit the invention according to the claims. In addition, combinations of the features described in the embodiments and examples of the present disclosure may also be included in the technical scope of the present disclosure.

[0035] [Note] [1] A first shock absorbing structure of the present disclosure is a shock absorbing structure comprising first and second support portions arranged at a distance from each other, and a plurality of deformable portions connected to the first and second support portions via first and second corresponding connecting portions which are corresponding first and second connecting portions, respectively, wherein the plurality of deformable portions each have first and second beam portions which extend linearly while inclining toward the same side with respect to a corresponding straight line passing through the first corresponding connecting portion and the second corresponding connecting portion as they move away from the first and second corresponding connecting portions, and a third beam portion which is connected to ends of the first and second beam portions opposite the first and second corresponding connecting portions and extends in a curved manner which is convex toward the side approaching the corresponding straight line.

[0036] In the first shock absorbing structure of the present disclosure, the multiple deformation parts each have a first beam part and a second beam part that extend linearly while inclining toward the same side with respect to a corresponding straight line passing through the first corresponding connecting part and the second corresponding connecting part as they move away from the first and second corresponding connecting parts, and a third beam part that is connected to the end of the first and second beam parts on the opposite side from the first and second corresponding connecting parts and extends in a curved shape that is convex toward the side approaching the corresponding straight line. This makes it possible to ensure a greater amount of absorbable collision energy while suppressing the reaction force generated at the beginning of the collision. The inventors confirmed this through simulations, etc.

[0037] [2] In the first shock absorbing structure of the present disclosure (the shock absorbing structure described in [1] above), at least a portion of the plurality of deforming portions may be arranged so that any number of first deforming portions extending while inclining toward one side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connecting portions and second deforming portions extending while inclining toward the other side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connecting portions are alternately arranged.

[0038] [3] In the first shock absorbing structure of the present disclosure (the shock absorbing structure described in [1] or [2] above), the plurality of deformation portions may have an equal number of first deformation portions extending while inclining to one side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connecting portions, and second deformation portions extending while inclining to the other side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connecting portions.

[0039] [4] In the first shock absorbing structure of the present disclosure (the shock absorbing structure described in any one of [1] to [3] above), each of the plurality of deforming portions may be configured to deform in the following order when a load is applied to at least one of the first and second support portions in a direction along the corresponding straight line: a first stage in which the curvature of the third beam portion decreases while the inclination angle of the first and second beam portions with respect to the corresponding straight line increases as the displacement amount between the first and second support portions increases until a portion of each of the first and second beam portions abuts against the first and second support portions; and a second stage in which the curvature of the third beam portion increases with a state in which a portion of each of the first and second beam portions abuts against the first and second support portions.

[0040] [5] In the first shock absorbing structure of the present disclosure (the shock absorbing structure described in any one of [1] to [4] above), the shock absorbing structure may be configured to exhibit, when a load is applied to at least one of the first and second support parts in a direction along the corresponding straight line, a first displacement region in which a displacement amount increases while maintaining a first reaction force band, and a second displacement region in which the displacement amount increases while maintaining a second reaction force band larger than the first reaction force band.

[0041] [6] In the first shock absorbing structure of the present disclosure (the shock absorbing structure according to any one of the above-mentioned [1] to [5]), the shock absorbing structure may be integrally molded.

[0042] [7] The bumper core material of the present disclosure is characterized in that it includes the first shock absorbing structure of the present disclosure (the shock absorbing structure described in any one of [1] to [6] above). Therefore, it can achieve the same effects as those achieved by the first shock absorbing structure of the present disclosure.

[0043] [8] A second shock absorbing structure of the present disclosure includes first and second support parts arranged at a distance from each other in a first direction, and a pair of deformable parts provided between the first support part and the second support part, wherein the pair of deformable parts have a pair of first linear beam parts extending from the first support part in the first direction so that the distance between them gradually increases, a pair of second linear beam parts extending from the second support part in a direction opposite to the first direction so that the distance between them gradually increases, and a pair of arc-shaped beam parts provided between the pair of first linear beam parts and the pair of second linear beam parts, and arranged so that the convexities of each arc face each other.

[0044] In the second shock absorbing structure of the present disclosure, the pair of deformation parts includes a pair of first linear beam parts extending from the first support part in the first direction such that the distance between them gradually increases, a pair of second linear beam parts extending from the second support part in the opposite direction to the first direction such that the distance between them gradually increases, and a pair of arc-shaped beam parts provided between the pair of first linear beam parts and the pair of second linear beam parts and arranged such that the convex parts of the arcs face each other. This makes it possible to more fully secure the amount of absorbable collision energy while suppressing the reaction force generated at the beginning of the collision. The inventors confirmed this through simulations and the like.

[0045] [9] In the second shock absorbing structure of the present disclosure (the shock absorbing structure described in [8] above), the shock absorbing structure may be configured to provide a first displacement region that displaces while maintaining a first reaction force band, and a second displacement region that displaces while maintaining a second reaction force band larger than the first reaction force band, when a load is applied to the first support part or the second support part along the first direction.

[0046]

[10] In the second shock absorbing structure of the present disclosure (the shock absorbing structure described in [8] or [9] above), the shock absorbing structure may be integrally molded.

Claims

1. First and second support parts arranged at a distance from each other; a plurality of deformation portions connected to the first and second support portions via first and second corresponding connection portions, which are corresponding first and second connection portions, respectively; A shock absorbing structure comprising: Each of the plurality of deformation portions is first and second beam portions extending linearly and inclining toward the same side with respect to a corresponding straight line passing through the first and second corresponding connection portions as the beam portions move away from the first and second corresponding connection portions; a third beam portion connected to the end of each of the first and second beam portions on the opposite side to the first and second corresponding connection portions and extending in a convex curved shape on a side approaching the corresponding straight line; Shock absorbing structure.

2. The shock absorbing structure according to claim 1, At least some of the plurality of deformation portions are arranged so that an arbitrary number of first deformation portions extending while inclining toward one side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connection portions, and second deformation portions extending while inclining toward the other side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connection portions are alternately arranged. Shock absorbing structure.

3. The shock absorbing structure according to claim 1, the plurality of deformation portions include an equal number of first deformation portions extending while inclining toward one side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connection portions, and second deformation portions extending while inclining toward the other side with respect to the corresponding straight line as the first and second beam portions move away from the first and second corresponding connection portions; Shock absorbing structure.

4. The shock absorbing structure according to claim 1, Each of the plurality of deformation portions is When a load is applied to at least one of the first and second support portions in a direction along the corresponding straight line, as the displacement amount of the distance between the first and second support portions increases, a first stage in which the curvature of the third beam portion decreases while the inclination angles of the first and second beam portions with respect to the corresponding straight line increase until a portion of each of the first and second beam portions abuts against the first and second support portions; a second stage in which a curvature of the third beam portion increases while a portion of each of the first and second beam portions is in contact with the first and second support portions; The deformation is configured in the order of Shock absorbing structure.

5. The shock absorbing structure according to claim 1, The shock absorbing structure is configured to exhibit, when a load is applied to at least one of the first and second support parts in a direction along the corresponding straight line, a first displacement region in which a displacement amount increases while maintaining a first reaction force band, and a second displacement region in which the displacement amount increases while maintaining a second reaction force band larger than the first reaction force band. Shock absorbing structure.

6. The shock absorbing structure according to claim 1, The shock absorbing structure is integrally formed. Shock absorbing structure.

7. A bumper core material comprising the shock absorbing structure according to claim 1.

8. First and second support portions spaced apart from each other in a first direction; A pair of deformation portions provided between the first support portion and the second support portion; Including, The pair of deformation portions are a pair of first linear beam portions extending from the first support portion in the first direction such that the distance between the first linear beam portions gradually increases; a pair of second linear beam portions extending from the second support portion in a direction opposite to the first direction such that the distance between the second linear beam portions gradually increases; a pair of arc-shaped beam portions provided between the pair of first linear beam portions and the pair of second linear beam portions, the arc-shaped beam portions being arranged such that the convex portions of the respective arcs face each other; A shock absorbing structure.

9. 9. The shock absorbing structure according to claim 8, wherein the shock absorbing structure is configured to provide a first displacement region that displaces while maintaining a first reaction force band, and a second displacement region that displaces while maintaining a second reaction force band that is larger than the first reaction force band, when a load is applied to the first support portion or the second support portion along the first direction.

10. The shock absorbing structure according to claim 8, wherein the shock absorbing structure is integrally molded.

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