structural member

Abstract

A construction member (100) includes a first member (10), a second member (20), and a restriction portion (30). The first member (10) includes a top plate (11), longitudinal walls (121, 122), flanges (131, 132), and ridge portions (151, 152). The second member (20) includes a top plate (21), longitudinal walls (221, 222), flanges (231, 232), and ridge portions (251, 252). The longitudinal walls (221, 222) of the second member (20) are arranged along the longitudinal walls (121, 122) of the first member (10) on the inner sides of the longitudinal walls (121, 122). The flanges (231, 232) of the second member (20) are joined to the flanges (131, 132) of the first member (10), respectively. The restriction portion (30) is provided between the longitudinal walls (221, 222) of the second member (20). The restriction portion (30) restricts deformation in which the portions of the longitudinal walls (121, 122) of the first member (10) on the flange (131, 132) sides approach each other.

Description

Technical Field

[0001] This disclosure relates to a structural member, and more specifically to a structural member for a movable body having an elongated shape. Background Technology

[0002] For structural components used in moving bodies such as automobiles, there are requirements for lightweighting from the perspective of improving fuel efficiency, and on the other hand, there are also requirements for collision resistance. For example, a bumper reinforcement, as a structural component of an automobile, is located at the front or rear of the vehicle body and absorbs the impact by bending deformation when subjected to a collision load from the front or rear of the vehicle body. The goal of bumper reinforcement is to bear a large load with a small amount of deformation.

[0003] Patent Document 1 discloses a shape for a bumper reinforcement designed to suppress deformation during a collision. The bumper reinforcement of Patent Document 1 includes a first member and a second member. The first member has a cap-shaped cross-section. The second member is a closing plate that seals the opening of the first member. The first and second members each include a top plate, two longitudinal walls, and two flanges. The longitudinal walls of the second member are disposed opposite to the longitudinal walls of the first member on the inner side of the first member. The top plate of the second member has a protrusion projecting toward a side opposite to the top plate of the first member.

[0004] According to Patent Document 1, when a collision load is input to the bumper reinforcement from the second member side and the bumper reinforcement undergoes bending deformation, the ends of each longitudinal wall of the first member closest to the second member move toward the center of the bumper reinforcement in the vehicle height direction. That is, deformation occurs in the first member where the two longitudinal walls tilt inward. However, in the bumper reinforcement of Patent Document 1, when bending deformation occurs, the portion of the top plate of the second member, excluding the protrusion, moves toward the two longitudinal walls of the first member, thus suppressing the tilting of the two longitudinal walls of the first member.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent No. 6485606 Summary of the Invention

[0008] The problem the invention aims to solve

[0009] As described in Patent Document 1, when a collision load is input to the bumper reinforcement from the second member, which serves as a closing plate, deformation occurs in the first member where the two longitudinal walls tilt inward. If this deformation progresses further, it will cause cross-sectional collapse (plastic deformation) of the bumper reinforcement, resulting in a significant decrease in the load-bearing capacity of the bumper reinforcement.

[0010] In structural members that absorb impact during a collision, such as bumper reinforcements, the load-bearing capacity depends on the product of the cross-sectional height (length in the direction of load input) and the stresses generated at various locations. Therefore, if the cross-sectional height of a structural member decreases in the early stages of a collision, the member cannot withstand the impact load in the initial phase and is prone to plastic deformation. Thus, structural members must be designed to suppress the decrease in cross-sectional height during a collision to improve their load-bearing capacity.

[0011] The objective of this disclosure is to provide a structural member for a moving body that can improve its load-bearing capacity.

[0012] Solution for solving the problem

[0013] The disclosed structural member is a structural member for a movable body, having an elongated shape. The structural member includes a first member, a second member, and a limiting portion. The first member and the second member extend along the length direction of the structural member. The first member includes a first top plate, a pair of first longitudinal walls, a pair of first flanges, and a pair of first ridge portions. The pair of first longitudinal walls are arranged opposite to each other, and their end edges are connected to each other by the first top plate. The pair of first flanges are arranged on the side opposite to the first top plate relative to the first longitudinal walls, projecting outwards from the first longitudinal walls. The pair of first ridge portions connect the first longitudinal walls and the first flanges. The second member includes a second top plate, a pair of second longitudinal walls, a pair of second flanges, and a pair of second ridge portions. The second top plate is arranged inside the first longitudinal walls and is spaced apart from the first top plate. The pair of second longitudinal walls are arranged along the first longitudinal walls inside the first longitudinal walls, and their end edges are connected to each other by the second top plate. A pair of second flanges are positioned on the side opposite to the second top plate relative to the second longitudinal wall, protruding outward from the second longitudinal wall. The second flanges engage with the first flanges respectively. A pair of second ridge portions connect the second longitudinal wall and the second flanges. A limiting portion is provided between the pair of second longitudinal walls. The limiting portion restricts the deformation of the portions of the pair of first longitudinal walls on the side closest to the first flanges from moving closer together.

[0014] The effects of the invention

[0015] Using the structural components for moving bodies disclosed herein can improve load-bearing performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural components of the first embodiment.

[0017] Figure 2 This is a cross-sectional view of the structural components of the first embodiment.

[0018] Figure 3 yes Figure 2 The top view of the structural components shown.

[0019] Figure 4 yes Figure 2 A partial longitudinal sectional view of the structural component shown.

[0020] Figure 5 This is a partial longitudinal sectional view of the structural components of the second embodiment.

[0021] Figure 6 This is a cross-sectional view of the structural components of a modified example of the first embodiment.

[0022] Figure 7 These are cross-sectional views of the structural components of various embodiments.

[0023] Figure 8 This is a schematic diagram illustrating the basic conditions for simulating the three-point bending test in the first embodiment.

[0024] Figure 9 This is a cross-sectional view of the structural components of Comparative Example 1.

[0025] Figure 10 This is a cross-sectional view of the structural components of Comparative Example 2.

[0026] Figure 11 The load-displacement curve is obtained by simulation of a three-point bending test in the first embodiment.

[0027] Figure 12 The load-displacement curve is obtained by simulation through a three-point bending test in the second embodiment.

[0028] Figure 13 This is another load-displacement curve obtained through simulation of a three-point bending test in the second embodiment.

[0029] Figure 14 This is another load-displacement curve obtained through simulation of a three-point bending test in the second embodiment.

[0030] Figure 15 The load-displacement curve is obtained by simulation through a three-point bending test in the third embodiment.

[0031] Figure 16 The load-displacement curve is obtained by simulation through a three-point bending test in the fourth embodiment.

[0032] Figure 17 The load-displacement curve is obtained by simulation through a three-point bending test in the fifth embodiment. Detailed Implementation

[0033] The structural member of the embodiment is a structural member for a movable body, having an elongated shape. The structural member includes a first member, a second member, and a limiting portion. The first member and the second member extend along the length direction of the structural member. The first member includes a first top plate, a pair of first longitudinal walls, a pair of first flanges, and a pair of first ridge portions. The pair of first longitudinal walls are arranged opposite to each other, and their end edges are connected to each other by the first top plate. The pair of first flanges are arranged on the side opposite to the first top plate relative to the first longitudinal walls, protruding outward from the first longitudinal walls. The pair of first ridge portions connect the first longitudinal walls and the first flanges. The second member includes a second top plate, a pair of second longitudinal walls, a pair of second flanges, and a pair of second ridge portions. The second top plate is arranged inside the first longitudinal walls and is spaced apart from the first top plate. The pair of second longitudinal walls are arranged along the first longitudinal walls inside the first longitudinal walls, and their end edges are connected to each other by the second top plate. A pair of second flanges are positioned on the side opposite to the second top plate relative to the second longitudinal wall, protruding outward from the second longitudinal wall. The second flanges engage with the first flanges respectively. A pair of second ridge portions connect the second longitudinal wall and the second flanges. A limiting portion is provided between the pair of second longitudinal walls. The limiting portion restricts the deformation of the portions of the pair of first longitudinal walls on the side closest to the first flanges from moving closer together (first structure).

[0034] In the structural member of the first structure, the second longitudinal wall of the second member is disposed along the first longitudinal wall inside the first longitudinal wall of the first member. Furthermore, a limiting portion is provided between the second longitudinal walls to restrict the deformation of the portions of the pair of first longitudinal walls near the first flange side from moving closer together, i.e., the deformation of each first longitudinal wall tilting inwards towards the first member. Therefore, when a collision load is input to the structural member from the second member side, causing the first longitudinal wall to tilt inwards towards the first member, the tilting of the first longitudinal wall can be suppressed by the second longitudinal wall and the limiting portion. Thus, the reduction in the height of the cross-section of the structural member is suppressed during a collision with a moving body, and the structural member can withstand the collision load during a phase with a small amount of entry into the structural member. As a result, the load-bearing performance of the structural member relative to collision loads from the second member side can be improved.

[0035] The gap between the first longitudinal wall and the second longitudinal wall is preferably less than 2.0 mm (second structure).

[0036] According to the second structure, the second longitudinal wall of the second member is positioned sufficiently close to the first longitudinal wall of the first member. Therefore, it is possible to more effectively suppress the tilting of the first longitudinal wall towards the inside of the first member. This further improves the load-bearing capacity of the structural member relative to collision loads from the second member side.

[0037] The limiting section may consist of multiple reinforcing ribs. These reinforcing ribs protrude from the second top plate toward the side opposite to the first top plate. They also extend from one of the second longitudinal walls to the other, connecting to each other in the third structure.

[0038] According to the third structure, multiple reinforcing ribs are provided between the second longitudinal walls of the second member as a limiting part to prevent the first longitudinal wall of the first member from tipping over. These multiple reinforcing ribs can disperse the impact load along the length of the structural member. Therefore, the structural member is less prone to plastic deformation, and its load-bearing capacity can be maintained even if the amount of impact load entering the structural member increases. This further improves the load-bearing performance of the structural member relative to impact loads from the second member side.

[0039] In directions perpendicular to both the length direction of the structural member and the direction in which the first longitudinal wall is opposite to each other, the height of each of the plurality of reinforcing ribs is preferably less than 50% of the height of the second longitudinal wall (fourth structure).

[0040] In the fourth structure, in a direction perpendicular to the longitudinal direction of the structural member and the direction in which the first longitudinal wall of the first member is opposite to each other, the height of each stiffener relative to the height of the second longitudinal wall is set to 50% or less. Therefore, when an impact load is applied to the structural member from the second member side, the structural member is less prone to plastic deformation, and its load-bearing capacity can be maintained for a longer period. This further improves the load-bearing performance of the structural member relative to impact loads from the second member side.

[0041] The longitudinal spacing of the structural members between adjacent stiffeners in a plurality of stiffeners is preferably less than 45.0 mm (Structure 5).

[0042] In the fifth structure, the longitudinal spacing between the structural members and the stiffeners is set to be less than 45.0 mm. This effectively suppresses plastic deformation of the structural members when impact loads are applied from the second member side, allowing the structural members to withstand loads for a longer period. This further improves the load-bearing performance of the structural members relative to impact loads from the second member side.

[0043] At least a portion of the multiple reinforcing ribs can extend continuously from one of the second longitudinal walls to the other (Structure 6). Alternatively, all of the multiple reinforcing ribs can extend continuously from one of the second longitudinal walls to the other (Structure 7).

[0044] In the sixth or seventh structure, some or all of the stiffeners extend continuously from one of the second longitudinal walls of the second member to the other. This allows for more reliable suppression of the toppling of the first longitudinal wall of the first member when an impact load is applied to the structural member from the second top plate side. This further improves the load-bearing capacity of the structural member relative to impact loads from the second member side.

[0045] Alternatively, multiple reinforcing ribs may be arranged at uniform intervals along the entire length of the second member (the eighth structure).

[0046] In the structural member of the 8th structure, multiple reinforcing ribs are evenly distributed along the entire length of the 2nd member. In this case, the reinforcing ribs can effectively withstand the load regardless of where the impact load is input.

[0047] Alternatively, multiple reinforcing ribs may be arranged unevenly along the entire length of the second member (the ninth structure).

[0048] In the structural member of the 9th structure, multiple reinforcing ribs are unevenly distributed along the entire length of the 2nd member. That is, there are areas with a relatively high density of reinforcing ribs and areas with a relatively low density of reinforcing ribs along the entire length of the 2nd member. In this case, when an impact load is applied to the structural member, the areas with a lower density of reinforcing ribs in the structural member can deform before other areas.

[0049] Alternatively, the multiple reinforcing ribs may each have a curved shape protruding to the side opposite to the first top plate when viewed longitudinally in the structural member (Structure 10). Alternatively, the multiple reinforcing ribs may each have a corner formed by adjacent straight sections when viewed longitudinally in the structural member (Structure 11).

[0050] In the above-described structural members, the limiting part may also be integrally formed with the second member (the 12th structure). In this case, the increase in weight of the structural member caused by the limiting part can be suppressed.

[0051] The limiting part can also be included in a component (the 13th structure) that is independent of the second component. As a result, the shape of the second component is simplified, making it easier to form the second component.

[0052] The embodiments of this disclosure will now be described with reference to the accompanying drawings. Identical or equivalent structures in the drawings will be labeled with the same reference numerals, and identical descriptions will not be repeated.

[0053] <First Embodiment>

[0054] [Overall Structure]

[0055] Figure 1This is a schematic diagram of the structural member 100 for a movable body according to this embodiment. While not particularly limited, the movable body is, for example, a car. The structural member 100 is used, for example, as a component constituting the body of a car. The structural member 100 may be a bumper reinforcement. In this embodiment, an example of the structural member 100 being a bumper reinforcement will be described.

[0056] like Figure 1 As shown, the structural member 100 has an elongated shape. The structural member 100 is disposed at the front or rear of the vehicle body and extends generally along the width direction of the vehicle. Figure 1 In the example shown, the structural member 100 is bent in a manner that protrudes outward toward the outside of the vehicle body in the length direction.

[0057] The structural member 100 includes a first member 10 and a second member 20. The first member 10 and the second member 20 extend along the length direction of the structural member 100. That is, the first member 10 and the second member 20 extend along the width direction. The length of the first member 10 is substantially the same as the length of the second member 20, for example. However, there may be a slight difference between the lengths of the first member 10 and the second member 20.

[0058] The second component 20 is disposed on the outer side of the vehicle body relative to the first component 10. When the structural component 100 is a bumper reinforcement located at the front of the vehicle body, the second component 20 is disposed in front of the first component 10. When the structural component 100 is a bumper reinforcement located at the rear of the vehicle body, the second component 20 is disposed behind the first component 10. The two ends of the first component 10 in the vehicle width direction are supported, for example, by a crash box 200.

[0059] [Detailed Structure]

[0060] Next, refer to Figures 2-4 This section describes the more detailed structure of component 100. Figure 2 This is a cross-sectional view of structural component 100. Figure 3 This is a top view (view of structural member 100) obtained from the perspective of the second member 20. Figure 4 This is a partial longitudinal sectional view of structural member 100. The cross-section of structural member 100 refers to the section cut by a plane substantially perpendicular to the length direction of structural member 100. The longitudinal section of structural member 100 refers to the section cut by a plane substantially parallel to the length direction of structural member 100. (The following may sometimes refer to...) Figure 2 The vertical direction in the paper is called the vertical direction or height direction of the structural member 100 and is... Figure 2The direction orthogonal to the vertical direction in the paper is called the width direction, which describes the structure of the structural member 100. The vertical and width directions are approximately aligned with the length and height directions of the vehicle body on which the structural member 100 is installed, respectively.

[0061] (Component 1)

[0062] Reference Figure 2 The first component 10 has a substantially cap-shaped cross-section. The first component 10 includes a top plate 11, a pair of longitudinal walls 121, 122 and a pair of flanges 131, 132. The first component 10 also includes a pair of ridge portions 141, 142 and a pair of ridge portions 151, 152.

[0063] The roof plate 11 is the innermost part of the structural member 100 located on the vehicle body. The end edges of the longitudinal walls 121 and 122 are connected to each other by the roof plate 11. The longitudinal walls 121 and 122 project upwards from the roof plate 11. Figure 2 In the example shown, the longitudinal walls 121 and 122 are arranged at a slight inclination relative to the vertical direction (vehicle length direction). However, the longitudinal walls 121 and 122 can also be arranged substantially parallel to the vertical direction.

[0064] Longitudinal walls 121 and 122 are opposite to each other. That is, longitudinal walls 121 and 122 are configured such that their single sides face each other in the width direction of the structural member 100. Ridge portions 141 and 142 connect the top plate 11 and the longitudinal walls 121 and 122, respectively. One longitudinal wall 121 is connected to the top plate 11 by means of ridge portion 141. The other longitudinal wall 122 is connected to the top plate 11 on the opposite side of the longitudinal wall 121 by means of ridge portion 142. Ridge portions 141 and 142 are substantially arc-shaped, for example, in a transverse sectional view of the structural member 100.

[0065] Flanges 131 and 132 are positioned on the side opposite to the top plate 11 relative to the longitudinal walls 121 and 122, protruding outward from the longitudinal walls 121 and 122. Flanges 131 and 132 protrude outward in the width direction from the opposing longitudinal walls 121 and 122. Flanges 131 and 132 are respectively connected to the end edges of the longitudinal walls 121 and 122 on the side opposite to the end edge connected by the top plate 11. One flange 131 is connected to one longitudinal wall 121 by means of a ridge portion 151. The other flange 132 is connected to the other longitudinal wall 122 by means of a ridge portion 152. That is, the longitudinal wall 121 and flange 131 are connected by ridge portions 151 and 152, and the longitudinal wall 122 and flange 132 are connected by ridge portion 152. The longitudinal wall 121 and flange 131 can be integrally formed or formed separately and then joined by welding or the like. Similarly, the longitudinal wall 122 and the flange 132 can be integrally formed or formed separately and then joined by welding or the like. The ridge portions 151 and 152, for example, have a substantially arc shape when viewed in a transverse section of the structural member 100.

[0066] The first component 10 is formed from a sheet-like raw material. The material of the first component 10 is, for example, a metal such as steel or aluminum. The first component 10 is typically formed by stamping a metal sheet. However, the material of the first component 10 is not limited to metal. For example, carbon fiber reinforced plastic (CFRP) can also be selected as the material of the first component 10.

[0067] (Component 2)

[0068] The second member 20 closes the opening of the first member 10, which has a generally cap-shaped cross-section, forming a closed section together with the first member 10. The second member 20 includes a top plate 21, a pair of longitudinal walls 221, 222, and a pair of flanges 231, 232. The second member 20 also includes a pair of ridge portions 241, 242 and a pair of ridge portions 251, 252.

[0069] The top plate 21 is disposed inside the longitudinal walls 121 and 122 of the first member 10. That is, the top plate 21 is disposed between the longitudinal walls 121 and 122. The top plate 21 is disposed above the top plate 11 of the first member 10. The top plate 21 is spaced apart from the top plate 11 and faces it. The top plate 21 is separate from the top plate 11, so that even if the structural member 100 deforms due to impact load, it will not come into contact with the top plate 11.

[0070] Longitudinal walls 221 and 222 are disposed inside the longitudinal walls 121 and 122 of the first member 10. The end edges of the longitudinal walls 221 and 222 are connected to each other by the top plate 21. The longitudinal walls 221 and 222 protrude upward from the top plate 21.

[0071] Longitudinal walls 221 and 222 face each other. That is, longitudinal walls 221 and 222 are configured such that one side of each other faces each other in the width direction of the structural member 100. Ridge portions 241 and 242 connect longitudinal walls 221 and 222 to the top plate 21, respectively. One longitudinal wall 221 is connected to the top plate 21 by means of ridge portion 241. The other longitudinal wall 222 is connected to the top plate 21 on the opposite side of longitudinal wall 221 by means of ridge portion 242. Ridge portions 241 and 242, for example, have substantially arcuate shapes when the structural member 100 is viewed in transverse section.

[0072] The longitudinal walls 221 and 222 are arranged along the inner sides of the longitudinal walls 121 and 122 of the first member 10, respectively. One longitudinal wall 221 is close to one longitudinal wall 121 of the first member 10. The other longitudinal wall 222 is close to the other longitudinal wall 122 of the first member 10. The size of each gap G between the longitudinal walls 121 and 122 of the first member 10 and the longitudinal walls 221 and 222 of the second member 20 is preferably set to 2.0 mm or less. More preferably, each gap G is 0 mm. That is, preferably, the longitudinal walls 221 and 222 are in contact with the longitudinal walls 121 and 122, respectively. When the gap G is 0 mm, the longitudinal walls 221 and 222 can be joined to the longitudinal walls 121 and 122, respectively, by means of welding.

[0073] The longitudinal wall height H2 of the second component 20 is less than the longitudinal wall height H1 of the first component 10. The longitudinal wall height H2 is the height of the longitudinal walls 221 and 222 in a direction substantially perpendicular to both the length direction of the structural component 100 and the direction in which the longitudinal walls 121 and 122 of the first component 10 are opposite to each other. The height of the longitudinal walls 221 and 222 refers to the sum of their own vertical lengths and the vertical lengths of the respective edges 241, 242, and 251, 252. Similarly, the longitudinal wall height H1 is the height of the longitudinal walls 121 and 122 in a direction substantially perpendicular to both the length direction of the structural component 100 and the direction in which the longitudinal walls 121 and 122 of the first component 10 are opposite to each other. The height of the longitudinal walls 121 and 122 refers to the sum of their own vertical lengths and the vertical lengths of the respective edges 141, 142, and 151, 152. The ratio of the longitudinal wall height H2 to the longitudinal wall height H1 is preferably greater than 1 / 12, more preferably greater than 1 / 6. Furthermore, H2 / H1 is preferably less than 1 / 2, more preferably less than 1 / 3.

[0074] Flanges 231 and 232 are positioned on the side opposite to the top plate 21 relative to the longitudinal walls 221 and 222, projecting outward from the longitudinal walls 221 and 222. Flanges 231 and 232 project outward in the width direction from the opposing longitudinal walls 221 and 222. One flange 231 overlaps with and engages with one flange 131 of the first member 10. The other flange 232 overlaps with and engages with another flange 132 of the first member 10. The flanges 231 and 232 of the second member 20 are engaged with the flanges 131 and 132 of the first member 10, for example, by welding. Alternatively, the flanges 231 and 232 may also be mechanically engaged with the flanges 131 and 132 using rivets or the like.

[0075] Flanges 231 and 232 are respectively connected to the end edges of the longitudinal walls 221 and 222 on the side opposite to the end edge connected by the top plate 21. One flange 231 is connected to one longitudinal wall 221 by means of a ridge portion 251. The other flange 232 is connected to the other longitudinal wall 222 by means of a ridge portion 252. That is, the longitudinal wall 221 and the flange 231 are connected by the ridge portion 251, and the longitudinal wall 222 and the flange 232 are connected by the ridge portion 252. The longitudinal wall 221 and the flange 231 can be integrally formed or formed separately and then joined by welding or the like. Similarly, the longitudinal wall 222 and the flange 232 can be integrally formed or formed separately and then joined by welding or the like. The ridge portions 251 and 252 are substantially arc-shaped, for example, when viewed in a transverse section of the structural member 100.

[0076] The ridge portions 251 and 252 are respectively arranged along the ridge portions 151 and 152 of the first member 10. One ridge portion 251 is close to one ridge portion 151 of the first member 10. The other ridge portion 252 is close to the other ridge portion 152 of the first member 10. The size of each gap between the ridge portions 151 and 152 of the first member 10 and the ridge portions 251 and 252 of the second member 20 is preferably a maximum of about 2.0 mm. More preferably, the ridge portions 251 and 252 are in contact with the ridge portions 151 and 152, respectively.

[0077] The second component 20 is formed from a sheet-like raw material. The material of the second component 20 may be, for example, metal such as steel or aluminum. The second component 20 is typically formed by stamping a metal sheet. However, the material of the second component 20 is not limited to metal. For example, carbon fiber reinforced plastic (CFRP) can also be selected as the material of the second component 20. The material of the second component 20 may be the same as or different from the material of the first component 10. Furthermore, the thickness of the second component 20 may be the same as or different from the thickness of the first component 10.

[0078] (Restriction Department)

[0079] The structural member 100 also includes a limiting portion 30. The limiting portion 30 is located between a pair of longitudinal walls 221 and 222 of the second member 20. When a collision load is applied to the structural member 100 from the top plate 21 side of the second member 20, the limiting portion 30 restricts the deformation of the upper portions of the pair of longitudinal walls 121 and 122 of the first member 10 from approaching each other. The upper portions of the longitudinal walls 121 and 122 are the portions of the longitudinal walls 121 and 122 on the flange side 131 and 132. For example, the portion of the longitudinal walls 121 and 122 on the flange side refers to, in the height direction of the structural member 100, a range from the end of the longitudinal walls 121 and 122 on the flange side to a distance equal to one-third of the height of the longitudinal walls 121 and 122 at that end.

[0080] In this embodiment, the limiting part 30 consists of a plurality of reinforcing ribs 31. For example... Figure 2 As shown, the reinforcing ribs 31 protrude from the top plate 21 of the second member 20 toward the side opposite to the top plate 11 of the first member 10. Each reinforcing rib 31 is disposed between the longitudinal walls 221 and 222 of the second member 20. Each reinforcing rib 31 extends from one longitudinal wall 221 to the other longitudinal wall 222 and connects to each longitudinal wall 221, 222.

[0081] like Figure 3 As shown, a plurality of reinforcing ribs 31 are provided between the longitudinal walls 221 and 222, extending substantially parallel to the width direction of the structural member 100. Preferably, at least a portion of the plurality of reinforcing ribs 31 extend continuously from one longitudinal wall 221 to another longitudinal wall 222 without interruption. More preferably, all of the plurality of reinforcing ribs 31 extend continuously from one longitudinal wall 221 to another longitudinal wall 222 without interruption.

[0082] In this embodiment, the plurality of reinforcing ribs 31 are arranged at uniform intervals along the entire length of the second member 20. However, it is also possible that the plurality of reinforcing ribs 31 are not uniformly arranged along the entire length of the second member 20. That is, it is also possible that there are regions in the structural member 100 where the density of reinforcing ribs 31 between the longitudinal walls 221 and 222 is relatively high and regions where the density of reinforcing ribs 31 is relatively low.

[0083] Refer again Figure 2 Each reinforcing rib 31 has a reinforcing rib height H3. The reinforcing rib height H3 is the maximum height of each reinforcing rib 31 in a direction substantially perpendicular to both the length direction of the structural member 100 and the direction in which the longitudinal walls 121 and 122 of the first member 10 are opposite to each other. More specifically, the reinforcing rib height H3 is the distance in the height direction from the lower surface of the top plate 21 of the second member 20 (the surface closest to the first member 10) to the upper end of each reinforcing rib 31. The reinforcing rib height H3 of each reinforcing rib 31 is less than the longitudinal wall height H2 of the second member 20. The reinforcing rib height H3 is preferably 50% or less of the longitudinal wall height H2 (H3 / H2 ≤ 0.50). For example, the reinforcing rib height H3 can be set to 18% or more of the longitudinal wall height H2 (H3 / H2 ≥ 0.18).

[0084] like Figure 4 As shown, in this embodiment, a plurality of reinforcing ribs 31 are integrally formed with the top plate 21 of the second member 20. That is, in this example of the embodiment, a plurality of reinforcing ribs 31 are included in the second member 20. For example, the second member 20 with reinforcing ribs 31 is formed by stamping from a single sheet of metal.

[0085] Each reinforcing rib 31, when viewed longitudinally in the structural member 100, has a curved shape protruding to the side opposite to the top plate 11 of the first member 10. Each reinforcing rib 31, when viewed longitudinally in the structural member 100, has a smooth shape that is substantially without corners. The portion between adjacent reinforcing ribs 31 in the top plate 21 is a straight portion 211. Each straight portion 211, for example, has a straight shape that is substantially parallel to the length direction when viewed longitudinally in the structural member 100.

[0086] Along the length of the structural member 100, the interval (stiffener spacing) P between adjacent stiffeners 31 is preferably less than 45.0 mm. In this embodiment, the stiffener spacing P is the distance between the vertices of adjacent stiffeners 31. The stiffener spacing P can be set to, for example, 15.0 mm or more.

[0087] When the length of the range in which each reinforcing rib 31 exists in the longitudinal direction of the structural member 100 (excluding the straight portion 211) is defined as the reinforcing rib width W, the ratio of the reinforcing rib width W to the reinforcing rib spacing P can, for example, be greater than 32% (W / P > 0.32). Furthermore, the ratio of the reinforcing rib width W to the reinforcing rib spacing P can, for example, be set to less than 97% (W / P < 0.97).

[0088] [Effect]

[0089] The structural member 100 of this embodiment exhibits excellent load-bearing performance relative to collision loads from the second member 20 side. In detail, in the structural member 100 of this embodiment, the longitudinal walls 221 and 222 of the second member 20 are arranged along the longitudinal walls 121 and 122 inside the longitudinal walls 121 and 122 of the first member 10. Furthermore, a plurality of reinforcing ribs 31 are provided between the longitudinal walls 221 and 222 of the second member 20 to serve as limiting portions 30 for preventing the longitudinal walls 121 and 122 of the first member 10 from tilting inwards and causing their upper parts to approach each other. The reinforcing ribs 31 extend from one longitudinal wall 221 to the other longitudinal wall 222. When a collision load is input from the second member 20 to the structural member 100, causing the longitudinal walls 121 and 122 of the first member 10 to tilt inward in the width direction, the tilting of the longitudinal walls 121 and 122 can be suppressed by the longitudinal walls 221 and 222 and the reinforcing rib 31. As a result, for example, in a collision involving a moving vehicle, the reduction in the height of the cross-section of the structural member 100 can be suppressed, and the structural member 100 can withstand the collision load in the initial stage when the amount of entry into the structural member 100 is small. Furthermore, since the collision load can be distributed in the length direction of the structural member 100 by the reinforcing rib 31, the structural member 100 is less prone to plastic deformation, and the load-bearing capacity of the structural member 100 can be maintained even if the entry into the structural member 100 continues. This prevents the cross-section of the structural member 100 from collapsing during a collision, for example, before the deformation of the collision box 200 ends.

[0090] In this embodiment, the size of each gap G between the longitudinal walls 121, 122 of the first member 10 and the longitudinal walls 221, 222 of the second member 20 is preferably 2.0 mm or less. Therefore, the longitudinal walls 221, 222 of the second member 20 are positioned sufficiently close to the longitudinal walls 121, 122 of the first member 10. Thus, when a collision load is input to the structural member 100 from the second member 20 side, the tilting of the longitudinal walls 121, 122 of the first member 10 can be more effectively suppressed. This further improves the load-bearing performance of the structural member 100 relative to collision loads from the second member 20 side.

[0091] In this embodiment, the ridge portions 251 and 252 on the flange 231 and 232 sides of the second member 20 are arranged along the ridge portions 151 and 152 on the flange 131 and 132 sides of the first member 10. Therefore, the ridge portions 251 and 252 of the second member 20 can reinforce the ridge portions 151 and 152 of the first member 10. Thus, when a collision load is input to the structural member 100 from the second member 20 side, bending deformation of the ridge portions 151 and 152 of the first member 10 can be suppressed. This prevents a decrease in the load-bearing capacity of the structural member 100 due to bending deformation of the ridge portions 151 and 152.

[0092] In this embodiment, the stiffener height H3 of each stiffener 31 is preferably 50% or less of the longitudinal wall height H2 of the second member 20. By setting the stiffener height H3 in this way, the structural member 100 is less prone to plastic deformation when an impact load is input to the structural member 100 from the second member 20 side, and the load-bearing capacity of the structural member 100 can be maintained for a longer period of time. This further improves the load-bearing performance of the structural member 100 relative to the impact load from the second member 20 side.

[0093] The height of each stiffener 31 can be constant or variable along its entire length in the width direction of the structural member 100. For example, in each stiffener 31, the height of the ends on the longitudinal wall 221 side and / or the longitudinal wall 222 side can be greater than the height of other parts. In this case, the load-bearing capacity of the structural member 100 can be improved while suppressing the increase in weight of the structural member 100.

[0094] In this embodiment, the spacing P of the stiffeners is preferably less than 45.0 mm. In this case, when an impact load is input to the structural member 100 from the second member 20 side, the plastic deformation of the structural member 100 can be effectively suppressed, and the load-bearing capacity of the structural member 100 can be maintained for a longer period of time. This further improves the load-bearing performance of the structural member 100 relative to the impact load from the second member 20 side.

[0095] In this embodiment, preferably, at least a portion of the plurality of reinforcing ribs 31 extend continuously from one longitudinal wall 221 to another longitudinal wall 222 of the second member 20. More preferably, all the reinforcing ribs 31 extend continuously from one longitudinal wall 221 to another longitudinal wall 222. With such reinforcing ribs 31, the tilting of the longitudinal walls 121, 122 of the first member 10 when a collision load is input to the structural member 100 from the second member 20 side can be more reliably suppressed. This further improves the load-bearing performance of the structural member 100 relative to the collision load from the second member 20 side.

[0096] In this embodiment, multiple reinforcing ribs 31 may be evenly spaced along the entire length of the second member 20. In this case, the tilting of the longitudinal walls 121 and 122 of the first member 10 can be suppressed regardless of where the impact load is input in the longitudinal direction of the structural member 100. This allows for high load-bearing performance throughout the entire structural member 100.

[0097] In this embodiment, the multiple reinforcing ribs 31 may be unevenly distributed along the entire length of the second member 20. That is, there may be regions with a higher density of reinforcing ribs 31 and regions with a lower density of reinforcing ribs 31 along the entire length of the second member 20. Therefore, when a collision load is input to the structural member 100 from the second member 20 side, the regions with a lower density of reinforcing ribs 31 can deform first. For example, if there is a portion of the structural member 100 where the load-bearing capacity is intentionally reduced, reinforcing ribs 31 may not be provided in that portion, or reinforcing ribs 31 may be provided with a larger reinforcing rib spacing P than in other portions. Thus, regardless of the location of the collision load input in the structural member 100, the portion without reinforcing ribs 31 or the portion with a larger reinforcing rib spacing P can always deform.

[0098] In this embodiment, a plurality of reinforcing ribs 31 are integrally formed with the top plate 21 of the second member 20. This can suppress the increase in weight of the structural member 100 caused by the reinforcing ribs 31.

[0099] In this embodiment, each reinforcing rib 31 has a curved shape that protrudes to the side opposite to the top plate 11 of the first member 10 when viewed longitudinally in the structural member 100. Therefore, for example, in the case of a second member 20 formed by stamping a metal sheet to integrally form the reinforcing rib 31 with the top plate 21, the reduction rate of the sheet thickness of the reinforcing rib 31 can be suppressed.

[0100] <Second Implementation>

[0101] Figure 5 This is a partial longitudinal sectional view of the structural member 100A of the second embodiment. The structural member 100A has a structure that is substantially the same as that of the structural member 100 of the first embodiment. However, the structural member 100A differs from the structural member 100 of the first embodiment in that the reinforcing rib 31A is independent of the top plate 21A of the second member 20A.

[0102] like Figure 5 As shown, in this embodiment, a plurality of reinforcing ribs 31A are included in a separate member 40 relative to the top plate 21A of the second member 20A. The member 40 is disposed on one of the two surfaces of the top plate 21A of the second member 20A, opposite to the top plate 11 of the first member 10. The member 40 is fixed to the top plate 21A, for example, by welding, mechanical joining, etc. The member 40 includes a straight portion 41 between adjacent reinforcing ribs 31A.

[0103] The straight section 41 contacts the top plate 21A of the second member 20A. Each reinforcing rib 31A protrudes from the straight section 41 towards the side opposite to the top plate 11 of the first member 10. Figure 5In the example shown, each reinforcing rib 31A has a corner 313 formed by adjacent straight portions 311 and 312 in a longitudinal section of the structural member 100A. For example, each reinforcing rib 31A has a generally rectangular shape in a longitudinal section of the structural member 100A. As for the reinforcing rib 31A, the reinforcing rib height H3, the reinforcing rib spacing P, and the ratio W / P of the reinforcing rib width W to the reinforcing rib spacing P can be set in the same way as in the first embodiment.

[0104] The component 40, which includes the reinforcing rib 31A, is formed from a plate-shaped raw material. The material of component 40 may be, for example, metal such as steel or aluminum. Component 40 is typically formed by stamping a metal plate. However, the material of component 40 is not limited to metal. For example, carbon fiber reinforced plastic (CFRP) may also be selected as the material of component 40. The material of component 40 may be the same as or different from the material of the first component 10 or the second component 20A. Furthermore, the plate thickness of component 40 may be the same as or different from the plate thickness of the first component 10 or the second component 20A.

[0105] In this embodiment, a plurality of reinforcing ribs 31A are included in a member 40 that is independent of the second member 20A. Thus, unlike the first embodiment where the reinforcing ribs 31A are integral with the top plate 21 of the second member 20 (…), this embodiment… Figure 4 In comparison, the shape of the top plate 21A is simplified. Therefore, for example, when the second component 20A is formed by stamping, the second component 20A can be formed more easily. However, the way in which the top plate 21 of the second component 20 is integrally formed with the reinforcing rib 31A, as in the first embodiment, is advantageous in terms of reducing the weight of the structural components.

[0106] In this embodiment, each stiffener 31A has multiple corners 313 formed by straight portions 311 and 312. By having corners 313 in each stiffener 31A, it is possible to more reliably withstand impact loads input from the second member 20A to the structural member 100A. That is, by having corners 313 in each stiffener 31A, the impact loads applied to the structural member 100A are mainly distributed along the corners 313, thereby further improving the load-bearing performance of the structural member 100A. Furthermore, by forming the shape of each stiffener 31A in the longitudinal section of the structural member 100A into a polygonal shape, such as a rectangle, the line length of the member 40 is increased, thereby enabling it to withstand impact loads with a larger longitudinal cross-sectional area.

[0107] The above describes the implementation of this disclosure, but this disclosure is not limited to the above implementation. Various changes can be made as long as they do not depart from its spirit.

[0108] In the above embodiments, various shapes can be selected for the reinforcing ribs 31 and 31A. For example, in the first embodiment, in a longitudinal section view of the structural member 100, each reinforcing rib 31 has a curved shape protruding to the side opposite to the top plate 11 of the first member 10, and a straight portion 211 is provided between adjacent reinforcing ribs 31. However, for example, it is also possible to form a generally sinusoidal reinforcing rib 31 in a longitudinal section view of the structural member 100 on the top plate 21 of the second member 20. In this case, there is no straight portion 211 between adjacent reinforcing ribs 31.

[0109] Furthermore, for example, in the second embodiment, each reinforcing rib 31A has a generally rectangular shape when viewed longitudinally in the structural member 100A. However, it is also possible that each reinforcing rib 31A is formed into a polygonal shape other than a rectangular shape when viewed longitudinally in the structural member 100A. Alternatively, in the structural member 100A of the second embodiment, the shape of the reinforcing rib 31A can be replaced with the shape of each reinforcing rib 31 in the first embodiment. That is, in the structural member 100A, a curved reinforcing rib 31 can be formed on the member 40 instead of the reinforcing rib 31A. Similarly, in the structural member 100 of the first embodiment, the shape of the reinforcing rib 31 can be replaced with the shape of each reinforcing rib 31A in the second embodiment. That is, in the structural member 100, reinforcing ribs 31A having corner portions 313 can be integrally formed with the top plate 21 of the second member 20 instead of the reinforcing rib 31.

[0110] In the first embodiment described above, preferably, some or all of the reinforcing ribs 31 extend continuously from one longitudinal wall 221 of the second member 20 to another longitudinal wall 222. However, for example, it may also be as follows: Figure 6 As shown, each reinforcing rib 31 is cut off by at least one rib 50. The rib 50 is fixed to the top plate 21 of the second member 20 and extends along the length direction of the structural member 100. In this case, the rib 50 is preferably solid. Similarly, in the structural member 100A of the second embodiment described above, each reinforcing rib 31A extending between the longitudinal walls 221 and 222 can also be cut off by the rib 50.

[0111] In the above embodiments, the limiting portion 30 is a plurality of reinforcing ribs 31 or 31A. However, the limiting portion 30 may not necessarily have a plurality of reinforcing ribs. For example, it may also be as follows: Figure 7The limiting part 30 shown is a member 32 disposed between the longitudinal walls 221 and 222 of the second member 20. The member 32, which functions as the limiting part 30, is disposed between the longitudinal walls 221 and 222 in a state separate from the top plate 21, for example. The member 32 can also be fixed to the top plate 21 by means of a truss part 33 disposed between the member 32 and the top plate 21. Alternatively, the member 32 can also be fixed to the longitudinal walls 221 and 222 of the second member 20. The member 32 can be, for example, flat or corrugated. The member 32 can also have a ladder-like or lattice-like shape when viewed from above. Like the reinforcing ribs 31 and 31A, the member 32 can be integrally formed with the second member 20 or included in a member independent of the second member 20. Preferably, the member 32 is close to or in contact with the longitudinal walls 221 and 222 of the second member 20, and is disposed near the ridge portions 251 and 252 in the height direction of the structural member. However, it is preferable that the member 32 is arranged in a manner that does not overlap with the ridge portions 251 and 252.

[0112]

Example

[0113] The present disclosure is described in more detail below with reference to embodiments. However, the present disclosure is not limited to the following embodiments.

[0114] [First Embodiment]

[0115] To confirm the effectiveness of the automotive structural components disclosed herein, commercially available structural analysis software (LS-DYNA, manufactured by ANSYS) was used to analyze the components. Figures 2-4 The structural member 100 of the structure shown was subjected to a three-point bending test simulation. The raw materials and dimensions of each part of the structural member 100 in this simulation are shown below.

[0116] • Raw material for component 10: steel plate with tensile strength of 1470 MPa and thickness of 1.6 mm.

[0117] • The longitudinal wall height H1 of component 10 is 60mm.

[0118] • Width W1 of component 10: 80mm

[0119] • Raw material for component 20: steel plate with tensile strength of 1470 MPa and thickness of 1.6 mm.

[0120] • The longitudinal wall height H2 of the second component 20 is 16mm.

[0121] • Reinforcing rib height H3: 6.0mm

[0122] • Rib width W: 14.5mm

[0123] • Spacing of stiffeners P: 22.5mm

[0124] Figure 8 This is a schematic diagram illustrating the basic conditions for simulating a three-point bending test. For example... Figure 8 As shown, in this simulation, the second component 20 and the reinforcing rib 31 are supported by two fulcrums 300 on the upper part of the structural component 100, and the impactor 400 is pressed against the center of the structural component 100 along its length from above. The distance between the fulcrums 300 is set to 700 mm, the radius of curvature of each fulcrum 300 is set to 30 mm, the radius of curvature of the impactor 400 is set to 127 mm, and the collision speed of the impactor 400 is set to 22.5 km / h.

[0125] For comparison, simulations of the same three-point bending test as that for structural member 100 were also performed on structural member 100 with a different structure. Figure 9 and Figure 10 These are cross-sectional views of structural member 901 of Comparative Example 1 and structural member 902 of Comparative Example 2, respectively.

[0126] like Figure 9 As shown, the structural member 901 of Comparative Example 1 has the same first member 10 as structural member 100, but the second member 60 is a flat metal plate. The second member 60 of structural member 901 differs from the second member 20 of structural member 100 in that it does not have a pair of longitudinal walls along the longitudinal walls 121, 122 of the first member 10. Figure 10 As shown, the structural member 902 of Comparative Example 2 has the same first member 10 and second member 20 as the structural member 100, but does not have a reinforcing rib as a limiting part between the longitudinal walls 221 and 222 of the second member 20.

[0127] Figure 11 The load-displacement curves are obtained through simulation of a three-point bending test for the structural member 100 of the embodiment and the structural members 901 and 902 of Comparative Examples 1 and 2. Figure 11 As shown, in this embodiment, compared to Comparative Examples 1 and 2, a high load is obtained during the stage when the displacement (entry amount) of the impactor 400 is small. That is, when the collision load is input from the side of the second member 20, the structural member 100 of this embodiment is able to withstand a greater load than the structural member 901 of Comparative Example 1 and the structural member 902 of Comparative Example 2 during the initial stage of the collision.

[0128] In addition, according to Figure 11It can be seen that in the embodiment, the load reaches its maximum value when the displacement of the impactor 400 is around 25 mm, and then maintains a high load for a period of time. On the other hand, in Comparative Example 2, similarly to the embodiment, the load reaches its maximum value when the displacement of the impactor 400 is around 25 mm, but unlike the embodiment, the load immediately decreases afterward. This indicates that, compared to the structural member 100 in the embodiment, which can suppress plastic deformation even after reaching the maximum load, the structural member 902 in Comparative Example 2 experiences plastic deformation immediately upon reaching the maximum load. That is, in the structural member 100 of the embodiment, even with an increased insertion amount, plastic deformation is less likely to occur, and the load-bearing capacity can be maintained.

[0129] [Second Embodiment]

[0130] By changing the plate thickness of the second components 20 and 60, simulations of the same three-point bending test as described above were performed on the structural components 100, 901, and 902 used in the first embodiment. Figure 12 , Figure 13 and Figure 14 These are the load-displacement curves obtained by simulation through a three-point bending test for the Example, Comparative Example 1, and Comparative Example 2, respectively.

[0131] right Figure 13 Comparative Example 1 and Figure 14 Comparing with Comparative Example 2, the overall load is larger than that of Comparative Example 1. Figure 12 The illustrated embodiments and Figure 14 Compared to Comparative Example 2, the embodiment achieves a greater load capacity. For example, the maximum loads when the plate thickness of the second member 20 in the embodiment is 0.8 mm, 1.0 mm, 1.2 mm, and 1.4 mm are the same as the maximum loads when the plate thickness of the second member 20 in Comparative Example 2 is 1.0 mm, 1.2 mm, 1.4 mm, and 1.6 mm, respectively. Therefore, it can be said that, with the maximum load that can be borne when colliding from the side of the second member 20 set at the same level, the structural member 100 of the embodiment is lighter than the structural member 902 of Comparative Example 2.

[0132] [Embodiment 3]

[0133] A three-point bending test simulation, identical to that in the first embodiment, was performed on structural member 100 with the stiffener height H3 varying from 3.0 mm to 14.0 mm. The raw materials and dimensions of structural member 100, except for the stiffener height H3, are the same as in the first embodiment. The plate thickness of the second member 20 is set to 1.2 mm.

[0134] Figure 15This is the load-displacement curve obtained through simulation of a three-point bending test in this embodiment. For example... Figure 15 As shown, when the stiffener height H3 is 3.0 mm to 8.0 mm, it can maintain high loads for a longer period compared to when the stiffener height H3 of stiffener 31 is greater than 8.0 mm. Based on this result, if it is the structural member 100 used in this embodiment, the stiffener height H3 is preferably 8.0 mm or less. When the stiffener height H3 of this embodiment: 8.0 mm is converted to a ratio of 50% relative to the longitudinal wall height H2 of the second member 20: 16.0 mm, it can be said that the stiffener height H3 is preferably 50% or less of the longitudinal wall height H2 of the second member 20. Furthermore, when the lower limit value of the stiffener height H3 of this embodiment: 3.0 mm is converted to a ratio of 18% relative to the longitudinal wall height H2 of the second member 20: 16.0 mm, it is greater than 18%. Therefore, the stiffener height H3 of stiffener 31 is preferably greater than 18% of the longitudinal wall height H2 of the second member 20.

[0135] [Example 4]

[0136] A three-point bending test simulation, identical to that in the first embodiment, was performed on structural member 100 with the stiffener spacing P varying from 15.0 mm to 50.0 mm. The raw materials and dimensions of each part of structural member 100, except for the stiffener spacing P, are the same as in the first embodiment. The plate thickness of the second member 20 is set to 1.2 mm, the same as in the third embodiment.

[0137] Figure 16 This is the load-displacement curve obtained through simulation of a three-point bending test in this embodiment. For example... Figure 16 As shown, when the stiffener spacing P is 15.0 mm to 40.0 mm, it is possible to maintain high loads for a longer period compared to when the stiffener spacing P of the stiffener 31 is 45.0 mm or more. Based on this result, in the structural member 100 used in this embodiment, the stiffener spacing P is preferably less than 45.0 mm. Furthermore, in the structural member 100 used in this embodiment, the stiffener spacing P is preferably 15.0 mm or more.

[0138] In this embodiment, the ratio of the reinforcing rib width W: 14.5 mm to the reinforcing rib spacing P: 45.0 mm is greater than 32%. On the other hand, the ratio of the reinforcing rib width W: 14.5 mm to the reinforcing rib spacing P: 15.0 mm is less than 97%. Therefore, it can be said that the ratio of the reinforcing rib width W to the reinforcing rib spacing P is preferably greater than 32% and preferably less than 97%.

[0139] [Version 5]

[0140] A three-point bending test simulation, identical to that in the first embodiment, was performed on the structural member 100, with the gap G between the longitudinal walls 121, 122 of the first member 10 and the longitudinal walls 221, 222 of the second member 20 varying from 0 mm to 5.0 mm. The raw materials and dimensions of the structural member 100, except for the gap G, are the same as in the first embodiment. The plate thickness of the second member 20 is set to 1.2 mm.

[0141] Figure 17 This is the load-displacement curve obtained through simulation of a three-point bending test in this embodiment. For example... Figure 17 As shown, when the gap G is between 0 mm and 2.0 mm, a high load is obtained during the stage when the displacement (entry amount) of the impactor 400 is relatively small. However, when the gap G is 5.0 mm, the increase in the high load is slower compared to the case where the gap G is between 0 mm and 2.0 mm. Therefore, the size of the gap G between the longitudinal walls 121, 122 of the first member 10 and the longitudinal walls 221, 222 of the second member 20 is preferably 2.0 mm or less.

[0142] Explanation of reference numerals in the attached figures

[0143] 100, 100A, Structural components; 10, First component; 11, Top plate (first top plate); 121, 122, Longitudinal wall (first longitudinal wall); 131, 132, Flange (first flange); 151, 152, Ridge section (first ridge section); 20, 20A, Second component; 21, 21A, Top plate (second top plate); 221, 222, Longitudinal wall (second longitudinal wall); 231, 232, Flange (second flange); 251, 252, Ridge section (second ridge section); 30, Restriction section; 31, 31A, Reinforcing rib; 313, Corner section.

Claims

1. A structural member which is a structural member for a moving body having a long strip shape, wherein the structural member comprises: a first member extending along a length direction of the structural member, including a first top plate, a pair of first vertical walls disposed opposite to each other, end edges of the pair of first vertical walls being connected to each other by the first top plate, a pair of first flanges disposed on a side opposite to the first top plate with respect to the first vertical walls, protruding outward of the first vertical walls, and a pair of first ridge line portions connecting the first vertical walls and the first flanges; a second member extending along the length direction, including a second top plate disposed on an inner side of the first vertical walls, opposite to the first top plate at a spacing, a pair of second vertical walls disposed along the first vertical walls on the inner side of the first vertical walls, end edges of the pair of second vertical walls being connected to each other by the second top plate, a pair of second flanges disposed on a side opposite to the second top plate with respect to the second vertical walls, protruding outward of the second vertical walls, engaging with the first flanges, respectively, and a pair of second ridge line portions connecting the second vertical walls and the second flanges; and a restriction portion provided between the pair of second vertical walls, restricting deformation of portions of the pair of first vertical walls on the side of the first flanges toward each other. The restriction portion is a plurality of reinforcing ribs each protruding from the second top plate toward a side opposite to the first top plate, extending from one of the second vertical walls to the other second vertical wall, and connected to each of the second vertical walls.

2. The structural member according to claim 1, wherein a size of a gap between the first vertical walls and the second vertical walls is 2.0 mm or less.

3. The structural member according to claim 1, wherein a height of each of the plurality of reinforcing ribs in a direction perpendicular to both the length direction and the first vertical walls is 50% or less of a height of the second vertical walls.

4. The structural member according to claim 1, wherein a spacing in the length direction between adjacent ones of the plurality of reinforcing ribs is less than 45.0 mm.

5. The structural member according to claim 1, wherein at least some of the plurality of reinforcing ribs extend continuously from one of the second vertical walls to the other second vertical wall.

6. The structural member according to claim 5, wherein all of the plurality of reinforcing ribs extend continuously from one of the second vertical walls to the other second vertical wall.

7. The structural member according to claim 1, wherein the plurality of reinforcing ribs are disposed at uniform intervals over a full length of the second member.

8. The structural member according to claim 1, wherein the plurality of reinforcing ribs are disposed non-uniformly over the full length of the second member.

9. The structural member according to claim 1, wherein each of the plurality of reinforcing ribs has a curved shape protruding toward a side opposite to the first top plate when the structural member is viewed in a longitudinal cross section. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 10. The construction member according to claim 1, wherein the plurality of reinforcing ribs each have a corner portion formed by adjacent straight portions in a longitudinal section of the construction member.

11. The construction member according to any one of claims 1 to 10, wherein the restriction portion is formed integrally with the second member.

12. The construction member according to any one of claims 1 to 10, wherein the restriction portion is included in a member independent of the second member.

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