structural member

Abstract

A construction member (100) includes a first member (10), a second member (20), and a resin (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 side 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 resin (30) is filled between the longitudinal walls (221, 222) of the second member (20).

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 impacts 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, when the cross-sectional height of a structural member decreases in the early stages of a collision, the maximum load it can withstand (the load that induces plastic deformation) decreases, making the member more susceptible to plastic deformation. Thus, structural members are required to suppress the reduction 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 resin. The first member and the second member extend along the length 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 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 by the second top plate. A pair of second flanges are positioned on the opposite side of the second top plate relative to the second longitudinal wall, projecting outwards from the second longitudinal wall. The second flanges are engaged with the first flanges. A pair of second ridge portions connect the second longitudinal wall and the second flanges. Resin fills the space between the second longitudinal walls.

[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 This is a cross-sectional view of the structural components of the second embodiment.

[0019] Figure 4This is a schematic diagram illustrating the basic conditions of the three-point bending test in the first embodiment.

[0020] Figure 5 This is a cross-sectional view of the structural components of Comparative Example 1.

[0021] Figure 6 This is a cross-sectional view of the structural components of Comparative Example 2.

[0022] Figure 7 This is a cross-sectional view of the structural components of Comparative Example 3.

[0023] Figure 8 The load-displacement curve is obtained from the three-point bending test in the first embodiment.

[0024] Figure 9 The load / weight-displacement curve obtained by the three-point bending test in the first embodiment is shown.

[0025] Figure 10 The load / weight-displacement curve is obtained by simulation of a three-point bending test in the second embodiment.

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

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

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

[0029] Figure 14 The load / weight-displacement curve is obtained by simulation through a three-point bending test in the fifth embodiment.

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

[0031] Figure 16 This is another load / weight-displacement curve obtained through simulation of a three-point bending test in the sixth embodiment.

[0032] Figure 17 The load / weight-displacement curve obtained by the three-point bending test in the 7th embodiment is shown. Detailed Implementation

[0033] The structural member of the embodiment is a structural member for a movable body and has an elongated shape. The structural member includes a first member, a second member, and resin. 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 the end edges of the pair of first longitudinal walls 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 with respect to the first longitudinal walls and protrude 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 the end edges of the pair of second longitudinal walls are connected to each other by the second top plate. A pair of second flanges are positioned on the opposite side of the second top plate relative to the second longitudinal wall, protruding outward from the second longitudinal wall. The second flanges are engaged with the first flanges. A pair of second ridge portions connect the second longitudinal wall and the second flanges. Resin fills the space between the second longitudinal walls (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. Resin is then filled between the second longitudinal walls of the second member. Therefore, when a collision load is applied 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 resin. This suppresses the reduction of the cross-sectional height (length in the load input direction) of the structural member during a collision with a moving object. As a result, the maximum load that the structural member can withstand is increased. Therefore, the load-bearing capacity of the structural member relative to collision loads from the second member side can be improved.

[0035] According to the first structure, resin is used as the filler between the second longitudinal walls of the second member. Therefore, it is possible to improve the load-bearing capacity of the structural member without significantly increasing its weight.

[0036] The gap between the first longitudinal wall and the second longitudinal wall is preferably less than 2.0 mm (second structure).

[0037] 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. Consequently, the load-bearing capacity of the structural member relative to collision loads from the second member side can be further improved.

[0038] The resin filling height is preferably above the end of the second ridge portion near the second longitudinal wall (third structure).

[0039] According to the third structure, the resin between the second longitudinal walls is filled to a sufficient height to the end of the second ridge portion near the second longitudinal wall or beyond the end of the second ridge portion near the second longitudinal wall. Therefore, when an impact load is applied to the structural member from the second member side, the tilting of the first longitudinal wall of the first member can be more effectively suppressed. This further improves the load-bearing capacity of the structural member relative to impact loads from the second member side.

[0040] The second top plate may include a protrusion. This protrusion may, for example, project toward a side opposite to the first top plate and extend along the length of the structural member (the fourth structure).

[0041] According to the fourth structure, the second top plate of the second member has a protrusion that protrudes to the side opposite to the first top plate of the first member. This reduces the amount of resin filled between the second longitudinal walls, thereby making the structural member lighter. As a result, the maximum load per unit weight that the structural member can bear when an impact load is input from the second member side can be increased.

[0042] When the length of the protrusion in the direction in which the first longitudinal walls face each other is set as w2 and the distance between the first longitudinal walls in the direction in which the first longitudinal walls face each other is set as W1, w2 / W1 is preferably more than 1 / 2 and less than 7 / 8 (fifth structure).

[0043] According to the fifth structure, the length of the protrusion is appropriately set relative to the distance between the first longitudinal walls of the first member in the direction opposite to each other, i.e., in the width direction of the structural member. In this case, it is possible to further increase the maximum load per unit weight that the structural member can bear when a collision load is input from the second member side.

[0044] When the height of the second longitudinal wall in the direction perpendicular to both the length direction of the structural member and the direction in which the first longitudinal wall is opposite to each other is set to H2, and the height of the first longitudinal wall in the perpendicular direction is set to H1, H2 / H1 is preferably greater than 1 / 12 (Sixth Structure). H2 / H1 can be set to less than 1 / 2 (Seventh Structure).

[0045] According to the sixth or seventh structure, the ratio of the height of the second longitudinal wall to the height of the first longitudinal wall is appropriately set in two directions perpendicular to each other: the length direction of the structural member and the direction in which the first longitudinal wall of the first member is opposite to each other. This allows for a further increase in the maximum load that the structural member can withstand when a collision load is input from the second member side.

[0046] The resin can be continuously filled between the second longitudinal walls (the eighth structure) along the entire length of the second component.

[0047] In the structural member of the 8th structure, resin is continuously filled between the second longitudinal walls along the entire length of the second member. Therefore, regardless of where the impact load is input, the tilting of the first member toward the inside of the first longitudinal wall can be suppressed.

[0048] The resin can also be partially filled between the second longitudinal walls in the longitudinal direction of the second member (the 9th structure).

[0049] In the structural member of the 9th structure, resin is partially filled between the second longitudinal walls of the second member. That is, the structural member has portions where resin is present and portions where resin is not present along its length. In this case, when an impact load is applied to the structural member from the second member side, the portions of the structural member where resin is not present can deform before the portions where resin is present.

[0050] 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.

[0051] <First Embodiment>

[0052] [Overall Structure]

[0053] Figure 1 This is a schematic diagram of the structural member 100 for a moving body according to this embodiment. While not particularly limited, the moving body is, for example, a car. The structural member 100 is used, for example, as a component constituting the body of a car. In this case, 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] [Detailed Structure]

[0058] Next, refer to Figure 2 This describes the more detailed structure of component 100. Figure 2 This is a transverse sectional view of structural member 100. The cross-section of structural member 100 refers to the section cut by a plane substantially perpendicular to its length direction. (Hereinafter, it will sometimes be referred to as...) Figure 2 The vertical direction in the paper is called the vertical direction or height direction of the structural member 100 and is... Figure 2 The 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.

[0059] (Component 1)

[0060] 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.

[0061] 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 configured along a substantially vertical direction (the length of the vehicle). However, the longitudinal walls 121 and 122 may also be slightly inclined relative to the vertical direction.

[0062] 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.

[0063] 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 the ridge portion 151, and the longitudinal wall 122 and flange 132 are connected by the ridge portion 152. The longitudinal wall 121 and flange 131 can be integrally formed, or they can be 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.

[0064] 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.

[0065] (Component 2)

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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. Each gap G is more preferably 0 mm. That is, it is preferable that 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] Ridge portions 251 and 252 are respectively arranged along ridge portions 151 and 152 of the first member 10. One ridge portion 251 is adjacent to one ridge portion 151 of the first member 10. The other ridge portion 252 is adjacent 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. In this case, the ridge portions 251 and 252 can be joined to the ridge portions 151 and 152 by, for example, welding.

[0075] 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.

[0076] (resin)

[0077] The structural member 100 also includes resin 30. Resin 30 fills the space between the longitudinal walls 221 and 222 of the second member 20. The resin 30 is disposed between the longitudinal walls 221 and 222 in such a way that it fills the space between them. The resin 30 is in close contact with both the longitudinal walls 221 and 222. For example, the resin 30 can be filled between the longitudinal walls 221 and 222 by allowing liquid resin to flow into and solidify.

[0078] Resin 30 can fill the space between longitudinal walls 221 and 222 along the entire length of the second member 20. Alternatively, resin 30 can be partially filled between longitudinal walls 221 and 222 along the length of the second member 20. For example, resin 30 can also be dispersedly disposed between longitudinal walls 221 and 222 along the length of the structural member 100.

[0079] The resin 30 is in contact with the top plate 21 and longitudinal walls 221, 222 of the second member 20. The portion of the resin 30 that is not in contact with the second member 20 is open. That is, the surface of the resin 30 on the side opposite to the top plate 21 of the second member 20 is exposed from the structural member 100.

[0080] The resin 30 has a filling height H3. The filling height H3 is the length of the resin 30 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 filling height H3 is the distance in the height direction from the lower surface of the top plate 21 (the surface on the side of the first member 10) to the upper surface of the resin 30. The filling height H3 is preferably set to be above the ends 251a and 252a of the ridge portions 251 and 252 on the side of the longitudinal walls 221 and 222. That is, the resin 30 preferably fills from the top plate 21 between the longitudinal walls 221 and 222 to the position of the ends 251a and 252a, which are the rounded corner nodes on the lower side of the ridge portions 251 and 252, or beyond the ends 251a and 252a.

[0081] For example, the filling height H3 of resin 30 can be set to 50% or more of the longitudinal wall height H2 of the second component 20 (H3 / H2≥0.50). Preferably, the filling height H3 of resin 30 is 75% or more of the longitudinal wall height H2 of the second component 20 (H3 / H2≥0.75). The filling height H3 can also be greater than or equal to the longitudinal wall height H2. For example, the filling height H3 can be set to 150% or less of the longitudinal wall height H2 (H3 / H2≤1.50).

[0082] The resin 30 can be appropriately selected from materials with preferred physical properties. For example, from the viewpoint of suppressing deformation of the structural member 100, the resin 30 preferably has a compressive modulus of elasticity of 118 MPa or more. Furthermore, for example, from the viewpoint of lightweighting the structural member 100, the density of the resin 30 is preferably low to a certain extent. The foaming ratio of the resin 30 is, for example, 10 times or less, preferably 5 times or less.

[0083] [Effect]

[0084] 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, resin 30 is filled between the longitudinal walls 221 and 222 of the second member 20. When a collision load is input to the structural member 100 from the second member 20 side, 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 using the longitudinal walls 221 and 222 and the resin 30. 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, thereby increasing the maximum load that the structural member 100 can withstand. Therefore, it can prevent the cross section of the structural member 100 from collapsing during a collision, for example, before the deformation of the collision box 200 ends.

[0085] In the structural member 100 of this embodiment, resin 30 is filled between the longitudinal walls 221 and 222 of the second member 20. Therefore, compared with the case where metal or the like is used as the filler between the longitudinal walls 221 and 222, the degree of weight increase of the structural member 100 can be reduced. As a result, the load-bearing capacity of the structural member 100 can be improved while suppressing the weight increase of the structural member 100.

[0086] For example, when the opening of the second member 20 is closed by a sheet material and the entire surface of the resin 30 is covered, although the weight of the structural member increases, the maximum load that the structural member can bear does not increase proportionally. Therefore, it is not possible to efficiently increase the maximum load of the structural member. In this regard, in this embodiment, the surface of the resin 30 that is not in contact with the second member 20 is not covered by a sheet material or the like but is open. Therefore, according to the structure of this embodiment, the maximum load of the structural member 100 can be efficiently increased. Preferably, the entire surface of the surface of the resin 30 that is not in contact with the second member 20 is open, but it may also be partially open.

[0087] 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.

[0088] 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.

[0089] In this embodiment, the filling height H3 of the resin 30 is preferably above the ends 251a and 252a of the ridge portions 251 and 252 of the second member 20 on the side adjacent to the longitudinal walls 221 and 222. By ensuring the filling height H3 of the resin 30 sufficiently, the tilting of the longitudinal walls 121 and 122 of the first member 10 can be more effectively suppressed when an impact load is input to the structural member 100 from the side of the second member 20. As a result, the load-bearing performance of the structural member 100 relative to the impact load from the side of the second member 20 can be further improved.

[0090] In this embodiment, the ratio of the longitudinal wall height H2 of the second member 20 to the longitudinal wall height H1 of the first member 10, H2 / H1, is preferably greater than 1 / 12, and more preferably greater than 1 / 6. This further increases the maximum load that the structural member 100 can withstand when a collision load is input from the second member 20 side.

[0091] Furthermore, H2 / H1 is preferably 1 / 2 or less, more preferably 1 / 3 or less. This allows for a further increase in the maximum load that the structural member 100 can withstand when a collision load is input from the second member 20 side.

[0092] In this embodiment, resin 30 can be continuously filled between the longitudinal walls 221 and 222 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. As a result, a high load-bearing capacity can be achieved over the entire structural member 100 relative to the impact load from the side of the second member 20.

[0093] In this embodiment, the resin 30 may also be partially filled between the longitudinal walls 221 and 222 along the length of the second member 20. For example, the resin 30 can be dispersedly disposed at multiple locations along the length of the structural member 100. When the resin 30 is partially filled between the longitudinal walls 221 and 222 of the second member 20, when an impact load is input to the structural member 100 from the second member 20 side, the locations where the resin 30 is not disposed can deform first. For example, when there are portions in the structural member 100 where it is intended to reduce load-bearing capacity, the resin 30 can be disposed elsewhere instead of between the longitudinal walls 221 and 222 in those portions. Thus, in the structural member 100, regardless of the location of the impact load input, the portions where the resin 30 is not disposed can always deform.

[0094] In this embodiment, the resin 30 has, for example, a compressive modulus of elasticity of 118 MPa or higher. Therefore, when an impact load is applied to the structural member 100 from the second member 20 side, deformation of the longitudinal walls 121 and 122 of the first member 10, which tilt inward in the width direction, can be more effectively suppressed. When the compressive modulus of elasticity of the resin 30 is 118 MPa or higher, the first member 10 is preferably formed of a metal plate with a tensile strength of 1470 MPa or higher, and the thickness of the first member 10 is preferably 0.5 mm or more and 2.6 mm or less. Furthermore, when the compressive modulus of elasticity of the resin 30 is 118 MPa or higher, the second member 20 is preferably formed of a metal plate with a tensile strength of 980 MPa or higher, and the thickness of the second member 20 is preferably 0.5 mm or more and 2.6 mm or less.

[0095] <Second Implementation>

[0096] Figure 3 This is a cross-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 the structure of the top plate 21A of the second member 20A.

[0097] like Figure 3As shown, the top plate 21A of the second member 20A includes a main body 211 and a protrusion 212. The protrusion 212 protrudes from the main body 211 toward a side opposite to the top plate 11 of the first member 10. The protrusion 212 extends along the length direction of the structural member 100A. The protrusion 212 may extend along the entire length of the second member 20A, or it may be provided only in a portion of the second member 20A along the length direction of the structural member 100A.

[0098] The protrusion 212 includes a top 212a and side portions 212b and 212c. The top 212a is disposed on the side opposite to the top plate 11 of the first member 10 with respect to the main body 211. The side portions 212b and 212c connect the top 212a to the main body 211.

[0099] Resin 30 is filled between the longitudinal walls 221 and 222 of the second member 20 in the same manner as in the first embodiment. In addition to being in close contact with the longitudinal walls 221 and 222 of the second member 20, the resin 30 is also in close contact with the side portions 212b and 212c of the protrusion 212. Although the protrusion 212 can be entirely covered by the resin 30, it is preferable that its top 212a is exposed from the resin 30. When the top 212a of the protrusion 212 is exposed from the resin 30, when an impact load is input from the second member 20A to the structural member 100A, the protrusion 212 mainly bears the impact load, and the load input to the resin 30 is reduced. This suppresses the fracture of the resin 30, thus maintaining a high load-bearing capacity of the structural member 100A. Furthermore, by bearing the impact load through the protrusion 212, the structural member 100A is deformed to sandwich the resin 30 between the sides 212b, 212c of the protrusion 212 and the longitudinal walls 221, 222, thereby suppressing the peeling of the resin 30 from the second member 20.

[0100] In this embodiment, a protrusion 212 exists between the longitudinal walls 221 and 222. Therefore, the amount of resin 30 filling the space between the longitudinal walls 221 and 222 is reduced compared to the first embodiment, corresponding to the amount of the protrusion 212. This further reduces the weight of the structural member 100A. Furthermore, it can further increase the maximum load per unit weight that the structural member 100A can bear when an impact load is input from the side of the second member 20A.

[0101] The ratio of the width w2 of the protrusion 212 to the width W1 of the first member 10 is preferably, for example, 1 / 2 or more. Furthermore, w2 / W1 is preferably, for example, 7 / 8 or less. The width w2 is the length of the protrusion 212 in the direction in which the longitudinal walls 121 and 122 of the first member 10 are opposite to each other. On the other hand, the width W1 is the distance between the longitudinal walls 121 and 122 in the direction in which the longitudinal walls 121 and 122 of the first member 10 are opposite to each other. More specifically, the width W1 is the maximum distance in the width direction of the structural member 100 from the outer surface of one longitudinal wall 121 to the outer surface of the other longitudinal wall 122. By setting the width w2 of the protrusion 212 in this way, the structural member 100A can exhibit superior load-bearing performance when a collision load is input from the second member 20A side.

[0102] The ratio of the height h2 of the protrusion 212 to the height H2 of the longitudinal wall of the second member 20 is preferably 7 / 8 or more, for example. The height h2 is the length of the protrusion 212 in a direction perpendicular to both the length direction of the structural member 100A and the direction in which the longitudinal walls 121 and 122 of the first member 10 are opposite to each other. In this embodiment, the height h2 of the protrusion 212 is the distance in the height direction from the lower surface of the main body 211 to the upper surface of the top 212a. By setting the height h2 of the protrusion 212 in this way, the structural member 100A can exhibit superior load-bearing performance when an impact load is input from the side of the second member 20A.

[0103] In this embodiment, a single protrusion 212 is provided on the top plate 21A of the second member 20A, but it is also possible to provide multiple protrusions 212 arranged along the width direction of the structural member 100A on the top plate 21A. When multiple protrusions 212 are provided on the top plate 21A, the total width of each protrusion 212 is preferably more than 1 / 2 and less than 7 / 8 of the width W1 of the first member 10. The multiple protrusions 212 may have the same width or different widths.

[0104] Furthermore, when multiple protrusions 212 are provided on the top plate 21A, the multiple protrusions 212 may have the same height or different heights. In this case, it is preferable that at least one protrusion 212 has a height of more than 7 / 8 of the longitudinal wall height H2 of the second member 20.

[0105] 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.

[0106]

Example

[0107] The present disclosure is described in more detail below with reference to the embodiments. However, the present disclosure is not limited to the following embodiments.

[0108] [First Embodiment]

[0109] To confirm the effectiveness of the automotive structural components disclosed herein, a study was conducted on components having... Figure 1 and Figure 2 The structural member 100 of the structure shown underwent a three-point bending test. In this test, the first member 10 was formed from a steel plate with a tensile strength of 1470 MPa and a thickness of 1.6 mm. Furthermore, the second member 20 was formed from a steel plate with a tensile strength of 1470 MPa and a thickness of 1.0 mm. The resin 30 was formed using a material formed by foaming a two-component polyurethane resin material three times. The dimensions of each part of the structural member 100 are shown below.

[0110] • The longitudinal wall height H1 of component 10 is 60.0 mm.

[0111] • Width W1 of component 10: 80.0 mm

[0112] • The longitudinal wall height H2 of the second component 20 is 16.0 mm.

[0113] • The ratio of the filling height H3 of resin 30 to the longitudinal wall height H2: 100%

[0114] Figure 4 This is a schematic diagram illustrating the basic conditions of the three-point bending test in this embodiment. (As shown...) Figure 4 As shown, in the three-point bending test, the second component 20 and the resin 30 are supported by two fulcrums 300 on the upper structural member 100, and the impactor 400 is pressed against the center of the structural member 100 along its length from above. The distance between the fulcrums 300 is set to 700.0 mm, the radius of curvature of each fulcrum 300 is set to 25.0 mm, the radius of curvature of the impactor 400 is set to 50.0 mm, and the impact velocity of the impactor 400 is set to 1.0 mm / s.

[0115] For comparison, the same three-point bending test was also performed on structural members with different structures than structural member 100. Figures 5-7 These are cross-sectional views of structural components 901 to 903 of Comparative Examples 1 to 3, respectively.

[0116] like Figure 5 and Figure 7As shown, the structural member 901 of Comparative Example 1 and the structural member 903 of Comparative Example 3 have the same first member 10 as structural member 100, but the second member 40 is a flat metal plate. The second member 40 of structural members 901 and 903 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 and 122 of the first member 10. In the structural member 903 of Comparative Example 3, resin 30 is filled within the closed space defined by the first member 10 and the second member 40. Figure 6 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 there is no resin between the longitudinal walls 221 and 222 of the second member 20.

[0117] Figure 8 The load-displacement curves are obtained by using a three-point bending test for the structural member 100 of the embodiment and the structural members 901, 902, and 903 of Comparative Examples 1 to 3. Figure 9 The load / weight-displacement curves are obtained using a three-point bending test for the embodiments and comparative examples 1 to 3. Figure 9 Examples 1-3 illustrate the relationship between load per unit weight (kg) and impactor displacement.

[0118] like Figure 8 As shown, in the structural member 100 of the embodiment, since resin 30 is filled between the longitudinal walls 221 and 222 of the second member, the maximum load is significantly increased compared to the structural members 901 and 902 of Comparative Examples 1 and 2, which do not contain resin. Furthermore, in the embodiment, the energy absorption obtained by integrating the load in the load-displacement curve is also increased compared to Comparative Examples 1 and 2. Furthermore, comparing the embodiment with Comparative Example 3, the displacement (entry amount) of the impactor 400 under the maximum load of the embodiment is smaller. Based on this result, it can be said that when a collision load is input from the side of the second member 20, the structural member 100 of the embodiment can withstand a larger load and can withstand the load during a phase when the entry amount into the structural member 100 is small.

[0119] like Figure 9 As shown, in this embodiment, the maximum load per unit weight that the structural member 100 can bear is significantly increased compared to Comparative Examples 1-3. In other words, the structural member 100 of this embodiment can bear a larger load with a smaller weight during a collision. Therefore, by using the structural member 100, both lightweight design and improved load-bearing performance when a collision load is input from the second member 20 side can be achieved. Furthermore, in this embodiment, the energy absorption per unit weight is also increased compared to Comparative Examples 1-3.

[0120] [Second Embodiment]

[0121] A three-point bending test simulation was performed on structural member 100 using commercially available structural analysis software (LS-DYNA, manufactured by ANSYS). The basic conditions for the three-point bending test were the same as in the first embodiment. Furthermore, the dimensions and materials of each part of structural member 100 were also the same as in the first embodiment. However, in this embodiment, to confirm the effect of the resin filling height H3 on the load-bearing performance of structural member 100, the ratio (H3 / H2×100) of the resin filling height H3 to the longitudinal wall height H2 of the second member 20 was varied from 25% to 100%.

[0122] Figure 10 This is the load / weight-displacement curve obtained through simulation of a three-point bending test in this embodiment. Figure 10 For each structural member 100 with different ratios of resin 30 filling height H3 to the longitudinal wall height H2 of the second member 20, the relationship between load per unit weight and impactor displacement is shown. For example... Figure 10 As shown, as the filling height H3 of the resin 30 increases, the maximum load per unit weight that the structural member 100 can bear increases. When the ratio of the filling height H3 of the resin 30 to the longitudinal wall height H2 of the second member 20 is 50%, the maximum load increases significantly compared to when the ratio is 25%. If the filling height H3 of the resin 30 to the longitudinal wall height H2 of the second member 20 is 75% or more, the maximum load increases further. Therefore, the ratio of the filling height H3 of the resin 30 to the longitudinal wall height H2 of the second member 20 is preferably 50% or more, more preferably 75% or more. Furthermore, as the filling height H3 of the resin 30 increases, the energy absorption per unit weight also increases.

[0123] In the structural member 100 used in this embodiment, when the filling height H3 of the resin 30 is 75% of the longitudinal wall height H2 of the second member 20, the position of the upper surface of the resin 30 is approximately consistent with the position of the ends 251a and 252a of the ridge portions 251 and 252 on the side of the longitudinal walls 221 and 222. Therefore, it can be said that by setting the filling height H3 of the resin 30 to be above the ends 251a and 252a of the ridge portions 251 and 252 on the side of the longitudinal walls 221 and 222, the load-bearing performance when an impact load is input from the second member 20 side can be further improved.

[0124] [Third Embodiment]

[0125] For structural member 100, simulations of the same three-point bending test as in the second embodiment were performed with the foaming ratio of the two-component polyurethane resin material used to form resin 30 varying by 3, 5, and 10 times. The dimensions and materials of each part of structural member 100 are the same as in the first embodiment.

[0126] The density, compressive modulus, and yield stress of resin 30 are different for each foaming ratio. In resin 30 with a foaming ratio of 3, the density is 350 kg / m³. 3 The compressive modulus of elasticity is 190 MPa, and the yield stress is 8.5 MPa. In resin 30 with a foaming ratio of 5, the density is 250 kg / m³. 3 The compressive modulus is 118 MPa, and the yield stress is 3.3 MPa. In resin 30 with a foaming ratio of 10, the density is 110 kg / m³. 3 The compressive modulus is 42 MPa and the yield stress is 1.3 MPa.

[0127] Figure 11 This is the load / weight-displacement curve obtained through simulation of a three-point bending test in this embodiment. Figure 11 The relationship between load per unit weight and impactor displacement is shown for various structural components 100 with different foaming ratios of resin 30. For example... Figure 11 As shown, when the foaming ratio is 3x and 5x, the maximum load per unit weight is significantly increased compared to the case with a foaming ratio of 10x. Furthermore, when the foaming ratio is 3x and 5x, the energy absorption per unit weight is also increased compared to the case with a foaming ratio of 10x. Therefore, the foaming ratio of the resin 30 filled between the longitudinal walls 221 and 222 of the second member 20 is preferably 5x or less.

[0128] As long as the resin has a compressive modulus of elasticity equivalent to that of the 3x and 5x foamed resins used in this embodiment, the same load-bearing performance with respect to the structural member 100 can be obtained. That is, since the compressive modulus of elasticity of the resin 30 with a foaming ratio of 5x is 118 MPa and that of the resin 30 with a foaming ratio of 3x is 190 MPa, it can be said that as long as the compressive modulus of elasticity of the resin 30 is 118 MPa or higher, the load-bearing performance when an impact load is input from the second member 20 side can be effectively improved.

[0129] [Example 4]

[0130] For structural member 100, a simulation of the same three-point bending test as in the second embodiment was performed, with the longitudinal wall height H2 of the second member 20 varying from 3.0 mm to 35.0 mm. The dimensions of all parts of structural member 100 except for the longitudinal wall height H2 and the material of structural member 100 are the same as in the first embodiment.

[0131] Figure 12 and Figure 13 This is the load / weight-displacement curve obtained through simulation of a three-point bending test in this embodiment. Figure 12 and Figure 13 For each structural member 100 with different longitudinal wall heights H2 of the second member 20, the relationship between load per unit weight and impactor displacement is shown. For example... Figure 12 As shown, when the longitudinal wall height H2 is 10.0 mm to 20.0 mm, the maximum load per unit weight is the same, but when the longitudinal wall height H2 is 25.0 mm and 30.0 mm, the maximum load decreases slightly. When the longitudinal wall height H2 is 35.0 mm, the maximum load decreases significantly. Furthermore, compared to the case where the longitudinal wall height H2 is 10.0 mm to 20.0 mm, the energy absorption per unit weight is also smaller when the longitudinal wall height H2 is 25.0 mm and 30.0 mm, and becomes even smaller when the longitudinal wall height H2 is 35.0 mm. Therefore, in the structural member 100 used in this embodiment, the longitudinal wall height H2 of the second member 20 is preferably 30.0 mm or less, more preferably 20.0 mm or less. When converting the longitudinal wall height H2 of the second component 20 in this embodiment (30.0 mm, 20.0 mm) into a ratio H2 / H1 relative to the longitudinal wall height H1 of the first component 10 (60.0 mm), the ratios H2 / H1 are 1 / 2 and 1 / 3, respectively. Therefore, it can be said that H2 / H1 is preferably 1 / 2 or less, and more preferably 1 / 3 or less.

[0132] like Figure 13 As shown, compared to cases where the longitudinal wall height H2 is 5.0 mm or less and cases where the longitudinal wall height H2 is 10.0 mm or more, the maximum load per unit weight and the energy absorption are significantly reduced. Therefore, in the structural member 100 used in this embodiment, the longitudinal wall height H2 of the second member 20 is preferably greater than 5.0 mm, and more preferably 10.0 mm or more. In this embodiment, the ratios H2 / H1 of the longitudinal wall height H2 of the second member 20 (5.0 mm, 10.0 mm) relative to the longitudinal wall height H1 of the first member 10 (60.0 mm) are 1 / 12 and 1 / 6, respectively. Therefore, H2 / H1 is preferably greater than 1 / 12, and more preferably 1 / 6 or more.

[0133] [Version 5]

[0134] For structural member 100, a three-point bending test simulation, similar to that in the second embodiment, was performed 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 dimensions of all parts of structural member 100 except for the gap G and the material of structural member 100 are the same as in the first embodiment.

[0135] Figure 14 This is the load / weight-displacement curve obtained through simulation of a three-point bending test in this embodiment. Figure 14 For each structural member 100 with different gap G sizes between the longitudinal walls 121, 122 of the first member 10 and the longitudinal walls 221, 222 of the second member 20, the relationship between load per unit weight and impactor displacement is shown. For example... Figure 14 As shown, when the gap G is between 0 mm and 2.0 mm, the maximum load per unit weight is the same, but when the gap G is 5.0 mm, the maximum load decreases slightly. Furthermore, when the gap G is 5.0 mm, the energy absorption per unit weight is also reduced compared to when the gap G is between 0 mm and 2.0 mm. Therefore, 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.

[0136] [Sixth Embodiment]

[0137] For structural member 100A having a protrusion 212 in the top plate 21A of the second member 20A ( Figure 3 A simulation of the same three-point bending test as in the second embodiment was performed. In this embodiment, the width w2 and height h2 of the protrusion 212 were varied to confirm the effect of the protrusion 212 on the load-bearing performance of the structural member 100A. The dimensions of all parts of the structural member 100A except for the protrusion 212 and the material of the structural member 100A are the same as in the first embodiment. The conditions for the width w2 and height h2 of the protrusion 212 are shown in Table 1.

[0138] Table 1

[0139] Table 1

[0140]

[0141] Figure 15 and Figure 16 This is the load / weight-displacement curve obtained through simulation of a three-point bending test in this embodiment. Figure 15 and Figure 16 For structural member 100A in cases 1 to 10, the relationship between load per unit weight and impactor displacement is shown. Figure 15 and Figure 16 In order to make a comparison, for the structural member 100 in which the top plate 21 of the second member 20 does not have a protrusion 212, Figure 2 It also shows the relationship between the load per unit weight and the displacement of the impactor.

[0142] like Figure 15 and Figure 16 As shown, compared to the case where the top plate 21 of the second member 20 does not have a protrusion 212, the maximum load per unit weight increases in all cases from 1 to 10. Therefore, it can be seen that by providing a protrusion 212 in the top plate 21 of the second member 20, the load-bearing performance relative to the impact load from the second member 20 side is improved while making the structural member 100A lighter.

[0143] like Figure 15 As shown, in cases 2 to 5 where the width w2 of the protrusion 212 is 40 mm to 70 mm, i.e., the ratio of the width w2 of the protrusion 212 to the width W1 of the first member 10 is 50.0% to 87.5% (1 / 2 ≤ w2 / W1 ≤ 7 / 8), the maximum load per unit weight that the structural member 100A can bear becomes relatively large. Therefore, the ratio w2 / W1 of the width w2 of the protrusion 212 to the width W1 of the first member 10 is preferably more than 1 / 2 and less than 7 / 8.

[0144] like Figure 16 As shown, in cases 2 and 7 where the height h2 of the protrusion 212 is 14 mm or more, i.e., the ratio of the height h2 of the protrusion 212 to the longitudinal wall height H2 of the second member 20 is 87.5% or more (h2 / H2≥7 / 8), the maximum load per unit weight becomes particularly large. Therefore, the ratio h2 / H2 of the height h2 of the protrusion 212 to the longitudinal wall height H2 of the second member 20 is preferably 7 / 8 or more.

[0145] [Seventh Embodiment]

[0146] To confirm the effect of the protrusion 212, a three-point bending test, the same as in the first embodiment, was performed on the structural members 100 and 100A. In this test, the first member 10 was formed from a steel plate with a thickness of 1.6 mm, and the second member 20 was formed from a steel plate with a thickness of 1.0 mm. Figure 17 This is the load / weight-displacement curve obtained through a three-point bending test in this embodiment. Figure 17 The relationship between load per unit weight and impactor displacement is shown for each structural component 100 and 100A.

[0147] like Figure 17As shown, in the structural member 100A with a protrusion 212 in the second member 20A, the load per unit weight is significantly increased compared to the structural member 100 without a protrusion 212 in the second member 20A. This is because the protrusion 212 is exposed from the resin 30 through its top 212a, allowing it to bear the impact load and thus reducing the input load to the resin 30. Unlike the structural member 100 where the resin 30 fractures and peels before reaching the maximum load, in the structural member 100A, the resin 30 does not fracture or peel.

[0148] According to this embodiment, by providing the protrusion 212 in the second member 20A, the breakage and peeling of the resin 30 are suppressed, and the structural member 100A exhibits high load-bearing performance. In particular, it is considered that the protrusion 212 is effective in maintaining excellent load-bearing performance when the required load-bearing capacity is large and the resin 30 is prone to breakage and peeling.

[0149] Explanation of reference numerals in the attached figures

[0150] 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 portion (first ridge portion); 20, 20A, second component; 21, 21A, top plate (second top plate); 212, protrusion; 221, 222, longitudinal wall (second longitudinal wall); 231, 232, flange (second flange); 251, 252, ridge portion (second ridge portion); 30, resin.

Claims

1. A structural member for use in a movable body having an elongated shape, wherein, The structural components include: A first component, extending along the length of the structural component, includes: a first top plate; a pair of first longitudinal walls disposed opposite to each other, the end edges of the pair of first longitudinal walls being connected to each other by the first top plate; a pair of first flanges disposed on the side opposite to the first top plate with respect to the first longitudinal walls, projecting outward from the first longitudinal walls; and a pair of first ridge portions connecting the first longitudinal walls and the first flanges. A second component, extending along the length direction, includes: a second top plate disposed inside the first longitudinal wall and spaced apart from it; a pair of second longitudinal walls disposed inside the first longitudinal wall, their end edges connected by the second top plate; a pair of second flanges disposed on the opposite side of the second longitudinal wall from the second top plate, projecting outwards from the second longitudinal wall and engaging with the first flanges respectively; and a pair of second ridge portions connecting the second longitudinal walls and the second flanges; and Resin, which fills the spaces between the second longitudinal walls, The second component is positioned on the outside of the movable body relative to the first component. The resin filling height is more than 25% and less than 100% of the height of the second longitudinal wall.

2. The structural member according to claim 1, wherein, The gap between the first longitudinal wall and the second longitudinal wall is less than 2.0 mm.

3. The structural member according to claim 1 or 2, wherein, The resin filling height is above the end of the second ridge portion near the second longitudinal wall.

4. The structural member according to claim 1 or 2, wherein, The second top plate includes a protrusion that protrudes to the side opposite to the first top plate and extends along the length direction.

5. The structural member according to claim 4, wherein, When the length of the protrusion in the direction in which the first longitudinal walls are opposite to each other is set as w2 and the distance between the first longitudinal walls in the direction in which they are opposite to each other is set as W1, w2 / W1 is more than 1 / 2 and less than 7 / 8.

6. The structural member according to claim 1 or 2, wherein, When the height of the second longitudinal wall in the direction perpendicular to both the length direction and the direction in which the first longitudinal wall is opposite to each other is set as H2, and the height of the first longitudinal wall in the perpendicular direction is set as H1, H2 / H1 is greater than 1 / 12.

7. The structural member according to claim 6, wherein, The ratio of H2 to H1 is less than 1 / 2.

8. The structural member according to claim 1 or 2, wherein, The resin is continuously filled between the second longitudinal walls along the entire length of the second component.

9. The structural member according to claim 1 or 2, wherein, The resin is partially filled between the second longitudinal walls in the length direction of the second member.

Images