Structural parts

Abstract

A structural component (100, 200) is provided with a top plate (10) and side walls (21, 22). The structural component (100, 200) includes a curved region (30). When viewed from the side wall (21, 22) side, the curved region (30) is curved such that the top plate (10) side is on the inside of the curve and the opposite side to the top plate (10) is on the outside of the curve. In the curved region (30), the side walls (21, 22) are connected by the top plate (10) on the inside of the curve. The curved region (30) is open on the outside of the curve. When the curved region (30) is viewed in a cross section, ends (211, 221) of the top plate (10) in each of the side walls (21, 22) are disposed inside the structural component (100, 200) with respect to boundary portions (212, 222) between the side walls (21, 22) and the top plate (10). When the curved region (30) is viewed in the cross section, the total of the lengths of the side walls (21, 22) is greater than the length of the top plate (10).

Description

[Technical Field]

[0001] The present disclosure relates to structural components. [Background technology]

[0002] 2. Description of the Related Art Structures such as automobile bodies are formed using structural parts, which are required to have durability against input loads.

[0003] For example, Patent Document 1 discloses a suspension arm for automobiles. The suspension arm in Patent Document 1 includes a plate-shaped main body and pipe-shaped reinforcing portions provided on both side edges of the main body. Patent Document 1 states that this structure increases the second moment of area about an axis that passes through the centroid of the main body and is perpendicular to the main body, thereby providing the suspension arm with sufficient rigidity to withstand bending loads.

[0004] For example, Patent Document 2 discloses a cross member for an automobile. The cross member in Patent Document 2 includes a web folded into a saddle shape, a pair of side walls provided on both side edges of the web, and flange portions provided at the tip of each side wall. In this cross member, the width of the web gradually increases from both longitudinal ends of the web toward the folded portion. Patent Document 2 states that by making the flange-side tips of the pair of side walls at both longitudinal ends of the web more open than the base ends of the web, it is possible to improve the side impact strength when the cross member is connected to a side member and used. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-188022 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-111377 Summary of the Invention [Problem to be solved by the invention]

[0006] Some structural parts, such as rear upper arms, which are one type of suspension arm for automobiles, include a curved region in side view. Such structural parts often have a closed cross-section structure. For example, a structural part with a closed cross-section structure called a "monaka structure" is formed by joining two concave members facing each other using arc welding. However, since rust is easily generated at arc welded joints, measures to prevent rusting are required. Furthermore, performing arc welding in the manufacturing process of a structural part may increase the manufacturing cost of the structural part.

[0007] When a structural component has an open cross-section structure without arc welds, rusting at the arc welds can be avoided and the manufacturing cost of the structural component can be reduced. However, simply making a structural component an open cross-section structure reduces the rigidity of the structural component, which results in a smaller reaction force of the structural component against an input load.

[0008] An object of the present disclosure is to provide a structural component that can exert a high reaction force against an input load despite having an open cross-section structure. [Means for solving the problem]

[0009] A structural component according to the present disclosure includes a top plate and two side walls. The two side walls are arranged to face each other. Each of the two side walls is continuous with the top plate. The structural component includes a curved region. When viewed from the side wall side, the curved region is curved with the top plate side being the inside of the curve and the opposite side of the top plate being the outside of the curve. In the curved region, the two side walls are connected by the top plate on the inside of the curve. The curved region is open on the outside of the curve. When the curved region is viewed in cross section, the ends of each of the two side walls that are located opposite the top plate are arranged inside the structural component with respect to the boundary between the side wall and the top plate. When the curved region is viewed in cross section, the sum of the lengths of the two side walls is greater than the length of the top plate. [Effects of the Invention]

[0010] Despite having an open cross-sectional structure, the structural component according to the present disclosure can exert a high reaction force against an input load. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view schematically showing a structural component according to a first embodiment. [Figure 2] FIG. 2 is a side view schematically showing the structural component according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view of the structural component shown in FIGS. [Figure 4] FIG. 4 is a cross-sectional view of a structural component according to the second embodiment. [Figure 5] FIG. 5 is a cross-sectional view of a structural component according to a modified example of the second embodiment. [Figure 6] FIG. 6 is a graph showing the relationship between the width reduction rate of the structural part and the reaction force at the time of a 20 mm stroke. [Figure 7] FIG. 7 is a graph showing the relationship between the width reduction rate of a structural part and the maximum reaction force. DETAILED DESCRIPTION OF THE INVENTION

[0012] A structural component according to an embodiment includes a top plate and two side walls. The two side walls are arranged to face each other. The two side walls are each continuous with the top plate. The structural component includes a curved region. When viewed from the side wall side, the curved region is curved with the top plate side being the inner side of the curve and the opposite side of the top plate being the outer side of the curve. In the curved region, the two side walls are connected by the top plate on the inner side of the curve. The curved region is open on the outer side of the curve. When the curved region is viewed in cross section, the ends of each of the two side walls that are located opposite the top plate are arranged inside the structural component with respect to the boundary between the side wall and the top plate. When the curved region is viewed in cross section, the sum of the lengths of the two side walls is greater than the length of the top plate (first configuration).

[0013] A structural component according to a first configuration includes a curved region that is curved when viewed from the side wall side of the structural component. The curved region has two side walls connected by a top plate on the inside of the curve, while the outside of the curve has an open cross-sectional structure. When a compressive load that compresses both ends of the structural component according to the first configuration is applied, compressive deformation occurs at the top plate on the inside of the curve and at the boundaries between the top plate and each side wall, and tensile deformation occurs at the ends of each side wall on the outside of the curve. At this time, the tensile deformation at the ends of each side wall acts as a driving force to cause contact between the side walls. More specifically, when tension is applied to the ends of the side walls in the longitudinal direction of the structural component, the side walls tilt, reducing the cross section of the structural component and facilitating deformation of the structural component. In the first configuration, when viewed in cross section of the curved region, the ends of the side walls are pre-positioned inside the structural component relative to the boundaries between the top plate and each side wall. Therefore, when tension is applied to the ends of the side walls in the longitudinal direction of the structural component, the ends of the side walls are more likely to move inside the structural component. When the ends of the side walls move inward, for example, they come into contact with each other, and a force pressing the side walls against each other acts in the curved region of the structural component. In this case, even after the reaction force of the structural component reaches its peak in response to the input compressive load, the decrease in the reaction force is likely to be suppressed. Therefore, the structural component can exert a high reaction force even in the later stages of deformation.

[0014] In this way, the structural component according to the first configuration can exert a high reaction force against an input load, despite having an open cross-sectional structure.

[0015] In a structural component according to the first configuration, when the curved region is viewed in cross section, the direction in which a straight line connecting the boundary between one of the two side walls and the top plate and the boundary between the other side wall and the top plate extends is defined as the width direction of the structural component, and the length of that straight line is defined as the width of the top plate. The widthwise distance from the end of one side wall to the end of the other side wall may be 99.5% or less of the width of the top plate (second configuration).

[0016] In the structural component according to the second configuration, the distance in the width direction from the end of one side wall to the end of the other side wall may be 85.0% or more of the width of the top plate (third configuration).

[0017] The structural component according to any one of the first to third configurations may further include a flange. The flange is continuous with at least one of the two side walls on the opposite side of the top plate. The flange protrudes from at least one of the side walls in a direction intersecting the side wall. It is preferable that the flange extends along the curved region, passing through the bottom of the curved region, on the outside of the curve (fourth configuration).

[0018] In the structural component according to the fourth configuration, a flange is provided on one or both ends of the two side walls at least at the bottom of the curved region, which increases the rigidity of the curved region of the structural component and therefore increases the peak of the reaction force against the compressive load.

[0019] In the structural component according to the fourth configuration, the flange may be provided on each of the two side walls (fifth configuration).

[0020] In the structural component according to any one of the first to fifth configurations, when the curved region is viewed in cross section, the two side walls may be provided symmetrically with respect to the center of the top plate (sixth configuration).

[0021] In a sixth configuration, two side walls are provided symmetrically with respect to the center of the top plate in the cross section of the curved region of the structural component, which makes it difficult for torsional deformation to occur in the curved region when a compressive load is applied to the structural component.

[0022] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or equivalent components are designated by the same reference numerals, and the same description will not be repeated.

[0023] [First embodiment] (Structural component configuration) FIG. 1 is a perspective view that schematically shows a structural component 100 according to a first embodiment. FIG. 2 is a side view that schematically shows the structural component 100. The structural component 100 is used, for example, in the body of an automobile. The structural component 100 may be, for example, a chassis component such as a suspension arm. In this embodiment, an example will be described in which the structural component 100 is an upper arm, which is a type of suspension arm.

[0024] 1 and 2, a structural component 100 includes a top plate 10 and side walls 21 and 22. As shown in FIG.

[0025] The top plate 10 extends substantially or approximately in the left-right direction of the vehicle when the structural component 100, which is an upper arm, is attached to the vehicle. Hereinafter, the direction in which the top plate 10 extends is referred to as the longitudinal direction of the structural component 100.

[0026] The side walls 21 and 22 are arranged to face each other. The side wall 21 is continuous with the top plate 10. The side wall 22 is continuous with the top plate 10 on the side opposite to the side wall 21. The side walls 21 and 22 extend in the longitudinal direction of the structural component 100 along the top plate 10.

[0027] The structural component 100 includes a curved region 30. When viewed from the side wall 21 side, the curved region 30 is curved with the top plate 10 side as the inner side of the curve and the opposite side of the top plate 10 as the outer side of the curve. When viewed from the side wall 22 side opposite the side wall 21, the curved region 30 is also curved with the top plate 10 side as the inner side of the curve and the opposite side of the top plate 10 as the outer side of the curve. In the curved region 30, the side walls 21 and 22 are connected by the top plate 10 on the inner side of the curve. On the other hand, the curved region 30 is open on the outer side of the curve. In other words, on the outer side of the curve of the curved region 30, the structural component 100 is divided, and the side wall 21 and the side wall 22 are separated.

[0028] When the structural component 100 is used in an automobile body as in this embodiment, the curved region 30 is curved, for example, concave downward when the structural component 100 is attached to the automobile. The curved region 30 extends in the longitudinal direction of the structural component 100 with a radius of curvature of 400 mm or less, for example. The curved region 30 may extend in the longitudinal direction of the structural component 100 with a radius of curvature of 200 mm or less. The curved region 30 preferably extends in the longitudinal direction of the structural component 100 with a radius of curvature of 150 mm or less. The radius of curvature of the curved region 30 is, for example, 20 mm or more, and preferably 50 mm or more. In this case, the radius of curvature is the radius of curvature of the inner side of the curved region 30.

[0029] Mounting portions 41, 42 are provided at both longitudinal ends of the structural component 100. The mounting portions 41, 42 are portions for attaching the structural component 100 to another component. The top plate 10 extends from the vicinity of one mounting portion 41 to the vicinity of the other mounting portion 42. The mounting portions 41, 42 may be, for example, burring portions formed on the side walls 21, 22. In this case, bushings 51, 52 are press-fitted into the mounting portions 41, 42, respectively. However, the form of the mounting portions 41, 42 is not limited to this.

[0030] 3 is a diagram showing a cross section (transverse section) of the structural component 100 taken along a plane perpendicular to the longitudinal direction thereof. Fig. 3 shows the cross section of the structural component 100 taken along line III-III in Fig. 2, i.e., the cross section of the structural component 100 at the position of the bottom 31 of the curved region 30.

[0031] Referring to FIG. 3, the tabletop 10 includes a tabletop main body 11 and ridge portions 121 and 122. The tabletop main body 11 has a substantially flat shape when viewed in a cross section of the structural component 100. The ridge portions 121 and 122 are provided continuously on both side edges of the tabletop main body 11. The ridge portion 121 is a corner portion between the tabletop main body 11 and one side wall 21. The ridge portion 122 is a corner portion between the tabletop main body 11 and the other side wall 22. The ridge portions 121 and 122 have, for example, a substantially arc shape when viewed in a cross section of the structural component 100.

[0032] The side walls 21, 22 are provided contiguous with the ridge portions 121, 122 of the tabletop 10, respectively. In the curved region 30, the ends 211, 221 of the side walls 21, 22 located on the opposite side of the tabletop 10 are open ends. That is, the structural component 100 has an open cross-sectional structure at least in the range of the curved region 30. The structural component 100 may also have an open cross-sectional structure over the entire or almost entire longitudinal direction. The open cross-sectional structure means that the end 211 of the side wall 21 and the end 221 of the side wall 22 are spaced apart, and the structural component 100 itself does not have a continuous structure on the end 211, 221 side.

[0033] When the curved region 30 is viewed in cross section, the ends 211, 221 of the side walls 21, 22 are located inside the structural component 100 with respect to the boundaries 212, 222 between the side walls 21, 22 and the top plate 10. When the direction in which a straight line connecting the boundaries 212, 222 extends is defined as the width direction of the structural component 100 in the cross section of the curved region 30, the ends 211, 221 of the side walls 21, 22 are located between the boundaries 212 and 222 in the width direction of the structural component 100.

[0034] In this embodiment, the side walls 21, 22 are each bent midway, so that the end portions 211, 221 are positioned more inward in the width direction of the structural component 100 than the boundary portions 212, 222. However, the method for positioning the end portions 211, 221 more inward in the width direction of the structural component 100 than the boundary portions 212, 222 is not limited to this. For example, the side walls 21, 22 may be inclined as a whole with respect to a direction perpendicular to the width direction in a cross-sectional view of the structural component 100, so that the end portions 211, 221 are positioned more inward in the width direction than the boundary portions 212, 222. Furthermore, for example, the side walls 21, 22 may be curved in a cross-sectional view of the structural component 100 so that the end portions 211, 221 are positioned more inward in the width direction of the structural component 100 than the boundary portions 212, 222.

[0035] The ends 211, 221 of the side walls 21, 22 are not folded back toward the top plate 10 relative to the other portions of the side walls 21, 22. That is, in a cross section of the curved region 30, the angle θ1 formed by the end 211 with respect to an imaginary line VL1 that passes through a boundary 212 between the top plate 10 and the side wall 21 and is perpendicular to the width direction of the structural component 100 is less than 90°. Similarly, in a cross section of the curved region 30, the angle θ2 formed by the end 221 with respect to an imaginary line VL2 that passes through a boundary 222 between the top plate 10 and the side wall 22 and is perpendicular to the width direction of the structural component 100 is less than 90°. The angles θ1, θ2 are preferably 30° or less. Each of the angles θ1, θ2 may be greater than 0°, but may be 5° or greater. When side wall 21 is curved in the cross-sectional view of curved region 30, angle θ1 is the angle between a tangent to the outer surface of side wall 21 at the tip of end 211 and imaginary line VL1. When side wall 22 is curved in the cross-sectional view of curved region 30, angle θ2 is the angle between a tangent to the outer surface of side wall 22 at the tip of end 221 and imaginary line VL2.

[0036] In a cross-sectional view of the curved region 30, the direction in which a straight line connecting a boundary 212 between the side wall 21 and the tabletop 10 and a boundary 222 between the side wall 22 and the tabletop 10 extends is defined as the width direction of the structural component 100, and the length of this straight line is defined as the width W0 of the tabletop 10. The linear distance L0 in the width direction from the end 211 of the side wall 21 to the end 221 of the side wall 22 is shorter than the width W0 of the tabletop 10. In other words, the width of the structural component 100 is smaller on the outer side of the curve of the curved region 30 than on the inner side of the curve. In the example of FIG. 3 , the width W0 of the tabletop 10 is the linear distance between the boundaries 212, 212 on the outer surface of the structural component 100, and the distance L0 between the ends 211, 221 of the side walls 21, 22 is the width direction distance between the ends 211, 221 on the outer surface of the structural component 100. The distance L0 between the ends 211, 221 of the side walls 21, 22 is shorter than the width W0 of the top plate 10 in the range of the curved region 30 that includes at least the bottom portion 31 (FIG. 2). The distance L0 between the ends 211, 221 may be shorter than the width W0 of the top plate 10 only in the curved region 30, or may be shorter than the width W0 over the entire or almost entire structural component 100.

[0037] The distance L0 between the ends 211, 221 of the side walls 21, 22 is, for example, 99.5% or less of the width W0 of the tabletop 10, and preferably 98.0% or less of the width W0 of the tabletop 10. The distance L0 between the ends 211, 221 of the side walls 21, 22 may be 85.0% or more of the width W0 of the tabletop 10. In other words, the width reduction rate of the structural component 100 in the curved region 30 is, for example, 0.5% or more, and preferably 2.0% or more. The width reduction rate may be 15.0% or less. In the cross section of the curved region 30, when the length in the width direction of the structural component 100 from the boundary 212 between the side wall 21 and the tabletop 10 to the end 211 is L1 and the length in the width direction of the structural component 100 from the boundary 222 between the side wall 22 and the tabletop 10 to the end 221 is L2, the width reduction rate (%) can be calculated by 100 × (L1 + L2) ÷ W0. The ratio (%) of the distance L0 between the ends 211, 221 of the side walls 21, 22 to the width W0 of the top plate 10 is a value obtained by subtracting the width reduction rate from 100.

[0038] In the cross-sectional view of the curved region 30, the total length (height) H1 of the side walls 21 and 22 is S H : H1+H2 is greater than the width W0 of the table top 10. The height H1 of the side wall 21 is the linear distance from the boundary 212 between the side wall 21 and the table top 10 to the end 211 in the cross section of the curved region 30. The height H2 of the side wall 22 is the linear distance from the boundary 222 between the side wall 22 and the table top 10 to the end 221 in the cross section of the curved region 30. The sum S of the heights H1 and H2 of the side walls 21 and 22 H The total height S of the heights H1 and H2 of the side walls 21 and 22 is preferably 200% or more, and more preferably 400% or more, of the width W0. H The sum S of the heights H1 and H2 of the side walls 21 and 22 is greater than the width W0 of the top plate 10 at least in the area where the width of the structural component 100 is smaller on the outer side of the curve than on the inner side of the curve. H may be larger than the width W0 of the tabletop 10 only in the curved region 30, or may be larger than the width W0 over the entire length of the tabletop 10.

[0039] In this embodiment, when the curved region 30 is viewed in cross section, the side walls 21 and 22 are provided symmetrically with respect to the center of the table top 10. More specifically, in the cross section of the curved region 30, the side walls 21 and 22 are provided symmetrically with respect to a width center line CL of the table top 10 that passes through the midpoint of a line connecting a boundary 212 of the side wall 21 with the table top 10 and a boundary 222 of the side wall 22 with the table top 10 and is perpendicular to the line. Therefore, the gap between the end 211 of the side wall 21 and the end 221 of the side wall 22 is also located on the width center line CL of the table top 10. It is preferable that the side walls 21 and 22 are symmetrical with respect to the center of the table top 10 over at least the entire length of the curved region 30.

[0040] (effect) The structural component 100 according to this embodiment includes a curved region 30 that is curved when viewed from the side walls 21 and 22. The curved region 30 has an open cross-sectional structure that opens on the outer side of the curve. In other words, in the curved region 30, the ends 211 and 221 of the side walls 21 and 22 are spaced apart. When a compressive load that compresses the area between the mounting portions 41 and 42 is applied to the structural component 100, compressive deformation occurs in the tabletop 10 on the inner side of the curve and in the boundary portions 212 and 222 between the tabletop 10 and the side walls 21 and 22, while tensile deformation occurs in the ends 211 and 221 of the side walls 21 and 22 on the outer side of the curve. At this time, the tensile deformation of the ends 211 and 221 acts as a driving force to deform the side walls 21 and 22 in directions that bring them closer to each other. More specifically, when tension is applied to the ends 211, 221 of the side walls 21, 22 in the extension direction thereof, the side walls 21, 22 tilt in a direction that reduces the cross section of the structural component 100 so as to facilitate deformation of the structural component 100. In this embodiment, in a cross-sectional view of the curved region 30, the ends 211, 221 of the side walls 21, 22 are pre-positioned on the inner side in the width direction of the structural component 100 compared to the boundary portions 212, 222 between the top plate 10 and the side walls 21, 22, making it easier for the ends 211, 221 to move inward in the width direction of the structural component 100. Therefore, when a compressive load is input to the structural component 100, the side walls 21, 22 tilt so that the ends 211, 221 move inward in the width direction of the structural component 100. If no inclusion exists between the end portions 211, 221, the end portions 211, 221 come into direct contact with each other, the cross section of the curved region 30 becomes a pseudo-closed cross section, and a force pressing against the side walls 21, 22 acts against them. If an inclusion exists between the end portions 211, 221, the end portions 211, 221 come into contact with the inclusion from both sides, and a force pressing against the side walls 21, 22 acts against them. This prevents the reaction force from decreasing even after the reaction force of the structural component 100 against the compressive load reaches its peak. Therefore, the structural component 100 can exert a high reaction force even in the later stages of deformation.

[0041] Thus, the structural component 100 according to this embodiment can exert a high reaction force against an input compressive load, despite having an open cross-sectional structure in which the end 211 of the side wall 21 and the end 221 of the side wall 22 are spaced apart in the width direction. In the structural component 100 according to this embodiment, the opening between the side walls 21 and 22 is not blocked. However, the opening between the side walls 21 and 22 may be blocked as long as a force can be applied that pushes the side walls 21 and 22 against each other when a compressive load is input to the structural component 100. For example, the side walls 21 and 22 may be connected by a component separate from the structural component 100.

[0042] In the structural component 100 according to this embodiment, the distance L0 between the ends 211, 221 of the side walls 21, 22 is, for example, 99.5% or less of the width W0 of the top plate 10, and preferably 98.0% or less. In this case, the structural component 100 is more likely to exert a high reaction force in the later stage of deformation. The distance L0 between the ends 211, 221 of the side walls 21, 22 is preferably 85.0% or more of the width W0 of the top plate 10. In this case, when a compressive load is input to the structural component 100, not only the reaction force in the later stage of deformation but also the peak reaction force can be increased.

[0043] In this embodiment, when the curved region 30 is viewed in cross section, the side walls 21 and 22 are provided symmetrically with respect to the center of the top plate 10. This suppresses the occurrence of torsional deformation in the curved region 30 when a compressive load is input to the structural component 100.

[0044] However, in the cross section of the curved region 30, the side walls 21, 22 do not necessarily have to be symmetrical with respect to the center of the table top 10. The end portions 211, 221 of the side walls 21, 22 need only be positioned inward in the width direction of the structural component 100 compared to the boundary portions 212, 222 with the table top 10 so that deformation can occur in which the end portions 211, 221 approach each other when a compressive load is input to the structural component 100.

[0045] [Second embodiment] 4 is a cross-sectional view of a structural component 200 according to the second embodiment. The structural component 200 according to this embodiment has basically the same configuration as the structural component 100 according to the first embodiment (FIGS. 1 to 3). However, the structural component 200 differs from the structural component 100 according to the first embodiment in that it includes flanges 61 and 62.

[0046] 4, the flange 61 is continuous with one of the side walls 21 on the opposite side of the top plate 10. That is, the flange 61 is provided continuous with the end portion 211 of the side wall 21. The flange 61 protrudes from the side wall 21 in a direction intersecting with the side wall 21. In this embodiment, the flange 61 protrudes from the end portion 211 of the side wall 21 toward the outside of the structural component 200.

[0047] The flange 62 is continuous with the other side wall 22 on the opposite side of the top plate 10. That is, the flange 62 is provided continuous with the end portion 221 of the side wall 22. The flange 62 protrudes from the side wall 22 in a direction intersecting with the side wall 22. In this embodiment, the flange 62 protrudes from the end portion 221 of the side wall 22 toward the outside of the structural component 200. The flange 62 protrudes toward the opposite side from the flange 61.

[0048] The flanges 61, 62 extend along the curved region 30, passing through the bottom 31 (FIG. 2), on the outside of the curve of the curved region 30. That is, the flanges 61, 62 extend along the ends 211, 221 of the side walls 21, 22 in an area that includes at least the bottom 31 of the curved region. The flanges 61, 62 may extend along the ends 211, 221 of the side walls 21, 22 over the entire length of the curved region 30. The flanges 61, 62 may extend along the ends 211, 221 of the side walls 21, 22, for example, up to the vicinity of the mounting portions 41, 42 (FIGS. 1 and 2).

[0049] In this embodiment, when the curved region 30 is viewed in cross section, the flanges 61, 62 are provided symmetrically with respect to the width center line CL of the table top 10. In the example of Fig. 4, the flanges 61, 62 are substantially parallel to the table top main body 11 in the cross section of the curved region 30. However, the flanges 61, 62 may be inclined with respect to the table top main body 11 in the cross section of the curved region 30.

[0050] The length (width) of the flanges 61, 62 in the width direction of the structural component 200 may be constant over the entire length of the flanges 61, 62, or may vary along the extension direction of the flanges 61, 62. For example, the width of the flanges 61, 62 may be larger at the bottom 31 of the curved region 30 (FIG. 2) than at both ends in the longitudinal direction of the structural component 200. In this case, it is preferable that the width of the flanges 61, 62 is greatest at the bottom 31 of the curved region 30. It is also preferable that the width of the flanges 61, 62 gradually decreases from the bottom 31 of the curved region 30 toward both ends in the longitudinal direction of the structural component 200. However, the width of the flanges 61, 62 may suddenly change at any position in the longitudinal direction of the structural component 200.

[0051] When the flange 61 is provided continuously with the side wall 21 as in the present embodiment, the lengths L0, L1 and height H1 related to the side wall 21 are measured by taking the end 211 of the side wall 21 as the radius limit of the corner between the side wall 21 and the flange 61 on the side wall 21 side. Similarly, when the flange 62 is provided continuously with the side wall 22, the lengths L0, L2 and height H2 related to the side wall 22 are measured by taking the end 221 of the side wall 22 as the radius limit of the corner between the side wall 22 and the flange 62 on the side wall 22 side. As in the first embodiment, the lengths L0, L1, L2 and heights H1, H2 related to the side walls 21 and 22, and the width W0 of the top plate are measured on the outer surface of the structural component 200.

[0052] Similarly to the first embodiment, when a compressive load is applied between the mounting portions 41 and 42, the structural component 200 according to this embodiment can exert a high reaction force even in the later stage of deformation by causing the end portions 211 and 221 of the side walls 21 and 22 to come into direct or indirect contact with each other, thereby applying a pressing force to the side walls 21 and 22. Furthermore, the structural component 200 is provided with flanges 61 and 62, which increases the rigidity of the structural component 200 against compressive loads. Therefore, despite having an open cross-section structure, the structural component 200 can exert a high peak reaction force when a compressive load is applied.

[0053] In this embodiment, when the curved region 30 is viewed in cross section, the flanges 61, 62 are provided symmetrically with respect to the center of the tabletop 10. This makes it difficult for torsional deformation to occur in the curved region 30 when a compressive load is input to the structural component 200. However, the flanges 61, 62 do not necessarily have to be provided symmetrically with respect to the center of the tabletop 10.

[0054] The structural component 200 according to this embodiment includes flanges 61, 62 that are continuous with the side walls 21, 22 on the opposite side of the top plate 10. However, the structural component 200 does not necessarily have to include either of the flanges 61, 62.

[0055] In this embodiment, the flanges 61, 62 protrude from the side walls 21, 22 toward the outside of the structural component 200. However, as shown in Figure 5, the flanges 61, 62 may also protrude from the side walls 21, 22 toward the inside of the structural component 200. Alternatively, one of the flanges 61, 62 may protrude toward the outside of the structural component 200, and the other of the flanges 61, 62 may protrude toward the inside of the structural component 200. When the structural component 200 includes only one of the flanges 61, 62, the flange may protrude toward either the outside or the inside of the structural component 200.

[0056] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure. [Example]

[0057] The present disclosure will be described in more detail below with reference to examples, although the present disclosure is not limited to the following examples.

[0058] To confirm the effects of the present disclosure, a numerical analysis was performed using commercially available structural analysis software (Abaqus, manufactured by Dassault Systèmes) on a structural component having the same shape as the structural component 100 according to the first embodiment (FIGS. 1 to 3). This analysis evaluated the reaction force when a compressive load was applied to the structural component to compress the attachment portions (between fastening points). More specifically, the reaction force at a later stage of deformation when the displacement stroke in the load direction was 20 mm (20 mm stroke) was evaluated. The maximum reaction force (peak reaction force) when the compressive load was applied was also evaluated. For comparison, a similar analysis was performed on a structural component having a conventional open cross-section structure.

[0059] FIG. 6 is a graph showing the results of this analysis. FIG. 6 illustrates the relationship between the width reduction rate (%) (100 × (L1 + L2) ÷ W0) described in the first embodiment and the reaction force (kN) at a stroke of 20 mm. As can be seen from FIG. 6, the structural component (Example) having an open cross-sectional structure in which the ends of both side walls are spaced apart and located widthwise inward relative to the boundary between the side wall and the top plate exhibited a larger reaction force at a stroke of 20 mm than the typical structural component (Comparative Example) having an open cross-sectional structure but with the ends of both side walls located at the same widthwise position as the boundary between the side wall and the top plate. More specifically, it was confirmed that the reaction force at a stroke of 20 mm was significantly greater in each of the Examples in which the width reduction rate in the curved region of the structural component was 0.5% or more than in the Comparative Example in which the width reduction rate was 0.0%. In particular, when the width reduction rate was 2.0% or more, the reaction force at a stroke of 20 mm was significantly greater than in the Comparative Example. Therefore, it can be said that the structural component according to the embodiment exerts a high reaction force in the later stage of deformation, despite having an open cross-sectional structure.

[0060] FIG. 7 is also a graph showing the results of this analysis. FIG. 7 shows the relationship between the width reduction rate (%): 100 × (L1 + L2) ÷ W0 and the maximum reaction force (kN). As shown in FIG. 7, for some examples, not only the reaction force at a stroke of 20 mm but also the maximum reaction force was greater than that of the comparative example. More specifically, when the width reduction rate was 15.0% or less, the maximum reaction force was greater than that of the comparative example in which the width reduction rate was 0.0%. Therefore, in order to increase the maximum reaction force as well as the reaction force in the later stage of deformation, it is preferable that the width reduction rate be 15.0% or less.

[0061] On the other hand, when a similar analysis was performed on a structural component with flanges on the ends of the side walls, such as the structural component 200 of the second embodiment, the maximum reaction force of this structural component increased by nearly 20% compared to the comparative example, even when the width reduction rate was 50%. Therefore, it was confirmed that a high maximum reaction force can be obtained by providing flanges on the side walls in a structural component with an open cross-sectional structure in which the ends of both side walls are located widthwise inward of the boundary between the side walls and the top plate. [Explanation of symbols]

[0062] 100, 200: Structural parts 10: Top plate 21,22: Side wall 211, 221: End 212, 222: Boundary 30: Curved area 31: Bottom 61,62: Flange

Claims

1. A structural component, The top plate and Two side walls arranged to face each other and each continuous with the top plate; Equipped with The structural component is curved, when viewed from the side wall side, with the top plate side being the inside of the curve and the opposite side of the top plate being the outside of the curve, and the two side walls are connected by the top plate on the inside of the curve and have an opening on the outside of the curve; Including, When the curved region is viewed in cross section, an end portion of each of the two side walls that is located on the opposite side of the top plate is disposed inside the structural component with respect to a boundary portion between the side wall and the top plate, and a sum of lengths of the two side walls is greater than a length of the top plate; A structural component, wherein in a cross section of the curved region, the angle that the end portion forms outside the structural component with respect to an imaginary line that passes through the boundary between the top plate and each of the two side walls and is perpendicular to the width direction of the structural component is less than 90°.

2. 2. The structural component of claim 1, When the curved region is viewed in cross section, the direction in which a straight line connecting the boundary between one of the two side walls and the top plate and the boundary between the other side wall and the top plate extends is defined as the width direction of the structural component, and the length of the straight line is defined as the width of the top plate, and the distance in the width direction from the end of one side wall to the end of the other side wall is 99.5% or less of the width of the top plate.

3. 3. A structural component according to claim 2, A structural component, wherein the distance is 85.0% or more of the width of the top plate.

4. 10. The structural component of claim 1, further comprising: a flange that is continuous with at least one of the two side walls on the opposite side of the top plate and that protrudes from the at least one side wall in a direction intersecting the side wall; Equipped with The flange extends along the curved region, through a bottom of the curved region, on the outside of the curve.

5. 5. A structural component according to claim 4, The flange is provided on each of the two side walls.

6. A structural component according to any one of claims 1 to 5, A structural component, wherein when the curved region is viewed in cross section, the two side walls are provided symmetrically with respect to the center of the top plate.

Images