Structural parts

Abstract

The structural component (100) includes a component body (10) and a reinforcing member (20). The component body (10) includes a top plate (11) and vertical walls (121, 122). The vertical walls (121, 122) are continuous with the top plate (11). The reinforcing member (20) is disposed between the vertical walls (121, 122). The component body (10) includes a curved portion (15). The curved portion (15) is curved with the top plate (11) side on the inner side of the curve when viewed from the vertical walls (121, 122) side. On the outer side of the curved portion (15), there is an open gap between the end (121a) of the vertical wall (121) and the end (122a) of the vertical wall (122). At least a portion of the reinforcing member (20) is disposed in the curved portion (15) and connects the vertical walls (121) and (122) to the ends (121a, 122b) of the vertical walls (121, 122) on the top plate (11) side.

Description

[Technical field]

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

[0002] For example, structures such as the body of an automobile are formed using structural parts, some of which are required to have strength (proof strength) and rigidity against external forces.

[0003] Patent Document 1 discloses a suspension arm for an automobile. Patent Document 1 exemplifies an upper arm as a type of suspension arm. The upper arm of Patent Document 1 is formed into a hollow shape by fitting a first arm member and a second arm member together. The first arm member and the second arm member each include a vertical wall that faces the mating arm member. The upper arm is a long member that is curved when viewed from the vertical wall side.

[0004] In the upper arm of Patent Document 1, the weld between the first arm member and the second arm member is located at a position away from the center of the cross section of the upper arm. According to Patent Document 1, this means that the weld is formed outside of the high stress area, reducing fatigue of the weld caused by external forces and making it less likely that the strength of the arm members will decrease.

[0005] In the upper arm of Patent Document 1, the vertical wall of one arm member is inclined relative to the vertical direction in a cross-sectional view of the upper arm in order to avoid interference between the upper arm and other members. However, the vertical wall of the other arm member is not inclined relative to the vertical direction in a cross-sectional view of the upper arm. Patent Document 1 states that this suppresses a decrease in the section modulus of the upper arm in the portion where the vertical wall of one arm member is inclined, thereby ensuring sufficient rigidity of the upper arm. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-162327 A Summary of the Invention [Problem to be solved by the invention]

[0007] Incidentally, when a compressive load that compresses both ends is applied to a structural component that is curved as viewed from the vertical wall side, such as the upper arm of Patent Document 1, out-of-plane deformation of each vertical wall occurs. More specifically, in a structural component having a completely closed cross-sectional structure (monaka structure) such as the upper arm of Patent Document 1, deformation occurs such that both vertical walls move away from each other toward the outside of the structural component, particularly in the curved portion. Similarly, in a structural component having an open cross-sectional structure that opens on the outside of the curve, when a compressive load that compresses both ends is applied, the vertical walls move away from each other in the curved portion. Deformation that causes the vertical walls to move away from each other in the structural component may reduce the strength against the compressive load.

[0008] An object of the present disclosure is to provide a structural component that can ensure resistance to compressive loads. [Means for solving the problem]

[0009] The structural component according to the present disclosure includes a component body and a reinforcing member. The component body includes a top plate, a first vertical wall, and a second vertical wall. The first vertical wall is continuous with the top plate. The second vertical wall is disposed on the opposite side of the first vertical wall with respect to the top plate and is continuous with the top plate. The reinforcing member is disposed between the first vertical wall and the second vertical wall. The component body includes a curved portion. The curved portion is curved with the top plate side as the curved inner side when viewed from the first vertical wall side or the second vertical wall side. On the curved outer side of the curved portion, a gap between the end of the first vertical wall and the end of the second vertical wall is open. At least a portion of the reinforcing member is disposed in the curved portion, and connects the first vertical wall and the second vertical wall on the top plate side with respect to the respective ends of the first vertical wall and the second vertical wall. Effect of the Invention

[0010] According to the structural component according to the present disclosure, it is possible to ensure resistance to compressive loads. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view that illustrates a structural component according to an embodiment. [Diagram 2] FIG. 2 is a side view of the structural component shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Diagram 5] FIG. 5 is a diagram showing an example of a reinforcing member included in the structural component shown in FIG. [Figure 6] FIG. 6 is a diagram showing another example of a reinforcing member included in the structural component shown in FIG. [Figure 7] FIG. 7 is a diagram showing still another example of a reinforcing member included in the structural component shown in FIG. [Figure 8] FIG. 8 is a diagram showing still another example of the reinforcing member included in the structural component shown in FIG. [Figure 9] FIG. 9 is a side view of a structural component according to a modified example of the above embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a structural component according to another modified example of the above embodiment. [Figure 11] FIG. 11 is a cross-sectional view of a structural component according to still another modified example of the above embodiment. [Figure 12] FIG. 12 is a graph showing the results of the analysis carried out as the first embodiment. [Figure 13] FIG. 13 is a graph showing the results of the analysis carried out as the second embodiment. [Figure 14] FIG. 14 is a graph showing the results of the analysis carried out as the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A structural component according to an embodiment includes a component body and a reinforcing member. The component body includes a top plate, a first vertical wall, and a second vertical wall. The first vertical wall is continuous with the top plate. The second vertical wall is disposed on the opposite side of the top plate from the first vertical wall and is continuous with the top plate. The reinforcing member is disposed between the first vertical wall and the second vertical wall. The component body includes a curved portion. The curved portion is curved with the top plate side on the inner side of the curve when viewed from the first vertical wall side or the second vertical wall side. On the outer side of the curved portion, a gap between an end of the first vertical wall and an end of the second vertical wall is open. At least a part of the reinforcing member is disposed in the curved portion, and connects the first vertical wall and the second vertical wall on the top plate side with respect to the ends of the first vertical wall and the second vertical wall (first configuration).

[0013] In the structural component according to the first configuration, the component body includes a curved portion that curves with the top plate side as the inside of the curve. In the curved portion, the first vertical wall and the second vertical wall of the component body are connected by a reinforcing member. More specifically, the reinforcing member connects the vertical walls to each other on the top plate side of the ends of these vertical walls. This reinforcing member can suppress the separation of the vertical walls in the curved portion when a compressive load that compresses the structural component between both ends is applied. Therefore, the cross-sectional shape of the structural component is easily maintained, and a decrease in the reaction force of the structural component against the compressive load is suppressed. Therefore, the structural component according to the first configuration can ensure the strength against the compressive load.

[0014] In the structural component according to the first configuration, the reinforcing member may include at least one opening, which penetrates the reinforcing member from the top plate side to each end side of the first vertical wall and the second vertical wall (second configuration).

[0015] According to the second configuration, at least one opening is provided in the reinforcing member. This allows the weight of the reinforcing member and the structural component including the reinforcing member to be reduced. Therefore, the strength of the structural component against a compressive load can be increased with weight efficiency.

[0016] In a structural component relating to the first or second configuration, in the cross section of the curved portion, when the distance from the top plate to the reinforcing member is L and the distance from the boundary between the top plate and the first vertical wall to the boundary between the top plate and the second vertical wall is W, it is preferable that L / W≦0.75 (third configuration).

[0017] In the third configuration, in the curved portion, the distance L from the top plate of the component body to the reinforcing member and the distance W from the boundary between the top plate and the first vertical wall to the boundary between the top plate and the second vertical wall satisfy L / W≦0.75. In this case, the strength of the structural component against compressive loads is more easily ensured.

[0018] In the structural component according to any one of the first to third configurations, the reinforcing member may extend to both ends of the component body through the bottom of the curved portion. In this case, the distance from the top plate to the reinforcing member at the bottom may be equal to or less than the distance from the top plate to the reinforcing member at the end face in the extending direction of the reinforcing member (fourth configuration).

[0019] In the fourth configuration, the distance from the top plate of the component body to the reinforcing member is small at the bottom of the curved portion and is equal to or smaller than the distance at the end face of the reinforcing member in the extending direction. In this case, at the bottom of the curved portion, the first vertical wall and the second vertical wall can be connected by the reinforcing member relatively closer to the top plate. Therefore, when a compressive load is input to the structural component, separation between the vertical walls in the curved portion is easily suppressed.

[0020] In the structural component according to any one of the first to fourth configurations, the first vertical wall may be symmetrical with the second vertical wall about the center of the top plate in a cross section of the curved portion (fifth configuration).

[0021] In the fifth configuration, the first vertical wall and the second vertical wall are provided symmetrically with respect to the center of the top plate in the cross section of the curved portion of the component body. In this case, when a compressive load is input to the structural component, torsional deformation is unlikely to occur in the curved portion.

[0022] In the structural component according to any one of the first to fifth configurations, the component body may be formed of a steel plate having a tensile strength of 590 MPa or more (sixth configuration).

[0023] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same reference numerals, and the same description will not be repeated.

[0024] [Structural component configuration] FIG. 1 is a perspective view that shows a structural component 100 according to this embodiment. FIG. 2 is a side view of 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 link component included in the suspension of the automobile. In this embodiment, an example will be described in which the structural component 100 is an upper arm, which is a type of link component.

[0025] 1 and 2, a structural component 100 includes a component body 10 and a reinforcing member 20. The component body 10 and the reinforcing member 20 are typically formed of metal plates. The component body 10 and the reinforcing member 20 may be formed of steel plates. Alternatively, the component body 10 and the reinforcing member 20 may be formed of a material other than steel, such as an aluminum alloy material. The plate thickness of the reinforcing member 20 may be equal to or greater than the plate thickness of the component body 10, but may be less than the plate thickness of the component body 10. The plate thickness of the component body 10 is, for example, 2.0 mm or more. The plate thickness of the component body 10 may be 6.0 mm or less. The plate thickness of the reinforcing member 20 is, for example, 1.0 mm or more. The plate thickness of the reinforcing member 20 may be 6.0 mm or less.

[0026] The component body 10 includes a top plate 11 and vertical walls 121, 122. The top plate 11 extends substantially or approximately in the left-right direction of the automobile when the structural component 100, which is an upper arm, is attached to the automobile. Hereinafter, the direction in which the top plate 11 extends is referred to as the longitudinal direction of the structural component 100.

[0027] The vertical walls 121 and 122 are each provided continuously with the top plate 11. The vertical wall 122 is disposed on the opposite side of the top plate 11 to the vertical wall 121. The vertical walls 121 and 122 extend along the top plate 11 in the longitudinal direction of the structural component 100.

[0028] Mounting portions 131, 132 are provided at both ends of the vertical walls 121, 122. The mounting portions 131, 132 are portions for mounting other components to the structural component 100. The mounting portions 131, 132 may be, for example, burring portions formed on the vertical walls 121, 122. In this case, bushings 141, 142 are press-fitted into the mounting portions 131, 132, respectively. However, the form of the mounting portions 131, 132 is not limited to this.

[0029] The component body 10 includes a curved portion 15. When viewed from the vertical wall 121 side, the curved portion 15 is curved with the top plate 11 side on the inside. When viewed from the vertical wall 122 side opposite the vertical wall 121, the curved portion 15 is also curved with the top plate 11 side on the inside.

[0030] When the structural component 100 is used in the body of an automobile as in this embodiment, the curved portion 15 is curved, for example, so as to be concave downward when the structural component 100 is attached to the automobile. The curved portion 15 extends in the longitudinal direction of the structural component 100 with a radius of curvature of 400 mm or less. The curved portion 15 may extend in the longitudinal direction of the structural component 100 with a radius of curvature of 200 mm or less. It is preferable that the curved portion 15 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 portion 15 is, for example, 20 mm or more, preferably 50 mm or more. The radius of curvature at this time is the radius of curvature of the curved inner side of the curved portion 15. More specifically, the radius of curvature of the curved portion 15 is measured on the boundary line between the top plate 11 and the vertical wall 121. The radius of curvature of the curved portion 15 may be constant throughout the entire curved portion 15, or may vary along the extension direction of the curved portion 15.

[0031] The curved portion 15 includes a bottom portion 151. The bottom portion 151 is a portion that passes through the curved apex in the curved portion 15 and extends with a constant radius of curvature. Fig. 3 shows a cross section (transverse section) of the structural component 100 cut by a plane along the normal direction of the curved portion 15 at the center position in the extension direction of the bottom portion 151.

[0032] 3, in the component body 10, the top plate 11 includes a top plate main body 111 and ridge portions 112a and 112b. The top plate main body 111 has a substantially flat shape when viewed in a cross section of the structural component 100. The ridge portions 112a and 112b are provided continuously with the top plate main body 111. The ridge portion 112a connects the top plate main body 111 to the vertical wall 121. The ridge portion 112b connects the top plate main body 111 to the vertical wall 122. The ridge portions 112a and 112b are corner portions between the vertical walls 121 and 122 and the top plate main body 111, respectively. The ridge portions 112a and 112b may have a substantially arc shape when viewed in a cross section of the structural component 100.

[0033] On the inside of the curved portion 15, the vertical walls 121 and 122 are connected by the top plate 11. On the other hand, on the outside of the curved portion 15, the space between the end 121a of the vertical wall 121 and the end 122a of the vertical wall 122 is open. That is, the component body 10 alone has an open cross-sectional structure in which the side opposite the top plate 11 is open.

[0034] In the cross section of the curved portion 15, the vertical walls 121 and 122 are provided symmetrically with respect to the center of the tabletop 11. More specifically, in the cross section of the curved portion 15, when a line passing through the midpoint of a line connecting the plate thickness center of the boundary between the tabletop 11 and the vertical wall 121 and the plate thickness center of the boundary between the tabletop 11 and the vertical wall 122 and perpendicular to the line is defined as a width center line CL of the tabletop 11, the vertical walls 121 and 122 are provided symmetrically with respect to the width center line CL. It is preferable that the vertical walls 121 and 122 are symmetric with respect to the center of the tabletop 11 at least in the curved portion 15. The vertical walls 121 and 122 may be symmetric with respect to the center of the tabletop 11 over the entire length in the longitudinal direction.

[0035] At least a part of the reinforcing member 20 is disposed in the curved portion 15. The reinforcing member 20 is disposed between the vertical walls 121, 122 of the component body 10. The reinforcing member 20 connects the vertical walls 121, 122 to the ends 121a, 122a of the vertical walls 121, 122 on the top plate 11 side. That is, the reinforcing member 20 is joined to the vertical walls 121, 122 at a position spaced away from the ends 121a, 122a toward the top plate 11. The reinforcing member 20 may be joined to the vertical walls 121, 122 at a position closer to the top plate 11 than the ends 121a, 122a. In other words, the distance from the reinforcing member 20 to the top plate 11 may be smaller than the distance from the reinforcing member 20 to the ends 121a, 122a of the vertical walls 121, 122. The reinforcing member 20 is joined to the vertical walls 121, 122 by, for example, welding. The reinforcing member 20 may be joined to the vertical walls 121, 122 by arc welding, laser welding, spot welding, or the like. Alternatively, the reinforcing member 20 may be joined to the vertical walls 121, 122 by adhesive or mechanical joining using bolts, rivets, or the like.

[0036] The reinforcing member 20 faces the top plate 11 with a gap therebetween. The reinforcing member 20, the vertical walls 121, 122, and the top plate 11 form a partially closed cross section in the structural component 100. The reinforcing member 20 may be parallel to the main body 111 of the top plate 11 in a cross-sectional view of the structural component 100, or may be inclined with respect to the top plate main body 111. In the cross-section of the curved portion 15, when the distance from the top plate 11 to the reinforcing member 20 is L and the width of the top plate 11 is W, it is preferable that L and W satisfy L / W≦0.75. More preferably, L / W≦0.50. It is preferable that L and W satisfy L / W≧0.10.

[0037] The distance L from the table top 11 to the reinforcing member 20 is the distance from the center of the thickness of the table top main body 111 to the center of the thickness of the reinforcing member 20 in the cross section of the curved portion 15, and is the distance along the thickness direction of the table top main body 111. For example, when the thickness of the table top main body 111 is t1 and the thickness of the reinforcing member 20 is t2, the distance L from the table top main body 111 to the reinforcing member 20 is greater than t1 / 2+t2 / 2. The distance L from the table top main body 111 to the reinforcing member 20 can be determined as appropriate.

[0038] The width W of the table top 11 is the straight-line distance from the center of the plate thickness at the boundary between the table top 11 and the vertical wall 121 (where the outer R of the ridge line 112a ends) to the center of the plate thickness at the boundary between the table top 11 and the vertical wall 122 (where the outer R of the ridge line 112b ends) in the cross section of the curved portion 15. The width W of the table top 11 can also be determined appropriately.

[0039] It is preferable that the distance L from the top plate 11 to the reinforcing member 20 and the width W of the top plate 11 satisfy L / W≦0.75 at least in the center in the extension direction of the bottom 151 (FIG. 2) of the curved portion 15. More preferably, L / W≦0.75 is satisfied over the entire bottom 151 of the curved portion 15. Even more preferably, L / W≦0.75 is satisfied over the entire curved portion 15. It is more preferable that L and W satisfy L / W≦0.50 at least in the center in the extension direction of the bottom 151 of the curved portion 15. L and W may satisfy L / W≧0.10 at least in the center in the extension direction of the bottom 151 of the curved portion 15.

[0040] 1 and 2, the reinforcing member 20 is preferably provided at least at the bottom 151 of the curved portion 15. The reinforcing member 20 can pass through the bottom 151 of the curved portion 15 and extend to both ends of the component body 10 in the longitudinal direction. The reinforcing member 20 may extend over the entire curved portion 15, or may extend beyond the curved portion 15. The extension length of the reinforcing member 20 may be equal to or less than the extension length of the curved portion 15, or may be greater than the extension length of the curved portion 15.

[0041] The extension length of the curved portion 15 is the circumferential length between the inflection points at both ends of the curved portion 15 (the line length of the boundary line between the table top 11 and the vertical wall 121). When the curved portion 15 is adjacent to a flat portion, the extension length of the curved portion 15 is the circumferential length from the boundary between the curved portion 15 and the flat portion to the inflection point on the opposite side of this boundary or to the boundary between the curved portion 15 and another flat portion. The flat portion refers to a portion that extends at a radius of curvature greater than 400 mm at the boundary line between the table top 11 and the vertical wall 121. The extension length of the reinforcing member 20 is the length along the reinforcing member 20 when viewed from the vertical wall 121 side.

[0042] 4 is a cross-sectional view of the structural component 100 at the end position of the reinforcing member 20 in the extension direction (a cross-section along the perpendicular or normal direction of the boundary line between the top plate 11 and the vertical walls 121, 122 in a side view). When the reinforcing member 20 passes through the bottom 151 of the curved portion 15 and extends to both ends of the component body 10 in the longitudinal direction (FIGS. 1 and 2), the distance L0 from the top plate 11 to the reinforcing member 20 at the end face in the extension direction of the reinforcing member 20 is, for example, equal to or greater than the distance L (FIG. 3) from the top plate 11 to the reinforcing member 20 at the bottom 151 of the curved portion 15. It is preferable that the distance L0 is greater than the distance L. The distance L0 is the distance from the thickness center of the top plate main body 111 to the thickness center of the end face in the extension direction of the reinforcing member 20, and is the distance along the thickness direction of the top plate main body 111.

[0043] 5 to 8 are views of the structural component 100 viewed from the reinforcing member 20 side, showing examples of the reinforcing member 20 having different shapes. As shown in FIG. 5, the reinforcing member 20 can have, for example, a solid plate shape throughout. Alternatively, as shown in FIGS. 6 and 7, the reinforcing member 20 may include at least one opening 21. The opening 21 penetrates the reinforcing member 20 from the top plate 11 side to the end portions 121a and 122a of the vertical walls 121 and 122. The opening 21 is, for example, a lightening hole provided in the reinforcing member 20. In the example of FIGS. 6 and 7, the reinforcing member 20 includes a plurality of openings 21. The plurality of openings 21 are arranged in the longitudinal direction of the structural component 100. The shape of the opening 21 is not particularly limited. When the structural component 100 is viewed from the reinforcing member 20 side, the opening 21 may have a rectangular shape as shown in FIG. 6, or may have another polygonal shape. When the structural component 100 is viewed from the reinforcing member 20 side, the opening 21 may have a circular shape, an oval shape, an elliptical shape, or the like as shown in FIG.

[0044] As shown in FIG. 8, the reinforcing member 20 may be provided intermittently along the longitudinal direction of the structural component 100. That is, the reinforcing member 20 may include a plurality of divided portions 22. The plurality of divided portions 22 are arranged at intervals from one end side to the other end side of the longitudinal direction of the component body 10. In this case, the distance along the arrangement direction of the divided portions 22 from the divided portion 22 closest to one end of the longitudinal direction of the component body 10 to the divided portion 22 closest to the other end of the longitudinal direction of the component body 10 is the extension length of the reinforcing member 20. In this case, too, the extension length of the reinforcing member 20 may be equal to or less than the extension length of the curved portion 15, or may be greater than the extension length of the curved portion 15.

[0045] The component body 10 and the reinforcing member 20 of the structural member 100 can be manufactured, for example, by press molding of steel plates. The component body 10 may be formed of a steel plate having a tensile strength of 590 MPa or more. The component body 10 may be formed of a steel plate having a tensile strength of 780 MPa or more, a steel plate having a tensile strength of 980 MPa or more, or a steel plate having a tensile strength of 1180 MPa or more. The tensile strength of the component body 10 can be measured, for example, by performing a tensile test in accordance with JIS Z 2241:2022 on a test piece taken from the top plate body 111. The tensile strength of the reinforcing member 20 may be the same as or different from the tensile strength of the component body 10.

[0046] However, the component body 10 and the reinforcing member 20 do not necessarily have to be formed from steel plates. The component body 10 and the reinforcing member 20 may be manufactured, for example, by preparing an aluminum alloy extrusion material having a predetermined cross-sectional shape and subjecting this extrusion material to hot bending or hot forging.

[0047] [effect] In the structural component 100 according to this embodiment, the component body 10 includes a curved portion 15 that curves with the top plate 11 side as the inside of the curve. The curved portion 15 is reinforced by a reinforcing member 20. More specifically, in the curved portion 15 of the component body 10, the vertical walls 121, 122 are connected to the ends 121a, 122a of the vertical walls 121, 122 on the top plate 11 side by the reinforcing member 20. As a result, when a compressive load that compresses the mounting portions 131, 132 is applied to the structural component 100, the reinforcing member 20 suppresses the separation of the vertical walls 121, 122 in the curved portion 15. Therefore, the cross-sectional shape of the structural component 100 is easily maintained, and a decrease in the reaction force of the structural component 100 against the compressive load is suppressed. Therefore, the strength of the structural component 100 against the compressive load can be ensured.

[0048] In this embodiment, the reinforcing member 20 may include at least one opening 21. This allows the weight of the reinforcing member 20 and the structural component 100 to be reduced. Therefore, the strength of the structural component 100 against a compressive load can be increased with more weight efficiency.

[0049] In the structural component 100 according to this embodiment, it is preferable that the distance L from the top plate 11 to the reinforcing member 20 and the width W of the top plate 11 satisfy L / W≦0.75 at the curved portion 15 of the component body 10. In this case, the strength of the structural component 100 against a compressive load is more easily ensured.

[0050] In this embodiment, the reinforcing member 20 can pass through the bottom 151 of the curved portion 15 and extend to both ends of the component body 10 in the longitudinal direction. In this case, the ratio L / L0 of the distance L from the top plate 11 to the reinforcing member 20 at the center position of the bottom 151 of the curved portion 15 to the distance L0 from the top plate 11 to the reinforcing member 20 at the end face in the extension direction of the reinforcing member 20 is preferably 1.0 or less. More preferably, L / L0 is less than 1.0. In other words, at the position of the bottom 151 of the curved portion 15, it is more preferable that the reinforcing member 20 is disposed relatively closer to the top plate 11 with respect to the height of the vertical walls 121, 122.

[0051] When a compressive load is input to the structural component 100, deformation in which the vertical walls 121, 122 move away from each other is likely to occur particularly at the bottom 151 of the curved portion 15. However, by connecting the vertical walls 121, 122 with the reinforcing member 20 at a position near the top plate 11 at the bottom 151 of the curved portion 15, it is possible to effectively prevent the vertical walls 121, 122 from moving away from each other when the structural component 100 is subjected to compressive deformation.

[0052] In this embodiment, the reinforcing member 20 may extend substantially parallel to the top plate 11 from one end side to the other end side of the component body 10, or may extend non-parallel to the top plate 11. For example, the reinforcing member 20 may extend with a curvature smaller than the curvature of the curved portion 15 in the component body 10. As shown in FIG. 9, the reinforcing member 20 may have a substantially linear shape (curvature 0) when viewed from the vertical wall 121 or vertical wall 122 side. When the curvature of the reinforcing member 20 is small, the manufacturing of the reinforcing member 20 becomes easier. When the curvature of the reinforcing member 20 is smaller than the curvature of the curved portion 15, the distance L from the top plate 11 to the reinforcing member 20 at the position of the bottom 151 of the curved portion 15 becomes smaller than the distance L0 from the top plate 11 to the reinforcing member 20 at the end face in the extension direction of the reinforcing member 20. Regardless of whether the reinforcing member 20 and the top plate 11 of the component body 10 are parallel or not, the reinforcing member 20 may be provided within the range of the curved portion 15 or may extend beyond the curved portion 15.

[0053] In this embodiment, in the cross section of the curved portion 15, the vertical walls 121, 122 are provided symmetrically with respect to the center of the table top 11. This suppresses the occurrence of torsional deformation in the curved portion 15 when a compressive load is input to the structural component 100. However, in the cross section of the curved portion 15, the vertical walls 121, 122 do not necessarily have to be symmetrical with respect to the center of the table top 11.

[0054] 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.

[0055] In the above embodiment, the reinforcing member 20 has a substantially straight shape in a cross-sectional view of the structural component 100. However, as shown in Figs. 10 and 11, the reinforcing member 20 may be bent so that both ends thereof are aligned with the vertical walls 121, 122 of the component body 10 in a cross-sectional view of the structural component 100. Both ends of the reinforcing member 20 may be bent toward the top plate 11 as shown in Fig. 10, or may be bent toward the opposite side of the top plate 11 as shown in Fig. 11. This allows both ends of the reinforcing member 20 to be used as welding allowances, for example, when welding the reinforcing member 20 to the vertical walls 121, 122. However, the method of joining the reinforcing member 20 to the vertical walls 121, 122 is not particularly limited.

[0056] The structural component 100 according to the above embodiment is provided with one reinforcing member 20. However, in the structural component 100, a plurality of reinforcing members 20 connecting the vertical walls 121, 122 of the component body 10 may be provided.

[0057] In the above embodiment, the ends 121a, 122a of the vertical walls 121, 122 of the component body 10 are free ends. However, flanges may be provided on the ends 121a, 122a of the vertical walls 121, 122. The flanges protrude from the ends 121a, 122a of the vertical walls 121, 122 toward the outside or inside of the component body 10. EXAMPLES

[0058] 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.

[0059] [First Example] In order to confirm the effect of the present disclosure, a numerical analysis was performed on the structural component 100 having the shape described in the above embodiment using commercially available structural analysis software (Abaqus, manufactured by Dassault Systèmes). In this analysis, the maximum reaction force (proof strength) was evaluated when a compressive load was input to the structural component 100 to compress the mounting parts 131, 132 (between fastening points) while changing the ratio of the extension length of the reinforcing member 20 to the extension length of the curved part 15 of the component body 10. In this analysis, the conditions other than the ratio of the extension length of the reinforcing member 20 to the extension length of the curved part 15 of the component body 10 were the same. In addition, in this analysis, the material of the component body 10 was a steel plate with a tensile strength of 980 MPa. For comparison, a similar analysis was performed on a structural component with a normal open cross-section structure without the reinforcing member 20 (Comparative Example 1) and a structural component with a normal closed cross-section structure (Monaca structure) (Comparative Example 2).

[0060] Fig. 12 is a graph showing the results of this analysis. Fig. 12 shows the relationship between the ratio (14%, 100%, and 220%) of the extension length of the reinforcing member 20 to the extension length of the curved portion 15 of the component body 10 and the maximum reaction force per unit weight against a compressive load. In the example where the ratio of the extension length of the reinforcing member 20 to the extension length of the curved portion 15 of the component body 10 is 220%, the reinforcing member 20 is disposed over substantially the entire length of the component body 10.

[0061] 12, in all cases where the ratio of the extension length of the reinforcing member 20 to the extension length of the curved portion 15 of the component body 10 was 14%, 100%, and 220%, the maximum reaction force per unit weight was greater than those of Comparative Examples 1 and 2. In particular, when the ratio of the extension length of the reinforcing member 20 to the extension length of the curved portion 15 of the component body 10 was 100% or less, the maximum reaction force per unit weight was significantly greater than those of Comparative Examples 1 and 2.

[0062] This analysis confirmed that in the curved portion 15, by connecting the vertical walls 121, 122 on the top board 11 side to the ends 121a, 122a with the reinforcing member 20, the resistance to compressive load is improved when evaluated in terms of weight equivalent. In particular, it was confirmed that when the reinforcing member 20 is provided within the range of the curved portion 15 without exceeding the curved portion 15, the resistance to compressive load is improved in a weight-efficient manner.

[0063] [Second Example] For a structural component 100 having the shape described in the above embodiment, an analysis similar to that in the first example was carried out while changing the ratio L / W of the distance L from the top plate 11 to the reinforcing member 20 at the center position of the bottom 151 of the curved portion 15 to the width W of the top plate 11. In this analysis, all conditions other than L / W were kept the same. The ratio of the extension length of the reinforcing member 20 to the extension length of the curved portion 15 of the component body 10 was standardized at 220%.

[0064] Fig. 13 is a graph showing the results of this analysis. Fig. 13 shows the relationship between L / W and the maximum reaction force per unit weight against the compressive load. Fig. 13 also shows the maximum reaction force per unit weight against the compressive load for the above-mentioned Comparative Example 1 and Comparative Example 2.

[0065] 13, when L / W was 0.75 or less, the maximum reaction force per unit weight was greater than those of Comparative Examples 1 and 2. In particular, when L / W was 0.50 or less, the maximum reaction force per unit weight was significantly greater than those of Comparative Examples 1 and 2.

[0066] Therefore, it is preferable that the distance L from the top plate 11 to the reinforcing member 20 and the width W of the top plate 11 at the bottom 151 of the curved portion 15 satisfy L / W≦0.75, and more preferably L / W≦0.50. From the results of this analysis, it can be said that the smaller the L / W, the higher the resistance to compressive load.

[0067] [Third Example] In the structural component 100 having the shape described in the above embodiment, the same analysis as in the first embodiment was performed for each of the cases where the thickness t2 of the reinforcing member 20 is equal to the thickness t1 of the component body 10 (t1=t2=2.9 mm) and where the thickness t2 of the reinforcing member 20 is smaller than the thickness t1 of the component body 10 (t1=2.9 mm, t2=1.0 mm). In addition, the same analysis as in the first embodiment was performed for the case where the thickness t2 of the reinforcing member 20 is smaller than the thickness t1 of the component body 10 (t1=2.9 mm, t2=1.0 mm) and multiple openings 21 are provided in the reinforcing member 20. In this analysis, the conditions other than the thickness t2 and openings 21 of the reinforcing member 20 were the same. The ratio of the extension length of the reinforcing member 20 to the extension length of the curved portion 15 of the component body 10 was unified at 220%, and L / W was unified at 0.75.

[0068] FIG. 14 is a graph showing the results of this analysis. As shown in FIG. 14, the maximum reaction force per unit weight was improved when the plate thickness t2 of the reinforcing member 20 was smaller than the plate thickness t1 of the component body 10 (t1=2.9 mm, t2=1.0 mm) and the reinforcing member 20 did not have the opening 21 as a lightening hole, compared to when the plate thickness t2 of the reinforcing member 20 was equal to the plate thickness t1 of the component body 10 (t1=t2=2.9 mm). Even when the plate thickness t2 of the reinforcing member 20 was smaller than the plate thickness t1 of the component body 10 and the opening 21 was present in the reinforcing member 20, the maximum reaction force per unit weight was improved compared to when the plate thickness t2 of the reinforcing member 20 was equal to the plate thickness t1 of the component body 10. Therefore, in order to increase the resistance to the compressive load with more weight efficiency, it can be said that it is preferable that the plate thickness t2 of the reinforcing member 20 is less than the plate thickness t1 of the component body 10. In addition, by providing the opening 21 in the reinforcing member 20, the resistance to the compressive load can be increased with more weight efficiency. [Explanation of symbols]

[0069] 100: Structural parts 10: Part body 11: Tabletop 121, 122: Vertical wall 121a, 122a: End 15: Curved section 151: Bottom 20: Reinforcement member 21: Opening

Claims

1. A structural part, a component body including a top plate, a first vertical wall continuous with the top plate, and a second vertical wall disposed on the opposite side of the top plate from the first vertical wall and continuous with the top plate; A reinforcing member disposed between the first vertical wall and the second vertical wall; Equipped with The component body includes a curved portion that is curved with the top plate side as viewed from the first vertical wall side or the second vertical wall side, and is curved on the curved outer side such that a portion between an end of the first vertical wall and an end of the second vertical wall is open, At least a portion of the reinforcing member is disposed in the curved portion, and connects the first vertical wall and the second vertical wall to the top plate side with respect to the end portions of the first vertical wall and the second vertical wall, The reinforcing member passes through a bottom of the curved portion and extends to both end sides of the component main body, A structural component, wherein the distance from the top plate to the reinforcing member at the bottom is equal to or less than the distance from the top plate to the reinforcing member at an end face in an extension direction of the reinforcing member.

2. 2. A structural component according to claim 1, A structural component, wherein the reinforcing member includes at least one opening penetrating the reinforcing member from the top plate side to the end sides of each of the first vertical wall and the second vertical wall.

3. 2. A structural component according to claim 1, A structural component, in which, in a cross section of the curved portion, when the distance from the top plate to the reinforcing member is L and the distance from the boundary between the top plate and the first vertical wall to the boundary between the top plate and the second vertical wall is W, L / W≦0.

75.

4. 2. A structural component according to claim 1, A structural component, wherein in a cross section of the curved portion, the first vertical wall is symmetrical with the second vertical wall with respect to a center of the top plate.

5. A structural component according to any one of claims 1 to 4, A structural component, wherein the component body is formed from a steel plate having a tensile strength of 590 MPa or more.

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