Closed cross-section structure

Abstract

To provide a closed cross-section structure capable of obtaining a closed cross-section having high strength without requiring extremely high manufacturing accuracy.SOLUTION: The closed cross-section structure includes a first member and a second member. The first member has a first supporting part and a first supported part on one edge which is one edge. The second member has a second supporting part and a second supported part on a second edge which is one edge. The second member forms a closed cross-section between it and the first member by engaging the first edge with the second edge. The first supporting part is located inside the closed cross-section with respect to the second supported part and supports the second supported part. The second supporting part is located inside the closed cross-section with respect to the first supported part and supports the first supported part.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a closed cross-sectional structure used as a fixture or as a part of a fixture. [Background technology]

[0002] 2. Description of the Related Art Closed cross-sectional structures having at least a partially closed cross-sectional portion are often used for fixtures such as partitions, desk equipment, and storage shelves used in offices, public facilities, and the like (for example, Patent Document 1).

[0003] The closed cross-section structure described in Patent Document 1 has a reinforcing panel joined to an edge of a base panel, and a closed cross-section is formed by the base panel and the reinforcing panel. The base panel has a side edge extension wall extending toward the back surface of the main panel wall connected to an end edge of the flat main panel wall, and a flange wall extending from the extending end of the side edge extension wall. The flange wall extends while bending toward the side facing the back surface of the main panel wall. The base panel is formed into a U-shaped cross-section by the main panel wall, the side edge extension wall, and the flange wall.

[0004] The reinforcing panel includes a first connection portion connected to the rear surface of the flange wall, a second connection portion connected to the rear surface of the main panel wall, and an intermediate wall having a generally L-shaped cross section that connects the first connection portion and the second connection portion. The first connection portion and the flange wall, and the second connection portion and the main panel wall are fixed together by welding or the like.

[0005] The reinforcing panel further includes an abutment wall that is bent at a substantially right angle from the extending end of the first connection portion and abuts against the back surface of the side edge extending wall. The abutment wall has a base end that is a connecting portion with the first connection portion and abuts against the back surface of the flange wall together with the first connection portion, and an end in the extending direction abuts against the back surface of the main panel wall. The abutment wall of the reinforcing panel restricts crushing of the closed cross-sectional structure by abutting against the side edge wall on the base panel side, the flange wall, and the back surface of the main panel wall. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-22806 A Summary of the Invention [Problem to be solved by the invention]

[0007] The closed section structure described in Patent Document 1 needs to be manufactured with high dimensional accuracy so that the first connection portion and the butt wall on the reinforcing panel side abut against the side edge wall, flange wall, and back surface of the main panel wall on the base panel side. However, if an attempt is made to increase the manufacturing accuracy of the components of the closed section structure, not only will the manufacturing process become more complicated, but it will also likely lead to a rise in product costs.

[0008] Therefore, an object of the present invention is to provide a closed cross-sectional structure which can obtain a closed cross-section with high strength without requiring extremely high manufacturing precision. [Means for solving the problem]

[0009] In order to solve the above problems, the closed cross-sectional structure according to the present invention employs the following configuration. That is, the closed cross-section structure of the invention comprises a first member having a first supporting portion and a first supported portion at a first end edge, which is one of the ends, and a second member having a second supporting portion and a second supported portion at a second end edge, which is one of the ends, and which forms a closed cross-section between the first member by engagement between the first end edge and the second end edge, wherein the first supporting portion is located inside the closed cross-section relative to the second supported portion and supports the second supported portion, and the second supporting portion is located inside the closed cross-section relative to the first supported portion and supports the first supported portion.

[0010] In a closed cross-section structure of this configuration, a first support portion provided on a first edge of a first member supports a second supported portion on a second edge of a second member. At the same time, a second support portion provided on a second edge of a second member supports a first supported portion on a first edge of a first member. Therefore, the first edge of a first member and the second edge of a second member are engaged in a manner that supports each other from the inside direction of the closed cross-section. Therefore, when this configuration is adopted, a closed cross-section with high strength can be obtained.

[0011] The first edge of the first member has a first edge main body extending toward the second edge and a first protruding piece protruding from the extended end of the first edge main body, and the second edge of the second member has a second edge main body extending toward the first edge and a second protruding piece protruding from the extended end of the second edge main body at a position not overlapping with the first protruding piece, wherein a surface of the first protruding piece facing outward from the closed cross section constitutes the first supporting portion, a surface of the second edge main body facing inward from the closed cross section constitutes the second supported portion supported by the first supporting portion, a surface of the second protruding piece facing outward from the closed cross section constitutes the second supporting portion, and a surface of the first edge main body facing inward from the closed cross section constitutes the first supported portion supported by the second supporting portion.

[0012] In this case, the first protruding piece protruding from the first edge body of the first member wraps around to the inside (inside of the closed cross section) of the second edge body of the second member to support the inner surface. Also, the second protruding piece protruding from the second edge body of the second member wraps around to the inside (inside of the closed cross section) of the second edge body of the first member at a position where it does not overlap with the first protruding portion to support the inner surface. Therefore, the first member and the second member can be engaged in a manner that supports each other from the inside direction of the closed cross section simply by wrapping the first protruding piece and the second protruding portion around the inner surface of the edge body of the mating panel. Therefore, when this configuration is adopted, a closed cross section with high strength can be obtained with a simple configuration that is easy to manufacture and assemble.

[0013] At least one of the first protruding pieces and the second protruding pieces may be provided in plurality, and the first protruding pieces and the second protruding pieces may be arranged alternately along the end faces of the first edge body and the second edge body in the extension direction.

[0014] In this case, a protruding piece (second protruding piece or first protrusion) protruding from one of the first member and the second member is disposed between two protruding pieces (first protruding piece or second protruding piece) protruding from the other member. Therefore, the relative twisting of the first member and the second member is restricted by the alternatingly arranged first protruding piece and second protruding piece. Therefore, when this configuration is adopted, the mutual constraint between the first member and the second member is strengthened, making it possible to obtain a closed cross section with higher strength.

[0015] The root portions of the first projecting piece and the second projecting piece may each have a bent portion that is bent in a stepped shape on the inside of the closed cross section.

[0016] In this case, the end face of the second edge body of the second member in the extending direction is disposed at the bent portion of the first protruding piece, and the end face of the first edge body of the first member in the extending direction is disposed at the bent portion of the second protruding piece. Therefore, the first edge body of the first member and the second edge body of the second member are almost flush with each other, and unevenness is unlikely to occur on the surface side of the engagement portion. Therefore, when this configuration is adopted, the appearance from the outside is improved, and it is possible to avoid interference with other members due to unevenness.

[0017] The bent portion may be formed so that end faces of the first edge body and the second edge body in the extending direction form a straight line in a plan view.

[0018] In this case, the end face of the first edge body in the extending direction and the end face of the second edge body in the extending direction face each other in a straight line in a plan view, which improves the appearance from the outside and reduces the occurrence of unevenness on the surface side of the engagement part.

[0019] At least one of the first protruding piece and the second edge body, and the second protruding piece and the first edge body may be fixed by a fixing member.

[0020] In this case, the first edge of the first member and the second edge of the second member are engaged by the first protruding piece and the second protruding piece, and at least one of the first protruding piece and the second edge main body and the second protruding piece and the first edge main body is fixed by the fixing member. Therefore, when this configuration is adopted, the strength of the engagement portion between the first member and the second member can be further increased. Furthermore, the first and second members can be engaged using the first and second protruding pieces, and in this state, at least one of the first and second protruding pieces and the second protruding piece and the first and second edge body can be fixed by a fixing member. Therefore, when this configuration is adopted, the first and second members can be easily fixed by the fixing member.

[0021] The first member has a flat main panel wall having one surface which is a decorative surface, a side edge wall extending from a side edge of the main panel wall to the side opposite the side facing the decorative surface, and a flange wall extending from the extended end of the side edge wall to a side opposite the back surface of the decorative surface of the main panel wall, and the second member has a first connection portion which engages with the flange wall, a second connection portion which is joined to the back surface of the decorative surface of the main panel wall, and an intermediate wall which connects the first connection portion and the second connection portion, and the flange wall is provided with the first supporting portion and a first supported portion, and the first connecting portion is provided with the second supporting portion and a second supported portion.

[0022] In this case, the first member is a base panel having a decorative surface, and the second member is a reinforcing panel that reinforces the side edge of the base panel. The flange wall of the first member (base panel) and the first connection portion of the second member (reinforcing panel) are engaged in a mutually supporting manner, with the first support portion and the second support portion supporting the first supported portion and the second supported portion of the mating panel. As a result, the first member (base panel) and the second member (reinforcing panel) are engaged with high strength, and a closed cross section with high strength is formed between the first member and the second member. Therefore, when this configuration is adopted, a closed cross section with high strength can be obtained with a simple configuration. Effect of the Invention

[0023] In the closed cross section structure according to the present invention, a first supporting portion provided on a first edge of a first member supports a second supported portion provided on a second edge of a second member, and the second supporting portion provided on the second edge of the second member supports the first supported portion provided on the first edge of the first member. Therefore, when the closed cross section structure according to the present invention is adopted, a closed cross section with high strength can be obtained without requiring extremely high manufacturing precision. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is an oblique view of a display unit with a tabletop according to an embodiment. [Diagram 2] FIG. 2 is a perspective view of a portion of a display unit with a tabletop according to an embodiment, viewed from the rear side. [Diagram 3] FIG. 1 is a perspective view of a closed cross-sectional structure according to a first embodiment. [Figure 4] FIG. 2 is an exploded perspective view of the closed section structure of the first embodiment. [Diagram 5] FIG. 2 is a perspective view showing a portion of a base panel of the closed cross-sectional structure of the first embodiment. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. 5 . [Figure 7] FIG. 2 is a perspective view showing a portion of a reinforcing panel of the closed section structure of the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9]FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] An enlarged view of part X in Figure 9. [Figure 11] 10 is a cross-sectional view similar to FIG. 9 of a closed cross-sectional structure according to a second embodiment. [Figure 12] 10 is a cross-sectional view similar to FIG. 9 of a closed cross-sectional structure of Modification 1. FIG. [Figure 13] 10 is a cross-sectional view similar to FIG. 9 of a closed cross-sectional structure according to a third embodiment. [Figure 14] An enlarged view of part XIV in FIG. [Figure 15] 10 is a cross-sectional view similar to FIG. 9 of a closed cross-sectional structure of a modified example 2. FIG. [Figure 16] 10 is a cross-sectional view similar to FIG. 9 of a closed cross-sectional structure of a modified example 3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments and modifications described below, the same parts are denoted by the same reference numerals, and some overlapping descriptions will be omitted.

[0026] Fig. 1 is a perspective view of a fixture 1 with a tabletop that employs a closed cross-sectional structure 20 of this embodiment. Fig. 2 is a perspective view of a part of the fixture 1 with a tabletop, seen from the rear side. The fixture 1 with a tabletop is used, for example, in educational facilities, medical facilities, research facilities, office spaces, etc. The tabletop-equipped furniture 1 includes a pair of supports 10 that are erected on the floor surface F of an office space at a distance from one another, a plurality (three) of article storage shelves 11 that are erected on the pair of supports 10, a tabletop 12 that is erected on the pair of supports 10 below the lowest article storage shelf 11, and a pair of side panels 13 whose rear ends are connected to the supports 10. The side panels 13 cover the sides of the base side area of ​​the tabletop 12, creating an environment (space) in which workers facing the tabletop 12 can easily concentrate. In addition, the surface of the side panels 13 that faces the outside (the surface that does not face the tabletop 12) is a decorative surface 21, and the appearance from the outside is well maintained. The closed section structure 20 of this embodiment is used for, for example, the side panels 13 and the rear panel 15. The closed section structure 20 of this embodiment that is used for the side panels 13 and the rear panel 15 is a panel structure that divides a space. However, the use of the closed cross-sectional structure 20 is not limited to this, and it can also be used, for example, as a top plate for fixtures, a door for a storage shelf, a partition, etc.

[0027] First Embodiment FIG. 3 is a perspective view of the closed section structure 20 of this embodiment as viewed from the rear side, and FIG. 4 is an exploded perspective view of the closed section structure 20. As shown in FIG. The closed cross-sectional structure 20 includes a base panel 22 (first member) having a decorative surface 21 (see Figs. 1 and 2) and rectangular in front view, a pair of side reinforcing panels 23 (second member) joined to both side edges on the back side of the base panel 22, and a central reinforcing panel 24 joined to approximately the center of the back side of the base panel 22. The pair of side reinforcing panels 23 and the central reinforcing panel 24 are each joined to the base panel 22 to form a closed cross section between the base panel 22 and the pair of side reinforcing panels 23 and the central reinforcing panel 24. In this embodiment, the base panel 22, the side reinforcing panels 23, and the central reinforcing panel 24 are formed of metal plate material. However, they may be formed of materials other than metal.

[0028] In the following description of the closed cross-sectional structure 20, the short direction of the rectangular shape in a front view of the base panel 22 is referred to as the "first direction," and the long direction of the rectangular shape is referred to as the "second direction." Also, the direction perpendicular to the first and second directions is referred to as the "third direction." Note that, in the appropriate places of the drawings, an arrow x pointing to the first direction, an arrow y pointing to the second direction, and an arrow z pointing to the third direction are indicated. Furthermore, in the following description, the “rear surface” of the base panel 22 refers to the surface located behind the decorative surface 21 .

[0029] Fig. 5 is a perspective view of a part of the base panel 22 as viewed from the rear side. Fig. 6 is a cross-sectional view of the base panel 22 taken along line VI-VI in Fig. 5. The base panel 22 includes a flat main panel wall 25, one surface of which is the decorative surface 21, first side edge walls 26 (side edge walls) extending from both side edges of the main panel wall 25 in the first direction to the side opposite to the side on which the decorative surface 21 faces, and first flange walls 28 (flange walls) extending from the extending ends of the first side edge walls 26 to the side facing the back surface 27 of the decorative surface 21. The first side edge walls 26 extend along the third direction and the second direction at the side edges of both sides of the main panel wall 25 in the first direction. The first flange walls 28 extend along the first direction and the second direction at the extending ends of the first side edge walls 26, and are parallel to the main panel wall 25 and face the back surface 27 of the main panel wall 25.

[0030] The base panel 22 further includes second side edge walls 29 extending from both side edges of the main panel wall 25 in the second direction to the side opposite to the side facing the decorative surface 21, and second flange walls 30 extending from the extending ends of the second side edge walls 29 to the side facing the back surface 27 of the decorative surface 21. The second side edge walls 29 extend along the third direction and the first direction at both side edges of the main panel wall 25 in the second direction. The second flange walls 30 extend along the first direction and the second direction at the extending ends of the second side edge walls 29, and are parallel to the main panel wall 25 and face the back surface 27 of the main panel wall 25. The extending length of the second side edge walls 29 in the third direction is set to be approximately the same as the extending length of the first side edge walls 26 in the third direction.

[0031] 4, ends of the adjacent first flange walls 28 are overlapped in the plate thickness direction at both ends of the second flange wall 30 in the first direction. The overlapping portions of the second flange wall 30 and the first flange wall 28 are fixed by rivets 31 that penetrate the second flange wall 30 and the first flange wall 28 in the plate thickness direction.

[0032] As described above, the first side edge wall 26 and the first flange wall 28 are connected to both side edges of the base panel 22 in the first direction, and the second side edge wall 29 and the second flange wall 30 are connected to both side edges of the base panel 22 in the second direction. As a result, a continuous frame shape that opens inwardly in a roughly U-shape is formed around the periphery of the base panel 22.

[0033] The first flange walls 28 arranged on both sides of the base panel 22 in the first direction have a flange body 28a extending a certain length from the extending end of the first side edge wall 26 toward the center of the main panel wall 25 (toward the side of the first connecting portion 34 of the side reinforcing panel 23 described later), and a plurality of first protruding pieces 32 protruding from the extending end of the flange body 28a. In this embodiment, the flange body 28a constitutes the first edge body on the first member side. The end face of the flange body 28a in the extending direction extends linearly along the second direction. That is, the end face of the flange body 28a in the extending direction is formed to be linear in a plan view. The plurality of first protruding pieces 32 protrude from the end face of the flange body 28a extending linearly at a predetermined interval in the second direction. In this embodiment, the flange main body portion 28a, which is the first edge main body, and the multiple first protruding pieces 32 form the first edge on the first member side.

[0034] 6, a bent portion 33 that is bent in a stepped shape toward the back surface 28ab of the flange main body 28a is provided at the base portion of each of the first protruding pieces 32. The height of the stepped portion of the bent portion 33 is set to be substantially equal to the thickness dimension of the base panel 22 and the side reinforcing panel 23. The back surface 28ab of the flange main body portion 28a (first edge main body) refers to the surface facing the inside of the closed cross section formed by the base panel 22 and the side reinforcing panel 23.

[0035] The side reinforcement panels 23 arranged on both sides in the first direction have the same basic configuration. However, the side reinforcement panel 23 arranged on one side in the first direction and the side reinforcement panel 23 arranged on the other side in the first direction have different extension widths in the first direction. In addition, the two side reinforcement panels 23 are joined to the base panel 22 by a similar joint structure. The side reinforcement panels 23 extend from one end side to the other end side of the base panel 22 in the second direction along the side edges of the main panel wall 25 of the base panel 22.

[0036] Fig. 7 is a perspective view of one side reinforcing panel 23 as viewed from the back side of the closed cross-sectional structure 20. Fig. 8 is a cross-sectional view of one side reinforcing panel 23 taken along line VIII-VIII in Fig. 7. Fig. 9 is a cross-sectional view of the closed cross-sectional structure 20 taken along line IX-IX in Fig. 3. The side reinforcement panel 23 has a first connection portion 34 connected to the first flange wall 28 of the base panel 22, a second connection portion 35 connected to the back surface 27 of the main panel wall 25 of the base panel 22, and an intermediate wall 36 connecting the first connection portion 34 and the second connection portion 35.

[0037] The intermediate wall 36 has a cross section perpendicular to the first direction formed into a substantially L-shape. When the side reinforcing panel 23 is attached to the base panel 22, one side 36a of the substantially L-shape of the intermediate wall 36 is parallel to the first side edge wall 26 of the base panel 22 and faces the inner surface of the first side edge wall 26. The other side 36b of the substantially L-shape of the intermediate wall 36 is parallel to the main panel wall 25 of the base panel 22 and faces the back surface 27 of the main panel wall 25.

[0038] The first connection portion 34 is formed continuously with the end of the other side 36b of the intermediate wall 36. The first connection portion 34 has a main body wall 34a extending linearly from the other side 36b of the intermediate wall 36, and a plurality of second protruding pieces 37 protruding from the extending end of the main body wall 34a. In this embodiment, the main body wall 34a constitutes the second edge main body on the first member side. The end face of the main body wall 34a of the first connection portion 34 in the extending direction extends linearly along the second direction. That is, the end face of the main body wall 34a in the extending direction is formed to be a straight line in a plan view. The plurality of second protruding pieces 37 are protruding from the end face of the main body wall 34a extending linearly in the second direction at a predetermined interval. However, the second protruding pieces 37 are arranged at a position that does not overlap with the first protruding pieces 32 on the base panel 22 side in the second direction. In this embodiment, the main body wall 34a, which is the second edge main body, and the multiple second protruding pieces 37 form the second edge on the second member side.

[0039] 8, a bent portion 38 that is bent in a stepped shape toward the back surface 34ab of the main body wall 34a is provided at the base portion of each second protruding piece 37. The height of the stepped portion of the bent portion 38 is set to be substantially equal to the thickness dimension of the base panel 22 and the side reinforcing panel 23. The back surface 28ab of the main body wall 34a (second edge main body) refers to the surface facing the inside of the closed cross section formed by the base panel 22 and the side reinforcing panel 23.

[0040] An end face of the main body wall 34a of the first connection portion 34 abuts against an end face of the flange main body portion 28a of the first flange wall 28 on the base panel 22 side. In this embodiment, the main body wall 34a of the first connection portion 34 and the flange main body portion 28a of the first flange wall 28 face each other on the same plane, but there may be a slight misalignment between the main body wall 34a and the flange main body portion 28a in the thickness direction of the panel.

[0041] As described above, when the end face of the main body wall 34a of the first connection portion 34 is butted against the end face of the flange main body portion 28a of the first flange wall 28, the second protruding piece 37 on the first connection portion 34 side is inserted into the back surface 28ab of the flange main body portion 28a on the first flange wall 28 side, and the first protruding piece 32 on the first flange wall 28 side is inserted into the back surface 34ab of the main body wall 34a on the first connection portion 34 side. As a result, the surface 37b of the second protruding piece 37 on the first connection portion 34 side wraps around the back surface 28ab of the first flange wall 28 to support the back surface 28ab, and the surface 32b of the first protruding piece 32 on the first flange wall 28 side wraps around the back surface 34ab of the first connection portion 34 to support the back surface 34ab. In this embodiment, the surface 32b of the first protruding piece 32 constitutes a first support portion, and the surface 37b of the second protruding piece 37 constitutes a second support portion. The surfaces 32b, 37b of the first protruding piece 32 and the second protruding piece 37 refer to the surfaces facing outward of the closed cross section formed by the base panel 22 and the side reinforcing panel 23.

[0042] Further, the second connection portion 35 of the side reinforcement panel 23 is continuous with an extending end of one side 36a of the intermediate wall 36. The second connection portion 35 is formed by bending the end of the one side 36a of the intermediate wall 36 at a substantially right angle. The second connection portion 35 is bent in the opposite direction to the extending side of the first connection portion 34. One surface of the second connection portion 35 faces the back surface 27 of the main panel wall 25 of the base panel 22. The second connection portion 35 is joined to the back surface 27 of the main panel wall 25 with double-sided tape 50, which is an adhesive member.

[0043] 10, the first flange wall 28 on the base panel 22 side and the first connection portion 34 on the side reinforcing panel 23 side are fixed by a rivet 55 (fixing member) that penetrates the first flange wall 28 and the first connection portion 34 in the plate thickness direction. Specifically, rivet holes 39, 40 are formed in the overlapping portions of the second protruding piece 37 and the flange main body portion 28a, respectively. A shaft portion 55a of the rivet 55 is inserted into these rivet holes 39, 40. In this state, the rivet 55 firmly fixes the overlapping portions of the second protruding piece 37 and the flange main body portion 28a by crimping the axial end portion.

[0044] 3 and 4, the cross section perpendicular to the second direction of the central reinforcing panel 24 is formed in a hat shape. The hat-shaped cross section of the central reinforcing panel 24 extends along the second direction. Two flange portions 24a of the central reinforcing panel 24 spaced apart from each other in the first direction are joined to the back surface 27 of the main panel wall 25 of the base panel 22 by an adhesive means such as double-sided tape.

[0045] (Effects of the embodiment) As described above, in the closed cross-sectional structure 20 of this embodiment, the surface 32b of the first protruding piece 32 (first support portion) provided on the edge of the base panel 22 (first member) supports the back surface 34ab of the first connecting portion 34 (main body wall 34a) of the side reinforcement panel 23 (second member), and the surface 37b of the second protruding piece 37 (second support portion) provided on the edge of the side reinforcement panel 23 supports the back surface 28ab of the first flange wall 28 (flange main body portion 28a) of the base panel 22. Therefore, the edges of the base panel 22 and the side reinforcement panel 23 are engaged with each other in a manner that they support each other from the back surface direction. Therefore, when the closed cross-sectional structure 20 of this embodiment is adopted, a closed cross-section with high strength can be obtained without requiring extremely high manufacturing precision.

[0046] In particular, in the closed cross-sectional structure 20 of this embodiment, a first protruding piece 32 is protrudingly provided on the first flange wall 28 on the base panel 22 (first member) side, and a second protruding piece 37 is protrudingly provided on the first connection portion 34 on the side reinforcement panel 23 (second member) side at a position that does not overlap with the first protruding piece 32. The surface 32b of the first protruding piece 32 wraps around the back surface 34ab of the first connection portion 34 (main body wall 34a) of the side reinforcement panel 23 to support the back surface 34ab, and the surface 37b of the second protruding piece 37 wraps around the back surface 28ab of the first flange wall 28 (flange main body portion 28a) of the base panel 22 to support the back surface 28ab. Therefore, the first protruding piece 32 and the second protruding piece 37 can be engaged with each other in a manner supporting each other from the back surface direction simply by wrapping around the back surface of the mating panel. Therefore, when this configuration is adopted, the base panel 22 (first member) and the side reinforcing panel 23 (second member) can be engaged with high strength with a simple configuration that is easy to manufacture and assemble. Therefore, a closed cross section with high strength can be obtained with a simple configuration that is easy to manufacture and assemble.

[0047] Furthermore, the closed cross-sectional structure 20 of this embodiment is provided with a plurality of first protruding pieces 32 and a plurality of second protruding pieces 37, which are arranged alternately along the y direction. Therefore, the relative twisting between the first flange wall 28 on the base panel 22 side and the first connection portion 34 on the side reinforcing panel 23 side can be regulated by the first protruding pieces 32 and the second protruding pieces 37 arranged alternately. Therefore, when this configuration is adopted, the binding at the engagement portion between the first flange wall 28 and the first connection portion 34 is strengthened, and the base panel 22 (first member) and the side reinforcing panel 23 (second member) are engaged with even higher strength. As a result, it is possible to obtain a higher closed cross section. In this embodiment, a plurality (two or more) of the first protruding pieces 32 and the second protruding pieces 37 are provided, but the number of protruding pieces on one side may be one as long as the first protruding pieces 32 and the second protruding pieces 37 are arranged alternately. However, when a plurality of the first protruding pieces 32 and the second protruding pieces 37 are provided as in this embodiment, the load support portions (protruding pieces) can be distributed to a plurality of locations in the second direction, which is more advantageous in obtaining high strength.

[0048] Moreover, in the closed cross-sectional structure 20 of this embodiment, bent portions 33, 38 that are bent in a stepped shape toward the back surfaces 28ab, 34ab are provided at the root portions of the first protruding piece 32 and the second protruding piece 37. Therefore, the facing portions of the first flange wall 28 and the first connecting portion 34 become substantially flush, and unevenness is less likely to occur on the front surface side of the engagement portion. Therefore, when this configuration is adopted, the appearance of the engagement portion between the first flange wall 28 and the first connection portion 34 from the outside is improved, and it is possible to avoid interference with other components due to unevenness.

[0049] Furthermore, in the closed cross-sectional structure 20 of this embodiment, the bent portions 33, 38 of the first protruding piece 32 and the second protruding piece 37 are formed so that the end faces of the opposing portions of the first flange wall 28 and the first connecting portion 34 form a straight line in a plan view. As a result, the boundary portion of the opposing portions of the first flange wall 28 and the first connecting portion 34 becomes straight, improving the appearance from the outside and making it more difficult for unevenness to occur on the surface side of the engagement portion.

[0050] Furthermore, in the closed cross-sectional structure 20 of this embodiment, the first flange wall 28 and the first connecting portion 34 are engaged with each other by the first protruding piece 32 and the second protruding piece 37, and in this state, the flange main body portion 28a of the first flange wall 28 and the second protruding piece 37 of the first connecting portion 34 are fixed with a rivet 55 (fixing member). For this reason, when this configuration is adopted, the strength of the engagement portion between the first flange wall 28 and the first connecting portion 34 can be further increased.

[0051] Furthermore, when this configuration is employed, the first flange wall 28 and the first connecting portion 34 can be fixed with the rivet 55 in a state in which the first flange wall 28 and the first connecting portion 34 are engaged with each other by the first protruding piece 32 and the second protruding piece 37. Therefore, the work of fixing the first flange wall 28 and the first connecting portion 34 with the rivet 55 can be easily performed. In this embodiment, the flange main body portion 28a of the first flange wall 28 and the second protruding piece 37 of the first connecting portion 34 are fixed by the rivet 55, but the first protruding piece 32 of the first flange wall 28 and the main body wall 34a of the first connecting portion 34 may be fixed by a fixing member such as the rivet 55. Also, the flange main body portion 28a and the second protruding piece 37 may be fixed by a fixing member such as the rivet 55, and the first protruding piece 32 and the main body wall 34a may also be fixed by a fixing member such as the rivet 55.

[0052] The base panel 22 of the closed cross-section structure 20 of this embodiment has a flat main panel wall 25 having one surface that becomes the decorative surface 21, a first side edge wall 26 (side edge wall) extending from a side edge of the main panel wall 25 to the side opposite to the side facing the decorative surface 21, and a first flange wall 28 (flange wall) extending from the extending end of the first side edge wall 26 to the side facing the back surface 27 of the decorative surface 21 of the main panel wall 25. The side reinforcing panel 23 (reinforcing panel) has a first connecting portion 34 connected to the first flange wall 28, a second connecting portion 35 joined to the back surface 27 of the decorative surface 21 of the main panel wall 25, and an intermediate wall 36 connecting the first connecting portion 34 and the second connecting portion 35. The first flange wall 28 is provided with a first protruding piece 32 that supports the main body wall 34a on the first connection portion 34 side from the back side, and the first connection portion 34 is provided with a second protruding piece 37 that supports the flange main body portion 28a on the first flange wall 28 side from the back side. For this reason, in the closed cross-sectional structure 20 of this embodiment, the base panel 22 and the side reinforcing panel 23 are engaged with high strength, and a strong closed cross-section is formed between the base panel 22 and the side reinforcing panel 23. Therefore, when this configuration is adopted, a strong closed cross-section can be obtained with a simple configuration.

[0053] <Second embodiment> FIG. 11 is a cross-sectional view similar to FIG. 9 of the closed cross-sectional structure 120 of this embodiment. The closed cross-section structure 120 of this embodiment includes a base panel 122, which is a first member, and a side reinforcing panel 123, which is a second member. The base panel 122 has a main panel wall 25 having a decorative surface 21, a first side edge wall 26, and a first flange wall 28. The side reinforcing panel 123 has a first connecting portion 134, a second connecting portion 35, and an intermediate wall 36.

[0054] The first flange wall 28 on the base panel 122 side is provided with a flange main body 28a and a plurality of first protruding pieces 32 similar to those in the first embodiment. In contrast, the first connection portion 134 on the side reinforcement panel 123 side is not provided with a second protruding piece. The first connection portion 134 extends to a position where the tip side region 134a in the extension direction wraps around the back surface 28ab of the flange main body 28a. In addition, a plurality of insertion holes 60 that allow the insertion of the first protruding pieces 32 on the first flange wall 28 side are formed in the middle of the extension direction of the first connection portion 134. The first protruding pieces 32 inserted into the insertion holes 60 wrap around the back surface 134b of the base region of the first connection portion 134. Therefore, in this embodiment, the surface 32b of the first protruding piece 32 wraps around the back surface 134b of the base region of the first connection portion 134 to support the back surface 134b, and the surface 134ab of the tip side region 134a of the first connection portion 134 wraps around the back surface 28ab of the flange main body portion 28a of the first flange wall 28 to support the back surface 28ab.

[0055] In this embodiment, the surface 32b of the first protruding piece 32 constitutes the first supporting portion, and the back surface 28ab of the flange main body 28a constitutes the first supported portion. Also, the surface 134ab of the tip side region 134a of the first connecting portion 134 constitutes the second supporting portion, and the back surface 134b of the base side region of the first connecting portion 134 constitutes the second supported portion. is. In addition, in FIG. 11, the first protruding piece 32 extends linearly from the flange main body portion 28a, but the base portion of the first protruding piece 32 may be provided with a stepped bent portion similar to the first embodiment.

[0056] In the closed cross-section structure 120 of this embodiment, the surface 32b of the first protruding piece 32 provided on the edge on the base panel 122 side supports the back surface 134b of the first connecting portion 134 on the side reinforcement panel 123 side, and the surface 134ab of the tip side region 134a of the first connecting portion 134 provided on the edge on the side reinforcement panel 123 side supports the back surface 28ab of the flange main body portion 28a on the base panel 122 side. Therefore, in the case of this embodiment as well, the edges of the base panel 122 and the side reinforcement panel 123 are engaged with each other in a manner that they support each other from the back surface direction. Therefore, in this embodiment as well, a closed cross section with high strength can be obtained without requiring extremely high manufacturing precision.

[0057] <Variation 1> FIG. 12 is a cross-sectional view similar to FIG. 9 of the closed cross-sectional structure 120A of the first modified example. In the closed cross-sectional structure 120A of the present modified example 1, the structure of the first flange wall 128 on the base panel 122A side and the structure of the first connection portion 34 on the side reinforcing panel 123A side are reversed. That is, the first flange wall 128 extends to a position where the tip side region 128a in the extending direction wraps around the back surface 34ab of the main body wall 34a of the first connection portion 34, and an insertion hole 60A is formed in the middle of the extending direction of the first flange wall 128. The first connection portion 34 is provided with the main body wall 34a and a plurality of second protruding pieces 37. The surface 128c of the tip side region 128a of the first flange wall 128 wraps around the back side 34ab of the main body wall 34a of the first connecting portion 34 and supports said back side 34ab, and the surface 37b of the second protruding piece 37 of the first connecting portion 34 wraps around the back side 128b of the base side region of the first flange wall 128 through the insertion hole 60A of the first flange wall 128 and supports said back side 128b. Therefore, in the case of the present modified example 1, the same effects as those of the above-mentioned second embodiment can be obtained. In the first modification, a surface 128c of the tip side region 128a of the first flange wall 128 constitutes the first supporting portion, and a base side region of the first flange wall 128 constitutes the first supported portion. A surface 37b of the second projecting piece 37 constitutes the second supporting portion, and a back surface 34ab of the main body wall 34a of the first connecting portion 34 constitutes the second supported portion.

[0058] <Third embodiment> FIG. 13 is a cross-sectional view of the closed cross-sectional structure 220 of this embodiment similar to FIG. 9, and FIG. 14 is an enlarged view of a portion XIV in FIG. The closed cross-section structure 220 of this embodiment includes a base panel 222, which is a first member, and a side reinforcing panel 223, which is a second member. The base panel 222 has a main panel wall 25 having a decorative surface 21, a first side edge wall 26, and a first flange wall 228. The side reinforcing panel 223 has a first connecting portion 234, a second connecting portion 35, and an intermediate wall 36.

[0059] The first flange wall 228 of the base panel 222 has a flange main body portion 228a extending from the extending end of the first side edge wall 26 in a direction facing the main panel wall 25, and a bent wall 45 extending and bending from the extending end of the flange main body portion 228a toward the back surface 27 side of the main panel wall 25. An insertion hole 65 is formed in a midway portion of the extending direction of the bent wall 45.

[0060] The first connection portion 234 of the side reinforcement panel 223 has a main body wall 234a continuing from the intermediate wall 36, a bent wall 46 extending from an extending end of the main body wall 234a toward the back surface 27 of the main panel wall 25, and a protruding piece 237 extending from an extending end of the bent wall 46 toward the first side edge wall 26. The bent wall 46 abuts against the bent wall 45 on the first flange wall 228 side at their opposing surfaces. The protruding piece 237 is inserted into the insertion hole 65 of the bent wall 45 on the first flange wall 228 side.

[0061] 14, the insertion hole 65 has a surface 65a facing the same side as the back surface 228ab of the flange main body 228a, and a surface 65b facing the opposite side to the back surface 228ab of the flange main body 228a. For convenience of explanation, the surface 65a facing the same side as the back surface 228ab will be referred to as the "upper wall surface 65a," and the surface 65b facing the opposite side to the back surface 228ab will be referred to as the "lower wall surface 65b." In addition, the protruding piece 237 inserted into the insertion hole 65 has a surface 237a facing the upper wall surface 65a of the insertion hole 65, and a surface 237b facing the lower wall surface 65b of the insertion hole 65. Hereinafter, the surface 237a facing the upper wall surface 65a of the insertion hole 65 will be referred to as the "upper surface 237a", and the surface 237b facing the lower wall surface 65b of the insertion hole 65 will be referred to as the "lower surface 237b".

[0062] In the closed cross-sectional structure 220 of the present embodiment, the protruding piece 237 on the first connection portion 234 side is inserted into the insertion hole 65 on the first flange wall 228 side, so that the upper surface 237a of the protruding piece 237 faces the upper wall surface 65a of the insertion hole 65, and the lower surface 237b of the protruding piece 237 faces the lower wall surface 65b of the insertion hole 65. Therefore, the upper wall surface 65a of the insertion hole 65 of the first flange wall 228 is supported by the upper surface 237a of the protruding piece 237. Also, the lower surface 237b of the protruding piece 237 of the first connection portion 234 is supported by the lower wall surface 65b of the insertion hole 65. In this embodiment, the lower wall surface 65b of the insertion hole 65 on the first flange wall 228 side constitutes the first supporting portion, and the upper wall surface 65a of the insertion hole 65 on the first flange wall 228 side constitutes the first supported portion. Also, the upper surface 237a of the protruding piece 237 on the first connecting portion 234 side constitutes the second supporting portion, and the lower surface 237b of the protruding piece 237 on the first connecting portion 234 side constitutes the second supported portion.

[0063] In the closed cross-sectional structure 220 of this embodiment, the lower wall surface 65b of the insertion hole 65 on the base panel 222 side supports the lower surface 237b of the protruding piece 237 on the side reinforcement panel 223 side, and the upper surface 237a of the protruding piece 237 on the side reinforcement panel 223 side supports the upper wall surface 65a of the insertion hole 65 on the base panel 222 side. Therefore, in the case of this embodiment as well, the edges of the base panel 222 and the side reinforcement panel 223 are engaged with each other in a manner that they support each other from the back surface direction. Therefore, in this embodiment as well, a closed cross section with high strength can be obtained without requiring extremely high manufacturing precision.

[0064] <Variation 2> FIG. 15 is a cross-sectional view similar to FIG. 9 of a closed cross-sectional structure 220A of the second modified example. In the closed cross-sectional structure 220A of the present modified example 2, a protruding piece 232 is provided on the bent wall 45 on the first flange wall 28 side, and an insertion hole 65 into which the protruding piece 232 is inserted is formed in the bent wall 46 on the first connection portion 234 side. The present modified example 2 has a configuration similar to that of the above-mentioned third embodiment, except that the positions of the protruding piece 232 and the insertion hole 65 are interchanged. Therefore, in the case of the second modification, the same effects as those of the third embodiment can be obtained.

[0065] In the second modification, the upper surface of the protruding piece 232 on the first flange wall 228 side constitutes the first supporting portion, and the lower surface of the protruding piece 232 on the first flange wall 228 side constitutes the first supported portion. Also, the lower wall surface of the insertion hole 65 on the first connecting portion 234 side constitutes the second supporting portion, and the upper wall surface of the insertion hole 65 on the first connecting portion 234 side constitutes the second supported portion.

[0066] <Variation 3> FIG. 16 is a cross-sectional view similar to FIG. 9 of a closed cross-sectional structure 20B of the third modified example. In each of the above-mentioned embodiments, the side reinforcing panel is joined to the side edge of the base panel having a decorative surface, thereby forming a closed cross-sectional structure on the side edge of the base panel. In contrast, in the closed cross-sectional structure 20B of the present modified example 3, the first panel 22B, which is the first member, and the second panel 23B, which is the second member, are joined to each other to form a closed cross-section almost as a whole.

[0067] Specifically, in the closed cross-sectional structure 20B of the third modified example, the second connection portion 35 shown in Fig. 9 of the first embodiment is bent in the opposite direction, and the main panel wall 25 ends at the joint with the second connection portion 35. The structure of the joint between the first panel 22B and the second panel 23B is similar to that of the first embodiment shown in Fig. 9. In Fig. 16, the wall corresponding to the main panel wall 25 in Fig. 9 is denoted by the symbol 25B. In the case of deformability 3, as in the above-described embodiment and modified example, a closed cross section with high strength can be obtained without requiring extremely high manufacturing precision.

[0068] The present invention is not limited to the above embodiment, and various design changes are possible without departing from the gist of the present invention. For example, in the above embodiment, the second protruding piece 37 is fixed to the flange main body 28a by the rivet 55, which is a fixing member, but the fixing member is not limited to the rivet 55. The fixing member may be, for example, a bolt, a nut, or the like. Furthermore, the second protruding piece 37 and the flange main body 28a may be fixed by welding.

[0069] In the above embodiment, the second connection portion 35 is joined to the rear surface 27 of the main panel wall 25 by the double-sided tape 50 which is an adhesive member, but the adhesive member is not limited to the double-sided tape 50. The adhesive member may be, for example, an adhesive agent or the like. The second connection portion 35 and the main panel wall 25 may be fixed by welding.

[0070] Furthermore, in the above embodiment, the reinforcing panels (side reinforcing panels 23) are attached only to both side edges of the base panel 22 in the first direction, but similar reinforcing panels may also be attached to the side edges of the base panel 22 in the second direction.

[0071] In the above embodiment, the main panel wall 25 of the base panel 22 is formed to have a rectangular shape when viewed from the front, but the shape of the main panel wall 25 is not limited to this. The main panel wall 25 may have a polygonal shape other than a rectangle, such as a triangle, pentagon, or hexagon, when viewed from the front. [Explanation of symbols]

[0072] 20…Closed section structure 21...Cosmetic surface 22, 122, 122A, 222...Base panel (first member) 23, 123, 123A, 223...Side reinforcement panel (second member) 25…Main panel wall 26…First side edge wall (side edge wall) 28, 128, 228…First flange wall (flange wall) 28a, 228a...Flange main body portion (first edge main body) 28ab, 128b, 228ab... Back surface (surface facing the inside of the closed cross section, first supported portion) 32...first protruding piece 32b... Surface (surface facing the outside of the closed cross section, first support part) 33,38…Bend 34,134,234…First connection part 34a, 234a...Main body wall (second end body) 34ab, 234ab... Back surface (surface facing the inside of the closed cross section, second supported portion) 35…Second connection part 36…Intermediate wall 37…Second protruding piece (second support part) 37b... Surface (surface facing the outside of the closed cross section, second support part) 55…Rivet (fixing member) 134ab, 128c... Surface (surface facing the outside of the closed cross section, second support part) 65a...Upper wall surface (surface facing the inside of the closed cross section, first supported portion) 65b...Lower wall surface (surface facing the outside of the closed cross section, first support part) 237a...Top surface (surface facing the outside of the closed cross section, second support part) 237b... Lower surface (surface facing the inside of the closed cross section, second supported part)

Claims

1. a first member having a first supporting portion and a first supported portion at a first edge; a second member having a second supporting portion and a second supported portion at a second edge, the second edge being one edge, and forming a closed cross section between the first member by engaging the first edge and the second edge; the first support portion is located inside the closed cross section with respect to the second supported portion and supports the second supported portion; A closed section structure, characterized in that the second supporting portion is located inside the closed section with respect to the first supported portion and supports the first supported portion.

2. The first edge of the first member has a first edge body extending toward the second edge and a first protruding piece protruding from an extended end of the first edge body, The second edge of the second member has a second edge body extending toward the first edge, and a second protruding piece protruding from an extending end of the second edge body at a position not overlapping with the first protruding piece, A surface of the first protruding piece facing the outside of the closed cross section constitutes the first support portion, a surface of the second edge body facing the inside of the closed cross section constitutes the second supported portion supported by the first support portion, A surface of the second protruding piece facing the outside of the closed cross section constitutes the second support portion, 2. The closed cross-sectional structure according to claim 1, wherein a surface of the first edge body facing the inside of the closed cross-section constitutes the first supported portion supported by the second support portion.

3. The closed cross-sectional structure according to claim 2, characterized in that at least one of the first protruding pieces and the second protruding pieces is provided in plurality, and the first protruding pieces and the second protruding pieces are arranged alternately along the end faces in the extension direction of the first edge body and the second edge body.

4. The closed cross-sectional structure according to claim 3 , wherein each of the root portions of the first protruding piece and the second protruding piece has a bent portion that is bent in a stepped shape on the inside of the closed cross-section.

5. The closed cross-sectional structure according to claim 4 , wherein the bent portion is formed such that end faces of the first edge body and the second edge body in the extending direction form straight lines in a plan view.

6. 3. The closed cross-sectional structure according to claim 2, wherein at least one of the first protruding piece and the second edge body, and the second protruding piece and the first edge body, is fixed by a fixing member.

7. The first member is The main panel wall is flat, with one side being a decorative surface. A side edge wall extending from a side edge portion of the main panel wall to a side opposite to the side facing the decorative surface; a flange wall extending from the extended end of the side edge wall to a side opposite to the back surface of the decorative surface of the main panel wall; The second member is a first connection portion engaged with the flange wall; A second connection portion joined to the back surface of the decorative surface of the main panel wall; an intermediate wall connecting the first connection portion and the second connection portion; The flange wall is provided with the first supporting portion and a first supported portion, The closed cross-sectional structure according to claim 1 , wherein the first connecting portion is provided with the second supporting portion and a second supported portion.

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