Joint structure

Abstract

The joint structure 1 includes a first member 10, a second member 20 disposed opposite the first member 10, a joint 50 that bonds the first member 10 and the second member 20 by adhesive, and a suppression portion 22. The suppression portion 22 is disposed in a target area A10 that includes a joint area A11 where the joint 50 is disposed and a peripheral area A12 surrounding the joint area A11, and suppresses the first member 10 and the second member 20 from approaching each other. The suppression portion 22 protrudes from the second member 20 toward the first member 10. The joint 50 has a constricted portion 51 midway in the direction Z in which the first member 10 and the second member 20 face each other. The minimum outer diameter D51 of the constricted portion 50 is larger than the outer diameter D22 of the tip of the suppression portion 22.

Description

[Technical Field]

[0001] The present disclosure relates to a joint structure using an adhesive. [Background technology]

[0002] Some exterior parts of automobiles are made up of thin panels. For example, panels such as the outer panel of an automobile hood are joined to an inner member with an adhesive such as mastic sealer at a position that maintains a certain clearance from the inner member (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-147940 Summary of the Invention [Problem to be solved by the invention]

[0004] Usually, when the outer panel and the inner member are joined with an adhesive, the adhesive has not yet hardened, and the outer panel and the inner member are in a state where they can easily move relative to each other. In this state, the outer panel may be washed with a powerful shower. At this time, the outer panel is subjected to a strong external force from the shower water.

[0005] Here, when the outer panel is thick, its rigidity is high, so even if a strong external force acts on the outer panel, the amount of deflection and displacement at the adhesive-applied portion of the outer panel is small. However, panels are required to be further lightened to improve energy-saving performance. To reduce the weight of automobile bodies, when the thickness of outer panels of automobile bodies such as hoods, doors, and roofs is reduced to less than 0.6 mm, the outer panel becomes particularly prone to deflection. Therefore, when a thin outer panel is subjected to an external force such as a high-pressure shower, if the adhesive is relatively soft before hardening, the external force temporarily narrows the clearance between the outer panel and the inner member. As a result, the adhesive between the outer panel and the inner member is severely crushed. If the adhesive is severely crushed, even if the external force is removed and the clearance between the outer panel and the inner member returns to normal, the adhesive may become deficient. Such a deficient state is undesirable for ensuring the adhesive bond strength between the outer panel and the inner member.

[0006] In view of the above problems, the present disclosure aims to suppress deficiencies in joints formed with adhesive in joint structures for automobile panels and the like, thereby enabling the original joint performance to be exhibited. [Means for solving the problem]

[0007] The present disclosure relates to the following joining structure.

[0008] (1) a first member; a second member disposed opposite the first member; A joining structure including a joining portion that joins the first member and the second member by adhesion, a suppression unit that suppresses approach of the first member and the second member in a target area including a joint area where the joint is arranged and a peripheral area around the joint area; the suppression portion protrudes from the second member toward the first member, the joint portion has a constricted portion midway in the direction in which the first member and the second member face each other, A joining structure in which the minimum outer diameter of the constricted portion is larger than the outer diameter of the tip of the suppression portion.

[0009] (2) The joint structure according to (1), wherein the suppression portion is provided in a part of the target area.

[0010] (3) the second member includes a flat portion, The joint structure according to (1) or (2), wherein the suppression portion protrudes from the flat portion toward the first member in the target region.

[0011] (4) The second member includes a flat portion and a convex base that protrudes from the flat portion toward the first member in the target area, The joining structure according to (1) or (2), wherein the suppression portion protrudes from the convex base toward the first member.

[0012] (5) The second member includes a flat portion and a recessed seat recessed from the flat portion in the target area, The joint structure according to (1) or (2), wherein the suppression portion protrudes from the second member toward the first member in the target region.

[0013] (6) The joint structure according to any one of (1) to (5), wherein the joint portion covers the entirety of the suppression portion.

[0014] (7) The joint structure according to any one of (1) to (6), wherein the outer diameter of the suppression portion is equal to or less than half the outer diameter of the joint portion.

[0015] (8) The joint structure according to any one of (1) to (7), wherein a plurality of the joints are arranged side by side.

[0016] (9) The joint structure according to (8), wherein the plurality of joints are arranged in a ring shape.

[0017] (10) The joint structure according to any one of (1) to (9), wherein an outer peripheral surface of the joint portion is spaced apart from the first member and the second member.

[0018] (11) The first member is an outer panel of an automobile, the second member is an inner member joined to the outer panel by the joining portion, The joining structure according to any one of (1) to (10), wherein the suppressing portion is provided on the inner member. [Effects of the Invention]

[0019] According to the present disclosure, in a joining structure for automobile panels or the like, it is possible to suppress deficiencies in the joint formed with adhesive and to exhibit the original joining performance. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a joint structure according to an embodiment of the present disclosure. [Figure 2] 2A to 2C are diagrams showing an example of a method for manufacturing a bonded structure. [Figure 3] FIG. 3 is a cross-sectional view of the main part of the first modification. [Figure 4] 4A and 4B are cross-sectional views of the main part of the second modification, with FIG. 4A showing the completed joint structure and FIG. 4B showing the joint structure in the middle of being manufactured. [Figure 5] 5A and 5B are cross-sectional views of the main part of Modification 3, with FIG. 5A showing the completed joint structure and FIG. 5B showing the joint structure in the middle of being manufactured. [Figure 6] FIG. 6A is a plan view of the main part of Modification 4 showing a configuration in which a plurality of joints are arranged side by side, and FIG. 6B is a schematic vertical cross-sectional view of the configuration shown in FIG. 6A. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In this embodiment, a joining structure 1 for an outer panel of an automobile will be described as an example of a joining structure. Examples of outer panel panels of an automobile include an outer panel of an automobile hood, an outer door panel, a roof panel, a fender panel, and a back door panel. The present disclosure may also be applied to joining structures other than automobiles.

[0022] Fig. 1 is a schematic cross-sectional view showing a joint structure 1 according to an embodiment of the present disclosure. Figs. 2A to 2C are diagrams showing an example of a manufacturing method for the joint structure 1. As shown in Fig. 1, the joint structure 1 is provided, for example, on an automobile front hood or the like provided at the front of an automobile.

[0023] The joining structure 1 includes a first member 10 located on the outside of the vehicle, a second member 20 as an inner member located opposite the first member 10 on the inside of the vehicle, and a joining portion 50 which is an adhesive that joins the first member 10 and the second member 20. The joining structure 1 has a target area A10 formed between the first member 10 and the second member 20, which includes a joining area A11 where the joining portion 50 is located and a peripheral area A12 that is the periphery of the joining area A11.

[0024] The first member 10 is, for example, a plate-shaped outer panel. The second member 20 is, for example, an inner panel, and may be a reinforcement member that supports a roof panel, a framework reinforcement member that is joined to a door outer panel, or the like.

[0025] The first member 10 is a part that constitutes part of the exterior surface of the automobile. The first member 10 is formed of a metal material such as a mild steel plate or a high-tensile steel plate. Examples of high-tensile steel plates include steel plates with a tensile strength of 340 MPa or more, such as a steel plate with a tensile strength of 590 MPa or more. The tensile strength can be measured, for example, by taking a flat portion 21 (a portion with a curvature radius of 1000 mm or more) of the first member 10 as a test piece and measuring it according to a method in accordance with JIS (Japanese Industrial Standards) Z2241 (2011). The first member 10 is formed, for example, by press-forming a steel plate. The thickness of the first member 10 (the thickness of the steel plate) is set to 0.60 mm or less, preferably 0.50 mm or less, and more preferably 0.40 mm or less. The thickness of the first member 10 is, for example, 0.30 to 0.45 mm. As described above, the thinner the thickness of the first member 10, the lighter the joining structure 1 can be.

[0026] When the first member 10 is made of an aluminum alloy, the plate thickness of the first member 10 is, for example, 0.50 to 0.80 mm.

[0027] There are no particular restrictions on the shape of the first member 10. The first member 10 is formed relatively flat, and the radius of curvature is several thousand mm or more, excluding areas with large changes in curvature such as character lines. The outer peripheral edge of the first member 10 is joined to the outer peripheral edge of the second member 20 by, for example, hemming. Figure 1 shows the central portions of the first member 10 and the second member 20, and does not show the joined portions formed by hemming or the like.

[0028] The second member 20 reinforces the first member 10 by being joined to the first member 10 via a joint 50. As a result, the second member 20 increases the surface rigidity of the first member 10, such as tension rigidity.

[0029] The tension stiffness corresponds to the sense of elastic resistance or deflection when the first member 10 is pressed by hand. This characteristic is usually expressed as the amount of deflection when a load is applied, and the smaller the amount of deflection when a certain load is applied, the higher the tension stiffness. Furthermore, the surface stiffness refers to the resistance to deformation within a certain area range of the outer panel when the first member 10 receives a load such as a vertical load from the outer surface of the first member 10.

[0030] The second member 20 is formed by, for example, pressing a metal material such as a steel plate. The thickness of the second member 20 (the thickness of the steel plate) is preferably 0.30 mm to 0.60 mm. The thickness of the second member 20 may be less than the thickness of the first member 10, may be the same as the thickness of the first member 10, or may be greater than the thickness of the first member 10.

[0031] When the second member 20 is made of an aluminum alloy, the thickness of the second member 20 is, for example, 0.50 to 1.00 mm, and may be 0.50 to 0.80 mm. In this embodiment, the direction in which the first member 10 and the second member 20 face each other, i.e., the thickness direction of the first member 10 and the second member 20, is referred to as the thickness direction Z, and a view in the thickness direction Z is simply referred to as a thickness direction view.

[0032] The second member 20 includes a flat portion 21 and a suppression portion 22 that protrudes from the flat portion 21 toward the first member 10 in the target area A10.

[0033] The flat portion 21 is a flat portion having approximately the same radius of curvature as a portion of the first member 10 facing it in the plate thickness direction Z. The flat portion 21 is not limited to being completely flat (having an infinite radius of curvature), and may be a portion having a radius of curvature of several hundred mm or more, 1000 mm or more, several thousand mm or more, or 10000 mm or more.

[0034] A seating surface 23 that comes into contact with the joint 50 is set on the upper surface of the flat portion 21 in the target area A10. The seating surface 23 is generally parallel to a portion of the underside 10a of the first member 10 that faces the seating surface 23 in the plate thickness direction Z. The seating surface 23 may be inclined with respect to the portion of the underside 10a of the first member 10 that faces the seating surface 23 in the plate thickness direction Z. A suppressing portion 22 is formed on the seating surface 23.

[0035] The suppression unit 22 is provided in a part of the target area A10 and is configured to suppress approaching between the first member 10 and the second member 20 along the plate thickness direction Z. The area of ​​the target area A10 where the joint 50 is actually arranged is the joining area A11. The peripheral area A12 is an area surrounding the joining area A11, and can also be said to be a area whose distance from the joint 50 in a direction perpendicular to the plate thickness direction Z of the first member 10 is within a range of, for example, approximately several tens of millimeters to several hundred millimeters. In this embodiment, the joining area A11 is located between the bearing surface 23 and a portion of the underside 10a of the first member 10 that faces the bearing surface 23 in the plate thickness direction Z. In this embodiment, a part of the bearing surface 23 and the suppression unit 22 are arranged in the joining area A11.

[0036] The suppression portion 22 is formed in a protruding shape that protrudes from the seating surface 23 toward the first member 10, and can be considered an embossed protrusion. The shape of the suppression portion 22 is not limited to a specific shape, as long as it protrudes from the seating surface 23 toward the first member 10. The suppression portion 22 is formed by, for example, press processing the material that will become the second member 20, and is not configured by providing a through-portion such as a slit in the material and deforming the periphery of the through-portion so that the periphery of the through-portion is raised. In other words, no portion formed by penetrating the second member 20 exists around the entire circumferential area of ​​the suppression portion 22. The suppression portion 22 may be formed in a truncated cone shape or a truncated polygonal pyramid shape. It is preferable that the tip of the suppression portion 22 is not sharp. This is because, when the first member 10 and the second member 20 are brought closer to each other, deformation due to stress concentration easily occurs in the first member 10 due to the sharpness of the suppression portion 22. That is, it is preferable that the tip of suppression portion 22 is flat. The tip of suppression portion 22 is formed, for example, by tip surface 22a, which may be flat or curved, and is preferably flat. If tip surface 22a is a curved surface that is convex toward the first member 10, the outer diameter D22 of tip surface 22a is measured at a point where outer peripheral surface 22b changes from a straight line to a curve (a point where the radius of curvature changes) when moving from the portion of suppression portion 22 that is continuous with seat surface 23 toward the first member 10 in the cross section shown in FIG.

[0037] The suppression portion 22 preferably has a tapered shape toward the first member 10. With this configuration, when the first member 10 and the second member 20 approach each other while the adhesive 40 is in a state before the joint 50 hardens, the load within the joint 50 can be smoothly distributed. In a cross section perpendicular to the thickness direction Z, the suppression portion 22 preferably has a circular shape, which allows for smooth distribution of the load within the joint 50. The height of the suppression portion 22 from the bearing surface 23 is set to, for example, about several millimeters. In a free state in which no external force is acting between the first member 10 and the second member 20 in a direction that causes them to approach each other in the thickness direction Z, the suppression portion 22 is spaced apart from the first member 10 in the thickness direction Z. In the free state, the distance D1 between the suppression portion 22 and the first member 10 in the thickness direction Z is less than the distance D2 (the height of the joint 50) between the bearing surface 23 of the second member 20 and the first member 10 in the joint region A11.

[0038] The joint 50 is an adhesive. An example of this adhesive is a mastic sealer (mastic adhesive). An example of this mastic sealer is a resin-based adhesive. The adhesive may have a property of hardening at room temperature (e.g., 20 degrees Celsius), or may have a property of hardening after undergoing a heating process or a drying process. The joint 50 is a curing adhesive that hardens after being applied to the first member 10 and the second member 20.

[0039] The joint 50 joins the seating surface 23 on which the joint 50 is provided and the underside 10a of the first member 10. The specific shape of the joint 50 is not limited as long as the joint 50 joins the first member 10 and the second member 20. The joint 50 preferably covers the entire suppression portion 22, but may also cover a portion of the suppression portion 22. In this embodiment, the joint 50 is bonded to the outer peripheral surface 22b of the suppression portion 22 and to an annular base end portion that is continuous with the seating surface 23.

[0040] The joint 50 has a constricted portion 51 midway in the plate thickness direction Z (the direction in which the first member 10 and the second member 20 face each other). As shown in FIG. 1 , the constricted portion 51 may be formed near the middle of the joint 50 in the plate thickness direction Z. As will be described later with reference to FIG. 2 , the constricted portion 51 is formed when a load F, such as high-pressure shower water for cleaning, acts on the first member 10 in the state of the adhesive 40 before the joint 50 hardens, temporarily reducing the clearance C between the first member 10 and the second member 20. The diameter of the constricted portion 51 may or may not be the smallest diameter in the joint 50. In some cases, the diameter of the joint 50 at the underside 10a of the first member 10 is larger than the diameter at the bearing surface 23. 2A, adhesive 40 that will become joint 50 is applied onto suppression portion 22, and then, when clearance C between first member 10 and second member 20 becomes small before adhesive 40 hardens to become joint 50, adhesive 40 passes over suppression portion 22 and then reaches bearing surface 23. Outer diameter D50, which is the maximum diameter of joint 50, is approximately 5 mm to 25 mm, and one example is 10 mm. Outer diameter D22 of tip surface 22a (tip) of suppression portion 22 is approximately 5 mm to 15 mm, and one example is 5 mm or 10 mm.

[0041] As shown in FIG. 1 , the outer diameter D22 of the tip surface 22a, which is the tip of the suppression portion 22, may be less than half the outer diameter D50 of the joint portion 50. In this case, the outer diameter D50 of the joint portion 50 is the maximum diameter of the joint portion 50. The joint portion 50 covers the entire tip surface 22a (tip) of the suppression portion 22. Furthermore, in a cross section perpendicular to the thickness direction Z, the shape of the constricted portion 51, where the area of ​​the joint portion 50 is smallest, is larger than the cross-sectional shape of the tip surface 22a of the suppression portion 22. In other words, the minimum outer diameter D51 of the outer peripheral surface of the constricted portion 51 is larger than the outer diameter D22 of the tip surface 22a, which is the outer diameter of the tip of the suppression portion 22. The minimum outer diameter D51 of the outer peripheral surface of the constricted portion 51 may be more than twice the outer diameter D22 of the tip surface 22a, which is the outer diameter of the tip of the suppression portion 22. Furthermore, as in this embodiment, the minimum outer diameter D51 of the outer peripheral surface of the constricted portion 51 may be larger than the outer diameter D220 of the base end 22c of the suppression portion 22. The outer peripheral surface 52 of the joint portion 50 is separated from the first member 10 and the second member 20 and is not blocked by the first member 10 or the second member 20. More specifically, the outer peripheral surface 52 of the joint portion 50 is not blocked by other members over the entire circumferential area of ​​the outer peripheral surface 52.

[0042] The above is a schematic configuration of the joint structure 1. Next, an example of a method for manufacturing the joint structure 1 will be described.

[0043] 2A, when manufacturing the joint structure 1, first, adhesive 40 that will become the joint 50 is applied to the underside 10a of the first member 10 or the suppression portion 22 of the second member 20. When applied, the adhesive 40 is viscous but not hardened.

[0044] Next, the first member 10 and the second member 20 are placed opposite each other in the plate thickness direction Z, so that the adhesive 40 comes into contact with the underside 10a of the first member 10 and at least the suppressing portion 22 of the second member 20. In this state, welding or hemming is performed to join the outer peripheral edge of the first member 10 and the outer peripheral edge of the second member 20, and the first member 10 and the second member 20 become an integrated member.

[0045] Subsequently, as shown in FIG. 2B , a large load F acts on the center of the first member 10 toward the second member 20, for example, by supplying high-pressure shower water to the upper surface 10b of the first member 10 for cleaning. This load F causes the first member 10 to bend, reducing the clearance C between the first member 10 and the second member 20. In particular, the smaller the thickness of the first member 10 is made to reduce weight, the greater the deflection of the first member 10 and the greater the reduction in the clearance C. As the clearance C decreases, the adhesive 40 is compressed between the first member 10 and the second member 20, and the adhesive 40 spreads to cover the entire suppression portion 22 and also comes into contact with the bearing surface 23 of the second member 20. At this time, the suppression portion 22 approaches or comes into contact with the first member 10, forming a path between the first member 10 and the second member 20 that can support the large load F. Therefore, the presence of the suppressing portion 22 prevents the distance between the seat surface 23 of the second member 20 and the first member 10 from becoming any smaller.

[0046] When load F is removed, for example by stopping the supply of shower water, clearance C between first member 10 and second member 20 returns to the state it was in before load F was applied, as shown in FIG. 2C. At this time, suppression unit 22 prevents clearance C between first member 10 and second member 20 from becoming excessively small, so excessive crushing of adhesive 40 does not cause a shortage of the outer periphery of adhesive 40. After load F is removed, adhesive 40 hardens through a paint baking process or the like for first member 10 and second member 20, forming joint 50.

[0047] As described above, according to this embodiment, the suppression portion 22 is formed in the target region A10, for example, in the joining region A11. This prevents the uncured adhesive 40 from being excessively crushed as the clearance C between the first member 10 and the second member 20 decreases. Therefore, the joint 50 formed by the cured adhesive 40 is also prevented from being depleted at its outer periphery. In particular, when the thickness of the first member 10 is reduced to reduce weight, depletion of the adhesive 40 (joint 50) is likely to occur due to a temporary large decrease in the clearance C. However, this configuration more reliably prevents such depletion. Therefore, the inherent joining performance of the joint 50 can be exhibited. Furthermore, the minimum outer diameter D51 of the constricted portion 51 is larger than the outer diameter D22, which is the outer diameter of the tip of the suppression portion 22. This configuration ensures a large cross-sectional area of ​​the joint 50, even at the constricted portion 51. Therefore, the inherent joining performance of the joint 50 can be exhibited.

[0048] Furthermore, in this embodiment, the suppression portion 22 is provided in a portion of the target region A10. With this configuration, when the uncured adhesive 40 spreads as the clearance C decreases, the suppression portion 22 can suppress excessive spreading of the adhesive 40. More specifically, when the uncured adhesive 40 spreads as the clearance C decreases, the presence of the suppression portion 22 allows a region where the adhesive 40 is thick to remain. This prevents the adhesive 40 from being depleted, such as from being cut, at the outer periphery when the clearance C returns to its original size. If the suppression portion 22 were not present and the area where the suppression portion 22 would be located were flat, the uncured adhesive 40 would spread excessively as the clearance C decreases. This would result in a thinner overall thickness of the adhesive 40, and the clearance C would return to its original size after the adhesive 40 thinned, causing a depletion, such as from being cut, in the adhesive 40 (bonding portion 50). According to this embodiment, the suppression section 22 can more reliably suppress the shortage of adhesive 40 described above.

[0049] Furthermore, according to the present embodiment, the suppression portion 22 protrudes from the flat portion 21 toward the first member 10 in the target area A10. With this configuration, a simple configuration in which a part of the flat portion 21 protrudes toward the first member 10 can suppress deficiency of the adhesive 40 (bonding portion 50).

[0050] Furthermore, in this embodiment, the joint 50 covers the entire suppression portion 22. With this configuration, when the adhesive 40 that forms the joint 50 is pushed out due to a temporary decrease in the clearance C, the suppression portion 22 functions as a pillar that passes through the inside of the adhesive 40. Therefore, more of the load F from the first member 10 can be borne by the suppression portion 22, and by reducing the load on the adhesive 40, it is possible to more reliably suppress depletion of the outer periphery of the adhesive 40 that forms the joint 50.

[0051] Furthermore, in this embodiment, the outer diameter D22 of the suppression portion 22 is less than half the outer diameter D50 of the joint portion 50. With this configuration, a space can be secured around the outer periphery of the suppression portion 22 for the adhesive 40 to be appropriately expanded when the clearance C temporarily decreases. This prevents the adhesive 40 from being excessively crushed. As a result, it is possible to prevent the outer periphery of the joint portion 50 from becoming depleted.

[0052] Furthermore, in this embodiment, the outer peripheral surface 52 of the joint 50 is spaced apart from the first member 10 and the second member 20. With this configuration, when the clearance C temporarily decreases, the deformation of the adhesive 40 is not hindered by the first member 10 and the second member 20. This makes it possible to prevent the outer peripheral portion of the adhesive 40 (joint 50) from being damaged and causing defects.

[0053] Furthermore, in this embodiment, the first member 10 is an outer panel of an automobile, the second member 20 is an inner member joined to the outer panel by a joint 50, and the suppression portion 22 is provided on the inner member. With this configuration, it is possible to reduce the thickness of the outer panel to achieve a lighter automobile, while suppressing a shortage of adhesive 40 at the outer periphery due to a temporary decrease in clearance C, thereby increasing the support rigidity of the joint 50 and further increasing the tensile rigidity of the first member 10, which is the outer panel.

[0054] The embodiments of the present disclosure have been described above. However, the present disclosure is not limited to the above-described embodiments. Various modifications of the present disclosure are possible within the scope of the claims. Note that the following mainly describes configurations that differ from the above-described embodiments and modifications, and similar configurations are designated by similar reference numerals and detailed description thereof is omitted.

[0055] <Variation 1> In the above embodiment, an example has been described in which the seat surface 23 and the suppression portion 22 are formed on the flat portion 21. However, this is not necessarily the case. Fig. 3 is a cross-sectional view of the main portion of Modification 1. As shown in Fig. 3, a convex seat 24 may be formed on the flat portion 21, and the suppression portion 22 may be formed on this convex seat 24.

[0056] In this case, the second member 20 includes a flat portion 21, a convex pedestal 24 that protrudes from the flat portion 21 toward the first member 10 in the target area A10, and a suppression portion 22 formed on the convex pedestal 24.

[0057] The convex base 24 is formed in a shape that is convex from the flat portion 21 toward the first member 10 side. The shape of the convex base 24 is not limited to a specific shape as long as it is formed in a shape that is convex from the flat portion 21 toward the first member 10 side. The convex base 24 may be formed in a truncated cone shape or a truncated polygonal pyramid shape. A seat surface 23 that comes into contact with the joint portion 50 is formed on the upper surface of the convex base 24.

[0058] According to this modification 1, the provision of the convex seat 24 on the second member 20 can further increase the bending rigidity and torsional rigidity of the second member 20. As a result, the bending rigidity and torsional rigidity of the first member 10 and the second member 20 supported by the second member 20 as a whole can be further increased.

[0059] <Variation 2> 4A and 4B are cross-sectional views of the main part of Modification 2, in which Fig. 4A shows the completed state of joint structure 1 and Fig. 4B shows the state during the manufacturing of joint structure 1. As shown in Fig. 4A, a recessed seat 25 may be formed in flat portion 21, and suppression portion 22 may be formed in this recessed seat 25.

[0060] In this case, the second member 20 includes a flat portion 21, a recessed seat 25 recessed from the flat portion 21 in the target area A10, and a suppression portion 22 formed in the recessed seat 25.

[0061] The recessed seat 25 is formed in a shape recessed in a direction away from the first member 10. The specific shape of the recessed seat 25 is not limited as long as the flat portion 21 is recessed in the plate thickness direction Z. The recessed seat 25 may be formed in a truncated cone shape or a truncated polygonal pyramid shape. A seat surface 23 that comes into contact with the joint 50 is formed on the bottom surface of the recessed seat 25. The suppression portion 22 is disposed in the joint region A11 of the target region A10, and protrudes from the recessed seat 25 of the second member 20 toward the first member 10. The width of the recessed seat 25 (the length in the direction perpendicular to the plate thickness direction Z) is set to a wide value of, for example, 100 mm or more, and the distance to adjacent joints 50 (not shown) is large.

[0062] The height H22 of the suppression portion 22 is less than the depth H25 of the recessed seat 25. As a result, the suppression portion 22 is located further back (lower) than the flat portion 21. The clearance C between the first member 10 and the second member 20 is the clearance between the lower surface 10a of the first member 10 and the tip surface 22a, which is the tip of the suppression portion 22. The clearance C may be larger than the difference (H25-H22) between the depth H25 of the recessed seat 25 and the height H22 of the suppression portion 22.

[0063] Furthermore, the clearance C (the distance between the lower surface 10a of the first member 10 and the tip surface 22a, which is the tip of the suppression portion 22) is larger than the clearance E between the lower surface 10a of the first member 10 and the upper surface 21a of the flat portion 21 of the second member 20. It is preferable that the clearance C is at least twice the clearance E. The reason for this is that when the gap between the first member 10 and the second member 20 becomes smaller, a larger area can be secured into which the deformed portion of the adhesive 40 (joint portion 50) can escape.

[0064] Even with this configuration, during manufacturing of the joined structure 1, a large load F may act on the center of the first member 10 toward the second member 20, for example, when high-pressure shower water is supplied to the upper surface 10b of the first member 10 for cleaning. This load F reduces the clearance C between the first member 10 and the second member 20, as shown in FIG. 4B . As a result, the adhesive 40 disposed between the first member 10 and the suppression portion 22 is compressed between the first member 10 and the second member 20, expands to cover the entire suppression portion 22, and also comes into contact with the bearing surface 23 of the second member 20. At this time, as the suppression portion 22 approaches or comes into contact with the first member 10, a path capable of supporting the large load F is formed between the first member 10 and the second member 20. This prevents the clearance C between the first member 10 and the second member 20 from becoming excessively small.

[0065] As described above, according to the configuration of Modification 2, the suppression portion 22 is formed in the recessed seat 25 of the second member 20 and protrudes from the second member 20 toward the first member 10. According to this configuration, the provision of the recessed seat 25 in the second member 20 can further increase the bending rigidity and torsional rigidity of the second member 20. As a result, the bending rigidity and torsional rigidity of the first member 10 and the second member 20 as a whole, which are supported by the second member 20, can further increase.

[0066] Alternatively, the convex pedestal 24 shown in the first modified example may be formed on the concave pedestal 25, and the suppression portion 22 may be formed on this convex pedestal 24.

[0067] <Variation 3> 5A and 5B are cross-sectional views of the main part of Modification 3, in which Fig. 5A shows the completed state of joint structure 1 and Fig. 5B shows the state during the manufacturing of joint structure 1. As shown in Fig. 5A, a recessed seat 25 may be formed in flat portion 21, and suppression portion 22 may be formed in flat portion 21 in peripheral region A12 of this recessed seat 25.

[0068] In this case, the second member 20 includes a flat portion 21, a recessed seat 25 recessed from the flat portion 21 in the target area A10, and a suppression portion 22 formed on the flat portion 21.

[0069] In Modification 3, the suppression portion 22 is disposed in the peripheral region A12 of the target region A10, and protrudes from the flat portion 21 of the second member 20 toward the first member 10. The width of the recessed base 25 (the length in the direction perpendicular to the plate thickness direction Z) is set to a relatively small value of, for example, several tens of mm or more. It is preferable that a plurality of suppression portions 22 are provided in the circumferential direction of the recessed base 25. The suppression portions 22 are spaced apart from the joint portion 50 and are not in contact with the joint portion 50.

[0070] Even with this configuration, when manufacturing the joined structure 1, a large load F is applied to the center of the first member 10 toward the second member 20, as shown in FIG. 5B , for example, by supplying high-pressure shower water for cleaning to the upper surface 10b of the first member 10. This load F reduces the clearance C between the first member 10 and the second member 20. As a result, the adhesive 40 is compressed between the first member 10 and the second member 20. At this time, the suppression portion 22 comes into contact with the first member 10, forming a path between the first member 10 and the second member 20 that can support the large load F. This prevents the clearance C between the first member 10 and the second member 20 from becoming excessively small.

[0071] <Variation 4> In the above-described embodiments and modifications, the description has been primarily focused on one joint 50. In these embodiments and modifications, a plurality of joints 50 may be arranged side by side. Fig. 6A is a plan view of the main part of Modification 4 showing a configuration in which a plurality of joints 50 are arranged side by side, and Fig. 6B is a schematic vertical cross-sectional view of the configuration shown in Fig. 6A.

[0072] As shown in FIGS. 6A and 6B , a plurality of bonding portions 50 may be arranged side by side on a single convex pedestal 26. The convex pedestal 26 is formed on the second member 20. The convex pedestal 26 is formed, for example, in the shape of a hexagonal truncated pyramid, with a through-hole 26a formed in the upper portion. The plurality of convex pedestals 26 are arranged, for example, in a close-packed arrangement, and a flat portion 21 is formed on the upper surface of each convex pedestal 26. In this case, the flat portion 21 has a hexagonal annular surface. A plurality of bonding portions 50 are arranged side by side on each flat portion 21. For example, one bonding portion 50 and one suppressing portion 22 are formed on each side of the flat portion 21, and the suppressing portion 22 is arranged in the bonding region A11. With this arrangement, the plurality of bonding portions 50 are arranged in a ring shape.

[0073] In this way, by providing a plurality of joints 50 in a line, the support rigidity of the first member 10 can be increased, and therefore the tensile rigidity of the first member 10 can be increased.

[0074] Furthermore, since the plurality of joints 50 are arranged in a ring shape, the support rigidity of the first member 10 can be increased, and therefore the tensile rigidity of the first member 10 can be increased.

[0075] The convex pedestal 26 is not limited to a hexagonal truncated pyramid, but may be a polygonal truncated pyramid shape other than a hexagon, or may be a truncated cone shape. The convex pedestals 26 do not have to be arranged in a close-packed manner. The convex pedestal 26 may have a joining structure such as that of Modifications 2 and 3. [Industrial Applicability]

[0076] The present disclosure is widely applicable to joining structures. [Explanation of symbols]

[0077] 1 Joint structure 10 First member 20 Second member 21 Flat area 22 Suppression part 24 Convex pedestal 25 Concave pedestal 26 Convex pedestal 50 Joint 51 Waist A10 Target Area A11 Joint area A12 Surrounding Area D22 Outer diameter of the tip of the suppression part D51 Minimum outer diameter of neck

Claims

1. A first member; a second member disposed opposite the first member; A joining structure including a joining portion that joins the first member and the second member by adhesion, a suppression unit that suppresses approach of the first member and the second member in a target area including a joint area where the joint is arranged and a peripheral area around the joint area; the suppression portion protrudes from the second member toward the first member, the joint portion has a constricted portion midway in a direction in which the first member and the second member face each other, the minimum outer diameter of the constricted portion is larger than the outer diameter of the tip of the suppression portion, the second member includes a flat portion and a recessed seat recessed from the flat portion in the target area; the suppression portion protrudes from the flat portion toward the first member in the target region, A joining structure in which the joining portion is joined to the recessed base and the first member, and is spaced apart from the suppression portion.

2. The joint structure according to claim 1 , wherein the suppression portion is provided in a part of the target region.

3. The joint structure according to claim 1 , wherein the joint portion covers the entirety of the suppression portion.

4. The joint structure according to claim 1 , wherein the outer diameter of the suppression portion is equal to or less than half the outer diameter of the joint portion.

5. The joint structure according to claim 1 , wherein a plurality of the joint portions are arranged side by side.

6. The joint structure according to claim 5 , wherein the plurality of joints are arranged in an annular shape.

7. The joint structure according to claim 1 , wherein an outer peripheral surface of the joint portion is spaced apart from the first member and the second member.

8. the first member is an outer panel of an automobile, the second member is an inner member joined to the outer panel by the joining portion, The joining structure according to claim 1 , wherein the suppressing portion is provided on the inner member.

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