JP7543766B2 - Joining method and joining structure - Google Patents

Description

The present invention relates to a joining method and a joining structure.

Large structures are sometimes constructed by joining two components. When joining two components with structural connecting members such as bolts or welds, the strength of the joint becomes an issue. In addition, when joining two components with structural connecting members such as bolts or welds, the structural connecting members protrude to the outside, which may impair the aesthetic appearance.

JP 2014-98300 A Utility Model Publication No. 63-28715 JP 2015-118535 A

Instead of joining two components using structural joining members such as bolts or welds, a convex mating portion may be formed on one component and a concave mating portion may be formed on the other component, and the mating portions may be mated together to join the two components. However, in this case, there is a risk that the strength of the joint may be reduced in response to a force applied in the direction of mating the mating portions.

The present invention aims to improve the strength of a joint when two components are joined by engaging a mating portion.

The main object of the present invention to achieve this object is to
A method for joining a first member and a second member, comprising the steps of:
The first member has a first fitting portion having a first length in a first direction and a first opposing surface,
the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface,
a first sliding step of sliding only the first member of the first member and the second member in a second direction different from the first direction, or sliding only the second member in a direction opposite to the second direction, thereby causing the first opposing surface and the second opposing surface to face each other over a predetermined length in the second direction;
a second sliding step in which, after the first sliding step , only the first member of the first member and the second member is slid in a direction opposite to the first direction or only the second member is slid in the first direction, thereby fitting the first fitting portion and the second fitting portion together and forming a cavity portion having a second length longer than the first length in the first direction between the first opposing surface and the second opposing surface;
an inserting step of inserting a plug member into the cavity;
having
The first member has a non-through hole having an abutment portion,
This joining method is characterized in that in the first sliding step, of the first member and the second member, only the first member is slid in the second direction, or only the second member is slid in a direction opposite to the second direction, until the end of the second member abuts the abutment portion of the first member .

According to the present invention, when two components are joined by fitting the fitting parts together, the strength of the joint can be improved.

Fig. 1A is an exploded explanatory view of a joint structure 100 according to a first embodiment. Fig. 1B is an explanatory view of a joint state of the joint structure 100 according to the first embodiment. FIG. 2A is an explanatory diagram of a first sliding step of the joining method according to the first embodiment. FIG. 2B is an explanatory diagram of a second sliding step of the joining method according to the first embodiment. FIG. 2C is an explanatory diagram of an inserting step of the joining method according to the first embodiment. Fig. 3A is an exploded explanatory view of the joint structure 100 according to the second embodiment. Fig. 3B is an explanatory view of the joint state of the joint structure 100 according to the second embodiment. FIG. 4A is an explanatory diagram of a first sliding step of the joining method according to the second embodiment. FIG. 4B is an explanatory diagram of the state immediately after the first slide step of the joining method according to the second embodiment. FIG. 4C is an explanatory diagram of a second sliding step of the joining method according to the second embodiment. FIG. 4D is an explanatory diagram of an inserting step of the joining method according to the second embodiment. FIG. 5 is an explanatory diagram of a modified example of the second embodiment. 6A to 6D are explanatory diagrams of another modified example of the second embodiment.

At least the following points become clear from the description and drawings described below.

A joining method for joining a first member and a second member, the first member having a first fitting portion having a first length in a first direction and a first opposing surface, the second member having a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface, a first sliding step in which the first member and the second member are slid in a second direction different from the first direction to make the first opposing surface and the second opposing surface face each other over a predetermined length in the second direction, a second sliding step in which the first member and the second member are slid in the first direction after the first sliding step to fit the first fitting portion and the second fitting portion and form a cavity portion between the first opposing surface and the second opposing surface with a second length longer than the first length in the first direction, and an insertion step in which a plug member is inserted into the cavity are performed. Such a joining method improves the strength of the joint.

In the first sliding step, it is desirable to slide the first member and the second member in the second direction while the first opposing surface and the second opposing surface are in contact with each other. This allows the first member and the second member to be guided in the second direction by the first opposing surface and the second opposing surface.

It is desirable that the first member has a non-through hole with an abutment portion, and in the first sliding step, the first member and the second member are slid in the second direction until the end of the second member abuts against the abutment portion of the first member. This allows the first member and the second member to slide to an appropriate position in the second direction.

The first member has a first protruding portion protruding in the first direction and a first receiving portion, and the second member has a second protruding portion protruding in the first direction and positioned inside the first receiving portion, and a second receiving portion on the inside of which the first protruding portion is positioned. In the second sliding step, it is desirable to position the first protruding portion on the second receiving portion and position the second protruding portion on the first receiving portion by sliding the first member and the second member in the first direction. This improves the strength of the joint.

After the first sliding step, when the first opposing surface and the second opposing surface are in contact with each other, it is desirable that the tip of the first protrusion is placed in the second receiving portion and the tip of the second protrusion is placed in the first receiving portion. This can prevent incorrect procedures from occurring.

It is desirable to construct the first member and the second member using a 3D printer. This is particularly effective in such cases.

A joining structure comprising a first member, a second member, and a plug member is disclosed, characterized in that the first member has a first fitting portion having a first length in a first direction and a first opposing surface, the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface, the first fitting portion and the second fitting portion are fitted from the first direction, the first opposing surface and the second opposing surface are opposed to each other over a predetermined length in a second direction different from the first direction, and are arranged in the first direction with a second length longer than the first length therebetween, and the plug member is arranged in a cavity between the first opposing surface and the second opposing surface. Such a joining structure improves the joining strength of the joint.

It is desirable that the first member has a non-through hole with an abutment portion, and that the end of the second member abuts against the abutment portion of the first member. This results in a configuration in which the first member and the second member can be slid to an appropriate position in the second direction.

The first member has a first protruding portion protruding in the first direction and a first receiving portion,
It is preferable that the second member has a second protruding portion that protrudes in the first direction and is disposed inside the first receiving portion, and a second receiving portion that is disposed inside the first protruding portion, thereby improving the joining strength of the joint.

When the first opposing surface and the second opposing surface are in contact with each other, it is desirable that the first tip of the first protrusion is disposed in the second receiving portion and the second tip of the second protrusion is disposed in the first receiving portion. This makes it possible to prevent the first member and the second member from being joined in an incorrect procedure.

It is desirable that the first protruding portion and the second protruding portion are configured so that their widths narrow toward the tip end side in the first direction, and that the first receiving portion and the second receiving portion are configured so that their widths narrow toward the base end side in the first direction. This allows the first fitting portion and the second fitting portion to be smoothly fitted together.

It is desirable that the first and second protruding parts have curved surfaces, the first and second receiving parts have curved surfaces, the curved surface of the first protruding part contacts the curved surface of the second receiving part, and the curved surface of the second protruding part contacts the curved surface of the first receiving part, and that the first and second parts are joined together in this state. This improves the strength of the joint.

It is desirable that the plug member has a protrusion on the side surface facing the first opposing surface and the second opposing surface. This makes it difficult for the plug member to come off.

First Embodiment
Fig. 1A is an exploded explanatory view of a joint structure 100 according to a first embodiment. Fig. 1B is an explanatory view of a joint state of the joint structure 100 according to the first embodiment.

The joining structure 100 of the first embodiment has a first member 10, a second member 20, and a plug member 30. By joining the first member 10 and the second member 20, a large structure can be constructed.

The first member 10 and the second member 20 are members constructed, for example, by a 3D printer. By joining two members as in this embodiment, it becomes possible to manufacture large structures that exceed the size that can be formed by a 3D printer. A 3D printer can form the first member 10 and the second member 20 from materials such as resin and metal. When constructing the first member 10 and the second member 20 from resin, it is desirable to use a fiber-reinforced resin that contains carbon fiber or the like. However, the first member 10 and the second member 20 are not limited to members constructed by a 3D printer, and may be constructed, for example, from wood.

The first member 10 is one of the two members that make up the joining structure 100. The first member 10 has a first fitting portion 11, a first contact surface 12, and a first opposing surface 13.

The first fitting portion 11 is a portion that fits into the second fitting portion 21 of the second member 20. The first fitting portion 11 is configured as a convex portion or a concave portion. Here, the first fitting portion 11 is configured as a concave portion. The length of the first fitting portion 11 in the X direction (corresponding to the first direction) is L1 (corresponding to the first length).

The first contact surface 12 is a surface that comes into contact with the second contact surface 22 of the second member 20 when in a joined state. The first contact surface 12 is a surface perpendicular to the X direction (corresponding to the first direction). The first contact surface 12 is a surface that faces the second contact surface 22 of the second member 20 in the X direction. The above-mentioned first fitting portion 11 is a portion that is recessed in the X direction by a length L1 with respect to the first contact surface 12.

The first opposing surface 13 is a surface facing the second opposing surface 23 of the second member 20. The plug member 30 is inserted into a hollow portion 40 formed between the first opposing surface 13 and the second opposing surface 23 of the second member 20. The first opposing surface 13 is a surface parallel to the Y direction (corresponding to the second direction). The first member 10 and the second member 20 can be slid relatively in the Y direction (corresponding to the second direction) while the second member 20 (more specifically, the second opposing surface 23 of the second member 20) is in contact with the first opposing surface 13 (described later). In other words, the first opposing surface 13 also functions as a guide surface that guides the first member 10 and the second member 20 in the Y direction.

In the first embodiment, a non-through hole 14 is formed in the first member 10, and a first contact surface 12 and a first opposing surface 13 are arranged at the opening of the non-through hole 14. An abutting portion 15 is formed at the bottom of the non-through hole 14. The abutting portion 15 is a portion that abuts the second member 20 (specifically, the end portion 25). In other words, the abutting portion 15 functions as an abutting surface against which the second member 20 abuts (described later). When the length (thickness) of the first member 10 in the Y direction is D0 and the length in the Y direction from the opening of the non-through hole 14 of the first member 10 to the abutting portion 15 (depth of the non-through hole 14) is D1, the length D1 is smaller than the length D0. By forming the non-through hole 14 of the first member 10 in this way (by the first member 10 having the abutting portion 15), a structure in which the joint is not exposed from the opposite side of the first member 10 can be realized.

In addition, in the first embodiment, since the first fitting portion 11 is configured as a recess, the area of the abutment portion 15 is larger than the area of the opening of the non-through hole 14. Normally, it is difficult to form a non-through hole 14 that is larger on the back side, but in this embodiment, since the first member 10 is formed by a 3D printer, it is easy to form a non-through hole 14 with such a shape.

The second member 20 is a member that is joined to the first member 10. In other words, the second member 20 is the other of the two members that make up the joining structure 100. The second member 20 has a second fitting portion 21, a second contact surface 22, and a second opposing surface 23.

The second fitting portion 21 is a portion that fits with the first fitting portion 11 of the first member 10. The second fitting portion 21 is configured as a recess or a protrusion. The second fitting portion 21 is configured as a recess when the first fitting portion 11 is a protrusion, and is configured as a protrusion when the first fitting portion 11 is a recess. Here, since the first fitting portion 11 is configured as a recess, the second fitting portion 21 is configured as a protrusion. The length of the second fitting portion 21 in the X direction (corresponding to the first direction) is L1 (corresponding to the first length). The second fitting portion fits with the first fitting portion 11 from the X direction.

The second contact surface 22 is a surface that comes into contact with the first contact surface 12 of the first member 10 when in a joined state. The second contact surface 22 is a surface perpendicular to the X direction (corresponding to the first direction). The second contact surface 22 is a surface that faces the first contact surface 12 of the first member 10 in the X direction. The aforementioned second fitting portion 21 is a portion that protrudes from the second contact surface 22 in the X direction by a length L1.

The second opposing surface 23 is a surface facing the first opposing surface 13 of the first member 10. As already described, the plug member 30 is inserted into the cavity 40 formed between the second opposing surface 23 and the first opposing surface 13. The second opposing surface 23 is a surface parallel to the Y direction (corresponding to the second direction) and is a surface parallel to the first opposing surface 13. The first member 10 and the second member 20 can be slid relatively in the Y direction (corresponding to the second direction) while the first member 10 (more specifically, the first opposing surface 13 of the first member 10) is in contact with the second opposing surface 23 (described later). In other words, the second opposing surface 23 also functions as a guide surface that guides the first member 10 and the second member 20 in the Y direction. The second opposing surface 23 faces the first opposing surface 13 over a predetermined length in the Y direction (here, length D1). Additionally, the second opposing surface 23 is disposed at a distance of length L2 from the first opposing surface 13 in the X direction.

The plug member 30 is a member that is inserted between the first opposing surface 13 and the second opposing surface 23. By inserting the plug member 30 between the first opposing surface 13 and the second opposing surface 23, the first member 10 and the second member 20 are prevented from shifting in the X direction (first direction). Here, the plug member 30 is configured in a rectangular parallelepiped shape, but the shape of the wire member is not limited to this and may be, for example, wedge-shaped. The length in the X direction of the plug member 30 is L2 (corresponding to the second length). The length L2 in the X direction of the plug member 30 is longer than the length L1 in the X direction of the first fitting portion 11 and the second fitting portion 21.

Figures 2A to 2C are explanatory diagrams of the joining method of the first embodiment.

As shown in FIG. 2A, the first member 10 and the second member 20 are brought close to each other in the Y direction (corresponding to the second direction), and the end 25 of the second member 20 is inserted into the non-through hole 14 of the first member 10. At this time, the first member 10 and the second member 20 are slid relatively in the Y direction (corresponding to the second direction) while the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20 are in contact with each other. As a result, the first opposing surface 13 and the second opposing surface 23 are arranged opposite each other over a predetermined length in the Y direction (here, length D1). Sliding the first member 10 and the second member 20 in the Y direction (corresponding to the second direction) is sometimes called the "first slide step."

In the first embodiment, the first member 10 and the second member 20 are slid relatively in the Y direction (corresponding to the second direction) until the end 25 of the second member 20 abuts against the abutting portion 15 of the first member 10. This allows the first member 10 and the second member 20 to slide in the Y direction (corresponding to the second direction) to an appropriate position in the Y direction.

After the end 25 of the second member 20 hits the abutment portion 15 of the first member 10, the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction) as shown in FIG. 2B. At this time, the direction in which the first member 10 and the second member 20 are slid (X direction) is different from the direction (Y direction) shown in FIG. 2A. Sliding the first member 10 and the second member 20 in the X direction (corresponding to the first direction) is sometimes called the "second slide step."

In the first embodiment, the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction) until the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 come into contact with each other. This causes the first fitting portion 11 of the first member 10 to fit into the second fitting portion 21 of the second member 20. In other words, the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction) until the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 fit into each other. In addition, the amount of sliding between the first member 10 and the second member 20 in the X direction (corresponding to the first direction) required from a state in which the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20 are in contact with each other until the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 come into contact with each other (in other words, until the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 are fitted together) corresponds to length L2, which is longer than length L1 (the length in the X direction of the first fitting portion 11 and the second fitting portion 21). When the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 are in contact with each other, as shown in FIG. 2C, the second opposing surface 23 is disposed at a distance of length L2 from the first opposing surface 13 in the X direction, thereby forming a cavity 40 of length L2 between the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20.

After the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 are brought into contact with each other, in other words, after the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 are fitted together, as shown in FIG. 2C, the plug member 30 is inserted into the cavity 40 between the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20. Note that inserting the plug member 30 into the cavity 40 is sometimes called an "insertion step". The plug member 30 is inserted into the cavity 40 from the Y direction (second direction). By inserting the plug member 30, the first member 10 and the second member 20 are prevented from shifting in the X direction (first direction), and the fit between the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 is maintained. The plug member 30 is inserted into the cavity 40, thereby joining the first member 10 and the second member 20.

As described above, the joining method of the first embodiment joins a first member 10 and a second member 20. Here, the first member 10 has a first fitting portion 11 having a length L1 (corresponding to a first length) in the X direction (corresponding to a first direction), and a first opposing surface 13. Also, the second member 20 has a second fitting portion 21 that fits with the first fitting portion 11, and a second opposing surface 23 that faces the first opposing surface 13. Then, a first sliding step is performed in which the first member 10 and the second member 20 are slid in the Y direction (corresponding to a second direction different from the first direction). In addition, after the first sliding step, the first member 10 and the second member 20 are slid in the X direction (corresponding to the first direction) to fit the first fitting portion 11 and the second fitting portion 21, and a second sliding step is performed to form a cavity portion 40 of length L2 (corresponding to a second length longer than the first length) between the first opposing surface 13 and the second opposing surface 23. In addition, after the second sliding step, an insertion step is performed to insert the plug member 30 into the cavity portion 40. According to the joining method of the first embodiment, after the first member 10 and the second member 20 are fitted by sliding in different directions, the first member 10 and the second member 20 are fixed by the plug member 30 so that the fitting between them is not released, so that the first member 10 and the second member 20 are not easily released, and the strength of the joint is improved.

Second Embodiment
Fig. 3A is an exploded explanatory view of the joint structure 100 of the second embodiment. Fig. 3B is an explanatory view of the joint state of the joint structure 100 of the second embodiment. The joint structure 100 of the second embodiment is a structure that improves on the so-called ferrule joint.

The joining structure 100 of the second embodiment has a first member 10, a second member 20, and a plug member 30, similar to the first embodiment. In the second embodiment, the first member 10 and the second member 20 are also members made by, for example, a 3D printer. However, the first member 10 and the second member 20 are not limited to members made by a 3D printer, and may be made of, for example, wood.

The first member 10 is one of the two members that make up the joining structure 100. As in the first embodiment, the first member 10 has a first fitting portion 11, a first contact surface 12, and a first opposing surface 13. In addition, the first member 10 in the second embodiment has a first protruding portion 16 and a first receiving portion 17.

The first fitting portion 11 is a portion that fits with the second fitting portion 21 of the second member 20. The first fitting portion 11 is composed of a convex portion or a concave portion. In the second embodiment, the first member 10 has two first fitting portions 11. Thus, the number of first fitting portions 11 that the first member 10 has is not limited to one, but may be two or more. Of the two first fitting portions 11, one first fitting portion 11 is arranged adjacent to the first protrusion 16 (more specifically, arranged on the outer side of the first protrusion 16 in the Z direction), and the other first fitting portion 11 is arranged adjacent to the first receiving portion 17 (more specifically, arranged on the outer side of the first receiving portion 17 in the Z direction). Of the two first fitting portions 11, one first fitting portion 11 (the first fitting portion 11 adjacent to the first protrusion 16) is configured as a convex portion, and the other first fitting portion 11 (the first fitting portion 11 adjacent to the first receiving portion 17) is configured as a concave portion. However, the concave and convex portions of the two first fitting portions 11 may be reversed, both first fitting portions 11 may be configured as convex portions, or both first fitting portions 11 may be configured as concave portions. Note that, even in the second embodiment, the length of the first fitting portion 11 in the X direction (corresponding to the first direction) is L1 (corresponding to the first length).

The first contact surface 12 is a surface that comes into contact with the second contact surface 22 of the second member 20 in the joined state. The first contact surface 12 is a surface perpendicular to the X direction (corresponding to the first direction). The first contact surface 12 is a surface that faces the second contact surface 22 of the second member 20 in the X direction. In the second embodiment, the first member 10 has two first contact surfaces 12. Thus, the number of first contact surfaces 12 that the first member 10 has is not limited to one, but may be two or more. Of the two first contact surfaces 12, one contact surface is arranged adjacent to the first protrusion 16 (more specifically, arranged on the outer side of the first protrusion 16 in the Z direction), and the other first contact surface 12 is arranged adjacent to the first receiving portion 17 (more specifically, arranged on the outer side of the first receiving portion 17 in the Z direction). In the second embodiment, each of the first fitting portions 11 is a portion that protrudes or is recessed by a length L1 in the X direction relative to the first contact surface 12. As described below, the first member 10 does not have to have a first contact surface 12 that is perpendicular to the X direction.

The first opposing surface 13 is a surface facing the second opposing surface 23 of the second member 20. The plug member 30 is inserted into a hollow portion 40 formed between the first opposing surface 13 and the second opposing surface 23 of the second member 20. The first opposing surface 13 is a surface parallel to the Y direction (corresponding to the second direction). The first member 10 and the second member 20 can be slid relatively in the Y direction (corresponding to the second direction) while the second member 20 (more specifically, the second opposing surface 23 of the second member 20) is in contact with the first opposing surface 13 (described later). That is, even in the second embodiment, the first opposing surface 13 also functions as a guide surface that guides the first member 10 and the second member 20 in the Y direction. The first opposing surface 13 is disposed between the two first fitting portions 11 in the Z direction. The first opposing surface 13 is disposed between the two first contact surfaces 12 in the Z direction. Additionally, the first opposing surface 13 is disposed between the first protrusion 16 and the first receiving portion 17 in the X direction.

The first protrusion 16 is a portion to be placed inside the second receiving portion 27 of the second member 20. In other words, the first protrusion 16 is a portion to be inserted into the second receiving portion 27 of the second member 20. The first protrusion 16 is a portion provided at the end of the first member 10 in the X direction. The first protrusion 16 is a portion that protrudes in the X direction relative to the first contact surface 12. The first protrusion 16 is configured so that its width (dimension in the Z direction) narrows toward the tip side in the X direction. The side surface of the first protrusion 16 is disposed opposite the inner surface of the second receiving portion 27. In addition, the first tip 16A, which is the tip of the first protrusion 16, is configured as a rounded curved surface. In this embodiment, since the first member 10 is formed by a 3D printer, it is easy to form a curved surface on the first tip 16A of the first protrusion 16. The first protrusion 16 is disposed adjacent to the first fitting portion 11 (specifically, disposed on the inside of the first fitting portion 11 in the Z direction). The length (protrusion amount) of the first protrusion 16 relative to the first contact surface 12 is L3 (corresponding to the third length). The length L3 of the first protrusion 16 in the X direction is longer than the length L1 of the first fitting portion 11 in the X direction. In addition, the length L3 of the first protrusion 16 in the X direction is longer than the length L2 of the plug member 30 in the X direction.

The first receiving portion 17 is a portion that positions the second protrusion 26 of the second member 20 on the inside. In other words, the first receiving portion 17 is a portion that receives the second protrusion 26 of the second member 20. The first receiving portion 17 is a portion that is recessed toward the base end side in the X direction with respect to the first contact surface 12. The first receiving portion 17 is configured so that the width (dimension in the Z direction) becomes narrower toward the base end side in the X direction. The inner surface of the first receiving portion 17 is disposed opposite the side surface of the second protrusion 26. In addition, the inner surface of the first receiving portion 17 on the base end side in the X direction is configured as a rounded curved surface. In this embodiment, since the first member 10 is formed by a 3D printer, it is easy to form a curved surface on the inner surface of the base end side in the X direction of the first receiving portion 17. The first receiving portion 17 is a portion that is provided on the base end side in the X direction of the first member 10 relative to the first opposing surface 13. The first receiving portion 17 is provided closer to the base end of the first member 10 in the X direction than the first protruding portion 16, and the first opposing surface 13 is disposed between the first receiving portion 17 and the first protruding portion 16. The first receiving portion 17 is disposed adjacent to the first fitting portion 11 (more specifically, disposed on the inside of the first fitting portion 11 in the Z direction). Here, the length (recess amount) of the first receiving portion 17 relative to the first contact surface 12 is L3.

The second member 20 is a member that is joined to the first member 10. In other words, the second member 20 is the other of the two members that make up the joining structure 100. As in the first embodiment, the second member 20 has a second fitting portion 21, a second contact surface 22, and a second opposing surface 23. In addition, the second member 20 of the second embodiment has a second protruding portion 26 and a second receiving portion 27.

The second fitting portion 21 is a portion that fits with the first fitting portion 11 of the first member 10. The second fitting portion 21 is configured as a recess or a protrusion. The second fitting portion 21 is configured as a recess when the first fitting portion 11 is a protrusion, and is configured as a protrusion when the first fitting portion 11 is a recess. The number of second fitting portions 21 that the second member 20 has is the same as the number of first fitting portions 11 that the first member 10 has. Therefore, here, the second member 20 has two second fitting portions 21. Of the two first fitting portions 11, one second fitting portion 21 is arranged adjacent to the second protrusion 26 (more specifically, arranged on the outer side of the second protrusion 26 in the Z direction), and the other second fitting portion 21 is arranged adjacent to the second receiving portion 27 (more specifically, arranged on the outer side of the second receiving portion 27 in the Z direction). Of the two second fitting portions 21, one second fitting portion 21 (the second fitting portion 21 adjacent to the second protrusion 26) is configured as a convex portion, and the other second fitting portion 21 (the second fitting portion 21 adjacent to the second receiving portion 27) is configured as a concave portion. However, the concaves and convexes of the two second fitting portions 21 may be reversed, both second fitting portions 21 may be configured as convex portions, or both second fitting portions 21 may be configured as concave portions. Note that, even in the second embodiment, the length of the second fitting portion 21 in the X direction (corresponding to the first direction) is L1 (corresponding to the first length). The second fitting portion 21 fits into the first fitting portion 11 from the X direction.

The second contact surface 22 is a surface that comes into contact with the first contact surface 12 of the first member 10 when in a joined state. The second contact surface 22 is a surface perpendicular to the X direction (corresponding to the first direction). The second contact surface 22 is a surface that faces the first contact surface 12 of the first member 10 in the X direction. The number of second contact surfaces 22 that the second member 20 has is the same as the number of first contact surfaces 12 that the first member 10 has. Therefore, here, the second member 20 has two second contact surfaces 22. Of the two second contact surfaces 22, one second contact surface 22 is arranged adjacent to the second protrusion 26 (more specifically, arranged on the outer side of the second protrusion 26 in the Z direction), and the other second contact surface 22 is arranged adjacent to the second receiving portion 27 (more specifically, arranged on the outer side of the second receiving portion 27 in the Z direction). In the second embodiment, each second fitting portion 21 is a portion that protrudes or is recessed by a length L1 in the X direction relative to the second contact surface 22. As described below, the second member 20 does not have to have a second contact surface 22 that is perpendicular to the X direction.

The second opposing surface 23 is a surface facing the first opposing surface 13 of the first member 10. As already described, the plug member 30 is inserted into the cavity 40 formed between the second opposing surface 23 and the first opposing surface 13. The second opposing surface 23 is a surface parallel to the Y direction (corresponding to the second direction). The first member 10 and the second member 20 can be slid relatively in the Y direction (corresponding to the second direction) while the first member 10 (more specifically, the first opposing surface 13 of the first member 10) is in contact with the second opposing surface 23 (described later). That is, even in the second embodiment, the second opposing surface 23 also functions as a guide surface that guides the first member 10 and the second member 20 in the Y direction. The second opposing surface 23 faces the first opposing surface 13 over a predetermined length in the Y direction (the dimension in the Y direction of the first member 10 and the second member 20). The second opposing surface 23 is disposed at a distance of length L2 from the first opposing surface 13 in the X direction. The second opposing surface 23 is disposed between the two second fitting portions 21 in the Z direction. The second opposing surface 23 is disposed between the two second contact surfaces 22 in the Z direction. The second opposing surface 23 is disposed between the second protruding portion 26 and the second receiving portion 27 in the X direction.

The second protrusion 26 is a portion to be placed inside the first receiving portion 17 of the first member 10. In other words, the second protrusion 26 is a portion to be inserted into the first receiving portion 17 of the first member 10. The second protrusion 26 is a portion provided at the end of the first member 10 in the X direction. The second protrusion 26 is a portion that protrudes in the X direction relative to the second contact surface 22. The second protrusion 26 is configured so that its width (dimension in the Z direction) narrows toward the tip side in the X direction. The side surface of the second protrusion 26 is disposed opposite the inner surface of the first receiving portion 17. In addition, the second tip 26A, which is the tip of the second protrusion 26, is configured as a rounded curved surface. In this embodiment, since the second member 20 is formed by a 3D printer, it is easy to form a curved surface on the second tip 26A of the second protrusion 26. The second protrusion 26 is disposed adjacent to the second fitting portion 21 (specifically, disposed on the inner side of the second fitting portion 21 in the Z direction). The length (protrusion amount) of the second protrusion 26 relative to the second contact surface 22 is L3 (corresponding to the third length). The length L3 of the second protrusion 26 in the X direction is longer than the length L1 of the second fitting portion 21 in the X direction. In addition, the length L3 of the second protrusion 26 in the X direction is longer than the length L2 of the plug member 30 in the X direction.

The second receiving portion 27 is a portion that positions the first protrusion 16 of the first member 10 on the inside. In other words, the second receiving portion 27 is a portion that receives the first protrusion 16 of the first member 10. The second receiving portion 27 is a portion that is recessed toward the base end side in the X direction with respect to the second contact surface 22. The second receiving portion 27 is configured so that the width (dimension in the Z direction) becomes narrower toward the base end side in the X direction. The inner surface of the second receiving portion 27 is disposed opposite the side surface of the first protrusion 16. In addition, the inner surface of the second receiving portion 27 on the base end side in the X direction is configured as a rounded curved surface. In this embodiment, since the second member 20 is formed by a 3D printer, it is easy to form a curved surface on the inner surface of the base end side in the X direction of the second receiving portion 27. The second receiving portion 27 is a portion that is provided on the base end side in the X direction of the second member 20 from the second opposing surface 23. The second receiving portion 27 is provided closer to the base end of the second member 20 in the X direction than the second protruding portion 26, and the second opposing surface 23 is disposed between the second receiving portion 27 and the second protruding portion 26. The second receiving portion 27 is disposed adjacent to the second fitting portion 21 (more specifically, disposed on the inner side of the second fitting portion 21 in the Z direction). The length (recess amount) of the second receiving portion 27 relative to the second contact surface 22 is L3.

In the second embodiment, since the length L3 is longer than the length L2, the length L5 between the first tip 16A of the first protrusion 16 and the first opposing surface 13 in the X direction is longer than the length L4 between the second contact surface 22 and the second opposing surface 23 in the X direction. Similarly, the length L5 between the second tip 26A of the second protrusion 26 and the second opposing surface 23 in the X direction is longer than the length L4 between the first contact surface 12 and the first opposing surface 13 in the X direction. This makes it possible to restrict the direction in which the first member 10 and the second member 20 are initially slid relatively to a predetermined Y direction (corresponding to the second direction), and to prevent the first member 10 and the second member 20 from being joined in an incorrect procedure (described later).

The plug member 30 is a member inserted between the first opposing surface 13 and the second opposing surface 23. As in the first embodiment, the plug member 30 is inserted between the first opposing surface 13 and the second opposing surface 23, thereby suppressing the first member 10 and the second member 20 from being displaced in the X direction (first direction). In the second embodiment, the plug member 30 is also configured in a rectangular parallelepiped shape, but the shape of the wire member is not limited to this and may be, for example, wedge-shaped. The length in the X direction of the plug member 30 is L2 (corresponding to the second length). The length L2 in the X direction of the plug member 30 is longer than the length L1 in the X direction of the first fitting portion 11 and the second fitting portion 21. On the other hand, the length L2 in the X direction of the plug member 30 is shorter than the length L3 in the X direction of the first protrusion 16 and the second protrusion 26.

Figures 4A to 4D are explanatory diagrams of the joining method of the second embodiment.

As shown in FIG. 4A, the first member 10 and the second member 20 are brought close to each other in the Y direction (corresponding to the second direction), and the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20 are brought into contact with each other while the first member 10 and the second member 20 are slid relatively in the Y direction (corresponding to the second direction). As a result, the first opposing surface 13 and the second opposing surface 23 are arranged opposite each other over a predetermined length in the Y direction (the dimension of the first member 10 and the second member 20 in the Y direction). Sliding the first member 10 and the second member 20 in the Y direction (corresponding to the second direction) corresponds to the "first slide step."

In the second embodiment, since the length L3 is longer than the length L2, the length L5 between the first tip 16A of the first protrusion 16 and the first opposing surface 13 in the X direction is longer than the length L4 between the second contact surface 22 and the second opposing surface 23 in the X direction. Also, the length L5 between the second tip 26A of the second protrusion 26 and the second opposing surface 23 in the X direction is longer than the length L4 between the first contact surface 12 and the first opposing surface 13 in the X direction. This makes it possible to prevent the first member 10 and the second member 20 from being brought close to each other in the Z direction instead of the Y direction (corresponding to the second direction) in the first sliding step. That is, in the second embodiment, as shown in FIG. 4A, the direction in which the first member 10 and the second member 20 are initially slid relatively is limited to the Y direction (corresponding to the second direction). This prevents the first member 10 and the second member 20 from being joined in an incorrect procedure.

In the second embodiment, as shown in FIG. 4B, since the length L3 is longer than the length L2 (and the length L5 is longer than the length L4), in the state in which the first opposing surface 13 and the second opposing surface 23 are in contact with each other immediately after the first sliding step, the first tip 16A of the first protrusion 16 is disposed on the second receiving portion 27, and the second tip 26A of the second protrusion 26 is disposed on the first receiving portion 17. Therefore, the first protrusion 16 is prevented from coming off the second receiving portion 27, and the second protrusion 26 is prevented from coming off the first receiving portion 17. In addition, since the first member 10 and the second member 20 are prevented from sliding relatively in the Z direction from the state shown in FIG. 4B, the direction in which the first member 10 and the second member 20 are next slid relatively is limited to the X direction (corresponding to the first direction). Therefore, joining the first member 10 and the second member 20 in an incorrect procedure is prevented.

After the first member 10 and the second member 20 are slid relatively in the Y direction (corresponding to the second direction) to the state shown in FIG. 4B, the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction) as shown in FIG. 4C. At this time, the direction in which the first member 10 and the second member 20 are slid (X direction) is different from the sliding direction (Y direction) of the first sliding step shown in FIG. 4A. Sliding the first member 10 and the second member 20 in this X direction (corresponding to the first direction) corresponds to the "second sliding step."

In the second embodiment, the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction) until the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 come into contact with each other. This causes the first fitting portion 11 of the first member 10 to fit into the second fitting portion 21 of the second member 20. In other words, the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction) until the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 fit into each other. The amount of sliding between the first member 10 and the second member 20 in the X direction (corresponding to the first direction) required from the state in which the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20 are in contact (see FIG. 4B) to the state in which the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 are in contact (see FIG. 4D; in other words, the state in which the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 are fitted together) corresponds to length L2, which is longer than length L1 (the length in the X direction of the first fitting portion 11 and the second fitting portion 21).

In the second embodiment, as shown in FIG. 4C, when the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction), the first protrusion 16 enters the second receiving portion 27, and the second protrusion 26 enters the first receiving portion 17. When the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction), the first fitting portion 11 and the second fitting portion 21 approach each other, and the first contact surface 12 and the second contact surface 22 approach each other. When the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction), the first opposing surface 13 and the second opposing surface 23 are separated, and a cavity portion 40 is formed between the first opposing surface 13 and the second opposing surface 23.

Note that, since the first tip 16A of the first protrusion 16 is already disposed in the second receiving portion 27 and the second tip 26A of the second protrusion 26 is already disposed in the first receiving portion 17 at the stage shown in FIG. 4B, when the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction) as shown in FIG. 4C, the side surface of the first protrusion 16 of the first member 10 is guided to the inner surface of the second receiving portion 27 of the second member 20, and the side surface of the second protrusion 26 of the second member 20 is guided to the inner surface of the first receiving portion 17 of the first member 10. Therefore, when the first member 10 and the second member 20 are slid relatively in the X direction (corresponding to the first direction), there is no risk that the first protrusion 16 will come off the second receiving portion 27 or the second protrusion 26 will come off the first receiving portion 17, and the positional deviation in the Z direction between the first member 10 and the second member 20 is suppressed. In addition, because positional deviation in the Z direction between the first member 10 and the second member 20 is suppressed, by sliding the first member 10 and the second member 20 relatively in the X direction (corresponding to the first direction), the first fitting portion 11 and the second fitting portion 21 can be fitted together as shown in FIG. 4D, and the first contact surface 12 and the second contact surface 22 can be brought into contact with each other.

Furthermore, in the second embodiment, the first protrusion 16 of the first member 10 and the second protrusion 26 of the second member 20 are configured to have a width (dimension in the Z direction) that narrows toward the tip end in the X direction, and the first receiving portion 17 of the first member 10 and the second receiving portion 27 of the second member 20 are configured to have a width (dimension in the Z direction) that narrows toward the base end in the X direction. Therefore, as shown in FIG. 4C, when the first member 10 and the second member 20 are gradually slid relatively in the X direction (corresponding to the first direction), the first protrusion 16 gradually enters the second receiving portion 27, and the second protrusion 26 gradually enters the first receiving portion 17, the positional deviation in the Z direction between the first member 10 and the second member 20 is gradually suppressed. Therefore, when the first fitting portion 11 and the second fitting portion 21 start to fit together, the positional deviation in the Z direction between the first member 10 and the second member 20 is small, and the first fitting portion 11 and the second fitting portion 21 can be smoothly fitted together.

As shown in FIG. 4D, when the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 are in contact with each other (in other words, when the first mating portion 11 of the first member 10 and the second mating portion 21 of the second member 20 are mated), the first opposing surface 13 and the second opposing surface 23 are arranged with a length L2 between them in the X direction, thereby forming a cavity 40 of length L2 between the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20.

After the first contact surface 12 of the first member 10 and the second contact surface 22 of the second member 20 are brought into contact with each other, in other words, after the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 are fitted together, as shown in FIG. 4D, the plug member 30 is inserted into the cavity 40 between the first opposing surface 13 of the first member 10 and the second opposing surface 23 of the second member 20. Inserting the plug member 30 into the cavity 40 corresponds to an "insertion step". It is inserted into the cavity 40 from the Y direction (second direction). By inserting the plug member 30, the first member 10 and the second member 20 are prevented from shifting in the X direction (first direction), and the fitting between the first fitting portion 11 of the first member 10 and the second fitting portion 21 of the second member 20 is maintained. The plug member 30 is inserted into the cavity 40, thereby joining the first member 10 and the second member 20.

In the second embodiment, the first protrusion 16 (specifically, the first tip 16A) and the second protrusion 26 (specifically, the second tip 26A) have curved surfaces, and the first receiving portion 17 and the second receiving portion 27 also have curved surfaces. In the second embodiment, the first member 10 and the second member 20 are joined in a state in which the curved surface of the first protrusion 16 and the curved surface of the second receiving portion 27 are in contact with each other, and the curved surface of the second protrusion 26 and the curved surface of the first receiving portion 17 are in contact with each other (see FIG. 4D). As a result, compared to when the first protrusion 16 and the second tip 26A of the second protrusion 26 have an angular shape, stress concentration is less likely to occur in the first member 10 and the second member 20, and the strength of the joint is improved. However, it is also possible not to form curved surfaces on the first protrusion 16 and the second protrusion 26, and not to form curved surfaces on the first receiving portion 17 and the second receiving portion 27.

As described above, the joining method of the second embodiment joins the first member 10 and the second member 20, similar to the first embodiment. In the second embodiment, similar to the first embodiment, the first member 10 has a first fitting portion 11 having a length L1 (corresponding to the first length) in the X direction (corresponding to the first direction) and a first opposing surface 13. The second member 20 has a second fitting portion 21 that fits with the first fitting portion 11 and a second opposing surface 23 that faces the first opposing surface 13. Also in the second embodiment, a first sliding step is performed in which the first member 10 and the second member 20 are slid in the Y direction (corresponding to a second direction different from the first direction). In addition, after the first sliding step, the first member 10 and the second member 20 are slid in the X direction (corresponding to the first direction) to fit the first fitting portion 11 and the second fitting portion 21, and a second sliding step is performed to form a cavity 40 of length L2 (corresponding to a second length longer than the first length) between the first opposing surface 13 and the second opposing surface 23. In addition, after the second sliding step, an insertion step is performed to insert the plug member 30 into the cavity 40. According to the joining method of the second embodiment, after the first member 10 and the second member 20 are fitted together by sliding them in different directions, the plug member 30 fixes the first member 10 and the second member 20 so that the fitting between them is not released, so that the first member 10 and the second member 20 are not easily released, as in the first embodiment, and the strength of the joint is improved.

<Modification>
FIG. 5 is an explanatory diagram of a modified example of the second embodiment.

The plug member 30 of the modified example has a protrusion 30A. The protrusion 30A is a pin-shaped portion protruding from the side surface. When the plug member 30 is inserted into the hollow portion 40 between the first opposing surface 13 and the second opposing surface 23, the protrusion 30A elastically deforms so as to be crushed. This makes it difficult for the inserted plug member 30 to come off. In addition, the protrusion 30A is provided on the side surface facing the first opposing surface 13 and the second opposing surface 23. This strengthens the bond between the first member 10 and the second member 20. Note that the plug member 30 may have the protrusion 30A in the first embodiment as well.

In the figure, a first recess 13A is formed on the first opposing surface 13, and a second recess 23A is formed on the second opposing surface 23. The first recess 13A and the second recess 23A are portions into which the protrusion 30A of the plug member 30 enters. When the plug member 30 is inserted into the hollow portion 40, the protrusion 30A is elastically deformed so as to be crushed once, and enters the first recess 13A and the second recess 23A by returning the elastic deformation in the first recess 13A and the second recess 23A. This makes the plug member 30 even more difficult to come off. However, even if the first recess 13A and the second recess 23A are not present, when a plug member 30 having a protrusion 30A is inserted, the inserted plug member 30 becomes difficult to come off. Note that, even in the first embodiment, the first recess 13A may be formed on the first opposing surface 13, and the second recess 23A may be formed on the second opposing surface 23.

Figures 6A to 6D are explanatory diagrams of another modified example of the second embodiment.

As shown in Figs. 6A to 6D, the first member 10 may not have the first protruding portion 16 and the first receiving portion 17, and the second member 20 may not have the second protruding portion 26 and the second receiving portion 27. Also, as shown in Figs. 6A and 6B, the first contact surface 12 and the second contact surface 22 perpendicular to the X direction may not be provided. Also, the first fitting portion 11 and the second fitting portion 21 may be exposed to the outside as shown in Figs. 6A and 6B, or may be configured not to be exposed to the outside as shown in Fig. 6C. Also, as shown in Fig. 6B, the first fitting portion 11 and the second fitting portion 21 may have a curved surface. Similarly, as shown in Fig. 6B, the first opposing surface 13 and the second opposing surface 23 may be configured as curved surfaces and may not be parallel to each other. Also, as shown in Fig. 6D, the pairs of the first fitting portion 11 and the second fitting portion 21 may have different shapes.

===Other embodiments===
The above-mentioned embodiment is for the purpose of facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

10 First member, 11 First fitting portion, 12 First contact surface,
13 first opposing surface, 13A first recess,
14 non-through hole, 15 contact part,
16 First protrusion, 16A First tip, 17 First receiving portion,
20 Second member, 21 Second fitting portion, 22 Second contact surface,
23 second opposing surface, 23A second recess, 25 end portion,
26 second protruding portion, 26A second tip portion, 27 second receiving portion,
30 plug member, 30A protrusion,
40 hollow portion,
100 Joint structure

Claims (11)

A method for joining a first member and a second member, comprising the steps of:
The first member has a first fitting portion having a first length in a first direction and a first opposing surface,
the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface,
a first sliding step of sliding only the first member of the first member and the second member in a second direction different from the first direction, or sliding only the second member in a direction opposite to the second direction, thereby causing the first opposing surface and the second opposing surface to face each other over a predetermined length in the second direction;
a second sliding step in which, after the first sliding step , only the first member of the first member and the second member is slid in a direction opposite to the first direction or only the second member is slid in the first direction, thereby fitting the first fitting portion and the second fitting portion together and forming a cavity portion having a second length longer than the first length in the first direction between the first opposing surface and the second opposing surface;
an inserting step of inserting a plug member into the cavity;
having
The first member has a non-through hole having an abutment portion,
A joining method characterized in that, in the first sliding step, of the first member and the second member, only the first member is slid in the second direction, or only the second member is slid in a direction opposite to the second direction, until an end of the second member abuts the abutment portion of the first member . A method for joining a first member and a second member, comprising the steps of:
The first member has a first fitting portion having a first length in a first direction and a first opposing surface,
the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface,
a first sliding step of sliding only the first member of the first member and the second member in a second direction different from the first direction, or sliding only the second member in a direction opposite to the second direction, thereby causing the first opposing surface and the second opposing surface to face each other over a predetermined length in the second direction;
a second sliding step in which, after the first sliding step, only the first member of the first member and the second member is slid in a direction opposite to the first direction or only the second member is slid in the first direction, thereby fitting the first fitting portion and the second fitting portion together and forming a cavity portion having a second length longer than the first length in the first direction between the first opposing surface and the second opposing surface;
an inserting step of inserting a plug member into the cavity;
having
A joining method, comprising: forming the first member and the second member using a 3D printer. The bonding method according to claim 1 or 2 ,
A joining method characterized in that, in the first sliding step, while the first opposing surface and the second opposing surface are in contact with each other, only the first member of the first and second members is slid in a second direction different from the first direction, or only the second member is slid in a direction opposite to the second direction. The joining method according to claim 2 ,
The first member has a first protruding portion protruding in the first direction and a first receiving portion,
the second member has a second protruding portion that protrudes in the first direction and is disposed inside the first receiving portion, and a second receiving portion that is disposed inside the first protruding portion,
A joining method characterized in that, in the second sliding step , of the first member and the second member, only the first member is slid in a direction opposite to the first direction, or only the second member is slid in the first direction, thereby positioning the first protrusion portion on the second receiving portion and positioning the second protrusion portion on the first receiving portion. The joining method according to claim 4,
a joining method characterized in that, after the first sliding step, when the first opposing surface and the second opposing surface are in contact with each other, a first tip portion of the first protrusion is positioned in the second receiving portion, and a second tip portion of the second protrusion is positioned in the first receiving portion. The bonding method according to claim 1 , 4 or 5 ,
A joining method, comprising: forming the first member and the second member using a 3D printer. A joining structure including a first member, a second member, and a plug member,
The first member has a first fitting portion having a first length in a first direction and a first opposing surface,
the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface,
the first fitting portion and the second fitting portion are fitted to each other from the first direction,
the first opposing surface and the second opposing surface are opposed to each other over a predetermined length in a second direction different from the first direction, and are disposed apart from each other in the first direction by a second length longer than the first length,
the plug member is disposed in a cavity between the first opposing surface and the second opposing surface,
The first member has a non-through hole having an abutment portion,
A joining structure, characterized in that an end portion of the second member abuts against the abutment portion of the first member . A joining structure including a first member, a second member, and a plug member,
The first member has a first fitting portion having a first length in a first direction and a first opposing surface,
the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface,
the first fitting portion and the second fitting portion are fitted to each other from the first direction,
the first opposing surface and the second opposing surface are opposed to each other over a predetermined length in a second direction different from the first direction, and are disposed apart from each other in the first direction by a second length longer than the first length,
the plug member is disposed in a cavity between the first opposing surface and the second opposing surface,
The first member has a first protruding portion protruding in the first direction and a first receiving portion,
the second member has a second protruding portion that protrudes in the first direction and is disposed inside the first receiving portion, and a second receiving portion that is disposed inside the first protruding portion,
The first protruding portion and the second protruding portion are configured to have a width narrower toward a tip end side in the first direction,
A joint structure, characterized in that the first receiving portion and the second receiving portion are configured so that their widths narrow toward the base end side in the first direction. The joining structure according to claim 8 ,
A joining structure characterized in that, when the first opposing surface and the second opposing surface are in contact with each other, a first tip portion of the first protrusion is positioned in the second receiving portion, and a second tip portion of the second protrusion is positioned in the first receiving portion. A joining structure including a first member, a second member, and a plug member,
The first member has a first fitting portion having a first length in a first direction and a first opposing surface,
the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface,
the first fitting portion and the second fitting portion are fitted to each other from the first direction,
the first opposing surface and the second opposing surface are opposed to each other over a predetermined length in a second direction different from the first direction, and are disposed apart from each other in the first direction by a second length that is longer than the first length,
the plug member is disposed in a cavity between the first opposing surface and the second opposing surface,
The first member has a first protruding portion protruding in the first direction and a first receiving portion,
the second member has a second protruding portion that protrudes in the first direction and is disposed inside the first receiving portion, and a second receiving portion that is disposed inside the first protruding portion,
The first protrusion and the second protrusion have a curved surface,
The first receiving portion and the second receiving portion have a curved surface,
A joining structure characterized in that the first member and the second member are joined in a state in which the curved surface of the first protrusion and the curved surface of the second receiving portion are in contact with each other and the curved surface of the second protrusion and the curved surface of the first receiving portion are in contact with each other. A joining structure including a first member, a second member, and a plug member,
The first member has a first fitting portion having a first length in a first direction and a first opposing surface,
the second member has a second fitting portion that fits with the first fitting portion and a second opposing surface that faces the first opposing surface,
the first fitting portion and the second fitting portion are fitted to each other from the first direction,
the first opposing surface and the second opposing surface are opposed to each other over a predetermined length in a second direction different from the first direction, and are disposed apart from each other in the first direction by a second length longer than the first length,
the plug member is disposed in a cavity between the first opposing surface and the second opposing surface,
A joining structure, characterized in that the plug member has a protrusion on a side surface facing the first opposing surface and the second opposing surface.

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