JP2021042785A - Tubular frame for moving body and manufacturing method of tubular frame for moving body - Google Patents

Abstract

To provide a technique which can facilitate manufacturing, in a tubular frame for a moving body which is constituted by connecting a plurality of tubular members.SOLUTION: In a tubular frame for a moving body having a first pipe part and a second pipe part connected to the first pipe part, the first pipe part comprises a first connection part formed at an end part of the first pipe part, being the first connection part in which a first slit is formed along a longitudinal direction of the first connection part, and the second pipe part comprises a second connection part formed at an end part of the second pipe part, being the second connection part whose cross section shape orthogonal to a longitudinal direction of the second connection part is substantially the same as that of the first connection part. A second slit is formed at either of the first connection part and the second connection part along its own longitudinal direction, and the first connection part and the second connection part are alternately overlapped on each other with the first slit and the second slit as a boundary, and joined to each other by a joining part, thus joining the first pipe part and the second pipe part to each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a tubular frame for a mobile body.

Conventionally, various connection structures have been proposed in a vehicle frame formed by connecting a plurality of tubular members (see, for example, Patent Documents 1 to 5).

Japanese Unexamined Patent Publication No. 2007-278337 Japanese Unexamined Patent Publication No. 2010-0129222 Japanese Unexamined Patent Publication No. 2010-215125 Japanese Unexamined Patent Publication No. 63-247184 Special Table 2010-528926

However, even in the techniques described in Patent Documents 1 to 5, there is still room for ingenuity in terms of facilitation of production. These problems are common not only to frames for vehicles but also to various moving bodies such as aircraft and trains.

The present invention has been made to solve the above-mentioned problems, and to provide a technique capable of facilitating manufacturing in a tubular frame for a mobile body formed by connecting a plurality of tubular members. With the goal.

The present invention has been made to solve the above-mentioned problems, and can be realized as the following forms.

(1) According to one embodiment of the present invention, there is provided a tubular frame for a mobile body including a first tube portion and a second tube portion joined to the first tube portion. In this tubular frame for a moving body, the first tube portion is a first connection portion formed at an end portion of the first tube portion, and a first slit is formed along the longitudinal direction of the first connection portion. The first connecting portion is provided, and the second pipe portion is a second connecting portion formed at an end portion of the second pipe portion, and has a cross-sectional shape orthogonal to the longitudinal direction of the second connecting portion. Is provided with a second connection portion that is substantially the same as the first connection portion, and a second slit is formed in either the first connection portion or the second connection portion along its own longitudinal direction. The first connecting portion and the second connecting portion are alternately overlapped with the first slit and the second slit as boundaries, and are joined by the joining portion, whereby the first pipe portion and the second pipe portion are joined. Is joined.

According to this configuration, the first pipe portion includes the first connection portion in which the first slit is formed, and the second pipe portion includes the second connection portion in which the second slit is formed, so that the cross-sectional shape is large. The substantially same first connection portion and the second connection portion can be alternately overlapped with the slit as a boundary. Therefore, by inserting the first tube portion and the second tube portion into each other, a tubular frame for a moving body can be easily manufactured.

(2) The outer shape of the tubular frame for a mobile body of the above-described form, which has a cross-sectional shape orthogonal to the longitudinal direction of the first connecting portion, the second connecting portion, and the connecting portion formed by the joint portion, has a polygonal shape. The first slit and the second slit may be arranged substantially point-symmetrically with respect to the axis of the center of gravity of the connecting portion. In this way, when the outer shape of the cross-sectional shape of the connecting portion is polygonal, the first connecting portion and the second connecting portion can be alternately overlapped with the slit as a boundary, so that the tubular frame for a vehicle can be easily manufactured. Can be manufactured in.

(3) In the tubular frame for a mobile body of the above-described form, the joint portion may be formed by an adhesive and may be arranged between the first connection portion and the second connection portion that overlap each other. In this way, when the first connection portion and the second connection portion are overlapped, the adhesive is applied to the outer surface of the side arranged inside, and the first connection portion and the second connection portion are overlapped with each other. Since the first pipe portion and the second pipe portion can be joined by crimping the mobile body, a tubular frame for a moving body can be manufactured more easily. Further, by adhering with an adhesive, the manufacturing time can be shortened as compared with the case of joining by welding, fasteners, or the like, for example.

(4) In the tubular frame for a mobile body of the above-described embodiment, the widths of the first slit and the second slit are substantially the same as the width obtained by adding the thickness of the joint portion to the plate thickness of the first connection portion. It may be. In this way, when the first tube portion and the second tube portion are inserted into each other at the time of manufacturing the tubular frame for a moving body, it is possible to suppress the scraping of the joint portion due to the slit.

(5) In the tubular frame for a moving body of the above-described embodiment, the lengths of the first slit and the second slit may be determined based on the strength and rigidity required for the connecting portion. In this way, when the first tube portion and the second tube portion are inserted into each other during the manufacture of the tubular frame for a moving body, the length at which the first connection portion and the second connection portion overlap each other depends on the length of the slit. Since it is determined, it is possible to easily and accurately configure a connection portion having appropriate strength and rigidity.

(6) In the tubular frame for a mobile body of the above-described embodiment, the second slit may be formed in the second connecting portion of the second pipe portion. In this way, the strength and rigidity of the first pipe portion can be improved as compared with the case where the second slit is formed in the first connection portion of the first pipe portion.

(7) In the tubular frame for a mobile body of the above-described form, the first slit is formed over the entire length of the first tube portion, and the second slit extends over the entire length of the second tube portion. It may be formed. In this way, the lengths of the first joint portion and the second joint portion in the longitudinal direction can be appropriately changed. Further, for example, it is possible to join the second pipe portion to both ends of the first pipe portion, and similarly, it is possible to join the first pipe portion to both ends of the second pipe portion. Tubular members can be used to construct tubular frames for mobiles of various shapes.

(8) According to another embodiment of the present invention, there is provided a method for manufacturing a tubular frame for a mobile body, comprising a first tube portion and a second tube portion joined to the first tube portion. In the tubular frame for a moving body, the first tube portion is a first connection portion formed at an end portion of the first tube portion, and a first slit is formed along the longitudinal direction of the first connection portion. The first connecting portion is provided, and the second pipe portion is a second connecting portion formed at an end portion of the second pipe portion, and has a cross-sectional shape orthogonal to the longitudinal direction of the second connecting portion. Is provided with a second connection portion that is substantially the same as the first connection portion, and a second slit is formed in either the first connection portion or the second connection portion along its own longitudinal direction. The method for manufacturing the tubular frame for a moving body includes a preparatory step for preparing the first tube portion, the second tube portion, and an adhesive, and the first connection portion of the first tube portion. An adhesive application step of applying an adhesive to a part of the outer side surface and applying an adhesive to a part of the outer surface of the second connection portion of the second pipe portion, and the first connection portion and the second connection portion. An insertion step of inserting the first pipe portion and the second pipe portion into each other so that the connecting portions overlap each other with a gap between the first slit and the second slit as a boundary. A joining step of pressing the first connecting portion and the second connecting portion from the outside to the inside and joining the first connecting portion and the second connecting portion with the adhesive is provided. In the adhesive application step, the adhesive is placed outside the first connection portion and the second connection portion so as to be arranged between the first connection portion and the second connection portion that overlap in the insertion step. Apply to the sides.

According to this method for manufacturing a tubular frame for a mobile body, since the first tube portion and the second tube portion are joined by an adhesive, the tubular frame for a mobile body can be easily manufactured. Further, in the insertion step, the first pipe portion and the second pipe portion are inserted into each other so that the first connection portion and the second connection portion overlap each other with a gap, so that the adhesive is scraped by the slit. It can be suppressed. Further, since the adhesive is applied to the outer surfaces of the first connection portion and the second connection portion, it is possible to more easily manufacture the tubular frame for a moving body as compared with the case where the adhesive is applied to the inner side surface.

The present invention can be realized in various aspects, and includes, for example, a moving body having a tubular frame for a moving body, a method for manufacturing a moving body having a tubular frame for a moving body, and a tubular frame for a moving body. It is realized in the form of a mobile manufacturing device, a control method of the manufacturing device, a computer program that realizes the control method, a server device for distributing the computer program, a non-temporary storage medium that stores the computer program, and the like. be able to.

It is a perspective view which shows schematic appearance structure of the tubular frame for a moving body of this embodiment. It is a perspective view which shows schematic appearance structure by disassembling the tubular frame for a moving body. It is explanatory drawing which shows typically the XZ cross-sectional structure of the tubular frame for a moving body. It is a process drawing which shows the joining method of the 1st pipe part and the 2nd pipe part of this embodiment. It is explanatory drawing which shows typically the process shown in FIG. It is explanatory drawing for demonstrating the structure of the tubular frame for a moving body of the comparative example. It is explanatory drawing which shows typically the XZ cross-sectional structure of the tubular frame for a moving body in 2nd Embodiment. It is explanatory drawing which shows typically the XZ cross-sectional structure of the tubular frame for a moving body in 3rd Embodiment. It is a perspective view which shows schematic appearance structure of the tubular frame for a moving body of 3rd Embodiment.

<First Embodiment>
FIG. 1 is a perspective view schematically showing an external configuration of a tubular frame 100 for a moving body according to the present embodiment. FIG. 2 is a perspective view schematically showing an external configuration by disassembling the tubular frame 100 for a moving body. FIG. 3 is an explanatory view schematically showing the XZ cross-sectional structure of the tubular frame 100 for a moving body. In FIGS. 1 and 2, a part of the tubular frame 100 for a moving body is illustrated. The figure shows XYZ axes that are orthogonal to each other to specify the direction. In the figure, the Y-axis direction coincides with the longitudinal direction of the connection portion described below. In the present specification, for convenience, the positive direction of the Z axis is referred to as the upward direction, and the negative direction of the Z axis is referred to as the downward direction. It may be installed at. Further, in the following description, the Z-axis direction is also referred to as a first direction, and the X-axis direction is also referred to as a second direction.

As shown in FIG. 1, the mobile tubular frame 100 of the present embodiment includes a first tube portion 10 and a second tube portion 20 joined to the first tube portion 10. In this embodiment, the moving body is, for example, a vehicle. As shown in FIG. 2, the first pipe portion 10 is formed with a first connecting portion 14 (in FIGS. 1 and 2, a dotted chain line is attached to indicate a boundary) at an end portion, and the second pipe portion 20 is formed. The second connection portion 24 is formed at the end portion. A first slit 12 is formed in the first connecting portion 14 along the longitudinal direction of the first connecting portion 14, and a second slit 22 is formed in the second connecting portion 24 along the longitudinal direction of the second connecting portion 24. Is formed.

As shown in FIG. 3A, the first connecting portion 14 and the second connecting portion 24 have substantially the same cross-sectional shape orthogonal to the longitudinal direction, and the outer shape of the cross-sectional shape is substantially a concave hexagon. Here, substantially the same means that the first connecting portion 14 and the second connecting portion 24 have the same cross-sectional shape excluding the first slit 12 and the second slit 22 in the cross-sectional shape orthogonal to the longitudinal direction. To do. The same includes errors such as dimensional tolerances. Further, in the present embodiment, the first slit 12 and the second slit 22 are arranged substantially point-symmetrically with the center of gravity axis C of the connecting portion 50 as the center.

The first connecting portion 14 and the second connecting portion 24 are alternately overlapped with the first slit 12 and the second slit 22 as boundaries. In other words, the first connecting portion 14 and the second connecting portion 24 are interchanged so as to be arranged on the outside with the first slit 12 and the second slit 22 as boundaries. Specifically, as shown in FIG. 3A, when the XZ cross section of the tubular frame 100 for a moving body is traced clockwise (clockwise) on the paper surface, the space between the second slit 22 and the first slit 12 is , The first pipe portion 10 is arranged on the outside, and the second pipe portion 20 is arranged on the outside between the first slit 12 and the second slit 22. As described above, since the first slit 12 and the second slit 22 are arranged substantially point-symmetrically with respect to the center of gravity axis C of the connecting portion 50, the first connecting portion 14 and the second slit 22 having substantially the same cross-sectional shape are the first. 1 slit 12 can be overlapped.

Then, the first pipe portion 10 and the second pipe portion 20 are joined by the first joint portion 31 and the second joint portion 32 arranged between the overlapping first connection portion 14 and the second connection portion 24. There is. As a result, the first pipe portion 10 and the second pipe portion 20 are joined. The first joint portion 31 and the second joint portion 32 are collectively referred to as a joint portion 30. Further, the connecting portion 50 is composed of the first connecting portion 14, the second connecting portion 24, and the joining portion 30. The joint portion 30 in this embodiment is formed of an adhesive. In FIGS. 2 and 3, the first joint portion 31 and the second joint portion 32 are shown with dot hatching.

The first pipe portion 10 and the second pipe portion 20 of the present embodiment can be formed of a metal such as steel, aluminum, magnesium, an alloy containing them, a resin material such as a fiber reinforced plastic, or the like. The first pipe portion 10 and the second pipe portion 20 may be formed by using the same kind of material or may be formed by using different materials. Further, as the adhesive for forming the joint portion 30, various adhesives such as epoxy resin and urethane can be used.

The width W (FIG. 3 (B)) of the first slit 12 is wider than the width obtained by adding the thickness t2 of the second joint portion 32 to the plate thickness t1 of the second connecting portion 24 (FIG. 3 (A)). Further, the width W (FIG. 3 (C)) of the second slit 22 is wider than the width obtained by adding the thickness t2 of the first joint portion 31 to the plate thickness t1 of the first connecting portion 14 (FIG. 3 (A)). .. Since the plate thickness t1 of the first connecting portion 14 and the second connecting portion 24 are equal, and the thickness t2 of the first joint portion 31 and the thickness t2 of the second joint portion 32 are equal, the first slit 12 and the first slit 12 and the first It can be said that the width of the two slits 22 is wider than the width obtained by adding the thickness t2 of the joint portion 30 to the plate thickness t1 of the first connection portion 14.

In the present embodiment, the length L1 of the first slit 12 (FIG. 2) and the length L2 of the second slit 22 are equal and are determined based on the strength and rigidity required for the connecting portion 50. As shown in FIG. 2, when the first pipe portion 10 and the second pipe portion 20 are arranged so that the first connecting portion 14 and the second connecting portion 24 face each other and are inserted into each other, the first slit 12 is formed. The second connecting portion 24 comes into contact with the end on the back side (negative direction of the Y axis) (hereinafter, also referred to as the first terminal 12T), and the end on the back side (positive direction of the Y axis) of the second slit 22 (hereinafter, the second). The insertion distance is determined by the contact of the first connecting portion 14 (also referred to as the terminal 22T). That is, the length L1 of the first slit 12 and the length L2 of the second slit 22 determine the length of the connecting portion 50 in the longitudinal direction. As described above, since the length L1 of the first slit 12 and the length L2 of the second slit 22 are determined based on the strength and rigidity required for the connecting portion 50, the first pipe portion is determined by the manufacturing method described later. When joining the 10 and the second pipe portion 20, the connecting portion 50 having the strength and rigidity required for the connecting portion 50 can be easily and accurately configured.

FIG. 4 is a process diagram showing a method of joining the first pipe portion 10 and the second pipe portion 20 of the present embodiment. FIG. 5 is an explanatory diagram schematically showing the process shown in FIG. In this embodiment, each step shown in FIG. 4 is executed by the robot. The method for manufacturing the tubular frame 100 for a mobile body of the present embodiment includes the steps described below.

In step P1 (FIG. 4), the first pipe portion 10, the second pipe portion 20, and the adhesive are prepared. In step P2, an adhesive is applied (adhesive) to a part of the outer surface of the first connection portion 14 of the first pipe portion 10 and a part of the outer surface of the second connection portion 24 of the second pipe portion 20. Agent application process). FIG. 5A shows an adhesive application step. As shown in the figure, the adhesive is placed between the first connecting portion 14 and the second connecting portion 24 which are overlapped in the insertion step (step P3) described later, so that the adhesive is placed between the first connecting portion and the second connecting portion. It is applied to the outer side surface.

In step P3 (FIG. 4), the first connecting portion 14 and the second connecting portion 24 are inserted into each other (insertion step). FIG. 5B shows an insertion step. As shown in the figure, the first connecting portion 14 and the second connecting portion 24 are overlapped with each other with a gap between the first slit 12 and the second slit 22 so as to be overlapped with each other. The two pipe portions 20 are inserted into each other.

In step P4 (FIG. 4), the first connection portion 14 and the second connection portion 24 are pressed from the outside to the inside (in other words, the first connection portion 14 and the second connection portion 24 are pressed against each other. The first joint portion 31 and the second joint portion 32 are joined with an adhesive (joining step). FIG. 5C shows a joining process. In FIG. 5C, the pressing direction is indicated by a white arrow. FIG. 5C shows a state in which the first joint portion 31 and the second joint portion 32 are pressed and joined to each other.

As described above, according to the mobile tubular frame 100 of the present embodiment, the first tube portion 10 includes the first connecting portion 14 in which the first slit 12 is formed, and the second tube portion 20 has a second tube portion 20. A second connecting portion 24 in which the second slit 22 is formed is provided, and the first slit 12 and the second slit 22 are arranged substantially point-symmetrically with respect to the center of gravity axis C of the connecting portion 50, so that the cross-sectional shape is formed. The first connection portion 14 and the second connection portion 24, which are substantially the same, can be overlapped with each other with the slit as a boundary. Therefore, by inserting the first tube portion 10 and the second tube portion 20 into each other, the tubular frame 100 for a moving body can be easily manufactured.

Further, since the first connection portion 14 and the second connection portion 24 overlap each other, the first pipe portion 10 is formed by joining the overlapped first connection portion 14 and the second connection portion 24 with an adhesive. And the second pipe portion 20 can be joined. Therefore, for example, the rigidity of the connecting portion 50 can be improved as compared with a so-called hat structure in which the ends of a plurality of pipe materials are joined together by welding. Further, since the first pipe portion 10 and the second pipe portion 20 can be joined by using an adhesive, it is easier than the case where the first pipe portion 10 and the second pipe portion 20 are joined by using a fastener such as a rivet or by welding. The tubular frame 100 for a moving body can be manufactured, and the manufacturing time can be shortened.

Further, since the lengths of the first slit 12 and the second slit 22 are determined based on the strength and rigidity required for the connecting portion 50, up to the ends of the slits (first end 12T, second end 22T). By inserting the first connecting portion 14 and the second connecting portion 24 into each other, the connecting portion 50 having appropriate strength and rigidity can be easily and accurately configured.

FIG. 6 is an explanatory diagram for explaining the configuration of the mobile tubular frame 100P of the comparative example. FIG. 6 is a cross-sectional view (vertical cross-sectional view) along the center of gravity axis of the moving tubular frame 100P including the center of gravity axis. The tubular frame 100P for a mobile body includes a first tube portion 10P and a second tube portion 20P joined to the first tube portion 10P. The first pipe portion 10P and the second pipe portion 20P are circular pipes, and the diameter of the first pipe portion 10P is larger than the diameter of the second pipe portion 20P. At the time of manufacturing the tubular frame 100P for a mobile body, the adhesive 30P is applied to the outer surface of the second tube portion 20P, and the second tube portion 20P is inserted into the first tube portion 10P (FIG. 6 (A)). Then, the adhesive 30P may be scraped by the first pipe portion 10P, and the first pipe portion 10P and the second pipe portion 20P may not be sufficiently adhered by the adhesive 30P (FIG. 6B). Moreover, even if they are adhered, sufficient strength and rigidity may not be obtained. On the other hand, according to the mobile tubular frame 100 of the present embodiment, the widths of the first slit 12 and the second slit 22 add the thickness t2 of the joint portion 30 to the plate thickness t1 of the first connection portion 14. Since it is wider than the width, it is possible to suppress the scraping of the adhesive when the first tube portion 10 and the second tube portion 20 are inserted into each other during the manufacture of the tubular frame 100 for a moving body. As a result, appropriate strength and rigidity can be obtained.

Further, according to the mobile tubular frame 100 of the present embodiment, in the connecting portion 50, the first connecting portion 14 and the second connecting portion 24 are alternately overlapped with the slit as a boundary, so that the first connecting portion 14 is manufactured at the time of manufacturing. By applying an adhesive to the outer surfaces of the connecting portion 14 and the second connecting portion 24, the first connecting portion 14 and the second connecting portion 24 can be joined. Therefore, it is possible to suppress the complexity of manufacturing as compared with the case where the adhesive is applied to the inner surface.

Further, since the first slit 12 and the second slit 22 are arranged substantially point-symmetrically with respect to the center of gravity axis C of the connecting portion 50, they are adhered to the entire circumference of the first connecting portion 14 and the second connecting portion 24. By applying the adhesive on one half circumference (one side) instead of applying the agent, it is possible to join substantially the entire circumference of the first connecting portion 14 and the second connecting portion 24. For example, when an adhesive is applied to the entire circumference of the first connecting portion 14 by a robot, energy, time, and cost are required to rotate the first connecting portion 14 or the robot. On the other hand, according to the mobile tubular frame 100 of the present embodiment, energy, time, and cost can be reduced.

Further, according to the method of joining the first pipe portion 10 and the second pipe portion 20 of the present embodiment, in the insertion step (step P3), the first connecting portion 14 and the second connecting portion 24 are separated from each other with a gap. The first pipe portion 10 and the second pipe portion 20 are inserted into each other so as to overlap each other, and in the joining step (step P4), the first connecting portion 14 and the second connecting portion 24 are pressed against each other and joined. To. Therefore, the adhesive spreads between the first connection portion 14 and the second connection portion 24, and the first connection portion 14 and the second connection portion 24 can be joined. At this time, since the first connection portion 14 and the second connection portion 24 are pressed against each other, the gap between the adhesive and the first connection portion 14 and the adhesive and the second connection portion 24 can be suppressed and brought into close contact with each other. it can. As a result, the bondability between the first connecting portion 14 and the second connecting portion 24 can be improved, and the strength and rigidity can be improved.

<Second Embodiment>
FIG. 7 is an explanatory view schematically showing the XZ cross-sectional configuration of the mobile tubular frame 100A according to the second embodiment. In FIG. 7, the Y-axis positive direction is the direction toward the back side of the paper surface. The mobile tubular frame 100A of the present embodiment has the same structure as the mobile tubular frame 100 of the first embodiment, although the XZ cross-sectional shape is different. The same configurations as those of the mobile tubular frame 100 of the first embodiment are designated by the same reference numerals, and the preceding description will be referred to.

Similar to the first embodiment, the mobile tubular frame 100A of the present embodiment includes a first pipe portion 10A and a second pipe portion 20A joined to the first pipe portion 10A. In the present embodiment, the first connecting portion 14A and the second connecting portion 24A have a substantially square outer shape in cross-sectional shape orthogonal to the longitudinal direction (FIG. 7A). Similarly to the first embodiment, the mobile tubular frame 100A of the present embodiment is also a part of the outer surface of the first connecting portion 14A of the first pipe portion 10A in the adhesive application step (FIG. 7B). , And a part of the outer surface of the second connecting portion 24A of the second pipe portion 20A is coated with the adhesive. Then, in the insertion step (step P3), the first pipe portion 10A and the second pipe portion 20A are inserted into each other and joined so that the first connecting portion 14A and the second connecting portion 24A overlap each other with a gap. In the step (step P4), the first connecting portion 14A and the second connecting portion 24A are pressed against each other and joined to each other (FIG. 7 (C)). Therefore, the same effect as that of the first embodiment can be obtained.

<Third Embodiment>
FIG. 8 is an explanatory view schematically showing the XZ cross-sectional configuration of the mobile tubular frame 100B according to the third embodiment. In FIG. 8, the Y-axis positive direction is the direction toward the back side of the paper surface. The mobile tubular frame 100B of the present embodiment has the same structure as the mobile tubular frame 100 of the first embodiment, although the XZ cross-sectional shape is different. The same configurations as those of the mobile tubular frame 100 of the first embodiment are designated by the same reference numerals, and the preceding description will be referred to.

Similar to the first embodiment, the mobile tubular frame 100B of the present embodiment includes a first pipe portion 10B and a second pipe portion 20B joined to the first pipe portion 10B. In the present embodiment, the first connecting portion 14B and the second connecting portion 24B have a substantially circular outer shape in cross-sectional shape orthogonal to the longitudinal direction (FIG. 8A).

Similarly to the first embodiment, the mobile tubular frame 100B of the present embodiment is also a part of the outer surface of the first connecting portion 14B of the first pipe portion 10B in the adhesive application step (FIG. 8B). , And a part of the outer surface of the second connecting portion 24B of the second pipe portion 20B is coated with the adhesive. Then, in the insertion step (step P3), the first pipe portion 10B and the second pipe portion 20B are inserted into each other and joined so that the first connection portion 14B and the second connection portion 24B overlap each other with a gap. In the step (step P4), the first connecting portion 14B and the second connecting portion 24B are pressed against each other and joined to each other (FIG. 8C). Therefore, the same effect as that of the first embodiment can be obtained.

In the present embodiment, the widths of the first slit 12B and the second slit 22B are formed wider than those in the first embodiment. In this way, by making the widths of the first slit 12B and the second slit 22B sufficiently wider than the width obtained by adding the thickness of the joint portion to the plate thickness of the first connection portion 14B, the first connection portion is formed in the insertion step. The 14B and the second connecting portion 24B can be overlapped with each other with a gap.

<Fourth Embodiment>
FIG. 9 is a perspective view schematically showing the external configuration of the tubular frame 100C for a mobile body according to the third embodiment. The mobile tubular frame 100C of the present embodiment differs from the mobile tubular frame 100 of the first embodiment in that the first slit 12C is formed over the entire length of the first tube portion 10C, and the second slit 22C is formed. , Only the point that it is formed over the entire second pipe portion 20C, and other configurations are the same as those of the first embodiment. Since the first slit 12C is formed over the entire length of the first pipe portion 10C and the second slit 22C is formed over the entire second pipe portion 20C, the first slit 12C is formed in the first connecting portion 14C. Is formed, and a second slit 22C is formed in the second connecting portion 24C. Since most of the slit 22C cannot be visually recognized in the appearance shown in FIG. 9, the second slit 22C is shown by a broken line in FIG.

In the present embodiment, since the slit is formed over the entire length of the first pipe portion 10C and the second pipe portion 20C, the length of the connecting portion where the first pipe portion 10C and the second pipe portion 20C overlap is appropriately set. , Can be set. In other words, the lengths of the first connecting portion 14C and the second connecting portion 24C can be changed. Further, the second pipe portion 20C can be joined to the other end of the first pipe portion 10C, and the first pipe portion 10C can be joined to the other end of the second pipe portion 20C. Therefore, parts of various lengths can be manufactured by using the first pipe portion 10C and the second pipe portion 20C.

<Modified example of this embodiment>
The present invention is not limited to the above-described embodiment, and can be implemented in various aspects without departing from the gist thereof. For example, the following modifications are also possible.

-In the above embodiment, an example is shown in which the first slit 12 is formed in the first pipe portion 10 and the second slit 22 is formed in the second pipe portion 20, but the first slit 12 and the second slit 22 are formed. It is not necessary that the first pipe portion 10 is formed and the second pipe portion 20 is not formed with a slit. Even in this way, the first pipe portion 10 and the second pipe portion 20 can be joined in the same manner as described above. However, according to the above embodiment, the strength and rigidity of the first pipe portion 10 can be improved as compared with the case where the first slit 12 and the second slit 22 are formed in the first pipe portion 10. Therefore, it is preferable.

The outer shape of the cross-sectional shape of the first connecting portion 14 and the second connecting portion 24 is not limited to the above embodiment, and is formed into various shapes such as a triangle, a pentagon, a hexagon, a concave polygon other than the above, and an ellipse. be able to.

-Although an example of joining the first connecting portion 14 and the second connecting portion 24 with an adhesive has been shown, a fastener such as a rivet may be used as the joining portion. Further, a joint portion may be formed by welding. In addition, a joint portion can be formed by combining various joining methods or by various known joining methods.

Although the example in which the lengths of the first slit 12 and the second slit 22 are determined based on the strength and rigidity required for the connecting portion 50 is shown, the length is not limited to this and can be appropriately determined.

The widths of the first slit 12 and the second slit 22 may be substantially the same as the width obtained by adding the thickness of the joint portion to the plate thickness of the first connection portion. Even in this way, it is possible to suppress the scraping of the adhesive. Further, the widths of the first slit 12 and the second slit 22 may be equal to or larger than the plate thickness of the first connecting portion. When the widths of the first slit 12 and the second slit 22 are substantially the same as the plate thickness of the first connecting portion, they can be joined by a joint portion other than an adhesive such as rivet or welding.

-The first pipe portion 10 and the second pipe portion 20 can be joined by a method other than the above-mentioned joining method. However, according to the above method, scraping of the adhesive can be suppressed, and the adhesive can be brought into close contact with the first connecting portion 14 and the second connecting portion 24, which is preferable.

-In the above embodiment, an example is shown in which the cross-sectional shape of the first connecting portion 14 is formed to be the same as the other portion of the first pipe portion 10, but it may be different. For example, the cross-sectional shape of the first connecting portion 14 may be square, and the other portion of the first pipe portion 10 may be circular. The same applies to the second pipe section.

-The portion of the first pipe portion 10 other than the first connecting portion 14 is not limited to a straight line, and may be bent, curved, or the like. The same applies to the second pipe section.

The forming positions of the first slit 12 and the second slit 22 are not limited to the above-described embodiment, and the first connecting portion 14 and the second connecting portion 24 can be arranged so as to be alternately overlapped with the slit as a boundary. In addition, it can be formed as appropriate.

-In the above embodiment, the vehicle is illustrated as a moving body, but the present invention can be applied to a tubular frame for various moving bodies such as an aircraft and a train.

Although the present embodiment has been described above based on the embodiments and modifications, the embodiments of the above-described embodiments are for facilitating the understanding of the present embodiment and do not limit the present embodiment. This aspect may be modified or improved without departing from its spirit and claims, and this aspect includes its equivalents. In addition, if the technical feature is not described as essential in the present specification, it may be deleted as appropriate.

10, 10A, 10B, 10C, 10P ... 1st pipe part 12 ... 1st slit, 12B, 12C ... 1st slit 12T ... 1st terminal 14, 14A, 14B, 14C ... 1st connection part 20, 20A, 20B, 20C, 20P ... 2nd pipe part 22, 22B, 22C ... 2nd slit 22T ... 2nd terminal 24, 24A, 24B, 24C ... 2nd connection part 30 ... Joint part 30P ... Adhesive 31 ... 1st joint part 32 ... Second joint 50 ... Connection 100P, 100, 100A, 100C, 100B ... Tubular frame for moving body C ... Center of gravity axis W ... Width t1 ... Plate thickness

Claims (8)

A tubular frame for a mobile body including a first pipe portion and a second pipe portion joined to the first pipe portion.
The first pipe portion is
A first connecting portion formed at the end of the first pipe portion, the first connecting portion having a first slit formed along the longitudinal direction of the first connecting portion.
The second pipe portion is
A second connecting portion formed at the end of the second pipe portion, the second connecting portion having a cross-sectional shape orthogonal to the longitudinal direction of the second connecting portion is substantially the same as that of the first connecting portion. ,
A second slit is formed in either the first connection portion or the second connection portion along the longitudinal direction of the first connection portion.
The first connection portion and the second connection portion are alternately overlapped with the first slit and the second slit as boundaries, and are joined by the joint portion, whereby the first pipe portion and the second pipe portion are joined. Is joined,
Tubular frame for mobiles. The tubular frame for a mobile body according to claim 1.
The outer shape of the cross-sectional shape orthogonal to the longitudinal direction of the first connection portion, the second connection portion, and the connection portion composed of the joint portion is a polygonal shape.
The first slit and the second slit are arranged substantially point-symmetrically about the center of gravity axis of the connecting portion.
Tubular frame for mobiles. The tubular frame for a mobile body according to any one of claims 1 and 2.
The joint
It is formed of an adhesive and is arranged between the first connecting portion and the second connecting portion which overlap each other.
Tubular frame for mobiles. The tubular frame for a mobile body according to any one of claims 1 to 3.
The widths of the first slit and the second slit are substantially the same as the width obtained by adding the thickness of the joint portion to the plate thickness of the first connection portion.
Tubular frame for mobiles. The tubular frame for a mobile body according to any one of claims 1 to 4.
The lengths of the first slit and the second slit are determined based on the strength and rigidity required for the connection portion.
Tubular frame for mobiles. The tubular frame for a mobile body according to any one of claims 1 to 5.
The second slit is formed in the second connecting portion of the second pipe portion.
Tubular frame for mobiles. The tubular frame for a mobile body according to any one of claims 1 to 4.
The first slit is formed over the entire length of the first pipe portion.
The second slit is formed over the entire length of the second pipe portion.
Tubular frame for mobiles. A method for manufacturing a tubular frame for a mobile body, comprising a first tube portion and a second tube portion joined to the first tube portion.
The first pipe portion is a first connection portion formed at an end portion of the first pipe portion, and is a first connection portion in which a first slit is formed along the longitudinal direction of the first connection portion. Prepare,
The second pipe portion is a second connecting portion formed at the end of the second pipe portion, and the cross-sectional shape orthogonal to the longitudinal direction of the second connecting portion is substantially the same as that of the first connecting portion. With a second connection
A second slit is formed in either the first connection portion or the second connection portion along the longitudinal direction of the first connection portion.
The method for manufacturing a tubular frame for a mobile body is as follows.
A preparatory step for preparing the first pipe portion, the second pipe portion, and an adhesive,
Adhesive application that applies an adhesive to a part of the outer surface of the first connection portion of the first pipe portion and applies an adhesive to a part of the outer surface of the second connection portion of the second pipe portion. Process and
The first pipe portion and the second pipe portion are arranged so that the first connection portion and the second connection portion overlap each other with a gap between the first slit and the second slit. With the insertion process of inserting each other
A joining step of pressing the first connecting portion and the second connecting portion from the outside to the inside and joining the first connecting portion and the second connecting portion with the adhesive.
With
In the adhesive application step,
The adhesive is applied to the outer surfaces of the first connecting portion and the second connecting portion so as to be arranged between the first connecting portion and the second connecting portion that overlap in the insertion step.
A method for manufacturing a tubular frame for a mobile body.

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