JP2004111636A - Box frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a box frame structure that can be inexpensively produced and has high strength by making production efficiency high, and dispensing with specific skill. <P>SOLUTION: A press fitting connection part is fixed by caulking of a rivet by press-fitting and connecting a tube-like connection part 22 of a trifurcate connection fitting 2 on one end of an outer frame square tube 11 having a bar projection part 1b on four cross sectional rectangular inner walls. A T-shaped connection fitting 3 is fixed at desired parts of a groove rail 1a provided on the outer wall of the outer frame square tube 11 with bolts/nuts 4, and a tube-like connection part of the T-shaped connection fitting 3 is press-fitted and connected to an inner frame square tube having a bar projection part to be fixed by caulking. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a box frame structure, and more particularly to a box frame structure suitable for a box that houses an electric vehicle control device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a method of inserting another member into a tube material used for assembling a structure and connecting the two members to each other, a gap fitting, a tight fitting, and the like are well known. However, in the state of the gap fitting, there is a problem that it easily comes off at the time of assembly, while on the other hand, there is a problem that a large press-in or press-fitting device is required to perform the interference fit.
2. Description of the Related Art Conventionally, as a method of manufacturing a box accommodating an electric vehicle control device, a method of welding an exterior plate material of the box to members constituting sides of the box is well known. However, the above-mentioned welding requires special advanced skills, and it takes a long time to correct distortion generated at the time of joining and also requires a high degree of skill, so that productivity is low, and the obtained box is expensive. There was a problem.
[0003]
Further, Japanese Patent Application Laid-Open No. 8-132252 discloses a technique in which a side component is inserted into each of the tubular connecting portions of the trifurcated corner material, and indirect welding is performed between the inserted side component and each of the tubular connecting portions. I have. Although the connection strength between the side component member and each of the tubular connection portions is improved by indirect welding, there is a problem that the above-mentioned preparations and welding work that require troublesome work for welding are required.
Japanese Patent Application Laid-Open No. 5-49115 discloses a technique for fixing a connecting portion between an inserted side component and a trifurcated corner material by caulking a rivet. However, the fixing strength by caulking a rivet is not so large. However, it is not suitable for applications in which a large force is applied in three directions of X, Y, and Z based on shaking during traveling of an electric vehicle, such as a box that accommodates an electric vehicle control device.
[0004]
[Patent Document 1]
JP-A-8-132252 (Summary structure, FIG. A)
[Patent Document 2]
JP-A-5-49115 (Summary structure, FIG. 2)
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to obtain a box frame structure which has high production efficiency, can be manufactured at low cost without requiring special skills, and has high strength. Aim.
[0006]
[Means for Solving the Problems]
The box frame structure according to claim 1 of the present invention has a rectangular cross section in a longitudinal direction, and has a tubular member forming a side of the box frame, a first tubular connecting portion connected to the tubular member, and a corner of the box frame. And a box frame structure in which one of the tube material and the tubular connection portion is press-fitted into the other, and a contact surface between the tube material and the tubular connection portion. It is characterized in that one of the projections is provided with a projection.
[0007]
The box frame structure according to a second aspect of the present invention is the box frame structure according to the first aspect, wherein the tube has a groove-shaped rail on an outer surface of which a T-shaped connecting member for connecting another tube is mounted. Is what you do.
[0008]
In the box frame structure according to a third aspect of the present invention, in the second aspect, the T-shaped connecting member includes a main body fixed to the groove-shaped rail and a second tubular connecting portion provided on the main body. And that one of the second tubular connecting portion and the tubular material is press-fitted into the other, and that a convex portion is provided on one of the contact surfaces of the tubular material and the second tubular connecting portion. It is a feature.
[0009]
In the box frame structure according to a fourth aspect of the present invention, in the first or third aspect, the convex portion extends in each longitudinal direction of the pipe, the first tubular connecting portion, or the second tubular connecting portion. It is characterized in that it is a formed strip-shaped convex portion.
[0010]
In the box frame structure according to claim 5 of the present invention, in claim 1 or 3, when the press-fit side is press-fitted to the press-fit side, the press-fit side and the press-fit side are caulked by rivets. It is characterized by being fixed.
[0011]
In the box frame structure according to claim 6 of the present invention, in claim 5, the first tubular connection portion and the second tubular connection portion each have a rectangular cross section orthogonal to each longitudinal direction or correspond to the tubular member. It is characterized in that it has a circular shape in which only a surface that is in contact with and fixed by the rivet is fixed.
[0012]
A box frame structure according to a seventh aspect of the present invention is the box frame structure according to the first aspect, wherein a first sealant filling groove for filling a sealant is provided on each outer surface of the tubular member and the trifurcated corner member. It is assumed that.
[0013]
The box frame structure according to claim 8 of the present invention is the box frame structure according to claim 7, wherein the first sealant filling groove provided in the tube and the three-forked corner are provided in a state where the tube and the three-corner corner are connected. The first sealant filling groove provided on the material is in communication with each other.
[0014]
The box frame structure according to a ninth aspect of the present invention is the box frame structure according to the first aspect, wherein a watertight seal is provided between the pipe material and the first tubular connection portion in a state where the pipe material and the trifurcated corner material are connected. A second sealant filling groove for filling an agent is provided in the tube material and / or the first tubular connecting portion.
[0015]
According to a tenth aspect of the present invention, in the first aspect, a positioning groove for facilitating drilling of a screw hole of the outer cover is provided for screwing the outer cover onto the box frame. It is characterized in that it is provided on the outer surface of the tube material.
[0016]
A box frame structure according to an eleventh aspect of the present invention is the box frame structure according to any one of the first to tenth aspects, which is used for a box that accommodates an electric vehicle control device.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, in the case where the same part as the part shown in the figure in the earlier order of the description is shown in the subsequent figures, the same reference numeral is assigned to each other, and the description is omitted in the subsequent figures.
[0018]
Embodiment 1 FIG.
1 to 5 illustrate a first embodiment of a box frame structure according to the present invention. FIG. 1 is a perspective view of the first embodiment, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 2 is a partially enlarged view of FIG. 2, FIG. 4 is another partially enlarged view of FIG. 2, and FIG. 5 is a cross-sectional view taken along line VV of FIG. 1 to 5, reference numeral 1 denotes a square tube as an example of the tube material forming the side of the box frame, 2 denotes a trifurcated connection fitting as an example of a triangular corner material forming a corner of the box frame, 3 Is a T-shaped connection fitting as an example of the T-shaped connection member, 4 is a bolt and a nut, 5 is a rivet, 51 is a rivet mounting hole, 6 is an exterior cover for covering the outer surface of the box frame, and 7 is an embodiment. It is a hanging foot for attaching a box obtained from the box frame structure of the first aspect to a floor under an electric car.
[0019]
As the square tube 1, as will be described later, two types of an outer frame square tube 11 and an inner frame square tube 12 are used, but both have the same shape and are different only in the place of use. 1a is a groove-shaped rail provided on each of two outer surfaces of the square tubes 11 and 12, as shown in FIGS. 4 and 5, and 1b is provided on each of four inner surfaces of the square tubes 11 and 12. It is a strip-shaped convex portion as an example of the above-mentioned convex portion. As shown in the perspective view of FIG. 4 and the cross-sectional view of FIG. 5, the groove-shaped rail 1a faces each other at the end faces of two mutually parallel walls extending perpendicularly from the surface of the outer frame square tube 11 at an interval. So that it has a structure that is bent inward. The rectangular tube 11 for the outer frame and the rectangular tube 12 for the inner frame both have a rectangular cross-section in the longitudinal direction with R provided at four corners, and the groove-shaped rail 1a and the strip-shaped convex portion 1b are formed in the longitudinal direction. Extends. By providing the groove-shaped rail 1a, the T-shaped connection fitting 3 is attached to the outer frame square tube 11, and the inner frame square tube 12 and the outer frame square tube 11 are connected via the T-shaped connection fitting 3. Easy and strong connection is possible.
[0020]
As shown in FIG. 3, the trifurcated connection fitting 2 includes a main body 21 and a tubular connection portion 22 extending in three directions from the main body 21 (in FIG. 3, one of them is press-fitted into the outer frame square tube 11). Each of the three tubular connecting portions 22 has a rectangular cross-section in the longitudinal direction similar to the outer frame square tube 11, and the outer tube square tube 11 has the same shape. It has a size that can be pressed.
[0021]
As shown in FIGS. 4 and 5, the T-shaped connection fitting 3 is provided with a main body 31 movably on a grooved rail 1 a provided on the outer frame square tube 11 and provided so as to hold the rail 1 a. It comprises a tubular connecting portion 32 extending vertically from the upper surface of the main body 31, and two bolts and nuts 4 for fixing the main body 31 to desired positions on the grooved rail 1a. The tubular connecting portion 32 has substantially the same cross-sectional shape and size as the tubular connecting portion 22 of the trifurcated fitting 2 so that the tubular connecting portion 32 can be pressed into the inner frame square tube 12.
[0022]
The bolt / nut 4 is composed of a bolt 41 and a nut 42. The bolt 41 has an outer diameter that can be inserted between the bent portions of the above-mentioned front end surface of the grooved rail 1a, and has a tip end. A locking portion 411 that can be locked inside the bent portion is rotatably attached around the axis of the bolt 41. Thus, the bolt 41 is inserted through the bolt hole of the main body 31 together with the main body 31 from the end of the grooved rail 1a, and the nut 42 is bolted together with the washer 43 on both sides of the T-shaped tubular connection portion 32 at a desired location. The T-shaped fitting 3 can be fixed to the outer frame square tube 11 by screwing it to the outer tube 41.
[0023]
The square tube for outer frame 11, the square tube for inner frame 12, the trifurcated connection fitting 2, and the T-shaped connection fitting 3 are made of a material capable of meeting the mechanical strength required in the practical use of the box frame structure of the present invention. In the case of a box for accommodating an electric car control device, for example, various structural aluminum alloys containing aluminum as a main component are exemplified, and the outer frame square tube 11 and the inner frame square tube 12 are exemplified. It is preferable to use one manufactured by extrusion of the above structural aluminum alloy.
[0024]
Next, the connection between the trifurcated connection fitting 2 and the outer tube square tube 11 will be described. Each tubular connection part 22 of the three-forked connection fitting 2 is press-fitted into the outer frame square tube 11. By this press-fitting, each of the four outer surfaces of the tubular connecting portion 22 and the strip-shaped convex portions 1b provided on the four inner surfaces of the outer frame square tube 11 are firmly connected. When the tubular connecting portion 22 is press-fitted into a conventional square tube having no strip-shaped convex portion 1b, the entire inner surface of the square tube 4 comes into contact with the 4 outer surfaces of the tubular connecting portion 22. Even if the fitting tolerance is very small, a large press-fit is required, so that there has been a problem that the efficiency of the connection work is reduced.
[0025]
On the other hand, in the first embodiment, since each of the four outer surfaces of the tubular connecting portion 22 only comes into contact with the surface of the strip-shaped convex portion 1b, it is necessary even under a relatively large fitting tolerance. Since the press-in force is small, if necessary, the triangular connection fitting 2 or the outer frame square tube 11 can be hit lightly with a mallet in the direction of the press-in. Thus, the connection work becomes simple and efficient. In addition, the outer tube square tube 11 and the trifurcated connection fitting 2 are firmly connected to each other for the interference fit based on the press-fitting.
[0026]
At this time, the average dimension between the surfaces of the two opposing strip-shaped projections 1b of the outer frame square tube 11 before press fitting is L1, and the average dimension between the outer surfaces of the tubular connecting portions 22 press-fitted between the surfaces is L2. When L2, L1 is larger than L1 by about 1/10000 to 1/50 mm, particularly preferably 1/1000 to 1/100 mm, or conversely, L1 is smaller than L2 by about 1/10000 to 1/50 mm, particularly It is preferable that the size be as small as about 1/1000 to 1/100 mm.
[0027]
In addition, the height of the strip-shaped convex portion 1b may be any dimension as long as the above-described press-fitting effect can be obtained, and is, for example, about 0.5 to 1 mm. Further, it is preferable that the width thereof is large enough to allow a rivet setting hole 51 described later to be pierced.
[0028]
After the above press-fitting, when the rivet 5 is mounted in the rivet mounting hole 51 penetrating the outer frame square tube 11 and the ridge-shaped convex portion 1b and the rivet mounting hole 51 penetrating the tubular connecting portion 22, the rivet 5 is crimped. The connection strength between the frame square tube 11 and the trifurcated connection fitting 2 is further improved.
[0029]
Connection between the tubular connection portion 32 of the T-shaped connection fitting 3 fixed to the outer frame square tube 11 in the manner described above and the inner frame square tube 12, that is, press-fitting of the tubular connection portion 32 into the inner frame square tube 12. The setting and swaging of the rivet 5 after press-fitting can be performed in the same manner as that of the outer frame square tube 11 and each of the tubular connecting portions 22. In addition, the relationship between the average dimension between the surfaces of the opposing strip-shaped protrusions 1b of the inner frame square tube 12 and the average dimension between the outer surfaces press-fitted between the surfaces of the tubular connecting portion 32 before the press-fitting is also described above. Can be as shown. In each connection described above, the number of rivets 5 to be attached at each connection point depends on the strength required for the box frame structure, but generally it is preferable to provide at least two rivets 5.
[0030]
After the box frame structure is completed, an outer cover 6 for covering the outer surface of the box frame and hanging feet 7 for mounting the box under the floor of the electric car are attached to the outer surface thereof. At this time, the suspension feet 7 are fixed by, for example, swaging the rivets 5 described above.
[0031]
Since the box frame structure according to the first embodiment is assembled as described above, the assembling time is short, work can be performed without requiring special skills and special jigs, and the box frame structure is inexpensive. Can be manufactured at low cost. For example, a box frame structure suitable for a box containing an electric vehicle control device can be manufactured in about one third of the working time as compared with a welded assembly.
[0032]
Embodiment 2 FIG.
6 and 7 illustrate a second embodiment of the box frame structure of the present invention. FIG. 6 is a partially enlarged perspective view of the second embodiment, and FIG. FIG. 6 is a cross-sectional view corresponding to FIG. 6 and 7, reference numeral 1 d denotes a sealant filling groove as an example of the first sealant filling groove provided on each outer surface of the outer frame square tube 11 and the inner frame square tube 12 (not shown). The groove 2d is a sealant filling groove as an example of the first sealant filling groove provided on the outer surface of the main body 21 of the trifurcated connection fitting 2, 8 is a sealant filled in the grooves 1d and 2d, 1e is a positioning groove.
[0033]
Since the electric vehicle control device is used by being mounted under the floor of the electric vehicle, it is necessary to protect the stored electric components from rainwater. In FIG. 1, when the closed surface is configured by covering the outer surface of the box frame structure with the outer cover 6, particularly between the outer cover 6 and the box frame structure, in particular, the outer tube square tube 11, the inner frame square tube 12, Alternatively, it is necessary to apply the sealing agent 8 over the entire surface of the mating surface between the trifurcated connection fitting 2 and the outer cover 6. Conventionally, since the sealing agent 8 is applied to each flat surface, the position of the sealing agent 8 is displaced and the applied amount of the sealing agent 8 varies.
[0034]
In order to solve these problems, in Embodiment 2, the sealant filling groove 1d is formed on each of the outer surfaces of the outer frame square tube 11 and the inner frame square tube 12 along the longitudinal direction of each outer surface. It is provided one by one on the left and right (or up and down) of the center of the lever. The sealant filling groove 2d has the same dimensions as the groove 1d, and is formed in a well shape on the outer surface of the main body 21 of the trifurcated fitting 2 and at a position connected to the groove 1d. Therefore, in a state where the outer frame square tube 11 is connected to each of the three tubular connecting portions 22 of the trifurcated fitting 2, the sealant filling groove 1 d is inserted via the well-shaped sealant filling groove 2 d. They are connected to each other.
[0035]
By providing the sealant filling grooves 1d and 2d, the above-mentioned problems of the displacement of the sealant 8 and the variation of the amount of application are solved, and the watertightness of the sealant 8 is stabilized and improved. Further, when applying the sealant 8, if the tip of the nozzle of the tube containing the sealant is applied to the grooves 1 d and 2 d along the grooves, the application operation is simplified, and the amount of application is uniform. In addition, when the sealant filling grooves 1d and 2d are connected, the problem of insufficient application of the sealant 8, which tends to occur at the boundary between them, is solved. The sealing agent filling grooves 1d and 2d preferably have an arc-shaped cross section. When the shape is an arc, the thickness of the sealant when the sealant 8 is applied to the groove is easily made constant, and the thickness of the sealant 8 depends on the depth of the groove, but can be as thick as, for example, about 1 mm. The reliability of watertightness is improved.
[0036]
The positioning groove 1e is a small V-shaped groove provided in the center of the four outer surfaces of the outer frame square tube 11, and is used when the mounting hole of the outer cover 6 is previously formed in accordance with the mounting hole of the outer cover. There is an advantage that drilling positioning and drilling work are facilitated. The positioning grooves 1e are effective on at least two, if not all, of the four outer surfaces of the outer tube square tube 11.
[0037]
Embodiment 3 FIG.
8 and 9 illustrate a third embodiment of the box frame structure of the present invention. FIG. 8 is a partially enlarged perspective view of the third embodiment, and FIG. 9 is a sectional view taken along line V-V in FIG. FIG. 8 is a cross-sectional view corresponding to FIGS. In FIGS. 8 and 9, reference numeral 2 b denotes a strip-shaped protrusion provided on each of the four outer surfaces of the tubular connection portion 22 of the trifurcated connection fitting 2. The third embodiment is different from the second embodiment in that a strip-shaped convex portion 1b provided on the inner surface of the outer frame square tube 11 or the inner frame square tube 12 (not shown) is used. The other configuration is the same except that the projection 2b is provided.
[0038]
In the first and second embodiments, the strip-shaped projections 1b provided on the inner surfaces of the outer frame square tube 11 and the inner frame square tube 12 are provided over the entire length of the square tubes, as apparent from the function thereof. It is not necessary to use the extrusion, and it is effective to provide only at the entrance where the tubular connection part 22 is press-fitted. However, extrusion is the most economical for industrial production of the outer tube 11 and the inner tube 12. It is practically difficult to provide the strip-shaped protrusions 1b only at the entrance by extrusion, and it is unavoidable to provide them over the entire length. On the other hand, since the tubular connecting part 22 is very short, even if it is provided over its entire length, economic efficiency is not substantially impaired. For this reason, in comparison with Embodiments 1 and 2 in which the strip-shaped protrusions 1b must be provided over the entire length of the inner surface of the outer frame square tube 11 or the inner frame square tube 12, the strip-shaped protrusions 1b are required. In the third embodiment in which the strip-shaped convex portions 2b are provided instead of the above, the embodiment is economical at least from the viewpoint of material cost, and has an effect of weight reduction.
[0039]
Embodiment 4 FIG.
FIG. 10 is a partially enlarged perspective view of the box frame structure according to the fourth embodiment of the present invention, in which only a part of the trifurcated fitting 2 is shown. Each of the three tubular connecting portions 22 extending in three directions from the main body 21 of the trifurcated fitting 2 (only one of them is shown in FIG. 10) is formed by molding a part of a cylindrical tube. Have been. That is, only the four outer surfaces of the cylindrical tube that come into contact with the strip-shaped protrusions 1b (see FIGS. 5 and 7) of the outer frame square tube 11 and the inner surfaces of the respective outer surfaces are processed into flat surfaces. . The flattening of the inner surface is useful for caulking a rivet. By forming a curved surface while leaving only a flat surface for caulking, molding of the trifurcated connection fitting 2 by cutting or casting becomes easy.
[0040]
In the fourth embodiment, the tubular connecting part 22 of the three-way fitting 2 has been described. However, the tubular connecting part 32 (see FIG. 3) of the T-shaped fitting 3 has the same shape as the tubular connecting part 22. Thus, the same effect as above can be obtained.
[0041]
Embodiment 5 FIG.
FIGS. 11 and 12 illustrate a fifth embodiment of the box frame structure of the present invention. FIG. 11 is an enlarged perspective view of the three-pronged connection fitting 2 used in the fifth embodiment, and FIG. FIG. 2 is a front view including a partially cutaway view of a three-pronged connection fitting 2. In FIGS. 11 and 12, reference numeral 3 d denotes a sealant filling groove as an example of the second sealant filling groove formed on the surface of the tubular connecting portion 22 near the main body 21. Although the sealant filling groove 3d is provided in each of the three tubular connecting portions 22, FIG. 12 shows a state in which only one of them has the sealant 8 filled in the sealant filling groove 3d. A state where the outer frame square tube 11 is provided thereon is shown. By providing the sealing agent filling groove 3d and filling it with the sealing agent 8, rainwater or the like is prevented from entering the inside of the outer frame square tube 11, and the outer frame square tube 11, and hence the box Corrosion or other problems due to intrusion rainwater or the like of the entire frame structure can be avoided.
[0042]
As described above, the present invention has been described with reference to the first to fifth embodiments. However, the present invention is not limited to these embodiments and includes various modifications. For example, the strip-shaped convex portion 2b may be provided on the tubular connecting portion 32 side of the T-shaped fitting 3. Further, the outer tube square tube 11 may be press-fitted into the tubular connection portion 22 of the three-pronged connection fitting 2, or the inner frame square tube 12 may be press-fitted into the tubular connection portion 32 of the T-shaped connection fitting 3. Instead of the strip-shaped protrusions 1b and 2b, one or more chevron-shaped or other non-striped protrusions may be used.
[0043]
【The invention's effect】
As described above, the box frame structure of the present invention has a tubular member having a rectangular cross section in the longitudinal direction and constituting a side of the box frame, and a first tubular connecting portion connected to the tubular member, and the box frame has A box frame structure comprising a three-pronged corner material forming a corner, and one of the pipe material and the tubular connection part being press-fitted into the other, and a contact surface between the pipe material and the tubular connection part. One of which is provided with a convex portion, for example, a strip-shaped convex portion formed in each longitudinal direction of the tube material or the first tubular connecting portion, which is necessary due to the presence of the strip-shaped convex portion. For example, it is possible to press-fit the trifurcated corner material or the above-mentioned tube material by lightly tapping with a mallet or the like in the direction of press-fitting, so that the connection work is simple and efficient. Moreover, the three-pronged corner material and the pipe material are firmly connected to each other due to the interference fit based on the press-fitting.
[Brief description of the drawings]
FIG. 1 is a perspective view of a first embodiment.
FIG. 2 is an exploded perspective view of FIG.
FIG. 3 is a partially enlarged view of FIG. 2;
FIG. 4 is another partially enlarged view of FIG. 2;
FIG. 5 is a sectional view taken along the line VV of FIG. 1;
FIG. 6 is a partially enlarged perspective view of the second embodiment.
FIG. 7 is a sectional view of the second embodiment corresponding to FIG. 5;
FIG. 8 is a partially enlarged perspective view of a third embodiment.
FIG. 9 is a cross-sectional view corresponding to FIGS.
FIG. 10 is a partially enlarged perspective view of a fourth embodiment.
FIG. 11 is an enlarged perspective view of a three-pronged connection fitting used in the fifth embodiment.
FIG. 12 is a front view including a partially cutaway view of the trifurcated connection fitting of FIG. 11;
[Explanation of symbols]
11 square tube for outer frame, 12 square tube for inner frame, 1a grooved rail,
1b ridges, 1d groove for filling sealant, 1e groove for positioning,
2 trifurcated fitting, 21 body, 2b strip-shaped projection, 22 tubular connection,
2d sealant filling groove, 3 T-shaped fitting, 31 body,
32 tubular connections, 4 bolts and nuts, 5 rivets,
51 Rivet mounting hole, 6 Exterior cover, 7 Hanging feet, 8 Sealant.

Claims (11)

A tube material having a rectangular cross section in the longitudinal direction and forming a side of the box frame, and a trifurcated corner material having a first tubular connecting portion connected to the tube material and forming a corner of the box frame, And it is a box frame structure in which one of the pipe material and the tubular connection portion is press-fitted into the other, and a protrusion is provided on one of the contact surfaces of the pipe material and the tubular connection portion. Characteristic box frame structure. 2. The box frame structure according to claim 1, wherein said tube has a groove-shaped rail on its outer surface for mounting a T-shaped connection member for connecting another tube. The T-shaped connecting member includes a main body fixed to the groove-shaped rail and a second tubular connecting portion provided on the main body, and one of the second tubular connecting portion and the tube material is provided. 3. The box frame structure according to claim 2, wherein a protrusion is provided on one of the abutting surfaces of the tubular member and the second tubular connecting portion. The said convex part is a strip | belt-shaped convex part formed in each longitudinal direction of the said pipe material, the said 1st tubular connection part, or the said 2nd tubular connection part, The Claim 1 or Claim 3 characterized by the above-mentioned. Box frame structure. The box frame structure according to claim 1 or 3, wherein the press-fit side and the press-fit side are fixed by caulking a rivet in a state where the press-fit side is press-fitted into the press-fit side. The first tubular connecting portion and the second tubular connecting portion each have a rectangular cross section orthogonal to the longitudinal direction, or a circular shape having only a plane that abuts on the pipe material and is fixed by caulking the rivet. 6. The box frame structure according to claim 5, wherein: 2. The box frame structure according to claim 1, wherein a first sealant filling groove for filling a sealant is provided on each outer surface of the tube material and the trifurcated corner material. In a state where the pipe material and the trifurcated corner material are connected, the first sealant filling groove provided in the pipe material and the first sealant filling groove provided in the trifurcated corner material communicate with each other. 8. The box frame structure according to claim 7, wherein: In a state where the pipe member and the trifurcated corner member are connected to each other, the second sealant filling groove for filling a sealant for watertightness between the pipe member and the first tubular connection portion is formed by the pipe member and / or the second sealant filling groove. 2. The box frame structure according to claim 1, wherein the box frame structure is provided on the first tubular connecting portion. 2. The box according to claim 1, wherein a positioning groove for facilitating drilling of a screw hole of the outer cover is provided on an outer surface of the tube material for screwing the outer cover onto the box frame. Frame structure. The box frame structure according to any one of claims 1 to 10, wherein the box frame structure is for a box that accommodates an electric vehicle control device.

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