JP2005289153A - Joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure whereby strength near a welded part (bead) of an inserted first member is enhanced, and distortion occurring on the first member in welding is restrained. <P>SOLUTION: In the first joint structure 27, a tip 35 of the cylindrical first member (vertical member )13 is inserted into an opening part (vertical joint opening part) 43 provided on a second member (connecting member) 24 which is a mating member, the vertical joint opening part 43 and the tip 35 are connected by fillet welding (welding part 28), and thereby the two members are connected, and a first reinforcing part 36 is provided on the tip 35 of the first member (vertical member) 13. The first reinforcing part 36 works as a restricting member and restrains deformation caused by expansion or contraction when welding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention inserts the front-end | tip part of a cylindrical 1st member in the opening part provided in the 2nd member which is a counterpart member, and joins this opening part and a front-end | tip part by fillet welding, and connects two members. The present invention relates to a joining structure to be connected.

A joining structure in which cylindrical members are joined vertically and horizontally is used in a vehicle. (For example, refer to Patent Document 1).
JP 2003-146240 A (Page 4, FIG. 1)

Patent document 1 is demonstrated based on the following figure.
17 (a) to 17 (c) are diagrams for explaining the basic configuration of the conventional technique. A conventional automobile sub-frame is connected to the tip of the sub-frame main body 301 and the sub-frame to the automobile body frame. When the size of the subframe main body 301 is insufficient, the flat portion 303 and the subframe are moved with the flat portion 303 of the color member 302 being shifted, as shown in FIG. The body 301 is fillet welded (bead 304). Therefore, the collar member 302 can be attached with high accuracy.

  However, in the automobile subframe of Patent Document 1, when the flat portion 303 and the tip portion of the subframe main body 301 are fillet welded (bead 304), welding distortion generated at the tip portion may increase. For example, when performing fillet welding (bead 304) on the entire end of the subframe main body 301, the distortion on the remaining side increases, and a gap is formed between the end and the collar member 302 (groove). There is.

  Further, in the automobile subframe of Patent Document 1, when a load is applied to the collar member 302, the tip end portion of the subframe main body 301 subjected to fillet welding (bead 304) is likely to be deformed and has higher strength. A structure was desired.

  It is an object of the present invention to provide a joint structure in which the strength of the inserted first member in the vicinity of a welded portion (bead) is increased and distortion generated in the first member during welding is suppressed.

  According to the first aspect of the present invention, the tip of the cylindrical first member is inserted into the opening provided in the second member, which is the mating member, and the opening and the tip are joined by fillet welding. In the joining structure for connecting two members, a reinforcing portion is provided at the tip of the first member.

  The invention according to claim 2 is characterized in that the reinforcing portion is shaped so as to squeeze the tube.

  The invention according to claim 3 is characterized in that the reinforcing portion is a holding member fitted in a cylinder.

  The invention according to claim 4 is characterized in that the opening is formed so that the edge of one side protrudes from the edge of the remaining side.

  In the invention which concerns on Claim 1, the front-end | tip part of a cylindrical 1st member is inserted in the opening part provided in the 2nd member which is a counterpart member, and this opening part and front-end | tip part are joined by fillet welding. In the joining structure for connecting two members, since the reinforcing portion is provided at the tip of the first member, the reinforcing portion serves as a restraining member to suppress deformation due to expansion and contraction during welding, and the first inserted. There is an advantage that the strength in the vicinity of the welded portion of the member can be increased and distortion generated in the first member during welding can be suppressed.

  In the invention which concerns on Claim 2, since the reinforcement part was shape | molded so that a pipe | tube could be restrict | squeezed, there exists an advantage that the intensity | strength of the welding part vicinity of the inserted 1st member can be raised.

  Moreover, since it shape | molded so that a cylinder may be restrict | squeezed, the distortion which arises in a 1st member in the case of fillet welding can be suppressed.

In the invention which concerns on Claim 3, since the reinforcement part is the holding member fitted to the cylinder, there exists an advantage that the intensity | strength of the welding part vicinity of the inserted 1st member can be raised with the holding member.
Moreover, the distortion produced in the first member during fillet welding can be suppressed.

  In the invention according to claim 4, since the opening is formed so that the edge of one side protrudes from the edge of the remaining side, the protruding side becomes a positioning side, and when inserting the first member, Positioning can be performed by placing the first member on the protruding side, and there is an advantage that the work of inserting the first member becomes easy.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver. C indicates the vehicle body center (vehicle width center). The drawings are viewed in the direction of the reference numerals.

FIG. 1 is a perspective view of a front subframe of a vehicle using the first joint structure of the present invention.
The front sub-frame 12 extends between the left and right vertical members 13 and 14 extending in the front-rear direction of the vehicle body 11 and the front end portions 15 and 16 of the vertical members 13 and 14 and extends in the left-right direction of the vehicle body 11. Between the member 17, the rear end portions 18, 19 of the left and right vertical members 13, 14 and extending in the left-right direction of the vehicle body 11, and the front end portions 15, 16 of the left and right vertical members 13, 14 Left and right connecting members 24 and 25 for connecting the end portions 22 and 23 of the front horizontal member 17. 26 is a unitary connection of the connecting member 24 and the front lateral member 17, which is a front assembly lateral member, 27 is a first joint structure, and 28 is a welded portion (including a bead) formed by performing fillet welding. .)
The material of the front subframe 12 is a metal material such as aluminum or an aluminum alloy (hereinafter collectively referred to as “aluminum alloy”).

  The left and right vertical members 13 and 14 are side members of a molded product in which a rectangular pipe made of, for example, a cylindrical extruded material (extrusion molded product) is partially formed into an uneven shape by bulge molding or the like. It has front end portions 15 and 16 and is connected to the front lateral member 17 (front assembly lateral member 26).

The front horizontal member 17 is a round pipe cross member made of, for example, a cylindrical extruded material (extruded product).
The left and right connecting members 24 and 25 are die-cast products cast in an L shape, and are integrally formed with attachment portions 32 and 32 having through holes 31 and 31 penetrating in the vertical direction at corners.

FIG. 2 is an exploded view of the first joining structure of the present invention, and shows a state where the left vertical member 13 is removed from the left connecting member 24.
Specifically, the vertical member 13 is formed by forming a cylindrical main body 34 that fits in the connecting member 24, and is provided with a first reinforcing portion 36 at a front end portion 35 ahead of the front end portion 15 of the main body 34.

  Specifically, the connecting member 24 is formed such that the lateral joint opening 41 is formed on one side with an inner diameter slightly larger than the outer diameter of the front lateral member 17 and the edge 42 of the lateral joint opening 41 becomes a groove. The vertical joint opening 43 is formed with the inner dimension slightly larger than the outer dimension of the main body 34 of the vertical member 13 and the edge 44 of the vertical joint opening 43 is processed to be a groove. It is.

  The longitudinal joint opening 43 includes an upper side 46, a lower side 47, and side sides 48 and 49, and the edge 44 of the lower side (one side) 47 is separated from the remaining upper side 46 and the edge 44 of the side sides 48 and 49 by a distance L. It is characterized by being formed so as to protrude only as a positioning side.

  In this way, in the longitudinal joint opening 43, the edge 44 of the lower side (one side) 47 is formed so as to protrude from the remaining upper side 46 and the edges 44 of the side sides 48 and 49 by a distance L. When inserting as shown by the arrow a1, the vertical member 13 can be positioned on the lower side (one side) 47 protruding by the distance L, and the operation of inserting the vertical member 13 becomes easy.

Here, the first joining structure 27 will be mainly described. In the first joining structure 27, the distal end portion 35 of the cylindrical first member (vertical member) 13 is connected to a second member (pre-assembly) which is a mating member. 2 by inserting into the opening (vertical joint opening) 43 provided in the horizontal member) 26 and joining the vertical joint opening 43 and the tip 35 by fillet welding (welded portion 28 (see FIG. 1)). As described above, the first reinforcing portion 36 is provided at the distal end portion 35 of the first member (vertical member) 13.
Although the second member is the pre-assembled horizontal member 26, the second member may be the connecting member 24.

FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 1 and shows a cross section of the first reinforcing portion 36 along with a cross section of the first joint structure 27.
The first reinforcing portion 36 is formed so as to squeeze the cylinder. Specifically, the first step portion 35 is connected to the distal end portion 35 to form a throttle step portion 51, and the first step portion 35 is connected to the throttle step portion 51 to form a parallel portion 52. Is.

  As described above, in the first joining structure 27, the first reinforcing portion 36 is provided at the distal end portion 35 of the first member (vertical member) 13, so that the first reinforcing portion 36 serves as a restraining member for welding. It is possible to suppress deformation due to expansion and contraction at the time, increase the strength of the inserted first member (vertical member) 13 in the vicinity of the welded portion 28, and distortion generated in the first member (vertical member) 13 during welding. Can be suppressed.

FIG. 4 is a perspective view of the first reinforcing portion of the first member of the present invention, and shows the cylindrical main body 34 and the first reinforcing portion 36 of the first member (vertical member) 13.
The main body 34 includes an upper side 54, a lower side 55, and side sides 56 and 57.

  In the first reinforcing portion 36, the throttle step portion 51 is formed continuously to the tip portion 35, so that the strength in the vicinity of the welded portion 28 of the inserted first member (vertical member) 13 is increased by the throttle step portion 51. Can do.

  In addition, since the throttle step 51 is formed, the throttle step 51 can suppress distortion generated in the first member (vertical member) 13 during fillet welding. For example, when fillet welding is finally performed on the upper side 46 of the longitudinal joint opening 43, a gap (corresponding to the root interval) is caused by welding distortion between the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13. ) Does not increase, and fillet welding can be performed on the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13 in a state in which the cause of welding defects is reduced without taking time and effort. .

  Since the first member (vertical member) 13 has a quadrangular cylindrical shape composed of an upper side 54, a lower side 55, and side sides 56 and 57, it is easy to set the welding posture to downward welding.

Next, the second bonding structure will be described.
FIG. 5 is a cross-sectional view of the second bonding structure of the present invention, and corresponds to FIG. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.
In the second bonding structure 27 </ b> B, the second reinforcing portion 36 </ b> B is provided at the tip portion 35 of the first member (vertical member) 13.

  The second reinforcing portion 36B is formed so as to squeeze the cylinder. Specifically, the second reinforcing portion 36B is formed with a height H2 so as to be connected to the distal end portion 35 so that the orthogonal side 61 is orthogonal to the central axis C1. .

FIG. 6 is a perspective view of the second reinforcing portion of the first member of the present invention, showing the cylindrical main body 34 and the second reinforcing portion 36B of the first member (vertical member) 13.
In the second reinforcing portion 36B, since the orthogonal side 61 is formed at a height H2 so as to be connected to the distal end portion 35 and orthogonal to the central axis C1, the first member inserted by the height H2 of the orthogonal side 61 ( The strength of the vertical member 13 near the welded portion 28 can be increased.

  Further, since the orthogonal side 61 is formed at a height H2 so as to be orthogonal to the central axis C1, the height H2 of the orthogonal side 61 suppresses distortion generated in the first member (vertical member) 13 during fillet welding. be able to. For example, when fillet welding is finally performed on the upper side 46 of the longitudinal joint opening 43, a gap (corresponding to the root interval) is caused by welding distortion between the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13. ) Does not increase, and fillet welding can be performed on the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13 in a state in which the cause of welding defects is reduced without taking time and effort. .

Next, a third bonding structure will be described.
FIG. 7 is a cross-sectional view of the third joining structure of the present invention and corresponds to FIG. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.
In the third joining structure 27 </ b> C, a third reinforcing portion 36 </ b> C is provided at the distal end portion 35 of the first member (vertical member) 13.
The third reinforcing portion 36C is formed so as to squeeze the cylinder. Specifically, the third reinforcing portion 36C is formed by connecting the tip portion 35 with the inclined side 62 at an angle θ and a height H3 with respect to the central axis C1. is there.

FIG. 8 is a perspective view of the third reinforcing portion of the first member of the present invention, showing the cylindrical main body 34 of the first member (vertical member) 13 and the third reinforcing portion 36C.
In the third reinforcing portion 36C, since the inclined side 62 is formed at an angle θ (see FIG. 7) and a height H3 (see FIG. 7) with respect to the central axis C1, the angle of the inclined side 62 is formed. The strength of the inserted first member (vertical member) 13 in the vicinity of the welded portion 28 can be increased depending on the height.

  In addition, since the inclined side 62 is formed at an angle θ (see FIG. 7) and a height H3 (see FIG. 7) with respect to the central axis C1, depending on the angle and height of the inclined side 62, the fillet welding is performed. Distortion occurring in one member (vertical member) 13 can be suppressed. For example, when fillet welding is finally performed on the upper side 46 of the longitudinal joint opening 43, a gap (corresponding to the root interval) is caused by welding distortion between the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13. ) Does not increase, and fillet welding can be performed on the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13 in a state in which the cause of welding defects is reduced without taking time and effort. .

Next, a fourth bonding structure will be described.
FIG. 9 is a cross-sectional view of the fourth joining structure of the present invention and corresponds to FIG. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.
In the fourth joint structure 27 </ b> D, a fourth reinforcing portion 36 </ b> D is provided at the distal end portion 35 of the first member (vertical member) 13.
The fourth reinforcing portion 36D is formed so as to squeeze the cylinder. Specifically, the four corners 63 (...) shown in FIG. The same shall apply hereinafter), and recesses 64 are formed respectively.

FIG. 10 is a perspective view of the fourth reinforcing portion of the first member of the present invention, and shows the cylindrical main body 34 and the fourth reinforcing portion 36D of the first member (vertical member) 13.
In the fourth reinforcing portion 36D, the recesses 64 are formed at the four corners 63 in connection with the tip portion 35, and therefore the first member inserted by the respective recesses 64. The strength of the vertical member 13 near the welded portion 28 can be increased.

  Moreover, since the concave portions 64 are formed at the four corners 63, respectively, the concave portions 64 are used to suppress distortion generated in the first member (vertical member) 13 during fillet welding. Can do. For example, when fillet welding is finally performed on the upper side 46 of the longitudinal joint opening 43, a gap (corresponding to the root interval) is caused by welding distortion between the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13. ) Does not increase, and fillet welding can be performed on the edge 44 of the upper side 46 and the upper side 54 of the first member (vertical member) 13 in a state in which the cause of welding defects is reduced without taking time and effort. .

Next, a fifth bonding structure will be described.
FIG. 11 is a perspective view of a rear subframe of a vehicle using the fifth joint structure of the present invention. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.
The rear sub-frame 71 spans between left and right vertical members 72, 73 extending in the front-rear direction of the vehicle body 11 and front end portions 74, 75 of the vertical members 72, 73 and extends in the left-right direction of the vehicle body 11. A member 76 and a rear horizontal member 81 extending between the rear end portions 77 and 78 of the left and right vertical members 72 and 73 and extending in the left-right direction of the vehicle body 11 are provided. Reference numeral 82 denotes a fifth joining structure.
The material of the rear subframe 71 is a metal material such as aluminum or an aluminum alloy (hereinafter collectively referred to as “aluminum alloy”).

The left vertical member 72 is a die-cast product, and includes an arm attachment portion 84 for attaching the vehicle body attachment portions 83 and 83 and a suspension arm (not shown), a front connection portion 85, and a rear connection portion 86. Prepare.
The right vertical member 73 is the same as the left vertical member 72 and will not be described.
The front horizontal member 76 is, for example, a cylindrical extruded material (extruded product), and is provided with fifth reinforcing portions 36E and 36E at the front end portions 87 and 87 fitted to the front connecting portions 85 and 85.

FIG. 12 is an exploded view of the rear sub-frame using the fifth joining structure of the present invention, in which the front horizontal member 76 is removed from the front connecting portion 85 of the left and right vertical members 72 (see FIG. 11). Indicates the state. Components similar to those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.

The front connecting portion 85 is a portion that forms the opening 43E and is processed so that the edge 44E of the opening 43E becomes a groove.
The opening 43E is composed of an upper side 46E, a lower side 47E, and side sides 48E and 49E. The edge 44E of the lower side (one side) 47E is stretched by a distance L5 from the remaining upper side 46E and the edge 44E of the side sides 48E and 49E. The positioning side is formed so as to protrude.

  As described above, the opening 43E is formed so that the edge 44E of the lower side (one side) 47E protrudes from the remaining upper side 46E and the edges 44E of the side sides 48E and 49E by the distance L5. When inserting as indicated by the arrow a3, the front horizontal member 76 can be positioned on the lower side (one side) 47E protruding by the distance L5, and the operation of inserting the front horizontal member 76 becomes easy. .

As described above, the front lateral member 76 is provided with the fifth reinforcing portion 36E at the distal end portions 87, 87.
The fifth reinforcing portion 36E is a first holding member 88 that is fitted to the distal end portion 87 of the front lateral member 76 formed in a cylinder.

  The first holding member 88 is a member that is connected to the plate body portion 91 and has a fixing margin 92. By providing the fixing allowances 92..., The contact portion with the front horizontal member 76 can be enlarged, and the front horizontal member 76 can be moderately stretched. The first holding member 88 is integrally attached by tight fitting (tight fit). However, the structure to be integrally attached is arbitrary, and may be fixed by welding, for example.

  The fifth joining structure 82 has openings provided in the second members (left and right vertical members) 72 and 73, which are the opposite members, of the distal end portions 87 and 87 of the cylindrical first member (front horizontal member) 76. The first member (front side member) is inserted into 43E, and the two members are connected by joining the opening 43E and the tip portion 87 by fillet welding (welded portion 28 (see FIG. 11)). A fifth reinforcing portion 36 </ b> E is provided at the tip portions 87 of the 76.

FIG. 13 is a cross-sectional view taken along line 13-13 of FIG. 11 and shows a cross section of the fifth reinforcing portion 36E along with a cross section of the fifth joint structure 82.
In the fifth joining structure 82, since the fifth reinforcing portion 36E is provided at the distal end portion 87 of the first member (front lateral member) 76, the fifth reinforcing portion 36E serves as a restraining member during welding. Deformation due to expansion and contraction can be suppressed, the strength of the inserted first member (front side horizontal member) 76 in the vicinity of the welded portion 28 can be increased, and the first member (front side horizontal member) 76 can be joined during welding. The generated distortion can be suppressed.

  The fifth reinforcing portion 36E is a first holding member 88 fitted to the distal end portion 87 of the front side member 76 formed in the cylinder, and the first member (front portion) inserted by the first holding member 88. The strength in the vicinity of the welded portion 28 of the lateral member 76 can be increased.

  Further, the fifth reinforcing portion 36E is a first holding member 88 that is fitted to the front end portion 87 of the front lateral member 76 formed in the cylinder, and the first holding member 88 is used for the fillet welding. Distortion occurring in one member (front lateral member) 76 can be suppressed. Therefore, fillet welding can be performed in a state in which the cause of welding defects is reduced without taking time and effort.

  FIG. 14 is an exploded view of the rear subframe using the sixth joint structure of the present invention, and shows a state in which the front horizontal member 76 is removed from the left and right vertical members 72 (see FIG. 11). Components similar to those in the embodiment shown in FIGS. 1 to 4 and FIGS. 11 to 13 are denoted by the same reference numerals and description thereof is omitted.

In the sixth joining structure 82B, the front lateral member 76 is provided with the sixth reinforcing portion 36F at the tip portions 87, 87.
The sixth reinforcing portion 36F is a second holding member 93 that is fitted to the distal end portion 87 of the front lateral member 76 formed in a cylinder.

  The second holding member 93 is made of die-casting, forms a fitting frame 94 that fits into the tip end portion 87, and forms a support member 95 in the fitting frame 94. The second holding member 93 is integrally attached by tight fitting (tight fit). However, the structure to be integrally attached is arbitrary, and may be fixed by welding, for example.

FIG. 15 is a cross-sectional view of the sixth joint structure of the present invention, which corresponds to FIG. 13 and shows a cross section of the sixth reinforcing portion 36F together with a cross section of the sixth joint structure 82B.
The sixth joint structure 82B can exhibit the same effect as the fifth joint structure 82 (see FIG. 13).
The sixth reinforcing portion 36F is a second holding member 93 that is fitted to the front end portion 87 of the front side member 76 formed in a cylinder. The first holding member (front portion) is inserted by the second holding member 93. The strength of the lateral member) 76 in the vicinity of the welded portion 28 can be further increased.

  The sixth reinforcing portion 36F is a second holding member 93 that is fitted to the front end portion 87 of the front lateral member 76 formed in the cylinder. Distortion occurring in one member (front lateral member) 76 can be more reliably suppressed.

  16 (a) and 16 (b) are explanatory views of the seventh joining structure of the present invention, (a) is a perspective view of the seventh reinforcing portion of the first member, and (b) is the seventh joining. It is sectional drawing of a structure and corresponds to FIG. Components similar to those in the embodiment shown in FIGS. 1 to 4 and FIGS. 11 to 13 are denoted by the same reference numerals and description thereof is omitted.

In (a), in the seventh joining structure 82 </ b> C, the front lateral member 76 is provided with a seventh reinforcing portion 36 </ b> G at the distal end portion 87.
The seventh reinforcing portion 36G is a third holding member 96 fitted to the front end portion 87 of the front side member 76 formed in a cylinder.
The third holding member 96 is formed so that the plate body portion 97 has a U shape and is tightly fitted to the distal end portion 87 (joint fit). The third holding member 96 is connected to the U shape plate body portion 97 to form the latching portion 101. Formed. Note that the third holding member 96 is integrally attached by tight fitting (tight fit), but the structure to be integrally attached is arbitrary, and may be fixed by welding, for example.

In (b), the seventh joining structure 82C can exert substantially the same effect as the fifth joining structure 82 (see FIG. 13).
The seventh reinforcing portion 36G can exhibit substantially the same effect as the fifth reinforcing portion 36E (see FIGS. 12 and 13). In other words, the strength of the inserted first member (front lateral member) 76 in the vicinity of the welded portion 28 can be increased, and distortion generated in the first member (front lateral member) 76 during fillet welding is suppressed. be able to.

Here, the first member (front lateral member) 76 is provided with a holding member as a reinforcing portion, but the reinforcing portion may be formed so as to squeeze the cylinder (see FIGS. 3 to 9).
Conversely, the first member (vertical member) 13 in FIG. 1 may use a holding member (see FIGS. 12 to 16) as a reinforcing portion.

  In addition, although the joining structure of this invention was applied to the four-wheeled vehicle in the embodiment, it can also be applied to a three-wheeled vehicle and can be applied to a general vehicle.

  The joint structure of the present invention is suitable for a four-wheeled vehicle.

The perspective view of the front sub-frame of the vehicle using the 1st junction structure of this invention Exploded view of the first joint structure of the present invention 3-3 sectional view of FIG. The perspective view of the 1st reinforcement part of the 1st member of this invention Sectional drawing of the 2nd junction structure of this invention The perspective view of the 2nd reinforcement part of the 1st member of this invention Sectional drawing of the 3rd junction structure of this invention The perspective view of the 3rd reinforcement part of the 1st member of this invention Sectional drawing of the 4th junction structure of this invention The perspective view of the 4th reinforcement part of the 1st member of the present invention. The perspective view of the rear sub-frame of the vehicle using the 5th junction structure of this invention Exploded view of rear subframe using fifth joining structure of the present invention Sectional view along line 13-13 in FIG. Exploded view of rear sub-frame using the sixth joint structure of the present invention Sectional drawing of the 6th junction structure of this invention Explanatory drawing of the 7th junction structure of this invention The figure explaining the basic composition of conventional technology

Explanation of symbols

  DESCRIPTION OF SYMBOLS 13 ... 1st member (vertical member), 24 ... 2nd member (connection member), 35 ... Front-end | tip part of a 1st member, 36, 36B-36D ... Reinforcement part, 43 ... Opening part, 47 ... One side (lower side), 88, 93, 96 ... holding members.

Claims (4)

A joining structure that connects two members by inserting the tip of the cylindrical first member into an opening provided in the second member, which is a counterpart member, and joining the opening and the tip by fillet welding In
A joining structure, wherein a reinforcing part is provided at a tip part of the first member.   The joint structure according to claim 1, wherein the reinforcing portion is formed so as to narrow a cylinder.   The joining structure according to claim 1, wherein the reinforcing portion is a holding member fitted in a cylinder. The joint structure according to claim 1, wherein the opening is formed so that an edge of one side protrudes from an edge of the remaining side.

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