JPH101065A - Welding connection structure for vehicle frame body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and properly prevent deformation of a frame member due to welding by forming a reinforcing member integrally with frame members inside the first hollow frame member and the second hollow frame member, extending the reinforcing member in the axial direction of the frame members, and protruding the reinforcing member from the inside walls of the frame members. SOLUTION: A side wall part 22 of a side sill 21 serving as the first hollow frame member and an end part 24 of a cross member serving as the second hollow frame member are butted to each other so as to be assembled by means of welding. On the inside wall of the welded side wall part 22 of the side sill 21, a reinforcing member 27 is formed integrally with the side wall part 22. The reinforcing member 27 is arranged within the area of a height B range defined by the upper wall and the lower wall of the cross member 23 and is protruded in parallel with the axial direction of the cross member 23. The reinforcing member 27 is extended in the axial direction of the side sill 21 and is formed so that its protruded width is provided with a length not less than a fusion area by welding. In this way, deformation of the frame member due to the welding can be prevented easily and properly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding structure for a frame body, and more particularly, to a frame structure for an automobile body formed by welding the ends of hollow frame members and side walls together by welding.

[0002]

2. Description of the Related Art As a conventional welding connection structure for a frame body, for example, a structure shown in FIG. 1 is known.
In the figure, a floor 2 of a frame body 1 is a floor 2
And a side sill 3 serving as a first hollow frame member, and a cross member 4 traversing the floor 2 and serving as a second hollow frame member. As shown in FIG. 2, the coupling structure of these frame members is such that the side wall portion 5 of the side sill 3 serving as the first hollow frame member and the end portion 6 of the cross member 4 serving as the second hollow frame member abut as shown in FIG. It has a welding structure that is assembled by welding.
FIG. 3 shows a side view of the floor 2.

[0003]

However, in such a conventional welded joint structure for a frame body, the cross-sectional shape of the frame member 3 of the side sill has a rectangular closed shape as shown in FIG. The cross member has only the side wall portion 5 and the upper and lower wall portions 9 as shown in FIG. 5, and the cross-sectional shape of the cross member frame member 4 is only the side wall portion 5 and the upper and lower wall portions 9. . Therefore, side sill 3
When welding the cross member 4 with the cross member 4,
As shown in FIG. 6 showing the cross section, the welded portion 10 of the side wall portion 5 of the side sill 3 is entirely melted by welding, and
Is depressed by Δx. As a result, at the time of the above-described welding, the cross member 4 is pulled into the recessed portion 12, and the cross member 4 is contracted by Δx in the axial direction A and deformed.

At the time of the welding, as shown in FIG. 7 showing a cross section taken along the line BB of FIG.
Are deformed inward (5 '), and the upper and lower walls 7 adjacent to the side wall 5 are deformed (7') outward. That is, the cross-section of the side sill 3
In the axial direction A. Further, the end portion 6 of the cross member 4 is melted over the entire circumference by welding, and the cross member 4 itself becomes a C-
As shown in FIG. 8 showing the C cross section, there is also a problem that Δz contracts in the axial direction A.

[0005] Then, when the above-mentioned deformations are combined,
As shown in FIG. 9, the entire floor 2 is welded in the axial direction A of the cross member 4 by δ (δ = 2Δx + 2Δy + 2Δz).
Shrinking deformation occurs. In contrast, conventionally, welding was performed in consideration of shrinkage of each frame member and anticipation of shrinkage. However, it takes a long time to find an optimal expected amount and to perform the adjustment of each frame member. was there. The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a welded structure of a frame body that can easily and appropriately prevent deformation of a frame member due to welding.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have solved the above problems by disposing a specific reinforcing material inside at least one of the hollow frame members. They have found that they can be solved, and have completed the present invention. That is, the welded joint structure for a frame body according to the present invention is a welded joint structure for a frame body formed by connecting a side wall portion of a first hollow frame member and an end portion of a second hollow frame member by welding. A reinforcing member integrally formed with the frame member inside the hollow frame member and / or the second hollow frame member, the reinforcing member extends in the axial direction of the frame member, and It is characterized by protruding from the inner wall of the frame member.

[0007]

According to the present invention, at least one of the first hollow frame member and the second hollow frame member has:
A reinforcing member protruding integrally with the frame member was provided.
Since this reinforcing member extends in the axial direction of the frame member on which the reinforcing member is provided, when the first and second hollow frame members are welded, they do not melt or hardly melt,
Particularly, the deformation of the second hollow frame member contracting in the axial direction can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. (Embodiment 1) FIG. 10 is a sectional view showing an embodiment of a welded joint structure for a frame body according to the present invention. First, the configuration will be described. This welded joint structure includes a side wall portion 22 of a side sill 21 as an example of a first hollow frame member and a cross member 23 as an example of a second hollow frame member.
And is assembled by welding with the end 24 of the butt.

Then, the welding side wall portion 22 of the side sill 21 is formed.
A reinforcement member 27 is formed integrally with the side wall portion 22 on the inner wall of the cross member 23. The reinforcement member 27 is provided within a range of a height B defined by the upper wall and the lower wall of the cross member 23. Although it protrudes substantially parallel to the axial direction of the cross member 23, it is not connected to the side wall portion 25 facing the side wall portion 22. The reinforcing material 27 extends in the axial direction of the side sill 21 as shown in FIG. 11 showing a cross section taken along line DD of FIG. It is formed so that it becomes.

Next, the operation of the present embodiment will be described. In the formation of the above-described welded joint structure, the end surface 24 of the cross member 23 is brought into contact with the outer wall of the welding side wall portion 22 of the side sill 21 in which the above-mentioned reinforcing member 27 is provided on the inner wall of the welding side wall portion 22 and welded. During this welding, a part of the welding side wall portion 22 of the side sill 21 is melted, but the reinforcing material 27 provided on the side wall portion 22 is substantially parallel to the axial direction A of the cross member 23 and the height of the cross member 23 is high. B, and the protrusion width thereof is equal to or longer than the melting region 26, so that the entire reinforcing member 27 does not melt and the rigidity is maintained. Therefore, even if the side sill 21 and the cross member 23 are connected by welding, the side wall 22 of the side sill 21 does not collapse.

That is, the cross member 23 as the second hollow frame member can be prevented from deforming the floor 2 contracting in the axial direction A. Note that, as described above, the protrusion width of the reinforcing member 27 is desirably set to a length equal to or longer than the melting region 26. However, even when the width is less than the melting region 26, the effect of suppressing the amount of depression is reduced. It goes without saying that it plays.

(Embodiment 2) FIG. 12 shows a second embodiment of the welded joint structure of the present invention. The welded joint structure of the present embodiment has substantially the same configuration as that of the first embodiment, but the reinforcing member 38 is provided on the inner wall of the side wall 32 of the side sill 31 at the same height as the upper and lower wall portions 35 of the cross member 33. It is configured to be. When welding the side wall 32 of the side sill 31 and the end surface 34 of the cross member 33, the welded side wall 32 of the side sill 31 is melted. However, since the reinforcing member 38 provided on the welding side wall portion 32 is located at the same position as the upper and lower wall portions 35 of the cross member and has a projection width larger than the fusion region 37 by welding,
2 is supported by the reinforcing material 38 that does not melt over the entire length of the upper and lower wall portions 35 of the cross member, so that it is possible to prevent the side wall portion 22 of the side sill from sinking. Therefore, it is possible to prevent the floor 2 from contracting in the axial direction A of the cross member 33.

(Embodiment 3) FIG. 13 shows a third embodiment of the welded joint structure of the present invention. The configuration of the welding connection structure of the present embodiment is almost the same as the configuration of the second embodiment,
Reinforcing member 47 provided on side wall portion 42 of side sill 41
Are connected to the opposing side wall portion 46. When welding the side wall portion 42 of the side sill 41 and the end surface 44 of the cross member 43, the side wall portion 42 is melted, but the reinforcing member 47 is substantially parallel to the axial direction of the cross member 43, and Since the welding side wall portion 42 is located at the same position and is connected to the opposing side wall portion 46, the welding side wall portion 42 is supported by the reinforcing material 47 that does not melt over the entire length of the upper and lower wall portions 45 of the cross member 43, thereby avoiding depression. That is, it is possible to prevent the floor 2 from contracting in the axial direction A of the cross member 43 that is the second hollow frame member.

Generally, when welding the side wall of the first frame member and the end of the second frame member,
Depending on the shape and thickness of the first hollow frame member or the restraint state of the jig, angular deformation may occur in the first hollow frame member. However, by adopting a configuration in which the reinforcing member 47 is connected to the opposing side wall 46 as in the welded joint structure of the present embodiment, it is also possible to prevent such angular deformation. In the present embodiment, the reinforcing member 47 is provided at the same position as the upper and lower wall portions 45 of the cross member. However, as in the first embodiment, the reinforcing member 47 is located within the range of the height defined by the upper and lower wall portions 45. Is provided, substantially the same effect as that of the present embodiment can be obtained.

(Embodiment 4) FIG. 14 is a sectional view showing a fourth embodiment of the welded joint structure of the present invention. The configuration of the present embodiment is substantially the same as the configuration of the third embodiment, except that a reinforcing material 58 is provided in addition to the reinforcing material 57 connected to the side wall portion 56 facing the welding side wall portion 52 of the side sill. The reinforcing member 58 is provided on the upper and lower wall portions 59 of the side sill 51.
And extends almost perpendicular to the cross member 53,
It intersects the reinforcing member 57 almost at a right angle.

When the welding side wall portion 52 of the side sill 51 is brought into contact with the end surface 54 of the cross member 53 for welding, the welding side wall portion 52 is melted by welding. However, the welding side wall 5
2 is substantially parallel to the cross member 53, is located at the same position as the upper and lower wall portions 55 of the cross member 53, and is connected to the opposing side wall portion 56. It is supported by the reinforcing material 57 that does not melt over the entire length of the upper and lower wall portions 55 of the member 53 and escapes from depression.

Further, as described above, since the reinforcing member 58 is provided substantially at right angles to the cross member 53, deformation of the upper and lower wall portions 59 of the side sill 51 due to welding can be prevented. That is, the entire cross section of the side sill 51 is
It is possible to prevent cross-sectional deformation of the cross member 53 crushed in the axial direction A. Therefore, it is possible to prevent the entire floor 2 from contracting in the axial direction A of the cross member 53. In the present embodiment, the reinforcing member 57 is provided at the same position as the upper and lower wall portions 55 of the cross member. However, as in the first embodiment, the reinforcing member 57 is provided within the height range defined by the upper and lower wall portions 55. Is provided, substantially the same effect as that of the present embodiment can be obtained.

(Embodiment 5) FIGS. 15 and 16 show a fifth embodiment of the welded joint structure of the present invention. Note that FIG.
FIG. 16 is a sectional view taken along the line EE in FIG. 15. In the present embodiment, this welding connection structure is assembled by welding by abutting the side wall portion 62 of the side sill 61 and the end portion 64 of the cross member 63. Unlike the first to fourth embodiments, the second hollow frame member is different from the first to fourth embodiments. The reinforcing member 67 is provided on the inner wall of the cross member 63. The reinforcing member 67 is provided on each of the upper and lower wall portions 68 and the side wall portion 69 of the cross member 63, and is provided between the opposing wall portions (68
-68, 69-69) are not connected. The reinforcing member 67 extends in the axial direction of the cross member 63 (see FIG. 16).

When welding the welding side wall portion 62 of the side sill 61 and the end surface 64 of the cross member 63, the cross member 6
Although the side wall portion 68 and the upper and lower wall portions 69 forming the cross section of the third member 3 are melted, the reinforcing member 67 having a projection width greater than the melting region 66 is provided on the inner wall portion of the cross member 63. Shaft shrinkage is prevented. Therefore, the second
A of the cross member 63 which is a hollow frame member
It is possible to prevent the floor 2 from shrinking to a predetermined shape. In the present embodiment, the reinforcing member 67 is formed of the upper and lower wall portions 68.
Although the space between the side walls 69 is not connected, the same effect as in the present embodiment can be obtained even if the structure is connected.

Although the present invention has been described in detail with reference to some embodiments, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the present invention. For example, the reinforcing material may be provided on both the first hollow frame member and the second hollow frame member.
Further, the reinforcing material does not need to extend over the entire length of the first hollow frame member and / or the second hollow frame member in the axial direction. It is.

[0021]

As described above, according to the present invention, since a specific reinforcing material is provided inside at least one of the hollow frame members, the deformation of the frame members by welding can be performed easily and appropriately. Thus, it is possible to provide a welded joint structure of the frame body which can be prevented from occurring. That is, it is possible to prevent the entire floor from deforming by contracting in the axial direction of the cross member, which is the second hollow frame, by welding. Therefore, it is not necessary to adjust the alignment of each frame member for the possibility of contraction and find the optimum estimated amount in advance, and the effect of providing a frame body with high productivity and high accuracy can be obtained.

Each embodiment has the following effects in addition to the above-mentioned common effects. In the first embodiment, the reinforcing material that does not melt supports the side wall of the first hollow frame member, so that the side wall of the first hollow frame member can be prevented from sinking. In the second embodiment, the welded side wall portion of the first frame member is supported by a reinforcing material that does not melt over the entire length of the upper and lower wall portions of the second frame member.
Of the frame member can be prevented from being depressed.

In the third embodiment, the welding side wall of the first frame member is supported by a reinforcing material that does not melt over the entire length of the upper and lower wall portions of the second frame member, and the welding side wall of the first frame member. Can be prevented from sinking. Also, it is possible to prevent the first frame member from being angularly deformed by welding. In the fourth embodiment, the welding side wall portion of the first frame member is supported by a reinforcing material that does not melt over the entire length of the upper and lower wall portions of the second frame member, and the depression of the welding side wall portion of the first frame member is reduced. At the same time, deformation of the upper and lower wall portions adjacent to the welding side wall portion of the first frame member due to welding can also be prevented. That is, it is possible to more efficiently prevent a cross-sectional deformation in which the cross section of the first frame member is entirely collapsed in the axial direction of the second frame member. In the fifth embodiment, the reinforcing material that does not melt prevents axial contraction of the second frame member itself.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a frame body and a floor.

FIG. 2 is a plan view of a floor.

FIG. 3 is a side view of a floor.

FIG. 4 is a cross-sectional view of a side sill as a conventional first hollow frame member.

FIG. 5 is a cross-sectional view of a cross member which is a second conventional hollow frame member.

FIG. 6 is a sectional view taken along line AA of FIG. 3;

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a sectional view taken along line CC of FIG. 2;

FIG. 9 is a plan view showing a conventional welding deformation of the entire floor.

FIG. 10 is a cross-sectional view showing a first embodiment of the welding connection structure of the present invention.

FIG. 11 is a sectional view taken along line DD of FIG. 10;

FIG. 12 is a sectional view showing a second embodiment of the welding connection structure of the present invention.

FIG. 13 is a sectional view showing a third embodiment of the welding connection structure of the present invention.

FIG. 14 is a sectional view showing a fourth embodiment of the welding connection structure of the present invention.

FIG. 15 is a sectional view showing a fifth embodiment of the welding connection structure of the present invention.

FIG. 16 is a sectional view taken along line EE of FIG. 15;

[Explanation of symbols]

 1 Frame Body 2 Floor 3 Side Sill 4 Cross Member 21 Side Sill 23 Cross Member 27 Reinforcement 31 Side Sill 33 Cross Member 38 Reinforcement 41 Side Sill 43 Cross Member 47 Reinforcement 51 Side Sill 53 Cross Member 57,58 Reinforcement 61 Side Sill 63 Cross Member 67 Reinforcement

Claims (12)

[Claims] 1. A side wall of a first hollow frame member and a second hollow frame member.
A welded structure of the frame body, wherein the end of the hollow frame member is connected to the end portion of the hollow frame member by welding, and formed integrally with the frame member inside the first hollow frame member and / or the second hollow frame member. A welded joint structure for a frame vehicle body, comprising: a reinforcing member provided in the axial direction of the frame member and protruding from an inner wall of the frame member. 2. The welded joint structure for a frame body according to claim 1, wherein the first hollow frame member and the second hollow frame member have substantially rectangular cross sections. 3. The reinforcing member is provided on an inner wall of the side wall portion of the first hollow frame member, and the reinforcing member projects in a second direction.
3. The welded joint structure for a frame body according to claim 2, wherein the welded structure is substantially parallel to the axial direction of the hollow frame member. 4. The frame according to claim 3, wherein the reinforcing member is provided at a height within a range defined by an upper wall and a lower wall of the second hollow frame member. Welded joint structure of the car body. 5. The welding connection of a frame body according to claim 4, wherein the reinforcing member is provided at the same height as the upper wall and the lower wall of the second hollow frame member. Construction. 6. The welded joint structure for a frame body according to claim 2, wherein the reinforcing member is not connected to the opposing side wall. 7. The projecting width of the reinforcing member has a length equal to or longer than a welded region by welding.
The welded joint structure for a frame body according to any one of the above items. 8. The welded joint structure for a frame body according to claim 2, wherein the reinforcing member is connected to an opposing side wall portion. 9. The first hollow frame member includes another reinforcing member, the reinforcing member being connected to an upper wall and a lower wall of the first hollow frame member, and intersecting with the reinforcing member. 9. The welded joint structure for a frame body according to claim 8, wherein: 10. The welded joint structure for a frame body according to claim 2, wherein the reinforcing member is provided on an inner wall of the second hollow frame member, and the reinforcing member is not connected to an opposing wall portion. . 11. The projecting width of the reinforcing member has a length equal to or longer than a welded area by welding.
The welded joint structure of the frame body described in the above. 12. The welded joint structure for a frame body according to claim 10, wherein the reinforcing member is provided on an inner wall of the second hollow frame member, and the reinforcing member is connected to an opposing wall portion. .