JPH11348830A - Coupling structure of vehicle body member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the strength of a coupling part between side members. SOLUTION: A first and a second reinforcement 21, 40 are fixed to a hut-like cross-sectional shape side member rear 10 and a floor side member 11, respectively. An end part 15a of the bottom wall 15 of the side member rear 10, an end part 22a of the bottom wall 30 of the first reinforcement 21 and an end part 30a of the bottom wall 30 of the floor side member rear 10 are superposed on one another, and are spot-welded together in a welding part W3. The bottom wall 41 of the second reinforcement 40 is formed in its end part with an overhanging part 46 and an overlap wall 50 on both sides of a cut-out 45 which can avoid interfering with the welding part W3. The overhanging part 46 and the overlap wall 50 are superposed on the end part 22a of the bottom wall 22 of the first reinforcement 21 and the end part 23a of a longitudinal wall 23, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a vehicle body member, and more particularly to a connection structure for a side member.

[0002]

2. Description of the Related Art An example of a vehicle body partially shown in FIGS. 8 and 9 has a pair of left and right front side members 100 as body members.
In between, a space for mounting the power plant 101 such as an engine and a transmission is secured. A side sill 102 is connected to the rear end of the front side member 100. The side sill 102 passes along the side of the vehicle body along the floor pan 103 and extends rearward of the vehicle body.

A floor side member 112 is connected to a rear end of the front side member 100 via a side member rear 111. Floor side member 112
Extends rearward of the vehicle body through the lower surface of the floor pan 103. The floor side member 112 is welded to the floor pan 103 before being connected to the side member rear 111. A dash panel 115, a dash cross member 116, and the like are provided in front of the floor pan 103. A tunnel portion 118 is formed at the center of the floor pan 103 in the vehicle width direction.

[0006] As shown in FIG. 10, a cyclos member 120 is fixed to a front side member 100 and a side member rear 111 by a fixing means such as a bolt 121. The shaft member 120 extends in the width direction of the vehicle body and connects the pair of left and right front side members 100 to each other.

[0005] As in the conventional example shown in FIG. 11, the side member rear 111 has a bottom wall 125, a vertical wall 126, and a flange 1.
27, the strength of which is increased by spot welding a reinforcement 130 as a reinforcing member at the welded portion W1 indicated by x in the figure. The floor side member 112 also has a hat-shaped cross section having a bottom wall 135, a vertical wall 136, and a flange 137,
The reinforcement 140 is strengthened by spot welding a reinforcement 140 as a reinforcing member at a welded portion W2 indicated by x in the drawing.

It is conceivable that the side members are constituted only by the side members without using these reinforcements and the cross section of the side members is increased or the thickness of the side members is increased. When the thickness is increased, the thickness ratio of the floor pan to the thickness becomes too large (2 to 2).
However, there is a problem that welding quality is reduced and press formability is deteriorated due to the upper limit of about 2.5 times). Therefore, the thickness of the side member is limited to about 2.3 mm.

[0007] In order to guarantee the welding quality by the ordinary spot welding technique, the number of laminated portions of the welded portion is limited to three. For this reason, as shown in FIG. 12, the current connecting portion Q includes an end 125 a of the bottom wall 125 of the side member rear 111, an end 131 a of the bottom wall 131 of the reinforcement 130, and an end of the bottom wall 135 of the floor side member 112. 135a, and is spot-welded at a welded portion W3 indicated by a black triangle in the figure, and the end 1 of the bottom wall 125 of the side member rear 111 is overlapped.
25a, a part 135b of the bottom wall 135 of the floor side member 112, and the end 14 of the bottom wall 141 of the reinforcement 140.
It has been considered that spot welding is performed at the welded portion W4 indicated by a white triangle in the figure by overlapping with 1a. further,
The end of the flange 127 of the side member rear 111 and the end of the flange 137 of the floor side member 112 overlap,
Spot welding is performed at the welding portion W5 indicated by a white circle in the figure together with the floor pan 103 (not shown in FIG. 12). The flange 127 of the side member rear 111 on the front side of the welded portion W5 is connected to the floor pan 103 (FIG. 12).
(Not shown). Here, the welding portion W3 and the welding portion W4 are, for example, the floor pan 1 shown in FIG.
Welding is performed using the work opening 145 formed in the third work piece 03.

[0008]

The connection structure (FIG. 11)
12 and FIG. 12), since there is a portion G where the reinforcements 130 and 140 are interrupted at the connection portion Q between the side member rear 111 and the floor side member 112, the strength of this portion is locally lower than other portions. Become. On the other hand, for example, when an offset collision test or the like is performed in which only the left side of the vehicle body with respect to the vehicle center line C (shown in FIG. 9) collides with the barrier, one of the front side members 100 is mainly compressed and deformed, and The power plant 101 collides directly with the barrier and the power plant 101
It comes into contact with 0. At this time, the load at which the front side member 100 is compressed and deformed and the power plant 101
A load R (shown in FIG. 10) acts on the fixed portion on the left side of the shaft member 120 in the circumferential direction with the fixed portion on the right side substantially at the center due to the load transmitted directly from the shaft member to the shaft member 120. Will do. At this time, the shacyclos member 120 generally has high strength, and the entire shape is rarely greatly deformed.

The load R is also transmitted to the side sill 102. However, the load R acts on the inside of the vehicle body and generates a large bending load on the side sill 102.
2 is difficult to support, and it is effective to support with the side member rear 111 and the floor side member 112 extending in the direction substantially coinciding with the load direction. However, as shown in FIG. 10, the fixed portions of the front side member 100 and the shaft cyclos member 120 are located above the rear portion of the side member rear 111 and the floor side member 112, so that the load R causes the side member rear 111
A bending load that causes downward convex deformation is applied to the rear portion and the floor side member 112.

However, the connecting portion Q, particularly the portion G where the reinforcements 130 and 140 are interrupted, is easily deformed by the bending load as shown by a two-dot chain line in FIG.
Due to this deformation, the dash panel 115 is deformed toward the vehicle interior (in the direction of arrow B in FIG. 10), and the space in the vehicle interior may be narrowed. Have been. In addition, it is conceivable to add another member to such a connecting portion from the outside by bolts, arc welding, or the like (for example, Japanese Utility Model 6).
In this case, there is a problem that a separate process for joining the separate members is required and that the cost increases due to an increase in the number of parts. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a connecting structure that can connect side members constituting a vehicle body to each other with high strength.

[0011]

According to the first aspect of the present invention, there is provided a connecting structure for a vehicle body member according to the present invention, which has been developed to achieve the above object. The end of the bottom wall of the reinforcement and the end of the bottom wall of the second side member are overlapped with each other, and spot welding is performed by combining three pieces. In this case, since the overlapping wall provided on the second reinforcement is overlapped with the end of the first reinforcement, the reinforcement is continuous without interruption in the longitudinal direction of the side member, and the reinforcement is provided. It is not necessary to externally attach a separate member for use, and large strength is exhibited against a bending load or the like applied to the connecting portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. A part of the vehicle body shown in FIG. 1 includes a side member rear 10 as an example of a first side member, and a floor side member 11 as an example of a second side member.

The side member rear 10 has a hat-shaped cross section having a bottom wall 15, a pair of left and right vertical walls 16 rising from both sides of the bottom wall 15, and a flange 17 provided at an upper end of the vertical wall 16. The side member rear 10 is a conventional side member rear 11 described with reference to FIGS.
Similarly to 1, the front side member 100 is connected to the rear end side and extends rearward of the vehicle body along the floor pan 103.

A first reinforcement 21 is provided inside the side member rear 10 as a reinforcing member. The first reinforcement 21 has a bottom wall 22 and a pair of left and right side walls 23 rising from both sides of the bottom wall 22. The side wall 23 of the reinforcement 21 is connected to the vertical wall 16 of the side member rear 10 at the welded portion W1 indicated by the symbol x in FIG.
Spot welded. The distal end surface 21a of the reinforcement 21 extends to substantially the same position as the distal end surface 10a of the side member rear 10. The end 22 a of the bottom wall 22 of the reinforcement 21 overlaps with the end 15 a of the bottom wall 15 of the side member rear 10. Thus, the rear side member assembly formed by joining the reinforcement 21 to the side member rear 10 constitutes a first member 1A according to the present invention.

The floor side member 11 includes a bottom wall 30 and
The hat-shaped section has a pair of right and left vertical walls 31 rising from both sides of the bottom wall 30 and a flange 32 provided at an upper end of the vertical wall 31. This floor side member 11 is the same as the conventional floor side member 11 described with reference to FIGS.
Similarly to 2, it is connected to the rear end side of the side member rear 10 via the connection portion Q, and extends rearward of the vehicle body along the floor pan 103.

A second reinforcement 40 is provided inside the floor side member 11 as a reinforcing member.
The reinforcement 40 has a bottom wall 41 and a pair of left and right side walls 42 rising from both sides of the bottom wall 41. Second
The side wall 42 of the reinforcement 40 is spot-welded to the vertical wall 31 of the floor side member 11 at a welded portion W2 indicated by a symbol X in FIG. Second Reinforce 4
0 is the front end surface 40a of the floor side member 11.
It extends to almost the same position as 1a. Thus, the floor side member assembly formed by joining the reinforcement 40 to the floor side member 11 constitutes the second member 1B according to the present invention.

At the end of the bottom wall 41 of the second reinforcement 40, a notch 45 having an open front is formed as an example of a cutout. A pair of left and right extending portions 4 functioning as a part of the overlap wall according to the present invention are provided on both sides of the notch 45, that is, at positions avoiding the following spot welded portions W3.
6 are formed, and a pair of left and right overlapping walls 50 extending in the direction of the front end face 11 a along the vertical wall 31 of the floor side member 11 is formed on the side wall 42 of the reinforcement 40.

As shown in FIG. 2 or FIG. 3, in a state where both ends of the side member rear 10 and the floor side member 11 are overlapped, the overlap wall 50 is connected to the end 23 a of the side wall 23 of the first reinforcement 21. It is designed to overlap. Extensions 46 located on both sides of notch 45
Is overlapped with the end 22 a of the bottom wall 22 of the first reinforcement 21. Here, the overlap wall 50 is directly connected to the end 2 of the side wall 23 of the first reinforcement 21.
Although not joined to 3a, it is connected to the side member rear 10 and the floor side member 11 by welding portions W5 and W3 located above and below the overlap wall 50.

The flange 1 of the side member rear 10
7 is lowered by one step corresponding to the thickness of the flange 32 of the floor side member 11, and
When the end portion 32a of the flange 32 of the floor side member 11 is overlapped on the end portion 17a of the flange 17 of the "0", the upper surface heights of the two are made substantially flush.

To connect the side member rear 10 and the floor side member 11, the floor side member 11 is stacked from above the side member rear 10 as shown in FIG. By doing so, the end 15a of the bottom wall 15 of the side member rear 10 and the bottom wall 2 of the first reinforcement 21 are formed.
2 and the bottom wall 30 of the floor side member 11
End portions 30a overlap each other. The three overlapped portions are spot-welded at a welded portion W3 indicated by a black triangle in the drawing.

In the case of this embodiment, the end 23a of the side wall 23 of the first reinforcement 21 and the second reinforcement 4
Since the overlap walls 50 of the side walls 42 overlap each other and the reinforcements 21 and 40 are not interrupted in the longitudinal direction, for example, the first phosphorus Force 2
The end 23a of the first side wall 23 and the overlap wall 50 of the second reinforcement 40 are caused by a first load caused by a bending load.
By suppressing the deformation of the side wall of the side member (side member rear 10) and the side wall of the second side member (floor side member 11), the connecting portion Q is less likely to be deformed. Since the cross section of the side member 2 is hardly crushed in the vertical direction, the strength does not decrease sharply. (If the cross section is crushed vertically by such plastic deformation, the section modulus becomes smaller in proportion to the square of the vertical height. Become). In particular, in the case of a vehicle collision test, the deformation proceeds until the product of the load and the displacement becomes constant.Therefore, there is no sharp decrease in strength even after the deformation starts, so the amount of deformation in the above-mentioned form should be reduced. Can be.

Furthermore, the surface deformation of the end 30a of the bottom wall 30 of the floor side member 11 is suppressed by the extending portions 46 on both sides of the notch 45 formed in the bottom wall 41 of the second reinforcement 40. And the strength of the connecting portion Q can be further increased. And, since the welded portion W3 is spot-welded in three layers, welding quality can be sufficiently guaranteed.

The floor side member 11 shown in FIG.
As in the modification of the first embodiment, the distal end portions of a pair of left and right extending portions 46 located on both sides of a hole 45 a as one form of a cut portion formed at an end portion of the second reinforcement 40 are connected to each other by connecting walls 60.
May be connected by

FIGS. 5 to 7 show a second embodiment of the present invention. In this embodiment, the side member rear 10
The position of the distal end surface 21a of the first reinforcement 21 provided at the front side is stopped short of the distal end surface 10a of the side member rear 10, and the bottom wall 30 of the floor side member 11 is
A step 70 corresponding to the plate thickness of the first reinforcement 21 is formed at the end of the first reinforcement 21, and the end of the bottom wall 22 of the first reinforcement 21 is formed on the lower surface side of the region on the tip 11 a side from the step 70. 2
2a is overlapped. Further, a pair of left and right extending portions 46 and an overlap wall 50 similar to the above-described embodiment are formed on both sides of the notch 45 formed at the end of the second reinforcement 40.

In this embodiment, as shown in FIGS. 6 and 7, when the end of the floor side member 11 is overlapped from above the side member rear 10, a part 15b of the bottom wall 15 of the side member rear 10 and the first Reinforce 21
Of the bottom wall 22 and the end 30a of the bottom wall 30 of the floor side member 11 overlap each other. Then, spot welding is performed on the three stacked portions at a welded portion W3 indicated by a black triangle in the drawing. At the same time, the end 15a of the bottom wall 15 of the side member rear 10 and the floor side member 1
A portion 30b of the first bottom wall 30 and a second reinforcement 40;
Is spot-welded at a portion where the part 41b of the bottom wall 41 overlaps with a welding portion W4 indicated by a white triangle in the drawing.

In this embodiment, too, the overlapping wall 5
0 overlaps the end 23a of the side wall 23 of the first reinforcement 21 and is connected to the upper and lower welded portions W3 and W5 via the side member rear 10 and the floor side member 11. As in the first embodiment, the amount of deformation of the connecting portion Q can be reduced. 1, 2, 3 and 4 showing the first and second embodiments, FIG. 11 and FIG.
The floor pan is omitted as in FIG.

In each of the above embodiments, the side member rear 10 and the reinforcement 21 are the first member 1 according to the present invention.
A, the floor side member 11 and the reinforcement 4
0 constitutes the second member 1B referred to in the present invention,
The first member 1A may be constituted by a body member other than the side member rear 10, and the second member 1B may be constituted by a body member other than the floor side member 11.

Further, in the above-described embodiment, the case where the extension 46 is provided is shown, but the extension 46 may not be provided. In addition, the members corresponding to the first side member and the second side member only need to have a hat-shaped connection portion, and the shape of a portion other than the connection portion may not be a hat shape.

[0029]

According to the connecting structure of the vehicle body member according to the first aspect of the present invention, the first portion is formed at the connecting portion between the side members while ensuring high welding quality by up to three spot welds. A portion where the reinforcement is interrupted due to the overlap of the reinforcement and the second reinforcement can be eliminated, and a connecting portion with high strength can be realized.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a connecting portion of first and second side members according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a state where the first and second side members shown in FIG. 1 are connected.

FIG. 3 is a sectional view of a side member connecting portion shown in FIG. 2;

FIG. 4 is a perspective view showing a modified example of the reinforcement.

FIG. 5 is an exploded perspective view of a connecting portion of first and second side members according to a second embodiment of the present invention.

6 is a perspective view showing a state where the first and second side members shown in FIG. 5 are connected.

FIG. 7 is a sectional view of the side member connecting portion shown in FIG. 6;

FIG. 8 is a perspective view of a part of a vehicle body provided with side members.

FIG. 9 is a plan view of a part of the vehicle body shown in FIG. 8;

FIG. 10 is a side view of a part of the vehicle body shown in FIG. 8;

FIG. 11 is an exploded perspective view of a connecting portion of a conventional side member.

FIG. 12 is a sectional view of a connecting portion of the conventional side member shown in FIG. 11;

[Explanation of symbols]

 1A: first member 1B: second member 10: side member rear (first side member) 11: floor side member (second side member) 21: first reinforcement 40: second reinforcement 50 … Overlap wall

Claims (1)

[Claims] 1. A connecting structure for connecting a first member and a second member as a vehicle body member, wherein the first member includes a first side member having a hat-shaped cross section and the first side member. A first reinforcement joined to the inside of the member and having a bottom wall and side walls extending in a longitudinal direction of the first side member, wherein the second member includes a second side member having a hat-shaped cross section; A second reinforcement joined to the inside of the second side member and having a bottom wall and a side wall extending in a longitudinal direction of the second side member, wherein an end of the bottom wall of the second reinforcement has An end of a bottom wall of the first side member, an end of a bottom wall of the first reinforcement, and an end of a bottom wall of the second side member respectively corresponding to the cut portion. And spot welding And an overlap wall extending at a position avoiding the spot to be spot-welded and overlapping the end of the side wall of the first reinforcement is provided at the end of the side wall of the second reinforcement. A connection structure for a vehicle body member.