JPS6294474A - Structure of junction part of body skeleton member - Google Patents

Abstract

PURPOSE:To enhance strength of a junction part by forming a bent plug-in piece through arrangement of an extended part at one of two body skeleton members and a socket portion to be jointed to the plug-in piece on the other body skeleton member. CONSTITUTION:An extended part 11 is formed on one side part of the inner panel 3 of the first body skeleton member 1 and on its side edge, a plug-in piece 12 is formed by bending. While, a socket portion 13 is formed on a flange part 7a corresponding to the plug-in piece 12 of the second body skeleton member 6. The plug-in piece 12 is inserted into the socket portion 13 and flanges 7a, 8a and the plug-in piece 12 are jointed together by spot welding whereby without using specified reinforcing members, the stacked junction part between step parts of the first and the second body skeleton members 1, 6 can be enhanced in its strength so that it can oppose sufficiently to bending load.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to connection structures for various vehicle body frame members of automobiles.

Conventional Technology When connecting vehicle body frame members in a straight line, such as connecting a front pillar lower and a front pillar upper or connecting a bus and a roof rail, the structure shown in Fig. 4.5 is exclusively used. ing.

In the figure, 1 shows a first frame member in which an outer panel 2 and an inner panel 3 form a box cross section, and a flange joint 4 at the connection side end, in this example, the lower end, for example, is connected to the outer panel 2 and the inner panel 3. The stepped portion 5 is formed by offsetting the sail downwardly.

Similarly to the first frame member 1, a second frame member 6 has a box cross section formed by an outer wall 7 and an inner panel 8, and the inner panel 8 is attached to the flange joint 9 at the upper end on the connection side. The outer panel 7 also extends upward and is offset to form a stepped portion 1o that engages with the stepped portion 5 of the first skeleton member 1.

These first skeleton members 1. The corresponding inner panels 3.8 and outer panels 2.7 of the second frame member 6 are lapped together, and the flange t-3 is overlapped at the stepped portion 5, 1°. and flanges 2a, 7a and 8a'i! This is a multi-joint method using spot welding.

Problems to be Solved by the Invention Even if the stepped portions 5 and 10 are triple-polymerized and joined like the flanges 2a, 3a, 8a and the flanges 2a, 7a, 8a, the first frame member 1 and the first frame member 1 Since the two frame members 6 simply wrap the corresponding inner panels 3, 8 and outer panels 2, 7 together, these first. Second
The point is that the strength of the joint between the stepped portions 5 and 10 cannot be ensured sufficiently against the bending load that acts on the connecting portion of the frame members 1 and 6 in the peeling direction shown by arrow F in FIG. It has been pointed out.

Therefore, the present invention provides the first method without using a special reinforcing member or the like. The present invention provides an overall structure for a connection part of a vehicle body frame member, which can increase the joint strength of a joint joint between stepped portions of a second frame member.

Means for Solving All Problems At the connecting end of either the first skeleton member or the second skeleton member, the flange joints of the contact & side ends are each formed with a stepped portion that engages with each other, and , an extension part is formed partially on the inner panel or outer panel in which the flange is sandwiched in the center by the engaging part of the step parts, and an insertion piece is provided on the side edge of the inner panel or the outer panel at a distance from the step part and on the extension of the flange. While bending and forming, a socket portion is formed at the flange joint portion of the other frame member corresponding to the insertion piece, and the insertion piece is inserted into this socket portion and joined.

Even if a bending load acts on the connecting portion between the first frame member and the second frame member in the peeling direction, the engagement between the insertion piece and the socket portion sufficiently counters the load in the peeling direction.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.

In Figures 1 to 3, outer panel 2 and inner panel 3
The outer panel 2 is attached to the inner panel 3 at the flange joint 4 at the lower end of the first frame member 1, which has a box cross section.
In addition, the outer panel 7 and the inner panel 8 form a box section at the flange joint 9 at the upper end of the second frame member 6. The panel 8 is also extended upward and offset from the outer panel 7, and the first frame member 10 step part 5
a stepped portion 10 is formed that engages with the step portion 10;
These first skeleton members 1. The corresponding inner panels 3, 8 and outer panels 2, 7 of the second frame member 6 are lapped to form flanges 2a, 3a, 8a and flanges 2m, 7m at the stepped portions 5, 10.

The basic structure is the same as that of the prior art in that 8a is polymerized and multi-joined by spot welding.

Here, the inner panel or the outer panel has a flange sandwiched in the center at the connecting end of either the first frame member 1 or the second frame member 6 and at the engaging portion of the stepped portions 5 and 10. For example, an extension part 11 is formed on one side of the inner panel 3 of the first frame member 1, and an insertion piece 12 is formed on the side edge of the extension part 11 apart from the step part 5 and on an extension of the flange 3a. It is bent and molded. On the other hand, a socket portion 13 is formed in the flange joint portion 4 corresponding to the insertion piece 12 on one side of the second frame member 6, and the insertion piece 1 is inserted into this socket portion 13.
2, insert flange 7#L and insert piece 12. Flange 8a' (joined by i-spot welding).

Further, in this embodiment, the extension portion 14 and the insertion piece 15 are also formed on the other side of the outer panel 7 of the second frame member 6, while the insertion piece 15 is formed on the other side of the first frame member 1. A socket portion 16 is formed in the flange joint portion 4 corresponding to the flange 2a, and the insertion piece 15 is pushed into the socket portion 16, and the flange 2a and the insertion piece 15. The flanges 3a are joined by spot welding.

According to the structure of the above embodiment, even if a bending load is applied to the connection portion between the first frame member l and the second frame member 6 in the direction of peeling as shown by the arrow F in FIG. The bending load does not act as a peeling load on the joint between the socket part 13 and the socket part 13, and on the joint between the plug-in piece 15 and the socket part 16.
This bending load can be sufficiently resisted by joining with No. 3 and No. 1. This makes it possible to further improve the joint strength of the connecting portion of the second frame members 1 and 2.

Effects of the Invention As described above, according to the present invention, either the first frame member or the second frame member has a flange extension of the inner panel or outer panel that is sandwiched in the center at the engaging portion of the stepped portions. There is an insertion piece on the side edge of the extension partially formed on the inner panel or the outer panel, and this insertion piece is inserted into a socket formed on the flange joint of the other frame member. Since the bonding is done in two steps, the bonding area is not only expanded, but also the bonding area is increased. Even if a bending load acts on the connection part of the second frame member in the peeling direction, it will not act as a peeling load on the joint between the plug-in piece and the socket part. This bending load can be sufficiently resisted by the bonding, and the bonding strength of the connection portion can be further increased. In addition, since no dedicated reinforcing member is used, there is no increase in the number of assembly man-hours and component management man-hours, which is a great practical advantage.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is a side view, and Fig. 4 is an exploded perspective view showing the conventional structure. Fig. 5 is the same side view. It is a diagram. DESCRIPTION OF SYMBOLS 1... First skeleton member, 2... Outer panel, 2a.
...Flange, 3...Inner panel, 3a...Flange, 4...Flange joint, 5...Step, 6...
- Second skeleton member, 7... Outer panel, 7a... Flange, 8... Inner panel, 8a... Flange,
9...Flange joint part, 10...Step part, 11, 1
4... Extension part, 12, 15... Insert piece, 13,
16...Socket part. Figure 4

Claims (1)

[Claims] (1) The inner panel and the outer panel are offset and engaged with each other at the flange joints at the connection side ends of the first frame member and the second frame member, each of which has a box cross section. forming a step,
Corresponding inner panels of these first and second skeleton members,
In a structure in which the outer panels are lapped together and the flanges are triple-superposed and joined at the step part, at the connection side end of either the first frame member or the second frame member, and at the step part An extension part is formed partially on the inner panel or outer panel in which the flange is sandwiched in the center by the engaging parts of the comrades, and an insert piece is bent and formed on the extension of the flange at a distance from the stepped part on the side edge of the extension part. A connection part structure for a vehicle body frame member, characterized in that a socket part is formed at a flange joint part corresponding to the insertion piece of the other frame member, and the insertion piece is inserted into the socket part and joined.