JPH03112742A - Mounting structure of front bumper stay for automobile - Google Patents

Abstract

PURPOSE:To satisfy a countermeasure for light collision with inexpensive further light-weight constitution by inserting a front bumper stay into a front side member simultaneously with the front side member stay tightened to a junction part between a vertical wall of the vertical side member and a peripheral edge flange of a first cross member. CONSTITUTION:A closed section of a first cross member 20 is butted to a front side member 1 connected to a closing plate 3 continued to a hood ledge panel 2 with a closed section formed. Here in the first cross member 20, a peripheral edge flange 23a in the terminal of at least an upper wall 23 is butted to a verticall wall 8 of the front side member 1 and spot-welded. On the other hand, a front bumper stay 14 is inserted from a front end part to the inside of the front side member 1. A bolt 29 is screwed to a weld nut 28, and the front bumper stay 14 is tightened to a connection part between upper and vertical walls 7, 8 of the front side member 1 and the above described peripheral edge flange 23a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a front bumper stay mounting structure for an automobile.

Prior Art Figures 3 to 5 show a conventional structure, in which 1 shows a closing plate 3 connected to the lower edge of the hood ledge panel 2.
The front side member 4 is joined to the inside of the front side member 1 to form a closed cross section, and the first cross member 4 is joined to this front side member 1 by abutting its closed cross section. The first cross member 4 is composed of a member element 5 having a U-shaped cross section, and a closing plate 6 joined to the member element 5 by closing the opening on the rear side. Since the first cross member 4 is arranged offset downward from the front side member 1, the first cross member 4
Both ends are formed by raising the upper wall IO to the same height as the upper wall 7 of the front side member 1, and the peripheral flange IOa of the upper wall IO is overlapped with the upper wall 7 of the front side member 1. It is then joined. Further, the peripheral flange 12a of the lower wall 12 of the first cross member 4 overlaps and joins the lower wall 9 of the front side member l, and the peripheral flanges Ila and 6a of the closing plate 6, which becomes the face wall 11 and the rear wall, are respectively at the front It overlaps and joins the vertical wall 8 of the side member 1, so that the closed cross section of the first cross member 4 abuts against the front side member 1 as described above. Then, the pumper tie 14 of the front bumper 13 is inserted from the front end of the front side member I, and bolts and nuts 15 are connected to the joint between the upper wall 7 of the front side member I and the peripheral flange IOa. There is. This similar structure is shown in, for example, Japanese Utility Model Application Publication No. 58-56654.

Problems to be Solved by the Invention The upper wall 10 of the first cross member 4 is raised up to the upper wall 7 position of the front side member l, and its peripheral flange 10a is joined to the upper wall 7 of the front side member l, Then, a pampers tie 14 is attached to the joint between the upper wall 7 and the peripheral flange 10a using bolts and nuts 15.
Since it is a joint, the peripheral flange lOa functions as a reinforcement, which has the advantage of suppressing deformation of the front side member l in the event of a minor collision of the vehicle. However, in order to form the upper wall 10 of the first cross member 4 by raising it to a large extent as described above, if the first cross member 4 is to be integrally molded up to both end portions,
Since the yield of the panel material deteriorates and press molding becomes difficult, it is necessary to separately mold the two end portions as separate pieces and divide them into three parts, and then to construct the first cross member 4 by joining these three parts. This results in a very disadvantageous cost. Therefore, the present invention allows the first cross member to bear the human force of the collision without having to arrange the upper wall of the first cross member to wrap around the upper wall of the front side member as a countermeasure against human force in the event of a light collision. Therefore, to provide a front bumper stay mounting structure for an automobile that can minimize the amount of protrusion of both ends of a first cross member, enable integral formation thereof, and obtain advantages in terms of cost and weight. It is.

Means for Solving the Problem In a structure in which the closed cross section of the first cross member is brought into contact with the front side member and joined, the upper wall end face of the first cross member is brought into contact with the vertical wall of the front side member and the end face of the first cross member is brought into contact with the vertical wall of the front side member through the peripheral flange. the front bumper stay is inserted into the front side member from its front end and fastened to the upper wall of the front side member, and the vertical wall of the front side member and the peripheral flange at the end of the upper wall of the first cross member. It is fastened at the joint part.

Effect When a collision input acts on the pampers tee in the front-rear direction during a light collision, this collision input is transmitted to the upper wall of the front side member to which the pampers tee is fastened, and is also transmitted to the vertical wall of the front side member and the upper wall of the first cross member. The force is transmitted from the joint portion of the peripheral flange to the first cross member, and the load is applied to the first cross member, thereby avoiding deformation of the upper wall of the front side member or deformation of the vehicle body panel.

Example Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In Fig. 1.2, the front side member l, which is joined to the closing plate 3 connected to the hood ledge panel 2 and forms a closed section, includes a first cross member 2.
The closed cross sections of 0 are brought into contact and connected. The first cross member 20 is composed of a member element 2I having a U-shaped cross section, and a closing plate 22 joined to the member element 2I by closing the opening on the rear side. Both ends of the first cross member 20 are formed to be slightly offset upward, with the peripheral flange 25a of the lower wall 25 overlapping the lower wall 9 of the front side member 1, and the front wall 24. Closing plate 22
The peripheral flanges 24a, 22a of the front side member I are brought into contact with the vertical wall 8, and the peripheral flange 23a at the end of the upper wall 23 is brought into contact with the vertical wall 8, thereby performing spot joining. Further, one bolt insertion hole 26 is formed in the upper wall 7 of the front side member l, and two bolt insertion holes 26 are formed in the front-rear direction at the joint portion between the vertical wall 8 and the peripheral flange 23a. On the other hand, bolt insertion holes 27 are provided in the inner surfaces of the upper wall 14a and one side wall 14b of the pumper tie 4 of the front bumper I3, corresponding to the bolt insertion holes 26.
A weld nut 28 is provided concentrically.

Then, this bread pers tie 14 is inserted into the front side member l from its front end, superimposed on the upper wall 7 and vertical wall 8 of the front side member l, and the corresponding bolt insertion holes 26 and 27 are aligned. Then, screw the bolt 29 into the weld nut 28 to connect the upper wall 7 of the front side member 2 and the vertical wall 8 of the front side member 1.
and the peripheral flange 23a at the end of the upper wall 23 of the first cross member 20.

According to the structure of the above embodiment, the collision input that acts on the pumper tee 14 in the rearward direction at the time of a light collision of the vehicle is transmitted to the upper wall 7 of the front side member l to which the pumper tee I4 is fastened, and is also transmitted vertically. The force is also transmitted to the first cross member 20 from the joint between the wall 8 and the peripheral flange 23a, and the load can be applied to the first cross member 20. Therefore, the upper wall 7 of the front side member I
The collision human force will not be concentrated on the front side member and deform it, and the human force at the time of a light collision can be sufficiently resisted, and deformation of the front side member l or the vehicle body panel can be avoided. In addition, since the human power in the event of a light collision can be efficiently borne by the first cross member 20, the upper wall 23 of the first cross member 20 can be attached to the upper wall 7 of the front side member 1 as in the conventional case. There is no need to wrap, join and reinforce the first cross member 20, and the amount of rise of the upper wall 23 of the first cross member 20 can be kept as small as possible within the plane of the vertical wall 8 of the front side member 1. It can be integrally press-molded from the center part to both ends, and the yield of the panel material will not be deteriorated.

Effects of the Invention As described above, according to the present invention, the upper wall of the first cross member is joined to the vertical wall of the front side member via the peripheral flange to minimize the amount of protrusion of the first cross member. It is now possible to press-form the first cross member in one piece from the center to both ends.
Furthermore, since the yield of panel materials does not deteriorate, it is very advantageous in terms of cost. In addition, since the front bumper stay is fastened to the joint between the vertical wall and the peripheral flange mentioned above, the collision input can be transferred from this joint to the first cross member in the event of a minor vehicle collision, so it is dedicated to the front side member. This has a great practical effect in that it is possible to avoid deformation of the front side member and the vehicle body panel without using any reinforcing material, and it is also possible to sufficiently satisfy measures taken in the event of a light collision.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing essential parts of an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a perspective view of the front part of the vehicle body, and Fig. 4 5 is a perspective view showing the main parts of the conventional structure, and FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4. l... Front side member 7... Same upper wall, same vertical wall, 14... Front bumper stay, 2 first cross member, 23... Same upper wall, 2... Peripheral flange. 8... 0... a

Claims (1)

[Claims] (1) In a structure in which the closed cross section of the first cross member abuts against and connects to the front side member, the upper wall end face of the first cross member abuts against the vertical wall of the front side member and is joined via the peripheral flange, and the front bumper The stay is inserted into the front side member from its front end and fastened to the upper wall of the front side member, and at the joint between the vertical wall of the front side member and the peripheral flange at the end of the upper wall of the first cross member. An automobile front bumper stay mounting structure characterized by a fastened structure.