JPH0456688A - Automobile lower body structure - Google Patents

Abstract

PURPOSE:To improve the rigidity of a body at the time of side collision by jointing the middle part of the side sill inner panel of a side sill in the lower body structure of an automobile to a side sill outer panel so as to form plural closed cross sections vertically at the side sill. CONSTITUTION:A side sill 8 is jointed to a joint protruding toward the rear part of a body from below so as to correspond to a door opening part provided at the lower part of a front pillar 3. This side sill 8 extended in the body longitudinal direction is provided with a side sill outer panel 17 and a side sill inner panel 18, and both upper and lower ends of the panels 17, 18 are jointed to form closed cross section between the side sill outer panel 17 and side sill inner panel 18. The middle part of the side sill inner panel 18, the rigidity demanded part corresponding to the door opening part, is bendingly formed into outward protruding shape and bonded to the side sill outer panel 17 by a spot-welding means so as to form plural closed cross sections 19, 20 at the upper and lower parts of the side sill 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to, for example, a lower body structure of an automobile including a side sill extending in the longitudinal direction of the vehicle body.

(Prior Art) Conventionally, as a lower body structure of an automobile of the above-mentioned example, there is a structure described in, for example, Japanese Utility Model Application Publication No. 1-145587.

In other words, in a side sill structure that includes a side sill inner, a side sill outer, and a side sill reinforcement, the side sill inner and the side sill outer are fixed across the side sill reinforcement at approximately the center of the upper part, and the lower end of the side sill reinforcement is attached to the vehicle body side. The lower end of the side sill inner, which is bent in a substantially horizontal direction, is fixed to the substantially horizontal part of the floor panel of the body main body, and the lower end of the side sill outer is fixed to the lower surface of the bent part of the lower end of the side sill reinforcement. Meanwhile, the lower side surface of the side sill inner is fixed to the tip of the floor panel that is bent upward, and a first closed cross section extending in the longitudinal direction of the vehicle body is formed between the side sill inner and the side sill reinforcement. In addition, a second closed section extending in the longitudinal direction of the vehicle body is formed between the side sill reinforcement and the side sill outer, and these first and second closed sections are arranged side by side in the vehicle width direction in a typical side sill structure. It is.

The above-mentioned side sill structure has the advantage of being able to improve vehicle body rigidity due to the two left and right closed cross-section structures, but on the other hand, since there is no part extending in the vehicle width direction in the closed cross sections, it is difficult to ensure vehicle body rigidity in the event of a side collision. I have doubts about this.

(Object of the Invention) This invention utilizes the significance of spot welding to the side sill outer panel when the outer panel of the vehicle body is formed of resin to improve the rigidity of the vehicle body in the event of a side collision. The purpose is to provide car body structures.

(Structure of the Invention) The present invention relates to a lower body structure for an automobile having a side sill, wherein the side sill connects an intermediate portion of a side sill inner panel to a side sill outer panel to form a plurality of upper and lower closed cross sections. It is characterized by a structure.

(Effects of the Invention) According to the present invention, since the intermediate portion of the above-mentioned side sill inner panel is joined to the side sill outer panel, this joining structure allows the lower part of the upper closed section to be connected to the upper part of the lower closed section. The above-mentioned side sill inner panels inevitably form walls that extend in the vehicle width direction, and these upper and lower walls can resist side collision loads, making it possible to improve vehicle body rigidity in the event of a side collision. This has the effect of reliably preventing deformation of the side sills and the passenger compartment.

(Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows the lower body structure of an automobile, in which a front pillar inner 1 and a front pillar outer 2 are joined to provide a front pillar 3 having a pillar closed cross section extending diagonally in the vertical direction. The lower part of the pillar 3 has a first joint part 3a that is curved inward to the vehicle body, a second joint part 3b that projects forward, and a second joint part 3b that projects from below toward the rear of the vehicle body so as to correspond to the door opening 4. It is integrally formed with the third joint portion 3c.

Then, the cowl side of the cowl box 6 having the cowl closed section 5 is joined to the first joint part 3a of the front pillar 3 described above, and the rear end of the apron reinforcement men door is joined to the second joint part 3b. A side sill 8 extending in the longitudinal direction of the vehicle body is joined to the third joint portion 3C at the lower part of the vehicle body.

The above-mentioned cowl box 6 has a dash upper panel 10 having an inverted cross section joined to the upper end of a dash lower panel 9 that partitions a front trunk room and a passenger compartment in a midship engine vehicle. It is a box in which a cowl closed section 5 extending in the vehicle width direction is formed.

Further, a suspension tower 12 formed approximately in the center of the tire house 11 is disposed at the front end of the above-mentioned darts lower panel 9, and the base is connected to both the vertical wall portion of this suspension tower 12 and the above-mentioned darts lower panel 9. A front frame 13 is provided in which parts are joined, and this front frame 13 extends toward the front of the vehicle body.

Furthermore, the above-mentioned apron reinforcement men 7 has a closed cross section 16 extending in the longitudinal direction of the vehicle body by joining the apron reinforcement collars 14 and the apron reinforcement men lowers 15, and the rear end of this apron reinforcement men door. The joint flange portions 7a, 7b, 7 are integrally formed at the rear end of the flared portion.
As shown in Figure 1, c and 7d are the top deck of the suspension tower 12, the dash upper panel 10, and the front pillar 3.
It is bonded and fixed to the first and second bonded portions 3a and 3b, respectively.

The above-mentioned side sill 8 has a side sill outer panel 17 and a side sill inner panel 18, as shown in FIG. 2, and the upper and lower ends of these panels 17 and 18 are joined.
A closed cross section is formed between the side sill outer panel 17 and the side sill inner panel 18.

In addition, the middle part of the side sill inner panel 18 corresponding to the door opening 4 where rigidity is required is bent outward in a convex shape and joined to the side sill outer panel 17 by spot welding means. A plurality of closed cross sections 19,20 are formed.

With such a coupling structure, the lower part of the upper closed section 19 and
At the upper part of the lower closed section 20, an upper wall part 21 and a lower wall part 22 which inevitably extend in the vehicle width direction are formed by the middle part of the side sill inner panel 18, and these upper and lower walls A concave space 24 is formed between the portions 21 , 22 and the joint portion 23 .

And 1. By effectively utilizing the above-mentioned concave space 24,
In addition to mounting the speaker 25, a wire harness 26 is arranged deep inside the lower part of the space 24.

In addition, the lower end of the side sill 8 described above is connected to the floor panel 27.
A synthetic resin outer panel 29 is attached to the outside of the side sill outer panel 17 using clips 28 .

As described above, since the intermediate portion of the side sill inner panel 18 is joined to the side sill outer panel 17, the above-mentioned upper and lower walls 21 and 22 are formed by this joint structure, and the upper and lower walls 21 and 22 are connected to the sides. Since the collision load can be resisted, the rigidity of the vehicle body in the event of a side collision can be improved, and deformation of the side sill 8 and the vehicle interior can be reliably prevented.

Moreover, by forming the above-mentioned concave space 24,
This has the effect of improving the degree of freedom in layout of components such as the speaker 25 and the wire harness 26.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, in which FIG. 1 is a perspective view showing a lower body structure of an automobile, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 8...Side sill 17...Side sill outer panel 18...Side sill inner panel 19.20...Closed section

Claims (1)

[Claims] (1) A lower body structure for an automobile having a side sill, wherein the side sill connects an intermediate portion of a side sill inner panel to a side sill outer panel to form a plurality of upper and lower closed cross sections.