JPH0530543Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a structure for reinforcing the seat belt attachment part provided in the center pillar of an automobile so that it can withstand a large load, and in particular can improve its rigidity. This invention relates to a reinforced structure.

[Conventional technology]

Generally, a three-point seat belt is configured such that two points are attached to the floor of the vehicle body and the remaining point is attached to the upper part of the center pillar. Since a large load due to a collision or the like will be applied to the seatbelt attachment portion, it is necessary to reinforce it to ensure rigidity capable of withstanding this large load.

Conventional examples of such reinforcement structures for the center pillar portion include the structure shown in FIG. 5 and the structure shown in FIG. 6.

In the conventional structure shown in FIG. 5, a substantially U-shaped reinforcing plate 14 is arranged inside a center pillar 13 consisting of an inner pillar 11 and an outer pillar 12, and a bottom part 14a of the reinforcing plate 14 to which an anchor nut 15 is fixed is connected to the inner pillar 11. The side portion 14b is welded and fixed to the side wall portion 12a of the outer pillar 12.

In the conventional structure shown in FIG. 6, a flat reinforcing plate 16 is arranged along the inner surface of the inner pillar 11, and both side edges 16a of the reinforcing plate 14 are connected to the inner pillar 11 and the joint flange part 12 of the outer pillar 12.
It is sandwiched between a and 12b and fixed by welding.

[Problem that the invention attempts to solve]

However, in any of the above conventional structures, the reinforcing plate is only disposed along a part of the inner surface of the center pillar, and it cannot be said that the closed cross-sectional shape of the center pillar is effectively utilized. Therefore, the joint strength and the rigidity of the reinforcing plate itself have not improved much. In particular, since a large load from the seatbelt acts on this reinforcing plate downward in the drawing, in the conventional structure shown in FIG.
and the outer pillar 12 are easily sheared,
Further, in the conventional structure shown in FIG. 6, there is a problem that the welded portions of both edges 16a of the reinforcing plate 16 to the inner pillar 11 and the outer pillar 12 are likely to peel off.

Therefore, the purpose of this invention is to improve the strength of the reinforcing plate against loads in the shearing direction, peeling direction, and torsional direction, and to greatly improve the overall rigidity of the seat belt attachment part of a four-door vehicle. The present invention provides a reinforcing structure for the seat belt attachment part.

[Means for solving problems]

The present invention provides a reinforcing structure for a seatbelt attachment part of an automobile, in which a reinforcing member having an anchor nut is arranged and fixed in a center pillar formed by an inner pillar and an outer pillar.
It consists of the first to third reinforcing parts, has a roughly U-shaped cross-sectional shape opening toward the front side of the vehicle, and has a length extending from the roof part to below the center in the height direction of the center pillar. The first reinforcing part is approximately flat plate-shaped having the anchor nut, and the first reinforcing part is in contact with the inner surface of the inner pillar, and both edges thereof are sandwiched between the inner pillar and the outer pillar. The second reinforcing portion is fixed to the outer pillar by being brought into contact with the inner surface of the U-shaped bottom wall portion of the outer pillar, and the third reinforcing portion connects the first and second reinforcing portions in the vehicle width direction. , and the third reinforcing portion and the vehicle rear side wall portion of the outer pillar form a closed cross section that extends vertically.

Here, the reinforcing member in the present invention includes one in which the first to third reinforcing parts are each made into separate parts and joined together by welding, and one in which a part or all of the parts are integrally formed.

[Effect]

In the reinforcing structure according to the present invention, the first reinforcing portion fixed to the inner end in the vehicle width direction within the center pillar, the second reinforcing portion fixed to the outer end, and the third reinforcing portion extending in the vehicle width direction
Since the reinforcing member is constructed by joining at the reinforcing part, the reinforcing member is welded and fixed across the two sides of the center pillar, the inner end and the outer end, which corresponds to the increased joint area compared to the conventional structure. The strength in the peeling direction, shearing direction, and torsion direction can be improved. In addition, this reinforcing member has a roughly U-shape that opens toward the front of the vehicle.
In addition, since a closed cross section is formed by the third reinforcement part, which is the bottom wall of this U-shape, and the rear wall of the outer pillar, it has a three-dimensional shape that effectively utilizes the closed cross-sectional shape of the center pillar. The section modulus of the reinforcing member itself increases, and the overall rigidity can be greatly improved. The third reinforcing part prevents the first reinforcing part and the inner and outer pillars from separating on the rear side of the vehicle due to a large load applied diagonally from the front by the seatbelt (see arrow b in Figure 1). I can,
As a result, the mounting rigidity of the seat belt can be improved.

In addition, since the reinforcing member is roughly U-shaped with an opening on the front side, and the first and second reinforcing parts are connected by only one third reinforcing part, that is, the first reinforcing part under the large load, the inner, Since the peeling force of the front side clamping part with the outer pillar is not so large, the third reinforcement part was provided only on the rear side, so the entire center pillar can be reinforced with the minimum number of members necessary, and the increase in weight can be reduced accordingly. It can be suppressed.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figures 1 to 3 are diagrams for explaining the reinforcing structure for the seat belt attachment part of a four-door automobile according to an embodiment of the present invention, and Figure 2 is a view of the right side panel viewed from the inside of the vehicle. Side view, Figure 1 is the 2nd
It is a sectional view taken along the - line in the figure. In the figure, reference numeral 1 denotes a side panel for a four-door automobile to which the structure of this embodiment is applied, and the side panel 1 has a front door opening 1a approximately in the center and a rear door opening 1a at the rear.
b are formed respectively, and both openings 1a, 1
The boundary part b is the center pillar 2. This center pillar 2 connects an inner pillar 3 and an outer pillar 4 with respective joining flange parts 3a and 4a.
It is welded together and has a box-like closed cross-sectional shape.
It extends up and down.

The reinforcing member 5 of this embodiment is installed inside the center pillar 2.
is installed. This reinforcing member 5 is a rod-shaped member having a roughly U-shaped cross section extending from the upper end to near the lower end of the center pillar 2, and includes an inner reinforcing plate 6 as a first reinforcing portion and an outer reinforcing plate 7 as a second reinforcing portion.
It is composed of three parts: and a joint reinforcing plate 8 which is a third reinforcing part.

The inner reinforcing plate 6 is in the form of a band plate, and has a bolt hole 6a formed in its upper part, and an anchor nut 9 is welded and fixed to the inner surface of the bolt hole 6a. Also, both edges 6b of this inner reinforcing plate 6 are the joint flange portions 3 of the inner pillar 3 and the outer pillar 4.
It is inserted between a and 4a and fixed by spot welding.

The outer reinforcing plate 7 is rod-shaped with a substantially U-shaped cross section, and its base 7a is fixed to the inner surface of the outer wall 4b of the outer pillar 4 by spot welding.

The joint reinforcing plate 8 is rod-shaped with a substantially square cross section, and its upper horizontal side portion 8a is formed in a wave shape, and the welded portion between the outer reinforcing plate 7 and the outer pillar 4 is located in the recessed portion 8b. , a convex portion 8c is welded to the inner surface of the outer reinforcing plate 7. Further, the lower horizontal side portion 8d of the joint reinforcing plate 8 is welded and fixed to the inner surface of the inner reinforcing plate 6.

Further, the joint reinforcing plate 8 is located on the rear side of the vehicle within the center pillar 2, and a closed cross section a is formed by this reinforcing plate 8 and the side wall portion 4c of the outer pillar 4 located on the rear side of the vehicle.

Here, a procedure for assembling the reinforcing member 5 of this embodiment structure to the center pillar 2 will be explained.

First, in a separate process outside the side panel assembly line, the inner reinforcing plate 6, outer reinforcing plate 7, and joint reinforcing plate 8 are preliminarily welded to so-called sub-assembly as shown in FIG. Next, the outer reinforcing plate 7 portion of this reinforcing member 5 is welded and fixed to the outer pillar 4, and then both edges 6 of the inner reinforcing plate 6 are fixed.
The inner pillar 3 is arranged so that the inner pillar b is sandwiched between the joint flange part 4a of the outer pillar 4 and the joint flange part 3a of the inner pillar 3, and in this state, the joint flange parts are spot welded. Note that the end portion of the seat belt is bolted and fixed to the anchor nut 9 of the inner reinforcing plate 6.

As a result, the diagonally forward load (see arrow b in FIG. 1) applied to the anchor nut 9 via the seat belt is absorbed by the reinforcing member 5 and the center pillar 2 as a whole.

Next, the effects of this embodiment will be explained.

In the structure of this embodiment, the inner reinforcing plate 6 is positioned on the inner surface of the inner pillar 6, that is, on the inner edge of the center pillar 2, and is clamped and fixed with the outer pillar 4, and the outer reinforcing plate 7 is placed on the inner surface of the outer pillar 4, that is, on the inner edge of the center pillar 2. These reinforcing plates 6, 7 are located at the outer end and are welded and fixed to the outer pillar 4.
Since the reinforcing plate 8 is arranged to extend in the vehicle width direction within the center pillar 2, the reinforcing member 5 is welded and fixed to the inner and outer surfaces of the center pillar 2. This means that the bonding area has increased compared to the conventional structure mentioned above.
The strength of the bonded portion in the peeling direction, shearing direction, and torsion direction can be improved accordingly. The reinforcing member 5 has a three-dimensional shape that effectively utilizes substantially the entire box-shaped closed cross section of the center pillar 2. That is, the joint reinforcing plate 8 and the rear wall portion 4 of the outer pillar 4
c, another vertically extending closed section a is formed within the closed section center pillar 2, so
Thereby, a large section modulus can be ensured, and the rigidity of the reinforcing member 5 itself can be improved.

Furthermore, since the joint reinforcing plate 8 is provided only on the rear side of the vehicle within the center pillar 2, an increase in weight can be suppressed compared to a structure in which a reinforcing plate is also provided on the front side of the vehicle within the pillar 2.

In addition, since the outer reinforcing plate 7 is made into a U-shape and the upper horizontal side portion 8a of the joining reinforcing plate 8 is located approximately in the center of the outer reinforcing plate 7, the outer reinforcing plate The width of 7 can be narrowed,
As a result, the center pillar 2 can also be formed into a relatively thin shape, and the degree of freedom in design can be improved.

In the above embodiment, the outer reinforcing plate 7 and the joint reinforcing plate 8 were made into separate parts, but in the present invention, both the reinforcing plates 7 and 8 are, for example, as shown in FIG.
It may be integrally molded. In this case, the number of parts can be reduced, which has the effect of reducing manufacturing and assembly man-hours.

Furthermore, although the above embodiment describes the case of a four-door vehicle, the present invention can also be applied to a two-door vehicle. A reinforcing member having the above-described structure will be arranged.

[Effect of idea]

As described above, according to the reinforcing structure for the seat belt attachment part of an automobile according to the present invention, the reinforcing member is connected in the vehicle width direction to the first reinforcing part fixed to the inner pillar and the second reinforcing part fixed to the outer pillar. The reinforcing member has a length extending from the roof portion to below the heightwise center of the center pillar. Since the center pillar is set to have a closed cross-sectional shape, the joint area and section modulus can be increased by effectively utilizing the closed cross-sectional shape of the center pillar, and the rigidity can be improved while suppressing an increase in weight.

[Brief explanation of drawings]

1 to 3 are diagrams for explaining a reinforcing structure for a seat belt attachment part of an automobile according to an embodiment of the present invention. FIG. 3 is a side view of the right side panel to which the structure is applied, as seen from the inside of the vehicle; FIG. 3 is a side view of its reinforcing member; FIG. 4 is a cross-sectional plan view showing another embodiment of the present invention; FIG. , and FIG. 6 are cross-sectional plan views showing the conventional structure. In the figure, 2 is a center pillar, 3 is an inner pillar, 4 is an outer pillar, 4c is a rear wall part, 5 is a reinforcing member, 6 is an inner reinforcing plate (first reinforcing part), and 7
8 is an outer reinforcing plate (second reinforcing part), 8 is a joint reinforcing plate (third reinforcing part), and 9 is an anchor nut.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A reinforcing member having an anchor nut for attaching a seat belt is arranged and fixed in a closed-section center pillar consisting of a roughly flat inner pillar and a roughly U-shaped outer pillar. In the reinforcing structure for the seat belt attachment part of an automobile, the above-mentioned reinforcing member is composed of first to third reinforcing parts, has a roughly U-shaped cross section opening toward the front side of the vehicle, and has a length extending from the roof to the height of the center pillar. The first reinforcing part has a substantially flat plate shape having the anchor nut, and the first reinforcing part is in contact with the inner surface of the inner pillar, and the first reinforcing part is in contact with the inner surface of the inner pillar. is fixed to the inner and outer pillars in a state where it is held between the inner pillar and the outer pillar, the second reinforcing part is fixed by coming into contact with the inner surface of the U-shaped bottom wall of the outer pillar, and the third reinforcing part is fixed to the inner pillar and the outer pillar. A seat belt for an automobile, characterized in that the first and second reinforcing parts are connected in the vehicle width direction, and the third reinforcing part and a side wall of the outer pillar on the vehicle rear side form a closed cross section that extends vertically. Reinforced mounting structure. (2) The reinforcing structure for a seat belt attachment portion of an automobile according to claim 1, wherein the reinforcing member is formed by welding together separate first to third reinforcing portions. (3) The reinforcing member is integrally formed with the second and third reinforcing members.
A reinforcing structure for a seat belt attachment portion of an automobile according to claim 1, characterized in that a reinforcing portion and a first reinforcing portion separate therefrom are welded and joined.