JP3593191B2 - How to install the seat belt anchor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of attaching a seat belt anchor to a center pillar or a rear pillar of a vehicle body that is formed hollow by extrusion.
[0002]
[Prior art]
Conventionally, the center pillar of a vehicle body is formed in a box-shaped closed cross section by press forming a sheet metal. It is necessary to prevent the mounting portion from being deformed. For this purpose, it is common practice to provide a reinforcing bracket for increasing the contact area with the center pillar in the mounting portion of the anchor nut so as to disperse the stress.
[0003]
By the way, in the case of a structure in which a closed cross-section is obtained by a combination of press-formed products, a bracket is welded together with an anchor nut to the inner surface of one half in advance, and the other half is fitted over the bracket, and the joining end of the two is joined. The edges can be spot welded.
[0004]
[Problems to be solved by the invention]
However, since this method cannot be applied to an extruded product originally formed integrally with a closed section, in the case of an extruded product, an anchor nut had to be welded to the outer surface. However, when the anchor nut is provided on the outer surface, it is difficult to disperse the stress on the abutting surfaces as in the case where the bracket is applied to the inner surface, so that it has been difficult to enhance the reinforcing efficiency.
[0005]
The present invention was devised with the object of improving the problem imposed on the prior art, that is, the difficulty in enhancing the efficiency of reinforcing the mounting portion of the seat belt anchor to the hollow member formed by extrusion. It was done.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, in the present invention, a bracket to which an anchor nut is fixed in advance is inserted into the hollow member from the open surface at the end of the hollow body frame component member, and the bracket is attached to the axis of the hollow member. The bracket that moves in the hollow member is positioned by hitting a projection provided to project into the hollow member in a direction orthogonal to the bracket.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0008]
1 to 3 show a main part of a center pillar to which the present invention is applied. The center pillar 1 is formed in a hollow shape by extruding a light metal material such as aluminum, for example, and similarly to a known vehicle body structure, a vertical direction is connected so as to connect between a side sill and a roof side rail (not shown). Has been extended.
[0009]
On the outer surface of the center pillar 1 on the vehicle interior side, a shoulder through ring 2 of a seat belt is fixed with an anchor bolt 3. The anchor bolt 3 is screwed to an anchor nut 4 fixed to an inner surface of a hollow wall of the center pillar 1 on the vehicle interior side.
[0010]
The outer diameter of a general nut is about twice as large as the diameter of the bolt to be screwed. When the load of the seat belt applied to the anchor bolt is received only on the contact surface of the anchor nut with the center pillar, the center pillar has a larger diameter. The surface pressure of the nut mounting portion becomes excessive, and the portion is easily deformed. In order to disperse the stress, it is necessary to interpose a reinforcing bracket for increasing the contact area of the anchor nut with the center pillar in the mounting portion of the anchor nut. However, in the case of a hollow material formed by extrusion molding, it is substantially impossible to fix such a reinforcing bracket inside the center pillar in advance.
[0011]
Therefore, in the present invention, the anchor nut 4 is previously welded to the groove-shaped inner surface of the bracket 5 having a U-shaped cross section, and this is inserted into the hollow closed cross section of the extruded center pillar 1 from the upper open surface. It was to be introduced.
[0012]
The bracket 5 to which the anchor nut 4 has been welded falls within the closed section of the center pillar 1 and stops at the positioning pin 6 that protrudes into the closed section in accordance with the fastening position of the bracket 5. The positioning pin 6 is pulled out after the bracket 5 is fixed to the inner surface of the center pillar 1. Here, a V-shaped notch 7 is formed at an end of the bracket 5 so that the center of the center pillar 1 and the center of the bracket 5 are aligned with each other.
[0013]
The center pillar 1 has a hole 8 (a fool hole) for loosely inserting a tapping screw. On the other hand, a prepared hole 9 for a tapping screw is formed in the bracket 5 in advance. Since these positions are aligned with each other when the bracket 5 stops against the positioning pin 6, when the tapping screw 10 is inserted into the center pillar 1 from the fool hole 8, A tapping screw 10 can be screwed into the hole 9. When the tapping screw 10 is screwed into the pilot hole 9 of the bracket 5, the bracket 5 is drawn to the inner surface of the center pillar 1 and comes into close contact therewith.
[0014]
Thus, the load applied to the anchor bolt 3 screwed to the anchor nut 4 acts on the entire surface of the bracket 5 in contact with the inner surface of the indoor wall of the center pillar 1 and is dispersed.
[0015]
As means for positioning the bracket 5 within the closed cross section of the center pillar 1, as shown in FIG. 4, a cut is made at an appropriate position of the center pillar 1, and that portion is bent inward to provide a projection 11. good. As a method of fixing the bracket 5 to the inner surface of the center pillar 1, a method depending on the fastening force of only the anchor bolt 3 may be used. A method in which the surface of the bracket 5 to be viewed and the inner peripheral edge of the hole are fixed by MIG welding may be used together.
[0016]
【The invention's effect】
As described above, according to the present invention, the seat belt anchor can be easily provided in the closed cross section of the extruded product. In particular, since the closed cross section of the extruded product can be used as it is as an insertion guide for the reinforcing bracket, the mounting direction of the bracket can be made constant without any effort, and the work can be facilitated. In addition, since the bracket can be fixed with a tapping screw, there is no need to largely change the manufacturing equipment.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a vehicle body center pillar to which the present invention is applied.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a sectional view taken along the line III-III in FIG. 1;
FIG. 4 is a cross-sectional view similar to FIG. 1, showing another embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 center pillar 2 shoulder through ring 3 anchor bolt 4 anchor nut 5 bracket 6 positioning pin 7 notch 8 frog hole 9 pilot hole 10 tapping screw 11 protrusion

Claims (1)

A method of attaching a seat belt anchor to a hollow body frame component formed by extrusion molding,
A bracket to which an anchor nut is previously fixed is put into the hollow member from the open surface at the end of the hollow body frame component,
A seat for positioning the bracket moving inside the hollow member by abutting against a projection provided so as to protrude into the inside of the hollow member in a direction orthogonal to the axis of the hollow member. How to attach the belt anchor.

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