JP3705964B2 - Seat belt anchor mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat belt anchor mounting structure.
[0002]
[Prior art]
An example of the seat belt anchor mounting structure is disclosed in Japanese Patent Application Laid-Open No. 9-99808 “Seat belt anchor mounting method”. The seat belt anchor mounting method is shown in FIG. First, the anchor nut 4 is welded to the bracket 5 in advance, the bracket 5 is put into the hollow of the aluminum center pillar 1 from above, and the bracket 5 is applied to the positioning pin 6 and stopped. Next, the bracket 5 is attached to the center pillar 1 with the tapping screw 10, and the shoulder through ring 2 is attached to the center pillar 1 with the anchor bolt 3. At that time, the center pillar 1 and the bracket 5 are sandwiched between the anchor bolt 3 and the anchor nut 4 and brought into close contact with each other. By assembling in such a procedure, the seat belt anchor can be easily attached in the center pillar 1.
[0003]
[Problems to be solved by the invention]
There is a demand to make the material of the bracket 5 different from the material of the anchor nut 4 for the purpose of weight reduction. However, since the above attachment method is based on the premise of welding, there may be a disadvantage that a special welding method is adopted as the welding of the different materials or the welding is substantially difficult. Therefore, when the material of the bracket 5 is different from the material of the anchor nut 4, the above attachment method may not be adopted.
In the mounting method using bolts, nuts and rivets, which is a method other than welding, drilling and screwing work are indispensable, which increases the manufacturing cost.
[0004]
Further, in this mounting method, the bracket 5 is integrally attached to the center pillar 1 with the anchor bolt 3 and the anchor nut 4, and when an impact from the vehicle interior acts, the impact is directly applied to the center pillar 1 having a high rigidity. Will receive. Therefore, it can be said that there is room for improvement from the point of impact absorption of the seat belt anchor.
That is, it can be said that there is room for improvement in the point of difficulty in selecting dissimilar materials in the conventional mounting method and in terms of shock absorption.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a seat belt anchor mounting structure capable of easily mounting a steel nut on an aluminum anchor plate and efficiently absorbing an impact from the passenger compartment. It is in.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to claim 1, the body of an automobile is made of aluminum, an aluminum anchor plate is welded to the outer side of the inner panel of the body, and a nut is attached to the outer side of the anchor plate. In the seatbelt anchor mounting structure in which the bolts passed through the anchors from the inside of the vehicle are screwed into the nuts, and the seatbelt anchors are mounted on the anchor plates . The anchor plates are folded back so that the nut flanges are wrapped around one side of the rectangular plate. The other side is provided with a bent wall along the flange of the nut, provided with a small hole formed in the bent wall, and the nut has a first flange facing the folded portion, a second flange facing the bent wall, It is provided with.
[0007]
Since the anchor plate is flange-held at the folded portion, a steel nut can be easily attached to the aluminum anchor plate.
In addition, since the anchor plate has a folded portion and is made of aluminum, if an impact from the vehicle interior is applied to the anchor of the seat belt, the stress increases near the welded portion, the anchor plate bends to the outside of the vehicle, and the impact plate High absorption performance.
[0008]
According to a first aspect of the present invention, the anchor plate includes a folded portion that wraps the flange of the nut on one side of the rectangular plate, and includes a folding wall along the flange of the nut on the other side, and a small hole formed in the folding wall. The nut includes a first flange facing the folded portion, a second flange facing the folding wall, and a tongue extending from the second flange to be inserted into the small hole, and the nut tongue is inserted into the small hole. By inserting the first flange of the nut into the folded portion, the nut is held by the anchor plate, and the length from the center of the nut to the tip of the first flange is set longer from the center of the nut to the tip of the tongue. The small hole is away from the center of the nut.
[0009]
A bent wall was formed on the other side of the anchor plate, a small hole was formed in the bent wall, and a tongue was formed on the second flange of the nut. As a result, the nut can be positioned by inserting the tongue into the small hole, and the nut can be prevented from falling off until the bolt is screwed.
[0010]
Further, the small hole was moved away from the center of the nut by setting a longer distance from the center of the nut to the tip of the first flange than from the center of the nut to the tip of the tongue. The inner panel has a relatively large hole, and stress concentration tends to occur near the hole due to the tension of the seat belt. That is, since the hole of the inner panel where the stress concentration occurs and the small hole where the stress concentration occurs are separated from each other, the surface pressure (stress) is reduced and the durability can be improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals. “Front” indicates the forward side, and “rear” indicates the opposite side.
FIG. 1 is a perspective view of a driver's seat provided with a seat belt according to the present invention, showing that the driver's seat 11 is provided in an aluminum body 12 and the seat belt 13 is attached to the center pillar 14 of the body 12.
[0012]
The seat belt 13 includes a retractor 21 attached to the lower portion of the center pillar 14, a webbing 22 wound around the retractor 21, an upper attachment 23 attached to the upper portion of the center pillar 14, and a lower attachment 24 attached to the lower portion. A three-point seat belt comprising a tongue plate 25 provided in the webbing 22 and a buckle 26 attached to the lower left portion of the driver's seat 11.
[0013]
2 is a cross-sectional view taken along the line 2-2 in FIG. 1. The upper fixture 23 fixes the anchor plate 31 to the inner panel 29 of the center pillar 14, attaches the nut 32 to the anchor plate 31, and attaches the anchor plate 31 to the anchor plate 31. It shows that the anchor 34 is attached with the bolt 35 through the collar 33. Reference numeral 36 denotes an interior material.
[0014]
FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. An anchor plate 31 is welded to the outer side of the inner panel 29 with welded portions W1 and W2, and a nut 32 is attached to the outer side of the anchor plate 31. It is shown that the anchor 34 of the seat belt 13 is attached to the anchor plate 31 by screwing a bolt 35 into the vehicle 32 from the inside of the vehicle.
The welded portion W1 is spot welded (nugget) at a predetermined distance H from the center of the bolt 35, and the welded portion W2 is spot welded at a pitch P.
[0015]
FIG. 4 is a perspective view of an anchor plate and a nut according to the present invention.
The nut 32 is formed by forming a flange-like flange 42 at the end of the main body 41, and the material of the nut 32 is made of steel (for example, carbon steel).
[0016]
The anchor plate 31 includes a main body portion 44, a welded portion 45 provided at a lower portion of the main body portion 44, a bolt hole 46 formed at the upper portion, and folded portions 47 and 47 formed on both sides of the main body portion 44. The folded portion 47 is formed so as to wrap the flange 42, and is formed so as to move within a range where the nut 32 does not fall off.
[0017]
Next, the process of processing the anchor plate 31 will be described.
First, aluminum or an aluminum alloy is extruded, and an extruded material having folded portions 47 and 47 is formed. Subsequently, the extruded material is cut into a predetermined length, and bolt holes 46 and the like are formed in the cut extruded material, whereby the anchor plate 31 is completed.
The inner panel 29 has a relatively large hole 49 through which the collar 33 passes.
[0018]
The operation of the seat belt anchor mounting structure described above will be described with reference to FIGS.
In FIG. 2, since the folded portions 47 and 47 are formed on both sides of the anchor plate 31, the flange 42 of the nut 32 is held by the folded portions 47 and 47 and the steel nut 32 is attached to the aluminum anchor plate 31. Can do.
Further, since the nut 32 is held by the anchor plate 31 so as to move within a range where it does not fall off, the fitting of the nut 32 is easy.
[0019]
If the nut 32 is made of steel, a predetermined strength (shear stress of the thread) can be secured, and even if the impact force F1 is applied to the bolt 35, the thread of the nut 32 is not sheared.
If the anchor plate 31 is made of aluminum, the anchor plate 31 can be easily welded to the aluminum body 12. As a result, the drilling process and the screwing process of the bolt can be omitted, and the number of parts can be reduced, so that the production cost can be reduced.
[0020]
Moreover, since the anchor plate 31 is made of aluminum, the body 12 can be further reduced in weight.
Furthermore, since the anchor plate 31 is an extruded material, the folded portions 47 and 47 can be easily formed, and the production cost can be reduced.
[0021]
FIG. 5 is an operational view of the seat belt anchor mounting structure according to the present invention.
When the impact force F2 from the vehicle interior is applied to the anchor 34 of the seat belt 13, the collar 33 penetrates the hole 49 of the inner panel 29, so that the impact force F2 directly acts on the anchor plate 31 from the collar 33. Since the anchor plate 31 receiving the impact is made of aluminum, the stress increases near the predetermined distance H, and the anchor plate 31 bends and absorbs the impact. As a result, the impact absorption effect can be improved.
[0022]
Further, since the anchor plate 31 is spot-welded at the predetermined distance H and the pitch P, the stress acting on the anchor plate 31 can be increased or decreased by arbitrarily changing the predetermined distance H and the pitch P to adjust the shock absorption. it can. Similarly, by changing the cross-sectional shape of the anchor plate 31 (increase / decrease the cross-section coefficient), the shock absorption can be adjusted.
[0023]
Next, another embodiment of the seat belt anchor mounting structure according to the present invention will be described.
FIG. 6 is a diagram showing another example of FIG. 4. The same components as those of the embodiment shown in FIG.
The nut 32 </ b> B includes a main body 41 and a flange 52 formed at the end of the main body 41. The flange 52 includes a first flange 53, a second flange 54 that faces the first flange 53, and a tongue 55 that extends from the second flange 54.
[0024]
The first flange 53 is formed by a distance L1 from the center C of the nut 32B to the tip.
The tongue 55 is formed by a distance L2 from the center C to the tip of the nut 32B. The distance L2 is longer than the distance L1.
[0025]
The anchor plate 31 </ b> B includes a folded portion 47 formed on one side 62 of the rectangular plate 61, a bent wall 64 formed on the other side 63, and a small hole 65 opened in the bent wall 64.
[0026]
FIG. 7 is a cross-sectional view of a main part of another embodiment, and corresponds to a cross-sectional view taken along line 2-2 of FIG. The same components as those in the embodiment shown in FIG.
The upper fixture 23B is obtained by fixing an anchor plate 31B to the inner panel 29, attaching a nut 32B to the anchor plate 31B, and attaching an anchor 34 to the anchor plate 31B via a collar 33 with bolts 35.
[0027]
By inserting the tongue portion 55 of the nut 32B into the small hole 65 of the anchor plate 31B and inserting the first flange 53 of the nut 32B into the folded portion 47, the nut 32B is held on the anchor plate 31B. As a result, when the impact force F1 is applied, the force acts on the folded portion 47 side as indicated by the arrow (1). However, since the folded portion 47 has no small holes, stress concentration due to the small holes occurs in the folded portion 47. The strength of the anchor plate 31B can be increased.
Further, since the tongue portion 55 of the nut 32B is inserted into the small hole 65, the nut 32B can be positioned, and the nut 32B can be prevented from dropping until the bolt 35 is screwed.
[0028]
Further, the distance L2 from the center C of the nut 32B to the tip of the tongue 55 is set longer than the distance L1 from the center C of the nut 32B to the tip of the first flange 53, so that the small hole 65 extends from the center C of the nut 32B. Moved away. That is, since the surface pressure (stress) is reduced by moving the small hole 65 where stress concentration occurs away from the hole 49 of the inner panel 29 where stress concentration occurs, the durability of the anchor plate 31B and the inner panel 29 can be improved. .
[0029]
The seat belt anchor mounting structure of FIG. 1 shown in the embodiment of the present invention is mounted on the right driver's seat, but does not limit the right and left or the type of seat.
Moreover, although the anchor plate was welded to the inner panel of the center pillar, the body is not limited to the center pillar, and any body having a predetermined strength may be used.
[0030]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
In claim 1, the anchor plate includes a folded portion that wraps the flange of the nut on one side of the rectangular plate, but includes a bent wall along the flange of the nut on the other side, and includes a small hole opened in the bent wall, Since the nut includes the first flange facing the folded portion and the second flange facing the folding wall , the steel nut can be easily attached to the aluminum anchor plate.
Further, since the anchor plate is made of aluminum, it can be welded to the inner panel of the body made of aluminum, so that welding is easy and production efficiency can be improved.
[0031]
Furthermore, when an impact from the vehicle interior acts on the anchor, the collar presses the end of the anchor plate. Since the anchor plate is made of aluminum, the stress increases at the center and absorbs shock by bending. Therefore, the impact from the passenger compartment can be absorbed efficiently, and the impact absorption effect can be further improved.
[0032]
According to a first aspect of the present invention , a bent wall is formed on the other side of the anchor plate, a small hole is formed in the bent wall, and a tongue is formed on the second flange of the nut, and the tongue is formed in the small hole. Since the nut is inserted and held on the anchor plate, the nut can be positioned and the nut can be prevented from falling off.
In addition, since the small hole is moved away from the center of the nut by setting the distance from the center of the nut to the tip of the first flange to be longer from the center of the nut to the tip of the tongue, the small hole is moved away from the hole of the inner panel. As a result, the contact area is increased, the stress is reduced, and the durability of the anchor plate and the inner panel can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a driver's seat equipped with a seat belt according to the present invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 5 is an operational view of the seat belt anchor mounting structure according to the present invention. FIG. 6 is a diagram of another embodiment of FIG. 4. FIG. 7 is a cross-sectional view of the main part of another embodiment. Explanation of symbols]
DESCRIPTION OF SYMBOLS 12 ... Body, 13 ... Seat belt, 29 ... Inner panel, 31, 31B ... Anchor plate, 32, 32B ... Nut, 34 ... Anchor, 35 ... Bolt, 42 ... Flange, 47 ... Folding part, 53 ... First flange, 54 ... second flange, 55 ... tongue, 61 ... rectangular plate, 62 ... one side of rectangular plate, 63 ... other side of rectangular plate, 64 ... bent wall, 65 ... small hole, C ... center.

Claims (1)

The body of the car is made of aluminum, an aluminum anchor plate is welded to the outside of the inner panel of the body, a nut is attached to the outside of the anchor plate, and a bolt passed through the anchor from the inside of the car is attached to this nut. In the seat belt anchor mounting structure in which the seat belt anchor is attached to the anchor plate by screwing,
The anchor plate includes a folded portion that wraps the flange of the nut on one side of the rectangular plate, but includes a folding wall along the flange of the nut on the other side, and includes a small hole opened in the folding wall,
The nut includes a first flange facing the folded portion, a second flange facing the folding wall, and a tongue extending from the second flange to be inserted into the small hole, and the nut tongue is inserted into the small hole. By inserting the first flange of the nut into the folded part, the nut is held by the anchor plate,
From the center of the nut by setting a long to the tip of the tongue from the center of the nut than to the tip of the first flange, the anchor attachment structure features and to Resid Toberuto that alienated small hole from the center of the nut.

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