JP2516117B2 - Airbag device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag apparatus for protecting an occupant in the event of a collision of a vehicle or the like. More specifically, the present invention relates to a gas generator fixed to a base plate, and a gas generator from the gas generator. The present invention relates to an airbag apparatus having a gas inlet through which air flows, an airbag body fixed to the base plate, and a cover member covering the airbag body in a housed state and having a peripheral portion fixed to the base plate. .

[0002]

2. Description of the Related Art Conventionally, an airbag device has been known as a device for protecting an occupant such as a vehicle. Examples of this protective device include Japanese Patent Publication No. 56-43890 and Japanese Utility Model Publication No. 61-1.
85642 and the like exist.

As shown in FIG. 3, a gas generator 2 is fixed to a base plate 1 mounted on the fixed side of an instrument panel, a steering wheel or the like, and an airbag body 3 having a gas inlet 4 is riveted via a retainer 5. 6 or a bolt or the like, and when the gas generator operates under a predetermined condition, the gas is momentarily released from the airbag body 3
The air bag body 3 is designed to flow in and the air bag body 3 to bulge out instantly.

With the airbag body 3 folded,
The position is regulated by a cover member 7 made of a synthetic resin, the position of which is regulated, so that the airbag body 3 does not come into contact with parts on the instrument panel side of a vehicle or the like. The periphery 7a of the cover member 7 is the end 1a of the base plate 1.
A rivet 8 or a bolt or the like is used to fix the rivet 8 through the presser plate 9. When the airbag body 3 expands, the thin portion 7b formed on the upper surface of the cover member 7 is broken, and the airbag body 3 expands forward.

[0005]

In the conventional air bag device, when the peripheral edge portion 7a of the cover member 7 is fixed by the rivet 8 or the like, the tightening amount varies, and it has the following problems. there were. First, when the rivet 8 is weakly tightened, the pressing plate 9 does not function effectively, the attachment strength of the cover member 7 becomes weak, and the vicinity of this attachment portion may be broken when the airbag body 3 swells. Had. On the other hand, when the rivet 8 is tightened too much, the strength of the cover member 7 against breakage is reduced, and
A strong clamping pressure is applied to the contact surface with the base plate 1, and the base plate 1 becomes hot when the airbag body 3 swells.
The heat generated from the heat is easily transferred to the cover member 7, and there is a risk that it will melt and fall off.

It is an object of the present invention to securely fix the cover member to the base plate with an appropriate clamping pressure by using a rivet or the like to improve the mounting strength in the peripheral portion of the cover member and to melt the base member by heat from the base plate. It is intended to provide an airbag device excellent in safety and capable of preventing the above.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a pressing plate is provided on the peripheral edge of a cover member, and a plurality of bosses are formed on the pressing plate. The plurality of bosses are fitted into a plurality of screw holes formed along the peripheral edge of the cover member, and the cover member is fixed to the base plate by screws inserted into the bosses of the pressing plate. It is characterized by

[0008]

According to the present invention, a plurality of boss portions are formed on the holding plate provided on the peripheral portion of the cover member, and the boss portions are fitted into the plurality of screw holes formed along the peripheral portion of the cover member. Since the cover member is fixed to the base plate with the screw inserted into the boss portion, a proper clamping pressure can be obtained by tightening until the tip of the boss portion hits the base plate when fixing the cover member to the base plate with a screw. The mounting strength can be improved and the cover member can be prevented from being melted by the heat from the base plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An airbag device according to the present invention will be described in detail below with reference to the drawings. 1 and 2 respectively show an outline of an embodiment of the present invention, and an airbag device 11 is a base plate to which an instrument panel side, a steering side, a side door side, a rear seat side or the like is attached as a fixed side. 12, an airbag body 15 fixed to the base plate 12, a cover member 21 and the like.

Two gas generators 13 (only one is shown) are fixed to the base plate 12 with bolts, nuts, etc., and the gas ejection port 13a side is upward from a through hole 14 formed in the base plate 12. It is designed to project. Of course, the number of gas generators 13 may be one or three or more.

The airbag body 15 is fixed to the base plate 12 with a rivet 17 and the like via a retainer 16 and is covered with a cover member 21 in a folded state. The cover member 21 is formed in a box shape with an open bottom, and screws 23 are inserted into a plurality of screw holes 27 formed in the peripheral edge portion 21a of the cover member 21 and fixed to the base plate 12 side. In the figure, reference numeral 19 is a screw hole formed in the peripheral portion 12a of the base plate 12, and reference numeral 20 is a gas injection port of the airbag body 15.

A reinforcing pressing plate 25 is attached to the peripheral edge portion 21a of the cover member 21 by the screws 23, and a plurality of boss portions 25a are formed on the back surface side of the pressing plate 25. The boss portion 25a can be formed integrally with the pressing plate 25 by injection molding or press molding, or can be integrally formed by adhering or welding a separate projecting member. In the figure, the cover member 2
Although the pressing plate 25 is attached to only one side surface of the first pressing plate 25, the pressing plate 25 may be attached to both front and rear or left and right side surfaces, or all four side surfaces.

As shown in FIG. 2, the boss portion 25a of the pressing plate 25 is fitted into the screw hole 27 of the cover member 21,
The cover member 21 is fixed to the base plate 12 by the screw 23 inserted through the boss portion 25a. Therefore, the screw hole 27 of the cover member 21 is formed in a size that allows the boss portion 25a to be fitted thereto, and the shaft portion of the screw 23 and the base plate 1 are formed.
The diameter is larger than that of the second screw hole 19. Further, the protrusion amount of the boss portion 25a is 2/3 of the wall thickness of the cover member 21.
It is preferably formed to a certain degree.

With such a structure, if the boss 23a is tightened with the rivet 23 until the tip of the boss 25a abuts the base plate 12, an appropriate clamping pressure can be maintained and the mounting strength can be improved. Further, since a strong pinching pressure is not applied to the contact surface of the cover member 21 with the base plate 12, there is no fear that the cover member 21 will be melted by the heat from the base plate 12 when the airbag body 15 is inflated, and the pressing plate 25 Positioning becomes easy when mounting
The work efficiency can be improved.

The present invention is not limited to the structure of the above-described embodiment, and it is of course possible to appropriately change the shape of each portion and use the same. For example, the shape of the boss portion 25a may be elliptical, quadrangular or the like. In addition, a heat insulating sheet or the like may be interposed between the base plate 12 and the cover member 21 to attach the screw 23.
You can stop it.

[0016]

The above is the construction of one embodiment of the airbag device according to the present invention. According to this construction, a plurality of boss portions are formed on the holding plate provided on the peripheral portion of the cover member. , The boss portion is fitted into a plurality of screw holes formed along the peripheral edge of the cover member, and the cover member is fixed to the base plate by the screw inserted into the boss portion. If you tighten until the tip of the boss hits the base plate, you can obtain an appropriate clamping pressure and improve the mounting strength.
It is possible to prevent the cover member from being melted by the heat from the base plate, and it is possible to obtain an airbag device having extremely excellent safety.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of an airbag device according to the present invention.

FIG. 2 is a sectional view of a main part of the same in an assembled state.

FIG. 3 is a schematic cross-sectional view showing a conventional airbag device.

[Explanation of symbols]

11 Airbag Device 12 Base Plate 15 Airbag Main Body 21 Cover Member 21a Peripheral Edge 23 Screw 25 Holding Plate 25a Holding Plate 27 Screw Hole

Claims (1)

(57) [Claims] 1. An air bag main body having a gas generator fixed to a base plate, a gas inlet through which gas from the gas generator flows, the air bag main body being fixed to the base plate, and the air bag main body accommodated therein. And a cover member having a peripheral edge fixed to the base plate, wherein a pressing plate is provided on the peripheral edge of the cover member, and a plurality of boss portions are formed on the pressing plate. , The plurality of bosses are fitted into a plurality of screw holes formed along the peripheral edge of the cover member, and the cover member is fixed to the base plate by screws inserted into the bosses of the pressing plate. An airbag device characterized by being