JPH11291855A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the loosening of a joined part between a diffuser and a housing. SOLUTION: An air bag device is provided with a diffuser 12 for controlling the jetting-out of pressure gas, an air bag 10 inflated by the pressure gas controlling by the diffuser 12, and a housing 14 for housing the diffuser 12 and the air bag 10, an air bag attaching part 23 is provided between the diffuser 12 and the housing 14, and the diffuser 12 and the housing 14 are fixed by bolts 30 and 31 penetrating the attaching part 23. In this air bag 10 device, a relief hole having holes widened for the penetration of the bolts 30 and 31 is formed in the air bag attaching part 23, and the diffuser 12 and the housing 14 are fastened and fixed to each other by the bolts 30 and 31 while these are directly brought into surface-contact with each other by the relief hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device.

[0002]

2. Description of the Related Art Some vehicles have an airbag device as a safety means. Conventional airbag devices
For example, as shown in FIG. 6, it is attached to an opening 2b formed in the upper surface 2a of the instrument panel 2 on the passenger seat side located below the windshield of the automobile.

The airbag device 3 has a resin lid 5 held in the opening 2b via clips 4,4. The airbag device 3 is fixed to a part of a vehicle body (not shown) (for example, a steering support member), and the leg 5 of the lid 5 is connected to the airbag device 3 via coupling members 7.
a, a module housing 8 connected to 5a. Further, the airbag device 3 includes an airbag 10 that is folded and stored in an airbag storage space 9 formed by the module housing 8 and the lid 5.

The lid 5 is formed with an H-shaped cleavage groove 5b (not shown) as viewed from above. Then, the cleavage groove 5b is cleaved by the pressing force when the airbag 10 is inflated, and the portions forming the cleavage groove 5b around the roots of the legs 5a, 5a in the directions of arrows A, A ', which are separated from each other. Opening (double opening) forms a bulging opening 5c (when actually opened).

The module housing 8 accommodates a cylindrical inflator 11 for ejecting a pressurized gas (for example, gas) and a cylindrical diffuser 12 for controlling the ejection amount and the ejection direction of the pressurized gas ejected from the inflator 11. Have. Further, the module housing 8 is connected to the diffuser 12 via a coupling member 13 including an embedded bolt 13a and a nut 13b as shown in FIG. 7, and forms an airbag storage space 9 above the diffuser 12. 14 is provided. The legs 5a of the lid 5 are connected to the housing 14 via connecting members 7,7.

[0006] The airbag 10 is formed in a bag shape by laminating cloth bodies of a predetermined shape and joining their peripheral portions. One of the cloth bodies has a pressure gas inlet 10 for introducing the pressure gas of the inflator 11 jetted from the opening 12a of the diffuser 12 into the bag.
a is formed. Further, as shown in FIG. 8, the airbag 10 is provided with front and rear mounting margins 10b and 10c which cover the outer periphery of the diffuser 12 and are sandwiched between the housing 14 and the diffuser 12. I have.

The front and rear mounting margins 10b and 10c are overlapped with each other at their ends, and the bolt insertion holes 10d and 10e formed at each end are welded and fixed to the diffuser 12 by the legs of the weld bolt 13a. , And further, a housing 14 is put on the outside thereof,
By screwing a nut 13b to a leg of a weld bolt 13a protruding outward from a bolt hole 14a formed in the housing 14, the diffuser 12 and the airbag 1 are screwed.
The mounting margins 10b and 10c before and after zero and the housing 14 are integrally fastened.

In the above configuration, when the inflator 11 is actuated by applying an impact force of a predetermined value or more to the vehicle body, pressurized gas is ejected from the inflator 11 and the diffuser 12
The pressure gas is introduced into the airbag 10 from the pressure gas introduction port 10a while controlling the ejection amount and the ejection direction.

The airbag 10 is inflated with the introduction of the pressurized gas, and a part of the lid 5 is firstly cleaved along the H-shaped cleavage groove 5b by the pressure of the inflation, so that the inflation opening 5 is formed.
Simultaneously with the formation of c, the airbag 10 bulges obliquely rearward from the vehicle body through the bulge opening 5c. As a result, the airbag 10 receives the head and the like of the occupant on the passenger seat side, and protects the head and the like from coming into contact with the instrument panel 2 and the like.

[0010]

However, in such a conventional airbag apparatus, the diffuser 12, the mounting margins 10b and 10c before and after the airbag 10 and the housing 14 are welded and bolted to the diffuser 12 by welding. 13a and the nut 13b are integrally fastened, so that when the mounting margins 10b and 10c between the diffuser 12 and the housing 14 before and after the airbag 10 as a cloth body deteriorate with time, Nut 13
b may be loosened.

Further, since only one weld bolt 13a is provided with respect to the cross section shown in FIG. 6, when there is a vibration input from the outside, the diffuser 12 moves forward and backward with respect to the mounting portion of the weld bolt 13a. The nut 13b is likely to swing, which may cause the nut 13b to loosen.

When the nut 13b is loosened as described above, the reaction force when the airbag 10 is inflated is received by the bolt insertion holes 10d and 10e of the front and rear mounting margins 10b and 10c. It is necessary to sufficiently reinforce the margins 10b and 10c.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an airbag device which can solve the above-mentioned problems and can prevent a loosened portion between a diffuser and a housing.

[0014]

In order to solve the above problems, according to the first aspect of the present invention, there is provided a diffuser for controlling ejection of a pressurized gas, and an airbag inflated by the pressurized gas controlled by the diffuser. And a housing for accommodating the diffuser and the airbag, and a mounting portion of the airbag is interposed between the diffuser and the housing, and the diffuser and the housing are bolted through the mounting portion. In the fixed airbag device, a relief hole in which a hole through which a bolt penetrates is widened is formed in a mounting portion of the airbag, and the diffuser and the housing are fastened with the bolt in a state where the diffuser and the housing are in direct surface contact with the relief hole portion. It is characterized by being fixed.

In the invention described in claim 2, the bolt fastening portion between the diffuser and the housing is fastened by a plurality of bolts whose positions are shifted in a direction in which the diffuser swings in response to an external vibration input. It is characterized by having.

Further, the invention according to claim 3 is characterized in that the airbag is formed with a loop-shaped mounting portion that goes around the outer periphery of the diffuser.

In the invention described in claim 4, a positioning portion is formed between the diffuser and the mounting portion of the airbag.

[0018]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. The same or equivalent parts as those of the conventional example will be described with the same reference numerals.

First, the structure will be described. In the first embodiment, the area of the lower surface of the diffuser 12 that is connected to the housing 14 is relatively large, and the housing 14 can be metal-touched. Fastening seat 1
6 is formed. Further, a plurality of through holes 18 and 19 are formed by shifting the position in the front-back direction 17 of the vehicle body (the direction of deflection of the diffuser 12 due to external vibration input) with respect to the fastening seat surface 16. Weld nut 2
0, 21 are fixed by welding to form the diffuser 12.
Are formed with screw holes 21 and 22 (coupling members).

Then, the diffuser 1 is attached to the airbag 10.
A loop-shaped mounting portion 23 is formed so as to go around the outer periphery of the second mounting portion 2.
Further, the fastening seat surface 1 is provided at a position corresponding to the fastening seat surface 16 of the diffuser 12 in the loop-shaped mounting portion 23.
A seat relief hole 24 slightly larger than 6 is formed.

Further, positioning projections 25 (positioning portions) are formed so as to protrude outward at appropriate positions near the lower surface of the diffuser 12. Then, the loop-shaped mounting portion 23 of the airbag 10
, A positioning hole 26 (positioning portion) is formed at a position corresponding to the positioning projection 25.

Further, a plurality of screw holes 2 formed in the fastening seat surface 16 of the diffuser 12 in the housing 14.
The screw insertion holes 27,
28 are formed. Further, a positioning hole 29 is formed in the housing 14 at a position corresponding to the positioning protrusion 25.

In the figure, reference numerals 30 and 31 denote diffusers 1.
Bolts (coupling members) for fastening the housing 2 and the housing 14;
2 is the width direction of the vehicle body.

Next, the operation of the first embodiment will be described.
This will be described with reference to FIGS.

The basic operation of the airbag device is the same as that of FIG.

A relatively large fastening seat surface 16 is provided on the lower surface of the diffuser 12 at a portion where the diffuser 12 is connected to the housing 14.
Is formed in the mounting portion 23 of the airbag 10 at a position corresponding to the fastening seat surface 16 of the diffuser 12, and a seat surface relief hole 24 slightly larger than the fastening seat surface 16 is formed. Since the fastening seat surface 16 and the housing 14 can be fastened and fixed with the bolts 30 and 31 in a state where the metal touch is made on a relatively large area, even if the mounting portion 23 of the airbag 10 deteriorates with time, the bolts can be fixed. Looseness is prevented from occurring in 30, 31.

Further, a plurality of screw holes 21 and 22 are formed by shifting the position of the fastening seat surface 16 of the diffuser 12 in the front-rear direction 17 of the vehicle body, and the diffuser 12 and the housing 14 are bolted from outside by a plurality of bolts. The rigidity of the connecting portion is increased by the fastening and fixing at 30, 31, and it is possible to prevent the diffuser 12 from swinging in the front-rear direction due to external vibration input. Therefore, loosening of the bolts 30 and 31 due to deflection of the diffuser 12 is prevented.

Accordingly, the reaction force when the airbag 10 is inflated can be received by the diffuser 12 and the housing 14, so that it is necessary to reinforce the mounting portion 23 of the airbag 10 more than necessary. Can be eliminated.

Further, the fastening seat surface 16 of the diffuser 12
The screw holes 21 and 22 are formed in the airbag 10, and the loop-shaped mounting portion 23 circling the outer periphery of the diffuser 12 is formed in the airbag 10. The diffuser 12 can be inserted and assembled, and the assembling work can be reduced. In particular, since the screw holes 21 and 22 are formed on the diffuser 12 side, there are no large protrusions on the diffuser 12, and the diffuser 12 can be easily inserted into the loop-shaped mounting portion 23 of the airbag 10. Become.

At this time, a positioning projection 25 is formed so as to project outward at an appropriate position near the lower surface of the diffuser 12,
By forming the positioning holes 26 at positions corresponding to the positioning protrusions 25 in the loop-shaped mounting portion 23 of the airbag 10, the positioning accuracy between the airbag 10 and the diffuser 12 can be increased, Airbag 1
It is possible to eliminate the necessity of forming the seat clearance hole 24 in the zero loop-shaped mounting portion 23 larger than necessary.

Although the preferred embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this preferred embodiment, and the design may be changed without departing from the scope of the present invention. Included in this invention.

[0033]

As described above, according to the first aspect of the present invention, it is possible to fasten and fix the diffuser and the housing with bolts in a state where the bolt fastening portion of the diffuser and the housing is metal-touched over a wide area. Also, even if the attachment portion of the airbag deteriorates with time, loosening of the bolt is prevented.

Accordingly, the reaction force when the airbag is inflated can be received by the diffuser and the housing, so that it is not necessary to reinforce the mounting portion of the airbag more than necessary.

According to the second aspect of the present invention, the position where the diffuser swings in response to vibration input from the outside is shifted to the bolt fastening portion between the diffuser and the housing, and the bolt is fastened and fixed with a plurality of bolts. Therefore, the rigidity of the bolted portion is increased, and it is possible to prevent the diffuser from swinging in the front-rear direction due to external vibration input. Therefore, loosening of the bolt due to deflection of the diffuser is prevented.

Further, according to the third aspect of the present invention, the diffuser is inserted into the loop-shaped mounting portion of the airbag by forming the loop-shaped mounting portion around the outer periphery of the diffuser in the airbag. Becomes possible,
It is possible to reduce the labor of assembling. In particular, by forming a screw hole on the diffuser side,
Since the diffuser has no large protrusions, the diffuser can be easily inserted into the loop-shaped mounting portion of the airbag.

According to the fourth aspect of the present invention, since the positioning portion is formed between the diffuser and the mounting portion of the airbag, the positioning accuracy between the airbag and the diffuser can be increased. It is possible to exhibit a practically useful effect that it is possible to eliminate the necessity of forming the escape hole in the attachment portion of the airbag larger than necessary.

[Brief description of the drawings]

FIG. 1 is a side sectional view of Embodiment 1 of the present invention.

FIG. 2 is a schematic exploded perspective view of FIG.

FIG. 3 is a partially enlarged view of a coupling portion between a diffuser and a housing in FIG. 1;

FIG. 4 is a schematic view of the airbag of FIG. 1;

FIG. 5 is an enlarged view of a positioning unit of FIG. 2;

FIG. 6 is a side sectional view of a conventional example.

FIG. 7 is a partially enlarged view of a connecting portion between the diffuser and the housing in FIG. 6;

FIG. 8 is a schematic view of the airbag of FIG.

[Explanation of symbols]

 Reference Signs List 10 airbag 12 diffuser 14 housing 16 fastening seat surface (bolt fastening portion) 21, 22 screw hole 23 mounting portion 24 seat surface relief hole (release hole) 25 positioning projection (positioning portion) 26 positioning hole (positioning) Part) 30, 31 volts

Claims (4)

[Claims] 1. A diffuser for controlling ejection of a pressurized gas, an airbag inflated by the pressurized gas controlled by the diffuser, and a housing for accommodating the diffuser and the airbag, and a mounting portion for the airbag. Is interposed between the diffuser and the housing, wherein the diffuser and the housing are fixed by bolts penetrating the mounting portion, wherein a hole through which a bolt passes through the mounting portion of the airbag is expanded. An airbag device, wherein a relief hole is formed, and the diffuser and the housing are fastened and fixed with the bolt in a state where the diffuser and the housing are in direct surface contact with each other at the relief hole portion. 2. A bolt fastening portion between the diffuser and the housing is fastened by a plurality of bolts whose positions are shifted in a direction in which the diffuser swings in response to an external vibration input. The airbag device as described in the above. 3. The airbag device according to claim 1, wherein a loop-shaped mounting portion is formed around the outer periphery of the diffuser on the airbag. 4. The airbag device according to claim 1, wherein a positioning portion is formed between the diffuser and the mounting portion of the airbag.