JP2932015B2 - 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. An airbag body having a gas inlet through which a gas flows, a reinforcing cloth is sewn to a peripheral portion of the gas inlet of the airbag body, and a flameproof cloth is attached so as to cover the reinforcing cloth. The present invention relates to an airbag device in which a peripheral portion of a gas inlet of an airbag body is fixed to the base plate via a retainer.

[0002]

2. Description of the Related Art Conventionally, an airbag device has been known as a protection device for a passenger such as a vehicle. This airbag device is disclosed in Japanese Utility Model Application Laid-Open No.
There are JP-A-3-123355, JP-A-2-71053, JP-A-2-169344 and the like. FIG.
As shown in FIG. 1, a gas generator 2 is fixed to a base plate 1 attached to a fixed side such as an instrument panel or a steering wheel, and an airbag body 3 having a gas inlet 4.
Is fixed by a rivet 6 or a bolt or the like via a retainer 5, and when the gas generator 2 operates under predetermined conditions, gas instantaneously flows into the airbag body 3, and the airbag body 3 It is made to swell instantly.
Since a large tensile force is given to the peripheral portion of the gas inlet 4 of the airbag body 3 by the pressure of the combustion gas discharged from the gas generator 2, it is necessary to reinforce the peripheral portion of the gas inlet 4. For this reason, a reinforcing cloth 7 is attached, and a flameproof cloth 8 is attached to the peripheral portion of the gas inlet 4 to prevent the sewing thread at the sewn portion of the peripheral portion of the gas inlet 4 from being melted and broken by the high-temperature gas. Is mounted so as to cover the reinforcing cloth 7.

[0003]

However, in the conventional airbag apparatus, a sewn portion 9 for sewing the flameproof cloth 8 to the airbag body 3 is formed inside the inner peripheral edge of the retainer 5. Was just being. Therefore, when the retainer 5 is fixed to the rivet 6, the flameproof cloth 8 is easily turned up, and there is a possibility that the outer end of the flameproof cloth 8 is pinched by the retainer 5. Further, when the mounting hole of the retainer 5 of the airbag body 3 is formed, the mounting hole of the flameproof cloth 8 may be displaced. For this reason, the mounting operation of the retainer 5 is complicated, and an accurate and reliable mounting state cannot be obtained.
There was a fear that the strength would decrease. In addition, Japanese Unexamined Patent Publication
Although the flameproof cloth disclosed in Japanese Patent No. 169344 is sewn to the airbag body at an outer end portion separated from the retainer,
Since the sewn portion is spaced apart from the gas inlet of the airbag body, there is a possibility that these mounting holes may similarly displace when the mounting holes are formed in the airbag body, the reinforcing cloth, and the flameproof cloth. Had.

SUMMARY OF THE INVENTION An object of the present invention is to prevent the flameproof cloth from being turned up, and there is no danger that a small mounting hole of the flameproof cloth will cause a position shift. An object of the present invention is to provide an airbag device capable of performing an attaching operation easily and quickly, and obtaining an airbag main body having a desired strength without a risk of pinching an end portion of the flameproof cloth with a retainer.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an airbag having a gas generator fixed to a base plate and a gas inlet through which gas from the gas generator flows. A reinforcing cloth is sewn to the periphery of the gas inlet of the airbag body, a flameproof cloth is attached so as to cover the reinforcing cloth, and the periphery of the gas inlet of the airbag body is provided. Is fixed to the base plate via a retainer, an inner sewn portion of the flameproof cloth is formed on an airbag body side along an inner peripheral edge of the retainer, and the outer sewn portion extends along an outer peripheral edge of the retainer. An outer sewn portion of the flameproof cloth is formed on the side of the airbag body, and the outer sewn portion is close to an outer peripheral edge of the retainer.
And the hot gas from the gas generator does not hit directly
And a plurality of mounting holes for mounting the retainer are vertically penetrated between the inner sewn portion and the outer sewn portion.
Characterized in that it is formed Te.

[0006]

According to the present invention, the inner sewn portion of the flameproof cloth is formed on the airbag body side along the inner peripheral edge of the retainer, and the outer sewn portion of the flameproof cloth extends along the outer peripheral edge of the retainer. A high-temperature gas from the gas generator is formed at the position where the outer sewn portion is formed near the outer peripheral edge of the retainer and formed on the airbag body side.
Is formed is shaded from direct position, a plurality of mounting holes for mounting of the retainer on between the inner sewn portion and an outer sewing area
Since it is formed penetrating downward, when the airbag body is fixed to the base plate by the retainer, there is no danger that the end of the flameproof cloth will be turned up, and a small mounting hole for riveting the retainer will be formed. At the time of installation, there is no risk of causing a positional shift in a small mounting hole penetrating in the vertical direction,
It is easy to insert a rivet or the like, and the airbag main body can be easily and quickly mounted, so that an airbag main body having a desired strength can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an airbag device according to the present invention will be described in detail with reference to the drawings. 1 and 2 schematically show an embodiment of an airbag device according to the present invention. In the airbag device 11, the fixed side on which the base plate 13 is mounted is the instrument panel side or the steering side. And can be mounted at an appropriate position such as a door or a seat. As shown in FIG. 1, the airbag device 11 includes a gas generator 12 fixed to a base plate 13 by fixing means such as bolts and nuts, as shown in FIG.
An airbag body 14 having a gas inlet 15 into which a high-temperature gas from the gas generator 12 flows.
In FIG. 1, the airbag body 14 is shown in an elliptical shape, but the airbag body 14 is covered with a cover member (not shown) in a folded state.

Reinforcement cloths 17 and 18 are sewn to the inner surface and the outer surface of the peripheral portion of the airbag body 14 on the gas inlet 15 side, respectively. The inner-side reinforcing cloth 17 is formed larger than the outer-side reinforcing cloth 18, and the outer peripheral edge of the inner-side reinforcing cloth 17 is sewn to the airbag body 14 by itself.
9 is formed outside the outer peripheral edge 21 a of the retainer 21. The outer peripheral edge of the outer side reinforcing cloth 18 is sewn together with the airbag body 14 and the inner side reinforcing cloth 17 by double stitching, and the sewn portion 23 is similarly located outside the outer peripheral edge 21 a of the retainer 21. It is formed.

The reinforcing cloth 17 on the inner side further includes a reinforcing cloth 1
7 are laminated, and reinforcing cloths 17 and 18 are laminated.
Are sewn in a state of covering the sewn portions 19 and 23 of FIG.
The inner peripheral edge of the flameproof cloth 25 on the gas injection port 15 side is double-stitched together with the inner peripheral edge of the airbag body 14 on the gas injection port 15 side and the inner peripheral edges of the pair of reinforcing cloths 17 and 18 on the gas injection port 15 side. , And an inner sewn portion 27 is formed. The inner sewn portion 27 is formed along the inside of the inner peripheral edge 21 b of the retainer 21.

A flameproof cloth 25 is attached to the airbag body 14 along the outer periphery 21a of the retainer 21 by the reinforcing cloth 1.
The outer sewn portion 29 is sewn together with the retainer 2.
1 at a position close to the outer peripheral edge 21a of the gas generator 1
It is formed in a position where the hot gas of 2 or more does not directly hit . In the embodiment shown in FIG. 2, the gas inlet 15 is formed in a circular shape, the inner peripheral edge 21b of the retainer 21 is formed in a circular shape, and the inner sewn portion 27 of the inner peripheral edge 21b on the gas inlet 15 side.
Are formed in a circular shape. Also, the outer peripheral edge 2 of the retainer 21
The outer sewn portion 29 of the flameproof cloth 25 on the outer peripheral edge 21a side of the retainer 21 is formed in a substantially square shape. The outer peripheral edge 21a of the retainer 21
May be circular. In this case, if the outer sewn portion 29 of the flameproof cloth 25 is formed in a circular shape, the outer peripheral edge 2 of the retainer 21 can be formed.
An outer sewn portion 29 along 1a can be formed.

The sewing process of the inner and outer sewn portions 27 and 29 of the flameproof cloth 25 will be described with reference to FIG. Reinforcement cloths 17 and 1 are provided on the periphery of the gas injection port 15 of the airbag body 14.
8 to form the sewn portions 19 and 23, and then the reinforcing cloth 1
7, a flameproof cloth 25 is laminated and firstly sewn twice clockwise from the position of P1 to form an inner sewn portion 27 along the inner peripheral edge 21b of the retainer 21, and P2 slightly ahead of the position of P1
Is sewn in a substantially square shape from the position of P3, which has been moved obliquely upward from the position of P2, and an outer sewn portion 29 is formed at a position close to the outer peripheral edge 21a of the retainer 21. The sewing is terminated in a state where the sewing machine is overlapped with the position P4 slightly preceding the position.
FIG. 3 shows a case in which two belt catches are used as the reinforcing cloth 17 and the end of the suspension belt 31 is inserted and sewn between the belt catches.

After forming the inner and outer seams 27 and 29 of the flameproof cloth 25 in this manner, a plurality of small mounting holes 33 for mounting the retainer 21 may be formed. Since it is formed by piercing between the inner sewn portion 27 and the outer sewn portion 29, a small mounting hole 33 penetrating vertically through the airbag body 14, the reinforcing cloths 17, 18 and the flameproof cloth 25 is being drilled. In this case, there is no possibility that the small mounting hole 33 may cause positional deviation in the vertical direction. Further, as shown in FIG. 1, since the outer sewn portion 29 is formed outside the outer peripheral edge 21 a of the retainer 21, the high-temperature gas from the gas generator 12 hits the outer rim 21 a of the retainer 21 and the outer sewn portion 29 is formed. Does not directly receive high-temperature gas, and the outer sewn portion 29 is protected. Outer peripheral edge 2 of this retainer 21
If 1a is made higher, the protective function is further increased. In FIG. 3, reference numeral 35 denotes a gas vent hole,
A reinforcing cloth is sewn on the peripheral portion of the gas vent hole 35 as well, and a sewn portion is formed in the same manner as in the above-described sewing process.

[0013]

The construction of the airbag device according to one embodiment of the present invention has been described above. According to this construction, the inner side of the flameproof cloth is sewn to the airbag body along the inner peripheral edge of the retainer. An outer sewn portion of the flameproof cloth is formed on the side of the airbag body along the outer peripheral edge of the retainer, and the outer sewn portion is located near the outer peripheral edge of the retainer , and the gas generator Yo
Is formed at a position Rino hot gas does not hit directly, since a plurality of mounting holes for mounting of the retainer is formed to penetrate in the vertical direction between the inner sewn portion and an outer sewing portion, a retainer Therefore, when the airbag body is fixed to the base plate, there is no possibility that the end of the flameproof cloth is turned up or pinched, and the airbag body, the reinforcing cloth, A small mounting hole penetrating the flameproof cloth in the up-down direction does not cause a positional shift in the up-down direction, rivets and the like can be easily inserted, the airbag body can be easily and quickly mounted, and has a desired strength. An airbag body can be obtained, and an airbag device excellent in safety can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an airbag device according to the present invention.

FIG. 2 is a perspective view showing a relationship between a sewn portion and a retainer according to the present invention.

FIG. 3 is a partial front view of an airbag body showing a sewing portion of the present invention.

FIG. 4 is a cross-sectional view of a conventional airbag device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Airbag apparatus 12 Gas generator 13 Base plate 14 Airbag main body 15 Gas inlet 17 Reinforcement cloth 18 Reinforcement cloth 21 Retainer 21a Outer peripheral edge of retainer 21b Inner peripheral edge of retainer 25 Flameproof cloth 27 Inner sewing part 29 Outer sewing part 33 Mounting hole

Claims (1)

(57) [Claims] 1. A gas generator fixed to a base plate, and an airbag body having a gas inlet through which gas from the gas generator flows, and reinforced at a peripheral portion of the gas inlet of the airbag body. In the airbag device, a cloth is sewn, a flameproof cloth is attached so as to cover the reinforcing cloth, and a peripheral portion of a gas inlet of the airbag body is fixed to the base plate via a retainer. An inner sewn portion of the flameproof cloth is formed on an airbag body side along an inner peripheral edge of the flameproof cloth, and an outer sewn portion of the flameproof cloth is formed on an airbag body side along an outer peripheral edge of the retainer. At the position where the outer sewn portion is close to the outer peripheral edge of the retainer , and
A plurality of mounting holes for mounting the retainer are formed vertically between the inner sewn portion and the outer sewn portion, and are formed at positions where the high-temperature gas from the gas generator does not directly hit . An airbag device characterized by the above-mentioned.