JPH07149197A - Air bag main body of air bag device - Google Patents

Abstract

PURPOSE:To provide an air bag main body of an air bag device in which a sewn part of a hanging belt is prevented from burning by gas of high temperature from a gas generator, the sewing-on work of the hanging belt is performed simply and quickly, silicone coating work is dispensable so as to reduce thickness at folding up, the strength is increased while reducing the weight, and the profitability and safety are excellent. CONSTITUTION:A hanging belt 28 is formed out of a pair of hanging belt members 31,32. The hanging belt members 31,32 are respectively formed out of a doughnut shaped base part 33 having a gas jet opening 34, and a pair of belt parts 35 outward extendingly provided from the doughnut shaped base part 33. The base parts of a plurality of hanging belt members 31,32 are respectively piled up, and sewn on along the peripheral edge of a gas injecting port, 25 formed on a foundation cloth 23 on the rear side, under the condition in which a plurality of belt parts 35 are projected outward at proper angles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag body of an airbag device for protecting an occupant in the event of a collision of a vehicle,
More specifically, the airbag main body is fixed to the base plate and swells when the gas generator is operated. The airbag main body is a rear side having a front side base cloth and a gas inlet. The present invention relates to an airbag body of an airbag device, which is formed by sewing an edge of a base cloth by sewing, and a hanging belt is sewn between the front side base cloth and the rear side base cloth.

[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. As this airbag device, Japanese Utility Model Laid-Open No. 2-43747 and Japanese Utility Model Laid-Open No. 2-1 are used.
There are Japanese Patent Laid-Open No. 23445, Japanese Patent Laid-Open No. 3-136947 and the like. Further, the present applicant has proposed an airbag device as disclosed in JP-A-3-164349 and JP-A-3-248945 as a sewing means for improving the sewing strength of the suspension belt.

As shown in FIGS. 6 to 8, a gas generator 2 is fixed to a base plate 1 mounted on a fixed side of an instrument panel, a steering wheel or the like, and a gas inlet 4 is provided.
When the gas generator 2 is operated under a predetermined condition such as an impact, the air bag body 3 having the is fixed by the rivet 6 or the bolt via the retainer 5, and the gas from the gas generator 2 is instantaneously released. Flow into the airbag body 3,
The airbag body 3 is designed to bulge instantly.

The airbag body 3 is formed by stitching the edges of a front side base cloth 3a and a rear side base cloth 3b, and at the periphery of the gas inlet 4 of the rear side base cloth 3b. Since a large tensile force is applied to 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, and therefore, the reinforcing cloth 7 and the flameproof cloth 7a are attached. .

A suspension belt 8 is sewn between the front side base cloth 3a and the rear side base cloth 3b via a belt catch 9 and the like. The suspension belt 8 prevents the airbag body 3 from bulging in one direction toward the occupant.
In the conventional airbag body 3 shown in FIGS. 6 and 7, the belt catch 9 is not sewn to the front side base cloth 3a, but the hanging belt 8 is directly sewn to the front side base cloth 3a.

Since the sewing portion 8a of the suspension belt 8 is located outside the retainer 5 as shown in FIG.
In order to prevent the sewn portion 8a of the hanging belt 8 from being burned by the high-heat gas from the gas generator, the silicone resin 10 is applied or the hanging belt 8 is covered with the flameproof cloth 7a as shown by the diagonal lines in FIG. Covers the sewn portion 8a at the end.

[0007]

In order to prevent the sewn portion 8a of the hanging belt 8 from burning due to the high-heat gas from the gas generator, silicone resin 10 is applied or it is hung with a flameproof cloth 7a. Since the sewn portion 8a of the belt 8 must be covered, the work of applying the silicone resin 10 is complicated and the workability is poor, and since heat protection is required, the weight is increased and the thickness at the time of folding is increased. The workability was poor, the cost of parts increased, and the economy was poor.

The object of the present invention is to prevent the sewing portion of the hanging belt from burning by the high heat gas from the gas generator with a simple structure, and to perform the sewing work of the hanging belt simply and quickly. An airbag for an airbag device that does not require silicone coating work, can improve workability, can reduce the thickness when folded, is lightweight, has excellent economical efficiency, and has increased strength and safety. The main body is provided.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the airbag main body of the airbag apparatus according to claim 1 of the present invention is fixed to a base plate, and An airbag body which is designed to swell when actuated, wherein the airbag body is formed by sewing the edges of a front side base cloth and a rear side base cloth having a gas inlet, and In an airbag body of an airbag device in which a hanging belt is sewn between a front side base cloth and a rear side base cloth, the hanging belt is formed of a plurality of hanging belt members, and the hanging belt member is made of gas. A donut-shaped base portion having a jetting opening, and a plurality of belt portions extending outward from the donut-shaped base portion,
The bases of the plurality of suspension belt members are respectively overlapped,
With the plurality of belt portions protruding outward at appropriate intervals, the base portions of the plurality of suspension belt members are sewn along the outer peripheral edge of the gas inlet formed in the rear side base cloth, The front end is sewn to the base fabric on the front side through a catch cloth.

Further, in the airbag body of the airbag device according to claim 2 of the present invention, the suspending belt is formed of a pair of suspending belt members, and the pair of suspending belt members each have a gas ejection opening. And a pair of belt portions extending outward from the doughnut-shaped base portion, and the pair of belt portions extending outward at appropriate intervals.

[0011]

According to the airbag body of the airbag device of the present invention, the hanging belt is formed of a plurality of hanging belt members, and the hanging belt member has a donut-shaped base portion having a gas ejection opening. And a plurality of belt portions extending outward from the donut-shaped base portion, the base portions of the plurality of hanging belt members are overlapped with each other, and the plurality of belt portions project outward at appropriate intervals. In this state, the bases of the plurality of hanging belt members are sewn along the outer peripheral edge of the gas injection port formed in the rear side base cloth, so that the sewn part of the base of the hanging belt member is close to the retainer. Or, it is located at the bottom of the retainer and can prevent combustion due to high-heat gas from the gas generator.Since it is not necessary to apply silicon to the sewing part of the hanging belt, it is possible to improve workability. The sewing work of the belt easily and quickly done,
The thickness when folded can be reduced, and the weight of the airbag body can be reduced.

According to the airbag body of the second aspect of the present invention, the hanging belt is formed of a pair of hanging belt members, and the pair of hanging belt members each have a gas ejection opening. -Shaped base portion and a pair of belt portions extending outward from the donut-shaped base portion, and the pair of belt portions extending outward at appropriate intervals reduce the number of parts In addition, it is possible to prevent combustion due to high-heat gas from the gas generator, and it is possible to improve workability by eliminating the need for silicone coating work on the sewing part of the hanging belt. The wearing work can be performed easily and quickly, the thickness when folded can be reduced, and the airbag body can be reduced in weight.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An airbag body of an airbag device according to the present invention will be described in detail below with reference to the drawings. 1 to 3 respectively show an outline of an embodiment of an airbag body of an airbag device according to the present invention. In an airbag device 11, a fixed side to which a base plate 12 is attached is fixed to an instrument panel side or a steering side. Side, and further, it is attached at an appropriate position such as the door side or the back surface of the seat back.

As shown in FIG. 6, the airbag device 11 is equipped with a gas generator 13 fixed to a base plate 12 by fixing means 14 such as bolts and nuts. The airbag main body 21 of the airbag device 11 is formed by sewing the edges of a front side base cloth 22 and a rear side base cloth 23. A gas inlet 25 into which gas from the gas generator 13 flows is formed in the rear side base cloth 23.

A suspending belt 28 is sewn between the base cloth 22 on the front side and the base cloth 23 on the rear side of the airbag body 21, and the suspending belt 28 includes a plurality of suspending belts as shown in FIG. It is formed of members 31 and 32. still,
In this embodiment, a pair of suspension belt members 31, 32 having the same shape are used, but the suspension belt members 31, 32 are not limited to the same shape. The airbag body 21 includes a retainer 16 on the base plate 12 as well as the gas generator 13.
It is fixed by fixing means 14 such as bolts and nuts via.

The hanging belt members 31 and 32 are formed with a donut-shaped base portion 33 having a gas ejection opening 34, and a plurality of belt portions 35 extending outward from the donut-shaped base portion 33. . In this embodiment, the plurality of belt portions 35 are composed of a pair of belt portions 35, 35, and the pair of belt portions 35, 35 extend outward at an appropriate angle α, in this embodiment, at an angle of approximately 90 °. It is set up.

The base 33 of the hanging belt members 31, 32
The pair of belt portions 35, 35 are overlapped with each other so as to project at an angle of approximately 90 °, and are sewn along the outer peripheral edge of the gas injection port 25 of the rear side base cloth 23. Belt catches 37 are sewn to predetermined positions on the front side base cloth 22, respectively. The belt catch 37 has a hanging belt member 31,
The end portions 35a of the plurality of belt portions 35 of 32 are sewn to form a plurality of sewn portions 39.

In this embodiment, the end portion 35 of the belt portion 35 is
Although the sewn portion 39 of a is formed at four places, it is not limited to this. Further, although the belt catch 37 is formed in an octagon, it may be formed in a polygon such as a quadrangle or a circle.

4 (a) and 4 (b) show different embodiments of the suspension belt members 31 and 32, and the portions corresponding to those of the above-mentioned embodiment are designated by the same reference numerals. Although detailed description is omitted, a plurality of belt portions 35 extending outward from the donut-shaped base portion 33 having the gas ejection openings 34 are extended outward at an angle α of approximately 180 °. It is a thing.

As shown in FIG. 4B, the belt portions 35 of the pair of hanging belt members 31 and 32 are superposed so as to form a cross shape around the gas ejection opening 34. The belt portions 35 of the pair of suspension belt members 31 and 32 are not limited to the cross shape, and may be, for example, overlapped in an X shape.

Further, as shown in FIG. 5, the suspension belt member 3
One plurality of belt portions 35 are extended outward at an angle α of about 60 °, three hanging belt members 31 are used, and the angle α of the belt portion 35 of each hanging belt member 31 is about 60 °. Alternatively, they may be overlapped with each other and sewn along the outer peripheral edge of the gas injection port 25 of the rear side base cloth 23.

Next, the sewing process of the airbag body 21 will be described. A reinforcing cloth 41 is sewn to the outside of the rear side base cloth 23, and the base portions 33 of the hanging belt members 31, 32 are paired with a pair of belt portions 35. , 35 are overlapped with each other so as to project at an angle of about 90 °, and are sewn on the inside of the rear side base cloth 23.

A belt catch 37 is sewn at a predetermined position on the front side base cloth 22. Next, the terminal is sewn with the front side base cloth 22 and the rear side base cloth 23 turned inside out. Next, the end portions 35a of the plurality of belt portions 35 of the suspension belt members 31 and 32 are sewn to the belt catch 37, respectively, and the front side base cloth 22 and the rear side base cloth 22 and the rear side base cloth 23 are formed by using the gas injection port 25 of the rear side base cloth 23. The airbag main body 21 is formed by reversing the side base cloth 23 again.

[0024]

The structure of one embodiment of the airbag main body of the airbag device according to the present invention has been described above. According to the airbag main body of the airbag device according to claim 1 of the present invention, the suspension belt is provided. Is formed from a plurality of hanging belt members,
The hanging belt member includes a donut-shaped base portion having a gas ejection opening and a plurality of belt portions extending outwardly from the donut-shaped base portion, and the base portions of the plurality of hanging belt members are overlapped with each other. Since the bases of the plurality of suspension belt members are sewn along the outer peripheral edge of the gas injection port formed in the rear side base cloth in a state where the plurality of belt parts project outward at appropriate intervals, The sewn part of the base of the hanging belt member is located close to the retainer or at the bottom of the retainer to prevent combustion due to high heat gas from the gas generator. The workability can be improved without the need for applying work, the hanging belt can be sewn easily and quickly, the thickness when folded can be reduced, and the weight of the airbag body can be reduced.

Further, according to the airbag body of the airbag device of the second aspect of the present invention, the suspending belt is formed of a pair of suspending belt members, and each of the pair of suspending belt members has a gas ejection opening. With a donut-shaped base,
It is composed of a pair of belt portions extending outward from the donut-shaped base portion, and since the pair of belt portions is extended outward at an appropriate interval, the number of parts can be reduced, In addition, it is possible to prevent combustion due to the high heat gas from the gas generator, and it is possible to improve workability by eliminating the need for silicone coating work on the sewing part of the hanging belt. Therefore, it is possible to obtain the airbag main body of the airbag device which is excellent in economy and safety when folded.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a state in which a suspension belt and a belt catch of an airbag body according to the present invention are sewn together.

3A and 3B show a suspension belt of an airbag body according to the present invention, where FIG. 3A is a front view of a suspension belt member before superposition, and FIG. 3B is a front view of a suspension belt member after superposition.

4A and 4B show different embodiments of the suspension belt of the airbag body according to the present invention, FIG. 4A is a front view of the suspension belt member before superposition, and FIG. 4B is a suspension belt member after superposition. Front view.

FIG. 5 is a front view of a suspension belt member before being stacked showing another embodiment of the suspension belt of the airbag body according to the present invention.

FIG. 6 is a cross-sectional explanatory view of a conventional airbag device.

FIG. 7 is a perspective view showing a suspension belt by cutting out a part of a conventional airbag body.

FIG. 8 is a perspective view showing a sewing portion at an end portion of a conventional hanging belt.

[Explanation of symbols]

 11 Airbag device 12 Base plate 13 Gas generator 16 Retainer 21 Airbag body 22 Front side base cloth 23 Rear side base cloth 25 Gas inlet 28 Suspension belt 31 Suspension belt member 32 Suspension belt member 33 Base portion 34 Gas ejection opening 35 Belt part 37 Belt catch 39 Sewing part

Claims (2)

[Claims] 1. An airbag body fixed to a base plate so as to swell when a gas generator operates, wherein the airbag body is a front side base cloth and a rear side base having a gas inlet. Formed by sewing the edges of the cloth,
Further, in the airbag body of the airbag device in which a suspending belt is sewn between the front side base cloth and the rear side base cloth, the suspending belt is formed of a plurality of suspending belt members, Is a donut-shaped base portion having a gas ejection opening, and a plurality of belt portions extending outward from the donut-shaped base portion, and the base portions of the plurality of suspension belt members are overlapped with each other to form a plurality of belts. The bases of the plurality of hanging belt members are sewn along the outer peripheral edge of the gas inlet formed in the rear side base cloth in a state where the parts project outward at appropriate intervals, and the tip of the belt part is An airbag body of an airbag device, which is sewn to a front side base cloth through a catch cloth. 2. The hanging belt is formed of a pair of hanging belt members, and the pair of hanging belt members each have a donut-shaped base portion having a gas ejection opening, and extend outward from the donut-shaped base portion. It consists of a pair of belt parts,
The airbag main body of the airbag apparatus according to claim 1, wherein the pair of belt portions are extended outward at appropriate intervals.