JP2988513B2 - Airbag body of 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 body of an airbag device for protecting an occupant in the event of a collision of a vehicle or the like. The present invention relates to an airbag body of an airbag device formed so as to be inflated when a gas generator is operated.

[0002]

2. Description of the Related Art Conventionally, an airbag device has been known as a device for protecting an occupant of a vehicle or the like. This airbag device is disclosed in Japanese Utility Model Laid-Open No. 2-71053, Japanese Utility Model Laid-Open No. 2-4.
No. 3747, and JP-A-2-169344,
JP-A-6-278560 and the like exist.

As shown in FIG. 6, a gas generator 2 is fixed to a base plate 1 attached to a fixed side of an instrument panel, a steering wheel or the like. Alternatively, when the gas generator 2 is actuated under predetermined conditions such as impact by being fixed by bolts or the like, gas from the gas generator 2 instantaneously flows into the airbag body 3 and 3 is designed to bulge instantly.

The airbag body 3 is formed by sewing edges of a front base cloth 3a and a rear base cloth 3b as a main base cloth, and a gas inlet 4 of the rear base cloth 3b.
Since a large tensile force is applied to the peripheral portion of the gas inlet 4 by the pressure of the combustion gas discharged from the gas generator 2, the gas inlet 4
It is necessary to reinforce the peripheral portion of the base material, and a plurality of reinforcing cloths 7, flameproof cloths, and the like are sewn.

A suspension belt 8 is sewn between the front base cloth 3a and the rear base cloth 3b via a belt catch 9 or the like. The suspension belt 8 prevents the airbag body 3 from expanding in one direction toward the occupant.

FIG. 7 shows a structure in which a plurality of reinforcing cloths 7 are sewn to the periphery of the gas inlet 4 of the rear side base cloth 3b as a main base cloth. Some cloths 7 also serve as belt catches 9. Through holes 7a for the gas generator 2 are formed in the plurality of reinforcing cloths 7, and outer peripheral edges 7b are formed in substantially the same outer shape.

The rear base cloth 3b and the plurality of reinforcing cloths 7 are superimposed on each other to form upper and lower pressing members 11 and 12 as a sewing jig.
Sewing machine needle 14 at intervals of approximately 5 mm to 10 mm.
The sewing lines 15 are formed at three positions inside and outside.

[0008]

The plurality of reinforcing cloths 7 are attached to the rear base cloth 3b at a plurality of inner and outer sewing lines 15a.
When the airbag body 3 is inflated, the rigidity at the outermost peripheral position of the reinforcing cloth 7 rises at once, and the load concentrates on the rear base cloth 3b at the outermost peripheral position of the reinforcing cloth 7, and the pressure resistance is increased. There was a possibility that it might be easily broken during the strength test.

In order to solve the above problem, FIG.
As shown in FIG. 5, the outer shape of the reinforcing cloth 7 is sequentially reduced in diameter, and the number of sewing pieces of the reinforcing cloth 7 by the sewing line 15 is sequentially reduced.
It is conceivable to prevent the load from concentrating on the sewing machine. However, since the outer shape of the reinforcing cloth 7 is different, in order to fix the reinforcing members 7 to the upper and lower holding members 11 and 12 as sewing machine jigs, sewing jigs having different sizes are used. Each time, it is necessary to change it, and it is necessary to secure a margin for holding the sewing machine jig, and the outer shape of the reinforcing cloth 7 becomes large in layout, which has a disadvantage of increasing the cost of the product.

An object of the present invention is to make the outer shape of the reinforcing cloth the same, eliminate the need to change the sewing machine jig each time, and prevent the rigidity at the outermost peripheral position of the reinforcing cloth from increasing at once. There is no possibility that the load is concentrated on the main base cloth at the outermost peripheral position of the airbag, the pressure resistance can be improved, the production efficiency can be improved, and the airbag of the airbag device excellent in economy and safety can be improved. The main body is provided.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an airbag body of an airbag device according to the first aspect of the present invention expands when a gas generator is operated. In the airbag body of the airbag device thus made, the airbag body is formed by sewing a main base cloth and a plurality of reinforcing cloths, and the plurality of reinforcing cloths are formed to have substantially the same outer shape. A plurality of reinforcing cloths are sewn to the main base cloth by at least a plurality of inner and outer sewing lines, and at least one of the plurality of reinforcing cloths has a fragile portion formed therein; Are formed between the inner sewing line and the outer sewing line.

An airbag body of an airbag device according to a second aspect of the present invention is formed by sewing the edges of a front base fabric and a rear base fabric together, and further comprising a rear base fabric. An airbag for an airbag device in which a gas injection port is formed in a cloth, a plurality of reinforcing cloths are formed by sewing on a peripheral portion on a side of the gas injection port, and is inflated when the gas generator is operated. In the main body, the plurality of reinforcing cloths are formed in substantially the same outer shape, and the plurality of reinforcing cloths are sewn to the rear side base cloth by at least a plurality of inner and outer sewing lines,
A fragile portion is formed in at least one of the plurality of reinforcing cloths, and the fragile portion is formed between an inner sewing line and an outer sewing line.

The airbag body of the airbag device according to a third aspect of the present invention is formed by sewing the edges of a front base fabric and a rear base fabric together, and further comprising a rear base fabric. An airbag for an airbag device in which a gas injection port is formed in a cloth, a plurality of reinforcing cloths are formed by sewing on a peripheral portion on a side of the gas injection port, and is inflated when the gas generator is operated. In the main body, the plurality of reinforcing cloths are formed of three reinforcing cloths having substantially the same outer shape, and the three reinforcing cloths are attached to the rear side base cloth by at least a plurality of inner and outer sewing lines. No fragile portion is formed on the reinforcing cloth on the side of the three reinforcing cloths adjacent to the base fabric on the rear side, and a fragile portion is formed on another reinforcing cloth, and the fragile portion is sewn. Characterized by being formed between the inner sewing line and the outer sewing line To.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an airbag body of an airbag device according to the present invention will be described in detail with reference to the drawings. FIGS. 1 to 4 each schematically show an embodiment of an airbag body of an airbag device according to the present invention. In the airbag device, a fixed side to which a base plate is attached is defined as an instrument panel side or a steering side. It can be mounted at an appropriate position such as the door side or the back of the seat back.

As shown in FIG. 6, the airbag apparatus includes a gas generator 2 fixed to a base plate 1 by fixing means such as bolts and nuts, but the illustration and description thereof will be omitted. As shown in FIG. 2, the airbag body 21 of the airbag device is formed by sewing outer peripheral edges of a front base cloth 22 and a rear base cloth 23 as main base cloths. A gas inlet 25 into which gas from the gas generator flows is formed in the rear base cloth 23.

As shown in FIG. 1, a plurality of reinforcing cloths 27, 2 are provided at predetermined positions on a front base cloth 22 and a rear base cloth 23.
8, 29 are sewn respectively. In the embodiment of the present invention, the reinforcing cloths 27, 28 and 29 are sewn to the rear side base cloth 23, but the present invention can be applied if the number of reinforcing cloths is two or more. The reinforcing cloth sewn to the front base cloth 22 is not shown, but can be sewn in the same manner as the rear base cloth 23.

The plurality of reinforcing cloths 27, 28 and 29 are formed to have substantially the same outer shape, and the plurality of reinforcing cloths 2
7, 28 and 29 are at least a plurality of inner and outer sewing lines 3
1, 32 and 33 sewn to the rear base cloth 23 as the main base cloth.

At least one of the plurality of reinforcing cloths 27, 28, 29, in this embodiment two reinforcing cloths 2
A fragile portion 35 formed of a circular small hole is formed at 8, 29. The reinforcing cloth 27 on the side close to the base cloth 23 on the rear side is used.
Has no fragile portion 35 formed therein. Still more fragile part 35
Is not limited to the one shown in the figure, but may be one in which the fragile portion 35 is formed in the reinforcing cloth 27.

The fragile portion 35 of the reinforcing cloth 29 is formed between the inner sewing line 31 and the intermediate sewing line 32, and between the intermediate sewing line 32 and the outer sewing line 33. The fragile portion 35 of the reinforcing cloth 28 is formed between the middle sewing line 32 and the outer sewing line 33. The fragile portion 35 may be located on the sewing lines 31, 32, 33.

The fragile portions 35 formed in the reinforcing cloths 28 and 29 are not limited to those having circular small holes as shown in FIG. 4, but are rectangular as shown in FIG. Small holes, as shown in FIG. 5 (b), triangular holes, FIG.
As shown in FIG. 5C, it can be formed in various shapes such as a slit, or as shown in FIG.

Therefore, when the airbag body 21 is inflated,
The main fabric receives the gas generated from the gas generator,
By swelling in the direction of the occupant and pulling the rear base fabric 23, a plurality of inner and outer sewing lines 31, 32, 33 are provided.
The load is distributed to the plurality of reinforcing cloths 27, 28, 29.

In the outer sewing line 33, two reinforcing cloths 2
Since the fragile portion 35 formed of a circular small hole is formed in each of the reinforcing cloths 27 and 28 on the side close to the base cloth 23 on the rear side.
The load is transmitted to the reinforcing cloths 27 and 28 in the middle sewing line 32 because the fragile portion 35 formed of a circular small hole is formed in one reinforcing cloth 29 in the middle sewing line 32. In the sewing line 31, three reinforcing cloths 27, 28,
29, the load is transmitted to the plurality of reinforcing cloths 27 and 2.
The rigidity of the outermost peripheral positions of 8, 29 does not rise at once.

[0023]

The above is the configuration of the embodiment of the airbag body of the airbag apparatus according to the present invention. According to the airbag body of the airbag apparatus according to the first aspect of the present invention, The main body is formed by sewing a main base cloth and a plurality of reinforcing cloths, the plurality of reinforcing cloths are formed to have substantially the same outer shape, and the plurality of reinforcing cloths are at least a plurality of inner and outer sewing lines. Sewn to the main base cloth, a fragile portion is formed in at least one of the plurality of reinforcing cloths, and the fragile portion is formed between an inner sewing line and an outer sewing line. Since there is no fear that the load is concentrated on the main base cloth at the outermost peripheral position of the reinforcing cloth,
There is no danger that the rigidity of the main base cloth at the outermost peripheral position of the reinforcing cloth increases at once, and the pressure resistance can be improved. Further, since the plurality of reinforcing cloths are formed in substantially the same outer shape, the same Thus, there is no need to change the sewing machine jig, the production efficiency can be improved, and the airbag body of the airbag device excellent in economy and safety can be obtained.

Further, according to the airbag body of the airbag device according to the second aspect of the present invention, the airbag body is formed by sewing the edges of the front side base cloth and the rear side base cloth, and the rear side base cloth is sewn. A gas injection port is formed in a base cloth of the air bag apparatus, a plurality of reinforcing cloths are formed by sewing on a peripheral portion on the gas injection port side, and the air bag apparatus is inflated when the gas generator is operated. In the airbag body, the plurality of reinforcing cloths are formed to have substantially the same outer shape, and the plurality of reinforcing cloths are sewn to the rear base cloth by at least a plurality of inner and outer sewing lines. A fragile portion is formed on at least one of the reinforcing cloths, and the fragile portion is formed between the inner sewing line and the outer sewing line. There is no danger of the load being concentrated on the base cloth There is no danger that the rigidity of the base fabric on the rear side of the position increases at once, and the pressure resistance can be improved. Further, since the plurality of reinforcing fabrics are formed to have substantially the same outer shape, the same sewing machine A tool can be used, and there is no need to change the sewing jig, the production efficiency can be improved, and an airbag body of an airbag device excellent in economy and safety can be obtained.

Further, according to the airbag body of the airbag device according to the third aspect of the present invention, the airbag body is formed by sewing the edges of the front side base cloth and the rear side base cloth, and is formed on the rear side. A gas injection port is formed in a base cloth of the air bag apparatus, a plurality of reinforcing cloths are formed by sewing on a peripheral portion on the gas injection port side, and the air bag apparatus is inflated when the gas generator is operated. In the airbag body, the plurality of reinforcing cloths are formed of three reinforcing cloths having substantially the same outer shape, and the three reinforcing cloths are formed on at least a plurality of inner and outer sewing lines on the rear side. A fragile portion is formed on the side of the three reinforcing cloths that is close to the base fabric on the rear side, and a fragile portion is formed on another reinforcing cloth. Because the part is formed between the inner sewing line and the outer sewing line There is no possibility that the load concentrates on the rear fabric at the outermost peripheral position of the reinforcing cloth, and there is no fear that the rigidity of the rear fabric at the outermost peripheral position of the reinforcing cloth increases at once, and the pressure resistance is improved. Also, since the plurality of reinforcing cloths are formed in substantially the same outer shape, the same sewing jig can be used, and there is no need to change the sewing jig, thereby improving manufacturing efficiency. Thus, it is possible to obtain an airbag body of an airbag device excellent in economy and safety.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a sewing state of a main base fabric and a reinforcing fabric of an airbag body of an airbag device according to the present invention.

FIG. 2 is a perspective view showing a partial cross section of an airbag body of the airbag device according to the present invention.

FIG. 3 is a partial cross-sectional view for explaining the operation of the airbag device of the present invention when the airbag body is inflated.

FIG. 4 is a perspective view of a reinforcing cloth of an airbag body of the airbag device according to the present invention.

FIGS. 5A and 5B show a fragile portion of a reinforcing cloth of the airbag body according to the present invention, wherein FIG. 5A is a front view, FIG.
(C) is a front view, (d) is a front view.

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

FIG. 7 is a partial cross-sectional view showing a sewing state of a main base cloth and a reinforcing cloth of a conventional airbag body.

FIG. 8 is a partial cross-sectional view showing a sewing state of a main base fabric and a reinforcing fabric of a conventional airbag body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Airbag main body 22 Front base cloth 23 Rear base cloth 25 Gas inlet 27 Reinforcement cloth 28 Reinforcement cloth 29 Reinforcement cloth 31 Sewing line 32 Sewing line 33 Sewing line 35 Vulnerable part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60R 21/16-21/32

Claims (3)

(57) [Claims] 1. An airbag body of an airbag device adapted to inflate when a gas generator is actuated, wherein the airbag body is formed by sewing a main base cloth and a plurality of reinforcing cloths together, The plurality of reinforcing cloths are formed in substantially the same external shape, and the plurality of reinforcing cloths are sewn to the main base cloth by at least a plurality of inner and outer sewing lines,
An airbag device, wherein a fragile portion is formed in at least one of the plurality of reinforcing cloths, and the fragile portion is formed between an inner sewing line and an outer sewing line. Airbag body. 2. A gas inlet is formed by sewing the edges of the front base cloth and the rear base cloth, and a gas inlet is formed in the rear base cloth. In the airbag body of the airbag device, a plurality of reinforcing cloths are formed by sewing, and are swelled when the gas generator is activated.
The plurality of reinforcing cloths are formed in substantially the same outer shape, and the plurality of reinforcing cloths are sewn to the rear-side base cloth by at least a plurality of inner and outer sewing lines, and among the plurality of reinforcing cloths, An airbag body for an airbag device, wherein a fragile portion is formed in at least one reinforcing cloth, and the fragile portion is formed between an inner sewing line and an outer sewing line. 3. A front base fabric and a rear base fabric are formed by sewing edges of the base fabric, and a gas inlet is formed in the rear base fabric. In the airbag body of the airbag device, a plurality of reinforcing cloths are formed by sewing, and are swelled when the gas generator is activated.
The plurality of reinforcing cloths are formed of three reinforcing cloths having substantially the same outer shape, and the three reinforcing cloths are sewn to the rear base cloth by at least a plurality of inner and outer sewing lines. A fragile portion is not formed on the reinforcing cloth on the side of the three reinforcing cloths adjacent to the rear base cloth, and a fragile portion is formed on another reinforcing cloth, and the fragile portion is sewn on the inner side. An airbag body for an airbag device, which is formed between a line and an outer sewing line.