JPH11291852A - Airbag device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the number of parts of an airbag device and realize a low price. A bag formed in a bag shape and provided with an insertion hole, an inflator arranged in the bag through the insertion hole and generating a gas based on an ignition signal, and an insertion hole outside or inside the bag. The airbag device further comprises a closing cloth that covers the outer and inner surfaces more closely. As a result, the insertion hole is closely covered with the closing cloth, so that leakage of gas can be satisfactorily prevented. In addition, since the through hole is provided in the bag, the mechanical strength in the vicinity decreases. However, the through hole is tightly covered from both the outside and inside surfaces of the bag by the closing cloth, so that the mechanical strength in the vicinity of the through hole is reduced. And the bag can be favorably supported during deployment. In addition, since gas leakage is prevented by the closing cloth, the structure is simplified and the number of parts is reduced. or,
The simplification of the structure makes it possible to easily assemble the airbag device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device for protecting an occupant from an impact in a side collision. In particular, the present invention relates to a structure for preventing gas supplied from an inflator from leaking from a bag and a structure for fixing the bag.

[0002]

2. Description of the Related Art Conventionally, for example, a side airbag device for side collision has a structure shown in FIG. 4 (JP-A-8-276812). In the side airbag device 101, an opening is provided in the folded portion of the bag 54, and the periphery of the opening is sandwiched and fixed by using the support tube 52 and the holding plate 53 to secure the strength of the mounting portion of the bag 54 and This prevents the gas supplied from the inflator 55 into the bag 54 from leaking to the outside. In addition, the bag 54 is formed by sewing the periphery of a single rectangular cloth,
Since it is formed in a bag shape, suturing is easy and high productivity is obtained.

[0003]

However, in the above-mentioned prior art, in order to fix the bag 54, the support tube 5 is required.
2. Since the holding plate 53 and the plurality of screws 50 are required, there is a problem that the number of parts increases and the cost increases.

Accordingly, an object of the present invention is to achieve a cost reduction by simplifying a gas leakage prevention structure and a bag fixing structure and reducing the number of parts in an airbag device in view of the above problems. is there.

[0005]

In order to solve the above-mentioned problems, the following means are effective. That is, according to the means of claim 1, a bag formed in a bag shape and provided with an insertion hole, and an inflator arranged in the bag through the insertion hole and generating gas based on an ignition signal are provided. The airbag device is provided with a closing cloth that penetrates the insertion hole to cover the insertion hole from both the outside and inside surfaces of the bag. As a result, the insertion hole is closely covered with the closing cloth, so that leakage of gas can be satisfactorily prevented. Also, since the insertion hole is provided in the bag, the mechanical strength in the vicinity is reduced, but the insertion hole is covered from the outside or inside of the bag by the closing cloth, or from both the outside and inside surfaces, The mechanical strength near the insertion hole can be increased, and the bag can be favorably supported during deployment. Further, since gas leakage is prevented by the closing cloth, the structure is simplified, the number of parts is reduced, and the cost of the airbag device can be reduced. In addition, the airbag device can be easily assembled by reducing the number of parts.

According to the second aspect of the present invention, since at least one end of the closing cloth is fixed to the inside of the bag by sewing, the closing cloth can be sewn to the bag in advance. The bag device can be more easily assembled.

According to the third aspect of the present invention, the closing cloth reinforces mechanical strength or heat resistance against gas around the mounting portion of the inflator on the bag. In addition to better fixation, even if the bag is melted by the heat of the gas generated from the inflator, gas leakage can be satisfactorily prevented by the closing cloth.

According to the fourth aspect of the present invention, since the insertion hole is provided in a slit shape, the insertion hole can be easily formed, and the inflator can be easily inserted into the bag through the insertion hole. Can be arranged.
In addition, when the insertion hole has a slit shape, the area of the insertion hole when the opening is closed is reduced, and gas leakage can be more effectively prevented.

According to the fifth aspect of the present invention, the bag is formed in a bag shape by folding and sewing one base cloth at substantially the center, and the slit-shaped insertion hole is formed in the base cloth. Are formed so as to obliquely cross each other at substantially the center of the folded line and at the substantially center of each other. With this, while keeping the area of the insertion hole closed at the time of closing, and while maintaining the mechanical strength at the time of closing the insertion hole strong, furthermore, when disposing the inflator in the bag through this insertion hole, Thus, the area of the insertion hole at the time of opening can be further increased. Therefore, the inflator can be more easily arranged in the bag while maintaining the mechanical strength at the time of activation of the airbag device, and the productivity is further improved.

Further, according to the means of the present invention, the slit-shaped insertion hole is approximately 60 degrees apart from the folding line.
It is formed to cross diagonally with a cross angle of degrees. Thus, the shape of the insertion hole at the time of opening can be formed in a substantially equilateral triangle. Therefore, according to this means, claim 5
The means described in (5) can be more specifically implemented, and the effect of the means described in claim 5 can be obtained most significantly.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on specific embodiments. FIG. 1 is a perspective view schematically showing a configuration and a manufacturing procedure of a bag of a side airbag device 100 according to the present invention. As shown in FIG. 1 (a), the bag 1 is composed of a single base cloth 11, and FIG.
As shown in the figure, the sheet is folded in two at the folding line 13. By suturing the outer peripheral portion 14 of the folded bag 1, the bag 1 is formed in a bag shape. At approximately the center of the folded line 13 of the bag 1, the folded line 13 and approximately 60
A slit (insertion hole) 12 is provided with an intersection angle of degrees. The return line 13 passes through substantially the center of the slit 12. Further, two mounting holes 15 are provided at positions close to the return line 13. This mounting hole 15 is used for mounting an inflator described later. The closing cloth 3 includes a reinforcing portion 31 and a closing portion 32. The closing portion 32 covers the bag 1 from the outside by penetrating the slit 12 from the inside of the bag 1. The closure cloth 3 is formed such that the outer periphery of the reinforcing portion 31 is substantially U-shaped from the inside of the bag 1.
The sewing is performed at 6. On the opposite side of the reinforcing portion 31 across the slit 12, a closing portion 32 that covers the slit 12 from the outside of the bag 1 is located. The closing cloth 3 is provided with mounting holes 33 at positions corresponding to the mounting holes 15. The closing cloth 3 also has a function of reinforcing the mounting portion of the bag 1.

Next, assembling of the inflator 2 into the bag 1 will be described with reference to FIG. First, FIG.
As shown in (a), by raising the closing part 32 of the closing cloth 3, a part of the base cloth 11 including one side of the slit (insertion hole) 12 located inside the closing part 32 is temporarily removed from the closing part 32. By removing, the closing portion 32 is not covered with the slit 12. Further, as shown in FIG.
By lifting the closing part 32 together with the closing cloth 3 together with the reinforcing part 31, the slit 12 of the bag 1 is opened and opened. Next, the tubular inflator 2 is inserted into the bag 1 from the slit 12 opened. Then, slit 12
The slit 12 is closed by a procedure completely opposite to the procedure in which the slit is opened. Then, as shown in FIG. 2 (c), the projecting mounting portion 21 provided on the inflator 2 is attached to the bag 1.
Through the mounting hole 15 of the closing cloth 3 and the mounting portion 21 to protrude outside the bag 1. This mounting part 2
Reference numeral 1 is used for fixing to an external fixing member (not shown). Thus, the side airbag device 100 is assembled. The side airbag device 100 is used to protect an occupant from an impact acting upon a side collision of a vehicle.

In the side airbag device 100, the bag 1 is folded into a predetermined shape and stored at a predetermined position of the vehicle. When a side collision of the vehicle or the like is detected by a sensor (not shown), an ignition signal is sent to the inflator 2 by ignition control means (not shown). In the inflator 2, a squib (not shown) is ignited based on the ignition signal to generate gas. Then, this gas is supplied into the bag 1, and the folded bag 1 is inflated and deployed, and the bag 1 functions as a cushioning material for the occupant, and protects the occupant from an external impact.

When the bag 1 is deployed, the gas inflates the bag 1 and leaks to the outside through the slit 12 provided near the return line 13.
Since the closed portion 32 covers the slit 12 from the outside, the gas can be prevented from leaking satisfactorily. Even if the bag 1 is damaged by the heat of the gas, the gas leakage can be satisfactorily prevented by the closing portion 32 of the closing cloth 3 which is arranged closely to the outside. Also, by attaching the mounting portion 21 of the inflator 2 protruding to the outside of the bag 1 to an external fixing member, the bag 1 and the closing cloth 3 are sandwiched between the inflator 2 and the fixing member. The force when the bag 1 is about to be inflated is kept satisfactorily by the gas. At this time, since the closing cloth 3 covers the side surface of the inflator 2, when the bag 1 is deployed,
The reaction received from the inflator 2 can be received with sufficient strength, and also functions as a reinforcing member. In particular, the bag 1 has low mechanical strength near the slit 12,
By covering the slit 12 from both the inner and outer surfaces, sufficient mechanical strength near the slit 12 can be obtained. Further, since the closing cloth 3 can be fixed only by inserting the mounting portion 21 of the inflator 2 into the mounting hole 33 provided in the closing cloth 3, the assembling of the closing cloth 3 is easy. Also, since the gas leakage prevention structure and the fixing structure of the bag 1 are simple,
The number of parts is reduced, and the cost of the side airbag device 100 can be reduced.

In the above embodiment, the slit 12 is provided for disposing the inflator 2 in the bag 1, but a configuration in which a hole, a notch, a window, and the like are provided may be employed. In addition, the smaller the opening area, the better the gas leakage can be prevented.
Further, in the above-described embodiment, the closing cloth 3 is provided with the function as the reinforcing cloth, but may not be provided with the function as the reinforcing cloth. That is, in the above-described embodiment, the slit 12 is provided in the folding line 13 of the bag 1, but the slit 12 is provided in a portion other than the folding line 13, and the slit 12 is covered with the closing cloth 3 from both the inner and outer surfaces. Is also good. Alternatively, a reinforcing cloth different from the closing cloth, which reinforces the mechanical strength or heat resistance against gas around the inflator mounting portion of the bag, may be fixed to the inside or outside of the bag by sewing.

In the above embodiment, the reinforcing portions 3 of the closing cloth 3
1 is fixed by a substantially U-shaped closing cloth stitching portion 16, but at this point, at least one end of the closing portion 32 of the closing cloth 3 is stitched to the outside of the base cloth 11 without sewing. Conceivable. According to this method, the operability during the assembling work may be slightly inferior, but in other respects, the same effect as that of the above-described embodiment can be obtained.

Alternatively, the closing cloth 3 does not have to penetrate the slit 12, and at least one end thereof is formed by the base cloth 1.
It suffices if it is sewn to the outside or inside of one. Also in this case, if the closing cloth 3 covers the slit 12 from the outside or the inside, the same effect as in the above embodiment can be obtained. For example, as one example, the side airbag device 20 in which one end of the closing cloth 3 is sewn to the inside of the base cloth 11.
0 is shown in FIG. Also in this case, since the closing cloth 3 covers the slit 12 from the inside, the same effect as in the above-described embodiment can be obtained.

In the above embodiment, the side airbag device for protecting the occupant in the event of a side collision has been described. However, the present invention can be applied to other airbag devices for protecting the occupant such as the passenger airbag device. .

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a configuration and a manufacturing procedure of a bag of a side airbag device 100 according to the present invention.

FIG. 2 is a perspective view schematically showing a procedure for disposing an inflator in a bag of the side airbag device 100 according to the present invention.

FIG. 3 is a perspective view schematically showing a procedure of disposing an inflator in a bag of the side airbag device 200 according to the present invention.

FIG. 4 is a perspective view showing a configuration of a conventional side airbag device 101.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag 11 ... Base cloth 12 ... Slit-shaped insertion hole (slit) 13 ... Folding line 14 ... Outer peripheral part 15, 33 ... Mounting hole 16 ... Closing cloth stitching part 2 ... Inflator 21 ... Mounting part 3 ... Closing cloth 31 ... Reinforcing part 32 ... closing part 100, 200 ... side airbag device according to the present invention

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Moto Nakagawa 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. DENSO Corporation

Claims (6)

[Claims] 1. A bag formed in a bag shape and provided with an insertion hole, an inflator arranged in the bag through the insertion hole, and generating a gas based on an ignition signal, An airbag device, comprising: a closing cloth that covers the bag from the outside or the inside, or from both the outside and the inside of the bag by penetrating the insertion hole. 2. The airbag device according to claim 1, wherein at least one end of the closing cloth is fixed to the outside or inside of the bag by sewing. 3. The air according to claim 1, wherein the closing cloth reinforces mechanical strength around the mounting portion of the inflator on the bag or heat resistance against the gas. Bag device. 4. The airbag device according to claim 1, wherein the insertion hole is provided in a slit shape. 5. The bag is formed in a bag shape by folding and suturing one base fabric at substantially the center, and the slit-shaped insertion hole is formed with a folding line substantially at the center of the base fabric. The airbag device according to claim 4, wherein the airbag device is formed so as to obliquely cross each other at substantially the center of the airbag. 6. The airbag device according to claim 5, wherein the slit-shaped insertion hole is formed so as to obliquely intersect with the folding line at an intersection angle of about 60 degrees.