JP2000335350A - Side air bag device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side air bag for an automobile in which the cost is reduced, and the weight is light while the gas emission function of an air bag body is maintained. SOLUTION: This side air bag device has at least an air bag body 16 which is formed in a bag-shape comprising an outer first base cloth 21 arranged on an occupant side and an outer second base cloth 22 arranged on an in-cabin side wall side, inflatable by the gas discharged from an inflator, and folded in a normal condition. Inner base cloths 23, 24 are arranged on an inner surface of the outer first base cloth 21 and the outer second base cloth 22 therealong, and communication holes 25, 26 are formed in the inner base cloths 23, 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called side collision in which another vehicle collides with the side of the vehicle or an obstacle outside the vehicle such as a telephone pole. The present invention relates to a side airbag device for an automobile that protects an occupant by entering between the occupant and a side wall of a vehicle interior.

[0002]

2. Description of the Related Art As such a conventional side airbag device for an automobile, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. 10-287195. In the side collision airbag disclosed in this publication, the airbag body is normally folded and housed in the seat back, but when the side collision of the vehicle occurs, gas generated from the inflator is introduced. The airbag body is inflated, quickly swells out of the seat back, and is deployed in the space between the occupant and the side wall of the passenger compartment. It is designed to absorb. For this reason, a high-output inflator is necessary for the volume of the airbag body, and an exhaust hole is provided in the head protection part in order to quickly discharge generated gas out of the airbag body after inflation of the airbag body. Is provided. A heat-resistant synthetic resin coating is applied to the inside of the airbag body to improve airtightness.

[0003]

However, the heat-resistant synthetic resin coating applied to the inside of the airbag body not only causes an increase in the cost of the airbag body but also causes an increase in weight.

The present invention has been made in consideration of the conventional problems as described above, and the cost is reduced and the vehicle side airbag device is lightweight while maintaining the gas exhaust function of the airbag body. The purpose is to provide.

[0005]

In order to achieve the above-mentioned object, the present invention according to claim 1 is directed to an outer first side arranged on an occupant side.
An automobile having at least an airbag body formed in a bag shape from a base cloth and an outer second base cloth disposed on a side wall side of a vehicle interior, the airbag body being inflatable by gas ejected from an inflator and always folded. Side airbag device, wherein an inner base fabric is disposed along inner surfaces of the outer first base fabric and the outer second base fabric, and a communication hole is formed in the inner base fabric. Is formed.

According to the first aspect of the present invention, the outer first base cloth and the outer second base cloth are provided with a high-heat gas spouted from the inflator despite the fact that the heat-resistant synthetic resin coating is not applied. By receiving the inner base cloth first, the outer first
The base cloth and the outer second base cloth are not affected. Moreover, since the heat-resistant synthetic resin coating is not applied, the gas can be discharged from the mesh between the outer first base fabric and the outer second base fabric constituting the airbag body. Since the heat resistant synthetic resin coating is not applied, the cost is reduced and the weight is reduced.

According to a second aspect of the present invention, there is provided the side airbag device for an automobile according to the first aspect, wherein the airbag body is provided on a chest protection section having the inflator built therein and a downstream side of the chest protection section. The inner base fabric formed with the formed head protection portion and the communication hole is formed at least in the chest protection portion.

According to the second aspect of the present invention, since the inner base fabric having the communication hole is provided at least in the chest protection part, the exhaustability of the gas ejected from the inflator is improved. The chest protection portion is not abnormally expanded, and the reaction force to the occupant can be reduced.

[0009] The invention of claim 3 is claim 1 or claim 2.
Wherein the portion formed with the communication hole is a portion close to the head protection portion or a portion distant from the inflator.

According to the third aspect of the present invention, the gas which has just been ejected from the inflator has a high temperature, but gradually falls as it separates, so that the communication hole is provided at a position after the chest protection portion is sufficiently inflated. Thus, the temperature of the gas to be exhausted can be set to a preferable temperature while maintaining the expansion function of the chest protection portion.

[0011] The invention of claim 4 is the invention of claim 1 or claim 2.
The side airbag device for an automobile according to claim 1, wherein a wall-shaped flameproof member is disposed on the inner surface of the inner base fabric and between the communication hole and the inflator side. I do.

According to the fourth aspect of the present invention, since the high-temperature gas ejected from the inflator is interfered by the wall-shaped flameproof member, the temperature of the gas is reduced by the amount that the gas does not directly flow into the communication hole.

According to a fifth aspect of the present invention, there is provided the side airbag device for an automobile according to any one of the first to fourth aspects, wherein the communication hole comprises a plurality of holes.

According to the fifth aspect of the present invention, if the high-temperature gas is exhausted dispersedly from the plurality of holes, the temperature becomes lower than that of the concentrated exhaust, and the danger of generating heat damage on the side wall of the vehicle interior. It can be significantly reduced.

According to a sixth aspect of the present invention, there is provided the side airbag device for an automobile according to any one of the first to fifth aspects, wherein the inner base fabric having the communication hole is formed of the outer second fabric.
It is characterized by being arranged along the base cloth.

According to the sixth aspect of the present invention, since the second outer fabric is disposed on the side wall of the vehicle cabin, the hot air generated by the gas blown from the inflator does not need to be exposed to the occupant. .

[0017]

1 to 5 show an embodiment of the present invention. As shown in FIGS. 1 and 2, a seat 1 comprises a seat back 2 and a seat cushion 3, and The side airbag device 5 is disposed at a position facing the side wall 4 of the vehicle interior.

As shown in FIG. 2, the seat back 2 includes a seat back frame 6 and a main cushion 7 disposed on a front side FR of the seat back frame 6.
A side cushion 8 disposed on a side SD of the seat back frame 6, and a main cushion 7
And skins 9 and 10 that cover the side cushions 8, and a cleave portion 11 formed by sewing the skins 9 and 10 so as to be cleavable.

The side airbag device 5 has a cylindrical holder 13 in which an inflator 12 that can be ignited by a signal from a sensor or the like (not shown) is housed, and an introduction portion 15 at an outlet 14 of the holder 13. The inflator 12 is arranged so as to face and is normally folded.
An airbag body 16 that can be inflated by the gas that has been blown out, and an opening 17 that covers the holder 13 and the airbag body 16 and that can be cleaved by inflation of the airbag body 16 at a position facing the cleavage portion 11. The case 18 is provided.

The holder 13 is provided on the seat back frame 6 with a nut 20 screwed to a stud bolt 19 inserted together with the folded end of the introduction portion 15 of the airbag body 16. At this time, the ejection port 14 of the holder 13 is disposed facing the front side FR.

The airbag body 16 is sewn by a first outer fabric 21 disposed on the occupant side, that is, on the passenger compartment side, and a second outer fabric 22 disposed on the side wall 4 of the passenger compartment. The inflator 12 is formed in a bag shape and can be inflated by gas ejected from the inflator 12 housed therein, and is always folded.

The inner first base cloth 23 and the inner second base cloth 24 are respectively provided on the inner surfaces of the outer first base cloth 21 and the outer second base cloth 22. 2
The inner first fabric is arranged along the inner surface of the base fabric 22.
The base fabric 23 and the inner second base fabric 24 include the inflator 12.
The communication holes 25 and 26 for efficiently discharging more gas are formed. The outer first base cloth 21 and the outer second cloth
The base fabrics 22 are substantially L-shaped with the same shape.
Reference numerals 34 and 35 are formed on the outer first base cloth 21 and the outer second base cloth 22, the inner first base cloth 23 and the inner second base cloth 24, and a second flameproof cloth 31 described later, respectively. This is a mounting hole for the stat bolt 19.

The airbag body 16 includes a chest protector 27 containing the inflator 12 and a chest protector 2.
The inner first base cloth 23 and the inner second base cloth 24 formed with the head protection part 28 disposed downstream of the base 7 and the communication holes 25 and 26 are disposed at least in the chest protection part 27. Be done.

The inner first base fabric 23 and the inner second base fabric 2
The portion formed with the communication holes 25 and 26 in 4,
This is a part close to the head protection part 28 or a part distant from the inflator 12. The communication hole 2
5 and 26 are composed of a plurality of holes (four places in this embodiment), and the diameter of one communication hole 25 and 26 is about 30 mm, but the shape, size and number of the communication holes 25 and 26 are It is set appropriately according to the volume of the airbag body 16 and the performance of the inflator 12.

At each end of the inner surfaces of the outer first base cloth 21 and the outer second base cloth 22, a hanging string 29 is provided. In addition, a wall-shaped “flameproof” is provided between the communication holes 25 and 26 and the insertion portion 36 of the holder 13 to be described later on the inner surfaces of the inner first base fabric 23 and the inner second base fabric 24. The first flameproof cloth 30 as a “member” is disposed. A second flameproof cloth 31 is disposed on the inner surface of the inner second base cloth 24. One surface of the first flameproof cloth 30 and the second flameproof cloth 31 is provided with a heat-resistant synthetic resin, for example, a silicon coat to improve heat resistance. Woven cloth may be used. The outer first base fabric 21 and the outer second base fabric 22 are non-coated woven fabrics that are not coated.

A partition wall 32 is disposed near the middle of the inner surfaces of the outer first base cloth 21 and the outer second base cloth 22 of the airbag body 16, and a chest protection section is provided below the partition 32. A head protection part 28 is formed on the upper part of the partition wall 32 and separates the protection parts 27 and 28. The partition wall 32 is formed with one or more communication holes 33 that communicate the chest protection part 27 and the head protection part 28. The partition wall 32 may be a heat-resistant synthetic resin, for example, one provided with a silicon coat or a non-coated woven cloth not coated.

The communication holes 25 and 26 are formed in the inner first base cloth 2.
3 and the inner second base cloth 24,
What is formed only in the base cloth 24 may be used. Further, the total area of the communication holes 26 may be provided to be larger than the communication holes 25 formed in the inner first base fabric 23.

Next, a method of manufacturing the airbag body 16 will be described. First, the mounting holes 34 for the stud bolts 19 are formed in the cut outer first base cloth 21. next,
An attachment hole 34 for the stud bolt 19 is formed in the inner first base cloth 23 cut into the same shape as the chest protection part 27 of the outer first base cloth 21. The inner first base cloth 2 is provided on the base cloth surface of the outer first base cloth 21 which becomes the inside when the airbag body 16 is completed.
3 are arranged in an overlapping manner, and sewing H1 is performed at the end of the holder 13 on the insertion portion 36 side when the sewing of the airbag body 16 is completed.

Similarly, the cut outer second base fabric 22
Then, a mounting hole 35 for the stud bolt 19 is formed.
Next, a mounting hole 35 for the stud bolt 19 is formed in the inner second base cloth 24 cut into the same shape as the chest protection portion 27 of the outer second base cloth 22. When the airbag body 16 is completed, the inner second fabric 22 is attached to the inner fabric surface of the outer second fabric 22.
The sewing machine is laid on the base fabric 24 and the second flameproof fabric 31 so as to be overlapped, and the sewing is performed at the end of the holder 13 on the insertion portion 36 side when the sewing of the airbag body 16 is completed.

The inside of the outer first base cloth 21 and the outer second base cloth 22 thus formed is overlapped with each other to form the partition wall 32.
Is arranged between the chest protection part 27 and the head protection part 28,
The partition 32 is sewn to the outer first base cloth 21 and the outer second base cloth 22 by sewing H2 and H3.

The outer first base cloth 21 and the outer second base cloth 2
2 and a first flameproof cloth 30 for protecting the hanging string 29 from the high-temperature gas from the inflator 12.
Sewing H4, H5, H6 is performed on the inside of the base cloth 22. Finally, the edges of the outer first base cloth 21 and the outer second base cloth 22 are sewn H7.

The outer first base cloth 21 and the outer second base cloth 2
2, inner first base cloth 23 and inner second base cloth 24, hanging string 2
9. The first flameproof cloth 30 and the partition wall 32 are made of nylon 66
A 20 denier, non-coated woven fabric having a basis weight of 210 g / m ² is used. The air permeability by the Frazier method is 0.7 cc / cm ² / sec. Also, the inner first base cloth 2
3 and inner second base cloth 24, hanging string 29, first flameproof cloth 30
Is not limited to the above-mentioned coating, and a material obtained by applying a layer of rubber, synthetic resin, or the like to a woven fabric and performing air-impermeable processing may be used.

As described above, since the embodiment of the present invention is constituted, the inflator 12 is ignited by a certain signal such as a collision of an automobile, and gas is jetted from the jet port 14 of the holder 13. By the ejection of the gas,
When the airbag body 16 is inflated and deformed in a direction to open the front side FR of the case 18, the opening 17 of the case 18 is opened, and the airbag body 16 is further inflated. With the expansion force,
Stress concentrates on the cleavage portion 11 of the seat back 2. Thus, the cleavage portion 11 is torn, and the airbag body 16 swells outward as shown in FIG.

The airbag body 16 has a structure in which the outer first base cloth 21 and the outer second base cloth 22 are not coated with a heat-resistant synthetic resin.
The inner first base cloth 23 and the inner second base cloth 24 first receive high-temperature gas that is jetted out, so that the outer first base cloth 21
And the outer second base cloth 22 is not affected. Moreover, since the outer first base cloth 21 and the outer second base cloth 22 are not coated with a heat-resistant synthetic resin, the airbag body 1
Since the gas can be discharged from the mesh between the outer first base cloth 21 and the outer second base cloth 22 that constitutes No. 6, the cost is reduced because the heat resistant synthetic resin coating is not applied while maintaining the gas discharge function. And lightweight.

The inner first base cloth 23 and the inner second base cloth 24 in which the communication holes 25 and 26 are formed are disposed at least in the chest protection part 27, and thus the inner base cloth 23 and the inner base cloth 24 are formed by gas blown from the inflator 12. Abnormal expansion such as an expansion shape close to the above is not performed, so that the exhaust performance is enhanced, and the chest protection portion 27 can reduce the reaction force to the occupant.

The gas that has just been ejected from the inflator 12 has a high temperature.
Since the gas does not directly flow into the communication holes 25 and 26 because of interference with the flameproof cloth 30, the temperature of the gas decreases. Further, as the position of the communication holes 25, 26 gradually decreases as the position of the communication holes 25, 26 moves away from the inflator 12, the temperature of the communication holes 25, 26 decreases.
Since 26 is provided at a position after the chest protector 27 has been sufficiently inflated, the temperature of the gas to be exhausted can be set to a preferable temperature while maintaining the expansion function of the chest protector 27.

If the high-temperature gas is exhausted by dispersing the communication holes 25 and 26 through a plurality of holes, the temperature becomes lower than that of the concentrated exhaust, and the danger of heat damage to the side wall 4 of the vehicle interior is significantly reduced. You can do it.

The present invention is not limited to the above embodiment.
The communication hole 25 may not be formed in the base cloth 23, and the communication hole 26 may be formed only in the inner second base cloth 24.
In this case, the hot air is exhausted only from the outer second base cloth 22 side, so that the hot air due to the gas ejected from the inflator 12 does not need to be exposed to the occupant side.

The head protection portion 28 also has the inner first base cloth 2.
3 and the inner second base cloth 24 are extended, and
May be provided in the vicinity of the top. In this case, since the exhaust position is above the occupant's head position and the side window panel, the risk of heat damage to the vehicle interior side wall 4 can be significantly reduced. Further, the outer first base cloth 21 and the outer second base cloth 22 may not be substantially L-shaped, but may simply protect the chest (torso).

[0040]

According to the first aspect of the present invention, a high-temperature gas blown from an inflator is formed even though the first outer fabric and the second outer fabric are not coated with a heat-resistant synthetic resin. The first outer fabric and the second outer fabric do not affect the first and second outer fabrics. Moreover, since the heat-resistant synthetic resin coating is not applied, the gas can be discharged from the mesh between the outer first base fabric and the outer second base fabric constituting the airbag body. Since the heat resistant synthetic resin coating is not applied, the cost is reduced and the weight is reduced.

According to the second aspect of the present invention, since the inner base fabric having the communication hole is disposed at least in the chest protection part, the exhaustability of the gas ejected from the inflator is improved. The chest protection portion is not abnormally expanded, and the reaction force to the occupant can be reduced.

According to the third aspect of the present invention, the gas which has just blown out of the inflator has a high temperature, but gradually falls as it separates, so that the communication hole is provided at a position after the chest protection portion is sufficiently inflated. Thus, the temperature of the gas to be exhausted can be set to a preferable temperature while maintaining the expansion function of the chest protection portion.

According to the fourth aspect of the present invention, since the high-temperature gas ejected from the inflator is interfered by the wall-shaped flameproof member, the temperature of the gas is reduced by the amount that the gas does not directly flow into the communication hole.

According to the fifth aspect of the present invention, if the high-temperature gas is exhausted in a dispersed manner from the plurality of holes, the temperature becomes lower than that of the concentrated exhaust, and the risk of generating heat damage on the side wall of the vehicle interior is reduced. It can be significantly reduced.

According to the sixth aspect of the present invention, since the second outer fabric is disposed on the side wall of the vehicle cabin, the hot air generated by the gas blown from the inflator does not need to be exposed to the occupant. .

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a seat in a state where an airbag body of an automobile side airbag device according to an embodiment of the present invention is inflated.

FIG. 2 is a cross-sectional view taken along the line SA-SA before the airbag body of the side airbag device for a vehicle in FIG. 1 is inflated.

FIG. 3 is a side view of the airbag body of FIG. 1;

FIG. 4 is a sectional view taken along line SB-SB in FIG. 3;

FIG. 5 is an exploded perspective view of the airbag body of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 seat 4 side wall of vehicle interior 5 side airbag device 9, 10 skin 11 cleavage portion 12 inflator 16 airbag body 21 outer first base fabric 22 outer second base fabric 23 inner first base fabric (inner base fabric) 24 inner first 2 base cloth (inner base cloth) 25, 26 communication hole 27 chest protection part 28 head protection part 29 hanging string 30 first flameproof cloth (flameproof member) 31 second flameproof cloth 32 partition wall

Claims (6)

[Claims] An outer first base cloth disposed on an occupant side;
A side airbag for an automobile having at least an airbag body formed in a bag shape with the outer second base fabric disposed on the side wall side of the vehicle interior, and capable of being inflated by gas ejected from the inflator and always folded. An apparatus, wherein an inner base cloth is arranged along inner surfaces of the outer first base cloth and the outer second base cloth, and a communication hole is formed in the inner base cloth. A side airbag device for an automobile. 2. The side airbag device for an automobile according to claim 1, wherein the airbag body includes a chest protection unit including the inflator and a head protection unit disposed downstream of the chest protection unit. A side airbag device for an automobile, wherein an inner base fabric having a portion formed therein and the communication hole is formed is disposed at least in a chest protection portion. 3. The side airbag device for an automobile according to claim 1, wherein the portion formed with the communication hole is separated from a portion close to the head protection portion or from the inflator. A side airbag device for a vehicle, characterized in that the side airbag device is a bent portion. 4. The side airbag device for a vehicle according to claim 1 or 2, wherein a wall-shaped portion is provided on an inner surface of the inner base fabric and between the communication hole and the inflator side. An automobile side airbag device comprising a flameproof member. 5. The vehicle side airbag device according to claim 1, wherein the communication hole includes a plurality of holes. 6. The side airbag device for an automobile according to claim 1, wherein the inner base fabric having the communication holes is formed along the outer second base fabric. An automotive side airbag device, which is provided.