JPH11157410A - Air bag system for side impact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of a sewn part of a tether to restrict expansion of the body of an air bag in the width direction by a gas pressure without using a separately provided cloth, etc. SOLUTION: An air bag system for side impact is configured so that the body 4 of air bag formed in a sack shape is accommodated together with an inflator 6 in a case which is embedded in the side face of a seat back, wherein a tether 7 to restrict inflation of the air bag body 4 in the width direction is installed inside the air bag body 4, and between the tether 7 positioned ahead of the inflator 6 and the inflator 6 a flameproof cloth 9 is provided to prevent the high temp. gas spouted from the inflator 6 from blowing to the tether 7 directly or to the sewn part of the tether 7 with the air bag body 4. According to this configuration, there is no risk that the tether 7 and/or its sewn part are broken by the heat, so that the air bag body 4 can be inflated into the specified shape momentarily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side collision airbag device for protecting an occupant from a side collision of a vehicle.

[0002]

2. Description of the Related Art Conventionally, as this type of side collision airbag device, for example, a device described in Japanese Patent Application Laid-Open No. 9-220994 is known.

The side collision airbag device disclosed in the above publication is provided with an airbag case containing an airbag bag on a side portion of a seat back frame. When the side airbag device operates at the time of a side collision, the airbag device inflates. Since the lid of the airbag case is deployed by being pressed by the airbag bag body and the seat pad located in front of the lid is compressed inward by the lid at this time, the deployment trajectory of the airbag is expanded, so that the airbag is expanded. This has the effect of shortening the time required to complete deployment of the bag and stabilizing the deployed shape.

Another side collision airbag device is as follows.
For example, JP-A-6-72267 and JP-A-9-39
No. 710 is known.

[0005] In the structure disclosed in Japanese Patent Application Laid-Open No. 6-72267, the front-side base cloth greatly inflates toward the occupant between the front-side base cloth and the rear-side base cloth of the airbag body. The suspension belt is provided with a length that is greater than the width of the airbag body when it is inflated, and the middle portion of the long belt portion is pinched and sewn. Since the wearing work can be easily performed, the workability is improved.

On the other hand, in the above-mentioned Japanese Patent Application Laid-Open No. 9-39710, a main bag portion and a sub-bag portion are provided in one bag body. Protect and inflate and deploy the sub-bag using the action of the main bag being crushed by the chest,
Since the head of the occupant is protected, the head of the occupant can be protected with a gas amount enough to inflate and deploy the main bag portion, and thus there is an effect that a small inflator can be employed.

[0007]

In any of the above-mentioned conventional side airbag devices, when an impact due to a side collision is sensed, the inflator instantaneously generates a large amount of gas, inflates the airbag body, and causes the occupant to inflate. Is protected from the impact of a side collision.

However, in recent years, a combustion type inflator in which the gas generating ability is less likely to decrease even after a long period of time has been adopted.

In this combustion type inflator, heat is also generated at the time of gas generation, so that the gas generated from the inflator is directly sent into the airbag main body and the airbag main body is moved to the airbag main body as in the above-mentioned conventional side collision airbag. In the case of inflating and deploying, there is a problem that the airbag base fabric near the inflator is damaged by heat.

Particularly, in a side collision airbag device provided with a tether (suspension belt) for restricting inflation in the width direction of the airbag body in front of the inflator, high-temperature gas is directly applied to a sewing portion between the airbag body and the tether. Therefore, the sewn portion is damaged by the heat damage, and the inflation of the airbag body in the width direction cannot be restricted.

In order to prevent this, conventionally, measures have been taken to reinforce the airbag body and the tether by applying another cloth to the sewn portion. However, this method increases the number of parts. In addition, since sewing is troublesome, there are problems such as an increase in cost.

The present invention has been made to solve such a conventional problem. By providing a flameproof cloth in front of the inflator, it is possible to prevent high-temperature gas from directly hitting the seam of the airbag body and the tether. It is an object of the present invention to provide a side collision airbag device for preventing a sewn portion of a tether from being damaged by a high-temperature gas without using a separate cloth or the like.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a method in which high-temperature gas ejected from an inflator is directly provided between a tether provided in front of an inflator and an inflator, or between a tether and an airbag body. The airbag body is provided with a flameproof cloth that prevents it from hitting the seam of the airbag.The tether and the seam of the airbag body are not damaged by heat damage. It will be able to expand and deploy.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an airbag for side collision in which an airbag body formed in a bag shape is housed together with an inflator in an airbag case buried in a side surface of a seat back. In the device, in the airbag body, a tether that regulates the inflation of the airbag body in the width direction is provided, and between the tether and the inflator provided in front of the inflator, high-temperature gas ejected from the inflator is provided. It is provided with a flameproof cloth which prevents the tether or the tether and the airbag body from being directly sewn.

According to the above configuration, even if the high-temperature gas generated from the inflator by the impact of the side collision is jetted toward the tether, the flameproof cloth receives the high-temperature gas and sews the tether or the tether and the airbag body. The tether and the sewn portion between the tether and the airbag main body are not damaged by heat damage because it is prevented from directly hitting the portion.

According to a second aspect of the present invention, the width and the length of the flameproof cloth are made larger than the width and the length of the tether, and both ends are sewn to the airbag body near the inflator. .

According to the above configuration, the flameproof cloth expands and absorbs the gas pressure, so that a large tensile force does not act on the sewing portion of the tether, and the high-temperature gas directly hits the tether. Can be prevented.

According to a third aspect of the present invention, the width and length of the flameproof cloth are formed to be larger than the width and length of the tether, and both ends of the tether are sewn to the airbag body. Is sewn to the airbag body together with both ends of the flameproof cloth.

According to the above configuration, the hot gas can be prevented from directly hitting the tether, and the tether and the flameproof cloth can be simultaneously sewn.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a seat provided with a side collision airbag device, FIG. 2 is a cross-sectional view taken along line AA of FIG.
3 is an exploded view of the airbag main body, FIG. 4 is a perspective view of the vicinity of the flameproof cloth, and FIGS. 5 to 7 are operation explanatory diagrams at the time of a side collision.

In FIG. 1, reference numeral 1 denotes a vehicle seat, in which an airbag body 4 constituting a side collision airbag device is accommodated in a resin airbag case 5 on an upper side surface of a seat bag 2 on a door side. Buried in

The airbag case 5 has a lid 5a which is closed during normal times, and is pressed and opened by the airbag body 4 when the airbag body 4 is inflated and deployed. When a side collision is detected, a combustion type inflator 6 that generates a large amount of gas instantaneously and the folded airbag body 4 are housed.

As shown in FIG. 3, the main body 4 of the airbag body 4 protects the occupant's chest during a side collision.
_1, in the structure that integrates the sub-bag unit 4 ₂ to protect the occupant's head, top fabric 4a to inflated and deployed into a predetermined shape by the generated gas from the inflator 6 and the back skin fabric 4b
Is formed into a bag shape by sewing around.

[0025] Then with the inflator 6 is attached to the airbag case 4 so as to be located in the main bag portion 4 _1, and the main bag portion 4 _1, the boundary of the sub-bag unit 4 _2, partition wall 4c is be formed, this partition wall 4c, and is communicating hole 4d is formed communicating between the main bag portion 4 ₁ and the sub bag section 4 _2.

[0026] The communication hole 4d, by gas generated from the inflator 6 to regulate the flow into the sub bag section 4 _2, first the main bag portion 4 ₁ is inflated and deployed, then the sub-bag unit 4 ₂ is expanded and deployed, and is formed by an orifice.

[0027] The other hand the air bag body 4, is inflated and deployed is instantaneously along the gap between the armrest 3 and inflated and deployed when the main bag portion 4 ₁ and the sub bag portion 4 ₂ door (not shown) As described above, a plurality of tethers 7 for restricting the widthwise expansion of the airbag body 4 are provided in front of the inflator 6.

As shown in FIG. 4, the tether 7 is formed in a band shape with a base cloth made of the same material as that of the airbag body 4, and both ends of the tether 7 are sewn with sewing threads 8.
a and the inner skin of the backing cloth 4b.

Further, the tether 7 provided in front of the inflator 6 is directly hit by the high-temperature gas ejected from the inflator 6, and the tether 7 and the sewing thread 8 are damaged by heat. A flameproof cloth 9 is provided between them.

The flameproof cloth 7 is made of the same material as the tether 7 or
The base fabric having heat resistance, wider than tether 7, and be formed in a long strip lengths, both ends main bag portion 4 ₁ of top fabric 4a in the vicinity of the inflator 6
Sewn on the inner side of the backing cloth 4b with a sewing thread 10.

The middle portion is extended to the tether 7 in a state of being bent substantially in a U-shape, and the middle portion is sewn to the front surface of the tether 7 with a sewing thread 11 so that the hot gas blown out by the inflator 6 is removed. The flameproof cloth 9 is directly received so as not to directly hit the tether 7 or the sewing thread 8 sewn both ends of the tether 7.

Next, the operation of the side collision airbag device constructed as described above will be described.

In normal times, the airbag body 4 is stored in a folded state in an airbag case 5 buried in the upper part of the side surface of the bag sheet 2, and the lid 5a of the airbag case 5 is also shown in FIG. In a closed state.

Next, in this state, when a sensor (not shown) detects an impact at the time of a side collision, a large amount of gas is generated from the inflator 6 and jetted toward the flameproof cloth 11 as shown in FIG. the main bag portion 4 ₁ of the body 4 starts inflation, but flame cloth 9 having received the hot gas ejected from the inflator 6 directly, absorbs the gas pressure by decompressing the generally U-shaped as shown in FIG. 5 Therefore, the high temperature gas does not directly hit the sewn portion of the tether 7 or the tension due to the gas pressure is not directly applied.

[0035] Thus for sewn portion of the tether 7 and heat damage due to high temperature gas, not be damaged by excessive tension, to regulate the expansion of the width direction of the main bag portion 4 _1,
Along with the main bag portion 4 ₁ along the gap between the door and the armrest 3 can be quickly inflated and deployed, even flame cloth 9 is broken by an excessive tensile force caused by the high temperature gas and the gas pressure at this time, the main bag portion 4 there is no affect on the ₁ of the deployed configuration.

On the other hand gas the main bag portion 4 ₁ is inflated and deployed is flows from the communication hole 4d to the sub-bag unit 4 in _2, the expansion is expanded to the sub-bag unit 4 ₂ As shown in FIGS. 6 and 7 .

[0037] This first main bag portion 4 ₁ protects the occupant's chest from an impact of a side collision, followed in order to protect an occupant's head by the sub bag portion 4 _2, an occupant from an impact of a side collision It is possible to reliably protect.

In the above-described embodiment, the middle portion of the flameproof cloth 9 is sewn on the surface of the tether 7 so that the position of the flameproof cloth 9 does not shift with respect to the tether 7. Wearing is not required.

The main bag part 4 of the airbag body 4
₁ and by changing the width and position of the tether 7 located in the vicinity of the partition wall 4c provided between the sub-bag unit 4 _2, inflow and inflow time of the gas flowing into the sub-bag unit 4 within ₂ from the communication hole 4d by adjusting the can be arbitrarily adjusted inflation and deployment time of the sub-bag unit 4 _2.

On the other hand, FIG. 8 shows that both ends of the tether 7 and the flameproof cloth 9 are simultaneously sewn on both ends of the tether 7 and the flameproof cloth 9 by sewing threads 8 sewn to the inner surfaces of the skin cloth 4a and the back cloth 4b of the airbag body 4. 4A and 4B show another embodiment sewn to the backing cloth 4b. In this case as well, the flameproof cloth 9 is larger than the width and the length of the tether 7, so that the hot gas directly hits the tether 7. To prevent it.

[0041]

As described in detail above, according to the present invention, a flameproof cloth which directly receives gas ejected from an inflator is provided between a tether provided in front of the inflator and the inflator. The hot gas generated from the inflator does not directly hit the tether or the seam between the tether and the airbag body.

Further, since the flameproof cloth is formed in a band shape which is wider than the width of the tether and is sufficiently long, the length of the flameproof cloth is longer than the length of the tether with respect to the pressure of the gas ejected from the inflator. The tether and the sewn section are not damaged by heat damage because the tether and the sewn section are not directly affected by the hot gas. Can be reliably prevented.

Further, since it is not necessary to sew another cloth on the sewn portion of the tether, the number of parts can be reduced, and the man-hour required for the sewn operation can be reduced. I can plan.

[Brief description of the drawings]

FIG. 1 is a perspective view of a seat provided with a side collision airbag device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a development view of an airbag body used in the side collision airbag device according to the embodiment of the present invention.

FIG. 4 is a perspective view of the vicinity of a flameproof cloth provided on an airbag body of the side collision airbag device according to the embodiment of the present invention.

FIG. 5 is an operation explanatory view of the side airbag device according to the embodiment of the present invention;

FIG. 6 is an operation explanatory view of the side airbag device according to the embodiment of the present invention;

FIG. 7 is an operation explanatory view of the side collision airbag device according to the embodiment of the present invention.

FIG. 8 is an explanatory view showing another embodiment of the flameproof cloth of the side collision airbag device according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 3 Armrest 4 Airbag main body 4 ₁ Main bag part 4 ₂ Subbag part 4a Skin cloth 4b Back cloth 4c Partition wall 4d Communication hole 5 Airbag case 6 Inflator 7 Tether 8 Sewing thread 9 Flameproof cloth 10 Sewing Thread 11 sewing thread

Claims (3)

[Claims] 1. An airbag device for a side collision in which an airbag body formed in a bag shape is housed together with an inflator in an airbag case embedded in a side surface of a seat back, wherein the airbag body is provided in the airbag body. A tether that restricts the inflator from expanding in the width direction is provided, and between the tether and the inflator provided in front of the inflator, high-temperature gas spouted from the inflator is directly tethered, or a tethered portion between the tether and the airbag body. An airbag device for side collision, comprising a flameproof cloth for preventing the airbag from hitting. 2. The side airbag according to claim 1, wherein the width and length of the flameproof cloth are made larger than the width and length of the tether, and both ends are sewn to the airbag body near the inflator. apparatus. 3. The width and length of the flameproof cloth are made larger than the width and length of the tether, and both ends of the tether are sewn to the airbag body, and both ends of the tether are joined together with both ends of the flameproof cloth. 2. The side collision airbag device according to claim 1, which is sewn to the airbag body.