JPH0880799A - Air bag device - Google Patents

Abstract

PURPOSE: To prevent the danger of a fire at the time of manufacture, start an air bag quickly, surely, and safely, and reduce the cost by providing a sealed container of the compressed gas mainly constituted of oxygen and a sealed container of the compressed gas mainly constituted of the combustion gas for inflating the air bag. CONSTITUTION: Cylinder fitting holes 2a, 2b having the center lines X, Y of axial holes crossing in a cover 8 at an angle are bored on an air bag main body 1, and an air bag 10 is fitted on one side. Compressed gas sealed containers 6a, 6b formed with notches 6c, 6d at the neck portions are screwed into the cylinder fitting holes 2a, 2b while the neck of an opening end section is arranged in the cover 8, oxygen 7a is filled in the container 6a, combustion gas 7b is filled in the container 6b, and both containers 6a, 6b are sealed by plug bodies 6e, 6f. When an impact caused by an emergency disaster such as a collision is detected, a detonating device 4 is detonated, and the plug bodies 6e, 6f are sprung off. Such danger is prevented that a fire breaks out or a noxious constituent is generated during the manufacturing process, a high inflating speed and high reliability and safety are obtained, and the cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device which is mounted on a steering wheel or a front surface of a seat of an automobile or the like and is operated in an emergency disaster such as a collision accident to protect an occupant. The purpose is to eliminate the risk of fire and to start quickly, reliably, safety, and reduce costs.

[0002]

2. Description of the Related Art As a method of inflating an airbag,
A method of sensing the impact of a collision, electrically capturing the impact, and utilizing the explosive force of the explosive by an electric heater to gasify the gas generating agent by a chemical reaction (Japanese Patent Laid-Open No. 50-14703).
In addition to No. 2), a method is known in which the gas pressure of the gas cylinder is used, and a gas is ejected by piercing the sealing plate of the gas cylinder with a sharpened arrow to detect gas impact and ejecting the gas into the airbag. There is.

[0003]

However, in the case of using explosives, there is a danger of heat generation due to a chemical reaction and a large explosion sound, and in the case of using gas cylinders, the one using azica sodium is the mainstream. Therefore, there is a risk of causing a fire mainly due to decomposition or combustion in the manufacturing process, especially when mixed with an oxidizer or during granulation of the preparation, and also decomposes to cause Na2O or its derivatives (NaOH, etc.) There is also a handling hazard as it produces toxic components.

[0004]

Therefore, in the present invention, various problems in the above-mentioned prior art are solved, and in particular, the danger of fire occurrence and the danger of handling in the manufacturing process are eliminated. Specifically, an airbag body provided with a foldable bag, a compressed gas sealed container for inflating the bag, which is attached so as to face the sealed opening edge, and the compressed body And a means for opening and igniting the gas sealed container, wherein the compressed gas sealed container comprises two containers, a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. Relates to an airbag device.

Further, in the present invention, at least one of ethane, methane, propane, hydrogen and acetylene is used as a main component as a combustion gas filled in a compressed gas hermetic container having a combustion gas as a main component. However, it also relates to the airbag device.

The present invention further includes an airbag body having a foldable bag, and a compressed gas hermetic container for inflating the bag, which is attached so as to face the sealed opening edge. And a means for opening and igniting the compressed gas sealed container, wherein the compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. In addition, the present invention also relates to an airbag device characterized in that the openings of the two compressed gas hermetically sealed containers are made to face the inside of the airbag having a cover having a ventilation hole.

The present invention further includes an airbag body having a foldable bag, and a compressed gas hermetic container for inflating the bag, which is attached so as to face a sealed opening edge. And a means for opening and igniting the compressed gas sealed container, wherein the compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. In addition, the present invention also relates to an airbag device characterized in that the axial lines of the two compressed gas sealed containers are intersected with each other.

The present invention further includes an airbag body having a foldable bag, and a compressed gas hermetic container for inflating the bag, which is attached so as to face the sealed opening edge. And a means for opening and igniting the compressed gas sealed container, wherein the compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. At the same time, the openings of the two compressed gas hermetically sealed containers are made to face the inside of the airbag having a vent hole, and the openings of the two compressed gas hermetically sealed containers are provided in the cover. The present invention also relates to an airbag device characterized in that one or two or more partition members having a large number of vent holes are interposed between them.

Further, the present invention also relates to an airbag device which is operated by the detonation energy of the detonator which is operated by an electric signal from an impact sensor, as a means for opening and igniting the compressed gas sealed container.

Further, the present invention further comprises an airbag body having a foldable bag, and a compressed gas hermetic container for inflating the bag, which is attached so as to face the sealed opening edge. And a means for opening and igniting the compressed gas sealed container, wherein the compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. In addition, the axes of the two compressed gas sealed containers in the opening direction are made to intersect each other in the cover having the vent hole formed inside the airbag, and a cut is made in the neck of each compressed gas sealed container. At the same time, a piston that closes the opening of the detonator as a means for opening and igniting the compressed gas sealed container faces the inside of the cut groove. Also it relates to an air bag device that.

[0011]

When the sensor detects a shock caused by a vehicle collision and the detonator is activated by electric energy, the compressed gas sealed container containing oxygen as a main component and the compressed gas sealed container containing combustion gas as a main component are separated. The sealed openings of the two containers are opened instantaneously, and at the same time, a compressed gas containing oxygen as a main component and a compressed gas containing combustion gas as a main component are jetted and mixed from both the containers, and the above-mentioned is added thereto. It is ignited and burned by the high heat generated by the explosion of the detonator, and produces a gas of at least several tens of times that of high temperature H2O or CO2 + H2O to inflate the airbag.

Further, when the openings of the two compressed gas sealed containers are made to face the inside of the air bag, which has a vent hole, the ejected gas is sufficiently discharged in the cover. In addition to being agitated, the opening of the compressed gas hermetically-sealed container hits the inner surface of the cover to prevent damage to the airbag.

Further, when the opening direction axis lines of the two compressed gas sealed containers are made to intersect with each other, the two kinds of jetted compressed gases are immediately stirred to further enhance the stirring efficiency.

Further, the openings of the two compressed gas hermetically sealed containers are made to face the inside of the air bag which has a vent hole, and the two compressed gas hermetically sealed containers have the openings therein. In the case where one or more partition walls having a large number of ventilation holes are interposed between the openings, the two kinds of ejected gas pass through the numerous ventilation holes of the partition material. The stirring efficiency is more perfect because they are stirred together during the operation.

[0015]

The specific contents of the present invention will be described below with reference to FIGS.
2 will be described based on the embodiment, 1 is an airbag body,
4 is a detonator attached to the cylinder 3 of the airbag body 1 which bulges out in the center, and 5 is connected to the detonator 4.
Moreover, the pistons 6a and 6b attached so as to close the opening of the detonator 4 are compressed gas sealed containers,
8 is a cover, 10 is a foldable airbag, and 11 and 12 are partition walls.

The air bag body 1 has two cylinder mounting holes 2a. 2b is opened at an angle where the center lines X and Y of the shaft holes intersect inside the cover 8, and the cover 10 is attached to one side thereof.
Cylinder mounting hole 2a. 2b has
Notch on neck 6c. Compressed gas hermetically sealed containers 6a and 6b, respectively, are screwed into the cover 8 with their open end necks facing the inside of the cover 8, and the compressed gas hermetically sealed containers 6a. Inside 6b, oxygen (eg 7a) is provided on one side and combustion gas (eg 7b) is provided on the other side.
Fill each and fill the openings with plugs 6e. Seal with 6f.

Regarding the above combustion gas, for example, ethane (C2H6), methane (CH4), propane (C3)
A compressed gas containing at least one of H8), hydrogen (H), and acetylene as a main component. In this case, the chemical reaction formula when methane (CH4) is used is CH4 (methane) + 2O2 (oxygen) → CO2 (carbon dioxide) + 2H2O (water), and the required ratio of methane gas and oxygen is 1 to 2. Become.

When hydrogen (H) is used, the chemical reaction formula is 2H2 (hydrogen) + O2 (oxygen) → H2O (water), and the required ratio of hydrogen gas and oxygen is 2: 1.
The required ratio of the combustion gas and oxygen may differ depending on the type of the combustion gas used in this way. In such a case, however, the gas filling pressure may be increased or decreased as a means for adjusting the gas amount for convenience. When methane (CH4) is used, oxygen is 100 kg / square centimeter with respect to methane gas of 50 kg / square centimeter, and when hydrogen (H) is used, oxygen is 50 kg / square centimeter with respect to hydrogen 100 kg / square centimeter.

By making the filling pressure difference in this way, it is possible to control the tentative balance of the two, but even in this case, it is unavoidable that the release ratio of the two becomes slightly unstable. Therefore, in order to further improve the required ratio of combustion gas and oxygen and the mixing accuracy, and to stabilize the discharge ratio of both, the size of the compressed gas container and the gas pressure are made equal and supplemented as a shortage. By filling the inner container with an inert gas such as helium or argon, the two can be completely combusted according to the above-described chemical reaction formula to improve the gas generation efficiency.

The inert gas such as helium or argon filled as a shortage as described above is heated by the combustion gas to expand its volume up to about 10 times, which causes a synergistic effect when the airbag is inflated. It is possible to exert the physical action effect.

Further, the detonator 4 is electrically connected to an impact sensor (not shown) so that the detonator 4 is electrically detonated at the same time when the impact is sensed due to an emergency disaster such as a vehicle collision.
The piston 5 is loosely fitted in the cylinder 3 and is configured to project into the cover 11 of the airbag body 1 when the detonator 4 detonates.
Of the notch 6c. In the compressed gas sealed containers 6a and 6b. 6d to engage with the opening plug 6e. The tip portion including 6f can be instantly bounced off.

Further, the cover 8 has a through hole 9 in its peripheral portion.
Are formed at equal intervals, are attached by screwing to the outer peripheral portion of the airbag body 1, and outwardly extending flanges 8a are formed on the outer peripheral edges thereof, and the flange 8a is foldable as described above. The airbag 10 is attached. Further, the partition materials 11 and 12
Has a large number of vent holes 11a and 12a over the entire surface.
A pair of compressed gas sealed containers 6a. 6b so as to surround each opening, and between the partition members 11 and 12, and the partition member 12
And a peripheral wall of the cover 8 are mounted in a circular shape so that a fixed interval is interposed therebetween. In this case, the partition wall material may have only one of the partition wall materials 11 and 12.

With the above-mentioned structure, when the shock caused by the collision of the vehicle is sensed, the detonator 4 electrically detonates, whereby the piston 5 in the cylinder 3 projects into the body cover 8 of the airbag, At that time, a pair of compressed gas sealed containers 6a. Each notch 6c. 6d is pushed up strongly to make the stopper 6e. The neck portion to which 6f is applied is instantly bounced and opened completely, and oxygen inside one compressed gas sealed container and the combustion gas inside the other compressed gas sealed container are simultaneously ejected to mix both. , Detonator 4
Due to the high heat generated, the mixed gas is ignited and burned to generate a reaction gas having a volume of several tens of times higher than that of H2O or CO2 + H2O at high temperature, and the reaction gas is blown out from the through hole 9 of the cover 8 to generate air. Inflate the bag 10.

Although the compressed open end of the compressed gas sealed container is blown off by the pressing force of the internal pressure gas, it is protected by the cover 8 and does not adversely affect the airbag 10 itself. Further, in this case, the partition material 11 and / or the partition material 12 is provided in the cover 8.
In the case of including the above, when the ejected oxygen and the combustion gas pass through these many through holes, they can be more completely agitated to increase the combustion efficiency, and thus the gas generation amount. It is possible to make the compressed gas sealed container smaller or to reduce the content gas amount.

In the above embodiment, the pair of compressed gas sealed containers 6a. As a means for removing the opening of 6b, one cylinder 3 that closes the opening of the detonator 4 is used, and a piston 5 that slides in the cylinder 3 is used. Compressed gas sealed container 6a. A number of cylinders and pistons corresponding to the number of 6b may be provided.

[0026]

As described above, according to the present invention, a compressed gas for inflating a bag, which is attached so as to face an air bag body having a foldable bag and a sealed opening edge, is provided. It comprises a hermetically sealed container and a means for opening and igniting the hermetically sealed compressed gas container. The hermetically sealed compressed gas container comprises a hermetically sealed container of compressed gas containing oxygen as a main component and a hermetically sealed container of compressed gas mainly containing combustion gas. Therefore, there is no danger of fire caused by decomposition or combustion mainly in the manufacturing process, especially when mixing with an oxidant or during granulation of the preparation as in the past.
Alternatively, there is no danger of producing a toxic component such as its derivative (NaOH, etc.), so there is no danger in handling.

In addition, two compressed gas sealed containers, a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component, are formed inside the airbag. When exposed to the inside of a cover having a vent hole, the mixing of oxygen and combustion gas becomes good,
Further, even when the opening of the sealed container is bounced off, it does not directly contact the inner surface of the airbag, so that the airbag is not damaged.

Further, in the case where two compressed gas sealed containers of a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component are made to intersect with each other in the opening direction axis line, The mixing efficiency of the jetted oxygen and combustion gas becomes extremely good, and the functionality of the airbag can be further enhanced.

Further, in the case where one or more partition walls having a large number of vent holes are interposed between the cover of the airbag body and the openings of the two compressed gas sealed containers, The mixing efficiency of the oxygen and the combustion gas described above is further improved, and the reliability of the airbag can be further improved.

As means for opening the opening of the compressed gas sealed container, a notch is made in the neck of each compressed gas sealed container, and the tip corner of the piston is exposed in the cut groove to further detonate the detonator. Since the above-mentioned piston is made to rush toward the cover direction,
Compared to the conventional method that simply pierces the sealing plate of a gas cylinder with a sharpened arrow to sense gas and ejects the gas into the airbag, the force required to open the cylinder The size of the gas cylinder is small, and the opening area of the gas cylinder opening is significantly large. As a result, it has excellent instantaneous gas generation capacity, faster inflation speed of the airbag, extremely high reliability, and safety and cost reduction. There is a big contribution.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a state where the airbag device of FIG. 1 is activated and inflated.

[Explanation of symbols]

 1 Airbag Main Body 2 Cylinder Mounting Hole 3 Cylinder 4 Detonator 5 Piston 6a Compressed Gas Sealed Container 6b Compressed Gas Sealed Container 6c Cut 6d Cut 6e Plug 6f Plug 7 Compressed Gas 8 Cover 9 Through Hole 10 Airbag 11 Partition Material 12 Partition material

Claims (7)

[Claims] 1. An airbag body having a foldable bag, a compressed gas hermetic container for inflating the bag, which is attached so as to face a sealed opening edge, and the compressed gas. And a means for opening and igniting the hermetically sealed container, wherein the hermetically sealed compressed gas container comprises two containers, a hermetically sealed container of compressed gas containing oxygen as a main component and a hermetically sealed container of compressed gas mainly containing combustion gas. Characteristic airbag device. 2. A claim in which a compressed gas containing a combustion gas as a main component and filled in a compressed gas sealed container contains at least one of ethane, methane, propane, hydrogen and acetylene as a main component. The airbag device according to Item 1. 3. An airbag body provided with a foldable bag, a compressed gas hermetic container for inflating the bag, which is attached so as to face a sealed opening edge, and the compressed gas. The compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. An airbag device, characterized in that the openings of these two compressed gas sealed containers are made to face a cover having a ventilation hole, which is formed inside the airbag. 4. An air bag body having a foldable bag, a compressed gas sealed container for inflating the bag, which is attached so as to face a sealed opening edge portion, and the compressed gas. The compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. An air bag device characterized in that the opening direction axes of these two compressed gas sealed containers are intersected. 5. An airbag body having a foldable bag, a compressed gas hermetic container for inflating the bag, which is attached so as to face a sealed opening edge, and the compressed gas. The compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. The openings of the two compressed gas hermetically sealed containers are made to face the inside of the air bag, which has a vent hole, and the openings of the two compressed gas hermetically sealed containers are formed in the cover. An air bag device, characterized in that one or more partition walls having a large number of ventilation holes are interposed therebetween. 6. The airbag device according to claim 1, wherein the means for opening and igniting the compressed gas hermetically sealed container is adapted to be actuated by the detonation energy of an detonator actuated by an electric signal from an impact sensor. 7. An airbag main body having a foldable bag, a compressed gas hermetic container for inflating the bag, which is attached so as to face a sealed opening edge, and the compressed gas. The compressed gas sealed container comprises a compressed gas sealed container containing oxygen as a main component and a compressed gas sealed container containing combustion gas as a main component. The opening axis lines of the two compressed gas sealed containers are intersected in a cover having a vent hole formed inside the airbag, and a cut is made in the neck of each compressed gas sealed container. An air bag characterized in that a piston that closes the opening of the detonator as a means for opening and igniting the compressed gas hermetic container is exposed in the cut groove. Location.