JPH05155307A - Gas generator for developing air bag - Google Patents

Abstract

PURPOSE:To provide an automatic ignition function under high temperature curcumstances by disposing a sealed container, which contains ignition charge and is formed from celluloid at least a part of it, in gas generating agents. CONSTITUTION:A sealed container 67 disposed in a gas generator mainbody 40 consists of a cylindrical cup 69 with the bottom containing ignition charge 47 and a celluloid base plate 71 sealing its opening. When an igniter 53 is energized, the sealed container 67 burns due to combustion of explosive therein, it transfers to the ignition charge 47, and gas generating agent 43 burns. Gas flowing through a combustion chamber filter 55 and an air charging chamber 57 is purified by an upper filter 59 and a filter 61 for gas filtration, flows through a gas exhaust vent and flows into the air bag. And when a temperature inside of an outer casing becomes lower than an ignition temperature but higher than 170 deg.C, the base plate 71 ignites to ignite the ignition charge 47 certainly, so that the possibility of failure of the combustion chamber 41 and the like is precluded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator for deploying an airbag used for deploying an airbag such as an air bag for a collision safety device, a life saving bag, a rubber boat, an escape chute, or the like by a combustion gas.

[0002]

2. Description of the Related Art Conventionally, in a passenger car, a collision safety device for protecting a driver from a shock at the time of a collision, for example, an airbag having a volume of 60 liters, and the airbag is inflated by gas. And a gas generator for deploying an air bag for
Explosives filled in the gas generator for airbag deployment, or a gas generating agent composed of a similar composition is ignited and burned, and the airbag is instantly deployed by the generated gas,
It is designed to protect the driver from collisions and prevent serious injury to the driver.

FIG. 5 shows a gas generating device for deploying an air bag of this type. In FIG. 5, reference numeral 11 denotes a combustion chamber in which a plurality of gas generating agents 13 are accommodated in a laminated state. There is.

The gas generating agent 13 is in the shape of an annular plate having a through hole 15 formed in the center thereof, and an igniting agent 17 is contained in the through hole 15. These gas generating agents 13 are
It is housed in a hermetically sealed container 19, and at the center of the hermetically sealed container 19, a recess 21 is formed which is depressed toward the through hole 15 side of the gas generating agent 13.

An igniter 23 for burning the gas generating agent 13 is arranged in the recess 21. A combustion chamber filter 25 is arranged along the inner circumference of the combustion chamber 11,
Further, the charging chamber 27 that surrounds the combustion chamber 11 and allows the gas that has passed through the combustion chamber filter 25 to flow from the orifice 26 is
They are arranged in a ring.

A filling chamber filter composed of an upper filter 29 and a gas filtering filter 31 is housed in the filling chamber 27. Further, in the charging chamber 27, there is formed a gas outlet 33 for discharging the gas passing through the gas filtration filter 31 to the airbag.

In such an air bag deployment gas generator, when electricity is applied to the igniter 23, the explosive in the igniter 23 burns to ignite the igniting charge 17, and the combustion causes the gas generating agent to burn. 13 combusts, and the gas of the gas generating agent 13 passes through the combustion chamber filter 25 arranged along the inner circumference of the combustion chamber 11 and flows into the charging chamber 27, and then the upper filter 29 and the gas filtration filter. Purified by 31, passes through the gas outlet 33 and flows into the airbag, for example,
The airbag is sufficiently inflated in a short time of about 0.04 seconds.

[0008]

However, in such a gas generating device for deploying an air bag, since the igniting agent 17 is simply contained in the center of the gas generating agent 13, such as when assembling the hermetically sealed container 19 or the like. The ignition powder 17 is naked,
There was a problem that it was very difficult to handle.

Further, although it is contained in the hermetically sealed container 19, there is a risk that the ignition powder 17 may get wet due to aging. On the other hand, in such an air bag deployment gas generator, when the device is placed in a high temperature environment such as a fire, for example,
At about 390 ° C., the gas generating agent 13 in the apparatus reaches the ignition point and ignites itself, but the reaction rate at this time is very fast, and the combustion chamber 11 is formed at high temperature. Since the strength of the container is also reduced, there is a possibility that the container forming the combustion chamber 11 may burst.

Therefore, in order to solve such a problem, the inventor of the present invention firstly provides an air bag deploying gas generating apparatus in which a gas generating agent and an igniting agent are contained in a combustion chamber.
While accommodating the ignition powder in a closed container, the ignition powder contains an ignition temperature adjusting substance having an ignition temperature lower than the ignition temperature of the gas generating agent and higher than the maximum temperature that can normally occur in the vehicle. We filed an application for a mixed gas generator for airbag deployment (Japanese Patent Application No. 3-118789).

In the gas generator for airbag deployment according to this prior application, the igniting agent is placed in the combustion chamber while being housed in the closed container, and the temperature in the vehicle compartment is lower than the ignition temperature of the gas generating agent. Moreover, the ignition powder is ignited when the temperature becomes higher than the maximum temperature that can normally occur in the vehicle.

Therefore, according to the air bag deployment gas generator of this prior application, the handling property of the ignition powder can be greatly improved as compared with the conventional one, and the risk of the ignition powder getting wet is greatly increased as compared with the conventional one. Further, it is possible to provide a gas generator for deploying an airbag which can be reduced in number and further has an automatic ignition function in a high temperature environment.

However, in the air bag deployment gas generator according to this prior application, the ignition agent for a normal air bag deployment gas generator is lower than the ignition temperature of the gas generant, and
An ignition temperature adjusting substance having an ignition temperature higher than the highest temperature that can normally occur in a vehicle must be mixed, and the mixing process is troublesome.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to provide an automatic ignition function in a high temperature environment by using an ordinary gas generator for airbag deployment. An object of the present invention is to provide a gas generator for deploying an air bag that is made possible.

[0015]

According to a first aspect of the present invention, there is provided a gas generating device for expanding an air bag, wherein a gas generating agent and an igniting agent are contained in a combustion chamber arranged in a main body of the gas generating device. A hermetically sealed container containing an ignition agent and at least a part of which is formed of celluloid is arranged in the gas generating agent.

According to a second aspect of the present invention, there is provided at least a gas generating device for expanding an air bag in which a gas generating agent and an igniting agent are accommodated in a combustion chamber arranged in a main body of the gas generating apparatus. A closed container having a bottom formed of celluloid is arranged in the gas generating agent, and the bottom of the closed container is brought into contact with the inner wall of the gas generator main body.

[0017]

According to the first aspect of the present invention, when the temperature inside the vehicle interior is lower than the ignition temperature of the gas generating agent and higher than the maximum temperature that can normally occur inside the vehicle, the inner wall of the gas generator main body is closed. The heat conducted therethrough ignites the celluloid forming at least part of the closed container, which can ignite the ignition charge within the closed container.

According to a second aspect of the present invention, when the temperature inside the vehicle interior is lower than the ignition temperature of the gas generating agent and higher than the maximum temperature that can normally occur in the vehicle, the inner wall of the gas generator main body is closed. The heat conducted therethrough ignites at least the celluloid, which forms the bottom of the closed container, which is in contact with its inner wall, whereby the ignition charge in the closed container can be ignited.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a gas generator for airbag deployment according to the present invention. In the figure, reference numeral 40 represents a gas generator main body.

A combustion chamber 41 in which a plurality of gas generating agents 43 are accommodated in a laminated state is provided inside the gas generator main body 40.
And a charging chamber 57 are formed. Gas generating agent 43
Has an annular plate shape with a through hole 45 formed in the center, and a closed container 67 containing an ignition agent 47 is accommodated in the through hole 45.

The closed container 67 is arranged so that the square celluloid bottom plate 71 forming the bottom thereof is in contact with the inner wall 40a of the gas generator main body 40 facing the vehicle interior side.

As shown in FIGS. 2 and 3, the closed container 67 has a bottomed cylindrical cup 69 for containing the ignition powder 47.
And a square celluloid bottom plate 71 that seals the opening of the cup 69.

The cup 69 is made of, for example, polypropylene,
It is made of polystyrene and aluminum foil and has a wall thickness of, for example, 0.5 mm. Also, the bottom plate 7 made of celluloid
The wall thickness of 1 is 0.1 to 1.0 mm.

After accommodating the ignition powder 47 in the cup 69, the bottom plate 7 made of celluloid is placed in the opening of the cup 69.
1 is fixed in an airtight state. The celluloid bottom plate 71 is fixed to the cup 69 by, for example, applying an adhesive to one surface of the celluloid bottom plate 71 and storing the ignition powder 47 in the cup 69 in advance, and then quadrangular portion of the cup 69. It is performed by adhering a celluloid bottom plate 71 with an adhesive and sealing it.

These gas generating agents 43 are stored in a sealed container 49.
A recess 51 is formed at the center of the hermetically sealed container 49 and is recessed toward the through hole 45 side of the gas generating agent 43.

An igniter 53 for burning the gas generating agent 43 is arranged in the recess 51. A combustion chamber filter 55 is arranged along the inner circumference of the combustion chamber 41,
Further, the charging chamber 57 that surrounds the combustion chamber 41 and allows the gas that has passed through the combustion chamber filter 55 to flow from the orifice 56 is
They are arranged in a ring.

A gas filling chamber filter consisting of an upper filter 59 and a gas filtering filter 61 is housed in the gas filling chamber 57. Further, in the charging chamber 57, a gas outlet 63 is formed to let the gas that has passed through the gas filtration filter 61 flow out to the airbag.

In the figure, reference numeral 65 denotes an elastic ring member for fixing the hermetic container 49 in the combustion chamber 41. In the present embodiment configured as described above, when electricity is applied to the igniter 53, the closed container 67 is burned by the combustion of the explosive in the igniter 53, and the closed container 67 comes into contact with the igniter 53. Surface is broken, the ignition powder 47 is transferred,
The igniting agent 47 burns, and by this burning, the gas generating agent 43
Are combusted, and the gas of the gas generating agent 43 passes through the combustion chamber filter 55 arranged along the inner circumference of the combustion chamber 41 and flows into the charging chamber 57, and then the upper filter 59 and the gas filtration filter 61. And is inflated through the gas outlet 63 into the airbag, and the airbag is sufficiently inflated in a short time of, for example, about 0.04 seconds.

Further, according to the present embodiment, the temperature inside the vehicle is
When the temperature is lower than the ignition temperature of the gas generating agent 43 (about 390 ° C.) and higher than the maximum temperature that can occur in the vehicle under normal conditions, that is, 170 ° C. or higher, the inner wall 40a of the gas generator main body 40 The conductive container 67 can be closed by conduction heat.
The bottom plate 71 made of celluloid that forms the bottom of the container is ignited, and the igniting agent 47 in the closed container 67 is reliably ignited.
This eliminates the risk of damage to the container or the like forming the combustion chamber 41.

That is, it becomes possible to easily obtain the gas generator for deploying the air bag, which has the automatic ignition function under the high temperature environment. In the above-described embodiments, the case where the bottom of the closed container 67 is formed of the celluloid bottom plate 71 has been described, but the whole closed container 67 may be formed of celluloid, or the bottom is made of polypropylene, The cup 69 may be made of celluloid and formed of polystyrene, aluminum foil, or the like.

In the above embodiment, the case where the closed container 67 shown in FIGS. 2 and 3 is used has been described, but it may be box-shaped as shown in FIG. 4, for example. In this case, both or one of the upper box 67a and the lower box 67b is made of celluloid.

Further, in the above embodiment, the case where the celluloid bottom plate 71 forming the bottom of the closed container 67 is arranged in contact with the inner wall 40a of the gas generator main body 40 has been described. Since the temperature is 170 ° C., the conduction heat can reliably ignite a temperature lower than the ignition temperature of the gas generating agent 43 even at a position away from the inner wall 40a of the gas generator main body 40.
It may be arranged only in the recess 51.

[0033]

As described above, according to claims 1 and 2,
Since a part of the closed container containing the ignition agent is formed of celluloid, it is lower than the ignition temperature of the gas generating agent, and
At the highest temperature that can occur in the vehicle in normal times, the celluloid is ignited and the ignition agent can be ignited, and the automatic ignition function in a high temperature environment can be achieved.

In particular, when the celluloid bottom portion is arranged in contact with the inner wall of the gas generator main body, it is possible to reliably ignite the celluloid by the conduction heat.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a gas generator for deploying an airbag according to the present invention.

FIG. 2 is a cross-sectional view showing the closed container of FIG.

FIG. 3 is a top view of FIG.

FIG. 4 is a cross-sectional view showing a modified example of the closed container of FIG.

FIG. 5 is a cross-sectional view showing a conventional air bag deployment gas generator.

[Explanation of symbols]

 40 Gas Generator Main Body 40a Inner Wall 41 Combustion Chamber 43 Gas Generating Agent 47 Ignition Agent 67 Sealed Container 71 Bottom Plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kasumi Saigo Village, Nishishirakawa-gun, Fukushima Osamu Nagasaka letter 2 1 1 Shirakawa Laboratory, Nippon Koki Co., Ltd.

Claims (2)

[Claims] 1. An air bag deployment gas generator in which a gas generating agent and an igniting agent are accommodated in a combustion chamber arranged in a main body of the gas generating apparatus. A gas generator for airbag deployment, characterized in that a closed container formed of celluloid is arranged in the gas generating agent. 2. A gas generator for deploying an airbag, comprising a gas generating agent and an igniting agent contained in a combustion chamber arranged in the body of the gas generating apparatus, wherein the ignition agent is accommodated and at least the bottom is a celluloid. A gas generating apparatus for airbag deployment, characterized in that the airtight container formed in (1) is placed in the gas generating agent, and the bottom of the airtight container is in contact with the inner wall of the gas generating device body.