JPH06227358A - Gas generator - Google Patents

Abstract

PURPOSE:To provide a gas generator which prevents any vibration in a ring vessel with a gassing agent from occurring and the is none of damage or deformation in this ring vessel, in this gas generator for a rider protective device in a vehicle. CONSTITUTION:In a gas plant for a rider protective device in a vehicle housing an igniter with an airtight holding vessel 24 containing a transfer charge 22 and a ring vessel 48 containing a gassing agent 36 generating gas by means of ignition, in the body of a casing 12 of a gas generator 10, a fixative 50 is arranged in a clearance part between the ring vessel 48 and the casing body 12 housing this vessel.

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 a vehicle occupant protection device, and more particularly to prevention of vibration of a gas generant container contained therein.

[0002]

2. Description of the Related Art Conventionally, there has been known a vehicle occupant protection device for inflating an air bag with gas generated by a gas generator in order to ensure the safety of the occupant in the event of a vehicle collision. This gas generator has, for example, a structure in which a gas generating agent is housed in a gas generator casing together with an igniter containing a igniting agent.

Since the gas generating agent usually contains sodium azide as a main component, it is necessary to prevent moisture, so that the gas generating agent is contained in a container which can be kept airtight as a gas generating agent container. The gas generating agent container is formed in an annular shape, and a light metal such as an aluminum alloy is used as a material so that the gas generating agent inside is easily ignited. When the annular container containing the gas generating agent is housed in the gas generator casing body, the annular container does not vibrate if the annular storage space of the casing body and the outer dimension of the annular container containing the gas generating agent match. However, if there is a gap between the annular container and the storage space, the annular container may vibrate and be damaged. In order to minimize container vibration, it is necessary to strictly control the overall height of the casing body so that the clearance between the storage space and the annular container is minimized.

As a method for preventing the vibration of the container, Japanese Patent Laid-Open No. 3-92447 proposes to dispose an annular elastic member between the inner surface of the upper part of the casing body and the outer surface of the outer surface of the lid of the annular container. There is. However, since the elastic member must absorb vibration without deforming the annular container, its thickness and elastic modulus must be strictly controlled. Further, when a metal member is used as the elastic body, it does not uniformly contact the annular container of the gas generating agent, which may damage or damage the annular container.

[0005]

It is desired to develop a simple method capable of preventing the vibration of the annular container containing the gas generating agent without deforming the annular container.

[0006]

In order to achieve the above object, the gas generator of the present invention has an igniter having a container containing a transfer agent in a gas generator casing body, and generates gas by ignition. In a gas generator for a vehicle occupant protection device containing a gas generating agent,

(1) A gas generator characterized in that the gas generating agent is housed in an annular container, and the annular container is fixed in the casing body with a fixing agent.

(2) The gas generator according to item 1 above, wherein the fixative has a heat resistance of 150 ° C. or higher.

(3) The gas generator according to the above-mentioned item 1, wherein the fixing agent is arranged partially or entirely on a portion other than the ignition gas inlet surface and the generated gas outlet surface of the gas generating agent annular container. I will provide a.

The fixing agent in the present invention preferably has a heat resistance of 150 ° C. or higher. When the annular container of the gas generating agent is assembled to the main body of the gas generator casing, it is appropriately soft to fill the gap, and after the assembling. It is preferable that it cures quickly and has no elasticity after curing. Further, it is preferable that the adhesiveness and the strength after curing have sufficient strength even at a high temperature of 150 ° C. or higher.

Examples of the fixing agent include epoxy resin, heat resistant adhesive, mineral clay, heat resistant sealant and the like.
Particularly preferred is a heat resistant sealant. An example of the heat-resistant sealant is the product name "Fireproof Putty" manufactured by Cemedine Co., Ltd. The fixing agent may be arranged at any position as long as it does not interfere with the ignition gas inlet to the annular container and the gas outlet of the generated gas, and may be partial or annular.

[0012]

According to the present invention, the gas generating agent is housed in the annular container, and the annular container is fixed by the fixing agent in the casing body, so that the vibration of the annular container is prevented and the destruction of the annular container is prevented. You can

Since it is sufficient to dispose the fixative on a portion other than the ignition gas inlet surface and the generated gas outlet surface of the gas generating agent annular container, it does not hinder the gas generation from the gas generator.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples. FIG. 1 is a sectional view of a gas generator according to one embodiment of the present invention, and FIG. 2 is a sectional view of another embodiment of the present invention.

1 and 2, a gas generator 10 for a vehicle occupant protection system according to the present invention comprises a gas generator casing body 12 for internally generating gas. The outer shape of the gas generator casing body 12 is substantially cylindrical. An outlet 16 and an igniter 18 that constitute the ignition device 14 are provided in the central portion of the igniter 12, and a cylindrical ignition chamber 20 is formed in a portion corresponding to the tip end side of the igniter 18. A container 24 containing a transfer agent 22 is housed in the chamber 20. The transfer charge container 24 is formed of, for example, an aluminum foil having a thickness of about 50 to 150 μm. The outlet 16 is connected to the battery 30 and a shock sensor 32 that operates at the time of a vehicle collision or the like via conductors 26 and 28. When the shock sensor 32 operates, a current required for ignition from the battery 30 is generated. It is supplied to the igniter 18.

An annular gas generating chamber 3 is provided around the ignition chamber 20 and the igniter 18 of the gas generator casing body 12.
4 is formed, and an annular container 4 in which a gas generating agent 36 in the form of granules or tablets is included in the gas generating chamber 34.
8 is stored. The annular container 48 has a thickness of, for example, 1
The thickness is about 50 to 250 μm. Annular container 4
8 is a fixing agent 50 (trade name "fireproof putty", manufactured by Cemedine Co., Ltd.) for filling the gap with the casing body 12 in the gas generation chamber 34, which is partially or annularly arranged and bonded,
It is fixed. An ignition hole 38 communicates between the ignition chamber 20 and the gas generation chamber 34. In addition, around the gas generation chamber 34 of the gas generator casing body 12,
A filter chamber 40 is formed in an annular shape, and a filter 42 is housed inside the filter chamber 40. And the gas generation chamber 34
The filter chamber 40 and the filter chamber 40 are communicated with each other through the gas passage hole 44 (FIG. 1) or through the cooling member chambers 54 and 58 containing the cooling members 52 and 56 (FIG. 2). The filter chamber 40 and the outside are communicated with each other through a gas discharge hole 46. A large number of gas discharge holes 46 are formed around the gas generator casing body 12, and the gas discharged from the gas discharge holes 46 is supplied to an airbag (not shown).

Two gas generators made of aluminum alloy having the structure shown in FIG. 1 were manufactured, and a 5-minute sweep peak acceleration of 6.0 G with a Log Sweep of 15 to 600 Hz, and 3 in each of two horizontal and vertical axis directions.
Shake at room temperature for 0 hour, total 60 hours. When one of them was disassembled after vibration, the gas generating agent and the annular container were not deformed at all and no scratches were observed. The thickness of the fixative 50 was about 1.5 mm. The other gas generator did not decompose, but was ignited by the igniter 18 and operated, and then cooled and decomposed. As a result, no change was observed in the fixative 50.

Separately, a gas generator made of an aluminum alloy having the structure of FIG. 1 but without the fixing agent 50 was vibrated under the above conditions and then disassembled. The part was worn and perforated. Also, the annular container was deformed at all corners. From this, the effect of the fixative according to the present invention was confirmed.

When a gas generator made of an aluminum alloy having the structure shown in FIG. 2 was manufactured and disassembled after a vibration test under the same conditions as above, there was no change in the gas generating agent annular container.

A gas generator made of an aluminum alloy having the structure of FIG. 2 but without the fixing agent 50 was vibrated under the above-mentioned conditions and then disassembled. A scratch was recognized on the contact surface with the passage hole 44. From the above, the effect of the fixative according to the present invention was confirmed.

[0021]

By arranging the fixative in the gap between the gas generating agent annular container and the gas generator casing main body that houses the same, the vibration of the gas generating agent annular container is prevented, and damage or deformation due to the vibration is prevented. It has the effect of preventing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gas generator according to one embodiment of the present invention.

FIG. 2 is a sectional view of a gas generator according to another embodiment of the present invention.

[Explanation of symbols]

 10 Gas Generator 12 Gas Generator Casing Main Body 14 Ignition Device 16 Outlet 18 Ignition Tool 20 Ignition Chamber 22 Transfer Charge 24 Airtight Holding Container 26, 28 Conductor Wire 30 Battery 32 Impact Sensor 34 Gas Generation Chamber 36 Gas Generation Agent 38 Ignition Hole 40 Filter Chamber 42 Filter 44 Gas Passage Hole 46 Gas Release Hole 48 Annular Container 50 Fixing Agent 52 Cooling Member 1 54 Cooling Member Chamber 1 56 Cooling Member 2 58 Cooling Member Chamber 2 60 Flange 62 Internal Partition Wall

Claims (3)

[Claims] 1. A gas generator for a vehicle occupant protection device, wherein a gas generator casing main body contains an ignition device and a gas generant for generating gas by ignition, the gas generator being contained in an annular container. The gas generator, wherein the annular container is fixed in the casing body with a fixing agent. 2. The gas generator according to claim 1, wherein the fixative has a heat resistance of 150 ° C. or higher. 3. The gas generator according to claim 1, wherein the fixing agent is partially or entirely disposed on the annular container other than the ignition gas inlet surface and the generated gas outlet surface.