JPH079936A - Gas generator for airbag deployment - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] An airbag deployment gas generator used to deploy an airbag for a collision safety device with combustion gas, causing rupture of a container in a high temperature environment. It is an object of the present invention to be able to greatly reduce the fear compared with the conventional one, and to reliably maintain the interval between the igniter side of the gas generant pack and the igniter. The one end plate portion 37 is caulked and fixed toward the tubular pack 53 side by the opening end portion of the tubular member 35, and a protruding portion for accommodating the ignition powder is provided on the other end surface of the tubular pack. A heat generating member formed of a metal having good thermal conductivity between the tip surface of the protruding portion and the other end plate portion 39 and having a function of urging the tubular pack toward the one end plate portion. Transmission member 91
Arrange and configure.

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, etc. 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 includes an airbag and a gas generating device for deploying the airbag with a gas. When a passenger vehicle collides, a gas generant consisting of explosives or a similar composition filled in the gas generator for airbag deployment is ignited and burned, and the airbag is instantly deployed by the generated gas. As a result, the driver is protected from a collision and serious injury to the driver is prevented.

FIG. 7 shows that the present applicant previously filed Japanese Patent Application No. 3-2.
This shows a gas generating device for airbag deployment, which has been applied for a patent as No. 99116. This gas generating device for airbag deployment includes an elongated outer tubular member 13 in which a plurality of gas outlets 11 are formed on the outer periphery. , The inner tubular member 1 which is inserted into the outer tubular member 13 and has a gas flow hole 15 formed on the outer periphery thereof
7, a final filter 19 arranged between the outer tubular member 13 and the inner tubular member 17, and a through hole 21 formed in the center of the inner tubular member 17 in a stacked state in the axial direction. The gas generating agent 23 and the igniting agent 27 are arranged in one side of the inner tubular member 17, and the gas generating agent 23 and the igniting agent 27 are contained in the gas generating agent pack 29. It is housed in.

According to this air bag deployment gas generator, the combustion gas capacity of the gas generating agent 23 can be greatly increased as compared with the conventional one, and a large amount of combustion gas can be reliably purified.

[0005]

However, in such an air bag deployment gas generator, when the device is placed in a high temperature environment such as a fire, for example, about 390 ° C.
Then, the gas generating agent 23 in the device reaches the ignition point and ignites itself, but the reaction speed at this time is very fast, and at high temperature, the container of the gas generating agent 23 is Since the strength is also reduced, there is a risk that the container may burst.

Further, in such an air bag deploying gas generator, the gas generant pack 23 is simply accommodated in the inner cylindrical member 17, so that the gas generant pack 23 is contained.
There is a possibility that the distance between the igniter 27 side and the igniter 25 may not be reliably maintained, and in particular, if the distance between the igniter 25 and the igniter 27 increases, the ignition performance may deteriorate. It was

The present invention has solved the above-mentioned problems, and can greatly reduce the risk of causing a rupture of a container or the like in a high-temperature environment as compared with the prior art, and at the same time, on the ignition powder side of the gas generant pack. An object of the present invention is to provide a gas generating device for deploying an air bag, which is capable of reliably maintaining the distance between the igniter and the gas generator.

[0008]

A gas generator for deploying an air bag according to the present invention has a length in which both ends are sealed by one end plate part and another end plate part, and a plurality of gas outlets are formed on the outer circumference. A plurality of gas generating agents in the axial direction of a long tubular pack and a long tubular pack which is housed in the tubular member and whose both ends are sealed by one end face and the other end face. Are housed in a laminated state, further comprising a gas generating agent pack in which an igniting agent is arranged in the vicinity of the one side end surface, and an igniter arranged in the one side end plate portion of the tubular member, While crimping the one side end plate portion toward the tubular pack side by the opening end portion of the tubular member, the other end surface of the tubular pack is formed with a projecting portion for accommodating an ignition powder, Between the tip surface of this protrusion and the other end plate, a metal with good thermal conductivity is used. Those formed by arranging heat transfer member having a function for biasing the one end plate portion the tubular pack.

[0009]

In the gas generator for deploying the airbag of the present invention,
When the device is exposed to a high temperature environment such as a fire and the temperature of the other end plate rises, the heat of the other end plate is placed between the protruding part of the tubular pack and the other end plate. It is transferred to the igniting agent contained in the protrusion via the heat transfer member, and the igniting agent ignites at a temperature sufficiently lower than the ignition temperature of the gas generating agent, whereby the gas generating agent is burned.

Further, in this air bag deployment gas generator, when the one end plate is caulked by the open end of the tubular member toward the tubular pack, the tubular pack has the other end plate. However, since the heat transfer member is deformed toward the other end plate portion side at this time, it is possible to prevent a large load from being applied to the protruding portion.

On the other hand, after the caulking process is completed, the tubular pack is moved toward the one end plate portion side by the urging force of the heat transfer member, and the one end face of the tubular pack is securely attached to the one end plate portion. Can abut.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show an embodiment of a gas generator for airbag deployment according to the present invention. In the drawings, reference numeral 35 is a length sealed by one end plate 37 and the other end plate 39. The scale-shaped outer cylindrical member is shown.

A large number of gas outlets 41 are formed on the outer periphery of the outer tubular member 35. The other end plate 39 is integrally formed with a vehicle-side mounting portion 43.

Inside the outer tubular member 35, a tubular final filter 45 is arranged. This final filter 45
Is made up of, for example, fine wire mesh, woven woven wire mesh, etc., and is cooled to the extent that the airbag does not burn, and the combustion residues contained in the combustion gas are removed, and the airbag is harmless. It has the function of supplying only nitrogen gas.

An inner cylindrical member 47 is inserted inside the final filter 45. A large number of gas circulation holes 49 are formed on the entire outer circumference of the inner tubular member 47.

A gas generant pack 51 is housed in the inner cylindrical member 47. This gas generant pack 51
As shown in FIG. 3, has a bottomed elongated cylindrical pack 53 made of aluminum.

A large number of gas generating agents 57 each having a through hole 55 formed in the center are housed in the cylindrical pack 53 in a laminated state in the axial direction. One side of the tubular pack 53 is
The one side end surface 59 is hermetically sealed, and the other side is hermetically sealed by the other side end surface 62 made of, for example, an aluminum cap 61.

A cylindrical spacer 63 is arranged on one side of the cylindrical pack 53. This spacer 63
For example, an ignition powder 64 made of aluminum and containing an autoignition explosive that ignites at a low temperature of 180 ° C., for example, is arranged in the center of the spacer 63.

The ignition powder 64 is contained in an ignition powder pack 65. On the other hand, the cap 61 arranged on the other side of the tubular pack 53 is formed by winding the outer periphery of the tubular pack 53, and forming a tubular winding fastening portion 67.

A protrusion 68 for accommodating the ignition powder 66 is formed in the center of the cap 61. The ignition powder 66 includes, for example, an ignition powder for auto ignition that ignites at a low temperature of 180 ° C.
Are contained in the ignition powder pack 69.

A space 71 is formed on the side of the cap 61 in the cylindrical pack 53, and the holder 73 and the cap 6 which come into contact with the gas generating agent 57 are formed in the space 71.
A holder 75 that comes into contact with the No. 1 is arranged, and both ends of the coil spring 77 are supported between the holders 73 and 75.

As shown in FIG. 1, the one end plate portion 37 for sealing one end of the outer tubular member 35 comprises an end cap, and the open end 79 of the outer tubular member 37 allows the tubular pack 53 side. It is fixed by crimping toward.

In this caulking fixing, the fitting portion 81 of the one end plate portion 37 is fitted to the opening end of the inner tubular member 47,
This is performed by bending the open end portion 79 of the outer tubular member 37 toward the one side end plate portion 37 with a predetermined pressure by using a press machine or the like, and plastically deforming it.

A through hole 83 is formed in the center of the one end plate portion 37, and an igniter 85 is fitted and inserted in the through hole 83 and fixed to the one end plate portion 37 by caulking. A packing 87 made of, for example, flame-retardant silicone rubber is disposed between both ends of the final filter 45 and the one end plate portion 37 and the other end plate portion 39.

In this embodiment, however, the tubular pack 5
Between the tip surface 68a of the protruding portion 68 of No. 3 and the end plate portion 39 on the other side, a function of biasing the tubular pack 53 toward the end plate portion 37 on the one side is made of metal having good thermal conductivity. The heat transfer member 91 that it has is arranged.

5 and 6 show details of the heat transfer member 91. The heat transfer member 91 is made of a metal having good heat conductivity such as copper, iron, and stainless steel, and has an inner circumference of the collar portion 93. A plurality of leaf spring portions 95 are integrally formed in the.

In the air bag deployment gas generator described above, when electricity is applied to the igniter 85, the igniting agent 64 burns, and this burning causes the gas generant 57 to burn and the gas generant pack 51 of the gas generant pack 51. The tubular pack 53 is the inner tubular member 4
7, the combustion gas passes through the gas circulation holes 49 of the inner tubular member 47, flows into the final filter 45, is purified by the final filter 45, and is burned in the gas of the outer tubular member 35. It flows into the airbag from the outlet 41.

In this embodiment, the outer tubular member 3
When electricity is applied to the igniter 85 arranged on one side of
First, the igniting agent 64 on one side burns, the gas generating agent 57 on the igniter 85 side starts burning, and the igniting agent 66 on the other side starts.
Are burned, and the gas generating agent 57 on the side of the ignition powder 66 on the other side is burned.

In the air bag inflating gas generator constructed as described above, when the temperature of the other end plate 39 rises when the device is exposed to a high temperature environment such as a fire, the other end plate 39 rises. The heat of 39 passes through the heat transfer member 91 arranged between the tip surface 68 a of the protruding portion 68 of the tubular pack 53 and the other end plate 39, and the ignition powder 66 contained in the protruding portion 68. Is transmitted to the gas generating agent 57, and the ignition agent 66 has a temperature sufficiently lower than the ignition temperature of the gas generating agent 57, for example, 390 ° C.
Since the gas generating agent 57 is ignited and the gas generating agent 57 is combusted by this, the risk of causing a rupture of the container or the like in a high temperature environment can be significantly reduced as compared with the related art.

Further, the plate spring portion 95 of the heat transfer member 91 presses the one end surface 59 of the tubular pack 53 toward the one end plate portion 37 in which the igniter 85 is housed, and thus the tubular pack. It is possible to reliably maintain the distance between the igniter 64 arranged on one side of 53 and the igniter 85, and improve the reliability of the ignition of the igniter 64 by the igniter 85.

Further, in the above-described air bag deployment gas generator, when the one side end plate portion 37 is caulked by the open end portion 79 of the outer tubular member 35 toward the tubular pack 53 side, the tubular pack is formed. Although 53 is moved toward the other side end plate portion 39, at this time, the plate spring portion 95 of the heat transfer member 91 is deformed toward the other side end plate portion 39 side, so that a large load is applied to the protruding portion 68. It is prevented from acting.

In this embodiment, a large load is surely prevented from acting on the projecting portion 68, so that the tightening portion 67 of the cap 61 around the tubular pack 53 is surely prevented from opening. be able to.

In the embodiment described above, the example in which the leaf spring portion 95 is formed on the heat transfer member 91 to serve as the urging means has been described, but the present invention is not limited to this embodiment. For example, it goes without saying that the heat transfer member may be formed of a disc spring or the like.

[0034]

As described above, in the air bag deployment gas generator of the present invention, when the temperature of the other end plate increases when the device is placed in a high temperature environment such as a fire, the other end plate part rises. Of the heat is transferred to the igniting agent contained in the protruding section via the heat transfer member arranged between the tip surface of the protruding section of the tubular pack and the other end plate section, and the igniting agent generates gas. Since the gas generating agent is ignited at a temperature sufficiently lower than the ignition temperature of the agent, the gas generating agent is combusted, so that the risk of causing a rupture of the container or the like in a high temperature environment can be greatly reduced as compared with the conventional case.

Further, since the one end surface of the tubular pack is pressed by the heat transfer member toward the one end plate portion in which the igniter is housed, the ignition powder arranged on one side of the tubular pack is prevented. The distance from the igniter can be reliably maintained.

Further, in the air bag deployment gas generator of the present invention, when the one end plate is caulked by the opening end of the tubular member toward the tubular pack side, the tubular pack has the other end. Even after moving to the plate side, after the caulking process is completed,
The heat transfer member moves and presses the one end surface of the tubular pack toward the one end plate portion in which the igniter is housed, which is advantageous in that caulking can be reliably performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a gas generator for deploying an airbag of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view showing the gas generant pack of FIG.

FIG. 4 is an enlarged view showing details of the other end plate portion in FIG. 1 and its vicinity.

5 is a cross-sectional view showing the heat transfer member of FIG.

FIG. 6 is a top view of FIG.

FIG. 7 is a vertical cross-sectional view showing a gas generating device for airbag deployment, which the applicant of the present invention has previously filed.

[Explanation of symbols]

 35 Outer Cylindrical Member 37 One Side End Plate 39 Other Side End Plate 41 Gas Outlet 49 Gas Flow Hole 51 Gas Generating Agent Pack 53 Cylindrical Pack 57 Gas Generating Agent 59 One Side End Face 61 Cap 62 Other Side End Face 64, 66 igniting agent 79 open end 85 igniter 91 heat transfer member

Claims (1)

[Claims] 1. A long tubular member whose both ends are sealed by one end plate and the other end plate, and a plurality of gas outlets are formed on the outer circumference, and a long tubular member housed in this tubular member. In addition, in the axial direction of a long tubular pack whose both ends are sealed by one end face and the other end face, a plurality of gas generating agents are stored in a laminated state,
Furthermore, a gas generating agent pack in which an igniting agent is arranged in the vicinity of the one side end face, and an igniter arranged in the one side end plate part of the tubular member are provided, and the one side end plate part is provided. The opening end of the tubular member is caulked and fixed toward the tubular pack side, and the other end surface of the tubular pack is provided with a projecting portion for accommodating the ignition powder. A heat transfer member, which is made of a metal having good heat conductivity and has a function of urging the tubular pack toward the one end plate, is disposed between the other end plate and the other end plate. A gas generator for airbag deployment characterized by.