JPH079938A - 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. The purpose of the present invention is to drastically reduce the fear compared with the prior art. An igniting agent is arranged on the other end surface of the tubular pack, and the temperature is lower than the ignition temperature of the gas generating agent in a recess 93 formed in the other end plate of the tubular member 35, and It is configured by arranging an auto ignition 95 that fires at an ignition temperature higher than the highest temperature that can occur at times.

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.

The present invention solves the above problems and provides a gas generator for deploying an air bag capable of significantly reducing the risk of causing a rupture of a container in a high temperature environment. The purpose is to

[0007]

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, The ignition powder is placed on the other end surface of the tubular pack, and the temperature lower than the ignition temperature of the gas generant and the highest possible in normal times is provided in the recess formed in the other end plate of the tubular member. It is also equipped with an auto ignition that ignites at an ignition temperature higher than the temperature of It is.

[0008]

In the gas generator for deploying the airbag of the present invention,
If the device is exposed to a high temperature environment such as a fire and the temperature of the other end plate exceeds the maximum temperature that can occur under normal conditions, auto ignition will ignite, and the ignition agent will be more than the ignition temperature of the gas generant. It ignites at a very low temperature, which burns the gas generant.

[0009]

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 tubular 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 generating agent 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.

In this cylindrical pack 53, a large number of gas generating agents 57 having a through hole 55 formed in the center thereof are housed in a stacked 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.

At the center of the cap 61, a protrusion 68 for accommodating the ignition powder 66 is formed. 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 tubular pack 53, and the holder 73 and the cap 6 that 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 37 for sealing one end of the outer tubular member 35 is made of 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.

This caulking fixing is performed with the fitting portion 81 of the one end plate portion 37 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 at 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.

The other end surface 6 of the gas generating agent pack 51
As shown in FIG. 4, an urging member 89 made of, for example, a coil spring is arranged between the cap 61 that forms part 2 and the other end plate portion 39 of the outer tubular member 35.

In this embodiment, however, a concave portion 93 is formed in the other end plate portion 39 of the outer tubular member 35, and the concave portion 93 has a temperature lower than the ignition temperature of the gas generating agent 57, and An auto ignition 95 is arranged to ignite at a higher ignition temperature than the maximum temperature that can occur during normal times.

FIG. 5 shows the details of the auto-ignition 95. The auto-ignition 95 is a capsule-shaped closed container 101 including a cup 97 and a cap 99, and an ignition powder 103 contained in the closed container 101.
It consists of and.

In this embodiment, the pyrotechnic charge 103
Is the ignition temperature of the gas generant 57, for example, lower than 390 ° C. and the highest temperature that can normally occur in the vehicle, for example, an ignition temperature higher than 150 ° C., for example, 180 ° C. It is composed by mixing an ignition temperature adjusting substance having a temperature.

The ignition temperature adjusting substance is calcium,
It is formed of strontium, barium azide of alkaline earth metal alone or a mixture thereof.

Further, the ignition temperature adjusting substance and magnesium are coagulated with ethylene tetrafluoride and ethylene trifluoride as binders. That is, the ignition powder 103 of this embodiment is, for example, a cotton-like ignition powder composed of 50% by weight of barium azide, 28% by weight of magnesium, 18% by weight of tetrafluoroethylene and 4% by weight of ethylene trifluoride. , 1.1g of pyrotechnic charge produces 1940 heat
The calorific value is 41 cc / g and the calorific value is 41 cc / g. The calorific value of the conventional boron-potassium nitrate igniter is 1790 cal / g and the gas generating rate is 79 cc / g. It has been lowered.

The pyrotechnic charge 103 is manufactured, for example, as described below. That is, for example, in order to obtain the ignition powder 103 having a weight of 300 g, 12 g of trifluoroethylene was dissolved in toluene and magnesium 84 was added.
g, sufficiently moisten the magnesium, add 54 g of ethylene tetrafluoride and 150 g of barium azide to the moist magnesium and mix, then dry through a 12 mesh sieve 5 times, and after this drying The cotton-like pyrotechnic charge 103 can be obtained by stirring with a mixer.

In the air bag deployment gas generator described above, when electricity is applied to the igniter 85, the igniting charge 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.

Thus, in the air bag deployment gas generator constructed as described above, the ignition powder 66 is arranged on the other end face 62 of the tubular pack 53, and the other end of the outer tubular member 35 is also placed. Since the auto ignition 95 that ignites at the ignition temperature lower than the ignition temperature of the gas generating agent 57 and higher than the maximum temperature that can occur in normal times is arranged in the recess 93 formed in the plate portion 39, the device is ignited. When the temperature of the other end plate portion 39 exceeds a temperature higher than the maximum temperature that can occur under normal conditions, the auto ignition 95 ignites, and the ignition powder 66 is sufficiently higher than the ignition temperature of the gas generating agent 57. Since the gas generating agent 57 is ignited at a very low temperature, and the gas generating agent 57 is combusted by this, a container forming a combustion chamber in a high temperature environment, for example, the inner tubular member 47 and the outer tubular member 35, The possibility of causing 裂等 can be greatly reduced than the prior art.

That is, in the above-described gas generating apparatus for deploying the airbag, when a vehicle fire or the like occurs, the temperature of the other end plate portion 39 of the outer tubular member 35 is set to the ignition temperature of the gas generating agent 57, for example, Since the auto ignition 95 is automatically ignited when the temperature is lower than 390 ° C. and is higher than the highest temperature that can normally occur in the vehicle, for example, higher than 180 ° C., the outer tubular member 35 and the inner tubular member 35 are ignited during this ignition. The member 47 maintains a predetermined compressive strength, which can greatly reduce the possibility of causing a rupture of the container forming the combustion chamber or the like in a high temperature environment as compared with the related art.

Further, in the above-described gas generator for deploying the air bag, since the auto ignition 95 is arranged in the recess 93 formed in the other end plate portion 39 of the outer tubular member 35, in the event of a fire or the like. Since the temperature of the outer atmosphere is quickly transmitted to the auto ignition 95 via the outer tubular member 35, the operation of the auto ignition 95 becomes accurate.

Further, in the above-described gas generating apparatus for deploying the air bag, since the auto ignition 95 is arranged in the recess 93 formed in the other end plate portion 39, the apparatus can be made small and compact. it can.

FIG. 6 shows another embodiment of the present invention. In this embodiment, a collar portion 95a is formed on one side of the auto ignition 95A, and the collar portion 95a is formed on the other side end plate portion 39. It is accommodated in a recess 93a formed in the.

In this embodiment, almost the same effect as the above-mentioned embodiment can be obtained, but since the collar portion 95a is formed in this embodiment, the temperature of the outside atmosphere is
Transmission can be performed more quickly and reliably, and the capacity of the auto ignition 95A can be increased.

[0037]

As described above, in the gas generating device for deploying an air bag of the present invention, the temperature of the other side end plate portion is the maximum temperature that can occur at normal times when the device is exposed to a high temperature environment such as a fire. When the temperature exceeds a higher temperature, the auto-ignition ignites, and the igniting agent ignites at a temperature sufficiently lower than the ignition temperature of the gas generating agent, which burns the gas generating agent.
There is an advantage that 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.

[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 auto ignition of FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the gas generator for deploying an airbag of the present invention.

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 Tubular 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 93 recess 95 auto ignition

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 surface, and an igniter arranged in one end plate portion of the tubular member are provided, and the other end surface of the tubular pack is provided. In addition, while arranging the ignition powder, in the recess formed in the other end plate portion of the tubular member,
A gas generator for deploying an air bag, characterized in that an auto ignition that is ignited at an ignition temperature lower than the ignition temperature of the gas generating agent and higher than the highest temperature that can occur at normal times is arranged.