JPH079935A - Air bag unfolding gas generating device - Google Patents

Abstract

PURPOSE:To remarkably reduce the fear of bursting a container under the high temperature environment in comparison with a conventional one, and to maintain a space between the ignition powder side of a gas generating agent pack and an igniter securely in an air bag unfolding gas generating device to be used for unfolding an air bag of collision safety device by the combustion gas. CONSTITUTION:On end plate part 37 is caulked toward a cylindrical pack 53 for fixation by an opening end of a cylindrical member, and the other end surface 39 of the cylindrical pack 53 is formed with a projecting part for housing the ignition powder. A heat transmitting member 91, which is pressed to the other end plate part by an energizing member, is fitted to this projecting part by fitting load smaller than the energizing force of the energizing member. The projecting part is fitted in a recessed part formed in the end plate part by a fitting load smaller than the energizing force of the energizing member.

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. 8 shows that the applicant of the present invention has 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]

According to a first aspect of the present invention, there is provided a gas generator for deploying an air bag, both ends of which are closed by one end plate and the other end plate, and a plurality of gas outlets are formed on the outer circumference. A plurality of gas generations in the axial direction of the long tubular member and the long tubular pack which is housed in the tubular member and whose both ends are closed by one end face and the other end face. The agent is stored in a stacked state, and further, a gas generating agent pack in which an igniting agent is arranged in the vicinity of the one end face, an igniter arranged in the one end plate portion of the tubular member, and the cylinder The one side end plate, which is disposed between the other end plate portion of the cylindrical member and the other end surface of the tubular pack, and which urges the tubular pack toward the igniter side. Part is fixed by caulking toward the tubular pack side by the open end of the tubular member, and On the other side end surface, a projecting portion for accommodating the ignition powder is formed with a predetermined gap from the other side end plate portion, and the other side end plate portion is formed on the projecting portion by the biasing member. The heat transfer member that is pressed against is fitted with a fitting load smaller than the urging force of the urging member.

According to a second aspect of the present invention, there is provided a gas generating device for deploying an air bag, which has a long tubular shape in which both ends are closed by one end plate portion and the other end plate portion, and a plurality of gas outlets are formed on the outer circumference. A plurality of gas generating agents are stored in a stacked state in the axial direction of the member and the long tubular pack which is housed in this tubular member and whose both ends are closed by one end face and the other end face. Further, a gas generating agent pack in which an igniting agent is arranged in the vicinity of the one end face, an igniter arranged in one end plate part of the tubular member, and the other end of the tubular member. A urging member that is arranged between the plate portion and the other end surface of the tubular pack and urges the tubular pack toward the igniter side; and the one end plate portion is the tubular member. While caulking and fixing toward the tubular pack side by the open end of the, on the other end surface of the tubular pack, A projecting portion for accommodating the explosive is formed, and the projecting portion is applied to the biasing member in a state where a predetermined gap is provided with respect to the bottom surface of the concave portion in the concave portion formed in the other side end plate portion. It is fitted with a fitting load smaller than the force.

[0010]

In the air bag deployment gas generator of claim 1, when the device is exposed to a high temperature environment such as a fire and the temperature of the other end plate increases, the heat of the other end plate is released. Is transferred to the igniting agent contained in the protruding section through the heat transfer member fitted to the protruding section of the igniting section, and the igniting agent ignites at a temperature sufficiently lower than the ignition temperature of the gas generating agent. Burned.

In this air bag deployment gas generator, when the one end plate is caulked toward the tubular pack side by the opening end of the tubular member, the tubular pack has the other end plate portion. The protruding portion is formed with a predetermined gap from the other end plate portion, and is inserted into the heat transfer member with a fitting load smaller than the urging force of the urging member. Therefore, the protrusion moves relatively easily toward the front, and a large load is prevented from acting on the protrusion.

On the other hand, after the caulking process is completed, the protruding portion is fitted into the heat transfer member with a smaller fitting load than the urging force of the urging member, so that the urging force of the urging member causes the tubular pack. Can be moved toward the one side end plate portion side, and the one side end surface of the tubular pack can be reliably brought into contact with the one side end plate portion.

In the gas generator for deploying an air bag according to a second aspect, when the temperature of the other end plate portion rises when the device is exposed to a high temperature environment such as a fire, the heat of the other end plate portion fits into the recess. The igniting agent is transmitted to the igniting agent contained in the protruding portion of the inserted cylindrical pack, 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 opening end of the tubular member toward the tubular pack side, the tubular pack has the other end plate portion. However, when the projection is provided in the recess formed in the other end plate portion with a predetermined gap from the bottom surface of the recess, a fitting load smaller than the biasing force of the biasing member. Since it is fitted in, the protrusion moves relatively easily toward the front, and a large load is prevented from acting on the protrusion.

On the other hand, after the caulking process is completed, the projecting portion is fitted into the recess formed in the other end plate portion with a smaller fitting load than the biasing force of the biasing member. The cylindrical pack is moved toward the one end plate portion side by the biasing force of, and the one end surface of the cylindrical pack can be reliably brought into contact with the one end plate portion.

[0016]

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 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.

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.
6 is 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 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 is composed of an end cap, and the open end portion 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 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 space between the cap 61 forming the other end surface 62 of the gas generant pack 51 and the other end plate portion 39 of the outer tubular member 35 is shown in FIG. Thus, the biasing member 89 including, for example, a coil spring is arranged.

The tip of the projecting portion 68 is arranged with a predetermined gap L with respect to the other end plate portion 39. The projecting portion 68 is attached to the other end plate 39 by the biasing member 89.
The heat transfer member 91 that is pressed against is fitted with a fitting load smaller than the biasing force of the biasing member 89.

5 and 6 show the details of the heat transfer member 91. The heat transfer member 91 is made of a metal having good heat conductivity such as aluminum or copper, and has a collar portion 93.
A plurality of fitting pieces 95 fitted to the protrusion 68 are provided on the inner circumference of the
Are erected and integrally formed.

In this embodiment, the fitting load of the heat transfer member 91 to the projecting portion 68 is, for example, 0.2 to 1.2 kg, while the biasing force of the biasing member 89 is 3.8 kg. ing. Further, the other end of the biasing member 89 is brought into contact with the inside of the flange portion 93 of the heat transfer member 91, so that the flange portion 93 has the other side end plate portion 39.
It is pressed with a predetermined pressing force.

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.

In the air bag deployment 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 part 39 rises. The heat of 39 is transferred to the igniting agent 66 housed in the projecting section 68 via the heat transfer member 91 fitted to the projecting section 68 of the tubular pack 53, and the igniting agent 66 ignites at the ignition temperature of the gas generant 57. For example, since the gas generating agent 57 is ignited at a temperature sufficiently lower than 390 ° C., for example, 180 ° C., the possibility of causing a rupture of the container or the like in a high temperature environment is greatly reduced as compared with the conventional case. be able to.

Further, the urging member 89 allows the tubular pack 53.
Since one side end surface 59 of the igniter 85 is pressed toward the one side end plate portion 37 in which the igniter 85 is housed, the interval between the igniter 64 and the igniter 85 arranged on one side of the tubular pack 53 is reduced. This can be reliably maintained, and the reliability of ignition of the ignition charge 64 by the igniter 85 can be improved.

Further, in the above-described air bag deployment gas generator, the heat transfer member 91 is biased to the projecting portion 68.
Since the fitting load smaller than the biasing force of 9 is used, the one end plate 37 is swaged toward the tubular pack 53 side by the open end 79 of the outer tubular member 35 when the tubular pack 53 is swaged. Is moved to the other end plate portion 39 side, the one end surface 59 of the tubular pack 53 is moved to the one end plate portion where the igniter 85 is housed by the urging member 89 after the caulking process is completed. Since it is moved and pressed toward 37, crimping can be performed reliably.

In the air bag deployment gas generator described above, when the one end plate 37 is caulked by the open end 79 of the outer tubular member 35 toward the tubular pack 53, the tubular pack is swung. Although 53 is moved toward the other side end plate portion 39, the projecting portion 68 is formed with a predetermined gap from the other side end plate portion 39, and the heat transfer member 91 and the biasing member 8 are formed.
Since the fitting load is smaller than the biasing force of 9,
The protrusion 68 moves relatively easily toward the front, and a large load is prevented from acting on the protrusion 68.

In this embodiment, a large load is surely prevented from acting on the protruding 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.

Further, in this embodiment, since the spacer 63 made of aluminum having a good thermal conductivity is arranged with the ignition powder 64 containing the explosive for auto ignition which is ignited at a low temperature of 180 ° C., for example, the vehicle fire occurs. At times, the heat from the one end plate portion 37 on the igniter 85 side is efficiently transmitted to the spacer 63, and the autoignition explosive is ignited, so that the gas generating device for airbag deployment may be destroyed in the event of a vehicle fire. This can be eliminated reliably.

FIG. 7 shows the details of the essential parts of another embodiment of the gas generator for deploying an air bag according to the present invention. In this embodiment, the protruding portion 68A is formed on the other end plate portion 39. The recess 97 is inserted into the recess 97 with a predetermined gap L provided on the bottom surface of the recess 97.

The fitting load of the protrusion 68 into the recess 97 is smaller than the biasing force of the biasing member 89. In the air bag deployment gas generator of this embodiment, the device is placed in a high temperature environment such as a fire and the other side end plate portion 39.
When the temperature of the other side end plate portion 39 increases,
Is directly transmitted to the ignition powder 66 housed in the protruding portion 68A, the ignition powder 66 is ignited at a temperature sufficiently lower than the ignition temperature of the gas generant 57, and the gas generant 57 is thereby burned, The risk of causing a rupture of the container or the like under a high temperature environment can be significantly reduced as compared with the conventional case.

Further, the urging member 89 is used to form the cylindrical pack 53.
Since one side end surface 59 of the igniter 85 is pressed toward the one side end plate portion 37 in which the igniter 85 is housed, the interval between the igniter 64 and the igniter 85 arranged on one side of the tubular pack 53 is reduced. It can be maintained reliably.

Further, since the protruding portion 68A is fitted in the recess 97 formed in the other end plate portion 39 with a fitting load smaller than the biasing force of the biasing member 89, the one end plate portion 37 is shaped like an outer cylinder. When the caulking process is performed toward the tubular pack 53 side by the open end portion 79 of the member 35, the tubular pack 53 causes the other side end plate portion 39.
Even after moving to the side, the urging member 8
9, the one end surface 59 of the tubular pack 53 is moved to the igniter 8
5 is moved and pressed toward the one side end plate portion 37 in which the caulking 5 is accommodated, the caulking process can be reliably performed.

In the embodiment described above, the biasing member 8
Although the example in which 9 is formed by the coil spring has been described, the present invention is not limited to such an example, and it goes without saying that it may be formed by a cushion material made of resin or the like.

[0046]

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. Heat is transferred to the igniting agent contained in the protruding section through the heat transfer member fitted to the protruding section of the tubular pack or directly from the recessed section, and the igniting agent is sufficiently higher than the ignition temperature of the gas generating agent. Since the gas generating agent is ignited at a very low temperature, and the gas generating agent is burned by this, 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 biasing 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 The distance from the igniter can be reliably maintained.

Further, in the air bag deployment gas generator of the present invention, the heat transfer member is fitted to the projecting portion with a fitting load smaller than the biasing force of the biasing member, or the projecting portion is fitted to the other end plate portion. Since it was fitted into the recess formed in the concave portion with a fitting load smaller than the biasing force of the biasing member, when the one end plate is caulked toward the tubular pack side by the open end of the tubular member, Even if the shaped pack moves to the other end plate side, one end face of the tubular pack is
Since the igniter is moved and pressed toward the one side end plate portion, there is an advantage 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 cross-sectional view showing another embodiment of the gas generator for deploying an airbag of the present invention.

FIG. 8 is a vertical cross-sectional view showing a gas generating device for deploying an airbag, which the applicant of the present invention previously applied.

[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 89 biasing member 91 heat transfer member 97 recess

Claims (2)

[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,
Further, a gas generant pack in which an igniting agent is arranged near the one end face, an igniter arranged in one end plate part of the tubular member, and another end plate part of the tubular member. And an urging member arranged to urge the tubular pack toward the igniter side, the one end plate portion being an opening of the tubular member. The end portion is fixed by crimping toward the side of the tubular pack, and the other end surface of the tubular pack is provided with a projecting portion for accommodating the ignition powder, and a predetermined gap is provided with respect to the other end plate portion. And a heat transfer member that is pressed against the other end plate by the biasing member is fitted to the protrusion with a fitting load smaller than the biasing force of the biasing member. A gas generator for airbag deployment. 2. An elongated tubular member whose both ends are sealed by one end plate portion and the other end plate portion, 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,
Further, a gas generant pack in which an igniting agent is arranged near the one end face, an igniter arranged in one end plate part of the tubular member, and another end plate part of the tubular member. And an urging member which is disposed between the tubular pack and the other end surface of the tubular pack and urges the tubular pack toward the igniter side, and the one end plate portion is provided with an opening of the tubular member. While caulking and fixing toward the side of the tubular pack by the end portion, on the other end surface of the tubular pack, a protruding portion for accommodating the ignition powder is formed, and this protruding portion is attached to the other side end plate portion. A gas generating device for airbag deployment, characterized in that the formed recess is fitted with a fitting load smaller than the urging force of the urging member in a state where a predetermined gap is provided with respect to the bottom surface of the dent. .