JPH04345555A - Air bag inflating gas generating device - Google Patents

Abstract

PURPOSE:To surely purify combustion gas with the whole final filters by arranging cylindrical final filters inside a lengthy cylindrical member formed with gas outflow ports on one side of the outside, and forming gas guide holes on the opposite side of the gas outflow ports on a gas guide member arranged inside the final filters. CONSTITUTION:Many side outflow ports 57 are formed on the upper side of the outer circumference of a cylindrical member 55, and cylindrical final filters 59 are arranged inside the cylindrical member 55. The final filters 59 are partitioned with a partition member 61 fixed on the inner face of the cylindrical member 55, on the inside combustion chambers 65,67 receiving gas generating agent are respectively formed, and a communicating hole 69 is formed on the center of the partition member 61. The contour of the combustion chambers 65,67 are formed out of bottomed cylinder shaped gas guide members 71 and cover members 73, and gas guide holes 79 are formed on the gas guide members 71 at the position opposite to the gas outflow ports 57.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag deployment gas generator used to deploy air bags for collision safety devices, life bags, rubber boats, escape chutes, etc. using combustion gas.

0002

BACKGROUND OF THE INVENTION Conventionally, collision safety devices for passenger cars to protect drivers from shocks in the event of a collision include, for example, an airbag with a capacity of 60 liters and a device for deploying the airbag using gas. It consists of a gas generator for deploying an airbag, and in the event of a collision of a passenger car, explosives filled in the gas generator for deploying the airbag,
Alternatively, a gas generating agent made of a similar composition is ignited and burned, and the generated gas instantly deploys an airbag to protect the driver from a collision and prevent serious injury to the driver. .

FIG. 6 shows a conventional airbag deployment gas generator disclosed in Japanese Patent Application Laid-Open No. 2-155857. In the figure, reference numeral 11 indicates a plurality of gas generating agents 13
This shows the combustion chamber in which the combustion chambers are housed in a stacked manner. The gas generating agent 13 has an annular plate shape with a through hole 15 formed in the center, and an ignition charge 17 is accommodated in the through hole 15 .

These gas generating agents 13 are stored in a sealed container 19.
A recess 21 is formed in the center of the sealed container 19 and is recessed 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 this recess 21 .

A combustion chamber filter 25 is disposed along the inner periphery of the combustion chamber 11, and a filling chamber 27 surrounds the combustion chamber 11 and into which the gas that has passed through the combustion chamber filter 25 flows through an orifice 26. are arranged in a ring. Inside the air chamber 27, an air chamber filter consisting of an upper filter 29 and a gas filtration filter 31 is housed.

[0006] Furthermore, a gas outlet 33 is formed in the air filling chamber 27 for allowing the gas that has passed through the gas filtration filter 31 to flow out to the air bag. In such an airbag deployment gas generator, when electricity is applied to the igniter 23, the igniter 17 is combusted by combustion of the gunpowder in the igniter 23, and this combustion causes the gas generating agent 13 to be combusted. After the gas from the gas generating agent 13 passes through the combustion chamber filter 19 arranged along the inner circumference of the combustion chamber 11 and flows into the filling chamber 27, it is purified by the upper filter 29 and the gas filtration filter 31. The gas flows into the airbag through the gas outlet 33, and the airbag is fully inflated in a short time of, for example, about 0.04 seconds.

However, such a conventional airbag deployment gas generator has a problem in that the capacity of the gas generating agent 13 for combustion gas is limited, and the combustion gas purification performance is also limited. Ta. In other words, especially when used to deploy the passenger seat airbag, the passenger seat has a different riding environment than the driver's seat, and the posture of the passenger is not constant.
In addition, there are cases where children are seated, and the physical differences between occupants are large, so for example, the conventional airbag for the driver's seat has a
An airbag with twice as large capacity is required, and therefore, there is a need for a gas generator for deploying an airbag that has a large combustion gas capacity and can reliably purify this large volume of combustion gas. It had been.

[0008] The present applicant has previously developed a gas generator for deploying an air bag that solves the conventional problems.
A patent application was filed on October 8th. As shown in FIG. 7, this airbag deployment gas generator includes a long cylindrical member 41 on both sides of which a gas outlet 39 is formed in an intermediate portion 37.
The combustion chamber 45 in which the gas generating agent 43 is housed is separated by the partition member 4.
7, and the intermediate portion 37 of the cylindrical member 41
A cylindrical final filter 49 is arranged inside the cylindrical member 4.
An intermediate filter 51 is disposed between the final filter 49 inside the filter 1 and the partition member 47, and an orifice 53 is opened at a position on the side of the intermediate filter 51 of the partition member 47.

[0009] According to this airbag deployment gas generator, the combustion gas capacity of the gas generating agent 43 can be greatly increased compared to the conventional one, and a large volume of combustion gas can be reliably purified. , furthermore, gas generating agent 4
3 combustion can be easily adjusted. On the other hand, in such an airbag deployment gas generator, from the viewpoint of attachability to the airbag, the gas outlet 39 is formed only on one side of the outer periphery of the cylindrical member 41, and only from this gas outlet 39 is the gas outlet 39 formed. There is a desire to supply combustion gas to airbags.

0010

[Problems to be Solved by the Invention] However, in this way, the gas outlet 39 is located only on one side of the outer periphery of the cylindrical member 41.
, the combustion gas passes only through the final filter 49 on the gas outlet 39 side, and the final filter 49 on the opposite side to the gas outlet 39 is hardly used.
There was a problem in that the combustion gas purification performance of the final filter 49 deteriorated.

The present invention solves the above-mentioned problems, and even when the gas outlet is formed only on one side of the outer periphery of the cylindrical member, the entire final filter can reliably purify the combustion gas. It is an object of the present invention to provide a gas generating device for airbag deployment that is capable of deploying an airbag.

0012

[Means for Solving the Problems] A gas generator for deploying an airbag according to the present invention includes a final cylindrical filter inside a long cylindrical member having a gas outlet formed on one side of its outer periphery. At the same time, a cylindrical gas guide member is disposed inside the final filter, and a gas guide hole is formed in the gas guide member at a position opposite to the gas outlet.

[0013]

[Operation] In the gas generator for airbag deployment of the present invention,
When the gas generating agent burns in the combustion chamber, the combustion gas in the combustion chamber flows into the gas guide member, and then flows through the gas guide hole of the gas guide member to the side opposite to the gas outlet of the final filter, After passing through the final half of the filter, it flows out from the gas outlet to the airbag side.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be explained with reference to embodiments shown in the drawings. 1, 2, and 3 show an embodiment of the airbag deployment gas generator of the present invention, and in the figures, reference numeral 55 indicates an elongated cylindrical member. A large number of gas outlet ports 57 are formed on the upper side of the outer periphery of this cylindrical member 55 .

The gas outlet ports 57 are formed perpendicularly to the axial direction of the cylindrical member 55 at predetermined intervals, and their lengths are, for example, about 50 degrees from the center of the cylindrical member 55. It is formed to have an angle θ of . Cylindrical member 55
A cylindrical final filter 59 is arranged inside. This final filter 59 is configured by, for example, winding fine wire mesh, folded wire mesh, etc. in layers, and cools the combustion gas to the extent that the airbag will not burn out, and also removes combustion residues contained in the combustion gas. It has the function of supplying only harmless nitrogen gas to the airbag.

This final filter 59 is partitioned by a partition member 61 fixed to the inner surface of the cylindrical member 55, and inside the final filter 59 are a first combustion chamber 65 in which a gas generating agent 63 is accommodated, and A second combustion chamber 67 is formed. Note that the first combustion chamber 6 is located in the center of the partition member 61.
A communication hole 69 is formed to communicate between the combustion chamber 5 and the second combustion chamber 67.

In this embodiment, the first combustion chamber 65
The outer shell of the second combustion chamber 67 is formed by a bottomed cylindrical gas guide member 71 and a lid member 73. Note that an orifice 77 is formed in the bottom portion 75 of the gas guide member 71 at a position corresponding to the communication hole 69 of the partition member 61. Further, the lid member 73 is fixed to both sides of the cylindrical member 55 by caulking.

A gas guide hole 79 is formed in the gas guide member 71 at a position opposite to the gas outlet 57 . Inside the gas guide member 71, a plurality of gas generating agents 63 are arranged in a stacked manner in the axial direction of the gas guide member 71. Each gas generating agent 63 is formed into an annular plate shape with a through hole 81 or 83 formed in the center, and the through hole 83 is filled with an ignition charge 85.

An igniter 87 for igniting the gas generating agent 63 is inserted into the through hole 83 of the gas generating agent 63 on the side of the lid member 73 of the first combustion chamber 65 . A separator 89 is arranged between each gas generating agent 63. These separators 89 are made of, for example, an annular wire mesh made of stainless steel with a mesh of 10 to 45.
This improves the ignitability of the gas generating agent 63, and also makes it possible to secure an exhaust passage for the gas generating agent 63.

Further, a combustion chamber filter 91 is disposed on the inner periphery of the gas guide member 71, and is made of, for example, a wire mesh made of stainless steel with 10 to 35 mesh wrapped around each other. It functions to remove combustion gas residue from the generator 63, cool the combustion gas, and secure an exhaust passage for the combustion gas. In the airbag deployment gas generator configured as described above, when electricity is supplied to the igniter 87 disposed in the first combustion chamber 65, the ignition charge 85 is combusted, and due to this combustion, the gas generating agent 63 is combusted, and the combustion gas flows through the gas guide hole 79 of the gas guide member 71 of the first combustion chamber 65 to the side opposite to the gas outlet 57 of the final filter 59, and passes through half of the final filter 59. In the meantime, the gas is reliably purified by the final filter 59 and flows into the airbag from the gas outlet 57.

On the other hand, the gas generating agent 63 in the first combustion chamber 65
Due to combustion, combustion gas flows through the orifice 77 and the communication hole 6.
9. The ignition charge 85 in the second combustion chamber 67 is guided to the second combustion chamber 67 through the orifice 77, and is combusted after a predetermined period of time has elapsed after the start of combustion of the gas generating agent 63 in the first combustion chamber 65. The gas generating agent 63 in the second combustion chamber 67 is burned after a predetermined period of time has elapsed from the start of combustion of the gas generating agent 63 in the first combustion chamber 65 .

This combustion gas is guided to the gas outlet 57 in the same manner as the combustion gas in the first combustion chamber 65, and is guided to the gas outlet 57.
7, it flows out to the airbag side. In the airbag deployment gas generator configured as described above, a final cylindrical filter 59 is disposed inside the elongated cylindrical member 55 in which the gas outlet 57 is formed on one side of the outer periphery. At the same time, a cylindrical gas guide member 71 is arranged inside this final filter 59, and a gas guide hole 79 is formed at a position opposite to the gas outlet 57 of this gas guide member 71. , the gas outlet 5 is provided only on one side of the outer periphery of the cylindrical member 55.
7 is formed, it is possible to reliably purify the combustion gas with the entire final filter 59.

That is, in the airbag deployment gas generator configured as described above, when the gas generating agent 63 is burned in the combustion chambers 65, 67, the combustion gas in the combustion chambers 65, 67 is transferred to the gas guide member. After that, the gas flows through the gas guide hole 79 of the gas guide member 71 to the side opposite to the gas outlet 57 of the final filter 59, and after passing through half of the final filter 59, the gas flow Since it flows out from the outlet 57 to the airbag side, the entire final filter 59 is effectively used, and the final filter 59
It becomes possible to significantly improve the purification performance compared to the conventional method.

In the airbag deployment gas generator constructed as described above, the gas outlet ports 57 are formed perpendicularly to the axial direction of the cylindrical member 55 at predetermined intervals, and the outflow angle is Since θ is set to an angle of about 50 degrees, for example, it is possible to cause the combustion gas to flow out from the gas outlet 57 very smoothly. 4 and 5 show another embodiment of the present invention, in which the partition member 61
The position is biased toward the first combustion chamber 65 from the center of the cylindrical member 55.

The volume of the first combustion chamber 65 is smaller than the volume of the second combustion chamber 67, for example, about 1/3 of the volume of the second combustion chamber 67. In the airbag deployment gas generator configured in this manner, when electricity is supplied to the igniter 87 disposed in the first combustion chamber 65, the ignition charge 85 is combusted, and as a result of this combustion, the gas generating agent 63 is combusted, and the combustion gas flows through the gas guide member 7 of the first combustion chamber 65.
The gas flows through the gas guide hole 79 of No. 1 to the side opposite to the gas outlet 57 of the final filter 59, and is reliably purified by the final filter 59 while passing through half of the final filter 59.
The gas flows into the airbag from the gas outlet 57.

On the other hand, the gas generating agent 63 in the first combustion chamber 65
Due to combustion, combustion gas flows through the orifice 77 and the communication hole 6.
9. The ignition charge 85 in the second combustion chamber 67 is guided to the second combustion chamber 67 through the orifice 77, and is combusted after a predetermined period of time has elapsed after the start of combustion of the gas generating agent 63 in the first combustion chamber 65. The gas generating agent 63 in the second combustion chamber 67 is burned after a predetermined period of time has elapsed from the start of combustion of the gas generating agent 63 in the first combustion chamber 65 .

This combustion gas is guided to the gas outlet 57 in the same manner as the combustion gas in the first combustion chamber 65, and is guided to the gas outlet 57.
7, it flows out to the airbag side. The airbag deployment gas generator configured as described above can also achieve the same effects as the airbag deployment gas generator shown in FIG.
A cylindrical final filter 59 is disposed inside the elongated cylindrical member 55 formed with 7, and this final filter 59 is partitioned by a partition member 61 having a communication hole 69 formed therein. A first combustion chamber 65 and a second combustion chamber 67 each contain a gas generating agent 63.
The igniter 87 is arranged in the first combustion chamber 65, and the partition member 61 is arranged so as to be biased from the center of the cylindrical member 55 toward the first combustion chamber 65. Since the volume of the combustion chamber 65 is made smaller than the volume of the second combustion chamber 67, the amount of combustion gas flowing into the airbag at the initial stage of airbag deployment can be easily and reliably adjusted.

That is, in the airbag deployment gas generator configured as described above, first, the first
The gas generating agent 63 in the combustion chamber 65 burns, and after a predetermined time elapses, the gas generating agent 63 in the second combustion chamber 67 having a large volume burns.
Since the combustion gas is combusted, it is possible to effectively prevent combustion gas from suddenly flowing into the airbag at the initial stage of the airbag's deployment, and it is possible to effectively alleviate the impact on the occupant.

In the airbag deployment gas generator configured as described above, since the volumes of the first combustion chamber 65 and the second combustion chamber 67 are made different by the partition member 61,
The structure is extremely simple and high reliability can be obtained. Furthermore, by changing the position of the partition member 61, it is possible to easily adjust the amount of combustion gas flowing into the airbag at the initial stage of airbag deployment to an optimal value.

Note that in the embodiments described above, the cylindrical member 5
Although an example has been described in which the first combustion chamber 65 and the second combustion chamber 67 are formed in FIG. Of course. Further, in the embodiment described above, an example was described in which the final filter 59 and the gas guide member 71 were arranged concentrically, but the present invention is not limited to such an embodiment, and the present invention is not limited to such an embodiment. Of course, the gas guide member may be arranged eccentrically.

Furthermore, in the embodiments described above, an example was described in which the combustion chambers 65, 67 were formed inside the final filter 59, but the present invention is not limited to such embodiments, and the present invention is not limited to such embodiments. Of course, combustion chambers may be formed on both sides, and combustion gas from the combustion chambers may flow into the gas guide member.

[0032]

Effects of the Invention As described above, in the airbag deployment gas generator of the present invention, a cylindrical final tube is installed inside a long cylindrical member in which a gas outlet is formed on one side of the outer periphery. In addition to arranging the filter, a cylindrical gas guide member was also arranged inside this final filter, and a gas guide hole was formed at a position opposite to the gas outlet of this gas guide member, so that the cylindrical member Even when the gas outlet is formed only on one side of the outer periphery of the filter, there is an advantage that the entire final filter can reliably purify the combustion gas.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an airbag deployment gas generator of the present invention.

FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a cross-sectional view showing another embodiment of the gas generator for deploying an airbag according to the present invention.

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a longitudinal sectional view showing a conventional airbag deployment gas generator.

FIG. 7 is a longitudinal cross-sectional view showing a gas generator for deploying an airbag, which was previously filed by the present applicant.

[Explanation of symbols]

55 Cylindrical member 57 Gas outlet 59 Final filter 61 Partition member 71 Gas guide member 79 Gas guide hole

Claims (1)

[Claims] Claim 1: A cylindrical final filter is disposed inside a long cylindrical member in which a gas outlet is formed on one side of the outer periphery, and a cylindrical gas guide is disposed inside the final filter. 1. A gas generating device for deploying an air bag, characterized in that a gas guide hole is formed at a position opposite to the gas outlet of the gas guide member.