JPH02155860A - Gas generating agent pack for gas generating device for inflating air bag - Google Patents

Abstract

PURPOSE:To surely seal gas generating agent members and an igniting agent by stacking a plurality of annular board type gas generating agent members having a through holes in the center, housing the igniting agent in the through hole and surrounding the gas generating agent members by means of a sealing container. CONSTITUTION:Gas generating agent members 43, e.g., five sheets in number are stacked and an igniting agent 47 is placed in a through hole 44 formed in the center. The gas generating agent members 43, separators 83, the igniting agent 47 and a combustion chamber are integrally formed as a gas generating agent pack 84 to prevent the gas generating agent members 43 and igniting agent 47 from absorbing moisture. That is, these are housed in a sealing container 85 consisting of a top cover 86 and a bottom cover 87. A recessed portion 88 which is caved in on the through hole 44 side of the gas generating agent members 43 and for housing an ignitor is formed in the center of the top cover 86 of the sealing container 85. Also, the igniting agent 47 which is formed by coagulatingly processing magnesium with Teflon is directly filled in the center of the gas generating agent members 43 to surely prevent the fear of breakage of the gas generating agent member 43.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air bag deployment device used for deploying air bags for collision safety devices, life bag rubber boats, escape chutes, etc. using gas. Related to gas generators,
In particular, it relates to a housing structure for a gas generating agent.

[Conventional technology]

Conventionally, collision safety devices for passenger cars to protect drivers from shocks during collisions include, for example, an airbag with a capacity of 60 liters and an airbag deployment gas for deploying the airbag with gas. In the event of a collision of a passenger car, a gas generating agent made of explosives or a similar composition filled in the airbag deployment gas generator is ignited and burned, and the generated gas is used to deploy the airbag. It deploys instantly to protect the driver from a collision and prevent serious injury to the driver.

FIG. 7 shows a conventional airbag deployment gas generator disclosed in Japanese Unexamined Patent Publication No. 55-110642.
In the figure, reference numeral 11 indicates a combustion chamber in which a large number of pellet-shaped gas generating agents 13 are accommodated.

In the center of this combustion chamber 11, an igniter 15 and an igniter 7 for burning the gas generating agent 13 are arranged.
Further, a combustion chamber filter 19 is arranged along the inner periphery of the combustion chamber 11.

A filling chamber 21 surrounding the combustion chamber 11 and into which gas that has passed through the combustion chamber filter 19 flows is arranged in an annular shape.

An air filling chamber filter 23 is housed in the air filling chamber 21, and a gas flow is provided in the air filling chamber 21 to allow the gas that has passed through the air filling chamber filter 23 to flow out to the air bag. An outlet 25 is located.

In such an airbag deployment gas generator, when electricity is applied to the igniter 15, the ignition charge 17 is combusted, and as a result of this combustion, the gas generating agent 13 is combusted, and the gas of this gas generating agent 13 is , after passing through the combustion chamber filter 19 arranged along the inner circumference of the combustion chamber 11 and flowing into the filling chamber 21,
The gas is purified by the air filling chamber filter 23, flows into the air bag through the gas outlet 25, and the air bag is fully inflated in a short time of, for example, about 0.04 seconds.

[Problems to be Solved by the Invention] However, in such a conventional airbag deployment gas generating device, a through hole 29 is formed in the cartridge 27 that accommodates the gas inhibitor 13 in the combustion chamber 11, and this Since the plug 31 for supporting the igniter 15 is inserted and fixed in the through hole 29, there is a problem in that the sealing mechanism becomes very complicated in order to reliably seal the inside of the cartridge 27.

That is, for example, in a gas generator for deploying an air bag that is incorporated into the steering wheel of a car, if the gas generating agent 13 becomes moist, the gas generator for deploying the air bag will not operate normally in the event of a collision or the like. Because of the hole, it is strongly desired to reliably seal the gas generating agent 13 and the igniter 17.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a gas generating agent bag for an air bag deployment gas generating device that can reliably seal the gas generating agent and the igniter.

[Failure to solve the problem]

The gas generating agent bag of the gas generating device for airbag deployment of the present invention has a plurality of annular plate-shaped gas generating agents stacked with a through hole formed in the center, and ignition powder is accommodated in the through hole, and These gas generating agents are surrounded by a sealed container.

Further, if necessary, a recessed portion is formed in the center of the sealed container to be depressed toward the through-hole side of the gas generating agent and to accommodate the igniter.

Furthermore, the igniter is preferably one obtained by agglomerating magnesium and tetrafluoroethylene using trifluorochloroethylene as a binder.

[For production]

In the gas generating agent bag of the gas generating device for airbag deployment of the present invention, a plurality of annular plate-shaped gas generating agents with a through hole formed in the center are stacked, and the igniter is accommodated in the through hole. Since the gas generating agent is surrounded by a sealed container, the gas generating agent and the igniter can be reliably sealed with a simple structure.

In addition, if necessary, the medium flame in the sealed container is recessed toward the through-hole side of the gas generating agent to accommodate the igniter, making it easy to place the igniter adjacent to the igniter. It becomes possible to do so.

Furthermore, since the igniter, which is obtained by agglomerating magnesium and tetrafluoroethylene using a fluorochloroethylene binder, is flocculent, it can be directly filled into the through-hole of the gas generating agent.

[Example] Hereinafter, an example will be described in which details of the present invention are shown in the drawings.

1 and 2 show details of the gas generating agent bag of the air bag deployment gas generator shown in FIG.
The figure shows an airbag deployment gas generator equipped with an embodiment of the gas generating agent pack of the airbag deployment gas ordering device of the present invention.

In FIG. 3, reference numeral 41 indicates a combustion chamber in which a gas generating agent 43 is accommodated.

In the center of this combustion chamber 41, an igniter 45 and an igniter 47 for burning the gas generating agent 43 are arranged.
Further, a combustion chamber filter 49 is arranged along the inner circumference of the combustion chamber 41.

Further, a filling chamber 51 that surrounds the combustion chamber 41 and into which the gas that has passed through the combustion chamber filter 49 flows is arranged in an annular shape.

Inside the air chamber 51, an air chamber filter consisting of an upper filter 53 and a gas filtration filter 55 is housed. In addition, a gas filtration filter 5 is provided in the air filling chamber 51.
A gas outlet 57 is arranged to allow the gas that has passed through the airbag 5 to flow out to the air bag.

In this embodiment, the combustion chamber 41 is formed by a bottomed cylindrical portion 61 of the housing body 59 and a lid member 65 that is electron beam welded 63 to this opening.

As shown in FIGS. 4 and 5, the housing main body 59 includes a bottomed cylindrical portion 61 and a flange portion 67 integrally formed at the opening of the bottomed cylindrical portion 61 toward the outside.
and the housing body 59 from the outer periphery of this flange portion 67.
It is formed from an outer cylindrical portion 71 that is bent toward the bottom surface portion 69 side.

A second flange portion 73 is integrally formed at the tip of the outer cylindrical portion 71 so as to face outward, and an attachment hole 75 for attaching an air bag is formed in this flange portion 73.

Then, as shown in FIG. 3, the filling chamber 51 is formed by covering the outer cylindrical portion 71 and the bottomed cylindrical portion 61 of the housing body 59 from the bottom surface portion 69 side of the housing body 59 with a scooping member 77, This cover member 77 is welded 79. to the outer cylindrical portion 71 and the bottomed cylindrical portion 61 using an electron beam or a laser beam.
80 by welding and joining.

In this embodiment, as shown in FIG. 6, the cover member 77 has a curved cross section, and the - end is fitted inside the outer cylinder part 71 of the housing main body 59, and the other end is inserted into the outer cylinder part 71 of the housing body 59. The inner periphery of the bent portion 81 formed at the end is in contact with the outer periphery of the bottomed cylindrical portion 61 of the housing body 59 .

Note that, for example, 18 orifices 82 are formed in the bottomed cylindrical portion 61 of the housing body 59 at a predetermined angle, and in the occluded member 77, for example, 18 orifices 82 are formed at a predetermined angle. , 18 gas outlet ports 57 are formed.

Further, in this embodiment, the housing main body 59 lid member 65
and the cover member 77 are each made of stainless steel.

Each gas generating agent 43 disposed within the combustion chamber 41 is formed into an annular plate shape with a through hole 44 formed in the center.

In order to improve the ignitability of each gas generating agent 43,
Arc-shaped chamfered portions 46 are formed on the inner and outer peripheral portions of the gas generating agent 43, and the space between them is flat.

Moreover, this gas generating agent 43 is, for example, agility soda 6
2% by weight, iron oxide 28% by weight, potassium perchlorate 8% by weight,
Containing 2% by weight of solder glass, for example, 18 grams of granules having this composition are weighed, filled into an annular mold, and pressure-molded at a pressure of 40 to 60 tons.

For example, five of these gas generating agents 43 are stacked, and an ignition charge 47 is arranged in a through hole 44 formed in the center.

Moreover, a separate lake 83 is arranged between each gas ordering agent 43.

These separators 83 are made of stainless steel, for example.
It is made of an annular wire mesh made of wire of No. 0 to No. 30, and improves the ignitability of the gas generating agent 43, and also makes it possible to secure an exhaust passage for the gas generating agent 43.

In this embodiment, these gas generating agents 43.
Separator 831 igniter 47 and combustion chamber filter 49
is integrated as a gas generating agent bag 84, as shown in FIGS. 1 and 2, in order to prevent the gas generating agent 43 and the ignition powder 47 from absorbing moisture.

In other words, these members 43.83.47.49 are above! (It is housed in a sealed container 85 consisting of a lid 86 and a lower lid 87.

This sealed container 85 is made of flame-retardant thermoplastic plastic.
For example, polypropylene, glass-filled nylon, polycarbonate, polyacetal.

It is made of polysarpon, polyethylene terephthalate, etc. and a flame-retardant thermosetting resin, such as epoxy, phenol resin, polyphenyl sulfide, or aluminum, and is sealed by ultrasonic bonding or hot melt welding with the upper cover 86 inserted into the lower cover 87. has been done. In this case, the aluminum is sealed by crimping, gluing or electron beam welding.

A recess 88 is formed in the center of the upper lid 86 of the sealed container 85, which is recessed toward the through hole 44 side of the gas generating agent 43 and for accommodating the igniter 45.

The center of the gas generating agent 43 housed in the sealed container 85 is filled with an ignition charge 47. In this embodiment, the ignition charge 47 is composed of magnesila J and tetrafluoroethylene (Teflon). It is formed by agglomeration treatment using a fluorochlorinated ethylene binder.

This ignition powder 47 is, for example, 60% by weight of magnesium,
It is a flocculent ignition powder made of 40% Teflon, and for example, when 1.1g of ignition powder is used, the calorific value is 1940 lorries/g and the amount of gas generated is 41cc/g.
The calorific value of the conventional boron-potassium nitrate igniter is 1
790 calories/g and gas generation rate of 79cc/g, the calorific value is high and the gas generation rate is low, so the gas generating agent 43 does not break due to impact pressure and impact heating, and has the ability to have no time delay. can be obtained.

That is, in this embodiment, since the gas generating agent 43 has an annular shape, if the same ignition method as in the conventional air bank deployment gas generator shown in FIG. 7 is used, the gas generating agent 4
3 was destroyed, causing abnormal combustion] 1. Even when destruction did not occur, there were variations in ignitability, but in this example, gas generating agent 4
Since magnesium is directly agglomerated with Teflon at the center and filled with igniter 47, the possibility of destruction of gas generating agent 43 can be reliably eliminated.

A combustion chamber filter (first filter) 49 is disposed in the sealed container 85, surrounding the gas generating agent 43.

This combustion chamber filter 49 has a mesh size of 1, for example.
It is constructed by winding a stainless wire mesh of No. 0 to No. 35 around the gas generating agent, and has the following functions.

■A function of lowering the combustion gas temperature of the gas generating agent 43 and making it easier to capture combustion products by the filter.

■A function that acts as a buffer against vibration and shock. In other words, when the gas generating agent 43 cracks, the surface area of the gas generating agent 43 increases and abnormal combustion occurs. This prevents the gas generating agent 43 from cracking due to a falling accident during the installation or due to long-term vibration after being installed in a passenger car.

■Function to capture combustion products.

■Function for holding the gas generating agent 43 and securing a combustion gas exhaust route. If there is no discharge path, there is a risk of high pressure inside the housing and destruction.

The inside of the air chamber 51 is divided into upper and lower parts by a partition plate 89, and the -L part filter (second filter) 53 is placed above the partition plate 89, and the gas filtration filter (third filter) is placed below the partition plate 89. 55 are arranged.

The partition plate 89 is made of, for example, stainless steel or aluminum, and is press-fitted into the inner peripheral surface of the cover member 77. This partition plate 89 has the function of changing the flow of combustion gas that has passed through the combustion chamber filter 49 and flowed into the filling chamber 51 into the upper filter 53, and guiding it to the gas filtration filter 55. do.

The upper filter 53 is disposed opposite to the orifice 82 formed in the housing body 59, and is formed, for example, by press-molding a stainless steel demister wire mesh using a ring-shaped mold.

The upper filter 53 has the function of making the high-flow combustion gas ejected from the orifice 82 collide with the slag screen, thereby making the high-flow combustion gas a turbulent flow, and causing combustion gas residue to adhere to the wire mesh.

The gas filtration filter 55 has the function of cooling the combustion gas to the extent that the airbag will not burn out, removing combustion residue contained in the combustion gas, and supplying only harmless nitrogen gas to the airbag. It is formed by winding, in order from the inside, five fold-woven wire meshes, a metal fiber sintered cloth, an inorganic fiber sheet metal fiber sintered cloth, two fold-woven wire meshes, and a fine wire mesh.

Here, the fine wire mesh is composed of, for example, a stainless steel wire mesh of No. 20 to 30 wound several times in a cylindrical shape, and is necessary for appropriately inflating the airbag by cooling the combustion gas. It acts to adjust the amount of gas.

The folded woven wire mesh is made of, for example, stainless steel wire mesh, and is wound around the outer periphery of the fine wire mesh to have the effect of making gas turbulent and dispersing it.

The inorganic fibrous sheet is wrapped around the outer circumference of the folded wire mesh through a sintered metal fiber cloth, and has the effect of filtering out fine powders of sodium oxide and thorium metals contained in the gas and causing irritating odors. do.

A metal fiber sintered cloth is wound adjacent to the inside and outside of this inorganic fiber sheet, and this metal fiber sintered cloth and folded woven wire mesh protect the inorganic fiber sheet from being destroyed by the gas flow. It acts to prevent.

The metal fiber sintered cloth is made by, for example, using stainless steel wire with a wire diameter of 4 to 8 micrometers at a rate of 500 g/bo, and compressing and sintering it to a thickness of 0.2 to 1.0 mm. The porosity is 65 to 90%.

Further, gas filtration filters 55 are provided with gaskets 9 on the top and bottom to prevent gas leakage from the gas filtration filters 55.
1 is placed.

This gasket 91 is made of a heat-resistant, flame-retardant material such as silicone rubber to prevent burnout, and has a thickness of 0.6 to 2.0 mm.

The igniter 45 is supported by a plug 93 that is screwed into a through hole formed in the center of the lid member 65.
3 is filled with a sealing member 95.

In the airbag deployment gas generator configured as described above, when electricity is supplied to the igniter 45, the ignition charge 47 is combusted, and this combustion causes the gas generating agent 43 to be combusted. The gas No. 43 passes through the combustion chamber filter 49 disposed along the inner circumference of the combustion chamber 41, flows into the filling chamber 51, flows into the upper filter 53, collides with the partition plate 89, and is reversed. Thereafter, the gas is purified by the gas filtration filter 55, flows into the air bag through the gas outlet 57, and the air bag is fully inflated in a short time of, for example, about 0.04 seconds.

Therefore, in the gas generating agent pack 84 of the gas generating device for air bag deployment configured as described above, five gas generating agents 43 in the shape of annular plates each having a through hole 44 formed in the center are stacked and While accommodating the ignition charge 47 in the hole 44,
Since these gas generating agents 43 are surrounded by the sealed container 85, the gas generating agents 43 and the igniter 47 are reliably sealed with a simple structure.

That is, it is no longer necessary to form a through hole for inserting and fixing a plug in the cartridge that accommodates the gas generating agent, as in the conventional case, so the gas generating agent 43 and the igniter 47 can be reliably sealed with a simple structure. It becomes possible to do so.

In addition, in the gas generating agent bag 84 of this embodiment, a recess 88 is formed in the center of the sealed container 85 to sink toward the through hole 44 side of the gas generating agent 43 and to accommodate the igniter 45. It becomes possible to easily and reliably arrange the igniter 45 adjacent to the igniter 47.

Furthermore, in the gas generating agent pack 84 of this embodiment, since the cotton-like igniter 47 was used which was made by agglomerating magnesium and tetrafluoroethylene using trifluorochloroethylene as a binder, the gas generating agent 43 could not penetrate through the gas generating agent pack 84. It becomes possible to fill the ignition powder 47 directly into the hole 44.

In addition, in the embodiment described above, an example was explained in which arc-shaped chamfered portions 46 were formed on the inner and outer peripheral portions of the gas generating agent 43, but the present invention is not limited to such embodiments. For example, it goes without saying that it may be shaped like a drum, with the inner circumferential portion and outer circumferential portion being thinner and the space between them being thicker.

In addition, in the embodiment described above, an example was explained in which the gas generating agent 43 was formed in an annular shape and five sheets of these were stacked.
The present invention is not limited to such embodiments, and of course, if necessary, it may be divided into 2 to 4 pieces at a predetermined angle from the center and stacked in 1 to 8 pieces.

Further, in the embodiments described above, an example was described in which the combustion chamber filter 49 was housed inside the sealed container 85, but the present invention is not limited to such an embodiment, and the combustion chamber filter 49 is housed outside the sealed container 85. Of course, it is also possible to arrange .

〔Effect of the invention〕

As described above, according to the invention of claim 1, a plurality of annular plate-shaped gas generating agents each having a through hole formed in the center are stacked,
Since the igniter is housed in the through hole and these gas generating agents are surrounded by the sealed container, it is possible to reliably seal the gas generating agent and the igniter with a simple structure.

In addition, in the invention of claim 2, in claim 1, a recess is formed in the center of the sealed container to be depressed toward the through-hole side of the gas generating agent and to accommodate the igniter. It becomes possible to easily and reliably arrange the igniter.

Furthermore, in the invention of claim 3, since a felt-like ignition powder made by coagulating magnesium with Teflon is used as the ignition powder in claim 1 or 2, it is not possible to directly fill the ignition powder into the through hole of the gas generating agent. This has the advantage of being easily possible.

one

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the gas generating agent bag shown in FIG. 3. FIG. 2 is a cross-sectional view of the gas generating agent pack shown in FIG. 1 taken along the line ■-■. FIG. 3 is a longitudinal cross-sectional view showing a gas generator for deploying an air bag, which is equipped with an embodiment of the gas generating agent pack for the gas generator for deploying an air bag according to the present invention. 4 is a longitudinal sectional view showing the housing body of FIG. 3. FIG. FIG. 5 is a top view of the housing body of FIG. 3. FIG. 6 is a longitudinal sectional view showing the cover member of FIG. 3. FIG. 7 is a longitudinal sectional view showing a conventional airbag deployment gas generator. [Explanation of symbols of main parts] 41... Combustion chamber 43... Gas generating agent 44... Through hole 45... Igniter 47... Ignition charge 49... Combustion chamber filter 51... - Filling chamber 57... Gas outlet 59... Housing main body 61... Bottomed cylindrical part 77... Obscuring member 84... Gas generating agent pack 85... Sealed container 88...・Concavity.

Claims (3)

[Claims] (1) A plurality of annular plate-shaped gas generating agents each having a through hole formed in the center are stacked, an ignition powder is contained in the through hole, and these gas generating agents are surrounded by a sealed container. A gas generating agent pack for a gas generating device for airbag deployment, characterized by the following. (2) The gas generating agent of the gas generating device for deploying an airbag according to claim 1, wherein a recessed portion is formed in the center of the sealed container to be depressed toward the through-hole side of the gas generating agent and to accommodate an igniter. pack. (3) A gas generating agent pack for a gas generating device for air bag deployment according to claim 1 or 2, wherein the igniter is formed by agglomerating magnesium and tetrafluoroethylene using trifluorochloroethylene as a binder.