JP2598815B2 - Gas generating agent pack of gas generator for air bag deployment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an airbag deployment used for deploying an airbag such as an air bag, a lifesaving bag, a rubber boat, and an escape chute for a collision safety device by using gas. More particularly, the present invention relates to a gas generating agent storage structure.

[Conventional technology]

Conventionally, in a passenger car, a collision safety device for protecting a driver from a shock at the time of the collision includes, for example, an airbag having a volume of 60 liters and an airbag deployment gas for deploying the airbag with gas. When a passenger car collides, a gas generating agent composed of explosives or a similar composition filled in the air bag deploying gas generating device is ignited and burned, and the air bag is generated by the generated gas. It deploys instantaneously to protect the driver from collisions and prevent serious injury to the driver.

FIG. 7 shows a conventional gas generator for deploying an air bag disclosed in Japanese Patent Application Laid-Open No. 55-110652. In the figure, reference numeral 11 denotes a large number of pellet-shaped gas generating agents 13 which are accommodated. 2 shows a combustion chamber.

In the center of the combustion chamber 11, an igniter 15 and an ignition charge 17 for burning the gas generating agent 13 are arranged.
A combustion chamber filter 19 is arranged along the inner periphery of the combustion chamber 11.

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

In the charging chamber 21, a charging chamber filter 23 is accommodated, and in the charging chamber 21, a charging chamber filter 23 is provided.
A gas outlet 25 for discharging the gas passing through the airbag to the airbag is provided.

In such a gas generator for airbag deployment, when electricity is supplied to the igniter 15, the igniting agent 17 burns, and the combustion causes the gas generating agent 13 to burn. After flowing through the combustion chamber filter 19 arranged along the inner periphery of the combustion chamber 11 and flowing into the charging chamber 21, it is purified by the charging chamber filter 23 and flows into the airbag through the gas outlet 25. Then, for example, the airbag is sufficiently inflated in a short time of about 0.04 seconds.

[Problems to be solved by the invention]

However, in such a conventional gas generator for deploying an air bag, a through hole 29 is formed in the cartridge 27 that contains the gas generating agent 13 in the combustion chamber 11, and the through hole 29 is formed.
Since the plug 31 for supporting the igniter 15 is inserted and fixed in the cartridge 27, there is a problem 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 incorporated in a steering wheel of an automobile or the like, when the gas generating agent 13 becomes humid, the gas generator for deploying the air bag does not operate normally in a collision accident or the like. Therefore, there is a strong demand that the gas generating agent 13 and the igniting agent 17 be securely sealed.

An object of the present invention is to solve the above-mentioned problems and to provide a gas generating agent pack for a gas generator for deploying an air bag, which can reliably seal a gas generating agent and an igniting agent.

[Means for solving the problem]

The gas generating agent pack of the gas generator for deploying an air bag of the present invention comprises a plurality of gas generating agents formed and laminated in an annular plate shape having a through hole at the center, and magnesium and tetrafluoroethylene. An igniting agent filled by coagulation treatment with ethylene fluoride as a binder, and a sealed container including a bottomed cup containing a plurality of gas generating agents and the igniting agent and a cap having a recess formed in the center. The cap is inserted into the bottomed cup and the surface to be polymerized is sealed by bonding or welding to seal, and the concave portion of the cap is depressed toward the through hole side of the gas generating agent to form the accommodating portion of the igniter. It is a feature.

(Operation)

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

In addition, since the concave portion for receiving the igniter is formed in the center of the sealed container so as to be depressed toward the through hole of the gas generating agent, the igniter can be easily arranged adjacent to the igniting agent. Becomes

Furthermore, since the ignition agent obtained by coagulating magnesium and ethylene tetrafluoride with a binder of ethylene trifluoride chloride is cotton-like, it is possible to directly fill the through hole of the gas generating agent.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 show details of a gas generating agent pack of the gas generator for developing an air bag of FIG. 3, and FIG. 3 shows gas generation of the gas generating device for developing an air bag of the present invention. 1 shows an airbag deployment gas generator provided with an embodiment of an agent pack.

In FIG. 3, reference numeral 41 denotes a combustion chamber in which the gas generating agent 43 is stored.

In the center of the combustion chamber 41, an igniter 45 and an ignition charge 47 for burning the gas generating agent 43 are arranged.
A combustion chamber filter 49 is arranged along the inner periphery of the combustion chamber 41.

A charge chamber 51 surrounding the combustion chamber 41 and into which gas that has passed through the combustion chamber filter 49 flows is arranged in an annular shape.

In the charging chamber 51, a charging chamber filter including an upper filter 53 and a gas filtration filter 55 is accommodated. Further, in the charging chamber 51, a gas outlet 57 for discharging the gas that has passed through the gas filtration filter 55 to the airbag is disposed.

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

As shown in FIGS. 4 and 5, the housing body 59 has a bottomed cylindrical portion 61 and a flange portion 67 integrally formed outwardly with an opening of the bottomed cylindrical portion 61. From the outer periphery of the flange portion 67 to the bottom portion 69 of the housing body 59.
And an outer cylindrical portion 71 bent toward the side.

A second flange portion 73 is formed integrally at the tip of the outer cylindrical portion 71 toward the outside.
A mounting hole 75 for mounting an airbag is formed.

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

In this embodiment, as shown in FIG. 6, the covering member 77 has an L-shaped cross section, and one end is inserted into the inside of the outer cylindrical portion 71 of the housing body 59, and the other end is inserted. The inner periphery of the bent portion 81 formed on the housing body 59 is in contact with the outer periphery of the bottomed cylindrical portion 61 of the housing body 59.

The bottomed cylindrical portion 61 of the housing body 59 is formed with a predetermined angle, for example, 18 orifices 82 are formed, and the covering member 77 is formed with a predetermined angle, for example. , 18 gas outlets 57 are formed.

Further, in this embodiment, the housing body 59, the lid member 65
The cover member 77 is formed of stainless steel.

Each gas generating agent 43 arranged in the combustion chamber 41 is formed in an annular plate shape having a through hole 44 formed at the center.

And each gas generating agent 43, in order to improve the ignitability,
Arc-shaped chamfers on the inner and outer circumferences of the gas generating agent 43
46 are formed with a flat shape between them.

The gas generating agent 43 is, for example,
It contains 28% by weight of iron oxide, 28% by weight of iron oxide, 8% by weight of potassium perchlorate, and 2% by weight of solder glass. For example, 18 grams of granules having these compositions are weighed and formed into an annular mold. Fill and press mold with pressure of 40-60 tons.

For example, five of these gas generating agents 43 are stacked, and an igniting agent 47 is disposed in a through hole 44 formed at the center.

Further, a separator 83 is arranged between the gas generating agents 43.

These separators 83 are, for example, stainless steel 20
It is made of an annular wire mesh using # 30 wire, which improves the ignitability of the gas generating agent 43 and enables the gas generating agent 43 to have an exhaust passage.

Thus, in this embodiment, these gas generating agents 43,
The separator 83, the igniting agent 47, and the combustion chamber filter 49 are provided with a first element to prevent the gas generating agent 43 and the igniting agent 47 from absorbing moisture.
As shown in FIG. 2 and FIG. 2, they are integrated as a gas generating agent pack 84.

That is, these members 43, 83, 47, and 49 are a sealed container comprising an upper lid (cap) 86 and a lower lid (cup with a bottom) 87.
Housed in 85.

This sealed container 85 is made of flame-retardant thermoplastic,
For example, polypropylene, nylon with glass fiber, polycarbonate, polyacetal, polysulfone, polyethylene terephthalate, etc. and flame-retardant thermosetting resin,
For example, it is made of epoxy, phenolic resin, polyphenyl sulfide or aluminum.
Sealed by ultrasonic bonding or hot melt welding in the state of being inserted into 87. In this case, the aluminum is sealed by winding, bonding or electron beam welding.

At the center of the upper lid 86 of the sealed container 85, a concave portion 88 which is depressed toward the through hole 44 of the gas generating agent 43 and accommodates the igniter 45 is formed.

In the center of the gas generating agent 43 accommodated in the sealed container 85,
The ignition charge 47 is filled, and in this embodiment, the ignition charge 47 is filled.
Is formed by coagulating magnesium and ethynylene tetrafluoride (Teflon) with a binder of ethylene trifluoride chloride.

The igniting powder 47 is, for example, a felt-like flocculent igniting powder composed of 60% by weight of magnesium and 40% by weight of Teflon. For example, when 1.1 g of the igniting powder is used, the calorific value is 1940.
Calorie / g, gas generation amount is 41cc / g, conventional boron-
The calorific value of the potassium nitrate igniting agent is 1790 calories / g, and the gas generation amount is 79 cc / g. In addition, performance with no time delay can be obtained.

That is, in this embodiment, since the gas generating agent 43 has a ring shape, if the same ignition method as that of the conventional air bag developing gas generating device shown in FIG.
Is destroyed, easy to cause abnormal combustion, and, even when it does not lead to destruction, the ignitability varied, but in this embodiment, magnesium was directly agglomerated with Teflon at the center of the gas generating agent 43. Since the formed ignition charge 47 is filled, the risk of destruction of the gas generating agent 43 can be reliably eliminated.

A combustion chamber filter (first filter) 49 is arranged in the sealed container 85 so as to surround the gas generating agent 43.

This combustion chamber filter 49 has a mesh size of 10
It is configured by winding a stainless steel mesh of No. 35 to around a gas generating agent, and has the following functions.

A function of lowering the combustion gas temperature of the gas generating agent 43 and facilitating capture of combustion products by a filter.

A function that acts as a buffer against vibration and shock. That is, if the gas generating agent 43 is cracked, the surface area of the gas generating agent 43 increases, and abnormal combustion occurs.However, this combustion chamber filter 49 is used until the gas generating device for deploying an air bag is incorporated into a passenger car or the like. In this case, the gas generating agent 43 is prevented from being cracked due to a fall accident at or in a long-term vibration after being mounted on a passenger car.

Capture function of combustion products.

The function of retaining the gas generating agent 43 and securing the combustion gas discharge path. If there is no discharge path, the inside of the housing will be at a high pressure and may be broken.

The inside of the air charge chamber 51 is vertically divided by a partition plate 89, and an upper filter (second filter) 53 is provided above the partition plate 89, and a gas filtration filter (third filter) 55 is provided below the partition plate 89. Are located.

The partition plate 89 is made of, for example, a member such as stainless steel or aluminum, and is pressed into the inner peripheral surface of the covering member 7.
The partition plate 89 passes through the combustion chamber filter 49 and passes through the charging chamber 51.
After the combustion gas flowing into the inside flows into the upper filter 53, the flow of the combustion gas is changed, and the gas filtration filter 55
Acts to lead to.

The upper filter 53 is disposed opposite to the orifice 82 formed in the housing body 59, and is formed by, for example, press-molding a stainless steel demister wire mesh using a ring-shaped mold. The upper filter 53 has a function of making the high-velocity combustion gas turbulent by causing the high-velocity combustion gas ejected from the orifice 82 to collide with the slag screen, thereby adhering the combustion gas residue to the wire mesh.

The gas filtration filter 55 has a function of cooling combustion gas to such an extent that the airbag does not burn, removing combustion residues contained in the combustion gas, and supplying only harmless nitrogen gas to the airbag. It is formed by laminating a fine wire mesh, a woven wire mesh, a sintered metal fiber cloth, an inorganic fiber sheet, a sintered metal fiber cloth, a folded woven wire mesh, and a fine wire mesh in layers from the inner side.

Here, the fine wire mesh is formed, for example, by winding a stainless steel wire mesh of No. 20 to 30 into a tubular shape a plurality of times, and is necessary to appropriately inflate the airbag by cooling the combustion gas. It acts to adjust the amount of gas.

The woven woven wire mesh is made of, for example, a stainless steel wire mesh, and is wound around the outer periphery of the fine wire mesh, and acts to disperse the gas into a turbulent flow.

The inorganic fibrous sheet is wound around the outer surface of the woven woven wire mesh through the sintered metal fiber cloth, contained in the gas, and acts to filter the fine powder of sodium oxide and sodium metal which causes the irritating odor. .

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

The metal fiber sintered cloth is formed by compressing and sintering a stainless wire having a wire diameter of 4 to 8 μm to a thickness of 0.2 to 1.0 mm using 500 g / m ^2. And the porosity is 65-90%.

Further, packings 91 are arranged above and below the gas filtration filter 55 in order to prevent gas leakage from the gas filtration filter 55.

The packing 91 is made of a heat-resistant and flame-retardant material such as silicon rubber to prevent burning, and has a thickness of 0.6 to 2.0 mm.

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

In the airbag deployment gas generator configured as described above, when electricity is supplied to the igniter 45, the igniter 47 burns, and by this combustion, the gas generating agent 43 burns. The gas of 43 passes through the combustion chamber filter 49 arranged along the inner periphery of the combustion substance 41 and flows into the charging chamber 51,
After flowing into the upper filter 53, colliding with the partition plate 89 and inverting, the gas is filtered by the gas filtration filter 55, and the gas outlet 57
And flows into the airbag, and the airbag is sufficiently inflated in a short time of, for example, about 0.04 seconds.

However, in the gas generating agent pack 84 of the air bag developing gas generator configured as follows, a through hole is provided at the center.
Since five annular plate-shaped gas generating agents 43 formed with 44 are stacked and the igniting agent 47 is accommodated in the through hole 44, and these gas generating agents 43 are surrounded by the sealed container 85, The generator 43 and the igniter 47 are securely sealed with a simple structure.

That is, unlike the related art, it is not necessary to form a through hole for inserting and fixing a plug in a cartridge containing a gas generating agent, so that the gas generating agent 43 and the igniting agent 47 are securely sealed with a simple structure. It is possible to do.

Further, in the gas generating agent pack 84 of this embodiment, since the concave portion 88 for accommodating the igniter 45 is formed in the center of the sealed container 85 so as to be depressed toward the through hole 44 of the gas generating agent 43,
It becomes possible to arrange the igniter 45 easily and reliably adjacent to 47.

Further, in the gas generating agent pack 84 of this embodiment, since the flocculant 47 obtained by coagulating magnesium and ethylene tetrafluoride with ethylene trifluoride chloride as a binder was used, the gas generating agent 43 penetrated. DC charging of the igniting agent 47 into the hole 44 becomes possible.

In the above-described embodiment, the example in which the arc-shaped chamfered portion 46 is formed on the inner peripheral portion and the outer peripheral portion of the gas generating agent 43 has been described, but the present invention is not limited to such an embodiment. For example, it is a matter of course that the inner peripheral portion and the outer peripheral portion may be thin and the space between them may be thick.

Further, in the above-described embodiment, the example in which the gas generating agent 43 is formed in an annular shape and five of them are stacked is described.
The present invention is not limited to such an embodiment. For example, if necessary, it may be divided into two to four at a predetermined angle from the center, and one to eight sheets may be overlapped.

Further, in the above-described embodiment, an example in which the combustion chamber filter 49 is accommodated in the sealed container 85 has been described. However, the present invention is not limited to such an embodiment, and the sealed container 95 is not limited thereto.
Needless to say, the combustion chamber filter 49 may be provided outside.

〔The invention's effect〕

As described above, according to the first aspect of the present invention, a plurality of gas generating agents formed and laminated in an annular plate shape having a through hole in the center and magnesium and ethylene tetrafluoride are formed. An ignition charge filled by coagulation treatment with a binder as a binder, a closed container including a bottomed cup containing a plurality of gas generating agents and the ignition charge and a cap having a recess formed in the center, a cap Into a cup with a bottom and glue or weld the surface to be polymerized and sealed,
Since the concave portion of the cap is depressed toward the through hole side of the gas generating agent to form the accommodating portion of the igniter, the gas generating agent and the igniting agent can be securely sealed with a simple structure.

In addition, since the concave portion for accommodating the igniter is formed at the center of the sealed container, the igniter can be easily and reliably arranged adjacent to the igniter. Becomes

Furthermore, since a felt-like igniting agent obtained by coagulating magnesium with Teflon is used as the igniting agent, there is an advantage that it is easy to directly fill the through-hole of the gas generating agent with the igniting agent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the gas generating agent pack of FIG. FIG. 2 is a cross-sectional view of the gas generating agent pack of FIG. 1 along the line II-II. FIG. 3 is a longitudinal sectional view showing an airbag developing gas generator provided with an embodiment of the gas generating agent pack of the airbag developing gas generator of the present invention. FIG. 4 is a longitudinal sectional view showing the housing body of FIG. FIG. 5 is a top view of the housing main body of FIG. FIG. 6 is a longitudinal sectional view showing the covering member of FIG. FIG. 7 is a longitudinal sectional view showing a conventional gas generator for deploying an air bag. [Description of Signs of Main Parts] 41: Combustion chamber 43: Gas generating agent 44: Through hole 45: Igniter 47: Igniter 49: Combustion chamber filter 51: Charging chamber 57: Gas outlet 59 ... Housing body 61 ... Bottom cylindrical part 77 ... Cover member 84 ... Gas generating agent pack 85 ... Sealed container 88 ... Recess.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Koichi Uechi, 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Masaaki Kawaguchi 1-4-1, Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (56) References JP-A-51-125678 (JP, A) JP-A-55-110642 (JP, A) JP-A-50-137739 (JP, U) JP-A 1-145867 (JP, U)

Claims (1)

(57) [Claims] An agglomeration treatment of a plurality of gas generating agents formed and laminated in an annular plate shape having a through hole in the center, and magnesium and ethylene tetrafluoride using ethylene trifluoride as a binder. It has a filled igniting agent, a closed container consisting of a bottomed cup for accommodating a plurality of gas generating agents and the igniting agent, and a cap having a recess formed in the center. A gas generating agent pack for deploying an air bag, characterized in that the surface to be sealed is sealed by welding or welding, and the recess of the cap is depressed toward the through hole of the gas generating agent to form an accommodating portion for the igniter.