JP2505895B2 - Gas generating agent pack of gas generator for air bag deployment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an airbag used for deploying airbags for collision safety devices such as airbags, life bags, rubber boats, escape chutes, etc. by combustion gas. BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a developing gas generator, and more particularly to a structure for containing a gas generating agent.

[Conventional technology]

Conventionally, in a passenger car, a collision safety device for protecting a driver from a shock at the time of a collision is, for example, an airbag having a volume of 60 liters and an airbag deployment gas for deploying the airbag with gas. It is composed of a generator, and at the time of a collision of a passenger vehicle, even ignites and combusts a gas generant consisting of explosives or a similar composition filled in a gas generator for expanding an airbag, and generates an airbag by the generated gas. It deploys instantly to protect the driver from collisions and prevent serious injury to the driver.

FIG. 9 shows a conventional gas generator for deploying an air bag disclosed in Japanese Patent Laid-Open No. 55-110642. In the figure, reference numeral 11 contains a large number of pellet-shaped gas generating agents 13. Shows the 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.

A filling chamber filter 23 is housed in the filling chamber 21, and the filling chamber filter 23 is provided in the filling chamber 21.
A gas outlet 25 for arranging the gas that has passed through to the air bag is arranged.

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 0.06 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 an airbag deployment gas generator incorporated in a steering wheel of an automobile or the like, if the gas generating agent 13 has moisture, the airbag deployment gas generator does not operate normally in a collision accident or the like. Therefore, there is a strong demand for reliable sealing of the gas generating agent 13 and the ignition charge 17.

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]

A gas generant pack for an air bag expansion gas generator according to claim 1, wherein a plurality of annular plate-shaped gas generants each having a through hole formed in the center thereof are laminated, and an ignition agent is accommodated in the through hole. , These gas generating agents are housed in a sealed container made of a metal bottomed cup and a metal cap having a recess formed in the center, and the opening of the cup is folded back toward the outside. , The outer peripheral portion of the cap is covered, the outer peripheral edge of the cap is folded inward, and the folded portion is inserted between the outer peripheral surface of the cup and the folded portion, and the double winding molding is performed. In addition, the concave portion of the cap is depressed toward the through hole side of the gas generating agent to form a housing portion for the igniter.

According to a second aspect of the present invention, there is provided a gas generating agent pack for an air bag deployment gas generator, wherein the cup and the cap are made of an aluminum alloy.

A gas generating agent pack of an air bag expanding gas generating apparatus according to a third aspect is the gas generating agent pack according to the first or second aspect, wherein the cap side outer peripheral portion is coated with a winding sealing agent.

[Action]

In the gas generating agent pack of the gas generator for airbag deployment according to claim 1, the opening of the cup is folded back toward the outside, the folded back portion is covered by the outer peripheral portion of the cap, and further, the outer peripheral portion of the cap is covered. The outer peripheral edge is folded back toward the inside, and this portion is inserted between the outer peripheral surface of the cup and the folded portion, and double winding is performed.

In the gas generating agent pack of the gas generator for airbag deployment according to the second aspect, the cup and the cap are made of an aluminum alloy.

In the gas generating agent pack of the gas generating device for airbag deployment according to the third aspect, the sealing agent for winding is applied to the cup-side outer peripheral portion of the cap.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 4 show the details of the gas generant pack in the gas generator for airbag deployment of FIG. 5, and FIG. 5 shows the gas generation of the gas generator for airbag deployment of the present invention. 1 shows an example of a drug pack.

In FIG. 5, reference numeral 41 indicates 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.

A filling chamber filter including an upper filter 53 and a gas filtering filter 55 is housed in the filling chamber 51. 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 tubular portion 61 of 59 and a lid member 65 that is electron beam welded 63 to this opening.

As shown in FIGS. 6 and 7, the housing main body 59 has a bottomed tubular portion 61, and a flange portion 67 formed integrally with the opening of the bottomed tubular portion 61 toward the outside. And the bottom surface 69 of the housing body 59 from the outer periphery of the flange 67.
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. 5, in the charging chamber 51, the outer tubular portion 71 and the bottomed tubular portion 61 of the housing main body 59 are covered by the covering member 77 from the bottom face 69 side of the housing main body 59, The covering member 77 is formed by welding and joining to the outer cylindrical portion 71 and the bottomed cylindrical portion 61 by welding 79, 80 such as an electron beam or a laser beam.

In this embodiment, the covering member 77 has an L-shaped cross section as shown in FIG. 8, one end of which is fitted inside the outer cylinder portion 71 of the housing body 59 and the other end of which is formed. The inner periphery of the bent portion 81 formed in the above is in contact with the outer periphery of the bottomed tubular portion 61 of the housing body 59.

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

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

Five gas generating agents 43 are arranged outside the igniter 45 and the igniting agent 47 in the combustion chamber 41, and in this embodiment, each gas generating agent 43 has a through hole formed in the center. It is formed in an annular plate shape.

Incidentally, each gas generating agent 43, in order to improve the ignitability, it is desirable to have a drum shape in which both end surfaces are thin and the center portion is thick, or only both end surface portions are chamfered, and the center portion has a flat shape. May be divided into 2 to 4 at a predetermined angle from the center.

The gas generating agent 43 is, for example,
% 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 to 22 g of granules having these compositions are weighed to form an annular molding die. It is manufactured by filling a mold and press-molding at a pressure of 40 to 60 tons.

These gas generating agents 43 are stacked, and an igniter 45 and an igniter 47 are arranged in a through hole formed in the center.

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

These separators 83 are, for example, stainless steel 10
It is made of an annular wire mesh using # 45 wires to improve the ignitability of the gas generating agent 43 and to secure an exhaust passage for the gas generating agent 43.

Thus, in this embodiment, these gas generating agents 43,
The separator 83, the ignition charge 47, and the combustion chamber filter 49 are integrated as a gas generation agent pack 84 in order to prevent the gas generation agent 43 and the ignition charge 47 from absorbing moisture.

That is, these members 43, 83, 47, 49 are the same as the cap 86.
And a cup 87.

The cap 86 and the cup 87 are made of an aluminum alloy and are formed by pressing a thin plate having a plate thickness of about 0.15 to 0.40 mm, for example.

The cap 86 and the cup 87 are joined by double winding molding.

That is, as shown in FIG. 3, the opening portion of the cup 87 is folded back toward the outside, and the folded portion 96 is capped.
The outer peripheral edge 98 of the outer peripheral portion 97 of the cap 86 is folded back toward the inner side, and this portion is inserted between the outer peripheral surface of the cup 87 and the folded portion 96. It is formed by heavy winding.

Further, in this embodiment, as shown in FIG. 4, the styrene.
A sealing sealant 99 made of butadiene rubber, synthetic rubber such as ethylene / propylene rubber, silicon rubber, acrylic rubber or the like is applied.

A recess 88 for accommodating the igniter 45 is formed in the center of the cap 86 of the hermetically sealed container 85, which is depressed toward the through hole side of the gas generating agent 43.

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 aggregating magnesium with Teflon.

The ignition powder 47 is, for example, a cotton-like ignition powder composed of 60% by weight of magnesium and 40% by weight of Teflon.
When 1 g of ignition powder is used, the calorific value is 1940 calories / g and the gas generation rate is 41 cc / g. In comparison, since the calorific value is high and the gas generation amount is low, it is possible to obtain the performance in which the gas generating agent 43 is not cracked and there is no time delay.

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.
Was destroyed, abnormal combustion is likely to occur, and even when it did not result in destruction, there was variation in ignitability, but in this example, magnesium is directly agglomerated with Teflon at the center of the gas generating agent 43. Since the formed igniting agent 47 is filled, the risk of the gas generating agent 43 being destroyed 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 the 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 discharge path of the combustion gas. 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 charging chamber 51 is divided into upper and lower parts by a partition plate 89. An upper filter (second filter) 53 is provided on the upper part of the partition plate 89, and a gas filtration filter (third filter) 55 is provided on the lower part. It is arranged.

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 77.
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 arranged opposite to the orifice 82 formed in the housing body 59, and is formed, for example, by press-molding a stainless twill wire mesh with a ring-shaped mold. The upper filter 53 collides the high-velocity combustion gas ejected from the orifice 82 with the slag screen to make the high-velocity combustion gas turbulent,
It acts to attach combustion gas residues to the wire mesh.

Thus, in this embodiment, the gas filtration filter 55 is
Cool the combustion gas to such an extent that the airbag does not burn out,
Further, it has a function of removing combustion residues contained in the combustion gas and supplying only harmless nitrogen gas to the airbag.

And, in order to prevent gas leakage from the gas filtration filter 55, sealing members are provided above and below the gas filtration filter 55.
91 is stuck on both sides of the filter.

The seal member 91 is made of heat-resistant and flame-retardant rubber such as silicone rubber, fluorine rubber, acrylic rubber, and ethylene vinyl acetate copolymer in order to prevent fuel loss. It is set 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 a combustion chamber filter 49 arranged along the inner periphery of the combustion chamber 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.

Therefore, in the gas generant pack of the gas generator for airbag deployment configured as described above, the through hole 44 is formed in the center.
5 of the annular plate-shaped gas-generating agent 43 is laminated,
While accommodating the igniting agent 47 in the through hole 44, these gas generating agents 43 are accommodated in a sealed container 85 composed of a metal cup 87 and a cap 86, and the opening of the cup 87 is directed to the outside. In addition to folding back, the folding portion 96 is covered with the outer peripheral portion 97 of the cap 86, and the outer peripheral edge 98 of the outer peripheral portion 97 of the cap 86 is folded back toward the inside so that the space between the outer peripheral surface of the cup 87 and the folding portion 96 is increased. Since it is inserted into and is subjected to double winding molding, it is possible to reliably seal the gas generating agent 43 and the igniting agent 47 with a simple structure.

That is, unlike the conventional case, since it is not necessary to form a through hole for inserting and fixing a plug in a cartridge containing a gas generating agent, it is possible to reliably seal the gas generating agent and the ignition powder with a simple structure. It will be possible.

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,
The igniter 45 can be easily and surely arranged adjacent to the 47.

Further, in the gas generating agent pack 84 of this embodiment, since the cup 87 and the cap 86 are made of an aluminum alloy, the weight of the airbag expanding gas generating device can be significantly reduced as compared with the conventional case.

Further, since the sealing agent 99 for winding is applied to the outer peripheral portion of the cap 86 on the cup 87 side, the sealing agent 99 for sealing serves as a packing, and the airtightness of the double-sealing molded portion can be further improved. Becomes

〔The invention's effect〕

As described above, in the gas generating agent pack of the gas generating device for airbag deployment according to claim 1, a plurality of annular plate-shaped gas generating agents each having a through hole formed in the center are laminated and attached to the inside of the through hole. In addition to containing explosives, these gas generating agents are contained in a sealed container consisting of a metal bottomed cup and a metal cap with a recess formed in the center, and the opening of the cup is placed outside. Fold it back, cover the folded part with the outer peripheral part of the cap, fold the outer peripheral edge of the cap inward, and insert it between the outer peripheral surface of the cup and the folded part. Since it is formed by tightening, and the recess of the cap is depressed toward the through hole side of the gas generating agent to form the accommodation portion of the ignition tool, the gas generating agent and the ignition agent can be reliably sealed, and the ignition tool is also provided. Housing section Since located adjacent to the ignition charge,
The igniter can be easily and reliably placed adjacent to the ignition charge.

In the gas generating agent pack for an air bag expanding gas generator of claim 2, since the cup and the cap are made of an aluminum alloy in claim 1, the weight of the air bag expanding gas generator is significantly reduced as compared with the conventional one. can do.

In the gas generating agent pack of the gas generator for airbag deployment according to claim 3, since the winding sealing agent is applied to the cup-side outer peripheral portion of the cap according to claim 1 or 2, this winding sealing agent is It becomes a packing, and the air tightness of the gas generating agent pack can be further improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the gas generant pack of FIG. 2 is a cross-sectional view of the gas generant pack of FIG. 1 taken along the line II-II. FIG. 3 is a vertical cross-sectional view showing details of a double winding molding part of the gas generant pack of FIG. FIG. 4 is an explanatory diagram showing a winding sealant applied to the outer peripheral portion of the cap. FIG. 5 is a vertical cross-sectional view showing an air bag expansion gas generator having an embodiment of a gas generant pack of the air bag expansion gas generator of the present invention. FIG. 6 is a longitudinal sectional view showing the housing body of FIG. FIG. 7 is a top view of the housing body of FIG. FIG. 8 is a longitudinal sectional view showing the covering member of FIG. FIG. 9 is a vertical cross-sectional view showing a conventional air bag deployment gas generator. [Explanation of symbols of main parts] 41 …… combustion chamber 43 …… gas generating agent 44 …… through hole 45 …… igniter 47 …… igniter 49 …… combustion chamber filter 51 …… filling chamber 57 …… Gas outlet 85 …… Sealed container 86 …… Cap 87 …… Cup 96 …… Folded part 97 …… Outer peripheral part 98 …… Outer peripheral edge 99 …… Sealing agent for tightening.

Claims (3)

(57) [Claims] 1. A plurality of annular plate-shaped gas generating agents each having a through hole formed in the center thereof are stacked, an igniting agent is accommodated in the through holes, and these gas generating agents are made of metal and have a bottom. Is housed in a sealed container made of a cup and a metal cap having a recess formed in the center, and the opening of the cup is folded back toward the outside, and the folded portion is covered with the outer periphery of the cap, Further, the outer peripheral edge of the cap is folded back inward, inserted between the outer peripheral surface of the cup and the folded back portion, and double-rolled and molded. A gas generant pack for a gas generator for airbag deployment, characterized in that it is depressed toward the through hole side of the agent to form an accommodation part for the igniter. 2. The gas generating agent pack for a gas generating device for airbag deployment according to claim 1, wherein the cup and the cap are made of an aluminum alloy. 3. The gas generating agent pack for an air bag expanding gas generating device according to claim 1, wherein a sealing agent for winding is applied to the outer peripheral portion of the cap on the cup side.