JPH07285411A - Gas generator for airbag deployment - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The dimensional accuracy required for the housing body and cover member of the gas generator for airbag deployment can be reduced, and welding can be performed easily when welding is required. To do. A combustion chamber 41 is formed by a bottomed tubular portion 75 of a housing body 65 and a lid member 67 fixed to this opening, and the housing body is held by the bottomed tubular portion. It is formed by a flange portion 77 formed integrally with the opening of the bottom tubular portion toward the outside, and an outer cylinder portion 79 bent from the outer periphery of the flange portion toward the bottom surface side of the housing body. , The outer cylindrical portion of the covering member that includes the outer bottom portion 83 that covers the bottom portion of the housing body and the outer cylindrical portion 85 that is integrally formed on the outer periphery of the outer bottom portion. It is configured by being fixed to the outer cylinder part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator for deploying an airbag used for deploying an airbag such as an air bag for a collision safety device, a life saving bag, a rubber boat, an escape chute, etc. by a combustion gas.

[0002]

2. Description of the Related Art Conventionally, in a passenger vehicle, 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 a airbag for deploying the airbag with gas. It is composed of an airbag-deploying gas generator, and at the time of a collision of a passenger vehicle, an explosive filled in the airbag-deploying gas generator or a gas generating agent composed of a similar composition is ignited and burned, and its generation. The gas instantaneously deploys the airbag to protect the driver from collisions and prevent serious injury to the driver.

FIG. 3 shows a conventional gas generator for deploying an air bag disclosed in Japanese Patent Application Laid-Open No. 2-155857, in which reference numeral 11 indicates a plurality of gas generating agents 13.
Shows a combustion chamber housed in a stacked state.

The gas generating agent 13 is in the form of an annular plate having a through hole 15 formed in the center thereof, and an igniting agent 17 is contained in the through hole 15. These gas generating agents 13 are
It is housed in a hermetically sealed container 19, and a recess 21 is formed in the center of the hermetically sealed container 19 so as to be depressed 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 the recess 21. A combustion chamber filter 25 is arranged along the inner circumference of the combustion chamber 11, and a gas filling the combustion chamber 11 and passing through the combustion chamber filter 25 flows from an orifice 26 into a charging chamber 27.
They are arranged in a ring.

A filling chamber filter consisting of an upper filter 29 and a gas filtering filter 31 is housed in the filling chamber 27. In addition, in the charging chamber 27, a gas outlet 33 for discharging the gas that has passed through the gas filtration filter 31 to the airbag is formed.

In such a gas generator for deploying an air bag, when electricity is applied to the igniter 23, the explosive in the igniter 23 burns to ignite the igniting charge 17, and the combustion causes the gas generating agent to burn. 13 combusts, the gas of the gas generating agent 13 passes through the combustion chamber filter 25 arranged along the inner circumference of the combustion chamber 11 and flows into the charging chamber 27, and then the upper filter 29 and the gas filtration filter. The gas is purified by 31, passes through the gas outlet 33, and flows into the airbag.
The airbag is sufficiently inflated in a short time of about 0.04 seconds.

[0008]

However, in such a conventional air bag deployment gas generator, the inner cylindrical portion 35a of the covering member 35 forming the replenishment chamber 27 is replaced by the housing forming the combustion chamber 11. The cylindrical portion 37a of the main body 37
Therefore, there is a problem that the cover member 35 and the housing body 37 need to have high dimensional accuracy.

The inner cylindrical portion 35a of the cover member 35
Since it is necessary to weld W on the tubular portion 37a of the housing body 37 over the entire circumference, there is a problem that a large number of man-hours are required for the welding W.

The present invention solves the above problems and can reduce the dimensional accuracy required for the housing body and the covering member, and when welding is required, perform the welding easily. An object of the present invention is to provide a gas generator for deploying an air bag that can perform the above.

[0011]

According to a first aspect of the present invention, there is provided a gas generating device for deploying an air bag, wherein a replenishing chamber into which a combustion gas from the combustion chamber flows is concentrically provided outside a combustion chamber in which a gas generating agent is contained. In the gas generator for deploying an air bag, the combustion chamber is formed by a bottomed cylindrical portion of a housing body and a lid member fixed to the opening, and the housing body is A bottomed tubular portion, a flange portion formed integrally with the opening of the bottomed tubular portion toward the outside, and bent from the outer periphery of the flange portion toward the bottom surface side of the housing body. The outer side of the cover member which is formed of an outer cylinder part and which includes the outer bottom surface part that covers the bottom surface part of the housing body and the outer cylindrical part that is integrally formed on the outer periphery of the outer bottom surface part. Formed by fixing the tubular part to the outer tubular part It is made of Te.

According to a second aspect of the present invention, there is provided the gas generator for deploying an air bag according to the first aspect, wherein the thickness of the outer bottom surface of the cover member is smaller than the thickness of the bottom surface of the housing body. .

According to a third aspect of the present invention, there is provided the gas generating device for airbag deployment according to the first or second aspect, wherein the outer bottom surface portion of the cover member is spot-welded to the bottom surface portion of the housing body.

A gas generator for deploying an air bag according to a fourth aspect is the gas generator for inflating an air bag according to the first or second aspect, wherein the outer bottom surface portion of the cover member is laser beam welded or electron beam welded to the bottom surface portion of the housing body. Is.

[0015]

In the gas generator for deploying the air bag according to the first aspect of the present invention, the bottom surface portion of the housing main body is covered by the outer bottom surface portion of the cover member that forms the filling chamber. No need to fit into.

In the gas generator for deploying the air bag according to the second aspect of the present invention, the wall thickness of the outer bottom surface of the cover member is made smaller than the wall thickness of the bottom surface of the housing body. Weight is reduced.

In the gas generator for deploying the air bag according to the third aspect, the outer bottom surface of the cover member is spot-welded to the bottom surface of the housing body, so that welding is simplified. In the gas generator for airbag deployment according to claim 4, since the outer bottom surface of the cover member is laser beam welded or electron beam welded to the bottom surface of the housing body, the ring shape is provided along the outer periphery of the bottom surface of the housing body. Can be easily welded to.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show an embodiment of a gas generator for deploying an air bag of the present invention, and FIG. 1 shows the housing body and cover member of FIG.

In FIG. 2, reference numeral 41 indicates a combustion chamber in which a plurality of gas generating agents 43 are contained in a stacked state. The gas generating agent 43 has an annular plate shape in which a through hole 45 is formed in the center, and an igniting agent 47 is contained in the through hole 45.

These gas generating agents 43 are stored in a sealed container 49.
A recess 51 is formed at the center of the hermetically-sealed container 49 and is recessed toward the through hole 45 side of the gas generating agent 43.

An igniter 53 for burning the gas generating agent 43 is arranged in the recess 51. A combustion chamber filter 55 is arranged along the inner circumference of the combustion chamber 41, and a gas filling chamber 57 that surrounds the combustion chamber 41 and passes the gas passing through the combustion chamber filter 55 from an orifice 56 is provided.
They are arranged in a ring.

A gas filling chamber filter including an upper filter 59 and a gas filtering filter 61 is housed in the gas filling chamber 57. In addition, in the charging chamber 57, a gas outlet 63 is formed for discharging the gas that has passed through the gas filtration filter 61 to the airbag.

However, in this embodiment, as shown in FIG. 1, the combustion chamber 41 and the charging chamber 57 are formed by the housing body 65, the lid member 67 and the covering member 69.

The housing body 65 has a bottomed tubular portion 75 consisting of a bottom portion 71 and a tubular portion 73, and the bottomed tubular portion 7
5, a flange portion 77 formed integrally with the opening portion toward the outside, an outer cylinder portion 79 bent from the outer periphery of the flange portion 77 toward the bottom face portion 71 side of the housing body 65,
The outer cylinder portion 79 is formed of a mounting portion 81 that is bent outward.

The cover member 69 is the housing body 6
5, an outer bottom surface portion 83 that covers the bottom surface portion 71 and an outer cylindrical portion 85 that is integrally formed on the outer circumference of the outer bottom surface portion 83.

Then, the outer cylindrical portion 85 of the covering member 69.
Is fitted to the inner circumference of the outer cylinder portion 79 of the housing body 65 and is fixed by welding W1, thereby forming the charging chamber 57.

The combustion chamber 41 has a housing body 65.
It is formed by fixing the lid member 67 to the opening of the bottomed tubular portion 75 by welding W2. In this embodiment, the thickness of the outer bottom surface portion 83 of the cover member 69 is
The thickness is smaller than the thickness of the bottom surface portion 71 of the housing body 65.

The housing body 65 is made of stainless steel, has a wall thickness of 1 to 2 mm, and is formed by press working. The cover member 69 is made of stainless steel, has a wall thickness of 0.5 to 1.5 mm, and is formed by press working.

In this embodiment, the outer bottom surface portion 83 of the covering member 69 is spot-welded W3 to the bottom surface portion 71 of the housing body 65. In the air bag deployment gas generator described above, when electricity is applied to the igniter 53, the ignition powder 47 is burned by the combustion of the explosive in the igniter 53, and this combustion causes the gas generant 43 to be burned. The gas of the gas generating agent 43 passes through the combustion chamber filter 55 arranged along the inner circumference of the combustion chamber 41, flows into the charging chamber 57, and is then purified by the upper filter 59 and the gas filtration filter 61. Then, the gas flows into the airbag through the gas outlet 63, and the airbag is sufficiently inflated in a short time of, for example, about 0.04 seconds.

However, in the above-described gas generator for deploying the air bag, since the outer bottom surface portion 83 of the cover member 69 forming the charging chamber 57 covers the bottom surface portion 71 of the housing body 65, the cover member 69. The housing body 6
It is not necessary to fit into the tubular portion 73 of No. 5, and the dimensional accuracy required for the housing body 65 and the covering member 69 can be reduced.

As a result, the dimensional control of the cover member 69 and the housing body 65 becomes easy, and the manufacturing cost can be reduced. In addition, since it is not necessary to form the inner tubular portion on the cover member 69 as in the conventional case, the number of molding steps by press working can be reduced.

Further, in the above-described air bag deployment gas generator, the thickness of the outer bottom surface portion 83 of the covering member 69 is
Since the thickness is made smaller than the thickness of the bottom surface portion 71 of the housing body 65, the material cost can be reduced and the weight of the device can be reduced.

Then, the bottom surface portion 71 of the housing main body 65 located on the driver side is located outside the bottom surface portion 83 of the cover member 69.
Since it is covered by, the safety can be further improved. Further, in the above-described air bag deployment gas generator, the outer bottom surface portion 83 of the cover member 69 is attached to the housing body 6.
Since the spot welding W3 is performed on the bottom surface portion 71 of No. 5, the welding can be easily performed.

In the embodiment described above, the cover member 6
9 is a bottom surface portion 71 of the housing body 65.
Although the example in which the spot welding W3 is performed is described above, the present invention is not limited to such an example. For example, the outer bottom surface portion of the cover member may be laser beam welded or electron beam welded to the bottom surface portion of the housing body. In this case, it is possible to easily perform annular welding along the outer periphery of the bottom surface portion of the housing body, and the cover member can be firmly fixed to the bottom surface portion of the housing body.

[0035]

As described above, in the gas generator for deploying the air bag according to the first aspect of the present invention, the bottom surface portion of the housing body is covered by the outer bottom surface portion of the cover member that forms the filling chamber. It is not necessary to fit the member into the tubular portion of the housing body, and the dimensional accuracy required for the housing body and the covering member can be reduced.

In the gas generator for deploying the air bag of claim 2, since the thickness of the outer bottom surface of the cover member is made smaller than the thickness of the bottom surface of the housing body, the material cost is reduced.
In addition, the weight of the device can be reduced.

In the gas generator for deploying the air bag of claim 3, the outer bottom surface of the cover member is spot-welded to the bottom surface of the housing body. Therefore, when welding is necessary, the welding is easily performed. be able to.

In the air bag deployment gas generator of claim 4, since the outer bottom surface of the cover member is laser beam welded or electron beam welded to the bottom surface of the housing body, the outer periphery of the bottom surface of the housing body is covered. There is an advantage that it is possible to easily weld the cover member in an annular shape, and the cover member can be firmly fixed to the bottom surface portion of the housing body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a housing body and a covering member of FIG.

FIG. 2 is a sectional view showing an embodiment of a gas generator for deploying an airbag of the present invention.

FIG. 3 is a cross-sectional view showing a conventional air bag deployment gas generator.

[Explanation of symbols]

 41 combustion chamber 43 gas generating agent 57 charging chamber 65 housing body 69 cover member 71 bottom surface portion 73 tubular portion 75 bottomed tubular portion 77 flange portion 79 outer tubular portion 83 outer bottom surface portion 85 outer tubular portion W3 spot welding

Claims (4)

[Claims] 1. A gas generating apparatus for deploying an air bag, comprising: a charging chamber, into which a combustion gas from the combustion chamber flows, concentrically formed outside a combustion chamber containing a gas generating agent. The chamber is formed by a bottomed tubular portion of the housing body and a lid member fixed to the opening, and the housing body is placed in the bottomed tubular portion and the opening of the bottomed tubular portion. The housing body is formed by a flange portion integrally formed toward the outside and an outer cylinder portion bent from the outer periphery of the flange portion toward the bottom surface side of the housing body. The outer cylindrical portion of the cover member is formed by fixing the outer cylindrical portion to the outer cylindrical portion, the outer cylindrical portion covering the bottom portion of the outer cylindrical portion, and the outer cylindrical portion integrally formed on the outer periphery of the outer bottom portion. A gas generator for airbag deployment characterized by. 2. The gas generator for airbag deployment according to claim 1, wherein the thickness of the outer bottom surface of the cover member is smaller than the thickness of the bottom surface of the housing body. 3. The gas generator for deploying an airbag according to claim 1, wherein an outer bottom surface portion of the cover member is spot-welded to a bottom surface portion of the housing body. 4. The airbag expanding gas according to claim 1, wherein the outer bottom surface of the cover member is laser beam welded or electron beam welded to the bottom surface of the housing body. Generator.