JPH0487859A - Gas generation device for bag development - Google Patents

Abstract

PURPOSE:To obviate to provide a combustion chamber filter by forming a sealed container composed of a aluminum thin-walled material and also forming a container expansion space to allow expansion the sealed container toward a partitioning member when gas-generating agent burns between the inner surface of the partitioning member and the circumferential outer surface of the sealed container. CONSTITUTION:In this gas-generating device, there are arranged an igniter 45 and ignition powder 47 in the center of a combustion chamber 41 accommodating gas- generating agent 43, and a filling chamber 51 is arranged circumferentially where gas flows in after passing orifices 82 formed in a partitioning member 61 surrounding the combustion chamber 41. Gas-generating agent 43 and ignition chemical 47 are stored in a sealed container 85 in form of a gas-generating agent pack. A container expansion space 97 is formed between the partitioning member 61 and a sealed container 85 so as to allow expansion of the sealed container 85 toward the partitioning member 61. The sealed container 85 is expanded into the container expansion space 97 due to the pressure of combustion gas. A combustion gas passage is formed within this expansion space, hence the combustion chamber filter to secure gas passage can be obviated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an air bag and a life bag for a collision safety device.

[Conventional technology]

Conventionally, collision safety devices for passenger cars to protect the driver from shock during a collision include an airbag with a capacity of 60 liters and an airbag deployment gas for deploying the airbag with gas. When a passenger car collides, a gas generating agent made of explosives or similar compositions filled in the airbag deployment gas generator is ignited and burned, and the generated gas generates air. The system instantly deploys the back of the vehicle to protect the driver from collisions and prevent serious injuries to the driver.

FIG. 6 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 17 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 for causing 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 0.06 seconds.

[Problems to be Solved by the Invention] However, in such a conventional gas generating device for deploying an air bank, it is difficult to form a predetermined gas flow in the cartridge 27 that accommodates the gas generating agent 13 in the combustion chamber 11. Therefore, it is necessary to install a combustion chamber filter 19, which poses a problem of increased manufacturing cost.

The present invention solves the above-mentioned problems, and aims to provide a gas generating device for deploying an air bag that can eliminate the need for installing a combustion chamber filter in a sealed container containing a gas generating agent. purpose.

[Means for Solving the Problems] The airbag deployment gas generator of the present invention includes a cylindrical partition member that surrounds a combustion chamber to form a filling chamber and partitions the combustion chamber and the filling chamber. In the airbag deployment gas generating device, an orifice communicating a combustion chamber and a filling chamber is formed, and a sealed container in which a gas generating agent is housed is disposed within the combustion chamber, the sealed container being made of aluminum. A container formed of a thin material made of a thin material, and having a space between the inner surface of the partition member and the outer circumferential surface of the sealed container to allow expansion of the sealed container toward the partition member when the gas generating agent in the sealed container is combusted. It forms an expansion space.

[For production]

In the airbag deployment gas generator of the present invention, the sealed container is formed of a thin material made of aluminum, and between the inner surface of the partition member and the outer peripheral surface of the sealed container, when the gas generating agent in the sealed container is burned, Since the container expansion space that allows the sealed container to expand toward the partition member is formed, when the gas generating agent burns, the sealed container expands into the container expansion space due to the pressure of the combustion gas, and this bulging portion A gas passage for combustion gas is formed.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 shows an embodiment of the airbag deployment gas generating device of the present invention, and in the figure, reference numeral 41 indicates a combustion chamber in which a gas generating agent 43 is accommodated.

At 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 filling chamber 51 that surrounds the combustion chamber 41 and into which gas that has passed through an orifice 82 formed in the partition member 61 flows into the chamber 51 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 accommodated.

Furthermore, a gas outlet 57 is arranged in the air-filled chamber 51 to allow the gas that has passed through the gas filtration filter 55 to flow out to the air puncture.

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

As shown in FIGS. 2 and 3, the housing main body 59 includes a partition member 61, a flange portion 67 integrally formed at the opening of the partition member 61 toward the outside,
It is formed from an outer cylindrical portion 71 that is bent from the outer periphery of the flange portion 67 toward the bottom surface portion 69 side of the housing body 59 .

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.

As shown in FIG. 1, the air filling chamber 51 is formed by covering the outer cylindrical portion 71 and the partition member 61 of the housing body 59 from the bottom surface 69 side of the housing body 59 with a covering member 77. The member 77 is connected to the outer cylinder portion 71 and the partition member 61.
Welding with electron beam or laser beam etc. 79.80
It is formed by welding and joining.

In this embodiment, as shown in FIG. 4, the cover member 77 has a curved cross section, and one end is fitted inside the outer cylindrical portion 71 of the housing main body 59, and the other end The inner periphery of the bent portion 81 formed in the partition member 6 of the housing body 59
It is in contact with the outer periphery of 1.

For example, 18 orifices 82 are formed in the partition member 61 of the housing body 59 at a predetermined angle, and in the cover member 77, for example, 18 orifices 82 are formed at a predetermined angle. A gas outlet 57 is formed.

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

Five gas generating agents 43 are arranged outside the igniter 45:8 and the igniter 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 into an annular plate shape.

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

Further, a separator 83 is arranged between each gas generating agent 43.

These separators 83 are made of stainless steel, for example.
It is made of an annular wire gauze using wires with numbers 0 to 45, 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 example, the gas generating agent 43. The separator 83 and the ignition charge 47 are integrated as a gas generating agent pack in order to prevent the gas generating agent 43 and the ignition charge 47 from absorbing moisture.

That is, these members 43, 83, 47 are housed in a sealed container 85 consisting of a cap 86 and a cup 87.

The cap 86 and the cup 87 are formed by pressing a thin plate made of aluminum or an aluminum alloy, and have a final thickness of, for example, 0.2 to 0.
．． The plate thickness is said to be approximately 4mm.

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

The gas generating agent 4 is placed in the center of the cap 86 of the sealed container 85.
A recess 88 is formed on the side of the through hole 3 to accommodate 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 formed by coagulating magnesium with Teflon.

The inside of the air chamber 51 is divided into upper and lower parts by a partition plate 89, and an upper filter 53 is disposed above the partition plate 89, and a gas filtration filter 55 is disposed below the partition plate 89.

The partition plate 89 is made of a material such as stainless steel or aluminum, and is press-fitted into the inner peripheral surface of the cover member 77.

This partition plate 89 changes the flow of the combustion gas that has passed through the orifice 82 of the partition member 61 and entered the filling chamber 51 and flows into the upper filter 53, so that the combustion gas flows into the gas filtration filter 55. Acts as a guide.

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 twill 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.

In this embodiment, the gas filtration filter 55 cools the combustion gas to an extent that the airbag will not burn out, removes combustion residue contained in the combustion gas, and supplies only harmless nitrogen gas to the airbag. It has the function of

Seal members 91 are fixed to both sides of the gas filtration filter 55 above and below to prevent gas leakage from the gas filtration filter 55.

This sealing member 91 is made of heat-resistant and flame-retardant rubber such as silicone rubber, fluorine rubber, acrylic rubber, and ethylene-vinyl acetate copolymer to prevent burning. It is said to be 3-2.0+wo.

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.

Therefore, in this embodiment, there is a gap between the inner surface of the partition member 61 and the outer peripheral surface of the sealed container 85 to prevent the expansion of the sealed container 85 toward the partition member 61 when the gas generating agent 43 in the sealed container 85 is combusted. A container expansion space 97 is formed to allow the expansion of the container.

Further, a recess 103 is formed in the cap 101, and between the recess 103 and the lid member 65, for example,
A cushion material 100 made of FFP is filled.

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 due to this combustion, the gas generating agent 43 is combusted, and the pressure of the combustion gas is increased. As a result, the sealed container 85 expands and breaks, and the gas from the gas generating agent 43 passes through the orifice 82 of the partition member 61 and flows into the plenum chamber 51, then flows into the upper filter 53 and collides with the partition plate 89. After being reversed, 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 airbag deployment gas generator configured as described above, the sealed container 85 is formed of a thin material made of aluminum, and a sealing seal is provided between the inner surface of the partition member 61 and the outer peripheral surface of the sealed container 85. Since the container expansion space 97 is formed to allow expansion of the sealed container 85 toward the partition member 61 when the gas generating agent 43 in the container 85 is combusted, when the gas generating agent 43 is combusted, the pressure of the combustion gas causes Since the sealed container 85 bulges into the container expansion space 97 and a gas passage for the combustion gas is formed in this bulge, it is not necessary to install a combustion chamber filter to ensure a gas passage for the combustion gas. It becomes possible.

Furthermore, since the sealed container 85 is reliably expanded by the container expansion space 97, the combustion of the gas generating agent 43 allows the sealed container 85 to be destroyed more reliably at the position of the orifice 82.

Furthermore, a concave portion 103 is formed in the cap 101, and a shoe seat member 10 is formed between the concave portion 103 and the lid member 65.
Since the gas generating agent 43 is filled with zero, the impact acting on the gas generating agent 43 can be alleviated.

FIG. 5 shows a sealed container of another embodiment of the airbag deployment gas generator of the present invention. A pack 109 is arranged.

Although almost the same effect as the embodiment shown in FIG. 1 can be obtained in the airbag deployment gas generator using the sealed container 105 configured as described above, in this embodiment, the ignition powder 107 Since the ignition powder 107 is housed in the pack 109, it is possible to effectively prevent the ignition powder 107 from dispersing.

[Effects of the Invention] As described above, in the airbag deployment gas generator of the present invention, the sealed container is formed of a thin material made of aluminum, and there is a space between the inner surface of the partition member and the outer peripheral surface of the sealed container. When the gas generating agent in the sealed container is combusted, a container expansion space is formed that allows expansion toward the partition member of the sealed container, so when the gas generating agent is combusted, the pressure of the combustion gas causes the sealed container to expand. Since it bulges into the space and a gas passage for the combustion gas is formed in this bulge, there is an advantage that it is not necessary to install a combustion chamber filter to ensure a gas passage for the combustion gas.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the airbag deployment gas generator of the present invention. 2 is a longitudinal sectional view showing the housing body of FIG. 1. FIG. 3 is a top view of the housing body of FIG. 2; FIG. FIG. 4 is a longitudinal sectional view showing the cover member of FIG. 1. FIG. 5 is a longitudinal sectional view showing a sealed container of another embodiment of the air bag deployment gas generator of the present invention. FIG. 6 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 51... Filling chamber 61... Partition member 82... Orifice 85... Sealed container 97... Container expansion space.

Claims (1)

[Claims] (1) An orifice is formed in a cylindrical partition member that surrounds the combustion chamber to form a filling chamber and partitions the combustion chamber and the filling chamber, and an orifice that communicates between the combustion chamber and the filling chamber is formed; In an airbag deployment gas generating device in which a sealed container containing a gas generating agent is disposed within a combustion chamber, the sealed container is formed of a thin material made of aluminum, and the inner surface of the partition member and the outer periphery of the sealed container are A gas generating device for deploying an air bag, characterized in that a container expansion space is formed between the surface and the surface of the sealed container to allow expansion of the sealed container toward the partition member when the gas generating agent in the sealed container is combusted.