JPH0245239A - Gas generation device for expanding air bag - Google Patents

Abstract

PURPOSE:To ensure the prevention of the discharge of a combustion gas outside by discharging a high pressure gas generated via the combustion of a gas generation agent in a combustion chamber from a nozzle to a charging chamber and further from the second nozzle to an air bag via an intake chamber and the third nozzle. CONSTITUTION:An ignitor and an ignition chemical for the combustion of a gas generation agent are provided in a combustion chamber to house the gas generation agent in the device in the title, and a combustion chamber filter is provided along the internal surface of the combustion chamber 11. Also, a charging chamber 13 is so provided annularly as to enclose the combustion chamber 11 concentrically, and the combustion chamber 11 and the charging chamber 13 are made continuous to each other via the first nozzle 15. Furthermore, an intake chamber 17 is so provided as to enclose the charging chamber 13 concentrically and made continuous thereto via the second nozzle 19. In addition, the third nozzle 21 open to the inside of an air bag is made open to the intake chamber 17. Also, an intake hole 23 open to the atmosphere is formed in the intake chamber 17 and fitted with a non-return vale 25 open only in a direction from the atmosphere to the intake chamber 17.

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.

It relates to a gas generator for airbag deployment used to deploy airbags in rubber boats, escape chutes, etc., and is especially used for airbag deployment that can replenish the lack of gas required for airbag deployment with air. Regarding a gas generator.

[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 air pack deployment gas generator is ignited and burned, and the generated gas is used to deploy the air bag. It deploys instantly to protect the driver from a collision and prevent serious injury to the driver.

At this time, the amount of gas generating agent required to deploy the airbag is 70 to 100 g, and the total f! The amount is 600-1100g.

[Problem to be solved by the invention]

However, in such conventional airbag deployment gas generators, the airbag is deployed only by the gas generated by combustion of the gas generating agent, so the 60%
Even with an airbag that has the volume of a liter, the amount of gas generating agent required to deploy it is relatively large at 70 to 100 g. is relatively large and heavy.

On the other hand, by reducing the amount of gas generating agent used, it is possible to make the gas generator smaller and lighter, but on the other hand, the amount of gas generated decreases, making the airbag deployment insufficient and reducing collision safety. The functionality of the device deteriorates, and it becomes necessary to replenish the shortage with air or the like.

Therefore, an air ejector that sucks air using high pressure gas,
Alternatively, it is possible to incorporate a steam ejector into the gas generator, but since the pressure of the high-pressure gas in this type of ejector is as low as 10 kg/cIa or less, it can be In order to be able to suck in a large amount of air in 10 milliseconds, the ejector itself must be made larger, which makes the gas generator larger and heavier, making it difficult to use it for airbags in automobiles. is not possible.

In order to solve such problems, the applicant has filed a patent application filed in 1983.
No. 2-29339 and Japanese Patent Application No. 62-29340 were filed for a gas generator for airbag deployment.

The airbag deployment gas generator disclosed in Japanese Patent Application No. 62-29339 includes a housing body with an open airbag connection side and a gas generating agent formed in the center of the housing body to generate high-pressure gas. A ring-shaped mixing chamber is formed by arranging a combustion chamber concentrically on the opening side of the housing main body at a desired distance from the inner wall thereof, and introducing high-pressure gas from the combustion chamber into the mixing chamber. a ring-shaped nozzle provided at the high-pressure gas introduction part to the mixing chamber by the partition wall and for spouting high-pressure gas at high speed toward the opening side of the mixing chamber; and a ring-shaped nozzle formed on the housing body along the nozzle. It is equipped with an air intake port.

Furthermore, the airbag deployment gas generator disclosed in Japanese Patent Application No. 62-29340 includes a housing body, a large-diameter air introduction opening formed in the center of the housing body along its axial direction, and the housing body. A mixing chamber is located in the center of the housing body and communicates with the air introduction opening so that its axis coincides with the air bag, and the mixing chamber is formed on the outer circumferential side of the housing body and generates high-pressure gas by burning a gas generating agent. A combustion chamber that generates a combustion chamber, and a large number of nozzles that are formed along the entire circumference of the joint between the air introduction opening and the mixing chamber and eject the high-pressure gas from the combustion chamber at high speed toward the opening side of the mixing chamber. It is made up of the following.

These gas generators for airbag deployment are each equipped with an air intake port or an air introduction opening, so the amount of gas generating agent used can be reduced without interfering with the deployment of the airbag. In addition, it is small, lightweight, and highly safe.

However, these gas generators for airbag deployment simply have an air intake or air introduction opening, so the combustion gas from the gas generating agent passes through the air intake or air introduction opening and is released into the atmosphere. There is a risk that this may occur.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a gas generator for deploying an airbag that can reliably prevent the combustion gas of a gas generating agent from being released into the atmosphere. .

[Means to solve the problem]

The airbag deployment gas generating device of the present invention includes a combustion chamber that generates high-pressure gas by burning a gas generating agent contained therein, and a filling chamber that surrounds the combustion chamber.
an intake chamber arranged surrounding the air-filled chamber; a first nozzle that communicates the combustion chamber and the air-filled chamber; a second nozzle that communicates the air-filled chamber and the intake chamber; a third nozzle having one end open to the air pack and the other end opening to the air pack; an intake hole formed in the intake chamber and opening to the atmosphere; and a third nozzle arranged in the intake hole and opening only from the atmosphere side to the intake chamber side. It is equipped with a check valve.

[For production]

In the air pack deployment gas generator of the present invention, when the gas generating agent housed in the combustion chamber is combusted, high-pressure gas is generated in the combustion chamber, and this combustion gas is transmitted through the combustion chamber that communicates the combustion chamber with the filling chamber. After passing through the first nozzle, it flows into the air charging chamber, and then after passing through the second nozzle that communicates the air filling chamber and the intake chamber, it flows into the air intake chamber, and then, one end is opened in the air intake chamber. Then, the other end passes through a third nozzle that opens into the air pack, and flows out into the air pack.

On the other hand, due to the circulation of combustion gas into the intake chamber,
This creates a negative pressure state, which opens the check valve located in the intake hole that is formed in the intake chamber and opens into the atmosphere, and air from the atmosphere flows into the intake chamber, and together with the combustion gas, the third
Outflows from the nozzle into the air pack.

In the initial and final stages of combustion of the gas generating agent, the pressure inside the intake chamber may be higher than atmospheric pressure.
At this time, since the intake hole is closed by the check valve, combustion gas is not released to the outside.

〔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.

1 and 2 show an embodiment of the gas generator for deploying an air pack according to the present invention, and in the figures, reference numeral 11
indicates a combustion chamber in which a gas generating agent is accommodated.

An igniter and igniter for burning the gas generating agent are arranged in the center of the combustion chamber 11, and a combustion chamber filter is arranged along the inner periphery of the combustion chamber 11.

Further, a filling chamber 13 concentrically surrounds the combustion chamber 11 and into which gas that has passed through a combustion chamber filter flows is arranged in an annular manner.
It is communicated by.

An air filling chamber filter is housed in the air filling chamber 13.

An air intake chamber 17 is disposed concentrically surrounding the air filling chamber 13, and the air filling chamber 13 and the air intake chamber 17 are communicated with each other through a second nozzle 19.

One end of the third nozzle 21 is open to the intake chamber 17, and the other end of the third nozzle 21 is opened to the air pack. This third nozzle 21 has a larger diameter than the second nozzle 19 and is arranged on the same axis as the second nozzle 19.

The intake chamber 17 is formed with an intake hole 23 that opens into the atmosphere.
A check valve 25 that is opened only on the side is arranged.

In the figure, reference numeral 27 indicates a mounting hole for attaching the air pack deployment gas generator to the air pack.
The air pack is attached to the bottom of this.

3 and 4 show a check valve 25 disposed in the intake hole 23 formed in the intake chamber F, and the check valve 25 is made of, for example, hard rubber or metal. There is.

The check valve 25 has an annular shape with an inverted V-shaped cross section, and a plurality of elongated holes 35 and 37 are formed at a predetermined angle on both sides of the central portion 33 of the valve body 31. There is.

In the air pack deployment gas generator configured as described above, when the gas generating agent housed in the combustion chamber 11 burns, high-pressure gas is generated in the combustion chamber 11, and this combustion gas is transferred to the combustion chamber 11. and a first nozzle 15 that communicates with the air chamber 13.
After passing through, the air flows into the air filling chamber 13, and then passes through the second nozzle 19 that communicates the air filling chamber 13 and the intake chamber 17, flows into the air intake chamber 17, and then flows into the air intake chamber 17. A third nozzle 21 that opens one end to the chamber 17 and the other end to the air pack.
and flows out into the air pack.

On the other hand, due to the flow of combustion gas into the intake chamber 17, the intake chamber 1
7 becomes a negative pressure state, this causes the check valve 2 disposed in the intake hole 23 of the intake chamber 17 to open as shown in FIG.
5 moves toward the intake chamber 17 side until it abuts against a locking portion 39 formed in the intake chamber 17, and a gap 43 is formed between the central portion 33 of the valve body 31 and the valve seat 41, and a check is made. The valve 25 is opened, and atmospheric air flows into the intake chamber 17 through the elongated hole 35.37 as shown by the arrow in FIG. 5, and flows out from the third nozzle 21 into the air pack together with the combustion gas. .

At the beginning and end of combustion of the gas generating agent, the pressure inside the intake chamber 17 may become higher than atmospheric pressure, but at this time, as shown in FIG. Since the hole 23 is closed, combustion gas is not released to the outside.

That is, in the air pack deployment gas generator configured as described above, the air intake chamber 17 is connected to the air intake hole 23 from the atmosphere side.
Since the check valve 25 that opens only on the side is arranged, when the pressure inside the intake chamber 17 becomes higher than the atmospheric pressure, the check valve 25 closes the intake hole 23, which prevents combustion. Emission of gas into the atmosphere can be reliably prevented.

In addition, in the gas generator for air pack deployment configured as above, since the intake hole 23 is provided, the amount of gas generating agent used can be reduced without causing any hindrance to the deployment of the air pack. And small.

It is lightweight and highly safe.

〔Effect of the invention〕

As described above, according to the present invention, the gas generator for deploying an air pack is provided with a combustion chamber that generates high-pressure gas by burning a gas generating agent contained therein, and is arranged to surround this combustion chamber. a filling chamber arranged to surround the filling chamber, a first nozzle communicating the combustion chamber with the filling chamber, and a first nozzle communicating the filling chamber with the intake chamber. 2 nozzles, a third nozzle that opens one end into the intake chamber and the other end into the air pack, an intake hole formed in the intake chamber and opens into the atmosphere, and a third nozzle arranged in the intake hole from the atmosphere side. Since the check valve is configured with a check valve that is opened only on the intake chamber side, there is an advantage that combustion gas can be reliably prevented from being released into the atmosphere.

25...Check valve.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the gas generator for deploying an air pack according to the present invention. FIG. 2 is a top view of FIG. 1. FIG. 3 is a top view of the check valve of FIG. 1. FIG. 4 is a longitudinal sectional view of the check valve of FIG. 3. FIG. 5 is a longitudinal sectional view showing a state in which the check valve is open in the air pack deployment gas generator of FIG. 1. [Explanation of symbols of main parts] 11... Combustion chamber 13... Filling chamber 15... First nozzle 17... Intake chamber 19... Second nozzle 21... Third nozzle 23 ...Intake hole

Claims (1)

[Claims] (1) A combustion chamber that generates high-pressure gas by burning a gas generating agent stored therein, a filling chamber that surrounds this combustion chamber, and a filling chamber that surrounds this filling chamber. a first nozzle that communicates between the combustion chamber and the filling chamber;
a second nozzle that communicates between the air filling chamber and the intake chamber; a third nozzle that opens one end to the intake chamber and the other end to the air bag; and an intake hole that is formed in the intake chamber and opens to the atmosphere. and a check valve that is disposed in the intake hole and opens only from the atmosphere side to the intake chamber side.