JP2847659B2 - Gas generator for airbag deployment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag deploying gas generator used to deploy an airbag such as an airbag, a lifesaving bag, a rubber boat, an escape chute or the like for a collision safety device using a combustion gas.

[0002]

2. Description of the Related Art 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 capacity of 60 liters and a gas bag for deploying the airbag. A gas generating device for deploying an airbag, and igniting and burning a gas generating agent made of explosives or a similar composition filled in the gas generating device for deploying an airbag when a passenger car collides, The gas instantly deploys the airbag to protect the driver from collisions and prevent serious injury to the driver.

FIG. 6 shows a conventional gas generator for deploying an air bag disclosed in Japanese Patent Application Laid-Open No. 1-297336. In the figure, reference numeral 11 denotes a long outer cylindrical member. A plurality of gas outlets 13 are formed on one side of the outer periphery of the outer cylindrical member 11.

A gas generating agent 15 in the form of a pellet is accommodated in the center of the outer cylindrical member 11, and a cylindrical purifying filter 17 is disposed between the gas generating agent 15 and the outer cylindrical member 11. ing.

[0005] A substantially semicircular barrier member 19 is disposed inside the purification filter 17 on the gas outlet 13 side. In the above-described gas generator for deploying an airbag, when the gas generating agent 15 burns, the gas generating agent 15
By the action of the barrier member 19, the combustion gas flows to the side opposite to the gas outlet 13 formed in the outer cylindrical member 11, and after colliding with the outer cylindrical member 11, is inverted and the purification filter 17 is turned off.
After that, the gas flows through the gas outlet 13 into the airbag, and the airbag is sufficiently inflated in a short time.

[0006]

However, in such a conventional gas generator for deploying an airbag, when the gas generating agent 15 burns, all the combustion gas is reduced by the action of the barrier member 19 to the outer cylindrical member. Since the gas flows toward the side opposite to the gas outlet 13 formed in the filter 11 and collides with the outer tubular member 11 and then reverses, and is mainly purified at a position opposite to the barrier member 19 in the purification filter 17, the purification filter 1
7 cannot be used effectively.

An object of the present invention is to solve the above-mentioned problems and to provide a gas generator for deploying an airbag which can effectively utilize the entire purification filter.

[0008]

According to the present invention, there is provided a gas generator for deploying an airbag, comprising: a long outer tubular member having a plurality of gas outlets formed on one side of an outer periphery; An inner tubular member having a gas flow hole formed therein, a purification filter disposed between the outer tubular member and the inner tubular member, and a gas generating agent contained in the inner tubular member. A plurality of the gas flow holes are formed over substantially the entire outer periphery of the inner cylindrical member, and the hole areas of these gas flow holes are increased as the distance from the gas outlet increases. .

[0009]

In the gas generator for deploying an airbag according to the present invention,
Because the hole area of the gas flow hole close to the gas outlet and where the outflow speed of the combustion gas is relatively fast is reduced, and the hole area of the gas flow hole that is far from the gas outlet and the outlet speed of the combustion gas is relatively slow is increased. The flow rate of the combustion gas flowing out from each gas flow hole toward the purification filter is substantially the same in each gas flow hole.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the gas generator for deploying an airbag according to the present invention. In the drawings, reference numeral 55 denotes an elongated outer cylindrical member having a bottom.

A plurality of gas outlets 57 are formed on one side of the outer periphery of the outer cylindrical member 55. Inside the outer tubular member 55, a tubular purification filter 59 is arranged.

The purifying filter 59 is formed, for example, by winding a fine wire mesh, a woven woven wire mesh, etc., to cool the combustion gas to such a degree that the airbag does not burn, and to remove the combustion residue contained in the combustion gas. It has a function of removing and supplying only harmless nitrogen gas to the airbag.

Inside the purifying filter 59, an inner cylindrical member 61 forming a combustion chamber is inserted. A large number of gas flow holes 63A, 63
B, 63C and 63D are formed.

A gas generating agent pack 65 is accommodated in the inner cylindrical member 61. That is, reference numeral 6 in FIG.
Reference numeral 7 denotes a long, bottomed cylindrical pack made of, for example, aluminum.

A plurality of gas generating agents 71 having a through hole 69 formed in the center thereof are accommodated in the cylindrical pack 67 in a stacked state in the axial direction. One side of the cylindrical pack 67
For example, it is sealed by a cap 73 made of aluminum.

The cap 73 is formed by winding the outer periphery around a cylindrical pack 67. A projection 77 for accommodating the igniter 75 is formed at the center of the cap 73.

The protruding portion 77 is inserted into a through hole 81 of a gas generating agent 71 disposed at one end of a bottomed cylindrical pack 67 via an igniter holder 79. Also,
In the through hole 83 of the gas generating agent 71 arranged on one side of the cylindrical pack 67, an igniting agent 85 is arranged adjacent to the end surface of the projection 77 of the cap 73.

The igniter 85 is contained in an igniter pack 87. A lid member 89 is disposed at an open end of the outer cylindrical member 55, and the lid member 89 is fixed to the outer cylindrical member 55 by caulking.

An igniter 75 is fixed to the lid member 89 by caulking. In this embodiment, as shown in FIGS. 3 to 5, gas flow holes 63A, 63B, 63C, and 63D are provided on the inner cylindrical member 61 over substantially the entire outer periphery of the inner cylindrical member 61. Is formed.

The gas flow holes 63A, 63A
The hole areas of B, 63C, and 63D increase as the distance from the gas outlet 57 formed on one side of the outer tubular member 55 increases.

That is, assuming that the center position O of the gas outlet 57 formed in the outer cylindrical member 55 is 0 °, a circular gas flow hole 63 formed at an angle of 45 ° from the center position O is provided.
A has a hole diameter of 4 mm and a circular gas flow hole 63B formed at an angle of 90 ° from the center position O has a hole diameter of 6 mm and a center position O.
Gas flow hole 63 formed at an angle of 135 ° from
C has a hole diameter of 8 mm, and a circular gas flow hole 63D formed at an angle of 180 ° from the center position O has a hole diameter of 10 mm.

In the above-described gas generating device for deploying an air bag, when electricity is supplied to the igniter 75, the igniting agent 85 burns, and the combustion causes the gas generating agent 71 to burn. The cylindrical pack 67 is attached to the inner cylindrical member 6.
The combustion gas breaks at the position of the first gas flow holes 63A, 63B, 63C, 63D, and the combustion gas flows through the gas flow holes 63A, 63B, 63C, 63D of the inner tubular member 61, flows into the purification filter 59, and is purified. The gas is purified by 59 and flows into the airbag from the gas outlet 57 of the outer tubular member 55.

In the gas generator for deploying an airbag constructed as described above, the gas flow holes 63A, 63A
A plurality of B, 63C, 63D are formed over substantially the entire outer periphery of the inner cylindrical member 61, and these gas flow holes 63A, 63D are formed.
Since the hole areas of 3B, 63C, and 63D are increased as the distance from the gas outlet 57 increases, the entire purification filter 59 can be effectively used, and the purification efficiency of the combustion gas by the purification filter 59 can be improved. Can be.

That is, in the above-described gas generator for deploying an air bag, the area of the gas circulation hole which is close to the gas outlet 57 and has a relatively high combustion gas outflow speed is reduced, and is far from the gas outlet 57. The hole area of the gas flow hole having a low outflow velocity of the specific combustion gas is increased.
The flow rate of the combustion gas flowing out from the 3A, 63B, 63C, 63D to the purification filter 59 side is determined by each of the gas flow holes 63A, 63A.
B, 63C, and 63D are almost the same. As a result, substantially the same amount of combustion gas flows into each part of the purification filter 59, and the entire purification filter 59 can be effectively used. .

Further, in the above-described gas generator for deploying an airbag, unlike the gas generator for deploying an airbag shown in FIG. 6, the combustion gas does not concentrate on the purification filter located on the side opposite to the gas outlet. Therefore, even if the pressure in the inner cylindrical member 61 is relatively small, the combustion gas can be reliably discharged from the gas outlet 57.

In the embodiment described above, the gas flow holes 63A, 63B, 63C, 63D and the gas outlet 57
Has been described in the form of a circle, but the present invention is not limited to this embodiment, and may be, for example, an elliptical shape, a long hole shape, or the like.

[0027]

As described above, in the gas generator for deploying an airbag according to the present invention, a plurality of gas flow holes are formed over substantially the entire outer periphery of the inner cylindrical member, and the hole areas of the gas flow holes are formed. Is increased as the distance from the gas outlet increases, so that there is an advantage that the entire purification filter can be used effectively.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along line II of FIG.

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

FIG. 3 is a side view showing the inner cylindrical member of FIG. 1 in a partial cross section.

FIG. 4 is a transverse sectional view taken along the line IV-IV in FIG.

FIG. 5 is a transverse sectional view taken along the line VV of FIG. 3;

FIG. 6 is a cross-sectional view showing a conventional gas generator for deploying an airbag.

[Explanation of symbols]

 55 Outer cylindrical member 57 Gas outlet 59 Purification filter 61 Inner cylindrical member 63A, 63B, 63C, 63D Gas flow hole 71 Gas generating agent

Continued on the front page (72) Inventor Kazuhiro Seki 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Inventor Kanichi Fukuda 1-4-1 Chuo, Wako-shi, Saitama Honda Co., Ltd. Within the Technical Research Institute (58) Field surveyed (Int. Cl. ⁶ , DB name) B01J 7/00 B60R 21/26

Claims (1)

(57) [Claims] An elongated outer cylindrical member having a plurality of gas outlets formed on one side of an outer periphery; an inner cylindrical member inserted into the outer cylindrical member and having a gas flow hole formed therein; A purifying filter disposed between the outer tubular member and the inner tubular member, and a gas generating agent housed in the inner tubular member, wherein the gas flow hole is formed of the inner tubular member. A gas generator for deploying an airbag, wherein a plurality of gas flow holes are formed over substantially the entire outer periphery, and the area of these gas flow holes is increased as the distance from the gas outlet increases.