JPH05124482A - Gas generator for air bag - Google Patents

Abstract

PURPOSE:To generate no melted deposit fragments and avoid non-uniform gas flow b9 providing cutouts on a combustor cup, and forming a plurality of the cutouts which are provided with a described opening area and arranged at fixed intervals in the circumferential direction of the combustor cup. CONSTITUTION:A combustor cup 14 is formed into a cylindrical form of which one end side is closed and the other end side is opened. On the opened end side of the combustor cup 14, U-shaped cutouts 8 cut out in the axial direction from the end face 14a are provided. The cutouts 8 have a decided opening area, and a plurality of the cutouts are arranged at decided itervals in the circumferential direction of the combustor cup. Gas generated in a container made of aluminum filled with gas generating agent is uniformly ejected through the cutouts 8.

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 an airbag for protecting an occupant from an impact, and more particularly to the structure of a combustor cup for the gas generator.

[0002]

2. Description of the Related Art A combustor cup is set on the outside of a gas generating agent container, and the combustion gas of the gas generating agent is adjusted to a constant gas pressure so as to be uniformly ejected from a plurality of through holes. Is.

FIG. 3 shows the structure of a conventional combustor cup. Conventionally, a narrow portion 23 is formed between the cup end surface 22 and the through hole 21. Since the vicinity of the through hole is exposed to high temperature and high pressure gas, this narrow part 2
3 may melt and the debris may adhere to or damage the filter, coolant, etc., resulting in an uneven flow of gas.

Therefore, it is an object of the present invention to provide a novel gas generator for an air bag which solves the problems of the prior art.

[0005]

A gas generator for an air bag according to the present invention comprises a gas generator arranged in a space formed by an outer shell, and an opening for communicating the space with the air bag. The gas generator includes a cylindrical combustor cup that covers the gas generant container filled with the gas generant and has one end closed and the other end open to uniformly eject a constant gas pressure. In a gas generator that protects an occupant from impact by introducing gas generated in the gas generator by impact into the airbag, the combustor cup has a notch cut in the axial direction from the end face on the other end side. The cutout has a predetermined opening area and is formed in plural at predetermined intervals in the circumferential direction of the combustor cup.

In the combustor cup, the gas pressure is adjusted and jetted by the notch that is cut out in the axial direction from the end face, so that there is no narrow portion conventionally formed between the cup end face and the through hole. The non-uniform flow of gas that results from the melting damage of this narrow part is thus avoided, thus ensuring a uniform flow of constant gas pressure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a half sectional view of the gas generator.
The gas generator has a first outer shell or diffuser shell 1 and a second outer shell or closure shell 3 which forms a space 2 with the diffuser shell 1.

In the space 2, there is arranged a gas generating device composed of an ignition device, a gas generating agent container, and a combustor cup covering the container.

In the space 2, the ignition device housing chamber 4 is defined at the center by the female screw member 16, and the combustion chamber 5 is defined by the combustor cup 14 on the outside thereof.
A coolant / filter chamber 19 is formed surrounding the. The coolant / filter chamber 19 is further provided with a retainer 11
Are demarcated in the upper and lower rows.

In the ignition device accommodating chamber 4, there are an enhancer (transfer charge) 6 and a squib (igniter) 10 which constitute the ignition device.
And are housed. The transfer charge 6 is loaded in the female screw member 16, and the squib 10 is loaded in the male screw member 17 screwed onto the female screw member 16. Further, in the combustion chamber 5, an annular aluminum container 18 filled with a gas generating agent 15 is provided.
However, the inner circumference thereof is fitted to the outer circumference of the female screw member 16, and the outer circumference thereof is fitted to the inner circumference of the combustor cup 14 to be housed. Further, in the coolant / filter chamber 19, the filter 12 is accommodated in the upper stage and the coolant 13 is accommodated in the lower stage.

A passage 7 for transmitting the flame of the transfer charge 6 to the combustion chamber 5 is provided between the ignition device housing chamber 4 and the combustion chamber 5, and between the combustion chamber 5 and the coolant / filter chamber 19, An opening for introducing gas generated in the combustion chamber 5, that is, a notch 8 of the combustor cup is provided, and further, a coolant / filter chamber 19 and an air bag (not shown).
An opening 9 for introducing the coolant and the gas that has passed through the filter is provided therebetween.

The combustor cup 14 has a cylindrical shape with one end closed and the other end open. The combustor cup 14 has an end surface 14a on the open other end side.
It has a U-shaped cutout 8 that is cut out in the axial direction from. The notches 8 have a predetermined opening area, and a plurality of the notches 8 are arranged at predetermined intervals in the circumferential direction of the combustor cup.

When a sensor (not shown) is actuated by an impact, the squib 10 is ignited, which ignites the transfer charge 6. The high-temperature, high-pressure flame generated thereby passes through the passage 7 and penetrates the wall of the aluminum container 18 filled with the gas generating agent to ignite the gas generating agent 15 inside. The gas generated in the container 18 is uniformly ejected through the notch 8, passes through the coolant 13 and the filter 12, and then flows into the airbag through the opening 9.

[0015]

Since the present invention is constructed as described above, no melt-out debris is produced, thus avoiding the non-uniform flow of gas induced by the debris. Therefore, according to the present invention, the airbag can always be inflated normally.

Further, by making the gas ejection uniform, it is possible to prevent heat damage to the airbag.

[Brief description of drawings]

FIG. 1 is a half sectional view of the present gas generator.

FIG. 2 is a perspective view of a combustor cup according to the present invention.

FIG. 3 is a perspective view of a conventional combustor cup.

[Explanation of symbols]

 1 Diffuser shell 2 Space 3 Closure shell 8 Notch 9 Opening 14 Combustor cup 15 Gas generating agent 18 Gas generating agent container

Claims (1)

[Claims] 1. A gas generating device disposed in a space formed by an outer shell, and an opening communicating the space with the air bag. The gas generating device is filled with a gas generating agent. The gas generator container is covered with a cylindrical combustor cup with one end closed and the other end open for uniformly ejecting a constant gas pressure. In the gas generator for protecting the occupant from the impact by being introduced into the above, the combustor cup has a notch axially cut away from the end face on the other end side, and the notch has a predetermined opening area. A plurality of gas generators for airbags are formed at a predetermined interval in the circumferential direction of the combustor cup.