JP3137390B2 - Gas generator for airbag - Google Patents

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 air bag for protecting an occupant from an impact, and more particularly to a structure of a combustor cup.

[0002]

2. Description of the Related Art A combustor cup is set outside a gas generating agent container, and adjusts a combustion gas of the gas generating agent to a constant gas pressure so as to uniformly jet through a plurality of through holes. It is.

FIG. 3 shows the structure of a conventional combustor cup. Conventionally, a narrow portion 23 is formed between the cup end face 22 and the through hole 21. Since the vicinity of the through-hole is exposed to high-temperature and high-pressure gas, this narrow portion 2
3 may be melted, and the debris may adhere to or damage the filter, the coolant, and the like, thereby causing an uneven flow of gas.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel gas generator for an airbag which solves the above-mentioned problems of the prior art.

[0005]

According to the present invention, there is provided a gas generator for an airbag, comprising: a gas generator disposed in a space formed by an outer shell; and an opening communicating between the space and the inside of the airbag. The gas generator includes a cylindrical combustor cup having one end closed and the other end open to cover a gas generating agent container filled with a gas generating agent and to uniformly jet a constant gas pressure. A gas generator that introduces gas generated by the gas generating device into the airbag by an impact to protect an occupant from the impact, wherein the combustor cup has a notch at an opposite end thereof cut off in an axial direction from an end face. The notch has a predetermined opening area and is formed in a plurality at predetermined intervals in a circumferential direction of the combustor cup.

In the combustor cup, the gas pressure is adjusted and ejected by a notch cut in the axial direction from the end face, so that the narrow portion conventionally formed between the cup end face and the through hole is eliminated. The non-uniform flow of the gas resulting from the erosion of this narrow part is thus avoided, thus ensuring a uniform flow at a constant gas pressure.

[0007]

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, that is, a diffuser shell 1, and a second outer shell that forms a space 2 with the diffuser shell 1, that is, a closure shell 3.

In the space 2, there is arranged a gas generator comprising an igniter, a gas generating agent container, and a combustor cup covering the same.

In the space 2, an ignition device housing chamber 4 is defined at the center by a female screw member 16, and a combustion chamber 5 is defined outside by a combustor cup 14, and the combustion chamber 5 is further defined.
, A coolant / filter chamber 19 is formed. The coolant / filter chamber 19 further holds the retainer 11.
Is defined in the upper and lower tiers.

In the igniter accommodating chamber 4, an enhancer (transfer agent) 6 and a squib (igniter) 10 constituting an igniter are provided.
And are housed. The transfer charge 6 is loaded on a female screw member 16, and the squib 10 is loaded on a male screw member 17 screwed to the female screw member 16. An annular aluminum container 18 filled with a gas generating agent 15 is provided in the combustion chamber 5.
However, the inner circumference is fitted to the outer circumference of the female screw member 16, and the outer circumference is fitted to the inner circumference of the combustor cup 14 and 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 accommodating 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 a coolant / filter chamber 19 and an airbag (not shown) are further provided.
An opening 9 for introducing the gas that has passed through the coolant and the filter is provided between them.

The combustor cup 14 has a cylindrical shape with one end closed and the other end open. The combustor cup 14 has an end face 14a at the other open end.
And has a U-shaped notch 8 cut out in the axial direction. The notches 8 have a predetermined opening area and are arranged in plural numbers 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, whereby the transfer charge 6 is ignited. The high-temperature and high-pressure flame generated thereby passes through the passage 7 and breaks through the wall of the aluminum container 18 filled with the gas generating agent, and ignites the gas generating agent 15 inside. The gas generated in the container 18 is jetted uniformly through the notch 8, passes through the coolant 13 and the filter 12, and flows into the airbag through the opening 9.

[0015]

Since the present invention is constructed as described above, no erodible debris is generated, and thus, the non-uniform flow of gas induced by the generation of debris is avoided. Therefore, according to the present invention, the inflation of the airbag can always be performed normally.

Further, since the gas ejection becomes uniform, thermal damage to the airbag can be prevented.

[Brief description of the drawings]

FIG. 1 is a half sectional view of the 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]

 DESCRIPTION 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)

(57) [Claims] 1. A gas generator disposed in a space formed by an outer shell, and an opening communicating between the space and an airbag, wherein the gas generator is filled with a gas generating agent. And a cylindrical combustor cup having one end closed and the other end open to cover the gas generating agent container and uniformly jet a constant gas pressure. In the gas generator for protecting the occupant from an impact by introducing the combustor cup, the other end side has a cutout cut out in the axial direction from the end face, and the cutout has a predetermined opening area. A plurality of gas generators for an airbag, wherein a plurality of gas generators are formed at predetermined intervals in a circumferential direction of a combustor cup.