JPH07196001A - Gas generator - Google Patents

Abstract

PURPOSE:To provide a gas generator wherein the number of a part item or an assembly manday is reduced and structure is simplified by considering the using an gas generating agent less in the generation of slag and excellent in moisture resistance. CONSTITUTION:This generator is provided with one side vessel member 1 having an attaching flange 1a, the other vessel member 2 for matching to the vessel member 2, a joining means 4 in the vicinity of matching parts 1a and 2a, plural ring partitioning members 13-15 positioned on at least any one side of vessel members 1 or 2 and partitioning in a peripheral direction a space formed of both the vessel members l and 2, and gas holes 13a-15a provided on the partitioning members 13-15 and directing in a diameter direction. Ignition members 3 and 8, gas generating agents 5 and 6, and a filter member 7 are arranged in order from the center in these respective partitioned spaces 9-12, and also a gas emission hole 16 is provided on the side surface of any vessel member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator used in an airbag device for protecting an occupant of a vehicle.

[0002]

2. Description of the Related Art Conventionally, an azide-based chemical has been mainly used as a gas generating agent in this type of gas generator. This azide-containing agent contains sodium and generates combustion gas by a chemical reaction and also generates high temperature slag (slag).
For this reason, it was necessary to equip the gas generator with a filter for removing slag and maintaining the gas at an appropriate pressure-time characteristic and temperature. Further, since the azide-based drug has a property that it is extremely toxic when it absorbs moisture, and has a property of generating explosive hydrazoic acid, a sealed container for storing the gas generating agent in a sealed state is required.

Therefore, such a gas generator has a chamber for storing a hermetically-sealed container for a gas generating agent in a short cylindrical container composed of an upper container and a lower container, and a combustion gas in a complicated path. The chamber for accommodating the passing filter is arranged axially and radially offset from each other, and the combustion gas is discharged from the side surface of the container. In addition, since it is necessary to withstand this pressure, the container is made of a sturdy aluminum forged product, etc., and the upper container and lower container are also joined by friction welding or with a pressure resistant structure with screws. It was

[0004]

Therefore, in the gas generator described above, the cost of the container, which is a forged aluminum product, is high,
The number of parts is large and the number of assembling steps is large, resulting in an increase in cost. In the case of friction welding, it is difficult to control the height of the entire gas generator.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to use a gas generating agent which produces less slag and is excellent in moisture resistance. Focusing on this, it is to provide a gas generator in which the number of parts and the number of assembling steps are reduced and the structure is simplified.

[0006]

In order to solve the above-mentioned problems, a gas generator according to the present invention has one container member having a mounting flange, the other container member fitted to the container member, and the mating portion. A plurality of ring partition members positioned in the vicinity of the joining means and at least one of the container members and partitioning the space formed by the both container members in the circumferential direction, and provided in the partition member in the radial direction. A gas hole is provided, and an ignition member, a gas generating agent, and a filter member are arranged in order from the center in each of the partitioned spaces, and a gas discharge hole is provided on the side surface of one of the container members. .

[0007]

[Function] For example, a gas generating agent containing no sodium azide and using triaminoguanidine / nitrate alone or as a main material becomes carbon dioxide gas / nitrogen gas / vapor when burned, and hardly generates high temperature slag, It is not hygroscopic. Therefore, the gas generant container is not required to be hermetically sealed, and the gas filter is not required, so that the structure of the gas generator is basically simplified. At the same time, a long outflow path formed by this gas filter is also eliminated, so that a high gas pressure is not required and a pressure resistant structure is not particularly required.

Therefore, two mounting flanges (upper
It is possible to have a structure in which the container members of (below) are joined. With such a structure, it is not necessary to rotate one of the containers unlike friction welding, so that the space inside the container can be partitioned.
The ring-shaped partition member can be simply fitted into the positioning groove provided in the container member at the time of joining. Also,
Since the ring-shaped partition member also cools the gas passing through the gas holes, it is not necessary to separately provide a cooling member.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a gas generator of the present invention.

First, the structure will be described. In FIG. 1, a gas generator 20 comprises a short cylindrical upper container 1 having a mounting flange 1a, and a lower container 2 having a mounting flange 2a and fitted to the upper container 1, and both containers 1 and 2 are mounted. The flanges 1a and 2a are fastened with a bolt 4 to be joined. The mounting flanges 1a and 2a are similarly bolted to the handle through mounting holes (not shown). Also,
A gas release hole 1b is provided on the side surface of the upper container 1.
The space formed by both containers 1 and 2 is partitioned in the circumferential direction by three ring-shaped partition members 13 to 15 sequentially arranged from the center to the outside. Ring partition members 13 to 15
Is a large number of gases 13a to 15a each directed in the radial direction.
And a positioning groove 1 provided on the bottom surface of each container 1, 2.
It is fitted and fixed in c and 2c. Each of the spaces 9 to 12 partitioned by the ring partition members 13 to 15 forms an ignition chamber 9, gas generation chambers 10 and 11, and a filter chamber 12 in this order from the center, and the squib 3 and a transmission that contacts the squib 3 are formed in the ignition chamber 9. The explosive 8 (ignition member), the gas generating agents 5 and 6 are arranged in the gas generating chambers 10 and 11, and the filter 7 is arranged in the filter chamber 12. The squib 3 is connected to a power source (not shown) by a lead wire 16.

A press housing made of steel is used for the upper container 1 and the lower container 2. Therefore, the cost can be reduced as compared with the conventional aluminum forged product. Ring partition member 1
In consideration of heat resistance and economy, 3 to 15 are made of steel, for example. Further, the ring partition members 13 to 15
When aligning the upper container 1 and the lower container 2, for example, these ring partition members 13 are placed in the positioning groove 2c of the lower container 2.
15 to 15 are fitted and positioned and placed, and then fitted and fixed in the positioning groove 1c of the upper container 1. Therefore,
The work is simplified as compared with the press-fitting or the like adopted in the conventional friction welding. The positioning grooves 1c and 2c may be provided on either one of them. Further, the bolt connection by the mounting flange improves the accuracy of the height H of the gas generator and facilitates its management. For example, the check of the height H can be omitted. Furthermore, for example, the gas generator 20 is recovered from a scrap car, the bolt 4 is removed,
The gas generating agent can be taken out and recycled.

As the gas generating agents 5 and 6, novel ones have been developed which do not generate slag by reaction (combustion) and have no hygroscopicity, and these are used. For example, JP-A-5
As disclosed in JP-A-254977, those containing no sodium azide and using triaminoguanidine / nitrate alone or as a main material are used. Combustion gas is carbon dioxide gas, nitrogen gas, and steam, and does not generate slag that must be removed. Further, the two types of gas generating agents 5 and 6 have different combustion speeds, and by combining these different combustion speeds, the deployment speed of an airbag (not shown) can be adjusted. For simplification, one type of gas generating agent may be used.

Next, the operation of the above-mentioned gas generator will be described. In FIG. 1, when a vehicle collision is detected by a collision sensor (not shown), the squib 3 is electrically heated and ignited to ignite the transfer charge 7, and the ignition of the transfer charge 7 causes the gas generating agents 5, 7 to react. Generate a large amount of gas. The generated gas is separated by the ring partition member 14, as indicated by the arrow 17.
This ring partition member 1 while passing 15 in the radial direction
Cooled at 4, 15 and filter 7 as indicated by arrow 18.
After being cooled and filtered by, the gas is discharged from the gas discharge hole 1b to the outside of the container, becomes a gas having an appropriate temperature, and is supplied to the airbag.

[0014]

As described above, the gas generator of the present invention joins the upper and lower container members with the mounting flange in accordance with the use of the gas generating agent which hardly generates high temperature slag and has no hygroscopicity. In order to partition the space inside the container, a ring partition member positioned on the container member is used, and the ring-shaped partition member can simultaneously cool the gas. it can. Therefore, it is possible to reduce the number of parts of the gas generator and the number of assembling steps, and to simplify the structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gas generator of the present invention.

[Explanation of symbols]

 1 upper container (container member) 1a mounting flange 2 lower container (container member) 2a mounting flange 3 squib (ignition member) 4 bolt (joining means) 5 gas generating agent 6 gas generating agent 7 filter (filter member) 8 transfer charge ( Ignition member) 13 ring partition member 13a gas hole 14 ring partition member 14a gas hole 15 ring partition member 15a gas hole 16 gas release hole 20 gas generator

Claims (5)

[Claims] 1. A container member having a mounting flange, another container member fitted to this container member, a joining means in the vicinity of the mating portion, and a container member positioned at least one of the container members. A plurality of ring partition members for circumferentially partitioning the space formed by the container member,
The partition member has a gas hole extending in the radial direction, and each of the partitioned spaces has an ignition member in order from the center,
A gas generator in which a gas generating agent and a filter member are arranged, and a gas discharge hole is provided on a side surface of any container member. 2. The gas generator according to claim 1, wherein the joining means is a bolt coupling means. 3. The gas generator according to claim 1, wherein the ring partition member is made of steel. 4. The gas generator according to claim 1, wherein the partition space in which the gas generating agent is arranged is divided into a plurality of parts by a ring partition member. 5. The gas generator according to claim 1, wherein the gas generating agent does not contain sodium azide, and triaminoguanidine / nitrate is used alone or as a main material.