JPH0642459U - Gas generator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a gas generator capable of providing a cooling member in a storage container for a gas generating agent without damaging the storage container and reducing the amount of slag flowing out from the gas generation chamber. To do. [Structure] A cylindrical container having a ring-shaped space 4 formed therein is provided, and the ring-shaped space 4 is divided by a partition wall 12 into a gas generation chamber 6
And the filter chambers 7 and 8 are divided into gas holes 4a,
In the gas generator 1 in which the gas generating chamber 6 is put in the storage container 13 and the gas generating agent 9 is stored in the storage container 13, a large number of holes are provided in the storage container 13. 14a is opened, and a cylindrical cooling member 14 that forms a space 20 between the inner surface 13d of the storage container on the side where the gas hole 4a is opened is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas generator used by being incorporated in an airbag safety device of a vehicle.

[0002]

[Prior art]

 The airbag safety device is attached to the center of the steering wheel and inflates like a balloon in the event of a collision and acts as a cushioning material between the steering wheel and the occupant. The gas generator supplies the gas to inflate this airbag.

Such a gas generator used for an air bag burns a gas generating agent in a gas generating chamber to generate a large amount of gas containing slag (combustion dust) at a high temperature and generating a gas. Cooling is performed with a cooling filter made of wire mesh, etc., which is placed between the chamber and the gas discharge hole, and slag is removed, and it is supplied to the airbag as clean gas at an appropriate temperature.

[0004]

[Problems to be solved by the device]

 By the way, in the above-mentioned gas generator, in order to cool the gas and remove the slag more effectively, it is proposed to put a cooling filter in the gas generation chamber (USP 4,296,086). reference). The gas generating agent is in the form of pellets, and there are a type that is stored in the gas generating chamber as it is and a type that is stored in a storage container. This container is made of a relatively thin metal foil because it must be broken by the hot air of the transfer charge and the generated gas when the gas generant is burned. For this reason, the wire mesh can be used as a cooling filter for the type that does not use a storage container, but if the wire mesh is used as a cooling filter for the type that uses a storage container, the wire mesh may damage the storage container. Was.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a cooling member in a storage container for a gas generating agent without damaging the storage container. It is to provide a gas generator that can reduce the outflow amount of slag from the gas generation chamber.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the gas generator of the present invention includes a cylindrical container having a ring-shaped space formed therein, and the ring-shaped space is partitioned by a partition into a gas generation chamber and a filter chamber, and these are separated into gas. In a gas generator that communicates with holes to allow gas to be released to the outside, and a gas generating agent is stored in a storage container in the gas generation chamber, a large number of holes are opened in the storage container. A cylindrical cooling member is provided which forms a space between the hole and the inner surface of the storage container on the side where the hole is opened.

[0007]

[Action]

 According to the above configuration, the generated gas passes through a large number of holes that are opened in the cooling member, and flows out of the gas generation chamber through the space formed between the cooling member and the inner surface of the storage container. The gas is cooled while it is in contact with the cooling member, and the slag is removed when passing through the hole opening in the cooling member. Here, as in the conventional case, with the wire mesh coolant, since each wire is knitted but not fixed, there is a possibility that the slag partially spreads the stitches and flows out. However, since the holes of the cooling member have a fixed shape, such a possibility does not occur. Further, since the cooling member has a fixed shape, it is possible to appropriately treat the upper and lower ends contacting the inner surface of the storage container by bending the ends outward, for example, so as not to damage the container.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a sectional view of the gas generator of the present invention, and FIG. 2 is a sectional view of the cooling member of FIG.

First, the structure of the gas generator of the present invention will be described with reference to FIG. In FIG. 1, the gas generator 1 has a cylindrical container-like appearance and includes an upper container 2 and a lower container 3. The upper container 2 is a hollow cylinder having an outer wall 16 and an inner wall 15. The lower container 3 has a lid shape, and both are integrated by pressure welding or welding, and are divided by an inner wall 15 into a central portion 5 and a ring-shaped outer peripheral portion 4. Further, the lower container 3 is formed with a cylindrical portion 3a projecting upward in a central portion thereof, and a squib 17 which is activated by receiving a current supply through a collision sensor (not shown) is housed in the cylindrical portion 3a. A transfer charge 18 is stored above the central portion in contact with the squib 17. The squib 17 and transfer charge 18 constitute an ignition means. The outer peripheral portion 4 is divided into three chambers by a ring-shaped partition wall 12, and the gas generating agent 9 is housed on the inner diameter side, the cooling filter 10 is housed on the lower outer diameter side, and the filter filter 11 is housed on the outer outer diameter side. . A wire mesh or the like is used for the cooling filter 10, and a ceramic filter or the like is used for the filtration filter 11. Then, a gas hole 15a communicating from the transfer charge 18 to the gas generating chamber 6 is opened in the inner wall 15, and the first gas hole 4a connecting the gas generating chamber 6 and the cooling filter chamber 7 and the cooling filter chamber 7 and the filtration are provided. A second gas hole 4b communicating with the filter chamber 8 is opened in the partition wall 4, and a gas hole 16a communicating with the outside of the filter chamber 8 is opened in the outer wall 16.

The gas generating agent 9 is in the form of pellets and is stored in the gas generating chamber 6 in a ring-shaped storage container 13. The storage container 13 is composed of a cup portion 13a and a lid portion 13b, and is sealed by caulking the upper end after the gas generating agent 9 is put therein. Inside the storage container 13, a cylindrical cooling member 14 having a large number of holes 14a opened is contacted at both upper and lower ends with the storage container inner surface 13d on the side where the gas holes 4a communicating with the cooling filter chamber 7 are opened. It is provided so as to form a space 20 therebetween. Here, the cooling member 14 may be provided so as to reach the lid portion 13b of the storage container 13 as shown in the drawing, or may have a height halfway without reaching the lid portion 13b. The gas generating agent 9 may be arranged in the space 20. In this case, the gas generated by the gas generating agent 9 in this portion does not have the effect of cooling and slag removal by the cooling member 14, but since the amount is small, it does not significantly affect the whole. As a conventionally known method, a cushion material 19 may be arranged at the bottom of the storage container to prevent the gas generant 9 from dancing.

The cooling member 14 will be described in more detail with reference to FIG. In FIG. 2, the cooling member 14 is made of a heat resistant material such as stainless steel, and first, a plate material is punch-pressed to form a large number of holes. The thickness is preferably about 0.5 mm to 1.0 mm. If it is less than 0.5 mm, the cooling member 14 may be deformed by the gas pressure, and if it exceeds 1.0 mm, the weight and the installation space may be increased, and cooling may be overkill. Further, the hole diameter is preferably about φ0.5 mm to φ3.0 mm. If it is less than 0.5 mm, it is difficult for gas to pass therethrough, the pressure in the combustion chamber may rise too much, and the cooling member 14 may be deformed, and if it exceeds 3.0 mm, the slag cannot be effectively removed.

Next, the punch-pressed plate material is bent, both ends are welded to form a cylindrical shape, and the upper end and the lower end are pressed to form the bent portion 14b on the outer side. The bent portion 14b is for forming a space between the bent portion 14b and the inner surface of the storage container. In this case, the cooling member 14 is in contact with the inner surface of the storage container at the side surface of the bent portion 14b, so that there is no possibility of damaging the storage container.

As a method of forming a space with the inner surface of the storage container, the upper end 21 may be directly contacted with the upper surface of the storage container without forming a bent portion as shown in A. In this case, the corner portion 21a may be chamfered by pressing or the like so that burr or the like does not occur on the end surface. Further, as shown in B, it is also possible to form a space between the inner surface of the container and the cushion member 22 without forming bent portions at both upper and lower ends.

Next, the operation of the gas generator configured as described above will be described with reference to FIG. The hot air of the transfer charge 18 ignited by the squib 17 passes through the gas holes 15a, breaks the storage container 13 in the gas generation chamber 6, and flows into the inside. The hot air causes a chemical reaction of the gas generating agent 9, and a large amount of gas containing slag is generated at a high temperature in a short time. The generated gas passes through a large number of holes 14a opening in the cooling member 14, passes through the space 20 formed between the inner surface of the storage container 13 and the storage container 13, and breaks the storage container 13 from the gas holes 4a to the cooling filter chamber 7. leak. Then, the gas is cooled while it is in contact with the cooling member 14, and the slag is removed when passing through the hole 14 a opening in the cooling member 14. Here, as in the conventional case, when the wire mesh cooling material is used, the slag may partially spread the stitches and flow out, but since the hole 14a of the cooling member 14 has a fixed shape, this is possible. There is no sex. Further, in the conventional gas generator, when the hot air of the transfer charge 18 jets from the gas hole 15a, it may reach the gas hole 4a directly and jet into the cooling filter chamber 7. However, in the gas generator 1, the cooling member is used. Since 14 is provided, this can be prevented.

The gas flow flowing out to the cooling filter chamber 7 passes through the cooling filter 10 where it is further cooled and slag is removed, and then passes through the second gas hole 4b to the final stage of the filtering filter chamber 8. enter. Then, fine slag is removed by the filtration filter 11, becomes clean gas at an appropriate temperature and is jetted from the gas holes 16a into the airbag (not shown).

Since the fixed cooling member is used for cooling the gas and removing the slag in the gas generating chamber as described above, even if the gas generator is of a type that stores the gas generating agent in a container, It is possible to reduce the outflow amount of slag without fear of damaging the slag.

[0017]

[Effect of device]

 In the gas generator of the present invention, as described above, the cylindrical cooling member having a large number of holes opened in the storage container is provided on the inner surface of the storage container on the side where the gas holes communicating with the cooling filter chamber are opened. The upper and lower ends contact each other to form a space therebetween, and the generated gas flows out of the gas generation chamber through the gas holes through the holes of the cooling member and the space. The slag is removed as it passes through the holes and is cooled. Therefore, it is possible to reduce the outflow of slag from the gas generator. Then, as in the conventional case, with the wire mesh cooling material, the slag may partially spread the stitches and flow out, but this is not possible because the holes of the cooling member have a fixed shape. Further, since the cooling member has a fixed shape, it is possible to appropriately treat the upper and lower ends contacting the inner surface of the storage container so as not to damage the container.

[Brief description of drawings]

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

2 is a cross-sectional view of the cooling member of FIG.

[Explanation of symbols]

 4 Outer peripheral portion (ring-shaped space) 4a First gas hole 4b Second gas hole 6 Gas generating chamber 7 Cooling filter chamber 8 Filtration filter chamber 9 Gas generating agent 12 Partition wall 13 Storage container 13d Storage container inner surface on the side where the gas holes are opened 14 cooling member 14a hole 16a gas hole 20 space

Claims (1)

[Scope of utility model registration request] 1. A cylindrical container having a ring-shaped space formed therein is provided, and the ring-shaped space is partitioned by a partition into a gas generation chamber and a filter chamber, and these are communicated with gas holes to enable gas to be released to the outside. In the gas generator in which the gas generating agent is stored in the storage container in the gas generation chamber, a large number of holes are opened in the storage container, and the inner surface of the storage container on the side where the gas holes are opened. A gas generator comprising a cylindrical cooling member that forms a space therebetween.