JPH09207705A - Gas generator for air bag and its assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas generator for an air bag stable in quality and with generality by devising it to sufficiently respond to all of demands of miniaturization, lightening and reduction of cost and to favourably carry out adjustment of combustion pressure and its assembly method. SOLUTION: An upper container 1 and a lower container 4 are connected to each other by friction welding, a central ignition chamber P in the inside of an inside cylinder and a ring chamber R outside of the inside cylinder are partitioned by the inside cylinder positioned in a central part in a container and an ignition device is arranged in the central ignition chamber P. A gas generating agent 7 and a filter member 10 are arranged in the ring chamber R, the central ignition chamber P and the ring chamber R communicate to each other through an orifice 2a for inflammation formed in the inside cylinder and a gas discharge port 3a to discharge generated gas outside is provided on an outside cylinder of the container. Additionally, 8 retainer ring 16 to support the gas generating agent 7 and the filter member 10 is arranged in the ring chamber R so that its inner marginal part 16d and an outer marginal part 16e are supported and fixed by pressure welded burrs 2b, 3b of the upper container 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 for inflating an airbag, which is a vehicle occupant protection device, and a method for assembling the gas generator.

[0002]

2. Description of the Related Art Conventionally used gas generators have a central space portion corresponding to an ignition chamber for a gas generating agent and a concentric portion formed outside the central space portion to perform combustion, cooling, and slag collection of gas. A so-called two-chamber structure gas generator for an air bag having an annular space corresponding to the combustion / filter chamber, for example, the one shown in FIG. 22 is known. The structure will be briefly described with reference to the drawings. In the housing structure of the gas generator, an opening 132a is formed at the center of the shaft, and a flange 132d that rises from below and extends radially outward is formed on an outer peripheral portion 132b. , The flange 132d
Has a through hole 132e for attaching the gas generator to the airbag module. This lower container 1
32 on the inner peripheral surface 132f of the rising portion 132c,
The housing 133 is formed by welding the outer peripheral edge 131b of the outer cylindrical wall 131a of the upper container 131 with the opening facing downward. Further, the inner cylindrical wall 134 is provided at the opening 132a of the lower container 132 with the bottom surface of the upper container 131 (the ceiling surface in the drawing).
The central space 135 is formed by extending and fixing to the outside, and the outer annular space 136 is formed adjacent to the central space 135.

A squib 138 and a transfer charge 139 are installed from below in a central space 135 of the housing structure to form an ignition chamber P, and an outer annular space 136 has a gas generating agent 140 and a cooling / slag trapping member. Collecting filter member 1
A combustion / filter chamber is formed by sequentially accommodating 41 in the radial direction. G indicates a combustion section, and F indicates a filter arrangement section. A cushion material 143 is interposed between the gas generating agent 140 and the housing 133, and a flame transfer orifice 134a is further provided on the inner cylindrical wall 134.
The outer cylinder wall 131a of the upper container 131 is provided with gas discharge ports 144, respectively.

In the combustion of the gas generating agent, when the squib 138 is ignited, the flame thereof causes a transfer charge 139.
Is ignited and the hot air generated from the transfer charge passes through the transfer orifice 134a as shown by the arrow in FIG.
And ignites and burns the gas generant 140 to generate a high-temperature gas containing slag. The high temperature gas is cooled and slag is collected while passing through the filter portion F, and is finally supplied into the airbag (not shown) from the gas discharge port 144.

[0005]

In the case of such a conventional gas generator, since the outer shell 133 has a welded structure, in order to secure the high airtightness required for the gas generator, the upper container 131 is used. It is necessary to perform precise perimeter welding with the lower container 132 and the lower container 132 set accurately. However, in order to reliably carry out this, a very sophisticated and complicated welding apparatus is required first, and the equipment cost is greatly increased, and the production cost of the gas generator is unavoidably increased. Furthermore, although the welding method is full-circle fillet welding, even if external stimulation such as vibration for many years as an air bag gas generator is applied, the welded part is not adversely affected, that is, cracking or the like occurs. In order to prevent accidents, there is a problem with the reliability of the joint strength.

Further, the most important role of the gas generator for an air bag is to ensure that the air bag instantly and reliably inflates in a state where a desired internal pressure is maintained at the time of a collision of a vehicle. The agent does not deteriorate over a long period of time,
It must have a structure that maintains its physical and chemical properties, and that once it is ignited, it can burn at an appropriate burning rate and rise to a prescribed gas pressure. That is, the gas generator must have both a moisture-proof means for preventing the deterioration of the gas generating agent and a combustion pressure adjusting means for the gas generating agent in its structure. Here, the moisture-proof means means a means for preventing moisture in the air from being absorbed as much as possible during storage, especially for a gas generant of a type that dislikes humidity, because it deteriorates performance. means. The quality of the combustion pressure adjusting means basically depends on the airtightness of the combustion chamber.

However, if there is a defect in the fillet all-round welded joint, the airtightness decreases with the passage of time, and there is a possibility that normal combustion will be impeded at last. Further, when the filter member 141 is attached to the outer shell 133, no special structural measure considering the airtightness is found in the method of attachment and fixation, and the gas generated in the combustion section G is separated from the attachment and fixation section by a space. It is discharged to the outside through 142 and the gas discharge port 144,
Alternatively, when a crack occurs in the fillet welded joint, there is a high possibility that the crack will leak to the outside. Therefore, in the gas generator as shown in FIG. 22, the kind of the gas generating agent to be used is limited, the versatility is poor, and it is difficult to adjust the combustion pressure, and the gas generator for the airbag is safe and has good performance. There was a problem to provide.

Considering the means for eliminating such an inconvenience, there are two effective measures for ensuring the airtightness necessary for adjusting the combustion pressure. The first is a means for ensuring the airtightness between the combustion part G and the filter part F and the mounting and fixing part of the filter part F to the housing, and the second is a means for ensuring the airtightness.
The structure is such that the airtightness between the outside and the outside and the airtightness of the mounting portion of the filter member to the housing can be ensured. In the former case, specifically, a partition member for blocking the combustion part G and the filter part F is provided, and the partition member, the filter member 141, and the supporting member are attached to the outer shell 133 so as to be in close contact with each other, and the combustion is performed. It is conceivable that the gas generated in the part G is configured so as not to leak from the mounting parts of the respective members. On the other hand, as a moisture-proof measure against a gas generating agent that dislikes humidity, for example, a gas generating agent is sealed in advance in a thin film container made of aluminum or the like, and the container is set so that the container breaks when a predetermined pressure is applied during combustion. Can be used.

However, in the structure having the partition member, the support member for the filter member, the thin film container made of aluminum, etc., the effective volume in the gas generator is correspondingly reduced, and the gas generating agent and the filter member are Since the charging amount is relatively reduced, there remains a problem in improving the combustion efficiency and cooling efficiency of the gas generator. Also, the increase in the number of parts in this way
There are also problems in terms of miniaturization and weight reduction, which are always required for gas generators. Furthermore, not only the number of parts as a gas generator increases, but also the shapes of the partition member and the supporting member are complicated, which complicates the assembly of the gas generator,
There is also the problem of increasing production costs. In addition, in the case of the gas generator shown in FIG. 22, since expensive welding equipment is required in spite of the problem in the reliability of the welded joint strength as described above, the manufacturing cost is further increased, and The problem is that the generator becomes more expensive.

The present invention has been made to solve all of the problems of the conventional gas generator at once, and its purpose is to meet all the requirements of downsizing, weight saving, and cost reduction. It is to provide a highly versatile and safe gas generator that can fully meet the above requirements, and to provide a method of assembling such a gas generator.

[0011]

Among the present inventions that have achieved the above objects, the invention according to claim 1 is one in which the upper container and the lower container are joined by friction welding, and the upper container and the lower container are located at the center of the container. The inner cylinder defines a central ignition chamber inside the inner cylinder and an annular chamber outside the inner cylinder, an ignition device is disposed in the central ignition chamber, and a gas generating agent and a filter are provided in the annular chamber. A member is arranged, the central ignition chamber and the annular chamber are communicated with each other through a fire transfer orifice formed in the inner cylinder, and a gas discharge port for discharging generated gas to the outside is provided in the outer cylinder of the container. A two-chamber structure gas generator for an airbag, wherein a retainer ring for supporting the gas generating agent and the filter member is provided in the annular chamber, the inner peripheral edge portion and the outer peripheral edge portion of the retainer ring being in pressure contact with the upper container. It is arranged so as to be supported and fixed by burrs.

With such a structure, the retainer ring, which is a so-called common lid for both the gas generating agent and the filter member, is fixed by the pressure contact burr of the upper container formed during friction pressure welding. The filter member and the filter member are firmly held and fixed in the container, and the retainer ring prevents the heat generation during friction welding from affecting the gas generating agent.

The inventions set forth in claims 2 and 3 define the form of the upper and lower containers used in the present invention. Both the upper and lower containers are made of a double pipe structure to form a housing by butt friction welding. Only the upper container has a double pipe structure, the lower container is not a dish type with a flange, and there is the one in which the inner and outer cylinders of the upper container are joined to the bottom plate of the dish type lower container. .

The invention as set forth in claim 4 relates to the shape of the retainer ring, wherein an outer cylindrical portion continuous to the inner side of the outer peripheral edge portion, an inner cylindrical portion continuous to the inner side of the inner peripheral edge portion, and the inner and outer cylindrical portion The bottom of the lower container is U-shaped with a brim in cross section along the inner surface of the lower lid of the lower container, and by having this shape, the internal space of the gas generator is effectively utilized. It is a thing.

The invention as set forth in claim 5 relates to a retainer ring mounting means, wherein at least one of the outer peripheral edge portion and the inner peripheral edge portion of the retainer ring is bent outward downward. The retainer ring firmly presses the gas generating agent and the filter member against each other before the butt friction pressure welding.

The invention according to claim 6 relates to the structure of a retainer ring, wherein the retainer ring is formed with a communication port for equalizing the pressure inside and outside of the retainer ring. As a result, deformation of the retainer ring due to gas pressure during gas generation and deterioration of airtightness due to this are prevented.

The invention according to claim 7 is another means for preventing deformation of the retainer ring at the time of gas generation, wherein the retainer ring is divided into two parts, an inner retainer ring and an outer retainer ring. The upper container is press-fitted between the inner and outer cylinders, and is supported and fixed by the pressure contact burr of the upper container. Further, the invention according to claim 8 is one in which a cushioning material for a gas generating agent is arranged in a space portion provided between the inner and outer retainer rings to improve the vibration resistance of the gas generating agent and to reduce friction. It is designed to absorb the variation in the deviation of the upper and lower containers during pressure welding.

Further, the invention according to claim 9 is such that a space is formed between the outer peripheral surface of the filter member and the gas discharge port, thereby equalizing the pressure on the outlet side of the filter member. The combustion gas is prevented from flowing unevenly in a part of the filter member. The invention described in claims 10 and 11 relates to this space forming means, and shows a method of forming a recess on the outer surface of the filter member and a method of positioning by a retainer ring.

Further, in the invention as set forth in claim 12, a cushioning material is arranged on at least one of the upper surface and the lower surface of the gas generating agent loading portion, whereby the vibration resistance of the gas generating agent is improved. It is intended. Further, the invention according to claim 13 is one in which a ring-shaped seal member is arranged on at least one of the upper and lower surfaces of the filter member arranged in the annular chamber, and the airtightness of the upper and lower surfaces of the filter member is improved. Is. In the invention according to claim 14, a metal foil is adhered to the openings of the flame transfer orifice and the gas discharge port on the side of the annular chamber, and the metal foil is closed to maintain the airtightness of the annular space. It was done like this.

According to a fifteenth aspect of the present invention, an annular guide member is arranged in the annular chamber in the vicinity of the pressure contact portion of the inner cylinder so as to form a space surrounding the inner peripheral edge portion of the retainer ring. The purpose of the present invention is to reliably protect the gas generating agent from the pressure contact portion of the inner cylinder where the gas generating agent is most likely to be affected by heat at the time of friction welding, and to facilitate loading of the gas generating agent into the container.

According to the sixteenth aspect of the present invention, the shape of the portion of the filter member that contacts the retainer ring is formed so as to conform to the shape of the outer peripheral edge portion of the retainer ring. The airtightness of is improved.

According to the seventeenth aspect of the present invention, a positioning ring for restricting the position of the filter member is arranged along the upper lid of the combustion part loaded with the gas generating agent, whereby when the filter member is inserted. This facilitates positioning of the gas generator and facilitates gas generator assembly work.

Next, the invention according to claim 18 provides a rational assembling method in the case where the retainer ring of the gas generator is of the integral type, and has the following steps (1) to (2). It is a thing. Step of disposing the ring-shaped filter member in the upper container. A step of press-fitting an annular guide member to the outer peripheral portion of the inner cylinder in the upper container so as to form a space surrounding the pressure contact portion. A step of loading a gas generating agent between the inner and outer cylinders in the upper container. A step of press-fitting the retainer ring supporting the gas generating agent and the filter member between the inner and outer cylinders so that the inner peripheral edge portion and the outer peripheral edge portion are located inside the press contact portion. A step of joining the upper container and the lower container by abutting friction welding and joining the both containers, and supporting and fixing the inner and outer peripheral edge portions of the retainer ring with the pressure contact burrs of the inner and outer cylinders of the upper container.

The invention according to claim 19 provides a rational assembling method of the gas generator in the case where the retainer ring of the gas generator is divided into two parts, an inner part and an outer part. And has the following steps. Step of disposing the ring-shaped filter member in the upper container. 'A step of press-fitting an inner retainer ring onto the outer peripheral portion of the inner cylinder in the upper container so as to form a space surrounding the press-contact portion, so that the inner peripheral edge portion is located inside the press-contact portion. A step of loading a gas generating agent between the inner and outer cylinders in the upper container. 'A step of press-fitting the outer retainer ring supporting the filter member onto the inner surface of the outer cylinder so that the outer peripheral edge portion thereof is located inside the pressure contact portion of the outer cylinder. A step of joining the upper container and the lower container by friction welding so that both containers are joined and the inner and outer peripheral edges of the inner and outer retainer rings are supported and fixed by the pressure contact burr of the upper container.

Further, in the invention described in claim 20, in addition to the constitution of the invention described in claim 19, a cushion material is arranged on the gas generating agent after the step and the outer retainer ring in the step 'is The cushion material extends to the upper portion of the cushion material and holds it, and provides a rational method for disposing the cushion material between the inner and outer retainer rings.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an essential part showing a basic embodiment of the present invention. In FIG. 1, the housing of the gas generator comprises an aluminum upper container 1 having a double tube structure with one end closed and an aluminum lower container 4 having a double short tube structure having an opening at the center of the shaft. The central space portion and the annular chamber around the central space portion are formed by abutting friction welding of the tips of the inner and outer cylinders. A squib 18 and a transfer charge 19 are charged from below in the central space to form a central ignition chamber P. Also, in the annular chamber R,
The retainer ring 16 is fixed by abutting on the inner pressure contact burr 2b and the outer pressure contact burr 3b of the upper container 1, respectively at its inner peripheral edge portion 16d and outer peripheral edge portion 16e. In the annular chamber R sandwiched between the upper container 1 and the retainer ring 16, the gas generating agent 7 and the filter member 10 are concentrically housed to form a combustion / filter chamber R. In addition, G is a combustion part,
F indicates the filter unit, respectively.

In such a gas generator, the housing has, so to speak, a structure in which the inner pipes of the double pipes and the outer pipes are butted and frictionally welded to each other, so that the reliability of the joint strength becomes very high.
The safety of the gas generator can be increased. Further, since the frictional pressure welding work may be performed by using a means capable of holding the upper container 1 and the lower container 4 which are double pipes and pressing them while rotating them, the conventional gas as shown in FIG. The expensive welding equipment used at the time of manufacturing the generator is not required, and the manufacturing cost can be reduced.

Further, as shown in FIG. 1, the annular chamber R has a combustion section G in which the gas generating agent 7 is sequentially loaded from the inside.
And a filter member 10 for cooling generated gas and performing slag filtration are concentrically arranged, and a retainer ring 16 which can be called a common lid for both the gas generating agent 7 and the filter member 10 is provided at the time of butt friction welding. Formed upper container 1
By contacting and fixing the pressure contact burrs 2b and 3b of
It becomes possible to make the upper surface of the retainer ring 16 adhere to the filter member 10 while absorbing the error amount of the pressure contact amount at the time of frictional pressure contact, so that the airtightness in the annular chamber R can be enhanced. Further, as a result of the retainer ring 16 holding the gas generating agent 7 and the filter member 10 firmly,
Damage and pulverization due to vibration during butt friction welding or after the gas generator is mounted on the vehicle are prevented, and the performance of the gas generating agent is stably maintained for a long period of time. Further, during the butt friction pressure welding, the retainer ring 16 holds the gas generating agent 7 away from the pressure contact portion, so that the gas generating agent 7 is thermally adversely affected by the high temperature pressure contact burrs 2b and 3b. It is possible to prevent the deterioration.

The above is a description of the basic structure of the gas generator according to the present invention, and application examples and modification examples will be described below. First, for the retainer ring 16,
The flat plate shown in FIG. 1 is very easy to process and is advantageous in reducing the cost of the gas generator, but other examples are shown in FIGS. 2 to 6 and 10 to 12. In the same manner, the outer cylindrical portion 16b is continuous with the inner cylindrical portion 16b, the inner cylindrical portion 16a is continuous with the inner peripheral edge portion 16d, and the bottom portion 16c extends between the inner and outer cylindrical portions. Bottom 16
c is a cross-section with a flange U along the inner surface of the lower lid 21 of the lower container U
There are letters. In this case, as compared with the example of FIG. 1, it is possible to eliminate the useless space in the gas generator as much as possible, increase the effective volume ratio, and increase the filling amount of the gas generating agent 7 and the filter member 10. There is an advantage that a gas generator with good performance can be obtained.

Further, as shown in FIGS. 4 to 6, as the retainer ring 16, at least one of the outer peripheral edge portion 16e and the inner peripheral edge portion 16d is bent outwardly downward, and the elastic force of this bent portion is obtained. The retainer ring is press-fitted into the upper container 1 using the gas generating agent 7
Also, it becomes possible to firmly and temporarily hold these charges in the upper container 1 having the filter member 10 inserted therein, and the filter member and the gas generating agent are prevented from swinging inside during butt friction welding. This has the effect of preventing damage and pulverization of the gas generant pellets. Further, it is possible to surely protect the gas generating agent 7 from the high temperature pressure contact burrs 2b and 3b formed during the friction pressure welding so that the gas generating agent 7 is not thermally deteriorated and deteriorated or ignited. It is also expected to have the additional effect of further improving the safety of

Next, as shown in FIGS. 7 and 9 to 12,
It can be said that a preferred embodiment is that the retainer ring 16 is provided with a communication port 16f for equalizing the pressure inside and outside thereof. That is, in any of the gas generators shown in FIGS. 1 to 6, the gas pressure generated in the combustion section G during combustion largely acts on the retainer ring 16 corresponding to the thinnest wall surface in the annular chamber R. However, the retainer ring 16 may be deformed or moved by this gas pressure depending on the type of the gas generating agent 7, the combustion conditions, and the like. Should such deformation or movement occur, the end surface of the filter member 10 may be damaged. It is also expected that the airtightness will deteriorate. Therefore, as shown in the figure, a communication port 16f is provided at a position on the inner diameter side of the filter member 10 of the retainer ring 16, and during combustion, the combustion pressure circulates to the back surface of the retainer ring 16 (the lower lid 21 side), Inside and outside, that is, the gas generating agent 7 side and the lower lid 21
Retainer ring 1
It is possible to eliminate the possibility of deformation and movement of 6 and prevent deterioration of airtightness at the end surface of the filter member 10 and prevent gas from leaking between the filter member 10 and the retainer ring 16. The shape, the disposition form, etc. of the communication port 16f can be appropriately changed. For example, the retainer ring 1
As shown in FIG. 7B, which is a schematic plan view of No. 6, elongated hole-shaped communication ports 16f may be provided at equal intervals in the circumferential direction.

Further, as shown in FIGS. 9 to 12 and 14 to 20, the outer peripheral surface 10a of the filter member 10 and the gas discharge port 3 are formed.
It can be said that the one in which the space S2 is formed with a is a more preferable embodiment. That is, when the gas outlet 3a and the filter member 10 are in the positional relationship as shown in FIGS. 1 to 7, the ratio of the combustion gas passing through the filter member 10 is shown in FIG. As shown by the hatched portion in the cross-sectional view of the main part), a so-called throttling phenomenon in which the gas locally passes through the filter member toward the outlet of the gas discharge port 3a having the lowest pressure is likely to occur, and the use efficiency of the filter member 10 is increased. May decrease. Therefore, the outer peripheral surface 10 of the filter member 10
If a space S2 is formed between a and the gas discharge orifice 3a, the space S2 on the outer surface of the filter member 10 becomes a gas reservoir as shown by the hatched portion in FIG. As a result of the equalization of pressure, the influence of the throttling effect of the gas discharge port 3a is reduced, the combustion gas passes through most of the volume of the filter member 10, and the use efficiency of the filter member is improved. As a result, the filter member 10 can be downsized, and the volume reduction due to this downsizing can be applied to the space S2.
As a result, the performance can be improved without changing the dimensions of the gas generator, and the weight of the gas generator can be reduced by the weight reduction of the filter member 10.

As a method of forming the space S2, as shown in FIGS. 9 and 14, the gas discharge port 3a of the filter member 10 is formed.
A recess is formed in the portion facing the gas discharge port,
The filter member 10 may be arranged so as to face a. According to the method of forming the space S2 as described above, there is an advantage that the filter member 10 can be easily placed in the annular chamber R at the time of assembling the gas generator, and can be easily stabilized.

As another method of forming the space S2, as shown in FIGS. 10 to 12, the lower end of the filter member 10 is held by a retainer ring 16 so as to be spaced apart from the outer cylinder 3 of the upper container 1. You may comprise. In this configuration, since the filter member 10 having a simple cylindrical structure can be used, there is an advantage that the filter member 10 can be easily manufactured and the loading amount of the filter member 10 can be increased.

Next, another embodiment in which the retainer ring shown in the above-mentioned embodiment is divided into an inner portion and an outer portion will be described. That is, the retainer ring is replaced with the one shown in FIGS.
2, the inner retainer ring 31 supported and fixed to the pressure contact burr 2b of the inner cylinder 2 of the upper container 1 and the outer cylinder 3 of the upper container 1
Outer retainer ring 3 supported and fixed to the pressure contact burr 3b
It is divided into 2 and 2, and each is press-fitted into the upper container 1.

In the case of the gas generator shown in FIGS. 1 to 6,
As described above, in any case, the combustion pressure in the combustion section G largely acts on the retainer ring 16 corresponding to the thinnest wall surface in the annular chamber R, but the type of the gas generant 7, the combustion conditions, etc. It is expected that the retainer ring 16 may be deformed or moved, and if such deformation or movement occurs, the airtightness of the upper and lower end surfaces of the filter member 10 is reduced,
The gas leaks from the gaps formed on the upper and lower surfaces of the filter member 10, and the use efficiency of the filter member may be extremely reduced. Therefore, by dividing the retainer ring into two parts so that part of the bottom part is separated,
This is intended to prevent deformation and movement of the retainer ring due to combustion pressure. In addition, the inner retainer ring 31
Plays a role of a guide when the gas generating agent 7 is loaded in the annular chamber R, and at the same time protects the gas generating agent 7 from the high temperature of the inner pressure contact burr 2b.

Further, in FIGS. 13 to 17, the gas generating agent 7 is provided at a portion of the space m provided between the inner and outer retainer rings 31 and 32.
It shows an example of arranging a cushion material 9 for use.
By arranging such a cushion material 9, even if there is some variation in the margin of deviation of the upper and lower containers at the time of frictional pressure welding, the cushion material 9 can absorb that amount of contraction.
Further, since the cushion material 9 is located in the central portion, the cushion effect thereof acts uniformly on the entire gas generant 7.

Further, as shown in FIGS. 1 to 6 and 9 to 12,
It is also possible to dispose the cushioning materials 8 and 9 on at least one of the upper surface and the lower surface of the loading portion of the gas generating agent 7, and in this way, the gas generating agent 7 is provided from above and below by the cushioning materials 8 and 9. By sandwiching and fixing, it is possible to prevent the surface of the gas generating agent from being damaged or powdered and being deteriorated by the influence of vibration etc. over many years while running after being mounted on the vehicle. It is possible to maintain stable performance of the gas generator.

The cushion material 9 is preferably any of the following (a) to (c). (A) Two layers of ceramic fiber and aluminum foil, arranged so that the aluminum foil is located on the gas generating agent side. (B) Wire mesh. (C) A wire mesh, a ceramic fiber, and three layers of aluminum foil, which are arranged so that the aluminum foil, the ceramic fiber, and the wire mesh are located in this order from the gas generating agent side.

That is, if a ceramic fiber having a high heat resistance and resistant to deterioration is used as the cushion material 9, and an aluminum foil is laid on the surface of the ceramic fiber so as to come into contact with the gas generating agent 7, when the butt friction welding is performed. By the approaching movement of the upper and lower containers, the aluminum foil is deformed along the surface uneven shape of the gas generating agent pellet, and the shape is held by the ceramic fiber as the cushion material.
Even if there is an external stimulus such as vibration after the vehicle is mounted, the movement and swing of the gas generating agent inside the gas generator are suppressed, and damage to the gas generating agent is prevented. If a wire mesh is used as the cushion material 9, a gas cooling effect can be expected in addition to the cushion effect, and it is possible to reduce the size and weight of the filter member 10. Further, if the cushion material 9 is made of three layers of aluminum foil, ceramic fiber, and wire mesh in order from the gas generating agent 7 side, it is possible to secure the synergistic effect of both (a) and (b). it can.

In addition to the structure of the gas generator according to any of the above-described embodiments, as shown in FIGS. 1 to 6 and 9 to 20, the flame transfer orifice 2a and the gas discharge port 3a are respectively provided. The metal foils 14 and 15 may be attached to the opening on the side of the annular chamber R to close both openings. In this way metal foil 1
The gas generating agent 7 can be protected from moisture and protected from deterioration by a simple means of sticking 4, 15 together.

In addition, the metal foil 14 is designed so that the metal foil 14 at the gas discharge port 3a bursts after the internal pressure of the container reaches a predetermined value during combustion, so that the combustion pressure is adjusted, that is, the combustion speed is adjusted. Can be performed easily, and as a result, it becomes possible to provide a highly versatile gas generator that can use a wide variety of gas generating agents. Further, in combination with the sealing effect between the filter member 10 and the outside due to the adhesion of the metal foils 14 and 15, and the effect of improving the airtightness of the combustion part G by the retainer ring 16 being fixed by the pressure contact burrs 2b and 3b. It is possible to increase the airtightness of the entire gas generator. As a result, in order to ensure the airtightness as in the conventional case, a partition member between the combustion part and the filter part, a support member for the filter member, etc. It is possible to easily increase the airtightness of the entire gas generator without taking any improvement means by a complicated structure such as newly provided. Therefore, it is necessary to provide a gas generator for an air bag that is safe, has good performance, and is versatile, while being able to satisfactorily adjust the combustion pressure while meeting the demands for downsizing, weight reduction, and cost reduction of the gas generator. Is possible.

In addition to the structure of the gas generator according to any of the above-described embodiments, for example, as shown in FIGS.
The ring-shaped sealing members 11 and 12 may be arranged on at least one of the upper and lower surfaces of the filter member 10 arranged in the annular chamber R. By interposing such sealing members 11 and 12, the airtightness at the filter mounting and fixing portion can be made almost perfect.

Further, as shown in, for example, FIGS. 5 and 6, the retainer ring 16 is provided in the annular chamber R in the vicinity of the pressure contact portion of the inner cylinder 2.
It is also possible to arrange the annular guide member 17 so as to form a space S1 surrounding the inner peripheral edge portion 16d. By disposing such an annular guide member 17, the gas generating agent 7 can be completely shielded from the high temperature generated at the time of friction welding of the inner cylinder, and the influence of the friction welding heat of the gas generating agent can be completely prevented. . On the other hand, at the time of assembling the gas generator, the ring-shaped space S1 for removing the gas generating agent 7 can be secured, so that the retainer ring 16 is attached to the annular guide member 1 thereof.
By simply pushing along 7, it is possible to easily wear the gas generating agent 7, the cushion material 9 and the filter member 10 on the three members, which facilitates the assembly work of the gas generator.
It can contribute to the reduction of manufacturing cost.

In addition, as shown in FIGS. 2 to 5, 13 and 14, the shape of the portion of the filter member 10 that contacts the retainer ring 16 is defined by the outer peripheral edge portion 16e of the retainer ring 16.
Therefore, it is also possible to follow the shape of the outer cylindrical portion 16b continuous with this. Thereby, the positioning of the filter member 10 can be facilitated, and at the same time, the airtightness of the upper and lower end surfaces of the filter member can be enhanced.

Further, as shown in FIG. 6, the inner diameter of the outer cylinder 6 of the lower container 4 is set to the outer cylinder 3 having the gas discharge port 3 a of the upper container 1.
It is also a modified example that it is effective to make the inner diameter larger than the inner diameter.
By expanding the diameter in this way, it is possible to expand the space of the radially outer corner in the lower part of the annular chamber R, and this space can be used as a space generated near the outer end 16e of the retainer ring 16, so It is possible to effectively use the entire space of the container 1 as a filling space for the gas generating agent 7 and the filter member 10. In addition, although the housing structure on the lower side of the gas generator is slightly enlarged due to the diameter expansion, the portion to be expanded is located below the gas generator mounting flange and is not inserted inside the airbag. It does not lead to an increase in the volume of the module itself, and no particular problems occur.

Further, as shown in FIGS. 12 and 17, a positioning ring 33 for restricting the position of the filter member 10 may be arranged along the upper lid 20 of the combustion section G loaded with the gas generating agent 7. As a result, the filter member 10 can be positioned quickly and accurately, and the gas generator can be easily assembled.

The above example is an example in which both the upper and lower containers have inner and outer cylinders, and the end faces thereof are butted and frictionally welded to each other to form a housing, but FIG. 21 shows only the upper container. There is an example when there is. In the figure, the structure of the upper container 1 is a structure in which the inner cylinder 2 is fixed by friction welding 2d to the central part of the container having a concave cross section having the outer cylinder 3, and the structure of the lower container 4 is the central part. Is a dish-shaped container having an ignition device charging port 60 at its periphery and a cylindrical portion 4b and a flange 4c at its peripheral portion, and the end surfaces of the inner and outer cylinders 2 and 3 of the upper container 1 are attached to the lower lid portion 21 of the lower container 4. Friction pressure welding is performed. It goes without saying that the above-described various embodiments of the present invention can be applied to the housing having such a structure.

Next, an example of the method of assembling the gas generator of the present invention will be described by taking the embodiment shown in FIG. 6 as an example. First, an aluminum foil 14 for closing the gas discharge port 3a is attached to the inner peripheral surface of the outer cylinder 3 of the upper container 1 having a bottomed double tube structure, and the inner cylinder 2
After the aluminum foil 15 for closing the fire transfer orifice 2a is adhered also to the outer peripheral surface of the above, the upper container 1 is fixed on a predetermined pedestal such that its opening faces upward. Next, in the annular space R, a cylindrical filter member 10 having seal members 11 and 12 attached to both end surfaces from above (downward in the drawing) in advance is loaded along the inner peripheral surface of the outer cylinder 3, The ring-shaped cushion member 8 is laid on the inner surface of the upper lid 20, and then the stepped short tube-shaped guide member 17 is fitted to the stepped portion 2c of the inner tube 2 with its small diameter side facing down. After that, loading of the gas generating agent 7 into the space between the filter member 10 and the inner cylinder 2 is started, and the loading amount of the gas generating agent 7 is the height of the upper end of the guide member 17 (the upper end of the seal member 12 and The loading of the gas generating agent 7 is continued until it reaches the same or slightly lower position. At this time, the guide member 17 also serves as a guide for loading the gas generating agent.

When the charging of the gas generating agent 7 is completed, the ring-shaped cushion member 9 is arranged on the surface, and then the retainer ring 16 and the outer cylindrical portion 16b of the retainer ring 16 are arranged.
While the inner cylindrical portion 16a is arranged along the outer peripheral surface of the guide member 17 along the inner peripheral surface of the guide member 17, the outer peripheral edge portion 16e and the inner peripheral edge portion 16d are press-fitted until they are located inside the press contact portion. Next, the transfer charge 19 enclosed in a predetermined thin container is charged into the central space, and subsequently, the lower container 4 with a bottomed double short tube structure to which the squib 18 is attached in advance is referred to as the inner cylinder 5 thereof. Outer cylinder 6
The inner cylinder 2 and the outer cylinder 3 of the upper container 1 are brought into contact with each other, and the lower container 4 is gripped with respect to the upper container 1 fixed in this state and is rotated at a predetermined pressure. While pushing in. As a result, the contact surface is melted by frictional heat, and the upper container 1 and the lower container 4
Butt friction welding is completed. At the end point, the outer peripheral edge portion 16e and the inner peripheral edge portion 16d of the retainer ring 16 receive a force such that they are pushed into the upper container by the pressure contact burrs 3b and 2b of the upper container 1 in the circumferential direction and are held and fixed by the pressure contact burrs. It is in the state of being Thus, the assembly work of the gas generator is completed.

Next, another example of another method of assembling the gas generator will be described by taking the embodiment shown in FIG. 19 as an example. First, an aluminum foil 14 for closing the gas discharge port 3a is attached to the inner peripheral surface of the outer cylinder 3 of the upper container 1 having a bottomed double tube structure, and the inner cylinder 2
After the aluminum foil 15 for closing the fire transfer orifice 2a is adhered also to the outer peripheral surface of the above, the upper container 1 is fixed on a predetermined pedestal so that its opening faces upward. Next, the cylindrical filter member 10 is inserted into the annular space portion from above so that the outer peripheral surface of the lower portion (the upper portion in the drawing) of the cylindrical member contacts the stepped inner peripheral surface 3b of the outer cylinder 3. The filter member 10
Sealing members may be previously attached to both upper and lower end surfaces of the. Next, the outer retainer ring 32 is attached to the outer cylindrical portion 32.
While b is along the outer peripheral surface of the filter member 10, the outer peripheral edge portion 32e is press-fitted so as to be located inside the press-contact portion. Subsequently, the inner retainer ring 31 is fitted to a predetermined position on the inner cylindrical wall 2 so that the inner peripheral edge portion 30d faces downward (upward in the figure) and is located inside the press contact portion. After that, loading of the gas generating agent 7 into the space between the filter member 10 and the inner cylinder 2 is started. At this time,
A ring-shaped cushion material may be laid on the inner surface of the upper lid 20 in advance. After that, when the amount of the gas generating agent becomes close to the upper end of the filter member 10, the loading is finished, and the ring-shaped cushion member 9 is arranged on the upper surface thereof. At this time, the upper surface of the cushion material 9 is made to project slightly from the upper surface of the filter member 10.

Next, the transfer charge 1 enclosed in a predetermined thin container.
9 into the central space, and then, the lower container 4 with a bottomed double short tube structure to which the squib 18 is previously attached is attached to the inner cylinder 5 thereof.
The outer cylinder 6 and the outer cylinder 6 are brought into contact with each other by the annular tip surfaces of the inner cylinder 2 and the outer cylinder 3 of the upper container 1, respectively, and the lower container 4 is gripped with respect to the upper container 1 fixed in this state and a predetermined pressure is applied. Push in while rotating. As a result, the contact surface is melted by frictional heat, and the butt friction welding of the upper container 1 and the lower container 4 is completed. At the end,
The outer peripheral edge portion 32e of the outer retainer ring 32 and the inner peripheral edge portion 31d of the inner retainer ring 31 are in close contact with the pressure contact burrs 3b, 2b of the upper container 1 in the circumferential direction and the pressure contact burr 3
It is in a state of being pressed by b and 2b. Thus, the assembly work of the gas generator is completed.

[0053]

The greatest feature of the invention according to claim 1 of the present invention is that the retainer ring, which can be said to be a so-called common lid for both the gas generating agent and the filter member, is formed on the upper container during butt friction welding. Since the pressure contact burr is brought into contact with and fixed to the burr, the gas generating agent and the filter member, which are the built-in components, are firmly held by the retainer ring held and fixed by the burr. As a result, due to vibrations during traveling after the gas generator is mounted on the vehicle, the gas generant will not rock and break or powder in the container.
The performance of the gas generating agent can be stably maintained for a long period of time. At the same time, the upper surface of the retainer ring can be brought into close contact with the filter member while absorbing the error amount of the pressure contact amount at the time of frictional pressure contact, and the airtightness of the annular chamber can be improved, compared to the conventional gas generator. It is possible to further improve the combustion pressure adjusting ability. Further, since the retainer ring can block the gas generating agent and the filter member from the high-temperature pressure contact burr, they can be prevented from being deteriorated due to a thermal adverse effect.

Next, according to the second aspect of the present invention, the upper and lower containers have a double tube structure with a lid having inner and outer cylindrical end surfaces, which facilitates positioning during butt friction welding.
Further, in claim 3, only the upper container has a double tube structure with a lid,
Since the lower container is dish-shaped, the lower container can be easily manufactured and the housing cost can be reduced.

Next, in the invention according to claim 4, by adopting a U-shaped retainer ring having a brim-shaped cross section, the useless space in the lower container is reduced and the effective volume ratio of the entire container is increased. It is possible to increase the amount of the gas generating agent and the amount of the filter member charged, and it is possible to reduce the size and weight of the gas generator.

Next, according to the invention of claim 5, since the retainer ring is press-fitted into the upper container, the retainer ring before the butt friction welding does not temporarily hold the gas generating agent and the filter member. It becomes strong, and it is possible to reliably prevent the gas generating agent from being damaged or pulverized due to vibration generated during friction welding. Further, in the invention according to claim 6, a communication port is provided in a part of the retainer ring,
When burning, the gas pressure goes around to the back of the retainer ring,
Since the inside and outside of the retainer ring are pressure-equalized, deformation and movement of the retainer ring due to gas pressure are prevented, and deterioration of airtightness at the end surface of the filter member can be prevented.

Next, in the invention according to claim 7, since the retainer ring is divided into two and a part of the bottom part is separated, the generated gas easily flows around the back surface of the retainer ring during combustion. Therefore, there is no risk of deformation or movement of the retainer ring, and it is possible to prevent deterioration of airtightness at the end surface of the filter member. Further, the presence of the inner retainer ring securely protects the gas generating agent from the high temperature press contact burr formed during friction welding so that the gas generating agent is not adversely affected by heat and is not deteriorated or ignited. The safety of the gas generator can be further enhanced. Further, the inner retainer ring serves as a guide when charging the gas generating agent into the annular chamber, and is expected to effectively act in terms of the gas generator assembly work efficiency.

Next, according to the invention described in claim 8, since the cushioning material for the gas generating agent is arranged between the inner and outer retainer rings, even if there is some variation in the deviation of the upper and lower containers during friction welding. There is an advantage that the cushion material can absorb the amount of shrinkage. Further, as a result of the cushion material being arranged substantially in the center, the cushioning effect acts uniformly on the gas generating agent. Furthermore, by holding the gas generant through a cushioning material, damage and pulverization of the gas generant due to vibration etc. over many years after being mounted on the vehicle are prevented, and the performance of the gas generator is kept stable for a long period of time. Will be done.

Next, in the ninth aspect of the invention, since the constant space S2 is formed between the outer peripheral surface of the filter member and the gas discharge orifice, the gas pressure on the filter outlet side is equalized. To prevent local gas drift in the filter member and improve the use efficiency of the filter member. As a result, it is possible to reduce the size and weight of the filter member.

Next, according to the tenth aspect of the present invention, since the structure of the filter member itself holds the space S2, no special component for forming the space is required, and therefore the annular shape is obtained. There is an effect that it is possible to increase the stability of the loading arrangement of the filter member in the room. According to the eleventh aspect of the present invention, since the space S2 is formed by the shape of the retainer ring, the filter member may have a simple cylindrical structure, which is easy to manufacture and the filter member. It is possible to increase the charging amount of.

Next, in the twelfth aspect of the invention, since the cushioning material is arranged on the upper and lower surfaces of the gas generating agent, the gas generating agent pellet is damaged by vibration after the gas generator is mounted on the vehicle. It is possible to prevent dusting or pulverization, and it is possible to stably maintain the quality of the gas generating agent for a long period of time.

In the thirteenth aspect of the invention, since the seal members are arranged on the upper and lower surfaces of the filter member, the airtightness of the filter fixing portion can be made almost perfect. As a result, the airtightness of the combustion chamber can be more surely improved.
It can be remarkable, and the combustion pressure can be adjusted, that is, the combustion speed can be adjusted more appropriately.

Next, in the fourteenth aspect of the present invention, the deterioration of the gas generating agent is prevented and a wide variety of gas generating agents are prevented by a simple means of attaching a metal foil to the fire transfer orifice and the gas discharge port. Since it can be used as a highly versatile gas generator and the combustion pressure can be easily adjusted, it provides a safe, high-performance and versatile airbag gas generator. Things are possible.

Next, in the fifteenth aspect of the present invention, the annular guide member 17 is arranged in the annular chamber in the vicinity of the pressure contact portion of the inner cylinder so as to form the space S1 surrounding the inner peripheral edge portion of the retainer ring. Therefore, when assembling the gas generator, it is possible to secure a ring-shaped space for excluding the gas generating agent, and by simply pushing the retainer ring along the annular guide member, the gas generating agent, its cushion material, and the filter member. It is possible to easily attach the gas generator to the three members, the assembly work of the gas generator is facilitated, and the manufacturing cost can be reduced.

Next, according to the sixteenth aspect of the present invention, since the shape of the portion of the filter member contacting the retainer ring is formed so as to conform to the shape of the outer peripheral edge portion of the retainer ring, the end surface of the filter member is Airtightness is maintained and the filter member can be easily attached. Further, in the invention of claim 17, since the positioning ring for restricting the position of the filter member is arranged along the upper lid of the combustion part loaded with the gas generating agent,
You can position the filter member quickly and accurately,
Workability of assembly work is improved.

Next, according to the assembling method described in claims 18 to 20, there is no need for expensive welding equipment used in assembling a conventional gas generator, and the upper container and the lower container which are double pipes are used. Since it is sufficient to perform the frictional pressure welding work in which the containers are gripped with each other and rotated and pressed, it is possible to reduce the manufacturing cost.
Furthermore, since the retainer ring for holding the filter member and the gas generating agent in the container is fixed by utilizing the burr generated at the time of friction welding, it is possible to use the gas generating agent without using a special structure. It becomes possible to easily and reliably fix the filter member in the container. At the same time, the burr can be used to increase the airtightness of the annular chamber, which makes it easier to adjust the combustion pressure compared to conventional gas generators, and makes it possible to obtain a gas generator with high versatility. It will be possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a basic embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing an example of a gas generator using a retainer ring having another shape according to the present invention.

FIG. 3 is a cross-sectional view of essential parts showing an example in which a seal member is arranged on upper and lower end surfaces of a filter member of the gas generator shown in FIG.

FIG. 4 is a cross-sectional view of essential parts showing an example in which another retainer ring tip portion is arranged in the gas generator shown in FIG. 3, and FIG. 4 (a) is a burr obtained by bending only the tip portion of the inner tubular portion of the retainer ring. The figure which shows the structural example contacted, (b) is a partial view which shows the structural example which also bent the front-end | tip part of the outer cylinder part of the same member simultaneously, and was contact | abutted to the burr.

5 is a cross-sectional view of essential parts showing an example in which an annular ring member is arranged at a bent portion of a tip of a retainer ring of the gas generator shown in FIG.

FIG. 6 is a cross-sectional view of essential parts showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view of an essential part showing still another embodiment of the present invention.

FIG. 8 is a cross-sectional view of an essential part for explaining a passing state of combustion gas in a filter member.

9 is a cross-sectional view of essential parts showing an example in which a space is formed between the filter member and the gas discharge orifice of the gas generator shown in FIG.

10 is a cross-sectional view of essential parts showing an example in which a U-shaped retainer ring with a cross section is adopted as the retainer ring of the gas generator shown in FIG. 9 and a similar space is formed.

11 is a cross-sectional view of a main part showing a modified example of the gas generator shown in FIG.

12 is a cross-sectional view of essential parts showing an example in which a positioning ring for restricting the position of a filter member is arranged in the gas generator shown in FIG.

FIG. 13 is a cross-sectional view of essential parts showing still another embodiment of the present invention.

14 is a cross-sectional view of main parts showing an example in which a space is formed between the filter member and the gas discharge orifice of the gas generator shown in FIG. 13, and is a view corresponding to FIG. 9.

15 is a cross-sectional view of essential parts showing a gas generator having a shape different from the shape of the space of the gas generator shown in FIG.

16 is a cross-sectional view of essential parts showing another gas generator having a different space shape, like the gas generator shown in FIG. 15.

17 is a cross-sectional view of essential parts showing an example in which a positioning ring for restricting the position of the filter member is arranged in the gas generator shown in FIG.

FIG. 18 is a cross-sectional view of essential parts showing a structure in which an outer retainer ring of the gas generator shown in FIG. 16 extends to an upper portion of a cushion material.

19 is a cross-sectional view of essential parts showing a retainer ring of the gas generator shown in FIG. 18 in which a communication port is formed.

20 is a cross-sectional view of essential parts showing an example of a cushioning material of the gas generator shown in FIG. 19 in which an aluminum foil layer is formed on the gas generating agent side.

FIG. 21 is a cross-sectional view of essential parts showing an example of a gas generator according to the present invention when the lower container has a dish shape.

FIG. 22 is a schematic partial cross-sectional view showing a conventional air bag gas generator having a two-chamber structure.

[Explanation of symbols]

1 Upper Vessel 2 Inner Cylinder of Upper Vessel 2a Fire Transfer Orifice 3 Outer Cylinder of Upper Vessel 3a Gas Release Orifice 4 Lower Vessel 5 Inner Cylinder of Lower Vessel 6 Outer Cylinder of Lower Vessel 7 Gas Generating Agent 8, 9 Cushion Member 10 Filter member 11, 12, 13 Seal member 14, 15 Aluminum foil 16 Retainer ring 16a Retainer ring inner cylinder wall 16b Retainer ring outer cylinder wall 16c Retainer ring bottom 16d Retainer ring inner peripheral edge 16e Retainer ring outer peripheral edge 16f Retainer ring communication port 17 Annular guide member 18 Squib 19 Transfer charge 31 Inner retainer ring 32 Outer retainer ring 33 Positioning ring F Filter placement part G Combustion part P Ignition chamber R Annular chamber S1 Near the inner cylinder pressure contact part Formed space S2 filter member outer surface Space formed between the gas discharge orifice

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Somune 3903-39, Abundant Town, Himeji City, Hyogo Prefecture, Himeji City, Nihon Kayaku Co., Ltd. Himeji Plant Sensor Technology Co., Ltd., Himeji Technical Center (72) Inventor, Norihisa Miyamoto Hyogo 3903-39 Abundant, Toyotomi-cho, Himeji-shi, Japan Sensor / Technology in Nippon Kayaku Co., Ltd. Himeji Technical Center (72) Inventor Akihiko Kuroiwa 3903-39 Abundant in Toyotomi-cho, Himeji-shi, Hyogo Nippon Kayaku Co., Ltd. Himeji In-plant sensor technology Himeji Technical Center Co., Ltd.

Claims (20)

[Claims] 1. An upper container (1) and a lower container (4) are joined by friction welding, and an inner cylinder located in the central part of the container is provided with a central ignition chamber (P) inside the inner cylinder, An annular chamber (R) outside the inner cylinder is defined, an ignition device is arranged in the central ignition chamber (P), and a gas generating agent (7) is provided in the annular chamber (R).
And a filter member (10) are arranged, the central ignition chamber (P) and the annular chamber (R) are communicated with each other through a fire transfer orifice (2a) formed in the inner cylinder, and the generated gas is discharged to the outside. A gas generator for an airbag having a two-chamber structure in which a gas discharge port (3a) for discharging is provided in an outer cylinder of the container, wherein the gas generating agent (7) and the gas generating agent (7) are provided in the annular chamber (R). Retainer ring (16) supporting the filter member (10)
The inner peripheral edge (16d) and the outer peripheral edge (16e)
Is arranged so as to be supported and fixed by the pressure contact burr (2b, 3b) of the upper container (1). 2. The upper and lower containers (1, 4) each have an outer cylinder part (3, 6) and an inner cylinder part (2, 5), and the end faces of the inner and outer cylinders are abutted against each other by friction welding. The gas generator for an air bag according to claim 1, wherein 3. The upper container (1) has an outer cylinder part (3) and an inner cylinder part (2) attached by joining, and the lower container (4) has a flange part (4c). ), A tubular part (4b) and a lower lid (21), the outer container end surface or outer cylinder side surface and the inner tube end part of the upper container being the lower container (4).
The gas generator for an air bag according to claim 1, which is joined to the gas generator. 4. The outer ring portion (16b), wherein the retainer ring (16) is continuous inside the outer peripheral edge portion (16e),
Inner cylinder part (16a) continuous inside the inner peripheral edge part (16d)
And a bottom portion (16c) between the inner and outer cylindrical portions, and the bottom portion (16c) has a U-shaped cross-section with a flange so as to follow the inner surface of the lower lid (21) of the lower container (4). The gas generator for an airbag according to any one of claims 1 to 3, which is a gas generator. 5. A tip of at least one of an outer peripheral edge portion (16e) and an inner peripheral edge portion (16d) of the retainer ring (16) is bent outward downward and press-fitted inside the upper container (1). The gas generator for an air bag according to claim 4, wherein: 6. A communication port (16) for equalizing the pressure inside and outside the retainer ring (16).
The gas generator for an air bag according to any one of claims 1 to 5, wherein f) is formed. 7. The inner retainer ring (31), wherein the retainer ring is supported and fixed to the pressure contact burr (2b) of the inner cylinder (2) of the upper container (1), and the outer cylinder (3) of the upper container (1). The outer retainer ring (32) supported and fixed to the pressure contact burr (3b) of (1) is divided into two parts, each of which is press-fitted into the upper container (1). The gas generator for an air bag according to any one of claims. 8. The inner and outer retainer rings (31, 32)
The gas generator for an air bag according to claim 7, wherein a space (m) is provided between the space and the space, and a cushion material (9) for a gas generating agent is arranged in the space. 9. A space (S) is provided between the outer peripheral surface of the filter member (10) and the gas discharge orifice (3a).
The gas generator for an air bag according to any one of claims 1 to 8, wherein 2) is formed. 10. A recess (10a) is formed at a portion of the filter member (10) facing the gas discharge orifice (3a), and the space (S2) is formed by the recess. Item 9. A gas generator for an airbag according to Item 9. 11. The space (S2) is formed by holding the lower end of the filter member (10) with the outer ring (3) of the upper container (1) spaced apart by the retainer ring. The gas generator for an airbag according to claim 9, wherein 12. The cushioning material (9) is arranged on at least one of the upper surface and the lower surface of the gas generating agent (7) charging portion, and the cushioning material (9) is arranged in any one of claims 1 to 7 and 9 to 11. Gas generator for airbags. 13. The ring-shaped seal member (11, 12) is arranged on at least one of the upper and lower surfaces of the filter member (10) arranged in the annular chamber (R). The gas generator for an airbag according to. 14. A metal foil (14, 1) is formed on the inner surface of the gas discharge port (3a) and the inner and outer surfaces of the fire transfer orifice (2a).
The gas generator for an air bag according to any one of claims 1 to 13, wherein 5) is attached. 15. An annular shape (S1) is formed in the annular chamber (R) in the vicinity of the pressure contact portion of the inner cylinder (2) so as to surround the inner peripheral edge portion (16d) of the retainer ring (16). The gas generator for an airbag according to any one of claims 1 to 14, wherein a guide member (17) is arranged. 16. The shape of a portion of the filter member (10) which is in contact with the retainer ring (16) is formed so as to follow the shape of an outer peripheral edge portion (16e) of the retainer ring (16). The gas generator for an air bag according to any one of claims 1 to 15. 17. A filter member (10) along an upper lid (20) of a combustion section (G) loaded with the gas generating agent (7).
The gas generator for an air bag according to any one of claims 1 to 16, wherein a positioning ring (33) for restricting the position of is arranged. 18. A central ignition chamber (P) inside the inner cylinder and an annular chamber outside the inner cylinder, wherein the upper container and the lower container are frictionally pressure-bonded and joined to each other by an inner cylinder located at a central portion in the container. (R), an ignition device is disposed in the central ignition chamber, a gas generating agent (7) and a filter member (10) are disposed in the annular chamber, and the central ignition chamber (P) is disposed. And a circular chamber (R) are connected to each other. A fire transfer orifice (2a) is formed in the inner cylinder, and a gas discharge port (3a) for discharging generated gas to the outside is provided in the outer cylinder of the container. A method of assembling a gas generator for an air bag having a structure, comprising the following steps (1) to (3): In the upper container (1), a ring-shaped filter member (1
0) placing step. A step of press-fitting an annular guide member (17) to the outer peripheral portion of the inner cylinder (2) in the upper container (1) so as to form a space (S1) surrounding the pressure contact portion. A step of loading the gas generating agent (7) between the inner and outer cylinders (2, 3) in the upper container (1). The gas generating agent (10) and the filter member (10)
A step of press-fitting the retainer ring (16) for supporting the inner ring and the outer ring so that the inner peripheral edge portion (16d) and the outer peripheral edge portion (16e) are located inside the press contact portion. The upper and lower containers (1) and (4) are joined together by bringing the end faces of the inner and outer cylinders into contact with each other and frictionally welding them together, and the retainer ring (16) has inner and outer peripheral edges (1).
6d, 16e) is supported and fixed by the pressure contact burrs (2b, 3b) of the inner and outer cylinders of the upper container (1). 19. A central ignition chamber (P) inside the inner cylinder and an annular chamber outside the inner cylinder, wherein an upper cylinder and a lower container are frictionally pressure-bonded to each other and joined by an inner cylinder located at a central portion of the inner cylinder. (R), an ignition device is disposed in the central ignition chamber, a gas generating agent (7) and a filter member (10) are disposed in the annular chamber, and the central ignition chamber (P) is disposed. And a circular chamber (R) are connected to each other. A fire transfer orifice (2a) is formed in the inner cylinder, and a gas discharge port (3a) for discharging generated gas to the outside is provided in the outer cylinder of the container. A method of assembling a gas generator for an air bag having a structure, comprising the following steps (1) to (3): In the upper container (1), a ring-shaped filter member (1
0) placing step. 'In the outer peripheral portion of the inner cylinder (2) in the upper container (1),
An inner retainer ring (31) is formed so as to form a space (S1) surrounding the pressure contact portion, and an inner peripheral edge portion (31d) thereof.
However, the step of press-fitting so that it is located inside the press-contact portion. A step of loading the gas generating agent (7) between the inner and outer cylinders (2, 3) in the upper container (1). 'The outer retainer ring (32) supporting the filter member (10) is press-fitted into the inner surface of the outer cylinder (3) so that the outer peripheral edge portion (32e) is located inside the pressure contact portion of the outer cylinder (3). The process of doing. The upper and lower containers (1) and (4) are joined together by abutting the end faces of the inner and outer cylinders against each other and friction-welding the inner and outer retainer rings (31, 32) to the inner and outer peripheral edges (16d, 16e). Is supported and fixed by the pressure contact burr (2b, 3b) of the inner cylinder of the upper container (1). 20. A cushioning material (9) is disposed on the gas generating agent (7) after the step, and the outer retainer ring (32) in the step 'is formed by the cushioning material (9).
Claim 1 which extended to the upper part of and held it.
9. The method for assembling the gas generator for an air bag according to 9.