JPH09226506A - Gas generator for air bag and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble a gas generator with a simple structure and a good work efficiency and reduce a production cost. SOLUTION: An inner cylinder 3 having gas generation agents 2 and gas passing holes 3 and a filter member 4 are stored in order from an axial center side toward a diameter direction outside in a cylindrical outer cylinder 6 having orifices 6a for discharging gas and also a cover member 9 providing an ignition tool 8 and a fire conveying agent 10 is installed on the one end of the axial direction of the outer cylinder 6 by a butting friction welding and the brim part 7a of the cap member 7 with brim of the cover member 9 is extended along the end surfaces of the inner cylinder 3 and filter member 4. While, a cap main body projection part having a through hole 7d for passing an ignition flame is inserted along the inner surface of the inner cylinder 3 and a fire conveying agent holding function and the function for pressing the fire conveying agent 10, inner cylinder 3 and filter member 4 in an axial direction in a single operation are kept jointly on the cap member 7.

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 air bag system of an automobile, and more particularly to a large capacity gas generator mainly used in a passenger side air bag system.

[0002]

2. Description of the Related Art A conventional gas generator for an air bag of this type (hereinafter, simply referred to as "gas generator") is shown in FIG.
And the one shown in FIG. 3 is known. The outline will be described with reference to the drawings. First, FIG.
It is sectional drawing of the gas generator disclosed by the publication. In this gas generator, a flame transfer agent and a member 31 supporting the transfer agent, a gas generating agent 32, and a flow of gas generated by holding the transfer agent are radially outward from a shaft center in a housing 35 having one end closed. A cylindrical member 33 and a filter member 34 that regulate the above are stacked and arranged. Further, the cylindrical member 33 is provided with a plurality of gas passage holes along the axial direction at predetermined intervals, and the housing 35 is also provided with a plurality of gas discharge orifices in the same manner. The passage hole and the gas discharge orifice are arranged so as to be offset from each other in the radial direction. Further, in order to fix each component in the axial direction, a disc-shaped member 36 for pressing each component and an end portion of the housing 35 are formed at the open end of the housing 35, and a lid member 37 for holding an igniter. Is attached. Further, the explosive for causing the function as an automatic ignition device for ensuring the prevention of an explosion accident in a high temperature environment, a so-called autoignition agent 38, is a portion that can more reliably exhibit the function, for example. It is arranged at the bottom of the housing 35. Then, the gas generated by the combustion of the gas generating agent 32 passes through the gas passage hole of the cylindrical member 33 holding the gas generating agent 32, passes through the filter member 34, and is discharged from the gas discharge orifice of the housing 35. As a result, it is disclosed that the gas is discharged almost uniformly over the entire length of the gas generator.

FIG. 3 is a sectional view of the gas generator disclosed in Japanese Patent Laid-Open No. 7-52743. This gas generator is characterized in that an ignition mechanism 46 is arranged corresponding to the gas generating agent 43 at one end of the housing 42 accommodating the gas generating agent 43 and the gas cooling collecting material 45. It is disclosed that parts such as the transfer agent holding member 31 shown in 2 are unnecessary and the structure can be simplified and the manufacturing cost can be reduced.

[0004]

However, in the conventional gas generator shown in FIG. 2, the transfer agent holding member 31 is arranged so as to penetrate through the center of the gas generating agent storage portion in the axial direction. Therefore, at the time of assembly, the gas generating agent 32 has to be charged into the elongated annular space portion, which makes the work very complicated. Further, since the method of arranging the auto ignition agent 38 at the bottom of the housing 35 is adopted,
At the time of assembling the gas generator, the peripheral parts of the housing 35 to which the auto-ignition agent 38 is attached must be fixed and the subsequent parts must be assembled, which also deteriorates the workability. There are also safety issues.

On the other hand, also in the conventional gas generator shown in FIG. 3, the lid member 48 having the ignition mechanism 46 built therein is provided.
When fixing the to the housing 42, the housing 4
A female screw portion is formed on the inner surface of the open side end portion of 2, while a male screw portion is formed on the outer peripheral surface of the lid member 48, and these two screw portions are screwed together, or without forming such a screw. After the two surfaces are brought into contact with each other, the fillet welding is performed from the upper side (the left side in the drawing) from the entire circumference. For this reason, the assembly work of the gas generator becomes complicated, and since precision is required for full-circumferential fillet welding, expensive precision welding equipment must be used. Has become a factor that raises.

The present invention has been completed as a result of intensive studies to solve such problems of the prior art. The invention according to claim 1 of the present invention has safety in consideration. It is an object of the present invention to provide a gas generator that enables easy assembly work with simple equipment and enables reduction in manufacturing cost. The invention according to claim 2 is
It is an object of the present invention to provide a gas generator capable of further facilitating the assembling work, among the effects of the invention according to claim 1. In addition to the object of the invention described in claim 1 or claim 2,
An object of the present invention is to provide a gas generator that can be more reliable in terms of ensuring safety during assembly work.
In addition to the object of the invention described in claims 1 to 3, it is an object of the invention described in claim 4 to provide a gas generator that can further contribute to simplification of the assembly work. In addition to the object of the invention described in claims 1 to 4, the invention described in claim 5 reduces the number of parts by eliminating the need for a dedicated auto-ignition agent, and is relatively complicated. An object of the present invention is to provide a gas generator capable of further improving the assembly work performance by omitting the step of incorporating an ignition agent. Further, according to the invention of claim 6, a gas generator for an air bag, which enables a gas generator having a simple structure and a small number of parts to be efficiently assembled with simple equipment, and can reduce the manufacturing cost. The purpose is to provide a method.

[0007]

Of the present invention that has achieved the above object, the invention according to claim 1 is in a tubular outer cylinder having a gas discharge orifice, which extends radially outward from the axial center side. A lid in which a gas generating agent, an inner cylinder having a gas passage hole, and a filter member are housed in this order, and an ignition means including an igniter and a transfer agent is provided at one end of the outer cylinder in the axial direction. A gas generator for an air bag in which members are attached by butt friction welding, wherein a brim portion is formed on a side surface of the gas generating agent of the lid member, the bridging cap member being capped from above the transfer agent. While extending along the inner cylinder and the end surface of the filter member on the ignition means side, a cap main body convex portion having a through hole for passing an ignition flame to transmit to the gas generating agent is formed on the inner surface of the inner cylinder. Characterized by being inserted along To. That is, the cap member having such a simple shape has a function of holding the transfer agent and a function of holding the transfer agent, the inner cylinder, and the filter member in the axial direction, thereby reducing the number of parts. You can
Moreover, since the cap member needs to be inserted along the inner surface of the inner cylinder only for a very short distance, the assembling work becomes very easy. Therefore, the manufacturing cost can be reduced in combination with the simple shape and the reduction in the number of parts. The "filter member" may be composed of a single wire mesh member, or may be a multi-layered wire mesh member having different mesh sizes, for example, a coarse wire mesh member may be sandwiched between intermediate layers, and both side layers may be formed. It is also possible to construct a wire mesh member having a three-layer structure in which fine wire mesh members are arranged. Further, not only the metal mesh member but also a metallic non-woven fabric or a ceramic fiber can be interposed. Both are useful in improving the gas cooling and slag collection effects.

In addition to the configuration of the invention described in claim 1, the invention according to claim 2 fixes the brim end of the cap member with a collar by abutting against a burr of an outer cylinder formed at the time of butt welding. It is characterized by being In this manner, the cap member is brought into contact with the burr of the outer cylinder and fixedly arranged in a state of being urged inward in the axial direction. Since the generator, the inner cylinder, and the filter member can be reliably and evenly pressed in the axial direction and the positioning can be facilitated, the assembling work can be further ensured.

In addition to the structure of the invention according to claim 1 or 2, the invention according to claim 3 includes both the cap member with a collar and the lid member, the lower end surface of the transfer agent and the lid member. It is characterized in that it is attached to one end in the axial direction of the outer cylinder while maintaining a positional relationship so that a gap can be secured with the upper end surface.
By ensuring the gap in this way, even if the lid member heats up during friction welding, the heat is not directly transferred to the transfer agent, so it is possible to guarantee the avoidance of accidental explosion of the transfer agent, and The safety can be surely ensured.

According to a fourth aspect of the present invention, in addition to the configurations of the first to third aspects of the present invention, a laminated structure of an inner cylinder and a filter member, in which a filter member is wound around the inner cylinder in advance, It is characterized in that it is fitted along the inner surface of the outer cylinder. This can further simplify the assembly work.

Further, in addition to the constitution of the inventions of claims 1 to 4, the invention of claim 5 is that the gas generating agent and the transfer agent are the same explosive composition, and the explosive composition is The substance is a compound containing a nitrogen atom-containing organic substance as a main fuel component. In this way, by making the transfer agent possess the function as an autoignition agent, it is possible to reduce the number of parts by eliminating the need for a dedicated autoignition agent, and also to make the dedicated autoignition agent relatively complicated. The assembly process can be further facilitated by omitting the assembling process. In addition, it is possible to greatly reduce the manufacturing cost of the gas generator and to provide an inexpensive gas generator together with the fact that the manufacturing facility for the dedicated auto-ignition agent, which has been separately required conventionally, can be omitted.

Further, in the method for manufacturing a gas generator according to the invention as defined in claim 6, a plurality of gas discharge orifices are axially formed in a cylindrical outer cylinder whose one end is closed, and the gas outer orifice is formed more than the outer cylinder. A tubular multi-layer body in which filter members are concentrically stacked in advance on the outside of a small-diameter tubular body is fitted and inserted along the inner surface from the open end side of the outer tube, and then the cap body of the cap member with a collar. While forming a through hole in the center of the upper surface of the convex portion, the inside of the convex portion is mounted with a thin-film container in which the transfer agent is sealed beforehand, and the convex portion is formed along the inner surface of the small-diameter cylinder. While being fitted, the collar portion extends along the outer cylinder opening side end surface of the small-diameter cylindrical body and the filter member,
Next, a convex lid member similar to the cap main body convex portion is fitted along the inner peripheral surface of the cap main body convex portion at the tip end side of the convex portion, and the annular rib formed on the outer peripheral end portion is formed. The tip end surface and the open end surface of the outer cylinder are butted and welded together, and then the igniter is fixed to a space formed in advance in the center of the shaft of the lid member so as to communicate with the outside. According to such a manufacturing method, it is possible to efficiently assemble a gas generator having a simple structure and a small number of parts with simple equipment, and to provide a cheaper gas generator for an airbag.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the configuration of a gas generator. In FIG. 1, first, the housing 1 of the gas generator has a lid member 9 that covers the other end (right end in the figure) of a tubular outer cylinder 6 whose one end (left end in the figure) is closed. The sealed space is formed by abutting the tips of the annular ribs 9a formed on the outer peripheral end of the ribs 9a and friction welding. And
The gas generator includes, in a cylindrical outer cylinder 6 having a gas discharge orifice 6a, a gas generating agent 2 in order from the axial center side toward the radially outer side, and an inner cylinder 3 having a gas passage hole 3a. A filter member 4 and a thin cylindrical burst plate 5 that functions to prevent moisture and adjust the internal pressure during combustion are housed.
On the other hand, when viewed in the axial direction, the lid member 9 having the ignition means including the igniter 8 and the transfer agent 10 at one end of the outer cylinder 6 in the axial direction.
Is attached by butt friction welding.

Further, the transfer agent 10 is arranged on the convex surface 9b of the lid member 9 on the side of the gas generating agent 2 with a small gap h, and is further provided with a flange from above (from the left in the figure). The cap member 7 is attached. Further, the flange portion 7a of the cap member 7 with a collar extends along the end surface of the cushion member 11 attached so as to cover the end surface of the filter member 4 from the outer peripheral end of the inner cylinder 3 on the lid member side. . As the cushion member 11, a molded product such as a silicon foam or a ceramic fiber is suitable. Reference numeral 12 denotes a cushion member attached to the closed inner wall of the outer cylinder 6 for the gas generating agent 2, the inner cylinder 3 and the filter portion 4. Also,
The front surface 7c of the cap body convex portion is formed with a through hole 7d for passing an ignition flame to transmit it to the gas generating agent 2. Further, the front end of the flange portion 7a of the cap member 7 is fixed by abutting against the flash 6b of the outer cylinder 6 formed during the butt welding. The positional relationship between the gas passage holes 3a and the gas discharge orifices 6a is arranged so as to be displaced from each other by 90 ° in the radial direction, that is, the gas discharge orifices 6a are arranged at symmetrical positions in the vertical direction. Are formed at symmetrical positions in the drawing penetrating direction.

The gas generating agent 2 and the transfer agent 10 may be the same explosive composition, and the explosive composition may be a compound containing a nitrogen atom-containing organic substance as a main fuel component. As such a compound, specifically, it is preferable to employ a mixture of the respective components selected from the following groups (a) to (c). (A) Nitrogen atom-containing organic substances that are the main fuel components that generate gas upon combustion decomposition are azodicarbonamide, carbohydrazide, dicyandiamide, aminotetrazole, aminoguanidine, triaminoguanidine nitrate, nitroguanidine, triazole, tetrazole, azo. Those selected from the group consisting of bitetrazole, bitetrazole, or salts thereof. (B) An oxidizer that burns the main fuel component. (C) A combustion control agent as a catalyst for controlling the oxidation reaction. By adopting the nitrogen-containing organic substance as described above, particularly in the production of an inexpensive gas generator, by using a nitrogen atom in the molecule having a high content and being substantially inexpensive and easily available in large quantities. This is because it can cope well with.

In using the above explosive composition, it is preferable to adjust the particle size in advance, for example, it is preferable to adjust the number-based 50% average particle size to be 5 to 80 μm. Specific examples of the oxidizing agent that can be used include nitrates, nitrites, oxohalogenates and the like. Of these, nitrates are preferable, and potassium nitrate is particularly preferable. The amount of the oxidizing agent added is preferably 50% by weight or more of nitrate in the explosive composition. This improves the combustion characteristics of the generated gas, is because particularly useful in the NO _X reduction effect. When using the oxidant, it is preferable to adjust the particle size to the same extent as that of the explosive composition in advance.

As the combustion control agent, a substance selected from the following groups can be used. By using these combustion modifiers, an explosive composition having self-ignitability can be obtained. One or more of zirconium, hafnium, molybdenum, tungsten, manganese, nickel, iron or their oxides or sulfides. One or more of carbon, sulfur or phosphorus. A mixture of the above and. Such a combustion modifier has a function of adjusting the rate of oxidation reaction (combustion) between the oxidant and the nitrogen atom-containing organic substance that is the main fuel component. The amount of the combustion modifier added may be 10% or less with respect to the weight of the explosive composition in order not to impair the amount of gas generated per unit explosive composition and to prevent excessive combustion residue. preferable. When using a combustion control agent, for example, the number-based 50% average particle size is 10μ.
It is preferable to adjust the particle size so that the particle size becomes m or less.

In the gas generator of the present invention constructed as described above, the cap member 7 having a simple shape holds the transfer agent 10, and the transfer agent 10, the inner cylinder 3 and the filter member 4 are axially arranged. It has a structure that has both a pressing function. For this reason, the number of parts can be reduced, and moreover, the cap member 7 needs to be inserted along the inner surface of the inner cylinder 3 for a very short distance, so that the assembling work becomes very easy. Therefore, since the cap member 7 has a simple shape, the manufacturing cost of the cap member 7 is low, and the number of parts can be reduced, so that the manufacturing cost can be reduced.

Further, the brim portion 7 of the cap member 7 with the brim
As a result of the tip of a being in contact with and fixed to the flash 6b of the outer cylinder 6 formed during butt welding, the cap member 7
Is in a fixed arrangement while being urged inward in the axial direction. Therefore, the cap member 7 can reliably and evenly press the gas generating agent 2, the inner cylinder 3 and the filter member 4 in the axial direction while absorbing the error amount of the pressure contact amount at the time of friction welding, that is, simple equipment. Since these components can be easily positioned appropriately, the assembling work can be further facilitated.

Also, the cap member 7 with a collar and the lid member 9
Both of them are attached to one end in the axial direction of the outer cylinder while maintaining an arrangement relationship such that a lower end surface of the transfer agent 10 can secure a gap between the lower end surface and the upper end surface of the lid member 9. Therefore, by ensuring the clearance in this way, even if the lid member 9 is heated during friction welding, the heat can be prevented from being directly transmitted to the transfer agent 10. It is possible to guarantee the avoidance of explosion and ensure the safety during assembly work.

As a construction in which the inner cylinder 3 and the filter member 4 are laminated inside the outer cylinder 6, a filter member 4 wound in advance on the inner cylinder 3 is fitted along the inner surface of the outer cylinder 6. This makes it possible to further simplify the assembling work, which is a more preferable aspect.

The gas generating agent 2 and the transfer agent 10 are the same explosive composition as described above, and the explosive composition is a compound containing the above nitrogen atom-containing organic matter as the main fuel component. Is preferably used. In such a gas generator, the transfer agent 10 has a function as an auto-ignition agent, so that a dedicated auto-ignition agent is not required, so that the number of parts can be reduced, and the relatively complicated dedicated The assembly process can be further facilitated by omitting the step of incorporating the auto-ignition agent. In addition, it is possible to greatly reduce the manufacturing cost of the gas generator and to provide an inexpensive gas generator together with the fact that the manufacturing facility for the dedicated auto-ignition agent, which has been separately required conventionally, can be omitted.

Next, an embodiment of a method for manufacturing a gas generator according to the present invention will be described with reference to FIG. First, the gas discharge orifice 6 is attached to the cylindrical outer cylinder 6 whose one end is closed.
After forming a plurality of a in the axial direction, the cushion member 12 is laid over the entire inner wall of the outer cylinder 6 on the closed side. As the cushion member 12, a molded product such as a silicon foam or a ceramic fiber is suitable. Next, the filter member 4 is preliminarily concentrically laminated on the outside of the cylindrical body 3 having a smaller diameter than the outer cylinder 6, and the cushion member is formed so as to cover the end face of the filter member 4 from the outer peripheral end of the cylindrical body 3. The tubular multi-layer body 11 to which is attached is fitted from the open end side (the right side in the figure) of the outer tube 6 along the inner surface thereof. Next, a through hole 7d is formed in the center of the upper surface of the cap main body convex portion of the collared cap member 7, while a thin film container 16 in which the transfer agent 10 is sealed is attached inside the convex portion. The convex portion is fitted along the inner surface of the small diameter cylindrical body 3. At this time, the collar portion 7a extends along the end face of the filter pressing plate 11, and the tip end side of the collar portion 7a is bent so as to slightly extend toward the open side, and the tip end face thereof is an outer cylinder. Set it so that it is at a position slightly lower than the open end face of 6 (a position slightly lower to the left in the figure). Then, the lid member 9 having a convex shape similar to the cap main body convex portion is pushed forward with its tip end side along the inner peripheral surface of the cap main body convex portion. Then, when the tip end surface of the annular rib 9a formed on the outer peripheral end of the lid member 9 comes into contact with the open end surface of the outer cylinder 6, the lid member 9 is gripped with respect to the fixed outer cylinder 6. Push in while rotating with a predetermined pressure. As a result, the contact surface is melted by frictional heat, and the butt welding of the outer cylinder 6 and the lid member 9 is completed.

At the end, the collar portion 7 of the cap member 7
The tip side of a is in close contact with the flash 6b of the outer cylinder 6 in the circumferential direction and is pressed by the flash 6b. Next, the igniter 8 is fixed to the space 17 which is formed in the center of the shaft of the lid member 9 so as to communicate with the outside in advance, whereby the assembly work of the gas generator is completed. Therefore, according to such a manufacturing method, it is possible to efficiently assemble a gas generator having a simple structure and a small number of parts with simple equipment, and to provide a cheaper gas generator for an airbag. Become.

[0025]

The invention according to claim 1 of the present invention is
In the cylindrical outer cylinder having the gas discharge orifice, the gas generating agent is sequentially arranged from the axial center side toward the radially outer side, the inner cylinder having the gas passage holes, and the filter member are housed,
A gas generator for an air bag in which a lid member provided with an ignition means composed of an igniter and a transfer agent is attached by butt friction welding to one end of the outer cylinder in the axial direction, and the gas generating agent of the lid member. Of the cap member with a collar that is capped on the side surface from above the flange, the flange portion is extended along the end faces of the inner cylinder and the filter member on the side of the ignition means, while the ignition flame is generated. A cap main body convex portion having a through hole for passing through so as to be transmitted to the inner cylinder is fitted along the inner surface of the inner cylinder.

As a result, the cap member having a simple shape can have both the function of holding the transfer agent and the function of pressing the transfer agent, the inner cylinder and the filter member in the axial direction, thus reducing the number of parts. It has become possible. Moreover, since the cap member needs to be inserted along the inner surface of the inner cylinder only for a very short distance, the assembling work becomes very easy. Therefore, the manufacturing cost can be reduced in combination with the simple shape and the reduction in the number of parts.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the front end of the flange portion of the cap member with a collar is fixed by abutting against the burr of the outer cylinder formed during the butt welding. is there. Therefore, the cap member is brought into contact with the flash of the outer cylinder and fixedly arranged in a state of being urged inward in the axial direction, so that the cap member generates gas while absorbing the error amount of the pressure contact amount at the time of friction welding. Since the agent, the inner cylinder, and the filter member can be reliably and evenly pressed in the axial direction and the positioning can be facilitated, the assembling work can be further facilitated.

The invention according to claim 3 is the same as the invention according to claim 1 or 2, wherein both the cap member with a collar and the lid member are provided with a lower end surface of the transfer agent and an upper end surface of the lid member. It is attached to one end of the outer cylinder in the axial direction while maintaining a positional relationship so that a gap can be secured between them. Therefore,
By ensuring the gap in this way, even if the lid member heats up during friction welding, the heat is not directly transferred to the transfer agent, so it is possible to guarantee the avoidance of accidental explosion of the transfer agent, and The safety can be surely ensured.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the inner cylinder and the filter member have a laminated structure in which the filter member is wound around the inner cylinder in advance. , Is fitted along the inner surface of the outer cylinder. Therefore, it is possible to provide a gas generator that can further simplify the assembly work and contribute to the reduction of the manufacturing cost.

The invention according to claim 5 is the same as the invention according to any one of claims 1 to 4, wherein the gas generating agent and the transfer agent are the same explosive composition and the same explosive. The composition is a compound containing a nitrogen atom-containing organic substance as a main fuel component. By allowing the transfer charge to function as an auto-ignition agent, it is possible to reduce the number of parts without the need for a dedicated auto-ignition agent, and to save the relatively complicated assembly process of the dedicated auto-ignition agent. Therefore, the assembling work can be further facilitated. In addition, it is possible to greatly reduce the manufacturing cost of the gas generator and to provide an inexpensive gas generator together with the fact that the manufacturing facility for the dedicated auto-ignition agent, which has been separately required conventionally, can be omitted.

According to a sixth aspect of the present invention, there is provided a gas generator manufacturing method, wherein a plurality of gas discharge orifices are formed in an axial direction in a tubular outer cylinder having one end closed, and then a diameter smaller than the outer cylinder. A cylindrical multi-layered body in which filter members are preliminarily concentrically laminated on the outside of the cylindrical body is inserted along the inner surface from the open end side of the outer cylinder, and then the cap body convex portion of the cap member with a collar is inserted. While a through hole is formed in the center of the upper surface of the above, inside of the convex portion, a thin-film container in which a transfer agent is sealed is attached in advance, and the convex portion is fitted along the inner surface of the small diameter cylindrical body. At the same time, the collar portion extends along the outer cylinder open side end surface of the small-diameter tubular body and the filter member, and then a convex lid member similar to the cap main body convex portion is formed on the convex portion. While inserting the tip side along the inner peripheral surface of the convex part of the cap body, The end face of the annular rib formed at the outer peripheral end and the open end face of the outer cylinder are butt-welded together, and then the igniter is provided in the space formed in advance in the center of the shaft of the lid member so as to communicate with the outside. Is fixed. Therefore, according to such a manufacturing method, it is possible to efficiently assemble a gas generator having a simple structure and a small number of parts with simple equipment, and to provide a cheaper gas generator for an airbag.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional explanatory view showing an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional explanatory view showing a conventional gas generator.

FIG. 3 is a schematic cross-sectional explanatory view showing another conventional gas generator.

[Explanation of symbols]

 1 Housing 2 Gas Generating Agent 3 Inner Cylinder 4 Filter Member 5 Burst Plate 6 Outer Cylinder 7 Cap Member 8 Igniter 9 Lid Member 10 Transfer Agent 11, 12 Cushion Member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seigo Taguchi 3903-39, Abundant Town, Himeji City, Hyogo Prefecture Nihon Kayaku Co., Ltd. Himeji Factory Sensor / Technology Co., Ltd. Himeji Technical Center

Claims (6)

[Claims] 1. A gas generating agent (2) and a gas passage hole (3a) are sequentially arranged in a cylindrical outer cylinder (6) having a gas discharge orifice (6a) from a shaft center side toward a radially outer side. ), The inner cylinder (3) and the filter member (4) are housed, and an ignition means composed of an igniter (8) and a transfer agent (10) is provided at one end of the outer cylinder (6) in the axial direction. A gas generator for an air bag in which a lid member (9) provided is attached by butt friction welding, and the transfer agent (10) is provided on a surface of the lid member (9) on the gas generating agent (2) side. Of the cap member (7) with a collar that is crowned from above, the collar portion (7
While extending a) along the end faces of the inner cylinder (3) and the filter member (4) on the ignition means side, through holes (7) for passing the ignition flame to the gas generating agent (2) are transmitted.
A gas generator for an air bag, characterized in that a cap body convex portion having d) is fitted and inserted along the inner surface of the inner cylinder (3). 2. The brim (7a) tip of the brim cap member (7) is fixed by abutting against the flash (6b) of the outer cylinder (6) formed during the butt welding. Item 1. An air bag gas generator according to item 1. 3. A gap (h) between the lower end surface of the transfer material (10) and the upper end surface of the lid member (9) in both the cap member (7) with a collar and the lid member (9). The gas generator for an air bag according to claim 1 or 2, wherein the gas generator is attached to one end of the outer cylinder (6) in the axial direction while maintaining a positional relationship so as to secure (1). 4. The inner cylinder (3) and the filter member (4)
4. The air according to claim 1 to claim 3, wherein the laminated structure is a structure in which a filter member (4) is wound around an inner cylinder (3) in advance and is fitted along an inner surface of the outer cylinder (6). Gas generator for bags. 5. The gas generating agent (2) and the transfer agent (1)
0) is the same explosive composition, and the explosive composition contains an organic compound having a nitrogen atom as a constituent element (hereinafter abbreviated as "nitrogen atom-containing organic compound") as a main fuel component. The gas generator for an air bag according to claim 1. 6. A plurality of gas discharge orifices (6a) are formed in an axial direction in a cylindrical outer cylinder (6) having one end closed, and then a cylindrical body (3) having a smaller diameter than the outer cylinder (6). ), A tubular multi-layered body in which filter members (4) are concentrically stacked in advance is inserted from the open end side of the outer cylinder (6) along its inner surface, and then the cap member with a collar ( A through hole (7d) is formed in the center of the upper surface of the convex portion of the cap body of 7), while a thin-film container (16) preliminarily filled with a transfer agent (10) is mounted inside the convex portion. The convex portion is fitted along the inner surface of the small-diameter tubular body (3), and the flange portion (7a) is provided on the outer cylinder open side end surface of the small-diameter tubular body (3) and the filter member (4). A lid member (9) having a convex shape that is similar to the convex portion of the cap body and is made to extend along it.
While the front end side of the convex portion is fitted along the inner peripheral surface of the cap main body convex portion, the front end surface of the annular rib (9a) formed on the outer peripheral end portion and the open side of the outer cylinder (6). Gas generation for an air bag characterized by butt-welding with an end face, and then fixing an igniter (8) to a space formed in advance in the axial center of the lid member (9) so as to communicate with the outside. Manufacturing method.