JP7286458B2 - igniter - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is an igniter that is useful as an electric igniter (so-called squib) incorporated in a gas generator that drives an occupant protection device for a vehicle, a pedestrian protection device, or the like. The present invention relates to an igniter suitable for use in pyrotechnics that operate seat belt pretensioner devices and those that are subject to high pressure.

2. Description of the Related Art Conventionally, a gas generator that rapidly inflates and deploys an airbag has been used in order to protect passengers from the impact that occurs when a vehicle collides. The gas generator may be a gas generator used in a driver's seat airbag device installed in a steering wheel or a passenger's seat airbag device installed in a dashboard, or a micro gas generator used in a seatbelt pretensioner or the like. A gas generator (MGG) etc. are mentioned. Squibs used for vehicles are required to have a particularly high degree of safety because they are used in the vicinity of passengers. In addition, it is normally kept in a standby state for a long time, and it is necessary to operate reliably in an emergency. Therefore, special consideration is given to its constituent materials, manufacturing process and airtightness.

The igniter is incorporated in an occupant protection device such as an airbag device or a seatbelt pretensioner, and is ignited by energization from a control unit when a vehicle or the like collides. It is a device that instantly generates a large amount of gas by burning a gas generating agent with a flame generated by an igniter, thereby inflating and deploying an airbag.

2. Description of the Related Art In recent years, attempts have been made to fix a terminal pin to a metal holding member in an igniter by insert molding using a resin material as a raw material from the viewpoint of weight reduction and simplification of manufacture. Specifically, for example, a bottomed cylindrical holding member having an opening formed in the bottom plate is manufactured by pressing a single metal plate-like member, and the opening is inserted. Insulating fluid resin material is poured into the space between the terminal pins and the holding member and solidified to form a resin molded body, and the terminal pins are inserted through the formed resin molded body. is fixed to a holding member.

As a document disclosing the structure, there is, for example, Japanese Patent Laying-Open No. 2018-59691 (Patent Document 1). Patent Document 1 discloses an igniter in which a resistor can be easily provided without polishing the contact surface of the plug on the gunpowder side. The igniter is connected to a tubular body having two terminal pins fixed by a resin molded body of a thermosetting resin composition, which is fitted by plugging, a cup-shaped squib case covering the tubular body, and two terminal pins. and a resin molded body for integrally fixing a tubular body, a squib case, two terminal pins, and the like. The plug is provided with two holes into which two terminal pins can be inserted, at positions eccentric from the central axis. The igniter has a holding member made of metal, and the holding member holds a pair of terminal pins.

JP 2018-59691 A

However, in the conventional technology described above, there are many steps and members for fixing the terminal pins, so there is room for simplification of the steps and accompanying cost reduction. In particular, since metal holding members are small in size, they are processed by cutting. In addition, in igniters used in devices that require a long service life such as airbag devices, it is necessary to ensure sealing performance so that the chemical does not absorb moisture. is required.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an igniter capable of improving the sealing strength as compared with the conventional one.

(1) An igniter used by being attached to a gas generator, the igniter provided with an ignition charge for burning the gas generating agent, and the igniter defining an ignition chamber containing the ignition charge. and a terminal pin connected to the ignition part for igniting the ignition charge and inserted through an opening defined by a metal holding member formed in a cylindrical shape with a bottom. The ignition part has a substantially cylindrical cup body with a closed upper end and an open lower end, and a plug that closes the lower end of the cup body and supports the terminal pins, the pair of terminal pins and the pair of terminals It has a first hole through which one of the pins is inserted and a second hole through which the other terminal pin is inserted. In a state in which the pin is inserted through the second hole, it abuts against the outer surface of a holding member made of metal formed in a cylindrical shape with a bottom larger than the shaft diameter of the other terminal pin. a fluid resin material filled to insulate one of the terminal pins from the holding member and the other terminal pin; The resin molded body includes an annular coating portion that is fixed to the inner peripheral surface of the holding member and covers the inner surface, and the resin molded body is a recess provided on the inner surface of the holding member or This igniter is characterized in that it is fixed by a convex portion.

According to the configuration (1) above, unlike the conventional configuration in which the interface between the inner surface of the holding member and the resin molding is held by the fixing force of the resin molding, the unevenness of the concave portion or the convex portion on the inner surface of the holding member is eliminated. By providing the shape, the contact area of the interface between the resin molded body and the holding member is increased, and the sealing strength is improved.

(2) It is preferable that the end of the peripheral wall of the second hole on the outer surface side of the holding member is tapered.

According to the configuration (2) above, since a part of the other terminal pin is engaged with the taper, it is difficult for the other terminal pin to come off from the first hole, which is preferable in that it leads to an improvement in sealing strength. .

(3) The inner diameter of the metal holding member is 10 mm or less.

According to the above configuration (3), by providing a concave portion or a convex portion in the inner diameter of the holding member of 10 mm or less, the fluid resin material enters the fine space, which leads to an improvement in the sealing strength. is preferred.

(4) The bottom plate of the holding member has a concave portion or a convex portion.

According to the above configuration (4), since the inner bottom surface, which is one of the inner surfaces of the holding member, is provided with the concave portion or the convex portion, the manufacturing is easy and the sealing strength can be ensured, which is preferable.

(5) It is preferable that the recesses or projections on the inner surface of the holding member made of metal be formed by pressing, blasting, or barreling.

According to the above configuration (5), the holding member made of metal is formed by pressing instead of cutting. Therefore, grain flow lines inside the metal are not sheared, and the holding member integrally holds the strength of the metal. Further, molding by press working is preferable in that the manufacturing cost can be reduced as compared with cutting. It is also possible to provide an uneven shape on the holding member during pressing, and furthermore, in order to provide a dense uneven shape, blasting or barrel processing can be used to improve the sealing strength between the resin molded body and the holding member. preferable.

ADVANTAGE OF THE INVENTION According to this invention, the igniter which can improve sealing strength conventionally can be provided.

It is a mimetic diagram showing an internal structure of an igniter concerning Embodiment 1 of the present invention. FIG. 4 is a schematic diagram showing an embolization structure according to Embodiment 2 of the present invention; FIG. 4 is a schematic diagram showing the manufacturing process of the squib of the present invention. It is a schematic diagram which shows the modification which concerns on the holding member of this invention. It is a schematic diagram which shows the modification which concerns on the holding member of this invention. It is a schematic diagram which shows the modification which concerns on the holding member of this invention. 1 is a schematic diagram showing a gas generator provided with a squib of the present invention; FIG. 1 is a schematic diagram showing a micro gas generator equipped with a squib of the present invention; FIG.

The internal structure of the igniter according to Embodiment 1 of the present invention will be described with reference to FIG.

(Configuration of igniter 100)
The igniter 100 includes a plug 7 having two terminal pins 4 and 5 fixed to a holding member 2 by a resin molded body 9 of a thermosetting resin composition, a tubular body 3 fitted by the plug 7, A cup-shaped squib case 13 covering the tubular body 3, a resistor 12 connected to the terminal pins 4 and 5, and resin 6 integrally fixing the tubular body 3, the squib case 13, the terminal pins 4 and 5, etc. (body member).

The holding member 2 is made of a metal material such as stainless steel, aluminum, copper, iron, or the like. Similarly, the terminal pins 4 and 5 extending from the holding member 2 are also made of a metal material such as stainless steel, aluminum, copper, iron, or the like. The embolism 7 is provided with a first hole 8 and a second hole 10 that allow insertion of the terminal pins 4 and 5 at positions eccentric from the central axis. As shown in FIG. 1, one end of the resistor 12 bridged from the terminal pin 4 is installed on the ignition charge 1 side of the holding member 2 along with the contact surface 7a of the holding member 2 and the inner surface of the second hole 10. A flat portion is provided. One of the openings 11 is connected to both the first hole 8 and the second hole 10 and is defined by the inner peripheral surface 15a and the inner bottom surface 15b of the holding member 2 . The terminal pin 4 is insulated from the terminal pin 5 and the holding member 2 by forming the insulating resin molding 9 in the opening 11 .

The terminal pin 4 has a tip end inserted into the first hole 8 of the holding member 2 . The tip of terminal pin 4 is electrically connected to terminal pin 5 by resistor 12 . Note that the tip of the terminal pin 4 is flat and arranged so as to be positioned substantially on the same plane. One side of the tip portion of the terminal pin 4 is plated on the surface thereof to ensure good electrical contact.

The terminal pin 5 has a tip portion disposed in the second hole portion 10 of the holding member 2 and has a flat surface positioned substantially on the same plane as the contact surface 7 a of the holding member 2 . One side of the tip of the terminal pin 5 is plated on the surface to ensure good electrical contact.

The resistor 12 is joined to the tip of the terminal pin 4, the contact surface 7a of the holding member 2, and the tip of the terminal pin 5 so as to bridge between the tip of the terminal pin 4 and the tip of the terminal pin 5. is provided. Here, the resistor 12 may be a bridge wire made of a conductive wire material such as a nickel-chromium alloy. The tip of the terminal pin 4, the tip of the terminal pin 5, and the resistor 12 may be joined by any method such as soldering, welding, or fusing, but welding is preferred. Especially good for resistance welding.

Like the holding member 2, the tubular body 3 fitted to the embolus 7 is made of a metal material such as stainless steel, aluminum, copper, or iron. Therefore, the plug 7 and the tubular body 3 can be welded. This makes it possible to prevent moisture absorption into the tubular body 3, and prevents the embolus 7 from jumping out of the tubular body 3 even when the igniter is activated. As a welding method, various ordinary welding methods such as laser welding and electron beam welding can be employed.

A cup-shaped squib case 13 is provided so as to cover the tubular body 3 . The squib case 13 is integrally fixed to the resin 6 together with the tubular body 3 when the resin 6 is molded. The squib case 13 is made of resin such as PBT (polybutylene terephthalate), PET (polyethylene terephthalate), PA6 (nylon 6), PA66 (nylon 66), PPS (polyphenylene sulfide), PPO (polyphenylene oxide), and fluorine resin. It is The squib case 13 does not need to be made of a single member, and may be made up of a combination of several members. . Also, a score may be provided on the portion forming the upper wall of the tubular body 3 .

The resin 6 is made of thermoplastic resin. Examples of thermoplastic resins include synthetic resins such as PBT (polybutylene terephthalate), PET (polyethylene terephthalate), PA6 (nylon 6), PA66 (nylon 66), PPS (polyphenylene sulfide), PPO (polyphenylene oxide), and glass. A mixture of fibers and the like is preferable. Further, the resin 6 may be composed of a thermosetting resin of a normal temperature setting type or a thermosetting type, and may further contain a curing agent, a curing accelerator, and the like, if necessary. Examples of thermosetting resins include epoxy resins, phenolic resins, unsaturated polyesters, polyurethanes, polyimides, silicon resins, and the like.

The resin molding 9 is a thermosetting fluid resin material, and examples thereof include thermosetting resin compositions such as epoxy resin, phenolic resin, unsaturated polyester, polyurethane, polyimide, and silicon resin. Epoxy resin is particularly preferable as the thermosetting fluid resin material from the viewpoint of heat resistance, moisture resistance, electrical properties, adhesiveness, workability, and the like. This is because the epoxy resin has a low shrinkage rate, so that a gap is less likely to occur at the interface between the holding member 2 and the resin molding 9 which is a solidified fluid resin material. Similarly, in order to make the gap less likely to occur, the shrinkage rate of the thermosetting fluid resin material is preferably 1.5% or less, more preferably 1.0% or less.

The ignition charge 1 is filled so as to cover the periphery of the resistor 12 , the tips of the terminal pins 4 and 5 , and the contact surface 7 a of the holding member 2 . The ignition charge 1 is provided in a spatial region within the tubular body 3 of the igniter 100 excluding the arrangement region of the holding member 2 . The terminal pins 4,5 are connected to each other via a resistor 12 for igniting the igniter charge 1. FIG. The resistor 12 is attached so as to connect the tips of the terminal pins 4 and 5, and the ignition charge 1 is loaded in the tubular body 3 so as to surround the resistor 12 or be close to the resistor 12. there is A nichrome wire or the like is generally used as the resistor 12, and ZPP (zirconium/potassium perchlorate), ZWPP (zirconium/tungsten/potassium perchlorate), lead tricinate, or the like is generally used as the ignition charge 1.

Any material can be used as the ignition charge 1 as long as it functions as an ignition charge for the resistor 12. Slurry potassium perchlorate (KClO ₄ ), basic copper nitrate, zirconium (Zr), aluminum (Al) as a component, and as binders, vinyl chloride/isobutyl vinyl ether copolymer Laloflex, fluororubber Viton, nitrocellulose, etc., and mixtures thereof can also be used, titanium hydride (TiH), perchlorine It is also possible to use those containing potassium acid (KClO ₄ ) as a component and using Laroflex, a vinyl chloride/isobutyl vinyl ether copolymer, Viton, fluororubber, nitrocellulose, etc., as a binder, and mixtures thereof.

A predetermined amount of current flows through the resistor 12 through the terminal pins 4 and 5 when a collision is detected. When a current flows through the resistor 12, Joule heat is generated in the resistor 12, and the ignition charge 1 starts burning. A high-temperature flame generated by the combustion ruptures the squib case 13 containing the ignition charge 1 . The time from when the current flows through the resistor 12 to when the igniter 100 is activated is generally 2 milliseconds or less when a nichrome wire is used for the resistor 12 .

The holding member 2 is formed into a cylindrical shape with a bottom by deep drawing by cutting or press working, and is placed inside the squib case 13 so that the end face of the opening 11 and the end face of the squib case 13 on the opening side are substantially flush with each other. is distributed to

Although the holding member 2 may be formed by cutting, it is preferably formed by pressing. The concave-convex shape 14 is formed by pressing a metal plate member and simultaneously pressing the inner bottom surface 15 b of the holding member 2 . Furthermore, the press work does not shear grain flows inside the metal, and the holding member retains the strength of the metal as an integral unit. By forming the concave-convex shape by press working in this way, it becomes possible to manufacture the squib more simply. In the present invention, the uneven shape 14 is defined as having at least one of concave portions and convex portions. The depressions formed by pressing on the inner bottom surface 15b of the holding member 2 may be provided in an annular shape, may be circular depressions as spots, or may be discontinuous depressions formed in an annular shape. Here, it is preferable to provide an annular concave portion because the sealing strength can be improved.

The uneven shape 14 is formed on the inner bottom surface 15b of the holding member 2 by cutting or pressing. Due to the uneven shape 14, the fluid resin material enters the grooves of the unevenness, and the interface between the resin molding 9 and the holding member 2 is brought into close contact, thereby improving the sealing strength. Furthermore, it is preferable that the inner diameter of the holding member 2 is 10 mm or less, and the irregular shape 14 is precisely formed. Since the present invention relates to a squib, the holding member 2 has an inner diameter of about 10 mm or less. Therefore, the recesses or protrusions to be provided are also finely provided. Therefore, the fluid resin material enters into minute gaps, effectively suppressing the formation of gaps at the interface, thereby improving the sealing strength. Here, from the viewpoint of further improving the sealing strength, the height of the protrusions or recesses is preferably 0.5 mm or less, more preferably 0.1 to 0.4 mm. Further, the groove width is preferably 1.0 mm or less, more preferably 0.4 to 0.6 mm. The width of the groove changes depending on the shape and position of the hole of the holding member 2 .

A concave portion or a convex portion can be provided on the inner surface 15 of the holding member 2 by cutting or pressing. The place where the concave portion or convex portion is formed by cutting or pressing may be the inner peripheral surface 15a or the inner bottom surface 15b of the holding member. A single concave portion or convex portion may be provided, or a plurality of concave portions may be provided.

When forming the recess, it is preferable to provide the recess along the inner peripheral surface so as to be continuous with the inner peripheral surface 15a of the holding member. That is, it is preferable that the groove portion is connected to the inner peripheral surface of the holding member 2 . By forming in this way, the contact area between the resin molded body 9 of the solidified fluid resin material and the inner surface 15 of the holding member 2 is increased, so that the resin molded body 9 can be more effectively removed from the holding member 2. can be effectively prevented. Further, by forming the recessed portion at the relevant portion, it is possible to prevent the presence of the R portion of the connecting portion between the inner peripheral surface 15a and the inner bottom surface 15b of the holding member 2, and to form a more acute angle. Therefore, since the fluid resin material penetrates into every corner of the connecting portion at a sharper angle, it is possible to further improve the sealing strength. Therefore, even when forming the recesses by cutting, it is preferable to perform processing so that the grooves are formed so as to be continuous with the inner surface 15 .

FIG. 2 is a schematic diagram showing the structure of a holding member according to Embodiment 2 of the present invention.

2 is different in that the inner peripheral surface 15a of the holding member 2 and the inner surface 15 of the inner bottom surface 15b are formed with an uneven shape 14. In FIG.

Blasting, barrel processing, or laser processing can be used to form a dense uneven shape on the uneven shape 14 of FIG. . Blast processing, barrel processing and laser processing are commonly used industrial methods. Blast processing, barrel processing, or laser processing may be performed on either the inner peripheral surface 15a or the inner bottom surface 15b, or may be performed on both surfaces.

(Manufacturing process of igniter 100)
Next, a manufacturing process of the igniter 100 according to the first embodiment of the present invention will be described with reference to FIG.

First, an embolism 7 is formed. The holding member 2 is processed so as to form a substantially central portion of a plate-like member made of a metal material such as stainless steel, aluminum, copper, or iron. A through-hole of the 2-hole portion 10 is formed. An opening 11 is formed on the side opposite to the contact surface 7 a of the holding member 2 , and an uneven shape 14 is formed on the inner surface 15 of the holding member 2 . As an example of a specific method of forming the uneven shape 14 , the uneven shape 14 can be formed by forming an annular concave portion by annularly pressing a part of the inner surface 15 of the holding member 2 .

Next, the first hole 8 can be closed from the contact surface 7a side of the holding member 2, and when the first hole 8 is closed, the jig 20, which is substantially flush with the bottom surface of the opening 11, is placed on the contact surface 7a of the embolism 7. attach to the side. Then, the tips of the terminal pins 4 are inserted into the jig recesses 20a of the jig 20 and temporarily fixed so as not to fall. Subsequently, the terminal pin 5 is press-fitted into the second hole 10 of the embolism 7 from the opening 11 side (see FIG. 3A).

Next, a thermosetting fluid resin material is injected into the opening 11 of the holding member 2 to form the resin molding 9 (see FIG. 3B). After curing to form a resin molding 9 of the thermosetting resin composition, the jig 20 is removed, and the plug 7 is rotated 180° from the state shown in FIG. Insert the terminal pins 4 and 5 into and fix it so that it does not fall down. Subsequently, the resistor 12 is joined to the tip of the terminal pin 4 and the tip of the terminal pin 5 (see FIG. 3(C)). Subsequently, the jig 20 is removed, the plug 7 is inserted into the tubular body 3 filled with the ignition charge 1, and the plug 7 and the tubular body 3 are joined by welding. At this time, the periphery of the resistor 12 is covered with the ignition charge 1 . Furthermore, the igniter 100 is completed by covering the tubular body 3 with the cup-shaped squib case 13 so as to cover the tubular body 3 fitted in the squib case 13 (see FIG. 3D). The jig 20 may be removed after the tubular body 3 filled with the ignition charge 1 and the squib case 13 are inserted.

4 to 6 are schematic cross-sectional views of holding members 2 according to second to fourth modifications. Hereinafter, some of possible modifications of the holding member 2 according to the present embodiment will be described with reference to FIGS. 4 to 6. FIG.

A holding member 2 according to a second modification shown in FIG. 4 is configured such that a concave portion is provided on an inner peripheral surface 15a of the holding member 2 by cutting.

A holding member 2 according to a third modified example shown in FIG. By configuring in this way, it is possible to further improve the sealing strength between the fluid resin material of the resin molding 9 and the holding member 2 . Referring to FIG. 5, the adhesive tape 16 has a base material 16a made of a sheet-shaped molding and an adhesive layer 16b provided on one main surface of the base material 16a. The adhesive surface of 16b is adhered to the inner peripheral surface 15a of the holding member 2. As shown in FIG.

The base material 16a of the adhesive tape 16 is composed of a fibrous or porous sheet-like molding. Specifically, as the base material 16a, any one or a combination of chemical fibers, natural fibers, paper, resin foams and rubber foams can be preferably used, and more preferably acetate fibers, Aggregates of cellulosic fibers typified by crepe paper and non-woven fabrics, aggregates of non-cellulose fibers typified by glass fibers and polyethylene fibers, foamed resins typified by foamed polyethylene, foamed polypropylene, foamed silicone, etc. rubber foams such as rubber foams, EPDM foams, chloroprene foams, and the like can be used. The resin foam and rubber foam may be either closed-cell type or open-cell type.

On the other hand, as the adhesive layer 16b of the adhesive tape 16, any material can be used as long as it is made of a material having adhesiveness and elasticity. A material made of an acrylic material or the like can be suitably used.

Here, when a fibrous or porous sheet-like molded body is used as the base material 16a of the adhesive tape 16, the surface of the base material 16a has an infinite number of fine irregularities 17, and furthermore, the adhesive When a fibrous or open-celled porous sheet-like molded body is used as the base material 16a of the tape 16, not only are countless minute unevennesses 17 present on the surface of the base material 16a, but also the unevennesses 17 There are countless minute labyrinth-like passages that continue to the inside of the base material 16a. The fluid resin material enters up to the point where the fluid resin material is hardened as it is. As a result, the adhesion at the interface between the base material 16a and the fluid resin material is dramatically improved, and along with this, the adhesion force between the base material 16a and the fluid resin material is greatly increased. Adhesion is improved.

In addition to the case of using the adhesive tape 16 as described above, the adhesive of the adhesive layer 16b may be directly applied and cured to form an adhesive layer, and then the fluid resin material may be poured and solidified. , it is possible to improve the sealing strength.

A holding member 2 according to a fourth modified example shown in FIG. 6 is configured such that uneven shapes 14 of concave portions or convex portions are provided on an inner bottom surface 15b of the holding member 2 in the form of spots. A similar spot shape may be provided on the inner side surface 15 a of the holding member 2 . Further, the uneven shape 14 of the concave or convex portion may be provided annularly on the inner side surface 15a or the inner bottom surface 15b by embossing.

Even with the holding members according to the second to fourth modifications, the same effects as with the above-described holding member 2 according to the present embodiment can be obtained.

(Main features of igniter 100)
According to the present embodiment, by providing the concave-convex shape 14 on the inner surface 15 of the holding member 2, the sealing strength is ensured more than the conventional one, and the inexpensive resin molded body 9 with relatively low sealing strength can be used, thereby preventing embolization. It is possible to provide the igniter 100 in which the resistor 12 can be easily provided in the first hole 8 and the second hole 10 of 7. Furthermore, the manufacturing process can be simplified, and the cost can be made cheaper than before. Furthermore, the physical increase in seal strength allows the use of resins with relatively low seal strength. A resin having a relatively low sealing strength is inexpensive and has the effect of reducing costs.

Also, the resistor 12 can be easily attached to the tip of the terminal pin 4 of the embolism 7 . In addition, since the first hole 8 of the plug 7 is covered with the ignition charge 1 while the resistor 12 is attached more securely, the electrical sensitivity can be further stabilized.

Although the embodiments of the present invention have been described above based on the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

For example, in the above-described embodiment, the terminal pin 5 is electrically connected to the embolism 7 by inserting it into the first hole 10, but any configuration that electrically contacts the embolism 7 may be used. Alternatively, the second hole 10 may not be formed, and the contact may be made to some part of the inner surface of the opening 11 .

Next, an airbag gas generator using the squib of the present invention will be described.

FIG. 7 shows a conceptual diagram of the airbag gas generator. As shown in the figure, the air bag gas generator 21 has a squib 22, an enhancer agent 23, a gas generating agent 24, and a filter 25 inside, and a housing capable of withstanding the combustion pressure of the gas generating agent 24 on the outside. 26. The housing 26 is provided with a gas ejection port 27 for releasing the generated gas toward the airbag.

When the squib 22 is actuated, the heat energy generated by the squib 22 burns the enhancer 23 to generate flame and hot particles. The flame and hot particles burn the gas generating agent 24 to generate gas for inflating the airbag. This gas is discharged to the outside from a gas ejection port 27 opened in the housing 26 of the airbag. Cooled.

By using the squib of the present invention, it is possible to manufacture a compact gas generator having stable output characteristics because of its excellent sealing strength, and the size of the gas generator for airbags is almost the same as that of the conventional shape. A generator can be easily provided.

Furthermore, a gas generator for a seatbelt pretensioner using the squib of the present invention will be described.

FIG. 8 shows a conceptual diagram of a gas generator (micro gas generator) for a seat belt pretensioner. As shown in the figure, the micro gas generator 31 has a squib 32 and a gas generating agent 33 therein, and the squib 32 is fixed to a holder 34 . Further, the cup body 35 for storing the gas generating agent 33 is also fixed to the holder by caulking, for example. When the squib 32 is actuated, the flame and hot particles from the squib 32 burn the gas generating agent 33 in the cup body 35 to generate gas.

Also in this micro gas generator, by using the squib of the present invention, it is possible to make a compact micro gas generator with stable output characteristics because the seal strength is excellent, and the shape is almost the same as the conventional shape. A micro gas generator of any size can easily be provided.

1 ignition charge, 2 holding member, 3 tubular body, 4, 5 terminal pin, 6 resin, 7 embolism,
7a contact surface, 8 first hole, 9 resin molding, 10 second hole, 11 opening,
12 resistor, 13 squib case, 14 uneven shape, 15 inner surface, 15a inner peripheral surface,
15b inner bottom surface, 16 adhesive tape, 16a base material, 16b adhesive layer, 17 unevenness,
20 jig, 20a jig concave portion, 21 airbag gas generator, 22 squib,
23 enhancer agent, 24 gas generating agent, 25 filter, 26 housing,
27 gas jet, 31 micro gas generator, 32 squib,
33 gas generating agent, 34 holder, 35 cup body, 100 igniter

Claims (2)

an ignition section defining an ignition chamber containing an ignition charge;
a pair of terminal pins;
A metallic holding member having a bottomed tubular shape and having a first hole through which one of the pair of terminal pins is inserted and a second hole through which the other terminal pin is inserted. and,
a resin molded body filled inside the holding member and insulating the one terminal pin from the holding member and the other terminal pin;
with
The inner surface of the holding member is formed with concave portions or convex portions by blasting or barrel processing,
The resin molding contains an epoxy resin,
The igniter, wherein the resin molded body is fixed by a concave portion or a convex portion provided on the inner surface of the holding member. 2. The igniter according to claim 1, wherein the inner diameter of said metal holding member is 10 mm or less.

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