JP5245178B2 - Igniter assembly and gas generator having the same - Google Patents

Description

  The present invention relates to an igniter assembly suitably used for an air bag device as an occupant protection device mounted on a vehicle or the like and a gas generator incorporated in a seat belt pretensioner, and a gas generator including the igniter assembly. More specifically, an igniter assembly including an igniter, a holder for fixing the igniter to the housing, and a resin molding part for fixing the igniter to the holder, and the same are provided. It relates to a gas generator.

  A gas generator that instantaneously generates gas when a vehicle or the like collides is incorporated in an airbag device or a seat belt pretensioner as an occupant protection device. In the gas generator, the gas generating agent is accommodated in a metal housing. The igniter is assembled to the housing in which the gas generating agent is accommodated, and the assembly structure is generally an assembly through a metal holder. More specifically, the holder has a substantially cylindrical shape having a hollow opening, and an igniter is arranged and fixed in advance in the hollow opening of the holder, and the holder to which the igniter is assembled is fixed to the housing. By doing so, the igniter is assembled to the housing.

  Gas generators using such an igniter assembly include so-called disk-type gas generators, side airbag devices, and curtains that are preferably incorporated in driver seat airbag devices and the like equipped on steering wheels. There are so-called cylinder-type gas generators suitably incorporated in air bag devices, so-called micro gas generators (MGG) suitably incorporated in seat belt pretensioners and the like.

  There are various structures for assembling the igniter to the holder. For example, an assembly structure is known in which an igniter is assembled to a holder by injection molding (more specifically, insert molding) using a resin material as a raw material. When the assembly structure is adopted, an insulating fluid resin material is poured into the space between the igniter arranged in the hollow opening of the holder and the holder, and the resin molded part is solidified by pouring it. Is formed, and the resin molded part is fixed to the surface of the igniter and the surface of the holder, respectively, so that the igniter is fixed to the holder. That is, when the assembly structure is adopted, an igniter assembly includes an igniter, a holder for fixing the igniter to the housing, and a resin molding portion for fixing the igniter to the holder. Will be configured.

  References disclosing an igniter assembly having the above-described configuration include, for example, Japanese Unexamined Patent Application Publication No. 2003-161599 (Patent Reference 1), Japanese Unexamined Patent Application Publication No. 2004-293835 (Patent Reference 2), and Japanese Unexamined Patent Application Publication No. 2006-234369. No. publication etc. are known. In each of the igniter assemblies disclosed in Patent Documents 1 to 3, the igniter is fixed to the holder by a resin molding portion formed by injection molding.

  By the way, when the igniter is fixed to the holder by the resin molding part formed by injection molding, at the interface between the resin molding part and the igniter and at the interface between the resin molding part and the holder, respectively. It is necessary to ensure sealing performance in the long term. This is to prevent the gas generating agent accommodated in the housing from absorbing moisture. If the sealing performance at the interface is insufficient, moisture is introduced into the housing through the portion. As a result, the gas generating agent absorbs moisture. If such moisture absorption occurs, there may be a problem that a desired gas output cannot be obtained during operation of the gas generator, which may impair the reliability of the gas generator.

  In order to ensure the sealing performance, it is conceivable to secure a long margin for fixing the resin molded portion and the igniter in the axial direction of the holder and for fixing the resin molded portion and the holder. However, in the case of such a configuration, there is a problem that peeling occurs at the interface based on a temperature change during injection molding and in a subsequent use environment due to a difference in linear expansion coefficient between these members. Can occur. In the case where such peeling occurs, conversely, the sealing performance of the part is lowered, and the reliability of the gas generator is adversely affected.

  On the other hand, in order not to cause the above-described peeling problem, if the fixing distance between the resin molding portion and the igniter in the axial direction of the holder and the fixing margin between the resin molding portion and the holder are shortened, ignition of the resin molding portion is performed. The adhesion area with respect to the vessel and the holder is reduced, and there may be a problem that the sealing performance is not sufficiently ensured. Even in this case, the reliability of the gas generator is lowered.

  Thus, in the igniter assembly that employs the structure in which the igniter is fixed to the holder by the resin molding portion formed by injection molding, the interface between the resin molding portion and the igniter and the resin molding There has been a problem that it is difficult to reliably ensure the sealing performance in the long term at each of the interfaces between the part and the holder.

  As literatures disclosing the assembly structure of an igniter assembly improved to solve such problems, for example, Utility Model Registration No. 3134281 (Patent Document 4) and Utility Model Registration No. 3134430 (Patent Document 5). Among these, in Patent Document 4, an annular protrusion is formed on the inner peripheral surface of the holder, and a cylindrical protrusion that protrudes in the axial direction of the holder is provided on the annular protrusion, and the annular protrusion and the cylindrical protrusion are provided. An igniter assembly is disclosed in which a resin molded part is formed so as to cover the part. On the other hand, Patent Document 5 discloses an igniter assembly in which convex portions or concave portions are provided along the circumferential direction on the axial end surface of the holder, and a resin molded portion is formed so as to cover these convex portions or concave portions. Has been.

JP 2003-161599 A JP 2004-293835 A JP 2006-234369 A Utility Model Registration No. 3134281 Utility Model Registration No. 3134430

  When the assembly structure of the igniter assembly as disclosed in Patent Documents 4 and 5 is adopted, when the assembly structure of the igniter assembly as disclosed in Patent Documents 1 to 3 is employed. In comparison, although the effect of maintaining high sealing performance is obtained, further improvement is still desired in order to ensure the sealing performance over a long period of time.

  Therefore, the present invention has been made to solve the above-described problems, and even when a structure in which an igniter is fixed to a holder by a resin molded portion formed by injection molding is used, the sealing is performed for a long period of time. It is an object of the present invention to provide an igniter assembly and a gas generator equipped with the igniter assembly that can ensure the reliability.

  An igniter assembly according to the present invention includes a substantially cylindrical metal holder including a hollow opening, an igniter disposed in the hollow opening of the holder, and a space between the holder and the igniter. An insulative fluid resin material is poured into the substrate to solidify it, and a resin molding part for fixing the igniter to the holder by being fixed to the surface of the holder and the surface of the igniter. I have. The holder has an annular projecting portion extending along the circumferential direction and projecting inward on the inner circumferential surface, and the annular projecting portion opens in the axial direction of the holder. An annular groove portion extending along the circumferential direction is included. Inside the annular groove portion, there is provided a resin seal portion that is formed by applying a liquid resin material to the annular groove portion and curing it, and is fixed to the surface of the annular groove portion along the circumferential direction. The resin molded portion is fixed to the inner peripheral surface of the holder in a state where at least the resin seal portion is completely covered.

  In the igniter assembly according to the present invention, it is preferable that the fixing force of the resin seal portion to the holder is larger than the fixing force of the resin molding portion to the holder.

  In the igniter assembly according to the present invention, it is preferable that the resin seal portion is richer in elasticity than the resin molding portion.

  In the igniter assembly according to the present invention, the resin seal part preferably contains at least one resin material selected from the group consisting of a cyanoacrylate resin and a silicone resin as a main raw material. Moreover, it is preferable that the said resin molding part contains the polyamide-type resin as a main raw material.

  In the igniter assembly according to the present invention, the igniter includes an igniter in which an igniting agent that ignites during operation is accommodated, and a terminal connected to the igniting unit to ignite the igniting agent. In the case of including a pin, it is preferable that a part of the ignition part is disposed so as to protrude outward from one axial end face of the holder. From the inner peripheral surface of the portion of the holder facing the ignition part, the one axial end surface of the holder, the outer peripheral surface of the portion of the ignition unit facing the holder, and the one axial end surface of the holder Further, it is preferable that at least the outer peripheral surface of the ignition portion is fixed to a portion protruding outward.

  In the igniter assembly according to the present invention, it is preferable that a convex portion projecting in the axial direction of the holder is located on the one axial end surface of the holder. The convex portion is preferably covered with the resin molded portion.

  In the igniter assembly according to the present invention, it is preferable that a concave portion recessed in the axial direction of the holder is located on the one axial end surface of the holder, and in that case, It is preferable that the concave portion is covered with the resin molded portion.

  A gas generator according to the present invention includes the above-described igniter assembly, a housing in which the igniter assembly is assembled, and a gas generating agent accommodated in the housing.

  According to the present invention, even when a structure in which an igniter is fixed to a holder by a resin molding portion formed by injection molding is employed, an igniter assembly capable of reliably ensuring sealing performance for a long period of time and the igniter assembly. It can be set as the gas generator provided with.

It is sectional drawing of the igniter assembly in Embodiment 1 of this invention. It is a schematic diagram which shows the outline | summary of the testing machine used for the verification test. It is a table | surface which shows the result of a verification test. It is sectional drawing of the igniter assembly which concerns on the 1st modification of Embodiment 1 of this invention. It is sectional drawing of the igniter assembly which concerns on the 2nd modification of Embodiment 1 of this invention. It is sectional drawing of the igniter assembly which concerns on the 3rd modification of Embodiment 1 of this invention. It is sectional drawing of the disk type gas generator in Embodiment 2 of this invention. It is sectional drawing of the disk type gas generator which concerns on the modification of Embodiment 2 of this invention. It is sectional drawing of the cylinder type gas generator in Embodiment 3 of this invention. It is sectional drawing of the micro gas generator in Embodiment 4 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, first, the igniter assembly in the embodiment of the present invention will be described, and then the gas generator in the embodiment of the present invention in which the igniter assembly is incorporated will be described. I decided to.

(Embodiment 1)
FIG. 1 is a cross-sectional view of an igniter assembly according to Embodiment 1 of the present invention. As shown in FIG. 1, the igniter assembly 1 </ b> A according to the present embodiment includes a holder 10, an igniter 20, a resin molding portion 30, and a resin seal portion 40. The holder 10 has a hollow opening 11 extending in the axial direction, and the igniter 20 disposed in the hollow opening 11 is provided so as to fill a space between the holder 10 and the igniter 20. The resin molded part 30 is fixed to the holder 10.

  The igniter 20 is an ignition device for generating a flame, and includes an ignition unit 21 and a terminal pin 22. The ignition unit 21 includes an igniting agent that ignites during operation and a resistor for burning the igniting agent. The terminal pin 22 is connected to the ignition unit 21 in order to ignite the igniting agent. More specifically, the igniter 20 includes a base portion through which a pair of terminal pins 22 are inserted and held, and a squib cup attached to the base portion, and the tip of the terminal pin 22 inserted into the squib cup. A resistor (bridge wire) is attached so as to connect the squib cups, and an igniting agent is filled in the squib cup so as to surround the resistor or in contact with the resistor. The squib cup forms an outer peripheral surface 21a and a top surface of the ignition unit 21, and is generally formed of a metal or plastic member.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 22. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition powder starts to burn upon receiving this heat. The high temperature flame generated by the combustion ruptures the squib cup containing the igniting agent. The time from when the current flows through the resistor until the igniter 20 is activated is 3 milliseconds or less when a nichrome wire is used as the resistor.

  The igniter 20 is disposed so that a part of the igniter 21 protrudes outward from one end face (end face located on the upper side in the drawing) 12 located in the axial direction of the holder 10. That is, the igniter 20 has a portion near the bottom surface to which the terminal pin 22 of the ignition unit 21 is connected located inside the hollow opening 11 of the holder 10 and the terminal pin 22 of the ignition unit 21 to which the terminal pin 22 is not connected. The portion close to the surface is arranged with respect to the holder 10 so as to protrude from the hollow opening 11 of the holder 10.

  As described above, the holder 10 is configured by a cylindrical member having a hollow opening 11 extending in the axial direction, and is formed by a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy, for example. ing. Here, the inner peripheral surface 10a that defines the hollow opening 11 of the holder 10 is formed in a generally curved shape so that the inner diameter of the hollow opening 11 changes in the axial direction.

  The holder 10 has an annular projecting portion 13 that extends along the circumferential direction on the inner peripheral surface 10a and projects inward. The annular protrusion 13 a is provided at a substantially central portion in the axial direction of the hollow opening 11. Further, in the vicinity of the distal end portion of the annular projecting portion 13 in the projecting direction, a cylindrical projecting portion 13 a projecting along the axial direction of the holder 10 is erected. The cylindrical protruding portion 13a protrudes along the axial direction of the holder 10 toward the end surface (the end surface positioned on the lower side in the drawing) of the holder 10 located on the side opposite to the end surface 12, thereby forming an annular shape. On the side surface on the lower end side of the protruding portion 13, an annular groove portion 14 that opens toward the axial direction of the holder 10 is provided. The annular groove 14 extends in the circumferential direction of the holder 10 so as to extend along the extending direction of the annular protrusion 13.

  A resin seal portion 40 is located inside the annular groove portion 14. The resin seal portion 40 is annularly provided along the circumferential direction of the annular groove portion 14, and is fixed to the surface of the annular groove portion 14. The resin seal portion 40 is a part for securing a sealing property in the portion by being fixed to the surface of the annular groove portion 14 which is a part of the holder 10, and a liquid resin material is applied to the annular groove portion 14. Is formed by curing. As a raw material for the resin seal portion 40, a resin material excellent in heat resistance, durability, corrosion resistance, and the like after curing is preferably selected and used. For example, a cyanoacrylate resin or a silicone resin is particularly preferably used. Is done. In addition to the resin materials described above, the resin seal portion 40 includes phenolic resins, epoxy resins, melamine resins, urea resins, polyester resins, alkyd resins, polyurethane resins, polyimide resins, polyethylene. Resin, polypropylene resin, polyvinyl chloride resin, polystyrene resin, polyvinyl acetate resin, polytetrafluoroethylene resin, acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, acrylic resin, polyamide resin, polyacetal Resin, polycarbonate resin, polyphenylene ether resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyolefin resin, polyphenylene sulfide resin, polysulfone resin, polyester Terusarufon resins, polyarylate resins, polyether ether ketone resin, polyamide-imide resin, liquid crystal polymer, etc. are available.

  As described above, the resin molding part 30 is positioned so as to fill a space between the igniter 20 disposed in the hollow opening 11 of the holder 10 and the holder 10. The resin molding part 30 includes a filling part 31 corresponding to a part located inside the hollow opening part 11 of the holder 10, and the filling part 31 completely covers the annular protruding part 13 provided in the holder 10. Is provided. Thereby, the resin seal part 40 located in the annular groove part 14 is completely covered by this resin molding part 30. More specifically, the filling portion 31 is fixed to the inner peripheral surface 10 a of the holder 10, the surface of the resin seal portion 40, and the outer peripheral surface 21 a near the bottom surface of the ignition portion 21 of the igniter 20.

  In addition, the filling portion 31 near the end surface on the lower end side that is located on the opposite side of the end surface 12 on the upper end side of the holder 10 is provided with a recess 33 that is recessed in the axial direction. The terminal pin 22 of the igniter 20 is exposed in the recess 33. The recess 33 is a female connector (not shown) to which a male connector of a harness that transmits a signal from a collision detection sensor is connected to the gas generator after the igniter assembly 1A is incorporated into the gas generator. Is installed.

  The resin molding part 30 is formed by pouring an insulating fluid resin material into the space between the holder 10 and the igniter 20 and solidifying it. That is, the resin molding part 30 is formed by injection molding (more specifically, insert molding). As a raw material of the resin molding part 30 formed by injection molding, a resin material excellent in heat resistance, durability, corrosion resistance and the like after curing is suitably selected and used. In that case, the resin is not limited to a thermosetting resin typified by an epoxy resin, but a polybutylene terephthalate resin, a polyethylene terephthalate resin, a polyamide resin (for example, nylon 6 or nylon 66), a polypropylene sulfide resin, a polypropylene oxide. It is also possible to use a thermoplastic resin typified by a series resin. When these thermoplastic resins are selected as raw materials, it is preferable to contain glass fibers or the like as fillers in these resin materials in order to ensure the mechanical strength of the resin molded portion 30 after molding. However, when sufficient mechanical strength can be ensured with only the thermoplastic resin, it is not necessary to add the filler as described above.

  In the igniter assembly 1A according to the present embodiment described above, the axial fixing margin between the resin molding portion 30 and the holder 10 is the annular protrusion 13 and the annular groove portion 14 on the inner peripheral surface 10a of the holder 10. Is provided for a long time, the sealing performance at the portion is maintained high, and the cylindrical protruding portion 13a is formed on the annular protruding portion 13, so that the cylindrical protruding portion 13a is provided. Thus, an appropriate anchor effect is obtained, and adhesion at the interface between the resin molded portion 30 and the holder 10 is ensured. In addition, in the igniter assembly 1 </ b> A according to the present embodiment, an interface between the resin seal portion 40 and the holder 10 exists at an intermediate position between the resin molded portion 30 and the holder 10. In this part, higher sealing performance is exhibited. Moreover, this is sufficiently ensured also about the allowance in the axial direction between the igniter 20 and the resin molding part 30. FIG. Therefore, by adopting the above configuration, it is possible to provide an igniter assembly in which sealing performance is ensured for a long period of time.

  Further, as in the igniter assembly 1A according to the present embodiment, if the opening surface of the annular groove portion 14 in which the resin seal portion 40 is formed faces the axial direction of the holder 10, the resin seal portion 40 of the holder 10 is formed. Since the liquid resin material can be retained in the annular groove portion 14 until the liquid resin material is cured at the time of formation, the formation position and shape of the resin seal portion 40 can be made as desired. it can.

  Hereinafter, the reason why high sealing performance is exhibited by providing the resin seal portion 40 will be described in detail. As the resin seal portion 40 described above, a material having a larger fixing force with respect to the holder 10 than the fixing force with respect to the holder 10 of the resin molded portion 30 is selected, or due to the elasticity of the resin molded portion 30. A material having high elasticity is selected. When the former is selected, high adhesion to the holder 10 of the resin seal portion 40 ensures high adhesion at the interface between the resin seal portion 40 and the holder 10. Significant improvement in sealing performance is realized by the presence of the interface portion between the resin molded portion 30 and the holder 10. Further, when the latter is selected, the resin seal portion 40 is pressed and fixed to the surface of the holder 10 in a compressed state, so that high adhesion is provided at the interface between the resin seal portion 40 and the holder 10. Since this portion is present at the interface portion between the resin molded portion 30 and the holder 10, a significant improvement in sealing performance is realized, and an O-ring is substantially provided in the portion. The same effect as can be obtained. Here, in any case, since the resin seal portion 40 is formed prior to the injection molding of the resin molding portion 30, the molding pressure when molding the resin molding portion 30 is applied to the resin seal portion 40. As a result, the resin molding part 30 is molded while the molding pressure is maintained, whereby the adhesion of the resin seal part 40 to the holder 10 is enhanced. Therefore, the high sealing performance as described above is realized.

  Further, when a configuration such as the igniter assembly 1A in the present embodiment is adopted, as described above, a high molding pressure is applied to the resin seal portion 40 during the injection molding of the resin molding portion 30. However, in the igniter assembly 1A according to the present embodiment, the position where the resin seal portion 40 is formed is inside the annular groove portion 14 provided on the inner peripheral surface 10a of the holder 10, and thus the annular groove portion. The wall of the portion constituting the side surface of 14 (that is, the cylindrical protrusion 13a and the corner facing the cylindrical protrusion 13a) serves as a weir, and the resin seal at the time of injection molding of the resin molding portion 30 The influence of the molding pressure applied to the portion 40 can be weakened. Therefore, by adopting the above-described configuration, peeling of the resin seal portion 40 due to molding pressure can be prevented in advance. In addition to the above, in order to suppress the influence of the molding pressure applied to the resin seal portion 40, in addition to the above, for injecting a fluid resin material provided in the mold during the injection molding of the resin molding portion 30 It may be performed by adjusting the position of the gate.

  As described above, when the resin seal portion 40 is covered with the resin molded portion 30, in addition to the interface between the resin molded portion 30 and the holder 10 as an interface that may cause a leak. Moreover, the interface between the resin seal part 40 and the resin molding part 30 will also increase. However, in general, since the adhesion between the resin member and the resin member fixed to the resin member is significantly higher than the adhesion between the metal member and the resin member fixed to the metal member, the resin material described above is used. As long as is selected, there is no concern that peeling occurs at the interface portion and leakage occurs.

  Hereinafter, a verification test for confirming how much the sealing performance is improved when the configuration like the igniter assembly 1A in the present embodiment is adopted will be described. FIG. 2 is a schematic diagram showing an outline of a testing machine used for the verification test, and FIG. 3 is a table showing the test results.

  In the verification test, helium gas is blown to one axial end portion of an igniter assembly 1A as a test body, and at the same time, the other axial end portion of the igniter assembly 1A is evacuated to ignite the igniter assembly. This was done by detecting the amount of helium gas passing through 1A. Specifically, as shown in FIG. 2, the test machine 400 includes a helium gas cylinder 410 capable of supplying helium gas, a helium gas spray gun 420 for spraying helium gas supplied from the helium gas cylinder 410, By detecting a vacuum pump 430 for performing evacuation, a chamber 440 that is depressurized by the vacuum pump 430, a specimen setting jig 450 that includes a decompression flow path 451 communicating with the chamber 440, and an internal pressure of the chamber 440. A detector provided with detection means (not shown) for detecting the amount of helium gas introduced into the chamber 440 is prepared, and the igniter assembly 1A as a test body is sequentially set in the test body setting jig 450 described above. In each case, helium gas is sprayed using a helium gas spray gun 420 and a vacuum It performs evacuation by flop 430 was performed to confirm the sealability by measuring the amount of helium gas which is detected by the detecting means at that time. In addition, an O-ring (not shown) is interposed between the test body and the test body setting jig 450, and the O-ring is compressed by the test body and the test body setting jig 450, so that helium from the portion is compressed. Gas leakage was prevented.

  As a test body, in the cylinder type gas generator 1A as in the present embodiment shown in FIG. 1, the resin molded portion 30 is made of nylon 6 and the resin seal portion 40 is made of ethyl cyanoacrylate. In Example 1, the resin molded part 30 is made of nylon 6 and the resin seal part 40 is made of silicone resin, and the resin molded part 30 is not provided. A structure composed of nylon 6 and having a space between the holder 10 and the igniter 20 sealed only by the resin molding portion 30 was adopted as a comparative example. The number of test specimens according to Examples 1 and 2 and the comparative example was 8, and the above verification test was performed on a total of 24 of these three types.

As shown in FIG. 3, in the test body according to Example 1, the leak amount of helium gas is 5.5 × 10 ⁻⁹ atm · cc / s at the maximum, and 4.5 × 10 ⁻¹⁰ atm at the minimum. -It was cc / s. Further, in the specimen according to Example 2, the leak amount of helium gas is 3.5 × 10 ⁻⁹ atm · cc / s at the maximum and 7.4 × 10 ⁻¹⁰ atm · cc / s at the minimum. there were. On the other hand, in the test body according to the comparative example, the leak amount of helium gas was 2.1 × 10 ⁻⁵ atm · cc / s at the maximum and 1.0 × 10 ⁻⁶ atm · cc / s at the minimum. It was. Therefore, by adopting a configuration such as the igniter assembly according to the first and second embodiments, high sealing performance can be maintained for a longer period than when employing a configuration such as the igniter assembly according to the comparative example. It was confirmed that

  4 to 6 are sectional views of igniter assemblies according to first to third modifications of the present embodiment. Next, with reference to these FIG. 4 thru | or FIG. 6, the modification of the igniter assembly in this Embodiment is illustrated and demonstrated.

  The igniter assembly 1B according to the first modification shown in FIG. 4 is different from the igniter assembly 1A in the present embodiment described above in the shape of the annular groove portion 14. Specifically, in the above-described igniter assembly 1A according to the present embodiment, the annular groove portion is formed by extending the cylindrical protrusion portion 14 in the axial direction of the holder 10 from the tip portion of the annular protrusion portion 13 in the protruding direction. However, in the igniter assembly 1 </ b> B according to this modification, the annular groove portion 14 is formed by drilling a concave portion upward on the side surface on the lower end side of the annular projecting portion 13.

  Even in such a configuration, the resin seal portion 40 is formed inside the annular groove portion 14, and the resin molding portion 30 is formed so as to cover the resin seal portion 40. The same effect as that obtained when the igniter assembly 1A is obtained can be obtained. In addition, the shape of the annular groove 14 is not particularly limited as described above, and may be a gently depressed recess or a rectangular recess having a corner. Further, the annular groove portion 14 is not necessarily configured to open toward the lower end side as illustrated, and may be configured to open toward the upper end side.

  The igniter assembly 1C according to the second modification shown in FIG. 5 is different from the igniter assembly 1A in the present embodiment described above in the shape of the end face 12 on the upper end side of the holder 10 and the configuration of the resin molding portion 30. . Specifically, in the igniter assembly 1C according to the present modification, a convex portion 15 is provided on the end face 12 on the upper end side of the holder 10 so as to project in the axial direction. The resin molding part 30 is provided so that it may cover.

  The convex portion 15 provided on the end surface 12 on the upper end side of the holder 10 is provided on the inner peripheral edge of the end surface 12, and the axial height thereof is 1.0 mm or more and 1.5 mm or less. The convex portions 15 are provided continuously in the circumferential direction along the circumferential direction of the holder 10 or intermittently (dotted) in the circumferential shape.

  The resin molding part 30 includes a protrusion 32 in addition to the filling part 31. The protruding portion 32 corresponds to a portion of the resin molded portion 30 that is located outside the hollow opening 11 of the holder 10, and is close to the axial end surface 12 of the holder 10 and the top surface of the ignition portion 21 of the igniter 20. Each is fixed to the outer peripheral surface 21a.

  The protrusion 32 that is a part of the resin molding portion 30 is formed so as to cover the end surface 12 on the upper end side of the holder 10 as described above. Here, the protrusion 32 does not cover the entire end surface 12 on the upper end side of the holder 10, and covers only the inner peripheral side portion of the end surface 12. That is, a part of the end surface 12 on the upper end side of the holder 10 is covered with the protruding portion 32 of the resin molded portion 30, and the fixed region to which the protruding portion 32 of the resin molded portion 30 is fixed, and the resin molded portion 30. And an exposed region that is exposed without being covered by the protruding portion 32. The to-be-adhered region is located at a portion near the inner peripheral edge of the end surface 12 on the upper end side of the holder 10, and the exposed region is located at a portion near the outer peripheral edge of the end surface 12 on the upper end side of the holder 10.

  The convex portion 15 provided on the end surface 12 on the upper end side of the holder 10 is provided in the fixed region. Therefore, the convex portion 15 is completely covered by the protruding portion 32 of the resin molded portion 30. Therefore, the protruding portion 32 of the resin molded portion 30 is fixed to the side surface 15 a on the outer peripheral side of the convex portion 15.

  The protruding portion 32 that is a part of the resin molded portion 30 is set such that the axial height from the end surface 12 on the upper end side of the holder 10 is not less than 2 times and not more than 5 times the axial height of the convex portion 15. ing. That is, the axial height of the protruding portion 32 of the resin molded portion 30 is set based on the axial height of the convex portion 15, and the height is 2.0 mm at the minimum and 7.5 mm at the maximum. .

  By using the igniter assembly 1C having the above-described configuration, a convex portion having a height of 1.0 mm to 1.5 mm provided on the axial end surface 12 of the holder 10 on the side where the igniter 21 of the igniter 20 is disposed. Since the resin molding part 30 is provided so as to cover 15, an appropriate anchor effect can be obtained. Therefore, compared with the case of the above-described igniter assembly 1A in the present embodiment, the adhesion at the interface between the resin molded portion 30 and the holder 10 is more stably ensured, and the seal at the portion is sealed. Sex is more reliably maintained over a long period of time. In particular, by adopting the configuration as in this modification, the adhesion between the upper portion of the ignition portion 21 and the holder 10 is enhanced by the presence of the convex portion 15 provided on the holder 10, thereby obtaining an anchor effect. Further, the presence of the cylindrical protrusion 13a provided in the annular protrusion 13 enhances the adhesion between the lower part of the ignition part 21 and the terminal pin 22 and the holder 10 by obtaining an anchor effect, and as a result. As a result, the resin molding part 30 is hardly affected by external force, resin shrinkage, etc., and the igniter 20 is stably held and the sealing performance is synergistically secured.

  The igniter assembly 1D according to the third modification shown in FIG. 6 is different from the igniter assembly 1A in the present embodiment described above in the shape of the end surface 12 on the upper end side of the holder 10 and the configuration of the resin molding portion 30. . Specifically, in the igniter assembly 1 </ b> D according to this modification, a recess 16 is provided in the end surface 12 on the upper end side of the holder 10 so as to be recessed in the axial direction so as to cover the recess 16. The resin molding part 30 is provided.

  The recess 16 provided in the end surface 12 on the upper end side of the holder 10 is provided in a portion near the inner peripheral edge of the end surface 12, and the axial depth thereof is 1.0 mm or more and 1.5 mm or less. The concave portions 16 are provided continuously in a circumferential shape along the circumferential direction of the holder 10 or intermittently (dotted) in the circumferential shape.

  The resin molding part 30 includes a protrusion 32 in addition to the filling part 31. The protruding portion 32 corresponds to a portion of the resin molded portion 30 that is located outside the hollow opening 11 of the holder 10, and is close to the axial end surface 12 of the holder 10 and the top surface of the ignition portion 21 of the igniter 20. Each is fixed to the outer peripheral surface 21a.

  The protrusion 32 that is a part of the resin molding portion 30 is formed so as to cover the end surface 12 on the upper end side of the holder 10 as described above. Here, the protrusion 32 does not cover the entire end surface 12 on the upper end side of the holder 10, and covers only the inner peripheral side portion of the end surface 12. That is, a part of the end surface 12 on the upper end side of the holder 10 is covered with the protruding portion 32 of the resin molded portion 30, and the fixed region to which the protruding portion 32 of the resin molded portion 30 is fixed, and the resin molded portion 30. And an exposed region that is exposed without being covered by the protruding portion 32. The to-be-adhered region is located at a portion near the inner peripheral edge of the end surface 12 on the upper end side of the holder 10, and the exposed region is located at a portion near the outer peripheral edge of the end surface 12 on the upper end side of the holder 10.

  The recess 16 provided in the end surface 12 on the upper end side of the holder 10 is provided in the fixed region. Therefore, the recess 16 is completely embedded by the protrusion 32 of the resin molding part 30. Therefore, the protruding portion 32 of the resin molding portion 30 is fixed to the side surface 16 a on the inner peripheral side of the concave portion 16.

  The protruding portion 32 which is a part of the resin molded portion 30 is set such that the axial height from the end surface 12 on the upper end side of the holder 10 is 1 to 4 times the axial depth of the recess 16. Yes. That is, the axial height of the protruding portion 32 of the resin molded portion 30 is set based on the axial depth of the concave portion 16, and the height is 1.0 mm at the minimum and 6.0 mm at the maximum.

  By adopting the igniter assembly 1D having the above-described configuration, the recess 16 having a depth of 1.0 mm to 1.5 mm provided on the axial end surface 12 of the holder 10 on the side where the igniter 21 of the igniter 20 is disposed. Since the resin molding part 30 is provided so as to cover the surface, an appropriate anchor effect can be obtained. Therefore, compared with the case of the above-described igniter assembly 1A in the present embodiment, the adhesion at the interface between the resin molded portion 30 and the holder 10 is more stably ensured, and the seal at the portion is sealed. Sex is more reliably maintained over a long period of time. In particular, by adopting the configuration as in the present modification, the adhesion between the upper portion of the ignition unit 21 and the holder 10 is enhanced by the presence of the recess 16 provided in the holder 10 to obtain an anchor effect. In addition, the presence of the cylindrical projecting portion 13a provided in the annular projecting portion 13 enhances the adhesion between the lower portion of the ignition portion 21 and the terminal pin 22 and the holder 10, and as a result, The resin molding part 30 is hardly affected by external force, resin shrinkage, etc., and the igniter 20 is stably held and the sealing performance is synergistically secured.

(Embodiment 2)
FIG. 7 is a cross-sectional view of a disk-type gas generator according to Embodiment 2 of the present invention. The disk-type gas generator in the present embodiment is a gas generator including the igniter assembly in the first embodiment of the present invention described above, such as an airbag device for a driver's seat installed in a steering wheel. The gas generator is preferably incorporated into the gas generator.

  As shown in FIG. 7, the disc-type gas generator 100A in the present embodiment has a short cylindrical housing in which both axial ends are closed. The short cylindrical housing is formed by an initiator shell 110 and a closure shell 120 formed in a bottomed cylindrical shape, and a holder 10 of an igniter assembly 1A assembled to the initiator shell 110. Each of the initiator shell 110 and the closure shell 120 is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. For joining the initiator shell 110 and the closure shell 120, electron beam welding, laser welding, friction welding, or the like is preferably used.

  The igniter assembly 1A is assembled to the initiator shell 110 as described above. More specifically, the igniter assembly 1A is inserted from the inside into an opening provided at a substantially central portion of the bottom plate portion of the initiator shell 110, and the holder 10 of the inserted igniter assembly 1A is attached to the initiator shell. By joining to 110, the igniter assembly 1A is fixed to the housing. Here, the igniter assembly 1A is assembled so that the igniter of the igniter 20 is positioned inside the housing. Electron beam welding, laser welding, friction welding, resistance welding, or the like is suitably used for joining the holder 10 and the initiator shell 110 of the igniter assembly 1A.

  A bottomed cylindrical enhancer cup 130 is fixed to the igniter assembly 1 </ b> A so as to cover the ignition part of the igniter 20. The enhancer cup 130 has a fire transfer chamber 134 in which a charge transfer agent 135 is accommodated therein, and the holder 10 of the igniter assembly 1 </ b> A so that the heat transfer chamber 134 faces the ignition part of the igniter 20. Extrapolated and fixed to More specifically, the enhancer cup 130 is fixed to the igniter assembly 1 </ b> A by caulking the flange portion 131 provided on the enhancer cup 130 by the caulking portion 17 a provided on the holder 10. The enhancer cup 130 has an opening 132 in the peripheral wall portion, and a seal member 133 is affixed to the enhancer cup 130 so as to close the opening 132. As the seal member 133, an aluminum foil or the like having an adhesive member applied on one side is used.

  A combustion chamber 140 in which the gas generating agent 141 is accommodated is located in a space surrounding the portion where the enhancer cup 130 is arranged in a space inside the housing including the initiator shell 110 and the closure shell 120. . Further, a filter 150 is disposed along the inner periphery of the housing in a space surrounding the combustion chamber 140 in which the gas generating agent 141 is accommodated. The filter 150 has a cylindrical shape, and the central axis thereof is disposed so as to substantially coincide with the axial direction of the housing. As the filter 150, for example, a wire made of a metal such as stainless steel or steel, a wire wound around a mesh, or a material pressed by pressing is used. Specifically, a knitted wire mesh, a plain weave wire mesh, an assembly of crimped metal wires, or the like is used.

  A plurality of gas outlets 121 are provided on the peripheral wall of the closure shell 120 that faces the filter 150. A seal member 122 is affixed to a main surface located on the filter 150 side of the peripheral wall portion of the closure shell 120 so as to close the gas ejection port 121. As the sealing member 122, an aluminum foil or the like having an adhesive member applied on one side is used.

  To prevent the residue from flowing out from the gap between the filter 150 and the closure shell 120 without passing through the filter 150 at the end of the combustion shell 140 on the top plate side of the closure shell 120. The residue outflow prevention member 152 is disposed. On the other hand, at the end of the combustion chamber 140 on the bottom plate side of the initiator shell 110, the residue is prevented from flowing out from the gap between the filter 150 and the initiator shell 110 without passing through the filter 150. The residue outflow prevention member 154 for this is arrange | positioned. As these residue outflow prevention members 152 and 154, steel plates such as ordinary steel and special steel are used. A cushion material 153 is disposed inside the residue outflow prevention member 152 so as to come into contact with the gas generating agent 141 accommodated in the combustion chamber 140. The cushion material 153 is provided for the purpose of preventing the gas generating agent 141 made of a molded body from being pulverized by vibration or the like, and a ceramic fiber molded body, silicon foam, or the like is preferably used.

  The disc-type gas generator 100A having the above configuration generates gas when the igniter 20 assembled to the igniter assembly 1A is operated. Specifically, the transfer agent 135 accommodated in the transfer chamber 134 is ignited and burned by the flame generated by the operation of the igniter 20, and generates a large amount of heat particles. The generated heat particles break the seal member 133 and flow into the combustion chamber 140, and the gas generating agent 141 accommodated in the combustion chamber 140 is burned to generate a large amount of working gas. The working gas generated in the combustion chamber 140 passes through the filter 150. At that time, heat is taken away by the filter 150 and cooled, and the residue contained in the working gas is removed by the filter 150, so that the outer peripheral edge of the housing. Flow into the department. The working gas that has reached the outer peripheral edge of the housing breaks the seal member 122 and is ejected from the gas ejection port 121 to the outside of the housing. The ejected gas is introduced into an airbag provided adjacent to the disc-type gas generator 100A, and the airbag is inflated and deployed.

  With the disc-type gas generator 100A as described above, the gas-generating agent 141 does not absorb moisture and the desired gas output can be obtained because the sealing performance is reliably ensured over a long period of time. It can be a generator. In the present embodiment, the disk-type gas generator 100A having the structure in which the igniter assembly 1A in the first embodiment of the present invention is incorporated is described as an example. It is also possible to incorporate the igniter assemblies 1B to 1D according to the first to third modifications of the embodiment of the invention into a disk type gas generator.

  FIG. 8 is a cross-sectional view of a disk-type gas generator according to a modification of the present embodiment. In the disk-type gas generator 100A in the present embodiment described above, the case where the holder 10 and the initiator shell 110 are configured separately is illustrated, but in the disk-type gas generator 100B according to the present modification, These are integrated. That is, as shown in FIG. 8, in the disc-type gas generator 100B according to this modification, the holder 10 and the initiator shell 110 are integrated by providing the holder 10 with a bottomed cylindrical initiator shell portion 18. In this way, the number of parts is reduced. Even when configured in this manner, the same effects as those obtained when the disk-type gas generator 100A in the present embodiment is used can be obtained.

(Embodiment 3)
FIG. 9 is a cross-sectional view of a cylinder type gas generator in Embodiment 3 of the present invention. The cylinder type gas generator in the present embodiment is a gas generator including the igniter assembly in the first embodiment of the present invention described above, and is suitable for a side airbag device, a curtain airbag device, or the like. It is a built-in gas generator.

  As shown in FIG. 9, the cylinder type gas generator 200 in the present embodiment has a long cylindrical housing in which both ends in the axial direction are closed. The long cylindrical housing includes a cylindrical member 210 having both ends opened, a closing member 220 assembled to the cylindrical member 210 so as to close an opening on one end side of the cylindrical member 210, and the cylindrical member 210. It is formed by the holder 10 of the igniter assembly 1A assembled to the cylindrical member 210 so as to close the opening on the other end side. The cylindrical member 210 and the closing member 220 are each formed of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. Part of the closing member 220 is inserted into the opening on one end side of the cylindrical member 210, and the cylindrical member 210 corresponding to the portion where the closing member 220 is inserted is directed radially inward. The closing member 220 is fixed to the cylindrical member 210 by being caulked.

  The igniter assembly 1A is assembled to the cylindrical member 210 as described above. More specifically, the igniter assembly 1A is partially inserted in the opening on the other end side of the cylindrical member 210, and corresponds to a portion where the igniter assembly 1A is inserted. The igniter assembly 1 </ b> A is fixed to the cylindrical member 210 by caulking the partial cylindrical member 210 toward the radially inner side. Here, a circumferentially extending groove 19 is provided on the outer peripheral surface of the holder 10 of the igniter assembly 1A, and an O-ring 238 is fitted in the groove 19 as a seal member.

  A bottomed cylindrical enhancer cup 230 is fixed to the igniter assembly 1 </ b> A so as to cover the ignition part of the igniter 20. The enhancer cup 230 has a heat transfer chamber 234 in which a charge transfer agent 235 is accommodated, and the holder 10 of the igniter assembly 1 </ b> A so that the heat transfer chamber 234 faces the ignition part of the igniter 20. It is fixed to. More specifically, the enhancer cup 230 is fixed to the igniter assembly 1A by caulking the flange portion 231 provided on the enhancer cup 230 by the caulking portion 17b provided on the axial end surface of the holder 10. . A score as a fragile portion is formed on the top wall portion of the enhancer cup 230 as necessary.

  A cushion material 253 is inserted inside the cylindrical member 210. The cushion material 253 is inserted into the cylindrical member 210 so as to contact the top wall portion of the enhancer cup 230 described above. The cushion material 253 partitions the space inside the cylindrical member 210 into an ignition chamber 244 and a combustion chamber 240. A gas generating agent 241 is accommodated in the combustion chamber 240. The cushion material 253 is provided for the purpose of preventing the gas generating agent 241 made of a molded body from being pulverized by vibration or the like, and a ceramic fiber molded body, silicon foam, or the like is preferably used.

  A partition member 245 is inserted and fixed inside the cylindrical member 210. The partition member 245 clamps the peripheral edge of the partition member 245 in the axial direction by caulking the cylindrical member 210 of the portion adjacent to the portion where the partition member 245 is inserted toward the inside in the radial direction. Is fixed to the cylindrical member 210. The partition member 245 partitions the space inside the cylindrical member 210 into a combustion chamber 240 and a filter chamber 242. The partition member 245 is configured by a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.

  The partition member 245 has a communication hole 246 at the center thereof. A seal member 247 is affixed to the main surface of the partition member 245 located on the combustion chamber 240 side so as to close the communication hole 246. As the sealing member 247, an aluminum foil or the like having an adhesive member applied on one side is used. A perforated plate 248 having a plurality of holes 249 is inserted at the end of the combustion chamber 240 on the side where the partition member 245 is located. The perforated plate 248 rectifies the flow of gas released from the combustion chamber 240 during operation and prevents the gas generating agent 241 stored in the combustion chamber 240 from moving to the filter chamber 242 in an unburned state. Is for.

  A filter 250 is accommodated in the filter chamber 242. The filter 250 is made of a cylindrical member having a hollow opening 251 extending in the same direction as the axial direction of the cylindrical member 210. The filter 250 is made of, for example, a wire or net made of a metal such as stainless steel or steel, or one that is pressed and hardened by pressing. Specifically, a knitted wire mesh, a plain weave wire mesh, an assembly of crimped metal wires, or the like is used. A plurality of gas outlets 221 are provided on the peripheral wall portion of the cylindrical member 210 facing the filter 250.

  The cylinder type gas generator 200 configured as described above generates gas when the igniter 20 assembled to the igniter assembly 1A is operated. Specifically, the transfer charge 235 accommodated in the transfer chamber 234 is ignited and burned by the flame generated by the operation of the igniter 20 to generate a large amount of heat particles. The generated heat particles open the enhancer cup 230 and flow into the combustion chamber 240, and burn the gas generating agent 241 stored in the combustion chamber 240 to generate a large amount of working gas. The working gas generated in the combustion chamber 240 breaks the seal member 247 and flows into the filter chamber 242 and passes through the filter 250. At this time, heat is taken away by the filter 250, and the working gas is cooled. The contained residue is removed by the filter 250 and flows into the outer peripheral edge of the housing corresponding to the filter chamber 242. The working gas that has reached the outer peripheral edge of the housing corresponding to the filter chamber 242 is ejected to the outside of the housing via the gas ejection port 221. The jetted gas is introduced into an airbag provided adjacent to the cylinder type gas generator 200, and the airbag is inflated and deployed.

  If the cylinder type gas generator 200 as described above is used, the cylinder type gas that can ensure the sealing performance for a long period of time and does not absorb moisture in the gas generating agent 241 and can obtain a desired gas output. It can be a generator. Further, if the above configuration is adopted, the outer peripheral surface of the protruding portion of the resin molding portion 30 of the igniter assembly 1A is not directly in contact with the inner peripheral surface of the cylindrical member 210 which is a part of the housing. Even when an external force is applied to the resin, there is no possibility that the resin molding portion 30 is damaged and the sealing performance is not impaired. In the present embodiment, the cylinder type gas generator 200 having the structure incorporating the igniter assembly 1A in the first embodiment of the present invention has been described as an example. It is also possible to incorporate the igniter assemblies 1B to 1D according to the first to third modifications of the embodiment of the invention into a cylinder type gas generator.

(Embodiment 4)
FIG. 10 is a cross-sectional view of the micro gas generator in the fourth embodiment of the present invention. The micro gas generator according to the present embodiment is a gas generator including the igniter assembly according to the first embodiment of the present invention described above, and is preferably incorporated in a seat belt pretensioner or the like. It is.

  As shown in FIG. 10, the micro gas generator 300 in the present embodiment has a housing constituted by a bottomed cylindrical cup-shaped member 310 and the holder 10 of the igniter assembly 1A. . The cup-shaped member 310 has a combustion chamber 340 in which a gas generating agent 341 is accommodated, and the holder 10 of the igniter assembly 1 </ b> A so that the combustion chamber 340 faces the ignition part of the igniter 20. It is fixed to. More specifically, the flange portion 314 provided on the cup-shaped member 310 is caulked by the caulking portion 17c provided on the outer peripheral portion of the holder 10, whereby the cup-shaped member 310 is fixed to the igniter assembly 1A. Yes. A score as a fragile portion is formed on the outer surface of the cup-shaped member 310 as necessary. The cup-shaped member 310 is composed of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.

  The micro gas generator 300 configured as described above generates gas when the igniter 20 assembled to the igniter assembly 1A is operated. Specifically, the gas generating agent 341 housed in the combustion chamber 340 is ignited and burned by a flame generated by the operation of the igniter 20, and a large amount of working gas is generated. The working gas generated in the combustion chamber 340 opens the cup-shaped member 310 and is ejected to the outside of the housing. The jetted gas is introduced into the working space of the seat belt pretensioner in which the micro gas generator is incorporated, and is used for the seat belt winding operation.

  If the micro gas generator 300 as described above is used, the gas generating agent 341 does not absorb moisture because the sealing property is surely ensured for a long period of time, and a desired gas output can be obtained. -It can be a generator. In the present embodiment, the micro gas generator 300 having the configuration in which the igniter assembly 1A in the first embodiment of the present invention described above is incorporated is described as an example. It is also possible to incorporate the igniter assemblies 1B to 1D according to the first to third modifications of the embodiment of the invention into a micro gas generator.

  As described above, the above-described embodiments and modifications thereof disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1A to 1D igniter assembly, 10 holder, 10a inner peripheral surface, 11 hollow opening, 12 end surface, 13 annular projection, 13a cylindrical projection, 14 annular groove, 15 projection, 15a side, 16 recess, 16a Side, 17a to 17c Caulking part, 18 Initiator shell part, 19 Groove, 20 Igniter, 21 Ignition part, 21a Outer peripheral surface, 22 Terminal pin, 30 Resin molding part, 31 Filling part, 32 Protruding part, 33 Concave part, 40 Resin Seal part, 100A, 100B disk type gas generator, 110 initiator shell, 120 closure shell, 121 gas outlet, 122 seal member, 130 enhancer cup, 131 flange part, 132 opening part, 133 seal member, 134 heat transfer chamber, 135 Gunpowder, 140 Combustion chamber, 141 Gas generant, 150 Filter, 152 Residue outflow prevention member, 153 Cushion material, 154 Residue outflow prevention member, 200 Cylinder type gas generator, 210 Cylindrical member, 211 Gas outlet, 220 Closure member, 230 Enhancer cup, 231 Flange, 234 Chamber, 235 transfer agent, 238 O-ring, 240 combustion chamber, 241 gas generating agent, 242 filter chamber, 244 ignition chamber, 245 partition member, 246 communication hole, 247 seal member, 248 perforated plate, 249 hole, 250 filter, 251 Hollow opening, 253 Cushion material, 300 Micro gas generator, 310 Cup-shaped member, 314 Flange, 340 Combustion chamber, 341 Gas generating agent, 400 Test machine, 410 Helium gas cylinder, 420 Helium gas spray gun, 430 Vacuum Pong , 440 chamber, 450 specimen setting jig, 451 vacuum passage.

Claims (8)

A substantially cylindrical metal holder including a hollow opening;
An igniter disposed in the hollow opening of the holder;
An insulating fluid resin material is poured into the space between the holder and the igniter to solidify the material, and the igniter is fixed to the surface of the holder and the surface of the igniter. An igniter assembly including a resin molding portion for fixing the holder to the holder,
The holder has an annular protrusion on its inner peripheral surface that extends along the circumferential direction and protrudes inward.
The annular protrusion includes an annular groove that opens in the axial direction of the holder and extends along the circumferential direction,
Inside the annular groove is formed by applying a liquid resin material to the annular groove and curing it, and is provided with a resin seal part that adheres to the surface of the annular groove along the circumferential direction,
The igniter assembly, wherein the resin molding portion is fixed to the inner peripheral surface of the holder in a state where at least the resin seal portion is completely covered.   The igniter assembly according to claim 1, wherein a fixing force of the resin seal portion to the holder is larger than a fixing force of the resin molding portion to the holder.   The igniter assembly according to claim 1 or 2, wherein the resin seal portion is richer in elasticity than the resin molding portion. The resin seal part includes, as a main raw material, at least one resin material selected from the group consisting of a cyanoacrylate resin and a silicone resin,
The igniter assembly according to any one of claims 1 to 3, wherein the resin molding part includes a polyamide-based resin as a main raw material. The igniter includes an igniter that contains an igniting agent that ignites during operation, and a terminal pin connected to the igniting unit to ignite the igniting agent,
The ignition part is disposed so that a part thereof protrudes outside the one axial end face of the holder,
The resin molded portion includes an inner peripheral surface of a portion of the holder that faces the ignition portion, an end surface in the one axial direction of the holder, an outer peripheral surface of a portion of the ignition portion that faces the holder, and the holder The igniter assembly according to any one of claims 1 to 4, wherein the igniter assembly is fixed to at least an outer peripheral surface of the igniter at a portion protruding outward from the one axial end surface. On the one axial end face of the holder, a convex portion that is convex toward the axial direction of the holder is located,
The igniter assembly according to claim 5, wherein the convex portion is covered with the resin molding portion. On the one axial end surface of the holder, a concave portion that is recessed toward the axial direction of the holder is located,
The igniter assembly according to claim 5, wherein the recess is covered with the resin molding portion. An igniter assembly according to any of claims 1 to 7;
A housing in which the igniter assembly is assembled;
A gas generator comprising a gas generating agent housed in the housing.

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