JP2009137402A - Gas producer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas producer which is manufactured at low cost and capable of easily ensuring the airtightness between a housing and a holder. <P>SOLUTION: The gas producer 1A comprises a housing 10, a holder 21, an igniter 30, and a resin-formed part 40. The housing 10 includes a combustion chamber 17 storing a gas generating agent 62 therein. The holder 21 is fitted to the housing 10 while being inserted in an opening end in the axial direction of the housing 10 so as to face the combustion chamber 17. The igniter 30 is fixed to the holder 21 while an ignition unit 31 is located on the combustion chamber 17 side. The resin-formed part 40 is fixed to a surface of the holder 21 and a surface of the igniter 30 to fix the igniter 30 to the holder 21. The resin-formed part 40 is fixed to an outer circumferential surface 23 of the holder 21, and interposed between the housing 10 and the holder 21, and includes a seal part 43 for sealing a space therebetween. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted on an automobile or the like, and more particularly to a so-called cylinder type gas generator suitably incorporated in a side airbag device or the like.

  2. Description of the Related Art Conventionally, airbag devices, which are occupant protection devices, have been widely used from the viewpoint of protecting occupants such as automobiles. The airbag device is installed in a vehicle or the like for the purpose of protecting an occupant from an impact caused by the collision of the vehicle or the like, and the airbag is deployed by instantly inflating and deploying the airbag at the time of the vehicle or the like collision. It is a safety device that catches the occupant's body. The gas generator is a device that is incorporated in the airbag device and inflates and deploys the airbag by instantaneously generating gas when a vehicle or the like collides.

  There are various types of gas generators based on specifications such as installation position and output with respect to a vehicle or the like. One of them is a gas generator having a structure called “cylinder type”. The cylinder type gas generator has a long cylindrical shape, and is suitably incorporated in a side airbag device or the like. In a cylinder type gas generator, an igniter and a transfer charge are disposed at one end in the axial direction, a gas generating agent is disposed at a substantially central portion in the axial direction, and a filter and a gas outlet are disposed at the other end in the axial direction. Be placed.

  In this cylinder type gas generator, the flame generated by the operation of the igniter is transmitted to the gas generating agent through the combustion of the explosive charge, whereby the gas generating agent burns to generate high-temperature and high-pressure gas. . The generated high-temperature and high-pressure gas is ejected from the gas ejection port to the outside of the housing via the filter, and is used for inflation and deployment of the airbag.

In the cylinder type gas generator, it is necessary that the combustion chamber in which the gas generating agent is accommodated be hermetically sealed. This is because when the outside air enters the combustion chamber from an external space, the gas generating agent may absorb moisture due to moisture contained in the outside air that has entered, and the gas generating agent has absorbed moisture. This is because a desired gas output cannot be obtained. Therefore, in a conventional cylinder type gas generator, a seal portion is usually formed by interposing an O-ring between a holder for fixing an igniter and a housing fixed to the holder, and the seal portion Thus, the airtightness of the combustion chamber has been ensured. References disclosing a cylinder-type gas generator subjected to such a sealing process using an O-ring include, for example, Japanese Patent Application Laid-Open No. 11-78766 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2005-313812 (Patent Document). Reference 2).
Japanese Patent Laid-Open No. 11-78766 JP 2005-313812 A

  However, when the configuration as disclosed in Patent Documents 1 and 2 described above is employed, an O-ring for the sealing process is required separately, which complicates the assembly work and increases the cost due to the increase in the number of parts. Will occur. In order to prevent an increase in the number of parts, it is conceivable to join the holder and the housing by welding, but in this case as well, the work becomes complicated, resulting in an increase in manufacturing cost. As another method, it is conceivable to maintain the pressure contact state between the housing and the holder by press-fitting the holder into the housing or by crimping the housing toward the holder. It is difficult to ensure the required airtightness only by a simple sealing process.

  Therefore, the present invention has been made to solve the above-mentioned problems, and can be manufactured at low cost without increasing the number of parts, and airtightness between the housing and the holder can be easily secured. It is an object of the present invention to provide a gas generator that can be used.

  The gas generator based on this invention is provided with the housing, the holder, the igniter, and the resin molding part. The housing is formed of a long cylindrical metal member including a combustion chamber in which a gas generating agent is accommodated. The holder is attached to the housing in a state of being inserted into an opening end in the axial direction of the housing so as to face the combustion chamber, and has a hollow opening extending along a direction parallel to the axial direction of the housing. It consists of a metallic member. The igniter includes an igniter in which an igniting agent is accommodated, and is disposed in the hollow opening in a state where the igniter is located on the combustion chamber side. The resin molding part is formed by pouring an insulating fluid resin material into a space between the holder and the igniter and solidifying it, and is fixed to the surface of the holder and the surface of the igniter. By doing so, the igniter is fixed to the holder. The resin molding portion extends from a portion located between the holder and the igniter, and is fixed to the outer peripheral surface of the holder and is interposed between the housing and the holder so as to have a gap therebetween. It includes a seal part for sealing.

  By configuring in this way, the gap between the housing and the holder is filled by a part of the resin molding part for fixing the igniter to the holder, and the sealing process in the part is realized. It is possible to easily and hermetically seal the combustion chamber without increasing the number of parts. Therefore, it is possible to provide a gas generator that can be manufactured at low cost and that can easily ensure airtightness between the housing and the holder.

  In the gas generator according to the present invention, it is preferable that the holder is press-fitted into the opening end of the housing, and in that case, the seal portion is connected to the housing at a portion where the holder is press-fitted. It is desirable to interpose between the holders.

  With this configuration, the seal portion formed by extending a part of the resin molding portion is interposed between the housing and the holder at the portion where the holder is press-fitted into the housing, and has an appropriate surface. Since the compressed state where pressure is applied is maintained, a seal structure that exhibits good sealing characteristics can be realized by the portion. Therefore, the combustion chamber can be surely hermetically sealed, and a highly reliable gas generator can be obtained.

  In the gas generator according to the present invention, the holder is fixed to the housing by caulking the peripheral wall of the housing at a portion corresponding to the portion in which the holder is inserted, radially inward. In this case, it is preferable that the seal portion is interposed between the housing and the holder at a portion where the housing is caulked.

  With this configuration, the seal portion formed by extending a part of the resin molding portion is interposed between the housing and the holder at the portion where the housing is caulked toward the holder, and is appropriately Since the surface is maintained in a compressed state in which surface pressure is applied, a seal structure that exhibits good sealing characteristics can be realized by the portion. Therefore, the combustion chamber can be surely hermetically sealed, and a highly reliable gas generator can be obtained.

  In the gas generator according to the present invention, the holder preferably has an annular groove extending in the circumferential direction on the outer peripheral surface of the portion corresponding to the portion where the housing is caulked. It is desirable that a crimped portion of the housing is engaged with the annular groove.

  By configuring in this way, the seal portion is securely sandwiched and compressed by the housing and the holder when the housing is caulked, so that high airtightness can be realized.

  In the gas generator according to the present invention, a pressure contact portion in which the inner peripheral surface of the housing and the outer peripheral surface of the holder are in direct contact is provided at a portion of the housing where the holder is inserted. Is preferred.

  By configuring in this way, high pressure resistance is maintained at the part where the housing and the holder are in direct contact with each other. Therefore, highly reliable gas generation that does not cause gas leakage even during operation of the gas generator. Can be a container.

  In the gas generator according to the present invention, the pressure contact portion is formed by caulking the peripheral wall of the housing at a portion corresponding to the portion in which the holder is inserted, radially inward. It is preferable.

  By comprising in this way, it can be set as the gas generator from which a high pressure | voltage resistant characteristic is acquired reliably.

  In the gas generator according to the present invention, the resin molding portion is configured to prevent the ignition portion from being deformed toward the radially outer side of the housing during the operation of the igniter. It is preferable that the deformation | transformation suppression part formed by adhering to the said outer peripheral surface while being covered is included.

  By configuring in this way, the deformation suppressing unit comes to perform a reinforcing function of the peripheral wall of the igniter, so that it becomes possible to give directivity to the flame energy generated in the igniter during operation of the igniter, It becomes possible to collect the transmission direction of flame energy in the direction in which the gas generating agent is located. Therefore, the flame energy generated by operating the igniter can be efficiently transmitted to the gas generating agent, and a high-performance gas generator excellent in combustion efficiency can be obtained.

  In the gas generator based on the said invention, it is preferable that the said resin molding part has covered the surface of the said ignition part completely.

  By comprising in this way, since an ignition part will be completely covered with the resin molding part formed with an insulating resin material, as an igniter, the ignition part is covered only with metal cups. An igniter can be used. Conventionally, in order to prevent the occurrence of electrostatic discharge, it was necessary to use an igniter that covered the ignition part with a metal cup and further covered the outside with an insulating cup. By adopting the configuration, the resin molded portion replaces the insulating cup, so that the insulating cup becomes unnecessary and the number of parts can be reduced. Therefore, the gas generator can be manufactured at a low cost.

  In the gas generator based on the said invention, it is preferable that the wall surface located in the said opening end side among the wall surfaces which define the said combustion chamber is comprised only by the said resin molding part.

  With this configuration, the interface that should prevent communication between the combustion chamber and the external space on the opening end side of the housing is only the interface between the housing and the holder. When the above configuration is not adopted, an interface is generated between the resin molded portion and the igniter in addition to the above interface, and a sealing process is performed at the interface between the resin molded portion and the igniter. Strict management is required. Therefore, by adopting the above configuration, the number of interfaces to be sealed is reduced, and the sealing process of the combustion chamber with respect to the external space is further facilitated.

  In the gas generator according to the present invention, the resin molded portion may be formed by insert molding using a thermosetting resin as a raw material, or glass fiber is contained in the thermoplastic resin. It may be formed by insert molding using a raw material.

  By comprising in this way, since the resin molding part containing a seal part can be simply formed by insert molding, it becomes possible to manufacture a highly reliable gas generator at low cost.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as a gas generator which can be manufactured cheaply without increasing a number of parts, and can ensure airtightness between a housing and a holder easily.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments and modifications thereof, the same or corresponding parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
1A and 1B are diagrams showing an external structure of a cylinder type gas generator according to Embodiment 1 of the present invention. FIG. 1A is a front view and FIG. 1B is a right side view. Moreover, FIG. 2 is a figure which shows the internal structure of the cylinder type gas generator in this Embodiment, and is sectional drawing along the II-II line shown to FIG. 1 (A) and FIG. 1 (B). FIG. 3 is a cross-sectional view showing a detailed structure of the igniter assembly shown in FIG. First, referring to FIGS. 1A, 1B, 2 and 3, the external structure and internal structure of cylinder type gas generator 1A and the details of igniter assembly 20A in the present embodiment. A simple structure will be described.

  As shown in FIG. 1 (A), FIG. 1 (B), and FIG. 2, the cylinder type gas generator 1A in the present embodiment has a long and substantially cylindrical outer shape, and serves as an outer shell member. The housing 10, the closing member 12 and the holder 21 are included. The housing 10 is formed of a long cylindrical member having openings at both ends in the axial direction. The closing member 12 is made of a disk-shaped member having a predetermined thickness, and has an annular groove portion 13 for fixing by caulking, which will be described later, on the peripheral surface thereof. The annular groove 13 for fixing by caulking is formed on the circumferential surface of the closing member 12 so as to extend along the circumferential direction. The holder 21 is formed of a cylindrical member having a hollow opening 22 extending along the same direction as the axial direction of the housing 10, and has an annular groove portion 24 for fixing by caulking, which will be described later, at a predetermined position on the outer peripheral surface thereof. Yes. The annular groove 24 for fixing by caulking is formed on the outer peripheral surface of the holder 21 so as to extend along the circumferential direction.

  The closing member 12 is attached to the housing 10 so as to close one open end of the housing 10. On the other hand, the holder 21 is attached to the other open end of the housing 10. A partition member 14 made of a disk-like plate material is disposed at a predetermined position in the axial direction of the housing 10. The partition member 14 divides the space inside the housing 10 into a combustion chamber 17 and a filter chamber 18 in the axial direction.

  The housing 10, the closing member 12, the partition member 14, and the holder 21 are all made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. The housing 10, the closing member 12, the partition member 14 and the holder 21 are connected and fixed by caulking. Specifically, a part of the peripheral wall of the housing 10 corresponding to the annular groove portion 13 provided on the peripheral surface of the closing member 12 in a state in which a part of the closing member 12 is inserted into one opening end of the housing 10. The closing member 12 is caulked and fixed to the housing 10 by reducing the diameter inward in the radial direction (caulking) and engaging with the annular groove 13. One end of the holder 21 is fixed to the other opening end of the housing 10. In a state in which the portion is inserted, the peripheral wall of the housing 10 corresponding to the annular groove portion 24 provided on the outer peripheral surface of the holder 21 is contracted (crimped) radially inward to engage with the annular groove portion 24. By doing so, the holder 21 is caulked and fixed to the housing 10. Further, the partition member 14 inserted in a predetermined position of the housing 10 is formed by reducing the diameter of the peripheral walls of both side portions of the housing 10 corresponding to the portion where the partition member 14 is located inward in the radial direction ( The peripheral edge is sandwiched in the axial direction of the housing 10 by a pair of caulking portions formed (by caulking), thereby being fixed to the housing 10 by caulking.

  These caulking fixings are caulking fixings called eight-side caulking that uniformly reduce the diameter of the peripheral wall of the housing 10 inward in the radial direction. By performing this caulking, the first to third caulking portions 10 </ b> A to 10 </ b> C are provided on the peripheral wall of the housing 10. Among these caulking portions, the first caulking portion 10A is a caulking portion for fixing the closing member 12 to the housing 10, and the second caulking portion 10B is a pair of caulking portions for fixing the partition member 14 to the housing 10. The third caulking portion 10 </ b> C is a caulking portion for fixing the holder 21 to the housing 10.

  As shown in FIGS. 1A and 2, a gas outlet 11 is provided on the peripheral wall near the end of the housing 10 on the side where the closing member 12 is attached. The gas ejection ports 11 are holes for ejecting the gas generated inside the cylinder type gas generator 1 </ b> A to the outside, and a plurality of gas ejection ports 11 are provided along the circumferential direction and the axial direction of the housing 10.

  As shown in FIG. 2, an igniter (squib) 30 is disposed in the hollow opening 22 of the holder 21, and the resin molding part 40 is located between the holder 21 and the igniter 30. Yes. The resin molding part 40 is a part formed to fix the igniter 30 to the holder 21. As shown in FIGS. 2 and 3, the holder 21, the igniter 30 and the resin molding portion 40 constitute an igniter assembly 20 </ b> A as an intermediate assembly part. The holder 21 is fixed to the housing 10 in the state of an igniter assembly 20 </ b> A in which the igniter 30 is fixed to the holder 21 by the resin molding portion 40.

  As shown in FIG. 3, the igniter 30 is an ignition device for generating a flame, and includes an ignition unit 31 and a terminal pin 35. The ignition unit 31 is accommodated in a metal cup 32, a plastic cup 33 that covers the outside of the metal cup 32, an igniting agent 34 that is accommodated in the metal cup 32, and the metal cup 32. And a resistor (generally a bridge wire) not shown. The ignition agent 34 is ignited when the igniter 30 is operated. A resistor (not shown) is a part for burning the ignition powder 34. The terminal pin 35 is connected to the resistor for igniting the igniting agent 34.

  More specifically, the igniter 30 includes a base frame through which the pair of terminal pins 35 are inserted and held, and a squib cup made up of a metal cup 32 and a plastic cup 33 mounted on the base frame. A resistor is attached so as to connect the tip of the terminal pin 35 inserted into the squib cup, and the squib cup is filled with an igniting agent 34 so as to surround or be in contact with the resistor. Yes. Nichrome wire or the like is generally used as the resistor, and ZPP (zirconium / potassium perchlorate), ZWPP (zirconium / tungsten / potassium perchlorate), lead tricinate, or the like is generally used as the igniter 34.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 35. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the igniting agent 34 starts to burn upon receiving this heat. The high-temperature flame generated by the combustion ruptures the squib cup containing the igniting agent 34. The time from when the current flows through the resistor until the igniter 30 is activated is generally 2 milliseconds or less when a nichrome wire is used as the resistor.

  With reference to FIG. 3, the holder 21 has the hollow opening part 22 extended in an axial direction as mentioned above. The inner peripheral surface that defines the hollow opening 22 of the holder 21 is formed in a curved shape so that the inner diameter of the hollow opening 22 changes smoothly in the axial direction. The igniter 30 is arranged in a state where a part thereof is accommodated in the hollow opening 22. More specifically, the portion of the igniter 30 where the terminal pin 35 is located and the portion of the igniter 31 on the side where the terminal pin 35 is provided are disposed in the hollow opening 22, and the terminal pin 35 of the igniter 31 is provided. The portion on the side that is not provided is arranged so as to protrude outward from the axial end surface 21 a of the holder 21.

  As described above, the igniter 30 is fixed to the holder 21 by the resin molding portion 40. As shown in FIG. 3, the resin molding part 40 includes a fixing part 41, a deformation suppressing part 42, and a seal part 43. These three parts are formed at the same time in the same process at the time of injection molding to be described later, but the functions exhibited by these three parts are different based on the formation positions as shown below. It has become.

  The fixing portion 41 is provided so as to fill a space between the igniter 30 disposed in the hollow opening 22 of the holder 21 and the holder 21. The fixing portion 41 is fixed to the inner peripheral surface of the holder 21 and the surface of the portion of the igniter 30 located in the hollow opening 22, and is a portion for fixing the igniter 30 to the holder 21. A recessed portion 41a is provided in the fixed portion 41 where the terminal pin 35 of the igniter 30 is located, so that the tip portion of the terminal pin 35 is exposed. The recess 41a is a part to which a female connector (not shown) to which a male connector of a harness that transmits a signal from the collision detection means is connected to the cylinder type gas generator 1A is attached.

  The deformation suppressing part 42 extends from the fixing part 41 and is provided so as to cover the axial end face 21a of the holder 21 on the side where a part of the ignition part 31 protrudes. The deformation suppressing portion 42 is fixed to the axial end surface 21 a of the holder 21 and the outer peripheral surface of the portion of the ignition portion 31 that protrudes from the holder 21 and is generated in the igniter 30 when the igniter 30 is operated. It is a part that functions as a reinforcing material for imparting directivity to the flame energy.

  The seal portion 43 is provided so as to extend from the deformation suppressing portion 42 and cover a part of the outer peripheral surface 23 of the holder 21. The seal portion 43 is fixed to the outer peripheral surface 23 of the holder 21 near the axial end surface 21a, and is a portion for performing a seal process described later. In the igniter assembly 20 </ b> A in the present embodiment, the seal portion 43 is not provided in the annular groove portion 24.

  The resin molding part 40 is formed by pouring an insulating fluid resin material into the space between the holder 21 and the igniter 30 and solidifying it. That is, the resin molding part 40 is formed by injection molding (more specifically, insert molding). As a raw material of the resin molding part 40 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, it is not limited to a thermosetting resin typified by an epoxy resin or the like, but is typified by a polybutylene terephthalate resin, a polyethylene terephthalate resin, a polyamide resin (for example, nylon 6 or nylon 66), a polypropylene sulfide resin, or a polypropylene oxide resin. It is also possible to use a thermoplastic 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 40 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.

  As shown in FIG. 2, the combustion chamber 17 and the filter chamber 18 described above are provided in the space inside the cylinder type gas generator 1 </ b> A defined by the housing 10, the closing member 12 and the holder 21. The filter chamber 18 is mainly defined by the housing 10, the closing member 12, and the partition member 14, and is provided at a portion near the opening end of the housing 10 (the left portion in the drawing). On the other hand, the combustion chamber 17 is mainly defined by the housing 10, the partition member 14, and the igniter assembly 20 </ b> A, and is provided in a portion near the other opening end of the housing 10 (right portion in the drawing).

  Inside the combustion chamber 17, a cup-shaped member 50, a cushion material 61, a gas generating agent 62 and a porous plate 19 are mainly disposed. On the other hand, a filter 63 is disposed inside the filter chamber 18.

  The cup-shaped member 50 includes a bottomed cylindrical cup portion 51 and a lid portion 52 that closes the cup portion 51, and is disposed at the end of the combustion chamber 17 on the side where the igniter assembly 20A is located. ing. An explosive charge (enhancer) 53 is accommodated in the explosive charge accommodating chamber 51 a which is the space inside the cup-shaped member 50. The cup-shaped member 50 is bonded and fixed to the surface on the combustion chamber 17 side of the igniter assembly 20A as necessary.

The explosive charge 53 is ignited by a flame generated by the operation of the igniter 30 and burns to generate hot particles. The charge transfer agent 53 must be capable of reliably starting the combustion of the gas generating agent 62, and is generally composed of a metal powder / oxidant typified by B / KNO ₃ or the like. Things are used. As the explosive charge 53, a powdery one, a one molded into a predetermined shape by a binder, or the like is used. Examples of the shape of the transfer charge molded by the binder include various shapes such as a granular shape, a columnar shape, a sheet shape, a spherical shape, a single-hole cylindrical shape, a porous cylindrical shape, and a tablet shape.

  The gas generating agent 62 is ignited by the heat particles generated by the combustion of the charge transfer agent 53 ignited by the igniter 30, and generates gas by burning. The gas generating agent 62 is generally formed as a molded body containing a fuel, an oxidant, and an additive. As the fuel, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used. In addition, as the oxidizing agent, for example, nitrate containing a cation selected from alkali metals, alkaline earth metals, transition metals, and ammonia is used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used. In addition, examples of the additive include a binder, a slag forming agent, and a combustion adjusting agent. As the binder, for example, organic binders such as metal salts of carboxymethyl cellulose and stearates, and inorganic binders such as synthetic hydroxytalcite and acid clay can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Moreover, as a combustion regulator, a metal oxide, ferrosilicon, activated carbon, graphite, etc. can be used suitably.

  The shape of the molded body of the gas generating agent 62 includes various shapes such as granules, pellets, columns, and disks. In addition, a porous (for example, a single-hole cylindrical shape or a porous cylindrical shape) having a hole inside the molded body is also used. These shapes are preferably selected as appropriate according to the specifications of the airbag apparatus in which the cylinder type gas generator 1A is incorporated. For example, the shape in which the gas generation rate changes with time when the gas generating agent 62 is burned. It is preferable to select an optimal shape according to the specification, such as selecting. In addition to the shape of the gas generating agent 62, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear combustion rate, the pressure index, etc. of the gas generating agent 62.

  The cushion material 61 is disposed so as to contact the bottom of the cup portion 51 of the cup-shaped member 50 and to contact the gas generating agent 62 accommodated in the combustion chamber 17. The cushion material 61 is provided for the purpose of preventing the gas generating agent 62 made of a molded body from being pulverized by vibration or the like, and a ceramic fiber molded body or foamed silicon is preferably used. The cushion material 61 is opened or divided by burning of the transfer charge 53 during the operation of the cylinder type gas generator 1A, and may be burned out in some cases.

  A perforated plate 19 provided with a plurality of communication holes 19a is disposed at the end of the combustion chamber 17 on the partition member 14 side. The porous plate 19 rectifies the flow of gas released from the combustion chamber 17 during operation, and prevents the gas generating agent 62 accommodated in the combustion chamber 17 from moving to the filter chamber 18 in an unburned state. Is for. Therefore, all the communication holes 19 a provided in the porous plate 19 are formed smaller than the outer shape of the gas generating agent 62, and are formed smaller than the communication holes 14 a described later provided in the partition member 14.

  A communication hole 14 a that communicates between the combustion chamber 17 and the filter chamber 18 during operation is provided at the center of the partition member 14 that partitions the combustion chamber 17 and the filter chamber 18. A seal member 14b is attached to the main surface of the partition member 14 located on the combustion chamber 17 side so as to close the communication hole 14a. As the seal member 14b, an aluminum foil or the like having an adhesive member applied on one side is used. As a result, airtightness between the combustion chamber 17 and the filter chamber 18 during non-operation is ensured, and mixing of moisture and the like into the combustion chamber 17 is prevented.

  A filter 63 is accommodated in the filter chamber 18. The filter chamber 18 communicates with the outside through the gas outlet 11 provided on the peripheral wall of the housing 10 described above.

  The filter 63 is made of a cylindrical member having a hollow portion 63 a extending in the same direction as the axial direction of the housing 10. If the filter 63 made of a cylindrical member is used in this way, the flow resistance of the working gas flowing through the filter chamber 18 during operation can be kept low, and an efficient gas flow can be realized. As the filter 63, for example, a wire made of a metal such as stainless steel or steel, a wire wound around a net, 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. When the gas generated in the combustion chamber 17 passes through the filter 63, the filter 63 functions as a cooling unit that cools the gas by taking away the high-temperature heat of the gas, and a residue contained in the gas. It also functions as a removing means for removing (slag) and the like.

  Note that, as described above, a female connector (not shown) is attached to the recess 41a provided in the fixed portion 41 of the resin molding portion 40 of the igniter assembly 20A. A shorting clip (not shown) is attached to the female connector as necessary. The shorting clip is attached to prevent the cylinder type gas generator 1A from malfunctioning due to electrostatic discharge or the like during the transportation of the cylinder type gas generator 1A. When the male connector of the harness is inserted into the female connector in the stage, the contact with the terminal pin 35 is released.

  Next, the operation | movement at the time of the action | operation of the cylinder type gas generator 1A demonstrated above is demonstrated. When a vehicle equipped with an airbag device incorporating the cylinder type gas generator 1A in the present embodiment collides, the collision is detected by a collision detection means provided separately in the vehicle, and ignition is performed based on this. The device 30 is activated. When the igniter 30 is activated, the pressure in the igniter 31 is increased by the combustion of the igniting agent 34, whereby the igniter 31 is ruptured and the flame flows out of the igniter 31. The explosive charge 53 accommodated in the explosive charge accommodating chamber 51a is ignited and burned by the flame generated by the operation of the igniter 30, and generates a large amount of heat particles. Due to the combustion of the charge transfer agent 53, the pressure in the transfer charge storage chamber 51 a is increased, whereby the cup-shaped member 50 is ruptured, and the above-described heat particles reach the cushion material 61. The hot particles that have reached the cushion material 61 burn the cushion material 61 to open or divide it, whereby the hot particles reach the gas generating agent 62.

  Due to the flowing heat particles, the gas generating agent 62 is ignited and burned to generate a large amount of gas. The combustion of the gas generating agent 62 increases the pressure in the combustion chamber 17, thereby releasing the sealing of the communication hole 14 a by the seal member 14 b, and the generated gas flows into the filter chamber 18. The gas that has flowed flows through the hollow portion 63a of the filter 63, is then cooled to a predetermined temperature via the filter 63, and is ejected from the gas ejection port 11 to the outside of the cylinder type gas generator 1A. . The gas ejected from the gas ejection port 11 is guided into the airbag to inflate and deploy the airbag.

  In the cylinder type gas generator 1A according to the present embodiment, since the deformation suppression unit 42 is provided so as to surround the peripheral wall of the ignition unit 31 of the igniter 30, the deformation suppression unit 42 includes the ignition unit 31. It plays the role which reinforces a surrounding wall and it is suppressed effectively that the ignition part 31 deform | transforms toward the radial direction outer side of the housing 10 at the time of an action | operation. Therefore, when the igniter 30 is in operation, the igniter 31 is ruptured mainly in the axial direction of the housing 10, and the flame energy generated in the igniter 30 is diffused with directivity toward the combustion chamber 17 side. The directivity of the flame energy greatly affects the diffusion direction of the hot particles due to the combustion of the charge transfer 53 even when the transfer charge 53 is burned, and the heat particles are efficiently diffused toward the gas generating agent 62. . Therefore, it is possible to efficiently transmit the flame energy generated in the igniter 30 to the gas generating agent 62, and it is difficult for loss to occur in the flame energy, and the transmission can be performed more quickly.

  4 is an enlarged cross-sectional view of region IV shown in FIG. Next, with reference to this FIG. 4, the detail of the sealing structure between the housing 10 and the holder 21 in the cylinder type gas generator 1A in this Embodiment is demonstrated.

  As shown in FIG. 4, in the cylinder type gas generator 1 </ b> A in the present embodiment, the igniter assembly 20 </ b> A including the holder 21 is attached in a state of being inserted into the opening end of the housing 10. Therefore, the seal portion 43 of the resin molded portion 40 is interposed between the inner peripheral surface 10g of the housing 10 and the portion of the outer peripheral surface 23 of the holder 21 near the end surface, and the housing 10 and the holder 21 The gap between them is filled. Since the seal portion 43 is formed in a cylindrical shape so as to surround the outer peripheral surface 23 of the holder 21 by the above-described injection molding, the gap between the housing 10 and the holder 21 is filled over the entire circumference in the circumferential direction. is doing.

  A region where the seal portion 43 is located corresponds to a press-fitting region P in which the igniter assembly 20 </ b> A is press-fitted into the housing 10. In the press-fitting region P, the igniter assembly 20A is attached to the housing 10 by press-fitting the igniter assembly 20A into the housing 10, and in this press-fitting region P, between the housing 10 and the holder 21 Since the seal portion 43 is interposed between the seal portion 43 and the seal portion 43, an appropriate surface pressure is applied. That is, the seal portion 43 made of a resin member is appropriately compressed by the surface pressure, and the compression fills the space between these members, that is, between the housing 10 and the holder 21, so that no gap is generated. Sex comes to be demonstrated.

  On the other hand, a caulking fixing region Q is located in a portion closer to the opening end of the housing 10 where the igniter assembly 20A is inserted than the press-fitting region P described above. In the caulking fixing region Q, a force is applied to the peripheral wall of the housing 10 in the direction of arrow A in the figure, so that the peripheral wall of the housing 10 is pressed against the annular groove portion 24 provided on the outer peripheral surface 23 of the holder 21. As a result, the peripheral wall of the housing 10 is reduced in diameter (caulked) along the outer peripheral surface 23 of the holder 21 to be plastically deformed, and the caulking portion 10C including the reduced diameter portions 10a to 10c is engaged with the annular groove portion 24. Configured to match. Thereby, combined with the press-fitting in the above-described press-fitting region P, the igniter assembly 20 </ b> A is securely fixed to the housing 10. Here, each of the reduced diameter portions 10a to 10c is in direct contact with the outer peripheral surface 23 of the holder 21, thereby ensuring a pressure resistance during operation (that is, preventing gas leakage). .

  By using the cylinder type gas generator 1A in the present embodiment described above, a gap between the housing 10 and the holder 21 is formed by the seal portion 43 formed by extending a part of the resin molded portion 40. Will be filled, and the sealing process in the said part will be implement | achieved. Therefore, the combustion chamber 17 can be easily and airtightly sealed without increasing the number of parts, and it is possible to prevent the outside air containing moisture from entering the combustion chamber 17 and absorbing the gas generating agent 62. It becomes. Therefore, a highly reliable cylinder type gas generator that can be manufactured easily and at low cost can be obtained.

  In the cylinder type gas generator 1A in the present embodiment, the sealing portion 43 is sandwiched between the housing 10 and the holder 21 and compressed to ensure sealing performance. Therefore, the thickness before assembly of the seal portion 43 is preferably adjusted to about 0.02 mm to 2.0 mm, although it varies somewhat depending on the specific material, and the compression after the assembly is performed. The rate is preferably set to 8% or more and 40% or less. When the thickness before assembling of the seal portion 43 and the compression rate after assembling satisfy the above conditions, the sealing performance at the portion is stably maintained over a long period of time.

  5 to 8 are enlarged sectional views showing modifications of the cylinder type gas generator in the present embodiment. Next, cylinder type gas generators 1B to 1E according to first to fourth modifications of the present embodiment will be described with reference to these drawings.

  In the cylinder type gas generators 1B to 1D according to the first to third modifications shown in FIGS. 5 to 7, a seal portion 43 extending from the fixing portion 41 of the resin molding portion 40 via the deformation suppressing portion 42. However, it not only reaches the press-fitting region P but also reaches the caulking fixing region Q located further on the end side.

  More specifically, in the cylinder type gas generator 1B according to the first modification shown in FIG. 5, the portion where the reduced diameter portion 10a of the caulking fixing region Q is located where the seal portion 43 is adjacent to the press-fitting region P (that is, , And the reduced diameter portion 10a and the reduced diameter portion 10a are located between the housing 10 and the igniter assembly 20B. The seal portion 43 is sandwiched between the annular groove portion 24 corresponding to the portion.

  Further, in the cylinder-type gas generator 1C according to the second modification shown in FIG. 6, the portion where the reduced diameter portion 10b adjacent to the reduced diameter portion 10a of the caulking fixing region Q is positioned (that is, the housing) 10 and the portion corresponding to the portion where the reduced diameter portions 10a and 10b and the reduced diameter portions 10a and 10b are located between the housing 10 and the igniter assembly 20C. The seal portion 43 is sandwiched by the annular groove portion 24.

  Further, in the cylinder type gas generator 1D according to the third modification shown in FIG. 7, the seal portion 43 is a portion where the reduced diameter portion 10c adjacent to the reduced diameter portion 10b of the caulking fixed region Q is located (that is, the housing). 10 and the reduced diameter portions 10a to 10c and the reduced diameter portions 10a to 10c are located between the housing 10 and the igniter assembly 20D. The seal portion 43 is sandwiched between the annular groove portion 24 corresponding to the portion to be engaged.

  When the configurations shown in FIGS. 5 to 7 are employed, when the caulking process is performed in the caulking fixing region Q, the surface pressure is surely applied to the seal portion 43 interposed between the housing 10 and the holder 21. Therefore, not only the press-fitting region P but also the caulking and fixing region Q is secured. Therefore, it becomes possible to obtain better sealing characteristics.

  In the cylinder type gas generator 1E according to the fourth modified example shown in FIG. 8, in addition to the annular groove portion 24 for caulking and fixing the holder 21 provided in the cylinder type gas generator 1A in the present embodiment described above. Further, an annular groove portion 25 is provided on the outer peripheral surface 23 of the holder 21 on the combustion chamber 17 side of the portion where the annular groove portion 24 is provided, and a caulking portion 10D is provided on the peripheral wall of the housing 10 corresponding to the annular groove portion 25. It has a configuration. That is, in the area where the housing 10 and the igniter assembly 20E inserted in the housing 10 face each other, the caulking area R is provided in addition to the press-fitting area P and the caulking fixing area Q. In the caulking region R, by applying a force to the peripheral wall of the housing 10 in the direction of arrow B in the figure, the peripheral wall of the housing 10 is pressed toward the annular groove 25 provided on the outer peripheral surface 23 of the holder 21. Thus, the peripheral wall of the housing 10 is reduced in diameter (caulked) along the outer peripheral surface 23 of the holder 21 to be plastically deformed, and the caulking portion 10D including the reduced diameter portions 10d to 10f is engaged with the annular groove portion 25. Is configured to do. In the caulking region R, the seal portion 43 is located between the housing 10 and the annular groove portion 25, and the sealing performance is secured by this portion.

  In such a configuration, when the caulking process is performed in the caulking region R, the surface pressure surely acts on the seal portion 43 interposed between the housing 10 and the holder 21. Not only P but also the caulking region R is secured. Further, since the housing 10 and the igniter assembly 20E are fixed by the caulking fixing region Q provided separately from the caulking region R, more reliable fixing can be realized. Therefore, it is possible to provide a cylinder type gas generator that can obtain good sealing characteristics and can be reliably assembled.

  In the fourth modification shown in FIG. 8, the case where the holder 21 is provided with the annular groove 25 in the caulking region R is illustrated, but such an annular groove 25 is not necessarily required. For example, in the configuration shown in FIG. 4, the housing 10 is not provided with the annular groove portion 25, and after the press-fitting of the igniter assembly 20 </ b> A with respect to the housing 10, the housing is simply moved in the press-fitting region P toward the arrow B direction indicated by the dotted line in the drawing. It is good also as caulking 10. When configured in this manner, the surface pressure is surely applied to the seal portion 43 interposed between the housing 10 and the holder 21, so that the sealing performance at the portion can be further ensured. In addition, a good sealing property can be obtained without providing the annular groove 25 separately.

(Embodiment 2)
FIG. 9 is a cross-sectional view of an igniter assembly incorporated in a cylinder type gas generator in Embodiment 2 of the present invention. FIG. 10 is an enlarged cross-sectional view showing the internal structure of the cylinder type gas generator according to Embodiment 2 of the present invention. In the following, referring to FIG. 9 and FIG. 10, the structure of the cylinder type gas generator 1F in the present embodiment and the structure of the igniter assembly 20F assembled to the cylinder type gas generator 1F will be described in detail. explain.

  As shown in FIG. 9, the igniter assembly 20F of the cylinder-type gas generator 1F in the present embodiment is different from the igniter assembly 20A of the cylinder-type gas generator 1A in the first embodiment described above, and is resin-molded. The part 40 includes a covering part 44 in addition to the fixing part 41, the deformation suppressing part 42 and the seal part 43. The covering portion 44 extends from the deformation suppressing portion 42 and covers the top surface (that is, the bottom surface of the squib cup of the igniter 31) located on the combustion chamber 17 side of the igniter 30 of the igniter 30. Thereby, in the igniter assembly 20F, the ignition part 31 is completely covered with the resin molding part 40. The covering portion 44 needs to have a thickness that can be broken when the igniter 30 is operated, and the thickness is preferably about 0.1 mm to 2.0 mm.

  As shown in FIG. 10, in the cylinder type gas generator 1 </ b> F in the present embodiment, the above-described igniter assembly 20 </ b> F is fixed in a state of being inserted into the housing 10. Therefore, since the ignition part 31 of the igniter 30 is completely covered by the resin molding part 40 formed of an insulating resin material, as the igniter 30, the ignition part 31 is covered only by the metal cup 32. It is possible to use an igniter. Conventionally, in order to prevent the occurrence of electrostatic discharge, it has been necessary to use an igniter whose igniter is covered with a metal cup and whose outside is covered with an insulating cup. In the cylinder type gas generator 1F according to the embodiment, the deformation suppressing portion 42 and the covering portion 44 of the resin molded portion 40 replace the insulating cup, so that the number of parts can be reduced. Therefore, the gas generator can be manufactured at a low cost.

  Further, when the above-described configuration is adopted, the wall surface defining the combustion chamber 17 is located on the opening end side of the housing 10 where the igniter assembly 20F is attached. Will only be configured. With this configuration, the interface that should prevent communication between the combustion chamber 17 and the external space on the opening end side of the housing 10 is between the inner peripheral surface 10 g of the housing 10 and the outer peripheral surface 23 of the holder 21. It becomes only the interface. When the above configuration is not employed, an interface is generated between the resin molded portion 40 and the igniter 30 in addition to the above interface, and a seal at the interface between the resin molded portion 40 and the igniter 30 is generated. It is necessary to strictly manage the processing. Therefore, by adopting the configuration like the cylinder type gas generator 1F in the present embodiment, the number of interfaces to be sealed is reduced, and the sealing process of the combustion chamber 17 to the external space is easier. Will be able to.

(Embodiment 3)
FIG. 11 is an enlarged cross-sectional view showing the internal structure of the cylinder type gas generator according to Embodiment 3 of the present invention. Below, with reference to this FIG. 11, the seal structure of the cylinder type gas generator 1G in this Embodiment is demonstrated in detail.

  As shown in FIG. 11, the cylinder type gas generator 1G in the present embodiment does not include the press-fitting region P, unlike the cylinder type gas generator 1A in the first embodiment. That is, the igniter assembly 20 </ b> G including the holder 21 is inserted into the opening end of the housing 10, and the peripheral wall of the housing 10 is contracted toward the annular groove portion 24 provided on the outer peripheral surface 23 of the holder 21 in the caulking fixing region Q. It is fixed only by making it caulked. Of the portion where the inner peripheral surface 10g of the housing 10 and the outer peripheral surface 23 of the holder 21 face each other, the surface pressure is not applied to the seal portion 43 in the portion located on the combustion chamber 17 side of the caulking fixing region Q. In addition, the sealability is not ensured in this part. However, the seal portion 43 reaches the portion where the reduced diameter portion 10a of the caulking fixing region Q is located (that is, the inclined portion located on the combustion chamber 17 side of the caulking portion 10C of the housing 10), and the reduced diameter portion 10a. The seal portion 43 is sandwiched between the annular groove portion 24 corresponding to the portion where the reduced diameter portion 10a is located.

  Even in such a configuration, when the caulking process is performed in the caulking fixing region Q, the surface pressure acts on the seal portion 43 interposed between the housing 10 and the holder 21 with certainty. Even if the press-fitting region P provided in the first embodiment is not provided, good sealing performance is secured in the caulking fixing region Q.

(Embodiment 4)
FIG. 12 is an enlarged cross-sectional view showing the internal structure of the cylinder type gas generator according to Embodiment 4 of the present invention. Below, with reference to this FIG. 12, the seal structure of the cylinder type gas generator 1H in this Embodiment is demonstrated in detail.

  As shown in FIG. 12, the cylinder type gas generator 1H in the present embodiment includes a press-fitting region P and a caulking fixing region Q, similarly to the cylinder type gas generator 1A in the first embodiment. In addition, the cylinder type gas generator 1H in the present embodiment further includes a pressure contact region S. The pressure contact region S is positioned closer to the opening end of the housing 10 than the caulking fixing region Q (opening end on the side where the igniter assembly 20H including the holder 21 is inserted). A groove or the like is not particularly formed on the outer peripheral surface 23 of the holder 21 corresponding to the pressure contact region S. In the pressure contact region S, the inner peripheral surface 10g of the housing 10 and the outer peripheral surface 23 of the holder 21 are in direct contact with each other by caulking the housing 10 in the direction of arrow C in the drawing to form the caulking portion 10E. The pressure contact state between 10E and the holder 21 is maintained. The seal portion 43 is interposed between the housing 10 and the holder 21 in the press-fitting region P and the caulking fixing region Q, and is not interposed between them in the press-contact region S.

  With this configuration, in addition to the effects described in the first embodiment of the present invention, high pressure resistance is maintained in the pressure contact region S where the housing 10 and the holder 21 are in direct contact with each other. It is possible to provide a highly reliable cylinder type gas generator that does not cause gas leakage even at times. In the above description, the case where the press contact area S is formed by caulking the housing 10 is illustrated, but the press contact area S can be formed by press fitting or the like.

  In the cylinder type gas generators 1A to 1H according to the first to fourth embodiments of the present invention described above and the modifications thereof, the case where the resin molding portion 40 includes the deformation suppressing portion 42 is exemplified. Explanation was given. However, the deformation suppressing unit 42 is an additional configuration to the last, and is not necessarily an essential configuration. That is, a thin layer that does not function as a deformation suppressing portion may be formed on the axial end surface 21a of the holder 21 so as to connect the fixing portion 41 and the seal portion 43. It is good also as a structure which connects the fixing | fixed part 41 and the seal | sticker part 43 via the axial direction end surface on the opposite side to the said axial direction end surface 21a.

  In the cylinder type gas generators 1A to 1H according to the first to fourth embodiments of the present invention and the modifications thereof described above, the transfer charge 53 is sealed by the cup-shaped member 50 so that the inside of the combustion chamber 17 is filled. The description has been given by exemplifying the case where the igniter assemblies 20A to 20H are arranged in a portion adjacent to the igniter assemblies 20A to 20H. However, the transfer charge 53 is not necessarily sealed by the cup-shaped member 50, and the transfer charge 53 is directly placed in the space defined by the igniter assemblies 20 </ b> A to 20 </ b> H and the cushion material 61 in the combustion chamber 17. It is good also as a structure filled up.

  Further, the characteristic configurations of the cylinder type gas generators 1A to 1H according to the first to fourth embodiments of the present invention and the modifications thereof can be combined with each other.

  As described above, the above-described embodiment and its modifications disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope equivalent to the description of the claims.

It is a figure which shows the external appearance structure of the cylinder type gas generator in Embodiment 1 of this invention, (A) is a front view, (B) is a right view. It is a figure which shows the internal structure of the cylinder type gas generator in Embodiment 1 of this invention, and is sectional drawing along the II-II line shown to FIG. 1 (A) and FIG. 1 (B). It is sectional drawing of the igniter assembly of the cylinder type gas generator in Embodiment 1 of this invention. It is an expanded sectional view of the area | region IV shown in FIG. It is an expanded sectional view which shows the internal structure of the cylinder type gas generator which concerns on the 1st modification of Embodiment 1 of this invention. It is an expanded sectional view which shows the internal structure of the cylinder type gas generator which concerns on the 2nd modification of Embodiment 1 of this invention. It is an expanded sectional view which shows the internal structure of the cylinder type gas generator which concerns on the 3rd modification of Embodiment 1 of this invention. It is an expanded sectional view which shows the internal structure of the cylinder type gas generator which concerns on the 4th modification of Embodiment 1 of this invention. It is sectional drawing of the igniter assembly of the cylinder type gas generator in Embodiment 2 of this invention. It is an expanded sectional view which shows the internal structure of the cylinder type gas generator in Embodiment 2 of this invention. It is an expanded sectional view which shows the internal structure of the cylinder type gas generator in Embodiment 3 of this invention. It is an expanded sectional view which shows the internal structure of the cylinder type gas generator in Embodiment 4 of this invention.

Explanation of symbols

  1A to 1H Cylinder type gas generator, 10 housing, 10a to 10f reduced diameter portion, 10g inner peripheral surface, 10A to 10E caulking portion, 11 gas outlet, 12 closing member, 13 annular groove, 14 partition member, 14a communication hole , 14b Seal member, 17 Combustion chamber, 18 Filter chamber, 19 Perforated plate, 19a Communication hole, 20A-20H Igniter assembly, 21 Holder, 21a Axial end surface, 22 Hollow opening, 23 Outer peripheral surface, 24, 25 Annular Groove part, 30 igniter, 31 ignition part, 32 metal cup, 33 plastic cup, 34 igniting agent, 35 terminal pin, 40 resin molding part, 41 fixing part, 41a concave part, 42 deformation suppressing part, 43 seal part, 44 Covering part, 50 cup-shaped member, 51 cup part, 51a charge transfer chamber, 52 lid, 53 charge transfer charge, 61 Cushion material, 62 gas generating agent, 63 filter, 63a hollow section, P pressed area, Q caulked region, R caulking region, S pressed region.

Claims (11)

A long cylindrical metal housing containing therein a combustion chamber containing a gas generating agent;
It is attached to the housing in a state of being inserted in the opening end in the axial direction of the housing so as to face the combustion chamber, and is made of metal including a hollow opening extending along a direction parallel to the axial direction of the housing A holder,
An igniter including an igniter in which an igniting agent is accommodated, the igniter being disposed in the hollow opening with the igniter positioned on the combustion chamber side;
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. And a resin molding part for fixing to the holder,
The resin molding portion extends from a portion located between the holder and the igniter, and is fixed to the outer peripheral surface of the holder and is interposed between the housing and the holder so as to have a gap therebetween. A gas generator including a seal part for sealing. The holder is press-fitted into the open end of the housing;
The gas generator according to claim 1, wherein the seal portion is interposed between the housing and the holder at a portion where the holder is press-fitted. The holder is fixed to the housing by caulking the peripheral wall of the housing at a portion corresponding to a portion where the holder is inserted, radially inward,
The gas generator according to claim 1, wherein the seal portion is interposed between the housing and the holder at a portion where the housing is caulked. The holder has an annular groove extending in a circumferential direction on an outer peripheral surface of a portion corresponding to a portion where the housing is caulked,
The gas generator according to claim 3, wherein a crimped portion of the housing is engaged with the annular groove.   The gas according to any one of claims 1 to 4, wherein a pressure contact portion in which an inner peripheral surface of the housing and an outer peripheral surface of the holder are in direct contact with each other is provided at a portion of the housing where the holder is inserted. Generator.   The gas generator according to claim 5, wherein the press contact portion is formed by caulking a peripheral wall of the housing at a portion corresponding to a portion where the holder is inserted toward a radially inner side.   The resin molded portion covers the outer peripheral surface of the ignition portion and adheres to the outer peripheral surface in order to prevent the ignition portion from being deformed toward the radially outer side of the housing during operation of the igniter. The gas generator in any one of Claim 1 to 6 including the deformation | transformation suppression part which becomes.   The gas generator according to any one of claims 1 to 7, wherein the resin molding part completely covers a surface of the ignition part.   The gas generator according to any one of claims 1 to 8, wherein, of the wall surfaces defining the combustion chamber, a wall surface positioned on the opening end side is configured only by the resin molding portion.   The gas generator according to any one of claims 1 to 9, wherein the resin molding portion is formed by insert molding using a thermosetting resin as a raw material.   The gas generator according to any one of claims 1 to 9, wherein the resin molding portion is formed by insert molding using a thermoplastic resin containing glass fibers as a raw material.

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