Wirewound Filter

Abstract

To provide a coil filter which has the shape holding property similar to a conventional technique even though thermal processing is not applied thereto, and can be easily manufactured.SOLUTION: There is provided a coil filter which is formed into a cylindrical body having a stitch by superimposing metal wire materials 91 forming a plurality of layers on each other in the radial direction, in which a terminal part (adhesive part 93) of the metal wire material 91 on the outermost layer in the plurality of layers is joined by being bonded to at least a portion of a layer adjacent on the radial direction inner side to the outermost layer, by being drawn to the inner surface side via one axial direction end to be bonded to at least a portion of the innermost layer, or by being bonded to a portion of the one axial direction end, and the joint strength of the terminal part (adhesive part 93) of the metal wire material 91 on the outermost layer is equal to or greater than 5 N.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a wire wound filter for a gas generator incorporated in an occupant protection device for protecting an occupant in the event of a vehicle collision. [Background technology]

[0002] Airbag devices, which are passenger protection devices, have become widespread from the viewpoint of protecting passengers in automobiles, etc. Airbag devices are installed to protect passengers from impacts that occur during a vehicle collision, and the airbag instantly inflates and deploys during a vehicle collision, thereby acting as a cushion to support the passenger's body.

[0003] The gas generator is incorporated into this airbag device. When a vehicle crashes, the control unit energizes the igniter, which then ignites the igniter with the flame generated by the igniter, burning the gas generating agent and instantly generating a large amount of gas, which inflates and deploys the airbag.

[0004] Gas generators have a variety of structures, but a gas generator that is particularly suitable for use in a driver's side airbag device, a passenger's side airbag device, etc. is a short, approximately cylindrical disk-type gas generator with a relatively large outer diameter.

[0005] A disk-type gas generator has a short, approximately cylindrical housing with both axial ends closed, a plurality of gas outlets provided in the peripheral wall of the housing, a transfer charge contained inside the housing so as to face an igniter assembled to the housing, a gas generating agent filled inside the housing so as to surround the transfer charge, and a filter contained inside the housing so as to further surround the gas generating agent.

[0006] For example, Patent Document 1 discloses a wire-wound filtering element (wire-wound filter) comprising at least one wire wound in a cylindrical and net-like shape and including a plurality of overlapping portions formed by adjacent portions of the wire overlapping each other, wherein the plurality of overlapping portions comprise two or more fixed portions where the adjacent portions are fixed to each other, and non-fixed portions where the adjacent portions are not fixed to each other, and wherein the overlapping portions formed by adjacent portions of the wire constituting the outermost layer and an adjacent layer adjacent to the outermost layer in the diameter reduction direction each include the non-fixed portions. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5094047 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0008] The wire-wound filter of Patent Document 1 is a non-sintered filter that has not been heat-treated, but in order to maintain its shape during assembly and operation of the gas generator, two or more fixing portions by welding are required at the overlapping portions, as described above. However, in recent years, there has been a demand for a non-sintered wire-wound filter that can maintain its shape during assembly and operation of the gas generator and that can be manufactured more easily.

[0009] The present invention has been made in view of the above circumstances, and has an object to provide a wire-wound filter that can be manufactured more easily while retaining the same shape retention as conventional filters, even without heat treatment. [Means for solving the problem]

[0010] (1) The present invention is a non-sintered wire-wound filter in which at least one wire forming a plurality of radial layers is overlapped with another wire to form a tubular body having a mesh, and in which an end portion of the wire in the outermost layer of the plurality of layers is bonded to a part of an adjacent layer at least radially inside the outermost layer, or is pulled to the inner side through one of the axial end portions and bonded to at least a part of the innermost layer, or is bonded to a part of one of the axial end portions, They are joined by In the wire, at least a portion other than a portion to which the end portion of the wire in the outermost layer is bonded, or a portion other than a portion to which the end portion of the wire in the outermost layer is bonded, and a portion other than a portion bonded to at least one of the portions other than the end portion of the wire in the outermost layer and the adjacent layer are not heat-treated, The joining strength of the terminal end is 5N or more.

[0011] (2) In the gas generator of (1) above, it is preferable that the bonding is by welding, and the joint strength of the terminal end portion is welding strength.

[0012] (3) From another perspective, the present invention provides a non-sintered wire-wound filter formed into a cylindrical body having a mesh by overlapping at least one wire forming a plurality of layers in the radial direction, The wires in the outermost layer of the plurality of layers are joined by being bonded to a part of a layer (hereinafter referred to as an adjacent layer) adjacent to the outermost layer on the radially inner side, In the wire, at least a portion other than a portion to which the end portion of the wire in the outermost layer is bonded, or a portion other than a portion to which the end portion of the wire in the outermost layer is bonded, and a portion other than a portion bonded to at least one of the portions other than the end portion of the wire in the outermost layer and the adjacent layer are not heat-treated, The terminal end portion may be characterized by being joined to the adjacent layer at either a region within a length that is less than half the length from the axial midpoint of the cylindrical body to one axial end of the cylindrical body, or a region within a length that is less than half the length from the axial midpoint of the cylindrical body to the other axial end of the cylindrical body.

[0013] (4) In the gas generators of (1) to (3) above, it is preferable that a corner of at least one of both axial end portions of the cylindrical body is formed into a rounded shape when viewed from the side.

[0014] (5) In the gas generator of (4) above, the rounded shape is preferably formed by arranging at least two of the wires in parallel.

[0015] (6) In the gas generator of (4) or (5) above, it is preferable that the wire at the end face of the end portion formed in the rounded shape is arranged along a plane that is approximately perpendicular to the axial direction of the cylindrical body. (7) In the gas generator of (1) above, the wires of the outermost layer have curved portions along the adjacent layer, and a terminal end of the wire of the outermost layer, when bonded to a part of an adjacent layer at least radially inward from the outermost layer, is a terminal end of the curved portion, when drawn inward via one of the axial ends and bonded to at least a part of the innermost layer, is a terminal end of the wire extended from the curved portion to the inner surface, or when bonded to a part of one of the axial ends, is a terminal end of the wire extended from the curved portion to the axial end, and it is preferable that a part of the wire of the outermost layer bonded to the adjacent layer at least at one point of any part other than the terminal end of the wire is located in any part of the curved portion. (8) In the gas generator of (3) above, in the case where a portion of the wire other than a portion to which the terminal end of the wire in the outermost layer is bonded and a portion other than a portion bonded to at least one of any portion other than the terminal end of the wire in the outermost layer and the adjacent layer are at least portions that are not heat treated, the wire in the outermost layer has a curved portion along the adjacent layer, and the terminal end of the wire in the outermost layer is bonded to a part of an adjacent layer at least radially inward from the outermost layer, it is a terminal end of the curved portion, and it is preferable that a portion bonded to at least one of any portion other than the terminal end of the wire of the outermost layer and the adjacent layer is located in any of the curved portions. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a wire-wound filter that can be manufactured more easily while maintaining the same shape retention as conventional filters, even without heat treatment. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic cross-sectional view of a disk-type gas generator according to a first embodiment of the present invention. [Figure 2] 2A and 2B are schematic diagrams of the wire-wound filter of the disk-type gas generator of FIG. 1, in which (a) is a top view and (b) is a side view. [Figure 3] FIG. 3 is an enlarged view of a terminal end of the wire-wound filter of FIG. 2. [Figure 4] FIG. 3 is a schematic perspective view of a modified example of the wire-wound filter of FIG. 2, showing the position where the ends of the wires are joined. [Figure 5] 3A and 3B are diagrams for explaining calculation of the load applied to the welded portion of the wire-wound filter of FIG. 2, in which (a) is a perspective view showing a cylindrical model for calculating the load applied to the adhesive portion, and (b) is an enlarged cutaway view of (a). [Figure 6] FIG. 10 is a schematic diagram illustrating a case where a wire-wound filter according to a second embodiment of the present invention is wound twice from one end to the other end, and is a diagram for explaining events that occur during assembly. [Figure 7] FIG. 6(a) is a cross-sectional view illustrating a gap portion of a gas generator according to a second embodiment of the present invention, and (b) is an enlarged view of a part of the wire-wound filter in (a). [Figure 8]FIG. 10 is a schematic diagram illustrating a modified example of the second embodiment of the present invention in which the wire-wound filter is wound three times from one end to the other end, and is a diagram for explaining events that occur during assembly. [Figure 9] FIG. 10 is a schematic cross-sectional view of a disk-shaped gas generator according to a third embodiment of the present invention. [Figure 10] FIG. 9 is a side view of the wire wound filter of the disk-type gas generator of FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0018] First Embodiment A first embodiment of the present invention will be described in detail below with reference to the drawings. In the embodiment shown below, a wire-wound filter of the present invention is applied to a disc-type gas generator that is suitably incorporated into an airbag device mounted on the steering wheel of an automobile or the like.

[0019] Fig. 1 is a schematic diagram of a disk-shaped gas generator 100 in an embodiment of the present invention. First, with reference to Fig. 1, the configuration of disk-shaped gas generator 100 in the present embodiment will be described.

[0020] 1, disk-type gas generator 100 has a short, substantially cylindrical housing with one axial end and the other end closed, and an accommodation space provided inside this housing accommodates internal components such as retaining section 30, igniter 40, cup-shaped member 50, transfer charge 59, gas generating agent 61, lower support member 70, upper support member 80, cushion material 85, and filter 90 (wire wound filter). Also, a combustion chamber 60 is located in the accommodation space provided inside the housing, and mainly accommodates gas generating agent 61, one of the above-mentioned internal components.

[0021] The housing includes a lower shell 10 and an upper shell 20. Each of the lower shell 10 and the upper shell 20 is a press-molded product formed, for example, by pressing a rolled metal plate-like member. The metal plate-like members constituting the lower shell 10 and the upper shell 20 are made of metal plates made of, for example, stainless steel, iron steel, aluminum alloy, stainless alloy, etc., and preferably so-called high-tensile steel plates that do not break or otherwise damage even when a tensile stress of 440 MPa or more and 780 MPa or less is applied are used.

[0022] The lower shell 10 and the upper shell 20 are each formed in a generally cylindrical shape with a bottom, and are assembled and joined together with their open surfaces facing each other to form a housing. The lower shell 10 has a bottom plate portion 11 and a peripheral wall portion 12, and the upper shell 20 has a top plate portion 21 and a peripheral wall portion 22.

[0023] The upper end of the peripheral wall 12 of the lower shell 10 is inserted into the lower end of the peripheral wall 22 of the upper shell 20 and press-fitted. Furthermore, the peripheral wall 12 of the lower shell 10 and the peripheral wall 22 of the upper shell 20 are joined at or near their abutment, thereby fixing the lower shell 10 and the upper shell 20 together. Here, electron beam welding, laser welding, friction welding, or the like can be suitably used to join the lower shell 10 and the upper shell 20 together.

[0024] As a result, the portion of the peripheral wall of the housing closer to the bottom plate 11 is formed by the peripheral wall 12 of the lower shell 10, and the portion of the peripheral wall of the housing closer to the top plate 21 is formed by the peripheral wall 22 of the upper shell 20. One end and the other end in the axial direction of the housing are closed by the bottom plate 11 of the lower shell 10 and the top plate 21 of the upper shell 20, respectively.

[0025] A protruding cylindrical portion 13 that protrudes toward the top plate portion 21 is provided in the center of the bottom plate portion 11 of the lower shell 10, thereby forming a recessed portion 14 in the center of the bottom plate portion 11 of the lower shell 10. The protruding cylindrical portion 13 is a portion where the igniter 40 is fixed via the holding portion 30, and the recessed portion 14 is a portion that provides space for providing the female connector portion 34 in the holding portion 30.

[0026] Protruding tube portion 13 is formed in a generally cylindrical shape with a bottom, and an opening 15 having a point-asymmetric shape (for example, a D-shape, a barrel shape, an oval shape, or the like) in a plan view is provided at its axial end portion located on the top plate portion 21 side. Opening 15 is a portion through which a pair of terminal pins 42 of igniter 40 are inserted.

[0027] Igniter 40 is for generating a flame and includes ignition unit 41 and the above-mentioned pair of terminal pins 42. Igniter unit 41 contains an ignition charge that ignites and burns to generate a flame when activated, and a resistor for igniting the ignition charge. The pair of terminal pins 42 are connected to ignition unit 41 to ignite the ignition charge.

[0028] More specifically, the ignition unit 41 comprises a cup-shaped squib cup and a plug that closes the open end of the squib cup and through which a pair of terminal pins 42 are inserted and held; a resistor (bridge wire) is attached to connect the tips of the pair of terminal pins 42 inserted into the squib cup; and an ignition charge is loaded into the squib cup so as to surround or be close to the resistor.

[0029] Here, nichrome wire is generally used as the resistor, and ZPP (zirconium potassium perchlorate), ZWPP (zirconium tungsten potassium perchlorate), lead tricinate, etc. are generally used as the ignition charge. The squib cup and plug mentioned above are generally made of metal or plastic.

[0030] When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 42. This current flow generates Joule heat in the resistor, causing the ignition charge to begin burning. The high-temperature flame generated by the combustion ruptures the squib cup containing the ignition charge. The time from when the current flows through the resistor to when the igniter 40 is activated is generally 2 ms or less when nichrome wire is used for the resistor.

[0031] Igniter 40 is attached to bottom plate 11 in a state where it is inserted from the inside of lower shell 10 so that terminal pin 42 passes through opening 15 provided in protruding cylindrical portion 13. Specifically, a holding portion 30 made of a resin molded portion is provided around protruding cylindrical portion 13 provided on bottom plate 11, and igniter 40 is fixed to bottom plate 11 by being held by holding portion 30.

[0032] The retaining portion 30 is formed by injection molding (more specifically, insert molding) using a mold, and is formed by adhering an insulating fluid resin material to the bottom plate portion 11 of the lower shell 10 so that it passes through an opening 15 provided in the bottom plate portion 11 and reaches from a portion of the inner surface of the bottom plate portion 11 to a portion of the outer surface, and then solidifying it.

[0033] As the raw material for the holding portion 30 formed by injection molding, a resin material that exhibits excellent heat resistance, durability, corrosion resistance, and the like after hardening is preferably selected and used. In this case, it is not limited to thermosetting resins such as epoxy resin, but thermoplastic resins such as polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin (e.g., nylon 6, nylon 66, etc.), polypropylene sulfide resin, and polypropylene oxide resin can also be used. When such a thermoplastic resin is selected as the raw material, it is preferable to incorporate glass fiber or the like as a filler into the resin material to ensure the mechanical strength of the holding portion 30 after molding. However, if sufficient mechanical strength can be ensured with the thermoplastic resin alone, it is not necessary to add the filler described above.

[0034] The retaining portion 30 has an inner covering portion 31 that covers part of the inner surface of the bottom plate portion 11 of the lower shell 10, an outer covering portion 32 that covers part of the outer surface of the bottom plate portion 11 of the lower shell 10, and a connecting portion 33 that is located within the opening 15 provided in the bottom plate portion 11 of the lower shell 10 and is continuous with the inner covering portion 31 and the outer covering portion 32, respectively.

[0035] The retaining portion 30 is fixed to the bottom plate portion 11 on the surfaces of the inner covering portion 31, the outer covering portion 32, and the connecting portion 33 that face the bottom plate portion 11. The retaining portion 30 is also fixed to the side and bottom surfaces of the ignition portion 41 of the igniter 40 near the lower end, and to the surface of the terminal pin 42 of the igniter 40 near the upper end.

[0036] As a result, opening 15 is completely filled with terminal pin 42 and holding portion 30, and the sealing of this portion ensures airtightness of the space inside the housing. Since opening 15 is formed in an asymmetrical shape in a plan view as described above, by filling opening 15 with connecting portion 33, opening 15 and connecting portion 33 also function as an anti-rotation mechanism that prevents holding portion 30 from rotating relative to bottom plate portion 11.

[0037] A female connector portion 34 is formed on the portion of the outer covering portion 32 of the holding portion 30 facing outward. This female connector portion 34 is a portion for receiving a male connector (not shown) of a harness for connecting the igniter 40 to a control unit (not shown), and is located in a recess 14 provided in the bottom plate portion 11 of the lower shell 10.

[0038] A portion of the terminal pin 42 of the igniter 40 near the lower end is exposed and disposed within this female connector portion 34. A male connector is inserted into the female connector portion 34, thereby establishing electrical continuity between the core wire of the harness and the terminal pin 42.

[0039] The above-described injection molding may also be performed using a lower shell 10 in which an adhesive layer is provided in advance at a predetermined position on the surface of the bottom plate portion 11 in the portion that will be covered by the holding portion 30. The adhesive layer can be formed by applying adhesive to a predetermined position on the bottom plate portion 11 in advance and then curing the adhesive.

[0040] In this way, the hardened adhesive layer is positioned between the bottom plate portion 11 and the holding portion 30, so that the holding portion 30, which is made of a resin molded portion, can be more firmly fixed to the bottom plate portion 11. Therefore, if the adhesive layer is provided in a ring shape along the circumferential direction so as to surround the opening 15 provided in the bottom plate portion 11, it is possible to ensure higher sealing performance in that portion.

[0041] Here, the adhesive to be applied in advance to the bottom plate portion 11 is preferably one containing as a raw material a resin material that has excellent heat resistance, durability, corrosion resistance, etc. after hardening, and is particularly preferably one containing as a raw material a cyanoacrylate resin or a silicone resin. In addition to the above-mentioned resin materials, materials containing raw materials such as phenolic resins, epoxy resins, melamine resins, urea resins, polyester resins, alkyd resins, polyurethane resins, polyimide resins, polyethylene resins, polypropylene resins, polyvinyl chloride resins, polystyrene resins, polyvinyl acetate resins, polytetrafluoroethylene resins, acrylonitrile butadiene styrene resins, acrylonitrile styrene resins, acrylic resins, polyamide resins, polyacetal resins, polycarbonate resins, polyphenylene ether resins, polybutylene terephthalate resins, polyethylene terephthalate resins, polyolefin resins, polyphenylene sulfide resins, polysulfone resins, polyethersulfone resins, polyarylate resins, polyetheretherketone resins, polyamideimide resins, liquid crystal polymers, styrene rubbers, and olefin rubbers can also be used as the above-mentioned adhesives.

[0042] Here, an example of a configuration has been given in which the igniter 40 can be fixed to the lower shell 10 by injection molding the retaining portion 30 made of a resin molded portion, but other alternative means can also be used to fix the igniter 40 to the lower shell 10.

[0043] A cup-shaped member 50 is attached to the bottom plate 11 so as to cover the protruding tube 13, the holding portion 30, and the igniter 40. The cup-shaped member 50 has a generally cylindrical shape with a bottom that is open at the end on the bottom plate 11 side, and includes a space therein for accommodating a transfer charge 59. The cup-shaped member 50 is positioned so that it protrudes into the combustion chamber 60 that accommodates the gas generating agent 61, with the space provided therein facing the ignition portion 41 of the igniter 40.

[0044] The cup-shaped member 50 has a top wall portion 51, a cylindrical side wall portion 52 extending from the periphery of the top wall portion 51 toward the bottom plate portion 11, and an extension portion 53 extending radially outward from the opening end, which is the end of the side wall portion 52 on the bottom plate portion 11 side.

[0045] The extension portion 53 is formed to extend along the inner surface of the bottom plate portion 11 of the lower shell 10. Specifically, the extension portion 53 has a curved shape to follow the shape of the inner bottom surface of the bottom plate portion 11 at and near the portion where the protruding tubular portion 13 is provided, and includes a tip portion 54 extending in a flange shape at its radially outer portion.

[0046] The tip 54 of the extension 53 is disposed between the bottom plate 11 and the lower support member 70 along the axial direction of the housing, and is thereby sandwiched between the bottom plate 11 and the lower support member 70 along the axial direction of the housing. As a result, the tip 54 of the extension 53 of the cup-shaped member 50 is pressed toward the bottom plate 11 by the lower support member 70, and the cup-shaped member 50 is fixed to the bottom plate 11. This prevents the cup-shaped member 50 from falling off the bottom plate 11 without using crimping or press-fitting to fix the cup-shaped member 50.

[0047] Cup-shaped member 50 has no openings in either side wall 52 or top wall 51, and surrounds an internal space. When transfer charge 59 in transfer chamber 57 is ignited by activation of igniter 40, cup-shaped member 50 bursts, deforms, or melts due to an increase in pressure in the internal space and conduction of the generated heat.

[0048] Suitable materials for the cup-shaped member 50 include metal members such as stainless steel, steel, aluminum, aluminum alloy, stainless steel, stainless steel alloy, etc., and resin members such as thermosetting resins typified by epoxy resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin (e.g., nylon 6, nylon 66, etc.), polypropylene sulfide resin, polypropylene oxide resin, etc. In particular, aluminum alloys or iron-based metal materials such as stainless steel and steel, which have relatively higher mechanical strength than aluminum, are preferred.

[0049] The method for fixing the cup-shaped member 50 is not limited to the above-described fixing method using the lower support member 70, and other fixing methods may be used.

[0050] The transfer charge 59 filled in the transfer chamber 57 is ignited by the flame generated by the activation of the igniter 40, and generates thermal particles as it burns. The transfer charge 59 must be capable of reliably starting the combustion of the gas generant 61, and generally, a composition made of a metal powder / oxidizer, such as B / KNO3, B / NaNO3, or Sr(NO3)2, a composition made of titanium hydride / potassium perchlorate, or a composition made of B / 5-aminotetrazole / potassium nitrate / molybdenum trioxide, is used.

[0051] The enhancer charge 59 may be in a powder form, or may be formed into a predetermined shape using a binder. The enhancer charge 59 formed using a binder may have various shapes, such as granules, cylinders, sheets, spheres, single-hole cylinders, multi-hole cylinders, tablets, and the like.

[0052] Within the space inside the housing, a combustion chamber 60 containing a gas generating agent 61 is located in the space surrounding the portion in which the cup-shaped member 50 is disposed. Specifically, as described above, the cup-shaped member 50 is disposed so as to protrude into the combustion chamber 60 formed inside the housing, and the space provided in the portion facing the outer surface of the top wall portion 51 of the cup-shaped member 50 and the space provided in the portion facing the outer surface of the side wall portion 52 form the combustion chamber 60. As a result, the gas generating agent 61 is disposed adjacent to the outer surface of the cup-shaped member 50.

[0053] Furthermore, a filter 90 is disposed along the inner periphery of the housing in the space that radially surrounds the combustion chamber 60 that accommodates the gas generating agent 61. The filter 90 has a cylindrical shape and is disposed so that its central axis substantially coincides with the axial direction of the housing.

[0054] The gas generating agent 61 is an agent that is ignited by thermal particles generated by the transfer charge 59 when the igniter 40 is activated, and burns to generate gas. A non-azide gas generating agent is preferably used as the gas generating agent 61, and the gas generating agent 61 is generally formed as a molded body containing a fuel, an oxidizer, and an additive.

[0055] The fuel may be, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof. Specifically, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole, or the like is preferably used.

[0056] Examples of oxidizing agents that can be used include basic metal nitrates such as basic copper nitrate, basic metal carbonates such as basic copper carbonate, perchlorates such as ammonium perchlorate and potassium perchlorate, and nitrates containing cations selected from alkali metals, alkaline earth metals, transition metals, and ammonia. Suitable nitrates include sodium nitrate and potassium nitrate.

[0057] Examples of additives include binders, slag formers, and combustion modifiers. Suitable binders include organic binders such as polyvinyl alcohol, metal salts of carboxymethyl cellulose, and stearates, as well as inorganic binders such as synthetic hydrotalcite and acid clay. Other suitable binders include polysaccharide derivatives such as hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guar gum, polyvinylpyrrolidone, polyacrylamide, and starch, as well as inorganic binders such as molybdenum disulfide, talc, bentonite, diatomaceous earth, kaolin, and alumina. Suitable slag formers include silicon nitride, silica, and acid clay. Suitable combustion modifiers include metal oxides, ferrosilicon, activated carbon, and graphite.

[0058] The shape of the molded body of gas generating agent 61 may be various, including granular, pellet-like, cylindrical, or other particulate shapes, and disc-like shapes. Furthermore, for cylindrical molded bodies, perforated molded bodies having through holes inside the molded body (for example, a single-hole cylindrical shape or a multi-hole cylindrical shape) are also used. These shapes are preferably selected as appropriate depending on the specifications of the airbag device into which disk-shaped gas generator 100 is incorporated, and it is preferable to select an optimal shape depending on the specifications, such as selecting a shape in which the gas generation rate changes over time when gas generating agent 61 is burned. Furthermore, in addition to the shape of gas generating agent 61, it is preferable to select the size and filling amount of the molded body as appropriate, taking into consideration the burning rate, pressure exponent, etc. of gas generating agent 61.

[0059] As shown in FIG. 2 , the filter 90 is a cylindrical body formed by overlapping at least one wire (e.g., a metal wire 91 such as stainless steel or steel) forming multiple layers in the radial direction, and is not sintered. Specifically, the filter 90 is formed by spirally winding the metal wire 91 around a cylindrical bobbin (not shown) serving as an axial member with a predetermined pitch, winding width, crossing angle, etc. to form a mesh, and then removing the bobbin to form a hollow cylindrical body. Furthermore, without heat treatment, the terminal end of the metal wire 91 in the outermost layer of the multiple layers is bonded to a part of an adjacent layer 92 radially inward of the outermost layer at a bonding portion 93 (see FIG. 3 ; the adjacent layer is not shown in FIG. 3 ). It is noted that not only the terminal end of the metal wire 91 in the outermost layer, but also one or more portions of the metal wire 91 in the outermost layer other than the terminal end may be bonded to the adjacent layer 92. This prevents the metal wires 91 forming the filter 90 from unraveling even if the terminal ends of the metal wires 91 in the outermost layer come off. Similarly, in the filters in other embodiments and modifications described below, not only the terminal ends of the metal wires in the outermost layer but also one or more portions of the metal wires in the outermost layer other than the terminal ends may be bonded to adjacent layers.

[0060] While any bonding method may be used, welding is preferred. Examples of welding methods and welding positions include: Wide-area welding with a large electrode on the outer surface of filter 90A (see bonding portion 93A in FIG. 4(a)), wide-area welding with a metal patch on the outer surface of filter 90B (see bonding portion 93B in FIG. 4(b)), full-area welding penetrating from the outer diameter side to the inner diameter side of filter 90C (see bonding portion 93C in FIG. 4(c)), seamless welding on the outer surface of filter 90D (see bonding portion 93D in FIG. 4(d)), welding the end of the metal wire 91 in the outermost layer of filter 90E to the inner side via the axial end and then welding to the innermost layer (see bonding portion 93E in FIG. 4(e)), and welding to a portion of one of the axial ends of filter 90F (see bonding portion 93F in FIG. 4(f)).

[0061] Furthermore, it is preferable that the bonding strength of the terminal end (adhesive portion 93) is 5N or more, and the reason for this will be explained below with reference to Figures 3 and 5. Here, Figure 5(a) is a diagram showing a cylindrical model 90G (assumed to correspond to the filter 90) for calculating the load received by the adhesive portion 93, and (b) is an enlarged cutaway view of a portion 90H of the area surrounded by the dotted line in (a).

[0062] In gas generator 100, gas generated inside filter 90 is discharged via filter 90 and gas outlet 23. Therefore, during operation of gas generator 100, filter 90 is subjected to pressure (internal pressure) from the inner diameter side to the outside until the inside reaches a state of equilibrium with the outside atmosphere. The load applied to adhesive part 93 at this time will be calculated from the formula for calculating stress (hoop stress) generated in the cylindrical model of Fig. 5 when the above-mentioned pressure (internal pressure) is applied.

[0063] [Principal stress occurring in a cylinder] σθ (circumferential stress: generated in the direction of the arrow in Figure 5(b)) = (D (inner diameter: mm) × P (high-limit output, differential pressure between the inside and outside of the filter 90 during high-temperature operation: MPa)) / (2 × T (thickness of the filter 90: mm))

[0064] [Load applied to adhesive part 93] Fθ (occurs in the direction of the white arrow in Figure 3) = σθ × A (cross-sectional area of ​​the metal wire 91: mm 2 )

[0065] Here, we used the above formula to calculate how the load on the adhesive joint 93 changes depending on the conditions when the diameter of the metal wire 91 is 0.4 mm. The hoop stress formula calculates the stress generated in the cross section of the cylinder model. However, because the filter 90 is a wire-wound filter, its cross section is coarse (not dense), and the hoop stress formula must be corrected to assume a lower density than the uniform cylinder shown in Figure 5. Therefore, we calculated the density ratio from the actual weight of the filter 90 compared to the weight of a uniform cylinder, and set a correction coefficient for the thickness so that the thickness of the cylinder is smaller (the cross-sectional area is smaller) by that ratio. The conditions (two patterns) and their results are shown in Table 1 below.

[0066] [Table 1]

[0067] From the above results, it can be seen that the load applied to the adhesive portion 93 varies slightly depending on the number of moles of gas generated, but that if the adhesive portion 93 has a welding strength of approximately 5 N, it can withstand the load applied to the adhesive portion 93 during operation. Therefore, it is preferable that the bonding strength of the adhesive portion 93 is 5 N or more. A filter 90 having these configurations has the same shape retention as conventional filters even without being heat-treated. Furthermore, because it is only necessary to bond the adhesive portion 93, the filter 90 can be manufactured more easily than conventional filters.

[0068] The filter 90 also functions as a cooling means for cooling the gas generated in the combustion chamber 60 by removing the high-temperature heat of the gas as the gas passes through the filter 90, and also functions as a removal means for removing residue (slag) and the like contained in the gas. Therefore, in order to sufficiently cool the gas and prevent the residue from being released to the outside, it is necessary to ensure that the gas generated in the combustion chamber 60 passes through the filter 90. The filter 90 is disposed at a distance from the peripheral wall portions 12, 22 of the lower shell 10 and the peripheral wall portion 22 of the upper shell 20 that constitute the peripheral wall portions of the housing, so that a gap 28 of a predetermined size is formed between the filter 90 and the peripheral wall portions 12, 22.

[0069] A plurality of gas outlets 23 are provided in the peripheral wall 22 of the upper shell 20 in a portion facing the filter 90. The plurality of gas outlets 23 are for directing the gas that has passed through the filter 90 to the outside of the housing.

[0070] Additionally, a metal sealing tape 24 is attached to the inner peripheral surface of the peripheral wall portion 22 of the upper shell 20 as a sealing member to close the plurality of gas ejection ports 23. As this sealing tape 24, an aluminum foil with an adhesive member applied to one side can be suitably used, and the sealing tape 24 ensures the airtightness of the combustion chamber 60.

[0071] A lower support member 70 is disposed near the end of the combustion chamber 60 that is located on the bottom plate portion 11 side. The lower support member 70 has an annular shape and is disposed substantially between the filter 90 and the bottom plate portion 11 so as to cover the boundary between the filter 90 and the bottom plate portion 11.

[0072] The lower support member 70 has an annular plate-shaped base portion 71 that is fitted to the bottom plate portion 11 so as to fit along the inner bottom surface of the bottom plate portion 11, an abutting portion 72 that abuts against the inner peripheral surface of the filter 90 closer to the bottom plate portion 11, and a tubular upright portion 73 that stands from the base portion 71 toward the top plate portion 21. The abutting portion 72 extends from the outer edge of the base portion 71, and the upright portion 73 extends from the inner edge of the base portion 71. The upright portion 73 covers the outer peripheral surface of the protruding tubular portion 13 of the lower shell 10 and the outer peripheral surface of the inner covering portion 31 of the holding portion 30 via the extension portion 53 of the cup-shaped member 50.

[0073] The lower support member 70 is a member for fixing the filter 90 to the housing, and also functions as an outflow prevention means for preventing gas generated in the combustion chamber 60 from flowing out through the gap between the lower end of the filter 90 and the bottom plate portion 11 without passing through the inside of the filter 90 when the igniter 40 is activated. For this reason, the lower support member 70 is formed, for example, by pressing a metal plate-shaped member, and is preferably made of a member made of a steel plate such as ordinary steel or special steel (for example, a cold-rolled steel plate or a stainless steel plate).

[0074] An upper support member 80 is disposed at the end of the combustion chamber 60 that is located on the top plate portion 21 side. The upper support member 80 has a substantially disk-like shape, and is disposed between the filter 90 and the top plate portion 21 so as to cover the boundary between the filter 90 and the top plate portion 21. As a result, the upper support member 80 is positioned near the end of the combustion chamber 60, between the top plate portion 21 and the gas generating agent 61.

[0075] The upper support member 80 has a base 81 that abuts against the top plate 21, and an abutment portion 82 that stands upright from the periphery of the base 81. The abutment portion 82 abuts against the inner circumferential surface of the axial end portion of the filter 90 that is located on the top plate 21 side.

[0076] The upper support member 80 is a member for fixing the filter 90 to the housing, and also functions as an outflow prevention means for preventing gas generated in the combustion chamber 60 from flowing out through the gap between the upper end of the filter 90 and the top plate portion 21 without passing through the inside of the filter 90 when the igniter 40 is activated. For this reason, the upper support member 80 is formed, for example, by pressing a metal plate-shaped member, and is preferably made of a member made of a steel plate such as ordinary steel or special steel (for example, a cold-rolled steel plate or a stainless steel plate).

[0077] A circular plate-shaped cushion material 85 is arranged inside the base 81 of the upper support member 80 so as to come into contact with the gas generating agent 61 accommodated in the combustion chamber 60. The cushion material 85 is provided for the purpose of preventing the gas generating agent 61 made of a molded body from being crushed by vibration or the like, and is preferably made of a member made of a ceramic fiber molded body, rock wool, foamed resin (for example, foamed silicone, foamed polypropylene, foamed polyethylene, foamed urethane, etc.), rubber represented by chloroprene and EPDM, or the like.

[0078] Here, the cushion material 85 is positioned between the top plate portion 21 and the gas generating agent 61 in the portion of the combustion chamber 60 on the top plate portion 21 side. Therefore, the cushion material 85 presses the gas generating agent 61 toward the bottom plate portion 11 side.

[0079] Next, with reference to FIG. 1, a procedure for assembling disk-shaped gas generator 100 in the present embodiment will be described.

[0080] First, the igniter 40 is fixed to the lower shell 10 by injection molding the retaining portion 30, which is made of a resin molded portion. Then, the side wall portion 52 of the cup-shaped member 50, which contains the transfer charge 59, is press-fitted into the retaining portion 30 of the lower shell 10 to fix it. Next, the lower support member 70 is placed on the tip portion 54 of the extension portion 53 of the cup-shaped member 50, and the filter 90 is inserted and positioned toward the inner bottom surface of the lower shell 10.

[0081] Then, gas generating agent 61 is filled inside filter 90, cushioning material 85 is placed on the inner surface of base 81 of upper support member 80, and upper support member 80 is inserted into the upper end portion of filter 90. Thereafter, upper shell 20, with gas ejection port 23 closed with sealing tape 24, is placed over lower shell 10, and lower shell 10 and upper shell 20 are welded together. This completes the assembly of disc-type gas generator 100 having the structure shown in FIG. 1 .

[0082] Here, in disk-shaped gas generator 100 in the present embodiment, no opening is provided in cup-shaped member 50, and therefore the step of filling transfer charge 59 into transfer chamber 57 provided inside cup-shaped member 50 can be carried out very easily. This is because cup-shaped member 50 itself is constructed of a fragile member with low mechanical strength so that a part of the cup-shaped member will rupture, deform or melt when disk-shaped gas generator 100 is activated. In other words, the work of closing the opening provided in the cup-shaped member in order to fill it with transfer charge 59, such as with aluminum tape or a closing plate, which was necessary when a cup-shaped member having an opening was used, is no longer necessary, and the manufacturing process can be greatly simplified.

[0083] Next, the operation of disk-shaped gas generator 100 in the present embodiment will be described.

[0084] 1, when a vehicle equipped with disk-shaped gas generator 100 collides, the collision is detected by collision detection means separately provided in the vehicle, and based on this, a control unit separately provided in the vehicle supplies current to activate igniter 40. Transfer charge 59 accommodated in transfer chamber 57 is ignited by a flame generated by the activation of igniter 40, and begins to burn.

[0085] At this time, immediately after the igniter 40 is activated, the ignition charge loaded in the ignition section 41 burns rapidly, causing the squib cup of the ignition section 41 to burst, and the heat generated by the rapid combustion of the ignition charge is transmitted to the transfer charge 59 filled in the transfer chamber 57.

[0086] Subsequently, the thrust reaches the top wall 51 of the cup-shaped member 50, causing the cup-shaped member 50, which is made of a fragile material, to burst, deform, or melt. This burst, deformation, or melting of the cup-shaped member 50 occurs later than the ignition of the transfer charge 59 by the heat particles generated by the combustion of the ignition charge. Here, the transfer charge 59 of the cup-shaped member 50 is subjected to the thrust generated by the combustion of the ignition charge and is scattered and dispersed inside the cup-shaped member 50.

[0087] Therefore, in a short time, the transfer charge 59 located farther from the igniter 40 is also ignited by the thermal particles and begins to burn, which results in a significant increase in pressure and temperature in the space inside the cup-shaped member 50. As a result, the cup-shaped member 50 bursts, deforms, or melts in a short time, and a large amount of thermal particles generated by the combustion of the transfer charge 59 flows into the combustion chamber 60 early.

[0088] In this way, the transfer charge 59 and a large amount of heat particles generated by the transfer charge 59 flow into the combustion chamber 60, igniting and burning the gas generating agent 61 contained in the combustion chamber 60, generating a large amount of gas. The gas generated in the combustion chamber 60 passes through the inside of the filter 90, and in this process, heat is removed by the filter 90 and the gas is cooled, and slag contained in the gas is removed by the filter 90 and flows into the gap 28.

[0089] Then, as the pressure in the space inside the housing increases due to the combustion of gas generating agent 61, sealing tape 24 that has been closing gas outlet 23 provided in upper shell 20 ruptures, and gas is ejected to the outside of the housing through gas outlet 23. The ejected gas is introduced into the inside of an airbag provided adjacent to disc-shaped gas generator 100, and inflates and deploys the airbag.

[0090] In addition, when the cup-shaped member 50 is made of iron or stainless steel, the strength is higher than when the cup-shaped member 50 is made of aluminum. Therefore, the cup-shaped member 50 does not rupture, deform, or melt in the initial stage of combustion of the enhancer charge 59. At this time, the internal pressure of the cup-shaped member 50 increases until a predetermined time has elapsed at which the cup-shaped member 50 ruptures, deforms, or melts. Then, once the internal pressure reaches a certain level, the cup-shaped member 50 ruptures, deforms, or melts. Therefore, by using an iron-based metal material with high mechanical strength, such as iron or stainless steel, for the cup-shaped member 50, the mechanical strength can be increased to sufficiently promote the combustion of the enhancer charge 59 when the cup-shaped member 50 is ruptured, thereby rupturing the cup-shaped member 50. Such an improvement in the mechanical strength of the cup-shaped member 50 can be achieved by increasing its thickness, even when a metal with low strength, such as aluminum, is used. In this case, the thickness is preferably 0.4 mm to 1.5 mm, and more preferably 0.6 mm to 1.2 mm.

[0091] As described above, since it is only necessary to bond the adhesive portion 93, the filter 90 can be manufactured more easily than conventional filters.

[0092] Furthermore, when the bonding strength of adhesive 93 is 5 N or more, filter 90 can have the same shape retention as conventional filters even without heat treatment. In particular, adhesive 93 can be prevented from breaking during assembly and operation.

[0093] Second Embodiment Next, a second embodiment of the present invention will be described in detail with reference to the drawings. The gas generator of this embodiment is similar to that of the first embodiment except for the filter 90 and the lower shell 10 that forms the housing. Therefore, description and illustration of similar portions will be omitted unless otherwise specifically described, and a description will be given of a filter 190 used in this embodiment shown in FIG. 6. Furthermore, unless otherwise specifically described, components having the same last two digits as those in the above-described embodiment are the same members, and therefore description thereof will be omitted. Here, in FIG. 6, (a-1) is a side view showing a state of filter 190 in one step during assembly, (a-2) is a top view of filter 190 in (a-1), (b-1) is a side view showing a state of filter 190 in one step during assembly after (a-1), and (b-2) is a top view of filter 190 in (b-1).

[0094] The filter 190 is made of metal wires 191 wound in a spiral shape from one axial end to the other axial end with two turns per layer, and is not sintered. The filter 190 is also different from the filter 90 of the first embodiment mainly in that the end portions of the metal wires 191 in the outermost layer are bonded to the adjacent layer in region H (see FIG. 6(c)) by the same bonding means as in the first embodiment to form bonding sections.

[0095] In order to achieve a smaller and lighter gas generator than the first embodiment, the gas generator of the present embodiment has a smaller space corresponding to gap 28 between lower shell 10 and filter 90 of the first embodiment. For example, gap 128 is provided between filter 190 and lower shell 110 as shown in FIG. 7( a). In such a case, as shown in FIG. 7( a), corner W1 may ride up on rounded portion 110a inside lower shell 110. If the upper shell is assembled in this state in the same manner as in the first embodiment, a load is applied only to corner W1. At this time, as shown in FIG. 7( b), part 191a (dashed dotted line) of metal wire 191 located at corner W1 may be pushed upward and shifted to the position shown by the dotted line. If such a shift occurs and there is an adhesive portion of metal wire 191 near or within a certain distance of the adhesive portion, a force (load) that attempts to shear the adhesive portion in the axial direction of filter 190 or peel it off in the radial direction may be applied to the adhesive portion.

[0096] When such a force is applied to the adhesive portion and a portion 191a of the metal wire 191 is pushed up, the winding angle of the metal wire 191 changes because the metal wire 191 is wound in a spiral shape (see the position of the portion 191a of the metal wire 191 indicated by the dashed line in FIG. 6(a-1)), and an excess portion 191b is generated as shown in FIGS. 6(a-1) and (a-2). When this excess portion 191b is pressed by the curved portion 110a (see FIG. 7(a)) inside the lower shell 110, the portion 191a of the metal wire 191 moves toward the portion W2 of the filter 190 as shown in FIGS. 6(b-1) and (b-2), and instead of the excess portion 191b disappearing, an excess portion 191c is generated. If there is an adhesive portion of the metal wire 191 near or within a certain distance from the excess portion 191c (portion W2 of the filter 190), a force (load) that tries to peel the adhesive portion in the outer diameter direction will be applied to the adhesive portion.

[0097] Therefore, the region where the metal wire 191 makes 0 to 0.25 revolutions from the contact position (corner W1) with the rounded portion 110a inside the lower shell 110 as the base point is the range of influence of the part 191a of the metal wire 191 pushed up. Also, the region where the metal wire 191 makes 0.25 to 0.75 revolutions from the contact position (corner W1) with the rounded portion 110a inside the lower shell 110 as the base point is the range of influence of the excess portion 191c of the metal wire 191. In other words, it is not preferable to provide the adhesive portion in the region where the metal wire 191 makes 0 to 0.75 revolutions from the contact position (corner W1 in FIG. 6(c)) with the rounded portion 110a inside the lower shell 110 as the base point (region from the lower end to height S1).

[0098] Furthermore, in consideration of manufacturability of gas generators, the top and bottom (upper and lower) of filter 190 are often not determined, and therefore the same phenomenon may occur at either of the axial end portions. Therefore, it is not preferable to provide the adhesive portion in the region where metal wire 191 makes 0 to 0.75 revolutions around corner W3 in Figure 6(c) (the region from the upper end portion to height S2).

[0099] Therefore, in the filter 190, in the region H (see FIG. 6(c)), the end portions of the metal wires 191 in the outermost layer are bonded to the adjacent layer to form a bonding portion. That is, the bonding portion is located at a position 25% (±12.5% ​​from the central axis) midway in the axial direction of the filter 290.

[0100] With the above configuration, in order to make the filter 90 smaller and more compact than the first embodiment, the space corresponding to the gap 28 between the lower shell 10 and the filter 90 in the first embodiment is reduced, and even if a gap 128 is provided between the filter 190 and the lower shell 110 as shown in Fig. 7(a), for example, the adhesive portion of the filter 190 can be prevented from breaking during assembly and operation. In other words, the filter 190 can maintain its shape similar to that of a conventional filter even without being heat-treated.

[0101] <Modification of the second embodiment> A modified example of the second embodiment of the present invention will now be described in detail with reference to the drawings. The gas generator of this embodiment is similar to that of the first embodiment except for filter 90 and lower shell 10 forming the housing. Therefore, description and illustration of similar portions will be omitted unless otherwise specifically described, and filter 290 used in this embodiment shown in FIG. 8 will be described. Furthermore, components in this modified example whose last two digits are the same as those in the first embodiment are the same members, and therefore description thereof will be omitted unless otherwise specifically described. Here, in FIG. 8, (a-1) is a side view showing a state in one step during assembly of filter 290, (a-2) is a top view of filter 290 in (a-1), (b-1) is a side view showing a state in one step during assembly of filter 290 after (a-1), and (b-2) is a top view of filter 290 in (b-1).

[0102] The filter 290 is made of metal wires 291 wound spirally from one axial end to the other axial end with three turns per layer, and is not sintered. The filter 290 differs from the filter 90 of the first embodiment mainly in that the terminal end of the metal wires 291 in the outermost layer is bonded to the adjacent layer in region H (see FIG. 8(c)) by the same bonding means as in the first embodiment, to form a bonding portion.

[0103] Considering the same as the second embodiment of the present invention, a region of metal wire 291 that makes 0 to 0.25 revolutions from the contact position (corner W1) with the rounded portion inside the lower shell of the gas generator as a base point is a range of influence of part 291a of metal wire 291 pushed up. Furthermore, a region of metal wire 291 that makes 0.25 to 0.75 revolutions from the contact position (corner W1) with the rounded portion inside the lower shell as a base point is a range of influence of surplus part 291c of metal wire 291. In other words, it is not preferable to provide the adhesive portion in a region of metal wire 291 that makes 0 to 0.75 revolutions from the contact position (corner W1 in FIG. 8(c)) with the rounded portion inside the lower shell as a base point (region from the lower end to height S1).

[0104] Furthermore, in consideration of manufacturability of gas generators, the top and bottom (upper and lower) of filter 290 are often not determined, and therefore the same phenomenon may occur at either of the axial end portions. Therefore, it is not preferable to provide the adhesive portion in the region where metal wire 291 makes 0 to 0.75 revolutions around corner W3 in Figure 8(c) (the region from the upper end portion to height S2).

[0105] Therefore, in the filter 290, in the region H (see FIG. 8(c)), the end portions of the metal wires 291 in the outermost layer are bonded to the adjacent layer to form a bonded portion. That is, the bonded portion is located at a position 50% midway in the axial direction of the filter 290 (±25% from the central axis).

[0106] The above configuration can achieve the same effects as the second embodiment.

[0107] <Third embodiment> Next, a third embodiment of the present invention will be described in detail with reference to the drawings. Gas generator 300 of the present embodiment is similar to that of the first embodiment except for filter 90, and therefore description of similar portions will be omitted unless otherwise specifically described, and filter 390 used in the present embodiment shown in Figure 10 will be described. Furthermore, components whose last two digits of the reference numerals in the present embodiment are the same as those in the first embodiment, and therefore description thereof will be omitted unless otherwise specifically described.

[0108] The filter 390 is formed by spirally winding metal wires 391 from one axial end to the other axial end with two turns per layer, and is not sintered. The filter 390 also has the same adhesive means as the first embodiment, whereby the terminal ends of the metal wires 391 in the outermost layer are bonded to the adjacent layer to form adhesive joints similar to those in the first embodiment. However, the filter 390 differs from the filter 90 of the first embodiment mainly in that it has rounded corners 394 near both ends. Here, a rounded shape refers to a gently sloping shape without sharp angles, such as a curved shape or a shape that resembles part of an ellipse when viewed from the side.

[0109] Furthermore, the metal wires 391 on the end faces of the ends of the filter 390 are arranged along a plane that is approximately perpendicular to the axial direction of the filter 390 (in this embodiment, a substantially horizontal plane).

[0110] The corner portion 394 is formed by arranging at least two parallel metal wires 391. The end portion including the corner portion 394 may be formed to have a larger diameter than the central portion, and may be formed to occupy approximately 25% of the area at both ends in the axial direction as the alignment width of the metal wires 391.

[0111] The end portion including the corner portion 394 is formed by winding the metal wire 391 so as to intentionally achieve the state shown in Fig. 10 during the process of forming a filter similar to the filter 90 of the first embodiment. Note that the end portion including the corner portion 394 may also be formed by forming a filter similar to the filter 90 of the first embodiment, winding the metal wire 391 around each of the two end portions, and then compressing and forming the corner portion 394 so that it is rounded.

[0112] Although the embodiments of the present invention have been described above, they are merely illustrative examples and do not limit the present invention, and the specific configurations and the like can be appropriately modified in design. Furthermore, the actions and effects described in the embodiments of the invention are merely a list of the most preferable actions and effects resulting from the present invention, and the actions and effects of the present invention are not limited to those described in the embodiments of the present invention.

[0113] For example, in the second embodiment, the region where no adhesive portion is provided may be only the lower end portion of the filter, if the orientation of the filter to be assembled to the lower shell of the gas generator is determined in advance.

[0114] Furthermore, in the third embodiment, the corner portion 394 may be formed only at the lower end of the filter, provided that the orientation of the filter to be assembled to the lower shell of the gas generator is determined in advance.

[0115] Furthermore, the various parts of the above-described embodiment and modified examples may be combined as appropriate as necessary. [Explanation of symbols]

[0116] 10, 310 Lower side shell 11, 311 Bottom plate part 12, 312 Peripheral wall part 13, 313 Projected tube part 14, 314 recess 15, 315 opening 20, 320 Upper side shell 21, 321 Top plate 22, 322 Peripheral wall part 23, 323 Gas outlet 24, 324 sealing tape 28, 328 Gap 30, 330 Holding part 31, 331 Inner coating 32, 332 Outer covering part 33, 333 connection part 34, 334 female connector part 40, 340 igniter 41, 341 Ignition part 42, 342 terminal pins 50, 350 Cup-shaped member 51, 351 Top wall 52, 352 Side wall 53, 353 Extension section 54, 354 Tip 57, 357 Fire transmission room 59, 359 Transfer powder 60, 360 combustion chamber 61, 361 Gas Generator 70, 370 Lower support member 71, 81, 371, 381 base 72, 82, 372, 382 Contact part 73, 373 erection section 80, 380 Upper support member 85, 385 cushioning material 90, 90A, 90B, 90C, 90D, 90E, 90F, 190, 290, 390 filters 90G cylindrical model 90H (Cylindrical model) part 91, 191, 291, 391 Metal wire 191a, 291a, 91A, 91B, 91C, 91E, 91F (part of metal wire) 191b, 191c Surplus part 92, 192, 292, 392 adjacent layers 93, 93A, 93B, 93C, 93D, 93E, 93F Adhesive part 100, 300 Disc type gas generator 110a R-shaped portion 394 Corner

Claims

1. A non-sintered wire-wound filter formed into a cylindrical body having a mesh in which at least one wire forming a plurality of layers in the radial direction overlaps with another wire, The end portion of the wire in the outermost layer of the plurality of layers is being bonded to at least a portion of a layer adjacent to the outermost layer in a radially inward direction; being drawn inward through one of the axial ends and bonded to at least a portion of the innermost layer; or Adhesion to a portion of either axial end; They are joined by In the wire, A portion other than the portion where the end portions of the wires in the outermost layer are bonded, or a portion of the outermost layer other than a portion to which the end portions of the wires are bonded, and a portion of the outermost layer other than a portion to which at least one of the portions other than the end portions of the wires is bonded to the adjacent layer; is at least the part that is not heat treated, A wire-wound filter, characterized in that the bonding strength of the terminal end is 5N or more.

2. The bonding is by welding, 2. The wire-wound filter according to claim 1, wherein the joint strength of the terminal end is a welding strength.

3. A non-sintered wire-wound filter formed into a cylindrical body having a mesh in which at least one wire forming a plurality of layers in the radial direction overlaps with another wire, a terminal end of the wire in the outermost layer of the plurality of layers is joined by being bonded to a part of a layer (hereinafter referred to as an adjacent layer) adjacent to the outermost layer on the radially inner side, In the wire, A portion other than the portion where the end portions of the wires in the outermost layer are bonded, or a portion of the outermost layer other than a portion to which the end portions of the wires are bonded, and a portion of the outermost layer other than a portion to which at least one of the portions other than the end portions of the wires is bonded to the adjacent layer; is at least the part that is not heat treated, a wire-wound filter, characterized in that the terminal end portion is joined to the adjacent layer at either a region within a length that is within half the distance from a midpoint in the axial direction of the cylindrical body to one end of the cylindrical body in the axial direction, or a region within a length that is within half the distance from a midpoint in the axial direction of the cylindrical body to the other end of the cylindrical body in the axial direction.

4. 4. The wire-wound filter according to claim 1, wherein a corner of at least one of both axial end portions of the cylindrical body is formed into a rounded shape when viewed from the side.

5. 5. The wire-wound filter according to claim 4, wherein the rounded shape is formed by arranging at least two of the wires in parallel.

6. 6. The wire-wound filter according to claim 4, wherein the wires at the end face of the end portion formed in the rounded shape are arranged along a plane that is approximately perpendicular to the axial direction of the cylindrical body.

7. In the case where the wire is not heat-treated in any part other than the part where the end of the wire in the outermost layer is bonded, and in any part other than the end of the wire in the outermost layer and the part where the end of the wire in the outermost layer is bonded to the adjacent layer, the strands in the outermost layer have a curved portion along the adjacent layer, The end portion of the wire in the outermost layer is When the outermost layer is bonded to at least a part of the layer adjacent to the outermost layer in the radial direction, the curved portion is an end portion of the curved portion. When the wire is drawn into the inner surface through one of the axial ends and bonded to at least a part of the innermost layer, the wire is an end portion of the wire extending from the curved portion toward the inner surface, or When the adhesive is attached to a part of one of the axial end portions, the adhesive is attached to the end portion of the wire extending from the curved portion to the axial end portion, 2. The wire-wound filter according to claim 1, wherein at least one portion of the wires in the outermost layer other than the end portions of the wires that is bonded to the adjacent layer is located at one of the curved portions.

8. In the case where the wire is not heat-treated in any part other than the part where the end of the wire in the outermost layer is bonded, and in any part other than the end of the wire in the outermost layer and the part where the end of the wire in the outermost layer is bonded to the adjacent layer, the strands in the outermost layer have a curved portion along the adjacent layer, The end portion of the wire in the outermost layer is When the outermost layer is bonded to at least a portion of an adjacent layer radially inward, the outermost layer is an end portion of the curved portion; 4. The wire-wound filter according to claim 3, wherein at least one portion of the wires in the outermost layer other than the end portions of the wires that is bonded to the adjacent layer is located at one of the curved portions.

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