JP2015157586A - gas generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas generator capable of reducing a manufacturing cost while maintaining high pressure-proof performance.SOLUTION: A gas generator 1A includes a housing in which a gas generation agent 71 is stored and an igniter 50. The igniter 50 is fastened to a bottom plate part of the housing via a resin molded part 40. The bottom plate part is constituted with a first bottom plate member 10 containing a flat plate part 11 and a second bottom plate member 30, and the second bottom plate member 30 contains an annular plate part 33 which is brought into contact with the flat plate part 11, a cylindrical part 32 vertically arranged from an inner periphery of the annular plate part 33 and a shelf plate part 31 extended from an edge part of the cylindrical part 33. The flat plate part 11 has a first opening part 12, and the shelf plate part 31 has a second opening part 34 to which the igniter 50 is inserted and arranged. The resin molded part 40 is provided so as to reach the position on an inner surface of the first bottom plate member 10 from a position on the inner surface of the shelf plate part 31 and close at least the second opening part 34. The inner periphery of the annular plate part 33 is located on the outer side of the first opening part 12 when being viewed along the axial direction.

Description

  The present invention relates to a gas generator incorporated in an occupant protection device, and more particularly to a gas generator incorporated in an airbag device installed in an automobile.

  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 equipped for the purpose of protecting the occupant from the impact generated when the vehicle or the like collides. The airbag is inflated and deployed instantaneously when the vehicle or the like collides, so that the airbag becomes a cushion of the occupant. It is to catch the body.

  The gas generator is incorporated in this airbag device, and ignites the igniter by energization from the control unit at the time of a vehicle collision, etc., and the gas generating agent is burned by the flame generated in the igniter to instantly generate a large amount of gas. This is a device for inflating and deploying the airbag. Note that the airbag device is mounted on, for example, an automobile steering wheel or an instrument panel.

  There are various types of gas generators, and there is a so-called disk-type gas generator as a gas generator suitably used for a driver side airbag device equipped on a steering wheel or the like. In general, a disk-type gas generator has a short cylindrical housing whose end in the axial direction is closed, a gas outlet is provided on the peripheral wall of the housing, and a gas generating agent, an igniter, and a filter are provided inside the housing. Etc. are accommodated.

  The housing of the disk-type gas generator is generally configured by combining a metal member called a lower shell and a metal member called an upper shell. Of these, the lower shell constitutes at least a bottom plate portion of the housing, and an igniter is assembled and fixed to the bottom plate portion.

  Here, various structures have been devised for the assembly structure of the igniter with respect to the lower shell, and one of them is the insertion between the igniter and the lower shell by using insert molding. There has been proposed an assembly structure in which the igniter and the lower shell are integrated through the resin molding portion by forming the resin molding portion so as to fill the space. In the assembly structure, in order to expose the terminal pin of the igniter to the outside of the housing, the lower shell is provided with an opening through which the terminal pin is inserted, and the resin molded portion is closed so as to close the opening. It is common to be provided.

  However, when the assembly structure is adopted, there is a concern that the pressure resistance performance of the outer shell member including the housing, which is covered only by the resin molded portion, may be deteriorated. Become.

  In this respect, for example, in the gas generator disclosed in Japanese Patent Laid-Open No. 4-266548 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2010-173560 (Patent Document 2), the opening is configured to be as small as possible. The lowering of the withstand voltage is suppressed by bending the opening peripheral edge of the lower shell to be covered by the resin molding portion toward the ignition portion side of the igniter.

  On the other hand, for example, in US Patent Application Publication No. 2003/0154876 (Patent Document 3) and JP 2010-228488 (Patent Document 4), a retainer made of a member different from the lower shell is provided in the lower shell. The opening is provided so as to cover the opening, and an opening through which the terminal pin is inserted is provided in the retainer, and a large portion of the retainer is formed as a resin molded portion while forming the opening provided in the retainer as small as possible. By embedding by, suppression of the fall of the proof pressure is aimed at.

JP-A-4-266548 JP 2010-173558 A US Patent Application Publication No. 2003/0154876 JP 2010-228488 A

  However, when the configuration disclosed in Patent Documents 1 and 2 is adopted, there is a problem that a separate process for bending the periphery of the opening of the lower shell is required. Such processing cannot be carried out at low cost when considering that the lower shell is composed of a relatively thick high-tensile steel plate or cold-rolled steel plate in order to ensure high pressure resistance. The manufacturing cost will be greatly reduced.

  On the other hand, when the configurations as disclosed in Patent Documents 3 and 4 are adopted, there is no need for processing for bending the opening periphery of the lower shell, and therefore there is a possibility that the manufacturing can be performed relatively inexpensively. On the other hand, when a retainer having a lower strength than the lower shell is used as the above-described retainer, there still remains a problem that a sufficiently high breakdown voltage cannot be ensured. For this reason, it is necessary to configure the retainer with a member having a relatively high strength. As a result, a considerable amount of cost is required for shape processing of the retainer, and as a result, while maintaining high pressure resistance performance. The manufacturing cost cannot be reduced sufficiently.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gas generator that can sufficiently reduce the manufacturing cost while maintaining high pressure resistance.

  The gas generator according to the present invention includes a housing and an igniter. The housing includes a peripheral wall portion provided with a gas outlet, and a top plate portion and a bottom plate portion that close the axial end portion of the peripheral wall portion, and includes an internal combustion chamber containing a gas generating agent. Have. The igniter is for burning the gas generating agent, and is assembled to the bottom plate portion. The igniter is fixed to the bottom plate portion through a resin molding portion formed by pouring a fluid resin material between the igniter and the bottom plate portion and solidifying the fluid resin material. The bottom plate portion is disposed on a first bottom plate member including a flat plate portion provided with a first opening, and an inner surface located on the combustion chamber side of the flat plate portion so as to cover the first opening, And a second bottom plate member made of a member weaker than the first bottom plate member. The second bottom plate member continuously extends from the inner peripheral edge of the annular plate portion toward the side opposite to the side where the flat plate portion is located, and an annular plate portion that contacts the inner surface of the flat plate portion. A cylindrical portion that is erected and a second opening through which the igniter is inserted and extended continuously from an end opposite to the side where the flat plate portion of the cylindrical portion is located. The shelf board part provided is included. The resin molding portion is configured so that at least the inner wall surface of the second opening portion and the shelf plate portion from the position on the inner surface of the shelf plate portion located on the combustion chamber side so as to close the second opening portion. These surfaces are covered by being provided so as to reach the position on the inner surface of the flat plate portion through the outer surface located on the side opposite to the inner surface and the inner peripheral surface of the cylindrical portion. In the gas generator according to the present invention, when the bottom plate portion is viewed along the axial direction, the inner peripheral edge of the annular plate portion is located outside the first opening.

  In the gas generator according to the present invention, the top plate portion and the peripheral wall portion are constituted by a bottomed cylindrical upper shell, and the first bottom plate member is formed only from the flat plate portion. It is preferable that it is comprised by the lower side shell which becomes.

  In the gas generator according to the present invention, the resin molded portion further refers to the inner surface of the flat plate portion from a position on the inner surface of the flat plate portion through the inner wall surface of the first opening. It is preferable that these surfaces are further covered by being provided so as to reach a position on the outer surface located on the opposite side.

  In the gas generator according to the present invention, the igniter is connected to an ignition unit containing an ignition agent for burning the gas generating agent, and to the ignition unit for igniting the ignition agent. The terminal pin may be included. In that case, it is preferable that the terminal pin is inserted and arranged in the second opening so that the ignition part is located on the combustion chamber side, and in that case, the second opening is It is preferable that the igniter has a size or shape incapable of passing.

  In the gas generator according to the present invention, it is preferable that the resin molding part includes a female connector part capable of receiving a male connector, in which case the female connector part is It is preferable that it is located in the said cylindrical part and the said 2nd opening part so that the space outside the said housing may be faced.

  The gas generator according to the present invention may further include a hollow cylindrical filter housed inside the housing so as to surround the combustion chamber along the radial direction of the peripheral wall portion. Preferably, the filter is in contact with the inner surface of the first bottom plate member. In this case, the second bottom plate member further abuts on the inner peripheral surface of the axial end portion located on the first bottom plate member side of the filter and contacts the inner surface of the first bottom plate member. It is preferable to include an annular shielding portion that covers the gap between the filter and the first bottom plate member by contact, and in this case, the shielding portion is an outer peripheral edge of the annular plate portion. It is preferable that it is provided so as to extend continuously.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the gas generator which can fully reduce manufacturing cost, maintaining a high pressure | voltage resistant performance.

It is the schematic of the gas generator which concerns on Embodiment 1 of this invention. It is an enlarged view of the principal part of the gas generator shown in FIG. It is a partially broken side view of the baseplate part of the housing shown in FIG. It is a bottom view of the bottom plate part of the housing shown in FIG. It is an enlarged view of the principal part of the gas generator which concerns on a comparison form. It is a schematic diagram which shows the reason why the gas generator according to Embodiment 1 of the present invention has higher breakdown voltage than the gas generator according to the comparative embodiment. It is the schematic of the gas generator which concerns on Embodiment 2 of this invention. It is the schematic of the gas generator which concerns on Embodiment 3 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment described below, the present invention is applied to a disk-type gas generator that is suitably incorporated in an airbag device mounted on a steering wheel or the like of an automobile. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic view of a gas generator according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view of a main part of the gas generator shown in FIG. 3 is a partially cutaway side view of the bottom plate portion of the housing shown in FIG. 1, and FIG. 4 is a bottom view of the bottom plate portion of the housing as viewed from the direction of arrow IV shown in FIG. First, with reference to these FIG. 1 thru | or FIG. 4, the structure of 1 A of gas generators which concern on this Embodiment is demonstrated.

  As shown in FIG. 1, the gas generator 1A according to the present embodiment has a short, substantially cylindrical housing that is closed at both ends in the axial direction. In the housing space provided inside the housing, The igniter 50, the cup-shaped member 60, the transfer agent 66, the gas generating agent 71, the lower holding member 72, the upper holding member 73, the cushion material 74, the filter 80, and the like as internal components are accommodated. ing. A combustion chamber 70 in which the gas generating agent 71 among the above-described internal components is mainly housed is located in the housing space provided in the housing.

  The short, substantially cylindrical housing includes a lower shell 10 and an upper shell 20. Each of the lower shell 10 and the upper shell 20 is made of a press-formed product formed by pressing a rolled metal plate member. The outer shell member of the gas generator 1A including the housing includes a fixing member 30 and a resin molded portion 40 in addition to the lower shell 10 and the upper shell 20, which will be described later. I will do it.

  The lower shell 10 corresponds to a first bottom plate member that constitutes a bottom plate portion of the housing, and is formed of a disk-shaped member that includes only a flat plate portion 11 having a first opening 12 at the center. The upper shell 20 is composed of a bottomed cylindrical member having a top plate portion 21 and a peripheral wall portion 22.

  The lower shell 10 is combined and joined to the upper shell 20 so as to close the open end of the upper shell 20. As a result, the lower shell 10 and the upper shell 20 constitute a housing in which the housing space described above is provided, and one end portion in the axial direction of the housing is mainly formed by the lower shell 10. While being blocked by the flat plate portion 11, the other end is closed by the top plate portion 21 of the upper shell 20. For joining the lower shell 10 and the upper shell 20, electron beam welding, laser welding, friction welding, or the like can be suitably used.

  The lower shell 10 is manufactured by pressing (mainly punching and drilling) a metal plate-like member rolled as described above. Specifically, the lower shell 10 is illustrated by pressing a rolled metal plate member from above and below using, for example, a pair of molds including an upper mold and a lower mold. It is manufactured by being molded into the shape as described above. The punching process and the drilling process described above may be performed simultaneously or individually with a time difference.

  As the metal plate-like member constituting the lower shell 10, for example, a metal plate made of stainless steel, steel, aluminum alloy, stainless alloy or the like is used, and preferably a tensile stress of 440 MPa to 780 MPa is applied. In such a case, a high-tensile steel plate (SPFH) or a cold-rolled steel plate (SPCC, SPCD) that does not cause breakage or the like is used. The press working may be performed by hot working or cold working, but is more preferably performed by cold working from the viewpoint of improving dimensional accuracy.

  The upper shell 20 is manufactured by pressing (mainly punching and forging) a metal plate-like member rolled as described above. Specifically, the upper shell 20 is illustrated by pressing a rolled metal plate member from above and below using, for example, a pair of molds including an upper mold and a lower mold. It is manufactured by being molded into the shape as described above. The punching process and the forging process described above may be performed simultaneously or individually with a time difference.

  As the metal plate-like member constituting the upper shell 20, a metal plate made of stainless steel, steel, an aluminum alloy, a stainless alloy, or the like can be used as in the case of the lower shell 10 described above. For this, a high-tensile steel plate (SPFH) or a cold-rolled steel plate (SPCC, SPCD) is used. The forging process may be performed by hot forging or cold forging, but is more preferably performed by cold forging from the viewpoint of improving dimensional accuracy.

  As shown in FIGS. 1 and 2, a fixing member 30 is disposed on the inner surface located on the accommodation space side of the flat plate portion 11 of the lower shell 10 so as to cover the first opening 12. The fixing member 30 corresponds to a second bottom plate member that constitutes a bottom plate portion of the housing, and includes a substantially bottomed cylindrical member including an annular plate portion 31, a cylindrical portion 32, and a shelf plate portion 33.

  As shown in FIGS. 1 to 4, the annular plate portion 31 is a portion that contacts the inner surface of the flat plate portion 11 of the lower shell 10 and has an annular shape. The cylindrical portion 32 is a portion erected so as to continuously extend from the inner peripheral edge of the annular plate portion 31 toward the side opposite to the side where the flat plate portion 11 is located (that is, toward the accommodation space). It has a cylindrical shape. The shelf part 33 is a part provided so as to continuously extend from the end of the tubular part 32 opposite to the side where the flat plate part 11 is located (that is, from the end on the accommodation space side). It has an annular shape having a second opening 34 in the center. Note that a terminal pin 52 of an igniter 50 to be described later is inserted into the second opening 34.

  The fixing member 30 is formed of a press-formed product formed by subjecting a rolled metal plate-like member to sheet metal pressing (mainly punching, drilling and bending). Specifically, the fixing member 30 is formed by pressing a rolled metal plate-shaped member from above and below using, for example, a pair of molds including an upper mold and a lower mold, as shown in the figure. It is manufactured by molding into the shape of The punching, drilling and bending described above may be performed simultaneously or individually with a time difference.

  As the metal plate-like member constituting the fixing member 30, a metal plate made of stainless steel, steel, aluminum alloy, stainless alloy, or the like can be used. Preferably, cold rolled steel plates (SPCC, SPCD) are used. Used. Here, the fixing member 30 can be constituted by a metal plate-like member that can be subjected to sheet metal press processing relatively easily, and thus can be constituted by a member that is weaker than the lower shell 10. is there. Therefore, the metal plate-like member constituting the fixing member 30 is sufficiently thinner than the metal plate-like member constituting the lower shell 10, and the thickness after molding is lower than the lower shell 10. The thickness of the flat plate portion 11 is sufficiently thinner.

  Here, in the gas generator 1A according to the present embodiment, when viewed along the axial direction of the housing, the inner periphery of the annular plate portion 31 of the fixing member 30 (that is, the annular plate portion 31 and the cylindrical portion). The inner edge of the fixing member 30 at the boundary portion 32 is configured to be located outside the first opening 12 provided in the flat plate portion 11 of the lower shell 10. In other words, in the gas generator 1A according to the present embodiment, the first opening 12 provided in the flat plate portion 11 has a perfect circle shape, and the inner peripheral edge of the annular plate portion 31 is a perfect circle. Since the first opening 12 has a diameter of R1 and the inner diameter of the annular plate portion 31 (that is, the inner diameter of the cylindrical portion 32) is R2, these satisfy the condition of R1 <R2. Satisfies.

  With this configuration, high pressure resistance can be obtained even when the fixing member 30 is formed of a member that is more fragile than the lower shell 10, and details thereof will be described later.

  On the other hand, the size of the second opening 34 provided in the shelf plate portion 33 of the fixing member 30 is not particularly limited, but is configured to be sufficiently small in order to obtain high pressure resistance. Is preferred. Specifically, the size of the second opening 34 is configured to be as small as possible within a range in which sufficient insulation can be secured between the terminal pin 52 of the igniter 50 inserted through the second opening 34. It is preferable that

  In particular, as shown in the drawing, the second opening 34 has such a size and shape that an igniter 51 of an igniter 50 described later cannot pass through, so that an unexpected breakage may occur in the resin molded portion 40 described later. Even if it occurs, it is possible to prevent the igniter 50 from passing through the second opening 34 and jumping out of the housing due to an increase in pressure inside the housing. Operation is ensured.

  As shown in FIG. 1 and FIG. 2, the resin molding portion 40 is formed by injection molding (more specifically, insert molding) using a mold, and is a shelf so as to close the second opening 34. A position on the outer surface of the flat plate portion 11 (ie, a surface facing the outside of the housing of the flat plate portion 11) from a position on the inner surface of the plate portion 33 (that is, a position on the surface located on the accommodation space side of the shelf plate portion 33). It is formed by adhering an insulating fluid resin material to the fixing member 30 and the lower shell 10 so as to reach a position on the surface to be solidified.

  More specifically, the resin molding portion 40 is arranged from the position on the inner surface of the shelf plate portion 33 to the inner wall surface of the second opening 34 provided in the shelf plate portion 33, the outer surface of the shelf plate portion 33, and the cylindrical shape. It reaches the position on the outer surface of the flat plate portion 11 via the inner peripheral surface of the portion 32, the inner surface of the flat plate portion 11, and the inner wall surface of the first opening 12 provided in the flat plate portion 11. The insulating fluid resin material is attached so as to cover these surfaces, and is solidified.

  Here, the igniter 50 is accommodated after assembly so that the terminal pin 52 is inserted into the second opening 34 provided in the shelf plate portion 33 of the fixing member 30 when the resin molding portion 40 is molded. In this state, the fluid resin material described above is poured so as to fill the space between the igniter 50, the fixing member 30, and the lower shell 10. Thus, the fixing member 30 and the lower shell 10 are fixed via the resin molding portion 40.

  At this time, the fixing member 30 is previously positioned and placed at a position on the inner surface of the lower shell 10, and then the resin molding portion 40 is formed, so that the lower shell 10 and the fixing member 30 are also formed. These are fixed to each other.

  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.

  The resin molding portion 40 includes an inner covering portion 41 that covers a part of the inner surface of the shelf plate portion 33 of the fixing member 30, an outer surface of the shelf plate portion 33 of the fixing member 30, and an inner portion of the cylindrical portion 32 of the fixing member 30. A first outer covering portion 42 covering a part of the peripheral surface and the inner surface of the flat plate portion 11 of the lower shell 10; a second outer covering portion 43 covering a part of the outer surface of the flat plate portion 11 of the lower shell 10; The inner covering portion 41 and the first outer covering portion 42 are positioned in the second opening portion 34 so as to cover the inner wall surface of the second opening portion 34 provided in the shelf plate portion 33 of the fixing member 30. The first outer cover is located in the first opening portion 12 so as to cover the first connecting portion 44 that is continuous with the inner wall surface of the first opening portion 12 provided in the flat plate portion 11 of the lower shell 10. A second connecting portion 45 that is continuous with the portion 42 and the second outer covering portion 43 is provided.

  The resin molding portion 40 is fixed to the fixing member 30 on the surfaces of the inner covering portion 41, the first outer covering portion 42, and the first connecting portion 44 on the fixing member 30 side. In addition, the resin molding portion 40 is fixed to the lower shell 10 on the surface of the first outer covering portion 42, the second outer covering portion 43, and the second connecting portion 45 on the lower shell 10 side. Further, the resin molding portion 40 is fixed to a side surface and a lower surface of the portion near the lower end of the ignition portion 51 of the igniter 50, which will be described later, and a surface of a portion near the upper end of the terminal pin 52 of the igniter 50. Yes. As a result, the second opening 34 is completely embedded by the terminal pin 52 and the resin molding portion 40, and the airtightness of the space inside the housing is ensured by ensuring the sealing performance at that portion. ing.

  The inner covering portion 41 of the resin molding portion 40 is provided so as to cover only the inner surface of the shelf plate portion 33 of the fixing member 30, whereby the outer peripheral surface of the cylindrical portion 32 of the fixing member 30 is made of resin. It is in a state of being exposed without being covered by the molding portion 40.

  A female connector portion 46 is formed in the resin molding portion 40 so as to face a space outside the housing. The female connector portion 46 is a part for receiving a male connector (not shown) of a harness for connecting the igniter 50 and a control unit (not shown), and is a first opening of the lower shell 10. It is located in the part 12 and in the cylindrical part 32 of the fixing member 30. In the female connector portion 46, a portion near the lower end of the terminal pin 52 of the igniter 50 is disposed so as to be exposed. A male connector is inserted into the female connector portion 46, thereby realizing electrical conduction between the harness core wire and the terminal pin 52.

  Here, as shown in FIG. 4, the 2nd opening part 34 provided in the shelf part 33 of the fixing member 30 is preferably formed in an ellipse shape. By configuring in this way, it is possible to prevent the resin molding portion 40 from rotating relative to the fixing member 30 and the lower shell 10 after injection molding. From the viewpoint of preventing the rotation, the shape of the second opening 34 is not limited to the above-described elliptical shape, and may be any shape as long as it is an asymmetrical shape such as an oval shape or a polygonal shape. . Furthermore, unevenness (for example, a convex part, a recessed part, a dent, etc.) is previously provided in the fixing member 30 and the lower shell 10 of the part to be covered by the resin molding part 40, and this is covered by the resin molding part 40. Thus, the above-described rotation may be prevented.

  In addition, an adhesive layer is provided in advance at a predetermined position on the surface of the fixing member 30 and / or the lower shell 10 of the portion to be covered by the resin molding portion 40, and the above-described injection molding is performed using the adhesive layer. It is good. The adhesive layer can be formed by applying an adhesive in advance to the predetermined position of the fixing member 30 and / or the lower shell 10 and curing it.

  In this way, since the cured adhesive layer is positioned between the fixing member 30 and / or the lower shell 10 and the resin molding portion 40, the resin molding portion 40 is more firmly fixed. It becomes possible to fix to the lower shell 10. Therefore, it is possible to prevent the resin molding portion 40 from rotating relative to the fixing member 30 and the lower shell 10 after injection molding. Further, if the adhesive layer is provided annularly along the circumferential direction so as to surround the second opening 34 provided in the shelf 33 of the fixing member 30, higher sealing performance is ensured at the portion. It is also possible to do.

  Here, as the adhesive applied in advance to the fixing member 30 and / or the lower shell 10, an adhesive containing a resin material having excellent heat resistance, durability, corrosion resistance, etc. as a raw material after curing is suitably used. For example, those containing a cyanoacrylate resin or a silicone resin as a raw material are particularly preferably used. In addition to the above resin materials, phenolic resins, epoxy resins, melamine resins, urea resins, polyester resins, alkyd resins, polyurethane resins, polyimide resins, polyethylene resins, polypropylene resins, Polyvinyl chloride resin, polystyrene resin, polyvinyl acetate resin, polytetrafluoroethylene resin, acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, acrylic resin, polyamide resin, polyacetal resin, polycarbonate resin, Polyphenylene ether resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyolefin resin, polyphenylene sulfide resin, polysulfone resin, polyether sulfone resin, polyester Arylate resins, polyether ether ketone resin, polyamide-imide resin, liquid crystal polymer, styrene rubber, those containing olefin rubbers such as is available as an adhesive as described above.

  In addition, as the igniter 50, when a squib cup and a base part constituting the ignition part 51 described later are used which are made of a metal member, the part to be covered by the resin molding part 40 is used. An adhesive layer may be provided by previously applying an adhesive to a predetermined position on the surface of the igniter 50. If comprised in this way, it will become possible to fix the igniter 50 firmly by the resin molding part 40 similarly to the case where the adhesive layer is previously provided in the fixing member 30 and / or the lower shell 10 described above. Thus, it becomes possible to ensure higher sealing performance in the portion.

  Further, in the present embodiment, when the resin molding portion 40 is molded, the case where the resin molding portion 40 is configured to be integrated with the igniter 50, the fixing member 30, and the lower shell 10 is illustrated. When molding the molding unit 40, the resin molding unit 40 is integrated only with the fixing member 30 and the lower shell 10, and the igniter 50 is assembled to the molded resin molding unit 40 by, for example, fitting. You may comprise as follows. In that case, since the resin molding portion 40 is fixed only to the fixing member 30 and the lower shell 10, the sealing performance between the resin molding portion 40 and the igniter 50 cannot be secured only by this. However, if an appropriate sealing process is performed, such as placing an O-ring in the part, sufficient sealing performance can be ensured.

  As shown in FIGS. 1 and 2, the igniter 50 is for generating a flame, and includes the above-described ignition unit 51 and the above-described pair of terminal pins 52. The ignition unit 51 includes therein an igniting agent that generates a flame by igniting and burning during operation, and a resistor for igniting the igniting agent. The pair of terminal pins 52 are connected to the ignition unit 51 in order to ignite the igniting agent.

  More specifically, the ignition unit 51 includes a squib cup formed in a cup shape, and a base portion that closes the opening end of the squib cup and through which the pair of terminal pins 52 are inserted and held, A resistor (bridge wire) is attached so as to connect the tips of the pair of terminal pins 52 inserted into the squib cup, and a dot is placed in the squib cup so as to surround the resistor or close to the resistor. It has a configuration loaded with explosives.

  Here, 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 igniting agent. The squib cup and the base portion described above are generally made of metal or plastic.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 52. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition agent starts burning. The high temperature flame generated by the combustion ruptures the squib cup containing the igniting agent. The time from when the current flows through the resistor until the igniter 50 is activated is generally 2 milliseconds or less when a nichrome wire is used as the resistor.

  As shown in FIG. 1, a cup-shaped member 60 is assembled on the fixing member 30 so as to cover the fixing member 30, the resin molding portion 40, and the igniter 50. The cup-shaped member 60 has a substantially bottomed cylindrical shape with an open end on the fixing member 30 side, and includes a fire transfer chamber 65 in which a charge transfer agent 66 is accommodated. The cup-shaped member 60 projects toward the combustion chamber 70 in which the gas generating agent 71 is accommodated so that the heat transfer chamber 65 provided therein faces the ignition part 51 of the igniter 50. It is arranged to be located.

  The cup-shaped member 60 includes a top wall portion 61 and a side wall portion 62 that define the above-described heat transfer chamber 65, and an extending portion 63 that extends radially outward from a portion of the side wall portion 62 on the opening end side. have. The extending portion 63 is formed so as to extend along the inner surfaces of the shelf plate portion 33, the cylindrical portion 32, and the annular plate portion 31 of the fixing member 30, and extends in a flange shape at a radially outer portion thereof. A distal end portion 64 is included.

  The distal end portion 64 of the extending portion 63 is disposed between the annular plate portion 31 of the fixing member 30 and the lower holding member 72 along the axial direction of the housing, thereby annularly extending along the axial direction of the housing. It is sandwiched between the plate portion 31 and the lower holding member 72. Here, the lower holding member 72 is directed toward the lower shell 10 by the gas generating agent 71, the cushion material 74, the upper holding member 73, and the top plate portion 21 of the upper shell 20 disposed above the lower holding member 72. Since the cup-shaped member 60 is in the pressed state, the distal end portion 64 of the extending portion 63 is pressed toward the lower shell 10 side by the lower holding member 72, and the annular plate of the fixing member 30. It is fixed to the flat plate part 11 of the lower shell 10 via the part 31.

  In addition, while the part by the side of the opening end of the side wall part 62 of the cup-shaped member 60 is externally inserted by the inner coating | coated part 41 of the resin molding part 40, while being press-fitted and fixed with respect to the said resin molding part 40, cup shape A part of the extending portion 63 of the member 60 is press-fitted into the tubular portion 32 by being extrapolated to the tubular portion 32 of the fixing member 30. The press-fit fixing is a fixing portion for facilitating the assembly work when the cup-shaped member 60 is assembled to the housing, but the cup-shaped member 60 is also fixed by the press-fit fixing. Will be.

  Further, in the present embodiment, the top wall portion 61 of the cup-shaped member 60 is bent into a curved shape and is configured so as to contact the top plate portion 21 of the upper shell 20. The cup-shaped member 60 is also fixed depending on the configuration.

  The cup-shaped member 60 does not have an opening in any of the top wall portion 61 and the side wall portion 62 and surrounds the heat transfer chamber 65 provided therein. The cup-shaped member 60 is ruptured or melted with the increase in pressure in the transfer chamber 65 or conduction of generated heat when the transfer powder 66 is ignited by the operation of the igniter 50. A material having a relatively low mechanical strength is used.

  Therefore, as the cup-shaped member 60, a metal member such as aluminum or an aluminum alloy, a thermosetting resin represented by an epoxy resin, a polybutylene terephthalate resin, a polyethylene terephthalate resin, a polyamide resin (for example, nylon 6 or nylon) 66), and those made of a resin member such as a thermoplastic resin typified by polypropylene sulfide resin, polypropylene oxide resin and the like are preferably used.

  In addition to the above, the cup-shaped member 60 is made of a metal member having high mechanical strength such as iron or copper, and has an opening in the side wall portion 62. It is also possible to use one having a seal tape attached so as to close the opening.

The charge transfer agent 66 filled in the transfer chamber 65 is ignited by the flame generated by the operation of the igniter 50 and burns to generate hot particles. The charge transfer agent 66 must be capable of reliably starting the combustion of the gas generating agent 71, and is generally composed of a metal powder / oxidant represented by B / KNO ₃ or the like. Things are used. As the charge transfer agent 66, a powdery one, a one formed into a predetermined shape by a binder, or the like is used. Examples of the shape of the charge transfer agent 66 formed 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 combustion chamber 70 in which the gas generating agent 71 is accommodated is located in the space surrounding the portion where the cup-shaped member 60 described above is disposed in the space inside the housing. Specifically, as described above, the cup-shaped member 60 is disposed so as to protrude into the combustion chamber 70 formed inside the housing, and faces the outer surface of the side wall portion 62 of the cup-shaped member 60. A space provided in the portion is configured as a combustion chamber 70.

  Further, in the combustion chamber 70, a filter 80 is disposed along the inner periphery of the housing in a space surrounding the space in which the gas generating agent 71 is accommodated in the radial direction of the housing. The filter 80 has a cylindrical shape, and is arranged such that its central axis substantially matches the axial direction of the housing.

  The gas generating agent 71 is a chemical that is ignited by the hot particles generated by the operation of the igniter 50 and burns to generate gas. As the gas generating agent 71, it is preferable to use a non-azide-based gas generating agent. Generally, the gas generating agent 71 is formed as a molded body containing a fuel, an oxidizing agent, 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. The oxidizing agent is selected from basic nitrates such as basic copper nitrate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, alkaline earth metals, transition metals, and ammonia. Nitrate containing cation 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, an organic binder such as a metal salt of carboxymethyl cellulose or a stearate, or an inorganic binder such as synthetic hydroxytalcite or acidic 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 71 includes various shapes such as a granular shape, a pellet shape, a granular shape such as a cylindrical shape, and a disk shape. In addition, in the cylindrical shape, a porous (for example, a single-hole cylindrical shape or a porous cylindrical shape) having a through 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 gas generator 1A is incorporated. For example, a shape in which the gas generation rate changes with time during combustion of the gas generating agent 71 is selected. It is preferable to select an optimal shape according to the specifications. In addition to the shape of the gas generating agent 71, 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, and the like of the gas generating agent 71.

  The filter 80 is, for example, one obtained by winding and sintering a metal wire such as stainless steel or steel, one obtained by pressing a net material knitted with a metal wire, or by winding a perforated metal plate. Things are used. Here, as the net material, specifically, a knit metal mesh, a plain weave metal mesh, an assembly of crimped metal wires, or the like is used. In addition, as a perforated metal plate, for example, expanded metal that has been cut into a zigzag pattern on the metal plate and expanded to form a hole and processed into a mesh shape, or a hole is formed in the metal plate and at that time A hook metal or the like obtained by flattening the burr generated at the periphery of the hole is used. In this case, the size and shape of the hole to be formed can be appropriately changed as necessary, and holes of different sizes and shapes may be included on the same metal plate. In addition, as a metal plate, a steel plate (mild steel), a stainless steel plate, for example can be used suitably, and nonferrous metal plates, such as aluminum, copper, titanium, nickel, or these alloys, can also be utilized.

  When the gas generated in the combustion chamber 70 passes through the filter 80, the filter 80 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. Therefore, in order to sufficiently cool the gas and prevent the residue from being discharged to the outside, it is necessary to ensure that the gas generated in the combustion chamber 70 passes through the filter 80. The filter 80 is disposed away from the peripheral wall portion 22 so that a gap 25 having a predetermined size is formed between the filter 80 and the peripheral wall portion 22 of the upper shell 20 that forms the peripheral wall of the housing. Has been.

  A plurality of gas outlets 23 are provided in the peripheral wall portion 22 of the upper shell 20 at a portion facing the filter 80. The gas outlet 23 is for leading the gas that has passed through the filter 80 to the outside of the housing. A seal tape 24 is affixed to a main surface located on the filter 80 side of the peripheral wall portion 22 of the upper shell 20 so as to close the gas outlet 23. As this sealing tape 24, an aluminum foil or the like having an adhesive member applied on one side is used. Thereby, the airtightness of the combustion chamber 70 is ensured.

  A lower holding member 72 is disposed in the combustion chamber 70 in the vicinity of the end portion of the lower shell 10 located on the flat plate portion 11 side. The lower holding member 72 has an annular shape and is disposed so as to cover the boundary portion between the filter 80 and the flat plate portion 11. Further, the cup-shaped member 60 is held by sandwiching the distal end portion 64 of the cup-shaped member 60 with the flat plate portion 11.

  When the lower holding member 72 is in operation, the gas generated in the combustion chamber 70 flows out of the gap between the lower end of the filter 80 and the flat plate portion 11 without passing through the inside of the filter 80. To prevent. The lower holding member 72 is formed by, for example, pressing a metal plate-like member, and preferably a steel plate such as ordinary steel or special steel (for example, a cold-rolled steel plate or a stainless steel plate). ).

  An upper holding member 73 is disposed at the end of the combustion chamber 70 located on the top plate 21 side of the upper shell 20. The upper holding member 73 has a substantially disc shape, and is disposed so as to cover the boundary portion between the filter 80 and the top plate portion 21. Further, the upper holding member 73 holds a cushion material 74 disposed therein.

  When the upper holding member 73 is operated, the gas generated in the combustion chamber 70 flows out of the gap between the upper end of the filter 80 and the top plate portion 21 without passing through the inside of the filter 80. To prevent. Similarly to the lower holding member 72, the upper holding member 73 is formed by, for example, pressing a metal plate-like member, and is preferably a steel plate such as ordinary steel or special steel (for example, Cold rolled steel plate, stainless steel plate, etc.).

  An annular cushion material 74 is disposed inside the upper holding member 73 so as to be in contact with the gas generating agent 71. Accordingly, the cushion material 74 is positioned between the top plate portion 21 and the gas generating agent 71 in the portion of the combustion chamber 70 on the top plate portion 21 side, and the gas generating agent 71 is placed on the flat plate of the lower shell 10. It is pressing toward the part 11 side. The cushion material 74 is provided for the purpose of preventing the gas generating agent 71 made of a molded body from being crushed by vibration or the like, and is preferably a ceramic fiber molded body, rock wool, foamed resin (for example, (Such as foamed silicone, foamed polypropylene, foamed polyethylene, etc.), chloroprene, and a member made of rubber typified by EPDM.

  Next, the operation of the gas generator 1A according to the present embodiment described above will be described with reference to FIG.

  When a vehicle on which the gas generator 1A according to the present embodiment is mounted collides, a collision is detected by a collision detection unit provided separately in the vehicle, and based on this, from a control unit provided separately in the vehicle The igniter 50 is activated by energization of. The transfer charge 66 accommodated in the transfer chamber 65 is ignited and burned by the flame generated by the operation of the igniter 50, and generates a large amount of heat particles. The cup-shaped member 60 is ruptured or melted by the combustion of the charge transfer agent 66, and the above-described hot particles flow into the combustion chamber 70.

  The gas generating agent 71 accommodated in the combustion chamber 70 is ignited and burned by the flowing heat particles, and a large amount of gas is generated. The gas generated in the combustion chamber 70 passes through the inside of the filter 80, and at that time, heat is taken away by the filter 80 and cooled, and slag contained in the gas is removed by the filter 80, and the combustion chamber 70. It flows into the gap 25 located at the outer peripheral edge portion.

  As the internal pressure of the housing increases, the sealing by the sealing tape 24 that has closed the gas outlet 23 of the upper shell 20 is broken, and gas is jetted out of the housing through the gas outlet 23. The jetted gas is introduced into an airbag provided adjacent to the gas generator 1A, and the airbag is inflated and deployed.

  Here, in the gas generator 1A according to the present embodiment, as described above, the inner periphery of the annular plate portion 31 of the fixing member 30 is the first opening portion provided in the flat plate portion 11 of the lower shell 10. 12, the diameter R <b> 1 of the first opening 12 and the inner diameter R <b> 2 of the annular plate portion 31 satisfy the condition of R <b> 1 <R <b> 2. The reason why a high pressure resistance performance can be obtained even when the fixing member 30 is configured by a member more fragile than the lower shell 10 by configuring in this manner will be described.

  FIG. 5 is an enlarged view of the main part of the gas generator according to the comparative embodiment, and FIG. 6 shows the reason why the gas generator according to the present embodiment has a higher breakdown voltage than the gas generator according to the comparative embodiment. It is a schematic diagram shown.

  First, the gas generator 1X which concerns on a comparison form is demonstrated with reference to FIG. As shown in FIG. 5, in the gas generator 1 </ b> X according to the comparative embodiment, the inner peripheral edge of the annular plate portion 31 of the fixing member 30 overlaps the first opening portion 12 provided in the flat plate portion 11 of the lower shell 10. The diameter R1 of the first opening portion 12 and the inner diameter R2 of the annular plate portion 31 satisfy the condition of R1 = R2 so that the first opening portion 12 is positioned. It has the same configuration as the gas generator 1A according to the embodiment.

  6 (A) to 6 (C) show the shape change with time in the vicinity of the igniter 50 when the pressure inside the housing is gradually increased in the gas generator 1A according to the present embodiment. ing. Here, FIG. 6 (A) shows a state at the start of the pressure increase, and FIG. 6 (B) shows a state after a predetermined time has elapsed from the start of the pressure increase. FIG. 6C shows a state after a predetermined time has elapsed from the state shown in FIG.

  On the other hand, FIGS. 6 (D) and 6 (E) show the shape change with time in the vicinity of the igniter 50 when the pressure inside the housing is gradually increased in the gas generator 1X according to the comparative embodiment. ing. Here, FIG. 6 (D) shows a state at the start of the pressure increase, and FIG. 6 (E) shows a state after a predetermined time has elapsed from the start of the pressure increase.

  It should be noted that in the gas generator 1A according to the present embodiment, the elapsed time from the state shown in FIG. 6A to the state shown in FIG. In the gas generator 1X, the elapsed time from the state shown in FIG. 6D to the state shown in FIG. 6E and the pressure increase rate at that time are the same.

  As shown in FIGS. 6 (A) to 6 (E), as the pressure inside the housing increases, the lower shell 10 constituting a part of the housing faces outward as shown in the figure. Changes in shape.

  Here, in the state shown in FIG. 6B and FIG. 6E after a predetermined time has elapsed, a predetermined amount of the same shape change occurs in the lower shell 10 and the fixing member 30 However, a considerable degree of shape change is brought about.

  At this time, as shown in FIG. 6B, the gas generator 1A according to the present embodiment in which the diameter R1 of the first opening 12 and the inner diameter R2 of the annular plate portion 31 satisfy the condition of R1 <R2. , The inner peripheral edge of the annular plate portion 31 does not reach the inner side of the first opening portion 12 by a margin based on the dimensional difference between the R1 and R2, and the inner peripheral edge of the annular plate portion 31 still remains. There is a state covered with the flat plate portion 11 of the lower shell 10, and the internal pressure can be maintained without breaking the fixing member 30.

  On the other hand, as shown in FIG. 6E, in the gas generator 1X according to the comparative embodiment in which the diameter R1 of the first opening 12 and the inner diameter R2 of the annular plate portion 31 satisfy the condition of R1 = R2, Since there is no margin based on the dimensional difference between the diameter R1 and the inner diameter R2, the inner peripheral edge of the annular plate portion 31 reaches the inner side of the first opening 12, and the inner peripheral edge of the annular plate portion 31 is located. The fixing member 30 is broken at the portion P shown in the figure, and the internal space of the housing and the external space are communicated with each other through the portion, so that the internal pressure cannot be maintained. .

  On the other hand, in the gas generator 1A according to the present embodiment, the inner peripheral edge of the annular plate portion 31 is the first opening 12 when the state shown in FIG. The fixing member 30 is broken at a portion where the inner peripheral edge of the annular plate portion 31 is located (portion P shown in the drawing), and the space inside the housing and the space outside the housing are interposed via the portion. As a result, the internal pressure cannot be maintained.

  Thus, in the gas generator 1A according to the present embodiment, the diameter R1 of the first opening 12 and the inner diameter R2 of the annular plate portion 31 are compared with the gas generator 1X according to the comparative embodiment. The breaking pressure at which the housing breaks is increased by a margin based on the dimensional difference, and high pressure resistance is obtained even when the fixing member 30 is made of a member weaker than the lower shell 10. Can do.

  Here, in the gas generator 1A according to the present embodiment, the housing as described above is broken rather than the maximum value of the internal pressure of the housing that rises when the gas generating agent 71 burns during the operation. By setting the breaking pressure to be generated sufficiently high, the design is made so that the fixing member 30 is not damaged during actual operation.

  As described above, by using the gas generator 1A according to the present embodiment, high pressure resistance can be obtained even when the fixing member 30 is configured with a member weaker than the lower shell 10. Therefore, a member that is very inexpensive and easy to process can be used as the fixing member 30. Therefore, not only complicated shape processing such as bending the periphery of the first opening 12 provided in the lower shell 10 is not required, but it is not necessary to use an expensive member as the fixing member 30, so that high pressure resistance performance is achieved. It is possible to sufficiently reduce the manufacturing cost while maintaining the above.

  In the case of the gas generator 1A according to the present embodiment, as described above, when the internal pressure of the housing reaches the above destructive pressure that is much higher than that during normal operation, Since this can be determined in the part P, even if an unexpected abnormal increase in internal pressure occurs, it is possible to control the operation at that time, which is further superior in terms of safety. It can also be.

(Embodiment 2)
FIG. 7 is a schematic diagram of a gas generator according to Embodiment 2 of the present invention. Hereinafter, the gas generator 1B according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 7, the gas generator 1 </ b> B according to the present embodiment does not include the lower holding member 72 when compared with the gas generator 1 </ b> A according to the first embodiment described above. The configuration is different in that the fixing member 30 has a shielding portion 35.

  Specifically, in the gas generator 1B according to the present embodiment, the fixing member 30 has an outer peripheral edge of the annular plate portion 31 in addition to the annular plate portion 31, the cylindrical portion 32, and the shelf plate portion 33 described above. The shield part 35 provided so that it may extend continuously may be provided. Here, the size of the annular plate portion 31 is also different from that in the first embodiment, and the flat plate portion 11 of the lower shell 10 at the portion facing the portion where the gas generating agent 71 is accommodated is almost completely or completely. It is the size which covers.

  Here, the shielding portion 35 has an annular shape so as to contact the inner peripheral surface of the axial end portion located on the flat plate portion 11 side of the filter 80 and the inner surface of the flat plate portion 11. Thereby, the gap between the filter 80 and the flat plate portion 11 is covered by the shielding portion 35. The shielding portion 35 prevents gas generated in the combustion chamber 70 from flowing out of the gap between the lower end of the filter 80 and the flat plate portion 11 without passing through the inside of the filter 80 during operation. To do.

  The configuration and shape of the fixing member 30 other than the above-described portions are the same as those in the above-described first embodiment, and therefore the inner peripheral edge of the annular plate portion 31 of the fixing member 30 is the flat plate portion of the lower shell 10. This is also the same in that it is configured to be located outside the first opening 12 provided in 11.

  In such a configuration, in addition to the effects described in the first embodiment, it is possible to reduce the number of parts by eliminating the need to separately provide the lower holding member 72, and accordingly, the parts cost is reduced. It is also possible to obtain an effect that the reduction of the amount and the assembling work can be facilitated.

(Embodiment 3)
FIG. 8 is a schematic diagram of a gas generator according to Embodiment 3 of the present invention. Hereinafter, the gas generator 1C according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 8, the gas generator 1 </ b> C according to the present embodiment has a lower shell 10 and an upper shell 20 that constitute a housing when compared with the gas generator 1 </ b> A according to the first embodiment described above. The configuration is different.

  Specifically, in the gas generator 1 </ b> C according to the present embodiment, the lower shell 10 and the upper shell 20 are each formed in a substantially cylindrical shape with a bottom so that these opening surfaces face each other. The housing is configured by being joined together. That is, the lower shell 10 includes not only the flat plate portion 11 provided with the first opening 12 but also the peripheral wall portion 13 erected from the outer peripheral edge of the flat plate portion 11.

  The lower shell 10 is manufactured by pressing (mainly punching, drilling and forging) a rolled metal plate-like member. Specifically, the lower shell 10 is illustrated by pressing a rolled metal plate member from above and below using, for example, a pair of molds including an upper mold and a lower mold. It is manufactured by being molded into the shape as described above. The punching process, the drilling process, and the forging process described above may be performed at the same time or may be performed individually with a time difference.

  As the metal plate-like member constituting the lower shell 10, for example, a metal plate made of stainless steel, steel, aluminum alloy, stainless alloy or the like is used, and preferably a tensile stress of 440 MPa to 780 MPa is applied. In such a case, a high-tensile steel plate (SPFH) or a cold-rolled steel plate (SPCC, SPCD) that does not cause breakage or the like is used. The forging process may be performed by hot forging or cold forging, but is more preferably performed by cold forging from the viewpoint of improving dimensional accuracy.

  Here, the configuration and the shape of the fixing member 30 provided in the gas generator 1C according to the present embodiment are the same as those in the first embodiment described above, and therefore, the inside of the annular plate portion 31 of the fixing member 30 is the same. The same is true in that the peripheral edge is configured to be located outside the first opening 12 provided in the flat plate portion 11 of the lower shell 10.

  When configured in this manner, the manufacturing cost is increased by the amount of forming the peripheral wall portion 13 in the lower shell 10 as compared with the gas generator 1A according to the first embodiment described above. This eliminates the need for complicated shape processing such as bending the peripheral edge of the first opening 12 provided in the apparatus 10, and thus the manufacturing cost can be sufficiently reduced in this respect.

  In the first to third embodiments of the present invention described above, the inner peripheral edge of the annular plate portion 31 of the fixing member 30 is located outside the first opening portion 12 provided in the flat plate portion 11 of the lower shell 10. The case where the diameter R1 of the first opening 12 and the inner diameter R2 of the annular plate portion 31 are configured so as to satisfy the condition of R1 <R2 is illustrated. The shape of the inner peripheral edge of the plate portion 31 does not necessarily have to be a perfect circle, and these may be configured in other shapes such as an ellipse or a polygon. However, even in that case, it is necessary that the inner peripheral edge of the annular plate portion 31 is positioned outside the first opening 12 along the axial direction of the housing.

  In the first to third embodiments of the present invention described above, the case where the cylindrical portion 32 of the fixing member 30 is configured to be cylindrical has been described as an example. You may be comprised in other shapes, such as column shape.

  Moreover, in Embodiment 1 thru | or 3 of this invention mentioned above, the resin molding part 40 is changed from the position on the inner surface of the shelf board part 33 to the shelf board part 33 so that the 2nd opening part 34 may be obstruct | occluded. The inner wall surface of the provided second opening portion 34, the outer surface of the shelf plate portion 33, the inner peripheral surface of the tubular portion 32, the inner surface of the flat plate portion 11, and the first opening portion 12 provided in the flat plate portion 11. The case where it is provided so as to reach the position on the outer surface of the flat plate portion 11 through the inner wall surface of the flat plate portion 11 has been described as an example, but the resin molded portion 40 closes the second opening portion 34. As described above, at least from the position on the inner surface of the shelf portion 33, through the inner wall surface of the second opening 34, the outer surface of the shelf portion 33, and the inner peripheral surface of the cylindrical portion 32, the flat plate portion 11 may be provided so as to reach the position on the inner surface.

  Furthermore, in Embodiments 1 to 3 of the present invention described above, the case where the present invention is applied to a so-called disk-type gas generator has been described as an example, but the scope of application of the present invention is limited to this. It is not something.

  In addition, the above-described characteristic configurations of the gas generators according to the first to third embodiments of the present invention can naturally be combined with each other within an allowable range in terms of the device configuration.

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

  DESCRIPTION OF SYMBOLS 1A-1C Gas generator, 10 Lower side shell, 11 Flat plate part, 12 1st opening part, 13 Peripheral wall part, 20 Upper side shell, 21 Top plate part, 22 Peripheral wall part, 23 Gas outlet, 24 Seal tape, 25 Gap, 30 fixing member, 31 annular plate portion, 32 cylindrical portion, 33 shelf plate portion, 34 second opening portion, 35 shielding portion, 40 resin molding portion, 41 inner covering portion, 42 first outer covering portion, 43 first 2 External covering portion, 44 First connecting portion, 45 Second connecting portion, 46 Female connector portion, 50 Igniter, 51 Ignition portion, 52 Terminal pin, 60 Cup-shaped member, 61 Top wall portion, 62 Side wall portion, 63 Extension part, 64 tip part, 65 transfer chamber, 66 transfer agent, 70 combustion chamber, 71 gas generating agent, 72 lower holding member, 73 upper holding member, 74 cushion material, 80 filter.

Claims (6)

A housing having a combustion chamber in which a gas generating agent is contained, including a peripheral wall portion provided with a gas outlet, and a top plate portion and a bottom plate portion closing an axial end portion of the peripheral wall portion;
An igniter that is assembled to the bottom plate portion and burns the gas generating agent;
The igniter is fixed to the bottom plate part via a resin molding part formed by pouring a fluid resin material between the igniter and the bottom plate part and solidifying it.
The bottom plate portion is disposed on a first bottom plate member including a flat plate portion provided with a first opening, and an inner surface located on the combustion chamber side of the flat plate portion so as to cover the first opening, A second bottom plate member made of a member weaker than the first bottom plate member,
The second bottom plate member continuously extends from the inner peripheral edge of the annular plate portion toward the side opposite to the side where the flat plate portion is located, and an annular plate portion that contacts the inner surface of the flat plate portion. A cylindrical portion that is erected and a second opening portion through which the igniter is inserted and extended continuously from an end portion of the tubular portion opposite to the side where the flat plate portion is located. Including a shelf part provided,
The resin molding portion is configured so as to close at least the inner wall surface of the second opening portion from the position on the inner surface located on the combustion chamber side of the shelf plate portion and the shelf plate portion so as to close the second opening portion. Cover these surfaces by being provided to reach the position on the inner surface of the flat plate portion through the outer surface located on the opposite side of the inner surface and the inner peripheral surface of the cylindrical portion,
The gas generator, wherein the inner peripheral edge of the annular plate portion is located outside the first opening when the bottom plate portion is viewed along the axial direction. The top plate portion and the peripheral wall portion are constituted by a bottomed cylindrical upper shell,
2. The gas generator according to claim 1, wherein the first bottom plate member is constituted by a lower shell made of only the flat plate portion.   The resin molded portion reaches from the position on the inner surface of the flat plate portion to the position on the outer surface located on the side opposite to the inner surface of the flat plate portion through the inner wall surface of the first opening. The gas generator according to claim 1 or 2, wherein the gas generator is further provided to cover these surfaces. The igniter includes an igniter that contains an igniter for burning the gas generating agent, and a terminal pin connected to the igniter for igniting the igniter,
The terminal pin is inserted and arranged in the second opening so that the ignition part is located on the combustion chamber side,
The gas generator according to any one of claims 1 to 3, wherein the second opening has a size or a shape through which the ignition unit cannot pass. The resin molded part includes a female connector part capable of receiving a male connector,
The gas generator according to any one of claims 1 to 4, wherein the female connector part is located in the cylindrical part and in the second opening part so as to face a space outside the housing. A hollow cylindrical filter housed inside the housing so as to surround the combustion chamber along the radial direction of the peripheral wall portion;
The filter abuts against an inner surface of the first bottom plate member;
The second bottom plate member abuts on an inner peripheral surface of an axial end portion located on the first bottom plate member side of the filter and abuts on the inner surface of the first bottom plate member, thereby the filter and the first plate member. 1 further includes an annular shield that covers the gap between the bottom plate member,
The gas generator according to any one of claims 1 to 5, wherein the shielding portion is provided so as to continuously extend from an outer peripheral edge of the annular plate portion.

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