JP4912942B2 - Gas generator - Google Patents

Description

  The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted on an automobile or the like.

  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. An airbag device is installed in a vehicle or the like for the purpose of protecting an occupant from an impact caused by the collision of a vehicle or the like. It is intended to catch the passenger's body. The gas generator is a device that is incorporated in the airbag device and inflates and deploys the airbag by instantaneously generating gas when a vehicle or the like collides.

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

  In this cylinder type gas generator, the flame generated by the operation of the igniter is transmitted to the gas generating agent through the combustion of the explosive charge, whereby the gas generating agent burns to generate high-temperature and high-pressure gas. . The generated high-temperature and high-pressure gas is ejected from the gas ejection port to the outside of the housing via the filter, and is used for inflation and deployment of the airbag. Here, the filter plays a role of preventing the residue (slag) contained in the generated gas from being discharged to the outside of the housing and cooling the gas.

  Further, a gas generator having a structure called “T-shaped” is known as a configuration similar to a cylinder type gas generator. The outer shape of the T-shaped gas generator is a long cylindrical shape like the above-described cylinder-type gas generator, and is suitably incorporated in a side airbag device or the like. In the T-shaped gas generator, a single igniter and a charge transfer agent are disposed at a substantially central portion in the axial direction, a gas generating agent is disposed on both sides in the axial direction, and a pair of outer sides in the axial direction is provided. A filter and a gas outlet are arranged.

  Also in this T-shaped gas generator, the flame generated by the operation of the igniter is transmitted to the gas generating agent located on both sides of the charge transfer agent through the combustion of the transfer charge, whereby the gas generating agent burns. High temperature and high pressure gas is generated. The generated high-temperature and high-pressure gas is ejected from the gas ejection port to the outside of the housing through filters located at both ends in the axial direction of the housing, and is used for inflation and deployment of the airbag, respectively. This T-shaped gas generator is distinguished from the above-described cylinder type gas generator in that a different gas output can be obtained from both ends in the axial direction of the housing by using a single igniter. It is.

In the cylinder type gas generator and the T-shaped gas generator, as described above, the space inside the housing is partitioned into a combustion chamber in which a gas generating agent is accommodated in an axial direction and a filter chamber in which a filter is accommodated. It is necessary to. Usually, the combustion chamber and the filter chamber are partitioned by inserting and fixing a disk-shaped partition plate inside a long cylindrical member. Examples of gas generators employing such a configuration include those disclosed in Japanese Patent Application Laid-Open No. 11-78766 (Patent Document 1), those disclosed in Japanese Patent Application Laid-Open No. 2001-151069 (Patent Document 2), and the like. One disclosed in Japanese Unexamined Patent Publication No. 2005-313812 (Patent Document 3) is known.
Japanese Patent Laid-Open No. 11-78766 JP 2001-151069 A JP 2005-313812 A

  In the cylinder type gas generator disclosed in Patent Documents 1 to 3, a cylindrical shape having a hollow opening extending in the same direction as the axial direction of a cylindrical member constituting a part of the housing as a filter accommodated in the filter chamber. These members are used. If a member having such a hollow opening is used as a filter, the flow resistance to the generated gas can be kept low, and an efficient gas flow can be realized. When a filter having such a hollow opening is used, the outer shape of the filter is usually designed to be slightly smaller than the inner diameter of the cylindrical member from the viewpoint of improving assemblability. It is important that the filter is positioned and fixed coaxially with the cylindrical member.

  If the positioning accuracy is insufficient, the axial end face of the filter may be exposed to the combustion chamber through the communication hole provided in the partition plate. There is a risk that the high pressure generated in the combustion chamber is directly applied to the axial end face of the filter and the filter is deformed. If the filter is deformed, a part of the generated gas may be ejected outside the housing without passing through the filter, and the insufficiency of the inflated / deployed airbag cannot be realized. The slag) is discharged outside the housing without being collected by the filter, causing a problem that the airbag is damaged. Further, when the positioning accuracy is insufficient, the size of the gap provided between the inner peripheral surface of the cylindrical member and the outer peripheral surface of the filter becomes non-uniform, and the stabilization of gas output is hindered. It can also lead to things.

  In the cylinder type gas generator disclosed in Patent Document 1, the partition plate is inserted into the cylindrical member and fixed by caulking, and the closing member is inserted into the opening end of the cylindrical member and fixed by caulking. A configuration is adopted in which a concave portion is provided, and the end portions in the axial direction of the filter are press-fitted into the concave portion, whereby the filter is sandwiched and fixed from both sides by a partition plate and a closing member. More specifically, a thin plate cylinder is attached so as to cover the inner peripheral surface and the outer peripheral surface of the filter, and the end portion of the filter together with the cylinder is press-fitted into a recess provided in the partition plate and the closing member. As a result, in the cylinder type gas generator disclosed in Patent Document 1, the filter is positioned by the recesses provided in the partition plate and the closing member. In the cylinder type gas generator, the partition plate is fixed to the cylindrical member by so-called eight-side caulking (caulking the cylindrical member partially toward the radially inner side), and the closing member is a so-called taurel. It is fixed to the cylindrical member by caulking (the end of the cylindrical member is bent toward the inside in the radial direction).

  However, when such a filter assembly structure is adopted, two types of caulking processes, namely, eight-sided caulking and taurel caulking, are required, and a plurality of manufacturing facilities for caulking and fixing are required, which reduces the manufacturing cost. Problems arise. Further, when inserting and press-fitting the end of the filter into the recess provided in each of the partition plate and the closing member, the area of the close contact portion constituted by the outer peripheral surface of the filter and the inner surface of the recess increases, Accordingly, there arises a problem that the filter is likely to be deformed due to the press-fitting. Therefore, in the case of adopting the assembly structure as described above, a thin plate-like cylinder that covers the outer peripheral surface of the filter is an essential component to prevent deformation of the filter during press-fitting, and the number of components increases. This results in an increase in cost.

  Further, in the cylinder type gas generator disclosed in Patent Document 2, a protrusion is provided on each of the partition plate inserted in the cylindrical member and the closing member attached to the opening end of the cylindrical member, and the protrusion is A configuration is adopted in which the filter is inserted into the axial end of the hollow opening of the filter, and the filter is sandwiched and fixed from both sides by a partition plate and a closing member. As a result, in the cylinder type gas generator disclosed in Patent Document 2, the filter is positioned by the protruding portions provided on the partition plate and the closing member. The document describes that the partition plate is press-fitted into the cylindrical member or is fitted to the cylindrical member by an embossed (unevenness) portion provided on the inner peripheral surface of the cylindrical member. Has been. On the other hand, although there is no description in the literature regarding how to fix the closing member to the cylindrical member, it is normally assumed that the member is welded to the cylindrical member.

  However, when such a filter assembly structure is adopted, the partition plate is fixed to the cylindrical member only by press-fitting or fitting by an embossed portion as described above. There is a risk of insufficient fixing strength. When such a shortage of fixing strength occurs, the partition plate is deformed or moved by the high pressure generated in the combustion chamber during the operation of the cylinder-type gas generator, so that the shaft of the filter is passed through the partition plate. There is a risk that the above-described high pressure is applied to the directional end face and the filter is deformed. Further, when the closing member is fixed to the cylindrical member by welding as described above, although the fixing strength is sufficiently secured, a complicated operation is required as compared with caulking, resulting in an increase in manufacturing cost. It will also lead to.

  Moreover, in the cylinder type gas generator disclosed in Patent Document 3, a filter is inserted between the partition plate inserted into the cylindrical member and the closed end of the cylindrical member, and the partition plate is pressed toward the filter. A configuration is adopted in which the filter is sandwiched and fixed from both sides by the partition plate and the closed end of the cylindrical member by fixing the partition plate by caulking. Here, a characteristic configuration for positioning the filter with high accuracy cannot be seen in the cylinder type gas generator disclosed in Patent Document 3, but the inner surface of the closed end of the cylindrical member is curved. It is assumed that the filter is naturally positioned to some extent by using a curved surface on the closed end side of the filter.

  However, when such a filter assembly structure is adopted, there is an advantage that the blocking member is not required and the number of parts can be reduced, but the filter is coaxially positioned and fixed with respect to the cylindrical member. It is very difficult to keep the positioning accuracy sufficiently high. When the positioning accuracy becomes insufficient, problems such as the above-described filter deformation and inhibition of gas output stabilization occur, leading to a decrease in yield.

  As described above, even when the filter assembly structure of any of Patent Documents 1 to 3 is adopted, it is difficult to say that both improvement of assembly performance and securing of product performance are sufficiently realized. is there. Therefore, the present invention has been made to solve such problems, and can easily and accurately position the filter with respect to the cylindrical member, and achieves both improvement in assembling property and securing of product performance. An object of the present invention is to provide an inexpensive gas generator.

The gas generator based on this invention is equipped with the elongate cylindrical member, the disk-shaped partition plate, the igniter, and the obstruction | occlusion member. The cylindrical member includes a combustion chamber in which a gas generating agent is accommodated and a filter chamber in which a filter is accommodated. The cylindrical member is provided with a gas outlet for ejecting gas to the peripheral wall of the portion defining the filter chamber. The partition plate is located inside the cylindrical member, and divides the space inside the cylindrical member into the combustion chamber and the filter chamber in the axial direction. In addition, the partition plate is provided with a communication hole that communicates the combustion chamber and the filter chamber at the center. The igniter is located on the combustion chamber side when viewed from the partition plate. The closing member closes the opening end by inserting at least a part of the opening end of the cylindrical member located on the filter chamber side when viewed from the partition plate. The filter includes a cylindrical member having a hollow opening extending in the same direction as the axial direction of the cylindrical member. The closing member has a protruding portion that protrudes toward the filter chamber side from a central portion of a main surface of a portion that defines the filter chamber, and abuts against an inner peripheral surface of the filter, and the peripheral wall of the cylindrical member The first caulking portion provided by reducing the diameter of the peripheral wall of the cylindrical member toward the inner side in the radial direction is engaged with a groove provided on the peripheral surface opposite to the cylindrical member, thereby being fixed to the cylindrical member. ing. The peripheral edge of the partition plate is axially reduced by the second caulking portion provided at a position sandwiching the partition plate by reducing the diameter of the peripheral wall of the cylindrical member inward in the radial direction. Is fixed to the cylindrical member. One end portion of the filter in the axial direction is in a state where one end surface of the filter included in the one end portion is in contact with the closing member, and the protruding portion provided on the closing member is the hollow opening portion of the filter. It is being fixed to the said obstruction | occlusion member by being inserted in. The other end portion of the filter in the axial direction is positioned on the filter chamber side of the pair of second caulking portions in a state where the other end surface of the filter included in the other end portion is in contact with the partition plate. It is fixed to the cylindrical member by being sandwiched radially inward by the caulking portion. The protrusion provided on the closing member has either a curved tapered shape at the tip or a tapered shape with a tapered tip at the periphery of the tip surface.

With this configuration, the filter is positioned with respect to the cylindrical member at both ends in the axial direction of the filter by the protruding portion provided on the closing member and the caulking portion provided on the cylindrical member. Become. Therefore, the filter can be easily positioned with high accuracy with respect to the cylindrical member. Therefore, the filter can be prevented from being deformed when the filter is assembled or the gas generator is operated, and the adhesion of the filter to the closing member can be improved after the assembly to prevent gas leakage at the portion. become. Therefore, the gas generator can be manufactured at low cost, and can be easily and highly accurately positioned with respect to the cylindrical member of the filter, thereby achieving a gas generator that achieves both improved assembling and ensuring product performance. . Moreover, since the tip end portion of the projecting portion functions as a wind direction plate by such a configuration, it is necessary to effectively prevent a decrease in the amount of gas passing through the end portion of the filter on the closing member side. Cooling efficiency can be obtained, and unintentional deformation can be prevented from occurring in the filter when the protrusion is inserted into the hollow opening of the filter.
In the gas generator according to the present invention, the groove provided in the closing member is provided in an annular shape along the circumferential direction, and the first caulking portion provided in the cylindrical member is provided in the groove. The sealing member is interposed between the cylindrical member and the blocking member by uniformly reducing the diameter of the peripheral wall of the portion corresponding to the inner side in the radial direction. It is preferable to fix to the said cylindrical member by eight-side caulking without making it.

  In the gas generator based on the said invention, it is preferable that the said protrusion part provided in the said closure member is press-fit in the said hollow opening part of the said filter.

  By comprising in this way, since the adhesiveness with respect to the closure member of the filter after an assembly | attachment can be improved further, while being able to prevent the leak of the gas in the said part more reliably, the filter after an assembly | attachment Can be held more reliably.

  In the gas generator according to the present invention, the axial length L of the filter and the axial length H of the portion of the protrusion provided on the closing member that contacts the inner peripheral surface of the filter are H It is preferable that the conditions of ≧ 2 mm and 1/10 ≦ H / L ≦ 1/4 are satisfied.

  By comprising in this way, coexistence with improvement of assembly property and ensuring of product performance is realizable, without enlarging the external shape of a gas generator.

  In the gas generator according to the present invention, it is preferable that the caulking portion located on the filter chamber side of the pair of second caulking portions is in pressure contact with the outer peripheral surface of the filter.

  With this configuration, the filter can be held more reliably after assembly.

  In the gas generator based on the said invention, it is preferable that the said closure member has a recessed part in the axial direction end surface of the side in which the said protrusion part is not provided.

  By comprising in this way, it becomes possible to restrain the weight of a closure member comparatively small, and it becomes possible to reduce the weight as the whole gas generator.

  According to the present invention, a gas generator that can be manufactured at low cost, can be easily and highly accurately positioned with respect to a cylindrical member of a filter, and thereby achieves both improvement of assembly and ensuring of product performance, and can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment described below, a so-called cylinder type gas generator and a T-shaped gas generator incorporated in a side airbag device or the like will be described by specifically illustrating them.

(Embodiment 1)
1A and 1B are diagrams showing an external structure of a cylinder type gas generator according to Embodiment 1 of the present invention. FIG. 1A is a front view and FIG. 1B is a right side view. Moreover, FIG. 2 is a figure which shows the internal structure of the cylinder type gas generator in this Embodiment, and is sectional drawing along the II-II line shown to FIG. 1 (A) and FIG. 1 (B). First, with reference to these FIG. 1 (A), FIG. 1 (B), and FIG. 2, the external appearance structure and internal structure of the cylinder type gas generator in this Embodiment are demonstrated.

  As shown in FIG. 1A, FIG. 1B, and FIG. 2, the cylinder type gas generator 1A in the present embodiment has a long and substantially cylindrical outer shape, The closing member 20 and the base member 30 are included. The cylindrical member 10 is composed of a long member having openings at both ends in the axial direction. The closing member 20 is made of a disk-shaped member having a predetermined thickness, and has a groove 21 for caulking and fixing described later on the peripheral surface thereof. The caulking and fixing groove 21 is formed on the peripheral surface of the closing member 20 so as to extend in the circumferential direction. The base member 30 is formed of a cylindrical member having a hollow portion 32 extending in the same direction as the axial direction of the cylindrical member 10, and has a groove 31 for caulking and fixing described later at a predetermined position on the outer peripheral surface thereof. . The caulking fixing groove 31 is formed on the outer peripheral surface of the base member 30 so as to extend in the circumferential direction.

  The closing member 20 is attached to the cylindrical member 10 so as to close one open end of the cylindrical member 10. On the other hand, the base member 30 is attached to the other open end of the cylindrical member 10. A disk-shaped partition plate 15 is disposed at a predetermined position in the axial direction of the cylindrical member 10. The partition plate 15 partitions the space inside the cylindrical member 10 in the axial direction.

  The cylindrical member 10, the partition plate 15, the closing member 20, and the base member 30 are all made of metal members such as stainless steel, steel, aluminum alloy, and stainless alloy, and are connected and fixed by caulking. Yes. Specifically, a part of the cylindrical member 10 corresponding to the groove 21 provided on the peripheral surface of the closing member 20 in a state where a part of the closing member 20 is inserted into one opening end of the cylindrical member 10. The closure member 20 is caulked and fixed to the cylindrical member 10 by reducing the diameter of the peripheral wall inward in the radial direction and engaging with the groove 21, and the base member 30 is fixed to the other opening end of the cylindrical member 10. In a state where a part thereof is inserted, the peripheral wall of the cylindrical member 10 corresponding to the groove 31 provided on the outer peripheral surface of the base member 30 is radially reduced in diameter and engaged with the groove 31. Thus, the base member 30 is caulked and fixed to the cylindrical member 10. Further, the partition plate 15 inserted at a predetermined position of the cylindrical member 10 is reduced in diameter with the peripheral walls of both side portions of the cylindrical member 10 corresponding to the portion where the partition plate 15 is located facing radially inward. The peripheral edge is sandwiched in the axial direction of the cylindrical member 10 by the pair of caulking portions formed by the fixing, so that the caulking is fixed to the cylindrical member 10.

  These caulking fixings are caulking fixings called eight-side caulking that uniformly reduce the diameter of the peripheral wall of the cylindrical member 10 inward in the radial direction. By performing this caulking, the first to third caulking portions 12 to 14 are provided on the peripheral wall of the cylindrical member 10. Among these caulking portions, the first caulking portion 12 is a caulking portion for fixing the closing member 20 to the cylindrical member 10, and the second caulking portion 13 is for fixing the partition plate 15 to the cylindrical member 10. The third caulking portion 14 is a caulking portion for fixing the base member 30 to the cylindrical member 10. By using the above-mentioned eight-way caulking, airtightness can be sufficiently ensured without interposing a seal member between two members to be caulked and fixed.

  As shown in FIGS. 1A and 2, a gas outlet 11 is provided on the peripheral wall near the end of the cylindrical member 10 on the side where the closing member 20 is attached. The gas ejection ports 11 are holes for ejecting the gas generated inside the cylinder type gas generator 1 </ b> A to the outside, and a plurality of gas ejection ports 11 are provided along the circumferential direction and the axial direction of the cylindrical member 10.

  As shown in FIG. 2, an ignition chamber 16, a combustion chamber 17, and a filter chamber 18 are provided in a space inside the cylinder type gas generator 1 </ b> A defined by the cylindrical member 10, the closing member 20 and the base member 30. ing. The partition plate 15 described above partitions the combustion chamber 17 and the filter chamber 18 among them. On the other hand, the ignition chamber 16 and the combustion chamber 17 are partitioned by a cushion material 51 described later.

  The ignition chamber 16 is mainly defined by the cylindrical member 10, the base member 30, and the cushion material 51, and is provided in a portion near the other end of the cylindrical member 10 (right side portion in the drawing). An igniter (squib) 40 is disposed in the hollow portion 32 of the base member 30, and the resin molding portion 34 is located between the base member 30 and the igniter 40. A bottomed cylindrical cup-shaped member 35 is attached to the end of the base member 30 on the combustion chamber 17 side, and a heat transfer chamber 36 that is a space inside the bottomed cylindrical cup-shaped member 35 is provided. Contains an explosive charge (enhancer) 37.

  A concave portion 33 is provided on the outer peripheral surface of the base member 30 (that is, the surface facing the inner peripheral surface of the cylindrical member 10) so as to extend in the circumferential direction, and a seal member 38 is accommodated in the concave portion 33. ing. The seal member 38 is for hermetically sealing a gap generated between the cylindrical member 10 and the base member 30, and thereby the airtightness between the outside of the cylinder type gas generator 1 </ b> A and the ignition chamber 16. Will be secured. Further, the space between the inner peripheral surface of the base member 30 and the igniter 40 is sealed by the resin molding portion 34 as described above, whereby the space between the outside of the cylinder type gas generator 1A and the ignition chamber 16 is sealed. Airtightness is ensured.

  Note that a member having sufficient heat resistance and durability is preferably used as the sealing member 38 described above. For example, an O-ring made of EPDM resin, which is a kind of ethylene propylene rubber, can be suitably used. The seal member 38 is inserted and attached between these members when the cylindrical member 10 and the base member 30 are fixed by caulking. If a liquid sealant is separately applied to the portion where the seal member 38 is interposed and cured, higher airtightness can be obtained.

  The above-mentioned resin molding portion 34 is formed by, for example, insert molding, and the raw material thereof is a thermosetting resin typified by an epoxy resin or the like, polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin (for example, nylon 6). And thermoplastic resins represented by polypropylene sulfide resin, polypropylene oxide resin, and the like.

  The igniter 40 is an ignition device for generating a flame, and includes an ignition unit 41 and a terminal pin 42. The ignition unit 41 includes an igniting agent that ignites during operation and a resistor for burning the igniting agent. The terminal pin 42 is connected to the ignition unit 41 in order to ignite the igniting agent. More specifically, the igniter 40 includes a base portion through which the pair of terminal pins 42 are inserted and held, and a squib cup attached to the base portion, and the tip of the terminal pin 42 inserted into the squib cup. A resistor (bridge wire) is attached so as to connect the squib cups, and an igniting agent is filled in the squib cup so as to surround the resistor or in contact with the resistor. 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 is generally made of metal or plastic.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 42. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition powder starts to burn upon receiving this heat. The high temperature flame generated by the combustion ruptures the squib cup containing the igniting agent. The time from when the current flows through the resistor until the igniter 40 is activated is 2 milliseconds or less when a nichrome wire is used as the resistor.

The explosive charge 37 is ignited by a flame generated by the operation of the igniter 40 and burns to generate hot particles. It is necessary for the charge transfer agent 37 to be able to reliably start the gas generating agent 52 described later. Generally, from the metal powder / oxidant represented by B / KNO ₃ or the like. The composition etc. which become are used. As the explosive charge 37, a powdery one, a one molded into a predetermined shape by a binder, or the like is used. Examples of the shape of the transfer charge molded by the binder include various shapes such as a granular shape, a columnar shape, a sheet shape, a spherical shape, a single-hole cylindrical shape, a porous cylindrical shape, and a tablet shape.

  The combustion chamber 17 is defined by the cylindrical member 10, the partition plate 15, and the cushion material 51, and is provided at a substantially central portion of the cylindrical member 10. A gas generating agent 52 is mainly accommodated in the combustion chamber 17.

  The gas generating agent 52 is ignited by the heat particles generated by burning the charge transfer agent 37 ignited by the igniter 40, and generates gas by burning. The gas generating agent 52 is generally formed as a molded body containing a fuel, an oxidant, and an additive. As the fuel, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used. In addition, as the oxidizing agent, for example, nitrate containing a cation selected from alkali metals, alkaline earth metals, transition metals, and ammonia is used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used. In addition, examples of the additive include a binder, a slag forming agent, and a combustion adjusting agent. As the binder, for example, 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 52 includes various shapes such as a granular shape, a pellet shape, a cylindrical shape, and a disk shape. In addition, a porous (for example, a single-hole cylindrical shape or a porous cylindrical shape) having a hole inside the molded body is also used. These shapes are preferably appropriately selected according to the specifications of the airbag apparatus in which the cylinder type gas generator 1A is incorporated. For example, the shape in which the gas generation rate changes with time when the gas generating agent 52 is burned. It is preferable to select an optimal shape according to the specification, such as selecting. In addition to the shape of the gas generating agent 52, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear combustion rate, the pressure index, etc. of the gas generating agent 52.

  The cushion material 51 that partitions the ignition chamber 16 and the combustion chamber 17 is disposed so as to contact the gas generating agent 52 accommodated in the combustion chamber 17. The cushion material 51 is provided for the purpose of preventing the gas generating agent 52 made of a molded body from being pulverized by vibration or the like, and a ceramic fiber molded body, foamed silicon, or the like is preferably used. The cushion material 51 is opened or divided by the combustion of the charge transfer agent 37 during operation, and in some cases burns down.

  A communication hole 15 a that communicates the combustion chamber 17 and the filter chamber 18 during operation is provided at the center of the partition plate 15 that partitions the combustion chamber 17 and the filter chamber 18. A seal member 15b is affixed to the main surface of the partition plate 15 located on the combustion chamber 17 side so as to close the communication hole 15a. As the seal member 15b, an aluminum foil or the like having an adhesive member applied on one side is used. As a result, airtightness between the combustion chamber 17 and the filter chamber 18 during non-operation is ensured, and mixing of moisture and the like into the combustion chamber 17 is prevented.

  A perforated plate 19 provided with a plurality of communication holes 19 a is disposed at an end portion of the combustion chamber 17 located on the partition plate 15 side. The porous plate 19 rectifies the flow of gas released from the combustion chamber 17 during operation, and prevents the gas generating agent 52 accommodated in the combustion chamber 17 from moving to the filter chamber 18 in an unburned state. Is for. Therefore, all the communication holes 19 a provided in the porous plate 19 are formed smaller than the outer shape of the gas generating agent 52 and are formed smaller than the communication holes 15 a provided in the partition plate 15.

  The filter chamber 18 is defined by the cylindrical member 10, the closing member 20, and the partition plate 15, and is provided in a portion near the one end of the cylindrical member 10 (the left portion in the drawing). A filter 53 is accommodated in the filter chamber 18. The filter chamber 18 communicates with the outside through the gas outlet 11 provided on the peripheral wall of the cylindrical member 10 described above.

  The filter 53 is made of a cylindrical member having a hollow opening 53 a extending in the same direction as the axial direction of the cylindrical member 10. If a filter composed of a cylindrical member is used in this way, the flow resistance of the working gas flowing through the filter chamber 18 during operation can be kept low, and an efficient gas flow can be realized. As the filter 53, for example, a wire made of a metal such as stainless steel or steel, a wire wound around a net, or a material compressed by pressing is used. Specifically, a knitted wire mesh, a plain weave wire mesh, an assembly of crimped metal wires, or the like is used. When the gas generated in the combustion chamber 17 passes through the filter 53, the filter 53 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.

  The closing member 20 has a protruding portion 22 that protrudes toward the filter chamber 18 at the center of the main surface of the portion that defines the filter chamber 18. The protrusion 22 is entirely inserted into the hollow opening 53 a of the filter 53.

  A female connector (not shown) is attached to the end of the cylinder type gas generator 1A where the base member 30 is disposed. This female connector is a part to which a male connector of a harness that transmits a signal from a collision detection sensor provided separately from the cylinder type gas generator 1A is connected. A shorting clip (not shown) is attached to the female connector as necessary. The shorting clip is attached to prevent the cylinder type gas generator 1A from malfunctioning due to electrostatic discharge or the like during the transportation of the cylinder type gas generator 1A. In the stage, the male connector of the harness is inserted into the female connector, so that the contact with the terminal pin 42 is released.

  Next, the operation | movement at the time of the action | operation of the cylinder type gas generator 1A demonstrated above is demonstrated. When a vehicle equipped with an airbag device incorporating the cylinder-type gas generator 1A according to the present embodiment collides, the collision is detected by a collision detection means provided separately in the vehicle, and ignition is performed based on this. The device 40 is activated. When the igniter 40 is actuated, the pressure in the ignition unit 41 is increased by combustion of the igniting agent, whereby the ignition unit 41 is ruptured and the flame flows out of the ignition unit 41. The explosive charge 37 accommodated in the ignition chamber 16 is ignited and burned by the flame generated by the operation of the igniter 40, and generates a large amount of heat particles. Due to the combustion of the transfer agent 37, the pressure in the transfer chamber 36 rises, whereby the cup-shaped member 35 is ruptured, and the above-described heat particles reach the cushion material 51. The thermal particles that have reached the cushion material 51 burn the cushion material 51 to open or divide it, whereby the thermal particles flow into the combustion chamber 17 and reach the gas generating agent 52.

  The gas generating agent 52 is ignited and burned by the flowing heat particles, and a large amount of gas is generated. Due to the combustion of the gas generating agent 52, the pressure in the combustion chamber 17 increases, whereby the sealing of the seal member 15 b is broken, and the generated gas flows into the filter chamber 18. The gas that has flowed in flows through the hollow opening 53a of the filter 53, is then cooled to a predetermined temperature via the filter 53, and is ejected from the gas outlet 11 to the outside of the cylinder type gas generator 1A. The The gas ejected from the gas ejection port 11 is guided into the airbag to inflate and deploy the airbag.

  FIG. 3 is an enlarged cross-sectional view of region III shown in FIG. 2, and FIG. 4 is an enlarged cross-sectional view of region IV shown in FIG. Next, the assembly structure of the filter of the cylinder type gas generator in the present embodiment will be described in detail with reference to FIGS.

  As shown in FIG. 2, in the cylinder type gas generator 1 </ b> A in the present embodiment, the filter 53 is coaxially disposed and fixed with respect to the cylindrical member 10. The filter 53 includes a partition plate 15 that is inserted into the cylindrical member 10 and fixed by caulking, and a closing member 20 that is partially inserted into the opening end of the cylindrical member 10 and fixed by caulking. It is fixed to the cylindrical member 10 by being sandwiched in the direction. Here, the positioning (centering) of the filter 53 with respect to the cylindrical member 10 is performed by a pair of second caulkings for caulking and fixing the protruding portion 22 provided on the closing member 20 and the partition plate 15 to the cylindrical member 10. This is performed by a caulking portion located on the filter chamber 18 side of the portion 13.

  More specifically, as shown in FIG. 3, the protrusion 22 provided on the closing member 20 is adjusted in size so that it can be inserted into the hollow opening 53 a provided on the filter 53. The projection 22 is inserted into the hollow opening 53 a of the filter 53, so that one end of the filter 53 is held by the closing member 20. After the assembly, the side surface 22 a of the protrusion 22 is in contact with the inner peripheral surface 53 b of the filter 53, and the end surface of the filter 53 on the closing member 20 side is in contact with the main surface of the closing member 20. With this configuration, one end portion of the filter 53 is held by the closing member 20 in a state where the projecting portion 22 provided on the closing member 20 is positioned (centered) with respect to the cylindrical member 10. Become. In order to improve the adhesion between the closing member 20 and the filter 53, it is preferable that the protrusion 22 of the closing member 20 is press-fitted into the hollow opening 53 a of the filter 53.

  On the other hand, as shown in FIG. 4, the other end portion of the filter 53 is sandwiched radially inward by the caulking portion located on the filter chamber 18 side of the caulking portion 13 provided in the cylindrical member 10. Is held by. After assembly, the top portion (top surface) of the caulking portion on the filter chamber 18 side is in contact with the outer peripheral surface 53 c of the filter 53, and the end surface on the partition plate 15 side of the filter 53 is the main surface of the partition plate 15. Abut. With this configuration, the other end portion of the filter 53 is held by the cylindrical member 10 in a state where positioning (centering) with respect to the cylindrical member 10 is performed by the caulking portion provided in the cylindrical member 10. Will be. Preferably, the cylindrical member 10 is caulked to such an extent that the caulking portion is pressed against the filter 53.

  By adopting such an assembly structure of the filter 53, the filter 53 is positioned (centered) with respect to the cylindrical member 10 at both ends in the axial direction. Therefore, the filter 53 can be positioned with high accuracy with respect to the cylindrical member 10, and these members are arranged coaxially with high accuracy after assembly. Therefore, the positioning of the hollow opening 53a provided in the filter 53 and the communication hole 15a provided in the partition plate 15 is also performed with high accuracy, and the axial end surface of the filter 53 is located through the communication hole 15a. Exposure to the combustion chamber 17 can be reliably prevented, and the high pressure generated in the combustion chamber 17 during operation can be prevented from being directly applied to the axial end surface of the filter 53 to deform the filter 53. Further, the partition plate 15 has a peripheral edge in the axial direction of the cylindrical member 10 by the pair of second caulking portions 13 provided by reducing the diameter of the peripheral wall of the cylindrical member 10 inward in the radial direction as described above. Therefore, the partition plate 15 may be deformed or moved by a high pressure generated in the combustion chamber 17 during operation. Therefore, the filter member 53 is reliably held by the cylindrical member 10, and the filter 53 is protected by the partition plate 15 and can be reliably prevented from being deformed.

  Further, when the above assembly structure is adopted, not only the end surface of the filter 53 on the closing member 20 side abuts (preferably pressure contact) with the closing member 20 but also the end portion of the filter 53 on the closing member 20 side. In this case, the inner peripheral surface 53b is in contact (preferably in pressure contact) with the side surface 22a of the protrusion 22 provided on the closing member 20. For this reason, the area of the adhesion part with respect to the closure member 20 of the filter 53 increases, and the leak of the gas in the edge part of the said filter 53 can be prevented reliably. If the close contact portion is provided on the inner peripheral surface 53b side of the filter 53 as described above, the close contact portion is provided on the outer peripheral surface 53c side of the filter 53 (for example, the cylinder disclosed in Patent Document 1 described above). As compared with the case of the configuration of the mold gas generator), even when the contact distance is increased in the axial direction, the increase in the area of the contact portion can be suppressed. Accordingly, the area of the close contact portion can be prevented from becoming larger than necessary, and deformation of the filter 53 that can occur during insertion (preferably press-fitting) can be sufficiently suppressed. Therefore, it is not necessary to attach a thin plate-like cylinder to the inner peripheral surface 53b of the filter 53, and an increase in the number of parts can be suppressed. Therefore, the manufacturing cost can be reduced.

  Furthermore, when the above assembly structure is employed, the filter 53 can be assembled to the cylindrical member 10 with a very simple operation. Specifically, the filter 53 is placed so that the protruding portion 22 of the closing member 20 that is caulked and fixed to the cylindrical member 10 is inserted into the hollow opening 53a of the filter 53 (preferably press-fitted). By attaching the partition plate 15 to the cylindrical member 10 and then crimping and fixing the partition plate 15 toward the filter 53 side, the filter 53 is assembled to the cylindrical member 10. Complete. Therefore, the assembling work is not complicated as compared with the conventional one, and the manufacturing cost does not increase.

  In the above assembly structure, the protrusion 22 provided on the closing member 20 is configured to be press-fitted into the hollow opening 53a of the filter 53, and the outer peripheral surface 53c of the filter 53 is pressed into contact with the caulking portion. If it is configured to be in a state, the filter can be held more reliably after assembly.

  As described above, with the cylinder-type gas generator 1A as in the present embodiment, the filter 53 can be easily and accurately positioned with respect to the cylindrical member 10. Therefore, it becomes possible to manufacture a cylinder-type gas generator that achieves both improvement in assemblability and product performance at a low cost.

  In addition, as an axial length of the protrusion part 22 provided in the closure member 20, the axial direction length (press-fit in the case of press fitting) H of the part contact | abutted to the internal peripheral surface of the filter 53 (refer FIG. 1) However, in relation to the axial length L of the filter 53 (see FIG. 1), it is preferable that the conditions of H ≧ 2 mm and 1/10 ≦ H / L ≦ 1/4 are satisfied. If comprised in this way, coexistence of improvement of an assembly property and ensuring of product performance is realizable, without enlarging an apparatus.

  Specifically, when H <2 mm or H / L <1/10, the inner peripheral surface 53b of the filter 53 and the side surface 22a of the protruding portion 22 are in contact (preferably pressure contact). The axial length of the close contact portion is insufficient, and there is a possibility that gas leaks through the portion, that is, the gas may be ejected from the cylinder type gas generator 1A without passing through the filter 53. . On the other hand, when H / L> 1/4, the protruding portion 22 inhibits the gas flow, and the amount of gas passing through the end portion of the filter 53 on the closing member 20 side is reduced. There is a possibility that the cooling efficiency cannot be obtained. In order to effectively prevent such a decrease in the amount of gas passing through the end of the filter 53 on the closing member 20 side, the tip of the protrusion 22 is curved (see FIG. 3) or tapered tapered. It is conceivable that the gas is guided to the portion of the filter 53 by forming the shape and functioning this portion as a wind direction plate.

  5 and 6 are enlarged sectional views in the vicinity of the closing member in a modification of the cylinder type gas generator in the present embodiment. Next, a modification of the cylinder type gas generator in the present embodiment will be described with reference to these drawings.

  In the above-described cylinder type gas generator 1A in the present embodiment, the case where the shape of the tip of the protrusion 22 is curved has been described as an example, but the shape of the tip is not particularly limited. It is optional. For example, as shown in FIG. 5, the shape of the tip of the protrusion 22 may be a flat surface. In the case of such a configuration, an inclined surface is provided on the peripheral edge of the front end surface of the projecting portion 22 as shown in order to prevent deformation of the filter 53 during insertion (preferably press-fitting). Is preferred.

  Moreover, in the cylinder type gas generator 1A in the first embodiment described above, the case where the closing member 20 is configured by a disk-shaped member having a predetermined thickness has been described as an example. It does not necessarily have to be a disk shape. For example, as shown in FIG. 6, the shape is such that the recess 23 is provided in the axial end surface in a direction different from the main surface on the filter chamber 18 side (that is, the end surface constituting the exposed surface of the cylinder type gas generator). It is also possible to use a member. If the closing member having such a shape is used, the weight of the closing member 20 can be kept relatively small, and the weight of the entire cylinder-type gas generator can be reduced. In addition, since formation of the said recessed part 23 can be easily performed by cold forging, it is also possible to suppress the increase in cost.

(Embodiment 2)
7A and 7B are diagrams showing the external structure of a T-shaped gas generator according to Embodiment 2 of the present invention. FIG. 7A is a front view, and FIG. 7B is a top view. Moreover, FIG. 8 is a figure which shows the internal structure of the T-shaped gas generator in this Embodiment, and is sectional drawing along the VIII-VIII line shown to FIG. 7 (B). In addition, the same code | symbol is attached | subjected in the figure about the part similar to the cylinder type gas generator 1A in the above-mentioned Embodiment 1, and the description is not repeated here.

  As shown in FIGS. 7A, 7B, and 8, the T-shaped gas generator 1B in the present embodiment has a long and substantially cylindrical outer shape, and a pair of cylindrical shapes. The member 10, the pair of closing members 20, the connecting member 60, and the base member 30 are included. Each of the pair of cylindrical members 10 is formed of a long member having an opening at one end in the axial direction and a bottom plate portion 10a at the other end. The bottom plate portion 10a is formed, for example, by joining a disk-shaped plate member to the other end of the cylindrical member 10 by welding or the like. Each of the pair of closing members 20 is made of a disk-shaped member having a predetermined thickness, and has a groove 21 for caulking and fixing on the peripheral surface thereof. The connecting member 60 is composed of a T-shaped hollow tube and has open ends on three sides thereof. The base member 30 is made of a cylindrical member having a hollow portion, and has a groove 31 for caulking and fixing at a predetermined position on the outer peripheral surface thereof. In addition, the said connection member 60 consists of metal members, such as stainless steel, steel, an aluminum alloy, a stainless alloy, like another member.

  The end portions on the bottom side of the pair of cylindrical members 10 are respectively inserted into the pair of open ends at the positions where the connecting members 60 face each other, and the connecting members 60 and the pair of cylindrical members are inserted. 10 is fixed by being welded by a welding portion 61. On the other hand, the base member 30 is fixed by caulking to the remaining open end of the connecting member 60. For the caulking and fixing of the base member 30 to the connecting member 60, an eight-side caulking according to the base member 30 for the cylindrical member 10 described in the first embodiment is employed.

  A closing member 20 is attached and fixed to each of the opening ends of the pair of cylindrical members 10 so as to close the opening ends. Each of the pair of cylindrical members 10 is fixed with a disk-shaped partition plate 15 at a predetermined position in the axial direction thereof. The caulking and fixing of the closing member 20 to the cylindrical member 10 employs the eight-way caulking described in the first embodiment, and the caulking and fixing of the partition plate 15 to the cylindrical member 10 are performed as described above. The eight-way caulking described in the first embodiment is adopted.

  A gas outlet 11 is provided on each of the peripheral walls in the vicinity of the end of the pair of cylindrical members 10 on the side where the closing member 20 is attached. The gas ejection port 11 is a hole for ejecting the gas generated inside the T-shaped gas generator 1B to the outside, and a plurality of gas ejection ports 11 are provided along the circumferential direction and the axial direction of the cylindrical member 10. .

  The space inside the T-shaped gas generator 1B defined by the pair of cylindrical members 10, the pair of closing members 20, the connecting member 60, and the base member 30 includes an ignition chamber 16, a pair of combustion chambers 17, and a pair of A filter chamber 18 is provided. The partition plate 15 described above divides the combustion chamber 17 and the filter chamber 18 inside each cylindrical member 10. On the other hand, the ignition chamber 16 and each of the pair of combustion chambers 17 are partitioned by respective bottom plates 10 a of the pair of cylindrical members 10.

  The ignition chamber 16 is mainly defined by the connecting member 60, the bottom plate 10a of each of the pair of cylindrical members 10, and the base member 30, and is provided at the center of the T-shaped gas generator 1B. In the cylinder type gas generator 1A in the first embodiment described above, the cup-shaped member 35 is attached to the base member 30 so as to cover the ignition part 41 of the igniter 40, but in the T-shaped in the present embodiment. Such a cup-shaped member is not attached to the base member 30 in the gas generator 1B. An igniter 40 is attached to the hollow portion of the base member 30. Further, a transfer charge 37 is accommodated in the ignition chamber 16.

  Each bottom plate 10a of the pair of cylindrical members 10 is provided with a communication hole 10b for communicating the ignition chamber 16 and the combustion chamber 17 during operation. A seal member 10c is affixed to the main surface of the pair of bottom plates 10a located on the ignition chamber 16 side so as to close the communication hole 10b. As the sealing member 10c, an aluminum foil or the like having an adhesive member applied on one side is used. As a result, airtightness between the ignition chamber 16 and the combustion chamber 17 during non-operation is ensured, and mixing of moisture and the like into the ignition chamber 16 and the combustion chamber 17 is prevented.

  The pair of combustion chambers 17 are respectively defined by the peripheral wall of the cylindrical member 10, the bottom plate 10 a and the partition plate 15, and are provided at positions where the above-described ignition chamber 16 is sandwiched in the axial direction. A gas generating agent 52 is mainly accommodated in each of the pair of combustion chambers 17. A cushion material 51 is disposed on the main surface of the bottom plate 10a of the cylindrical member 10 on the combustion chamber 17 side.

  The pair of filter chambers 18 are respectively defined by the cylindrical member 10, the closing member 20, and the partition plate 15. The pair of filter chambers 18 are provided at positions where the ignition chamber 16 and the pair of combustion chambers 17 located between the above-described ignition chambers 16 are further interposed in the axial direction. It has been. A filter 53 having a hollow opening 53 a extending in the same direction as the axial direction of the cylindrical member 10 is accommodated in each of the pair of filter chambers 18. Each of the pair of filter chambers 18 communicates with the outside via the gas outlets 11 provided on the peripheral walls of the pair of cylindrical members 10 described above.

  Next, the operation | movement at the time of the action | operation of the T-shaped gas generator 1B demonstrated above is demonstrated. When a vehicle equipped with an airbag device incorporating the T-shaped gas generator 1B in the present embodiment collides, the collision is detected by a collision detection means provided separately in the vehicle, and based on this The igniter 40 is activated. When the igniter 40 is actuated, the pressure in the ignition unit 41 is increased by combustion of the igniting agent, whereby the ignition unit 41 is ruptured and the flame flows out of the ignition unit 41. The explosive charge 37 accommodated in the ignition chamber 16 is ignited and burned by the flame generated by the operation of the igniter 40, and generates a large amount of heat particles. Due to the combustion of the charge transfer agent 37, the pressure in the ignition chamber 16 increases, whereby the seal of the seal member 10c is broken, and the above-described hot particles are located on both sides of the ignition chamber 16 through the communication hole 10b. Flows into each of the combustion chambers 17. The flowing heat particles reach the cushion material 51, burn the cushion material 51, open or divide it, and reach the gas generating agent 52, respectively.

  The flowing heat particles ignite and burn the gas generating agent 52 in each of the pair of combustion chambers 17 located on both sides of the ignition chamber 16 to generate a large amount of gas. Due to the combustion of the gas generating agent 52, the pressure in the pair of combustion chambers 17 increases, whereby the seal of the seal member 15b is broken, and the generated gas flows into the pair of filter chambers 18, respectively. And the gas which flowed in flows through the hollow opening part 53a of the filter 53, and is cooled to predetermined temperature via the filter 53 after that, and it goes out of the T-shaped gas generator 1B from the gas ejection port 11, respectively. Erupted. The gas ejected from the gas ejection port 11 is guided into the airbag to inflate and deploy the airbag. As described above, in the T-shaped gas generator 1B in the present embodiment, different gas outputs can be obtained from both ends in the axial direction of the housing by using a single igniter.

  Also in the T-shaped gas generator 1B in the present embodiment described above, a filter assembly structure similar to the structure employed in the cylinder-type gas generator 1A in the first embodiment described above is employed. Each of the filters 53 is coaxially disposed and fixed with respect to the corresponding cylindrical member 10. Each of the pair of filters 53 includes a partition plate 15 that is inserted into the cylindrical member 10 and fixed by caulking, and a blocking member that is partly inserted into one opening end of the cylindrical member 10 and fixed by caulking. 20 and is fixed to the cylindrical member 10 by being sandwiched in the axial direction. Here, the positioning (centering) of each of the pair of filters 53 with respect to the cylindrical member 10 is performed by a pair of caulking and fixing of the protruding portion 22 provided in the closing member 20 and the partition plate 15 to the cylindrical member 10. Of the second caulking portion 13 and the caulking portion located on the filter chamber 18 side. By configuring in this way, the same effects as those described in the first embodiment can be obtained.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It 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.

It is a figure which shows the external appearance structure of the cylinder type gas generator in Embodiment 1 of this invention, (A) is a front view, (B) is a right view. It is a figure which shows the internal structure of the cylinder type gas generator in Embodiment 1 of this invention, and is sectional drawing along the II-II line shown to FIG. 1 (A) and FIG. 1 (B). It is an expanded sectional view of the area | region III shown in FIG. It is an expanded sectional view of the area | region IV shown in FIG. It is an expanded sectional view of the closure member vicinity in the modification of the cylinder type gas generator in Embodiment 1 of this invention. It is an expanded sectional view of the closure member vicinity in the other modification of the cylinder type gas generator in Embodiment 1 of this invention. It is a figure which shows the external appearance structure of the T-shaped gas generator in Embodiment 2 of this invention, (A) is a front view, (B) is a top view. It is a figure which shows the internal structure of the T-shaped gas generator in Embodiment 2 of this invention, and is sectional drawing along the VIII-VIII line shown to FIG. 7 (B).

Explanation of symbols

  1A cylinder type gas generator, 1B T-shaped gas generator, 10 cylindrical member, 10a bottom plate, 10b communication hole, 10c sealing member, 11 gas outlet, 12 first caulking part, 13 second caulking part, 14th 3 crimping portions, 15 partition plate, 15a communication hole, 15b seal member, 16 ignition chamber, 17 combustion chamber, 18 filter chamber, 19 porous plate, 19a communication hole, 20 closing member, 21 groove, 22 protrusion, 22a side surface, 23 recess, 30 base member, 31 groove, 32 hollow, 33 recess, 34 resin molding, 35 cup-shaped member, 36 transfer chamber, 37 transfer agent, 38 seal member, 40 igniter, 41 ignition unit, 42 terminal Pin, 51 Cushion material, 52 Gas generating agent, 53 Filter, 53a Hollow opening, 53b Inner peripheral surface, 53c Outer peripheral surface, 60 Connecting member 61 welds.

Claims (6)

A long cylinder that includes a combustion chamber containing a gas generating agent and a filter chamber containing a filter therein, and is provided with a gas outlet for ejecting gas to a peripheral wall of a portion defining the filter chamber A member,
The communication is located inside the cylindrical member and divides the space inside the cylindrical member in the axial direction into the combustion chamber and the filter chamber, and communicates the combustion chamber and the filter chamber in the center. A disc-shaped partition plate provided with holes;
An igniter positioned on the combustion chamber side when viewed from the partition plate;
A closing member that closes the opening end by inserting at least part of the opening end of the cylindrical member located on the filter chamber side when viewed from the partition plate;
The filter comprises a cylindrical member having a hollow opening extending in the same direction as the axial direction of the cylindrical member,
The closing member has a protruding portion that protrudes toward the filter chamber side from a central portion of a main surface of a portion that defines the filter chamber, and abuts against an inner peripheral surface of the filter, and the peripheral wall of the cylindrical member The first caulking portion provided by reducing the diameter of the peripheral wall of the cylindrical member toward the inner side in the radial direction is engaged with a groove provided on the peripheral surface opposed to the cylindrical member, thereby being fixed to the cylindrical member. ,
The peripheral edge of the partition plate is axially formed by the second caulking portion provided at a position sandwiching the partition plate by reducing the diameter of the peripheral wall of the cylindrical member inward in the radial direction. Fixed to the cylindrical member by being sandwiched in
One end portion of the filter in the axial direction is in a state where one end surface of the filter included in the one end portion is in contact with the closing member, and the protruding portion provided in the closing member is the hollow opening portion of the filter. Fixed to the closing member by being inserted into the
The other end portion of the filter in the axial direction is positioned on the filter chamber side of the pair of second caulking portions in a state where the other end surface of the filter included in the other end portion is in contact with the partition plate. It is fixed to the cylindrical member by being sandwiched radially inward by a caulking portion ,
The protruding portion provided on the blocking member has either a curved tapered shape at the tip or a tapered shape with a tapered tip at the periphery of the tip surface , Gas generator. The groove provided in the closing member is provided in an annular shape along a circumferential direction, and the first caulking portion provided in the cylindrical member has a radial direction in the peripheral wall of a portion corresponding to the groove. The cylindrical member is configured to be uniformly reduced in diameter toward the inside, whereby the closing member is crimped in eight directions without interposing a sealing member between the cylindrical member and the closing member. The gas generator according to claim 1, which is fixed to the gas generator. The gas generator according to claim 1 or 2 , wherein the protrusion provided on the closing member is press-fitted into the hollow opening of the filter. The axial length L of the filter and the axial length H of the portion of the protruding portion provided on the blocking member that contacts the inner peripheral surface of the filter are H ≧ 2 mm and 1/10 ≦ H / L ≦ The gas generator according to any one of claims 1 to 3 , wherein a quarter condition is satisfied. The gas generator according to any one of claims 1 to 4 , wherein a caulking portion located on the filter chamber side of the pair of second caulking portions is in pressure contact with an outer peripheral surface of the filter. The gas generator according to any one of claims 1 to 5 , wherein the closing member has a recess in an axial end surface on a side where the protrusion is not provided.

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