Gas generator

Abstract

To obtain a gas generator of which cost reduction is achieved by saving a weight and simplifying components compared to a conventional one.SOLUTION: A gas generator 100 having a long and substantially columnar outer shape includes: a housing 10; a holder 20 attached to one opening end of the housing 10; a blocking member 12 which is attached to the other end part of the housing 10 so as to block the other open end of the housing 10; a cylindrical closed container 34 (cylindrical member) including a gas generating agent 31; a filter 41 which collects residue of a gas generated; and a partition member 36 provided between the filter 41 and the closed container 34. The partition member 36 comprises a first cylindrical part, an annular contact part, and a second cylindrical part. The first cylindrical part has an inner diameter larger than an inner diameter of the filter 41, and an opening is formed at an end part thereof on an igniter 50 side. The end part of the first cylindrical part on the igniter 50 side contacts an end part of the closed container 34 so that an opening of the first cylindrical part faces the end part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted on an automobile or the like, and more particularly to a so-called cylinder-type gas generator having an elongated cylindrical shape. [Background technology]

[0002] Conventionally, gas generators have been known that include a sealed container that contains a gas generating agent and is in contact with one end of a filter via a thin partition plate (with a hole in the center) within a long cylindrical housing (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5455932 Summary of the Invention [Problem to be solved by the invention]

[0004] In gas generators such as those in Patent Document 1, the rupture strength (burst pressure) of the filter side end of the sealed container and the size of the flow path in the filter for the generated gas (hereinafter, flow path size) both depend on the inner diameter of the filter or the inner diameter of the hole in the center of the partition plate. That is, in the past, it was not possible to design the rupture strength of the filter side end of the sealed container and the flow path size separately. Therefore, in the past, it was not easy to fine-tune the performance of the gas generator, including the collection of residue by the filter.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a gas generator in which the rupture strength of the filter side end of the sealed container and the flow path size can be designed separately, making it easier to fine-tune performance than in the past. [Means for solving the problem]

[0006] (1) A gas generator of the present invention comprises a long housing, an igniter provided at one end of the housing for igniting a gas generating agent, a filter provided on the other end side of the housing, a cylindrical member provided inside the housing between the igniter and the filter and containing the gas generating agent, a first cylindrical portion provided inside the housing between the cylindrical member and the filter and having an opening formed at an end portion on the igniter side, and an annular abutment portion provided on the filter side of the first cylindrical portion and abutting against the end portion of the filter on the igniter side; an internal space formed between the cylindrical member and the filter by the first cylindrical portion and the abutment portion; the first cylindrical portion has an inner diameter larger than the inner diameter of the filter, the opening abuts against the end of the cylindrical member on the filter side, and a hole is formed in the center of the abutting portion.

[0007] (2) In the gas generator of (1) above, it is preferable that the partition member further includes a second cylindrical portion extending from an inner peripheral edge of the hole and having an outer diameter equal to or smaller than the inner diameter of the filter, and that the second cylindrical portion is inserted inside the filter.

[0008] (3) From another viewpoint, in the gas generator of (1) above, the abutment portion may be extended from the first cylindrical portion, have a cross section that tapers in diameter from the first cylindrical portion side to the filter side, and have at least a portion inserted inside the filter. Effect of the Invention

[0009] According to the present invention, the cleavage strength of the filter side end of the sealed container and the flow path size can be designed separately, making it possible to provide a gas generator whose performance can be easily adjusted. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a schematic diagram (partially omitted) showing a cross-sectional view of the internal structure of the gas generator according to the embodiment of the present invention. [Diagram 2]2 is an enlarged schematic view showing the partition member and its surroundings in FIG. 1. FIG. [Diagram 3] 13 is an enlarged schematic view showing the vicinity of a partition member of a gas generator according to a modified example. FIG. [Figure 4] FIG. 11 is a schematic cross-sectional view showing a housing used in a gas generator according to another modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, with reference to FIG. 1, the internal structure of a cylindrical gas generator according to an embodiment of the present invention will be described.

[0012] (Configuration of gas generator 100) Gas generator 100 has a long, approximately cylindrical outer shape, and includes a housing 10, a holder 20 attached to one open end of housing 10, a blocking member 12 attached to the other end of housing 10 so as to block the other open end of housing 10, a cylindrical sealed container 34 (cylindrical member) containing gas generating agent 31, a filter 41 that collects residue of the generated gas, and a partition member 36 provided between filter 41 and sealed container 34.

[0013] Housing 10 has peripheral walls 10a, 10e and is made of a long cylindrical member having openings at both axial ends. Closing member 12 has an annular groove portion 13 formed in the peripheral surface of closing member 12 so as to extend in the circumferential direction. In addition, gas outlets 11 are provided in the peripheral wall near the end of housing 10 on the side where closing member 12 is attached. Gas outlets 11 are holes for ejecting gas generated inside gas generator 100 to the outside, and a plurality of gas outlets 11 are provided along the circumferential and axial directions of housing 10.

[0014] The blocking member 12 is made of a metal such as stainless steel, iron steel, aluminum alloy, or stainless alloy. As shown in Fig. 1, with a part of the blocking member 12 inserted into one open end of the housing 10, a part of the peripheral wall 10a of the housing 10 corresponding to the annular groove 13 on the peripheral surface of the blocking member 12 is reduced inward in the radial direction (crimped) to engage with the annular groove 13, thereby crimping and fixing the blocking member 12 to the housing 10.

[0015] The holder 20 is made of a metal such as stainless steel, iron steel, an aluminum alloy, or a stainless alloy, and has a tapered fitting portion 23 into which the igniter 50 fits, an annular groove portion 22 for crimping and fixing formed so as to extend in the circumferential direction on the outer circumferential surface, and a fitting portion 21 into which a female connector (not shown) for supplying electricity to the igniter 50 can be fitted, on the side opposite to the holding position of the igniter 50. Note that the holder 20 is crimped and fixed to the housing 10 by reducing (crimping) the diameter of the peripheral wall 10e of the housing 10 in a portion corresponding to the annular groove portion 22 provided on the outer circumferential surface of the holder 20 inward in the radial direction and engaging the annular groove portion 22.

[0016] As described above, a female connector is formed in the fitting portion 21 of the holder 20. This female connector is a portion to which a male connector of a harness that transmits a signal from a collision detection means provided separately from the gas generator 100 is connected. A retainer (not shown) is attached to the female connector. This retainer is attached to prevent the cylindrical gas generator 100 from malfunctioning due to electrostatic discharge or the like during transportation of the gas generator 100, and contact with the terminal pin 52 is released when the male connector of the harness is inserted into the female connector at the stage of assembly into the airbag device.

[0017] 1, an igniter 50 is disposed at one axial end of the housing 10 (i.e., the portion close to the holder 20) as an ignition means for the gas generating agent 31. The igniter 50 and the holder 20 to which the igniter 50 is fixed function as an ignition means for generating a flame for burning the granular gas generating agent 31, which will be described later.

[0018] As shown in Fig. 1, the igniter 50 is inserted into the fitting portion 23 of the holder 20 and held together with a substantially cylindrical member 53, which will be described later. More specifically, the igniter 50 includes a base frame through which a pair of terminal pins 52 are inserted and held, and a squib cup 51 (cup-shaped member) attached to the base frame, and a resistor (bridge wire) is attached so as to connect the tips of the terminal pins 52 inserted into the squib cup 51, and an ignition charge is filled in the squib cup 51 so as to surround or come into contact with the resistor. A 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 ignition charge. In addition to the ignition charge, a transfer charge may be filled into the squib cup 51. Examples of transfer charges that may be placed at the same time as the ignition charge include a composition made of a metal / oxidizer, such as boron / potassium nitrate, a composition made of titanium hydride / potassium perchlorate, or a composition made of boron / 5-aminotetrazole / potassium nitrate / molybdenum trioxide.

[0019] When a collision is detected, a predetermined amount of current flows through the resistor via terminal pin 52. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition charge begins to burn in response to this heat. The high-temperature flame generated by the combustion explodes squib cup 51 containing the ignition charge. The time from when the current flows through the resistor to when the igniter 50 is activated is 2 milliseconds or less when nichrome wire is used for the resistor.

[0020] Moreover, the squib cup 51 is generally made of metal or resin. An approximately cylindrical member 53, which covers the peripheral wall of the squib cup 51 except for the vicinity of the tip, is fixed to the holder 20 by crimping together with the igniter 50 by crimping the crimping portion 24. The approximately cylindrical member 53 is a directional member that directs the direction of the flame generated in the igniter 50 toward the sealed container 34 upon activation. A coil spring 54 is provided around the squib cup 51 and the approximately cylindrical member 53 along the inner wall of the housing 10. One end of this coil spring 54 abuts against an end of a lid portion 34b of the sealed container 34, which will be described later, and the other end abuts against an end on the inner side of the holder 20.

[0021] 1, a cylindrical sealed container 34 in which a gas generating agent 31 and the like are sealed, and a filter 41 are loaded in the internal space of the housing 10 in parallel in the axial direction of the housing 10. The sealed container 34 is preferably made of a metal such as aluminum.

[0022] The sealed container 34 has a bottomed cylindrical portion 34a and a lid portion 34b, and the gas generating agent 31, the coil spring 35, the AI ​​agent 32, the cover member 33, and the partition member 36 are disposed inside. The bottomed cylindrical portion 34a has an end portion 34c that serves as the bottom. The lid portion 34b and the tip of the igniter 50 are disposed at a predetermined distance from each other. This makes it easier for the squib cup 51 to split open when the igniter 50 is activated. The end portion 34c can also be adjusted to either burst or split open when activated by changing the thickness and / or material.

[0023] The gas generating agent 31 is an integrally molded product that is ignited by a flame generated by ignition by the igniter 50 and burns to generate gas. The gas generating agent 31 is generally formed as a molded product containing a fuel, an oxidizer, 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, or the like is preferably used. As the oxidizer, for example, a basic metal hydroxide such as basic copper nitrate or basic copper carbonate, a perchlorate such as ammonium perchlorate or potassium perchlorate, an alkali metal, an alkaline earth metal, a transition metal, a nitrate containing a cation selected from ammonia, or the like is used. As the nitrate, for example, sodium nitrate, potassium nitrate, or the like is preferably used. As the additive, a binder, a slag forming agent, a combustion adjusting agent, or the like is used. Suitable binders include organic binders such as cellulose derivatives such as hydroxypropylene methylcellulose, metal salts of carboxymethylcellulose, and stearates, and inorganic binders such as synthetic hydroxytalcite and acid clay.Slag formers include silicon nitride, silica, and acid clay.Furthermore, suitable combustion regulators include metal oxides, ferrosilicon, activated carbon, and graphite.

[0024] As shown in Fig. 1, the coil spring 35 is formed by winding in a spiral shape so that the overall appearance resembles a truncated cone shape. The coil spring 35 is provided so that one end abuts against the lid portion 34b and the other end formed in a spiral shape abuts against the gas generating agent 31 to apply an elastic force to the gas generating agent 31. Due to this bias, the gas generating agent 31 is fixed in the sealed container 34 so as to be sandwiched between the coil spring 35, the end of the filter 41 on the coil spring 35 side, and the bottom of the bottomed tubular portion 34a. The coil spring 35 is generally formed in a truncated cone shape from the igniter 50 side to the gas generating agent 31 side, so that the direction of the flame emitted from the igniter 50 can be easily directed toward the gas generating agent 31 side.

[0025] The AI ​​agent 32 has an auto-ignition (AI) function that automatically ignites without the operation of the igniter 50. Explaining in more detail, the AI ​​agent 32 automatically ignites at a lower temperature than the gas generating agent 31, and therefore, in the unlikely event of a fire or the like occurring in a vehicle or the like equipped with an airbag device or the like in which the gas generator 100 is incorporated, it is possible to prevent the induction of abnormal operation of the gas generator 100 due to external heating. In addition, a cover member 33 that holds the AI ​​agent 32 is hermetically housed in the bottom of the sealed container 34 on the closing member 12 side. The cover member 33 is provided with a plurality of holes.

[0026] As shown in FIG. 2, the partition member 36 includes a first cylindrical portion 36a, an abutment portion 36b, and a second cylindrical portion 36c. The first cylindrical portion 36a has an inner diameter larger than the inner diameter of the filter 41, and an opening is formed at the end portion on the igniter 50 side. In addition, the end portion on the igniter 50 side of the first cylindrical portion 36a abuts against the end portion 34c of the sealed container 34 so that the opening portion of the first cylindrical portion 36a faces the end portion 34c. The abutment portion 36b is provided on the filter 41 side of the first cylindrical portion 36a and is annular in shape abutting against the end portion on the igniter 50 side of the filter 41. In addition, the abutment portion 36b has a curved portion 36b1 for forming a hole in the center portion continuously provided in the circumferential direction. First cylindrical portion 36a and abutment portion 36b can ensure a sufficient operating space between filter 41 and sealed container 34 when end 34c of sealed container 34 ruptures or splits open during operation of gas generator 100. Furthermore, during operation of gas generator 100, end 34c of sealed container 34 ruptures or splits open with stress concentrated at position 34c1. Therefore, end 34c of sealed container 34 can be smoothly ruptured or split open during operation of gas generator 100.

[0027] Second cylindrical portion 36c is provided extending from curved portion 36b1 of abutment portion 36b so as to be inserted into filter 41. Moreover, the outer diameter of second cylindrical portion 36c is equal to or smaller than the inner diameter of filter 41. This makes it easy to fit second cylindrical portion 36c into filter 41, facilitating positioning of partition member 36 during manufacture of gas generator 100. Therefore, gas generator 100 that is relatively easy to manufacture can be provided. Moreover, second cylindrical portion 36c can protect the end of filter 41 from breakage and / or rupture of end 34c of sealed container 34 during operation.

[0028] Further, the outer peripheral wall of the first cylindrical portion 36a of the partition member 36 is disposed so as to abut against the inner wall of the housing 10, and the abutting portion 36b is disposed so as to cover the end of the filter 41. This prevents the generated gas from bypassing between the inner wall of the housing 10 and the outer peripheral portion of the filter 41 and leaking out to the gas outlet 11. In other words, the partition member 36 allows the gas generated on the sealed container 34 side to flow into the filter 41 side via the second cylindrical portion 36c.

[0029] The filter 41 is made of a cylindrical member having a substantially cylindrical hollow portion 41a at the center. By using the filter 41 made of the cylindrical member described above, the flow resistance of the working gas flowing during operation is kept low, and efficient gas flow is possible. The filter 41 is made of, for example, wire material made of metal such as stainless steel or steel, or a net material wound or pressed. Specifically, a knitted wire mesh, a plain woven wire mesh, or an assembly of crimped woven metal wires is used. The filter 41 functions as a cooling means for cooling the gas by removing the high temperature heat of the gas when the gas generated in the sealed container 34 passes through the filter 41, and also functions as a removal means for removing slag and the like contained in the gas. Here, as a modified example of the filter 41, a filter having a labyrinth-like flow path formed by combining substantially cylindrical or mortar-shaped parts made of metal may be used. This allows the working gas to be redirected in various directions, thereby allowing the gas to be cooled and slag to be removed.

[0030] In the above-mentioned embodiment of the present invention, a filter made of a so-called knitted wire mesh is used as an example, but instead of this, a filter made by winding a punched metal or a filter made by winding an expanded metal can be used. Here, the punched metal is a metal plate in which only openings are provided in a plate-shaped metal member (i.e., no protrusions are provided around the openings), and the expanded metal is a metal plate in which openings are provided in the plate-shaped metal member by, for example, making staggered cuts in the plate-shaped metal member and expanding the cuts to form a mesh-like shape. Even when such a punched metal or expanded metal is used instead of the knitted wire mesh, the same effects as those described in the above-mentioned embodiment of the present invention can be obtained.

[0031] In the above-mentioned punched metal and expanded metal, the filter is made of a laminate by winding a single metal plate-like member, but the configuration of the filter is not limited to this. That is, the filter may be made of a laminate by combining different metal plate-like members in each layer, or the filter may be made of a laminate by winding some of the layers by winding a single metal plate-like member and combining the remaining layers by winding another single metal plate-like member.

[0032] Next, the operation of the gas generator 100 during activation described above will be described. When a vehicle equipped with an airbag device incorporating the gas generator 100 of this embodiment collides, the collision is detected by collision detection means separately provided in the vehicle, and the igniter 50 is activated based on this detection. When the igniter 50 is activated, the pressure inside the igniter 50 increases due to combustion of the ignition charge, causing the tip of the squib cup 51 of the igniter 50 to burst, and the flame flows from the tip of the squib cup 51 of the igniter 50 to the side of the sealed container 34 inside the housing 10.

[0033] The flame thus flowing in ruptures the lid 34b of the sealed container 34, and further ignites and burns the gas generating agent 31 in the sealed container 34, generating a large amount of gas. This combustion of the gas generating agent 31 increases the pressure in the sealed container 34, and the generated gas causes stress to be concentrated at the position 34c1. Then, when the pressure in the sealed container 34 reaches a predetermined level or higher, the gas generated in the sealed container 34 ruptures or breaks the end 34c of the sealed container 34 on the closing member 12 side, and flows into the hollow portion 41a through the inside of the partition member 36. Thereafter, the generated gas is ejected from the gas ejection port 11 to the outside of the gas generator 100 via the filter 41, but since the gas passes through the filter 41, the generated gas is cooled to a predetermined temperature. Then, the gas ejected from the gas ejection port 11 is guided into the inside of the airbag to inflate and deploy the airbag.

[0034] (Main features of the gas generator 100) According to the present embodiment, the formation of the internal space by the first cylindrical portion 36a of the partition member 36 and the inner diameter of the filter 41 can be designed separately, and therefore the rupture strength of the end portion 34c on the filter side of the sealed container 34 and the flow path size (the inner diameter of the filter 41) can be designed separately. That is, the portion of the end portion 34c of the sealed container 34 where stress is concentrated can be easily adjusted by the thickness and the size of the inner diameter of the first cylindrical portion 36a of the partition member 36, and the size of the inner diameter of the filter 41 can be easily adjusted separately. Also, by appropriately changing the thickness of the end portion 34c of the sealed container 34, the design of the rupture strength of the end portion 34c can be adjusted more easily than in the past. Therefore, it is possible to provide a gas generator 100 in which fine adjustment of performance is easier than in the past. That is, for example, the internal pressure in the sealed container 34 during operation can be adjusted more easily than in the past (for example, reduced more easily than in the past). Furthermore, the inner diameter of filter 41 can be made smaller than before without changing the length of housing 10 (the radial thickness of filter 41 can be made thicker than before), so that a gas generator 100 can be provided that can improve the residue collection ability of filter 41 compared to before while maintaining the same size as before.

[0035] In addition, by changing the thickness and / or material of the end portion 34c, it is possible to adjust so that either rupture or splitting occurs upon activation.

[0036] Furthermore, because second cylindrical portion 36c can be easily fitted into filter 41, partition member 36 can be easily positioned during manufacture of gas generator 100. Therefore, gas generator 100 that is relatively easy to manufacture can be provided.

[0037] Furthermore, the partition member 36 can protect the end of the filter 41 from breakage and / or rupture of the end 34c of the sealed container 34 during operation.

[0038] Although the embodiments of the present invention have been described above based on the drawings, the specific configuration should not be considered to be limited to these embodiments. The scope of the present invention is indicated by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims.

[0039] For example, a modified example of the above embodiment may be a gas generator having the configuration shown in Fig. 3. A specific description will be given below, but parts similar to those in the above embodiment will be given reference numerals with the same last two digits and description may be omitted. In this modified example, parts that are not particularly described are similar to those in the above embodiment.

[0040] The gas generator of this modified example differs in that a partition member 136 and a filter 141 are used instead of the partition member 36 and the filter 41 of the above embodiment.

[0041] As shown in Fig. 3, the partition member 136 includes a first cylindrical portion 136a, an abutment portion 136b, and a second cylindrical portion 136c. The first cylindrical portion 136a has an inner diameter larger than the inner diameter of the filter 141, and an opening is formed at the end portion on the igniter side. The end portion on the igniter side of the first cylindrical portion 136a abuts against the end portion 134c of the sealed container 134 so that the opening portion of the first cylindrical portion 136a faces the end portion 134c. The abutment portion 136b is provided on the filter 141 side of the first cylindrical portion 136a, abuts against the end portion on the igniter side of the filter 141, and has a tapered shape (annular) in cross section that decreases in diameter from the first cylindrical portion 136a side to the filter 141 side. These first cylindrical portion 136a and abutment portion 136b can ensure a sufficient operating space between filter 141 and sealed container 134 when end 134c of sealed container 134 ruptures or splits open during operation of the gas generator of this modified example. Furthermore, during operation of the gas generator of this modified example, end 134c of sealed container 134 ruptures or splits open with stress concentrated at position 134c1. Therefore, the rupture or splitting of end 134c of sealed container 134 can be performed smoothly during operation of the gas generator of this modified example.

[0042] The second cylindrical portion 136c is formed continuously and integrally with the abutting portion 136b, and is provided so as to be located inside the hollow portion 141a of the filter 141.

[0043] According to the gas generator of this modified example, it is possible to achieve the same effects as those of the above embodiment.

[0044] As another modification, the partition member 36 in the above embodiment may have only the first cylindrical portion 36a and the abutment portion 36b, without providing the second cylindrical portion 36c.

[0045] As another modification, instead of the housing in the above embodiment or modification, the housing 210 shown in FIG. 4 (a housing precursor before a holder or the like is crimped and fixed) may be used. This housing 210 has two types of gas outlets 211a and 211b with different diameters, and is provided at a position facing a filter (not shown) as in the above embodiment or modification. The housing 210 also has an area A where a plurality of gas outlets 211a are provided, and an area B where a plurality of gas outlets 211b are provided. Also, by making the gas outlet 211b on the igniter side (lower side of the paper in FIG. 4) have a smaller diameter than the diameter of the gas outlet 211a, it is possible to make full use of the filter (not shown) similar to the above embodiment or modification provided inside the gas outlets 211a and 211b.

[0046] In addition, in the above embodiment and modified examples, the method of reducing the diameter of the housing has been described by taking crimping as an example, but any processing method that can reduce the diameter of the housing may be used. [Explanation of symbols]

[0047] 10, 110, 210 Housing 10a Peripheral wall 10e Surrounding wall 11, 211a, 211b Gas outlet 12 Closure member 13 Annular groove 20 Holder 21 Fitting part 22 Annular groove 23 Fitting part 24 Crimping part 31, 131 Gas generator 32, 132 AI agents 33, 133 Cover member 34, 134 Airtight containers 34a, 134a Bottomed cylindrical part 34b Lid 34c, 134c end 35 coil spring 36, 136 Partition member 36a, 136a First cylindrical portion 36b, 136b Contact part 36b1 Curved section 36c, 136c Second cylindrical part 41, 141 Filter 41a, 141a Hollow part 50 igniter 51 Squib Cup 52 terminal pins 53 Cylindrical member 54 Coil spring 100 Gas Generator

Claims

1. An elongated housing; an igniter provided at one end of the housing for igniting the gas generating agent; a filter provided on the other end side of the housing; a cylindrical member provided inside the housing between the igniter and the filter, the cylindrical member containing the gas generating agent; a partition member including a first cylindrical portion provided inside the housing between the cylindrical member and the filter, the first cylindrical portion having an opening formed at an end portion on the igniter side, an annular abutment portion provided on the filter side of the first cylindrical portion and abutting against the end portion of the filter on the igniter side, and an internal space formed between the cylindrical member and the filter by the first cylindrical portion and the abutment portion; Equipped with the first cylindrical portion has an inner diameter larger than an inner diameter of the filter, and the opening portion abuts against an end portion of the cylindrical member on the filter side; A gas generator comprising: a hole formed in a center of the contact portion.

2. The partition member further includes a second cylindrical portion extending from an inner peripheral edge of the hole and having an outer diameter equal to or smaller than an inner diameter of the filter.

2. The gas generator according to claim 1, wherein the second cylindrical portion is inserted inside the filter.

3. 2. The gas generator according to claim 1, wherein the abutment portion extends from the first cylindrical portion, has a cross section that is tapered so that its diameter decreases from the first cylindrical portion side to the filter side, and at least a portion of the abutment portion is inserted into the inside of the filter.

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