JP6265855B2 - Gas generator - Google Patents

Description

  The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device installed in an automobile or the like, and more particularly to a gas generator having a long cylindrical outer shape.

  2. Description of the Related Art Conventionally, airbag devices, which are occupant protection devices, have been widely used from the viewpoint of protecting occupants such as automobiles. The airbag device is equipped for the purpose of protecting an occupant from an impact generated when a vehicle or the like collides, and the airbag is inflated and deployed instantaneously when the vehicle or the like collides, so that the occupant's body is deployed. It is something that catches. 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.

  Gas generators of various configurations exist based on specifications such as installation positions and outputs with respect to vehicles and the like. One of them is a so-called cylinder type gas generator. The cylinder type gas generator has a long cylindrical shape, and is suitably incorporated in a side airbag device, a passenger side airbag device, a curtain airbag device, a knee airbag device, a seat cushion airbag device, and the like. .

  Usually, in a cylinder-type gas generator, an igniter is installed at one end of the housing in the axial direction, and a combustion chamber containing a gas generating agent is provided in the central portion of the housing in the axial direction. A filter chamber containing a filter is provided at the other end, and a gas outlet is provided in a peripheral wall portion of the housing that defines the filter chamber. In the cylinder type gas generator configured in this way, in general, gas generated in the combustion chamber flows into the filter chamber to pass through the inside of the filter, and the gas after passing through the filter passes through the gas outlet. Will be ejected to the outside. As a gas generator having a long cylindrical outer shape, there is a so-called T-shaped gas generator other than the cylinder type gas generator.

  Here, as a cylinder type gas generator capable of improving the cooling efficiency of the gas generated in the combustion chamber, there is one disclosed in JP-A-11-245760 (Patent Document 1). The cylinder type gas generator disclosed in Patent Document 1 is configured so that the gas generated in the combustion chamber is once blown to the peripheral wall portion of the housing before flowing into the filter chamber.

  Specifically, in the cylinder type gas generator disclosed in Patent Document 1, a partition member that partitions the space inside the long, substantially cylindrical housing in the axial direction is provided inside the housing, and the partition member A wire mesh screen is installed coaxially with the housing in the space closer to the igniter, and a filter is installed in a space opposite to the side where the igniter is located when viewed from the partition member. The gas generating agent is accommodated in the portion located on the igniter side in the space inside the screen, and the cup-shaped member is located in the portion located on the filter side in the space inside the screen. is set up.

  With the configuration described above, the high-temperature gas generated by the combustion of the gas generating agent once moves toward the outside in the radial direction of the housing, passes through the screen, and is sprayed on the inner peripheral surface of the housing. Then, it flows into the inside of the cup-shaped member via the communication hole provided in the cup-shaped member, and then flows into the filter via the communication hole provided in the partition member. Therefore, the high-temperature gas generated in the combustion chamber is further cooled by the filter after being cooled by the housing having a relatively low temperature, so that the gas cooling efficiency is improved.

Japanese Patent Laid-Open No. 11-245760

  However, the configuration as disclosed in Patent Document 1 requires at least three members, that is, the partition member, the screen, and the cup-shaped member described above in order to partition the internal space of the housing, and the configuration is complicated. Therefore, the assembling work becomes complicated. In addition, when a gap is generated between the partition member and the cup-shaped member, the intended operation cannot be realized by passing the gas through the portion, so that the portion can be welded. The construction is inevitable, and the assembly work is very complicated in this respect.

  Therefore, the present invention has been made to solve the above-described problems, and provides a gas generator having a simple configuration capable of efficiently cooling a high-temperature gas generated by burning a gas generating agent. The purpose is to do.

  The gas generator based on this invention is provided with the housing, the igniter, the division member, and the partition part. The housing includes a combustion chamber containing a gas generating agent, a filter chamber containing a filter through which gas generated in the combustion chamber passes, and a gas passage chamber connecting the combustion chamber and the filter chamber. It consists of a long cylindrical member that is contained inside and closed at one end and the other end in the axial direction. The igniter is assembled to the one end of the housing. The partition member and the partition portion are located inside the housing and separate the combustion chamber, the filter chamber, and the gas passage chamber from each other. The partition member is disposed so that an axial direction thereof is substantially parallel to an axial direction of the housing, thereby a cylindrical portion that divides a space inside the housing in a radial direction, and the cylindrical portion The housing is erected radially outward from the axial end located on the other end side of the housing, and its outer peripheral edge abuts on the inner peripheral surface of the housing, so that the space inside the housing is axially And an annular portion that is partitioned. The partition portion is disposed inside the cylindrical portion, thereby partitioning the space inside the cylindrical portion in the axial direction. The combustion chamber is a space closer to the one end portion of the housing than the partition portion and includes at least a part of a space inside the cylindrical portion. The filter chamber includes a first space that is a space closer to the other end portion of the housing than an axial end portion on the side where the annular portion of the partition member is located, and the other of the housing than the partition portion. A second space which is a space on the end portion side and is a space inside the cylindrical portion. The gas passage chamber is a space outside the cylindrical portion, and includes a space on the one end portion side of the housing from an axial end portion on the side where the annular portion of the partition member is located. A first communication hole for communicating the combustion chamber and the gas passage chamber is provided in a portion of the cylindrical portion that divides the combustion chamber and the gas passage chamber. A second communication hole for communicating the gas passage chamber and the filter chamber is provided in a portion that divides the gas passage chamber and the filter chamber. A gas outlet for ejecting gas toward the outside of the housing is provided at a portion defining the first space of the housing. The filter includes a large portion having a relatively large outer shape in a cross section perpendicular to the axial direction of the housing, and a small portion having a relatively small outer shape in a cross section orthogonal to the axial direction of the housing. The filter is disposed in the filter chamber so that the large portion is located in the first space and the small portion reaches the second space.

  In the gas generator according to the present invention, a plurality of the second communication holes may be provided in a portion of the cylindrical portion that divides the gas passage chamber and the filter chamber. It is preferable that the small portion is located so as to face all of the plurality of second communication holes.

  In the gas generator based on the said invention, it is preferable that the front end surface located in the said one end part side of the said housing of the said small part is in contact with the said partition part.

  In the gas generator according to the present invention, the small portion is separated from the cylindrical portion so that the peripheral surface of the small portion and the inner peripheral surface of the cylindrical portion are not in contact with each other. Preferably it is located.

  In the gas generator according to the present invention, it is preferable that the annular portion is in contact with the large portion.

  In the gas generator according to the present invention, the partition member is preferably fixed to the housing by press-fitting the annular portion into the housing.

  The gas generator according to the present invention may further include a cup-shaped member in which the gas generating agent is housed and at least a part of the gas generating agent is inserted into the cylindrical portion. Alternatively, the partition portion may be constituted by a top wall portion located on the other end side of the housing of the cup-shaped member.

  In the gas generator according to the present invention, the partition portion may be constituted by a part of the partition member fixed to the cylindrical portion by being press-fitted into the cylindrical portion.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the gas generator of the simple structure which can cool efficiently the high temperature gas generated when the gas generating agent combusts.

It is the schematic of the cylinder type gas generator in Embodiment 1 of this invention. It is an expanded sectional view of the igniter vicinity of the cylinder type gas generator shown in FIG. It is an expanded sectional view of the filter vicinity of the cylinder type gas generator shown in FIG. FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 3. It is sectional drawing along the VV line shown in FIG. It is the figure which represented typically the flow of the gas at the time of the action | operation of the cylinder type gas generator shown in FIG. It is the schematic of the cylinder type gas generator in Embodiment 2 of this invention. It is an expanded sectional view of the igniter vicinity of the cylinder type gas generator shown in FIG. It is an expanded sectional view of the filter vicinity of the cylinder type gas generator shown in FIG. It is sectional drawing along the XX line shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below exemplifies a case where the present invention is applied to a cylinder type gas generator incorporated in a side airbag device. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic diagram of a cylinder type gas generator according to Embodiment 1 of the present invention. 2 and 3 are an enlarged sectional view in the vicinity of the igniter and an enlarged sectional view in the vicinity of the filter of the cylinder type gas generator shown in FIG. 1, respectively. 4 and 5 are sectional views taken along lines IV-IV and VV shown in FIG. 3, respectively. First, with reference to these FIG. 1 thru | or FIG. 5, the structure of 1 A of cylinder type gas generators in this Embodiment is demonstrated.

  As shown in FIGS. 1 to 3, the cylinder type gas generator 1 </ b> A in the present embodiment has a long cylindrical outer shape, and one end and the other end positioned in the axial direction are closed. It has a housing. The housing has a cylindrical body with a bottomed cylindrical shape that is closed on one side in the axial direction, having a peripheral wall portion 11 and a closed portion 12, and a through-hole 21a that extends along the same direction as the axial direction of the housing main body 10. And an igniter assembly 20A including the collar 21. The collar 21 has an annular groove portion 21b for caulking and fixing, which will be described later, at a predetermined position on the outer peripheral surface thereof. The annular groove portion 21b is formed on the outer peripheral surface of the collar 21 so as to extend along the circumferential direction. Yes.

  The igniter assembly 20 </ b> A is fixed to the housing body 10 so as to close the opening end of the housing body 10. Specifically, in a state where the igniter assembly 20A is inserted into the opening end of the housing main body 10, a portion of the housing corresponding to the annular groove 21b provided on the outer peripheral surface of the collar 21 of the igniter assembly 20A. The igniter assembly 20A is caulked and fixed to the housing main body 10 by reducing the diameter of the peripheral wall portion 11 of the main body 10 inward in the radial direction and engaging with the annular groove portion 21b. As a result, one end of the housing in the axial direction is constituted by the igniter assembly 20 </ b> A, and the other end of the housing in the axial direction is constituted by the closing portion 12 of the housing body 10.

  The caulking fixing is caulking fixing called eight-side caulking, in which the diameter of the peripheral wall portion 11 of the housing body 10 is reduced substantially uniformly toward the inside in the radial direction. By performing this caulking, the caulking portion 14 is provided on the peripheral wall portion 11 of the housing body 10, and the caulking portion 14 is in close contact with the annular groove portion 21b. This prevents a gap from being generated between the housing body 10 and the igniter assembly 20A.

  The housing body 10 may be made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy, or is formed into a bottomed cylindrical shape by pressing a rolled steel plate represented by SPCE. Even if it is constituted by a metal press-molded product made of metal or a metal molded product molded into a bottomed cylindrical shape by closing one of the axial ends of an electric resistance welded pipe represented by STKM Good. In particular, when the housing main body 10 is formed of a rolled steel plate press-formed product or an electric-welded tube molded product, the housing main body is cheaper and easier than using a metal member such as stainless steel or steel. 10 can be formed, and the weight can be significantly reduced. On the other hand, the collar 21 of the igniter assembly 20A is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.

  As shown in FIGS. 1 and 2, the igniter assembly 20 </ b> A includes an igniter 22, a holding portion 23 formed of a resin molding portion, and a seal member 24 in addition to the collar 21 described above. The igniter 22 is disposed in the penetrating portion 21 a of the collar 21, and the holding portion 23 is positioned so as to embed between the collar 21 and the igniter 22.

  The igniter 22 is for burning a gas generating agent 60 which will be described later, and is supported by the collar 21 via the holding portion 23 and is assembled to the above-described one end portion in the axial direction of the housing. More specifically, as shown in FIG. 2, the igniter 22 includes an igniter 22a and a pair of terminal pins 22b. The igniter 22a is connected to the pair of terminal pins 22b. A resistor (bridge wire) is attached to the igniter, and the ignition unit 22 is filled with an igniting agent so as to surround or be in contact with the resistor, and a transfer agent is also loaded as necessary.

Here, the resistance body is generally a nichrome wire or a resistance wire made of an alloy containing platinum and tungsten, and the igniting agent is generally ZPP (zirconium / potassium perchlorate) or ZWPP (zirconium / tungsten / peroxide). Potassium chlorate), lead tricynate, etc. are used, and as a transfer agent, a composition comprising metal powder / oxidizer represented by B / KNO ₃ , B / NaNO ₃ , Sr (NO ₃ ) _2, etc., hydrogen A composition comprising titanium fluoride / potassium perchlorate, a composition comprising B / 5-aminotetrazole / potassium nitrate / molybdenum trioxide, and the like are used. The squib cup that surrounds the ignition unit 22a 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 22b. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition agent starts burning. The high temperature flame generated by the combustion ruptures the squib cup containing the igniting agent. The time from when a current flows through the resistor until the igniter 22 is activated is generally 2 milliseconds or less when a nichrome wire is used as the resistor.

  The holding part 23 is formed by injection molding (more specifically, insert molding) using a mold, and an insulating fluid resin material is attached to the collar 21 and the igniter 22 to solidify it. Formed by. Here, the igniter 22 is disposed so as to be inserted into the penetrating portion 21a of the collar 21 when the holding portion 23 is molded, and in this state, a space between the collar 21 and the igniter 22 is provided. The fluid resin material described above is poured into the collar 21 so as to be filled through the holding portion 23.

  As a raw material of the holding part 23 formed by injection molding, a resin material excellent in heat resistance, durability, corrosion resistance, etc. after curing is suitably selected and used. In that case, it is not limited to a thermosetting resin typified by an epoxy resin or the like, but is typified by a polybutylene terephthalate resin, a polyethylene terephthalate resin, a polyamide resin (for example, nylon 6 or nylon 66), a polypropylene sulfide resin, or a polypropylene oxide resin. It is also possible to use a thermoplastic resin. When these thermoplastic resins are selected as raw materials, it is preferable to contain glass fibers or the like as fillers in these resin materials in order to ensure the mechanical strength of the holding portion 23 after molding. However, when sufficient mechanical strength can be ensured with only the thermoplastic resin, it is not necessary to add the filler as described above.

  The holding part 23 is formed so as to protrude not only in the through part 21a of the collar 21 but also toward both outer sides along the axial direction of the through part 21a. A pair of annular groove portions 23a and 23b are provided on the outer peripheral surface of the holding portion 23 at a portion protruding toward the side where the ignition portion 22a of the igniter 22 is located, and a terminal pin 22b of the igniter 22 is provided. A concave portion 23c is provided at the axial end of the holding portion 23 that protrudes toward the side where the is located.

  A seal member 24 made of an O-ring or the like is accommodated in the annular groove portion 23a, and a cup-like member 40 described later is caulked and fixed to the annular groove portion 23b. On the other hand, the recess 23c forms a female connector portion that receives a male connector (not shown) of a harness for connecting the igniter 22 and a control unit (not shown). The portion near the tip of the terminal pin 22b of the igniter 22 is exposed and positioned. A male connector is inserted into the recess 23c serving as the female connector, thereby realizing electrical continuity between the harness core wire and the terminal pin 22b.

  As shown in FIGS. 1 to 5, a hollow substantially cylindrical partition member 30 is disposed at a predetermined position in the space inside the housing. The partition member 30 has a cylindrical portion 31 disposed so that its axial direction is substantially parallel to the axial direction of the peripheral wall portion 11 of the housing, and the other end portion side of the housing of the cylindrical portion 31 described above (i.e., The flange-like annular portion 32 erected from the axial end located on the end of the housing where the closing portion 12 is located) radially outward, and the housing of the tubular portion 31 described above. And a skirt portion 33 formed so as to spread radially outward from one end portion side (that is, the end portion side of the housing where the igniter assembly 20A is located).

  The annular portion 32 is disposed so that the outer peripheral edge thereof is in contact with the inner peripheral surface of the peripheral wall portion 11 of the housing, and is located at a predetermined distance from the other end portion of the housing. On the other hand, the outer peripheral surface of the skirt portion 33 is disposed so as to contact the inner peripheral surface of the peripheral wall portion 11 of the housing, and is located at a predetermined distance from the above-described one end portion of the housing.

  The partition member 30 is fixed to the housing by press-fitting the annular portion 32 and the skirt portion 33 described above into the peripheral wall portion 11 of the housing. Thereby, the partition member 30 partitions the space inside the housing along the axial direction and the radial direction, and is configured not to move easily with respect to the housing.

  Here, as the partition member 30, for example, a metal plate-like member formed by pressing or the like is used, and preferably a steel plate such as ordinary steel or special steel (for example, a cold-rolled steel plate, A member made of a stainless steel plate or the like is used.

  As shown in FIGS. 1 to 3, a cup-shaped member 40 is inserted inside the tubular portion 31 of the partition member 30 from the above-described one end side of the housing. The cup-shaped member 40 is a bottomed substantially cylindrical member having a side wall portion 41 and a top wall portion 42, and the above-described igniter assembly 20A is inserted into the open end thereof.

  More specifically, a portion corresponding to the annular groove portion 23b provided in the holding portion 23 of the side wall portion 41 of the cup-like member 40 located near the opening end is reduced in diameter toward the radially inner side. By engaging with the annular groove 23b, a fixing portion 41a is provided on the side wall portion 41 of the cup-shaped member 40, whereby the cup-shaped member 40 is caulked and fixed to the igniter assembly 20A. In addition, as a result, the sealing member 24 accommodated in the annular groove 23a provided in the holding portion 23 described above is a portion of the side wall portion 41 and the holding portion 23 that are located near the opening end of the cup-shaped member 40. Therefore, airtightness in the portion is ensured.

  The cup-shaped member 40 has no opening in either the side wall portion 41 or the top wall portion 42, and in the state where the cup-shaped member 40 is fixed to the igniter assembly 20A, the space inside the cup-shaped member 40 is completely removed. It is sealed. The cup-shaped member 40 is ruptured or melted when the gas generating agent 60 is combusted by the operation of the igniter 22 with the increase in pressure or conduction of the generated heat. The material of the cup-shaped member 40 is a metal member formed by pressing a metal thin plate (foil) such as copper, aluminum, copper alloy, or aluminum alloy, or formed by performing injection molding or sheet molding. The resin member etc. which were made can be utilized.

  Here, the top wall portion 42 of the cup-shaped member 40 is configured to be disposed at an intermediate position in the axial direction of the tubular portion 31 of the partition member 30, and thus the top wall portion 42 is tubular. It is a partition part which partitions the space inside the part 31 in the axial direction. The top wall portion 42 serving as the partition portion is formed to be sufficiently thicker than the side wall portion 41 of the cup-shaped member 40, and further, an inclined surface that is inclined toward the side wall portion 41 side is formed on the outer peripheral edge portion thereof. Has been.

  As shown in FIGS. 1 to 4, a gas generating agent 60 and a cushion member 61 are accommodated in the cup-shaped member 40. More specifically, in the space inside the cup-shaped member 40, the gas generating agent 60 is loaded in the space located on the top wall portion 42 side, and the space on the side where the igniter assembly 20A is located. The cushion member 61 is disposed so as to be interposed between the igniter assembly 20 </ b> A and the gas generating agent 60.

  The gas generating agent 60 is a chemical that is ignited by the hot particles generated by the operation of the igniter 22 and burns to generate gas. As the gas generating agent 60, it is preferable to use a non-azide-based gas generating agent, and the gas generating agent 60 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. The oxidizing agent is selected from basic nitrates such as basic copper nitrate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, alkaline earth metals, transition metals, and ammonia. Nitrate containing cation is used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used. In addition, examples of the additive include a binder, a slag forming agent, and a combustion adjusting agent. As the binder, for example, an organic binder such as a metal salt of carboxymethyl cellulose or a stearate, or an inorganic binder such as synthetic hydroxytalcite or acidic clay can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Moreover, as a combustion regulator, a metal oxide, ferrosilicon, activated carbon, graphite, etc. can be used suitably.

  The shape of the molded body of the gas generating agent 60 includes various shapes such as a granular shape, a pellet shape, a granular shape such as a cylindrical shape, and a disk shape. In addition, in the cylindrical shape, a porous (for example, a single-hole cylindrical shape or a porous cylindrical shape) having a through hole inside the molded body is also used. These shapes are preferably selected as appropriate according to the specifications of the airbag apparatus in which the cylinder type gas generator 1A is incorporated. For example, the shape in which the gas generation rate changes with time during the combustion of the gas generating agent 60. 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 60, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear combustion rate, the pressure index, and the like of the gas generating agent 60.

  The cushion member 61 is provided for the purpose of preventing the gas generating agent 60 made of a molded body from being crushed by vibration or the like, and a spring portion 61a and a pressing portion formed by bending a metal wire. 61b. One end of the spring portion 61a is disposed so as to contact the holding portion 23 of the igniter assembly 20A, and a pressing portion 61b is formed at the other end. The pressing portion 61 b is configured by arranging metal wires substantially in parallel with a predetermined interval, and is in contact with the gas generating agent 60. As a result, the gas generating agent 60 is urged toward the top wall portion 42 of the cup-shaped member 40 by the cushion member 61, and is prevented from moving inside the cup-shaped member 40. Yes. In place of the cushion member 61 as described above, a cushion made of a ceramic fiber molded body, rock wool, foamed resin (for example, foamed silicone, foamed polypropylene, foamed polyethylene, etc.), rubber represented by chloroprene and EPDM, or the like. It is good also as using material.

  As shown in FIGS. 1, 3, and 5, in the internal space of the housing, the other end side of the housing described above rather than the partition member 30 (that is, the end side of the housing on which the closing portion 12 is located). ) And the second space S3B, which is the space inside the partition member 30 and the space on the other end side of the housing above the top wall portion 42 of the cup-shaped member 40. A filter 70A is disposed.

  The filter 70A functions as a cooling means for cooling the gas by taking away the high-temperature heat of the gas when the gas generated by the combustion of the gas generating agent 60 passes through the filter 70A. It also functions as a removing means for removing the residue (slag) and the like contained in. The filter 70A is, for example, one obtained by winding and sintering a metal wire such as stainless steel or steel, or one obtained by pressing a net material in which the metal wire is knitted and pressed. Here, as the net material, specifically, a knit metal mesh, a plain weave metal mesh, an assembly of crimped metal wires, or the like is used.

  The filter 70A has a large portion 71 whose outer shape in a cross section orthogonal to the axial direction of the housing is relatively large (that is, has a large diameter), and an external shape in a cross section that is orthogonal to the axial direction of the housing is relatively small (that is, has a diameter). A small cylindrical portion 72 and a substantially cylindrical outer shape, of which the large portion 71 is located on the other end side of the housing, and the small portion 72 is It is located on the above-mentioned one end side of the housing from the large portion 71.

  The large portion 71 of the filter 70A is accommodated in the first space S3A described above, and the small portion 72 of the filter 70A is positioned so as to reach the above-described second space S3B. Here, the diameter of the large portion 71 of the filter 70 </ b> A is configured to be larger than the inner diameter of the tubular portion 31 of the partition member 30, and the diameter of the small portion 72 of the filter 70 </ b> A is the tubular portion 31 of the partition member 30. It is comprised smaller than the internal diameter of. For this reason, the portion near the axial end on the side where the annular portion 32 of the partition member 30 is located is extrapolated to the small-sized portion 72 of the filter 70A, and the annular portion 32 is the above-described step shape of the filter 70A. Is in contact with the step surface (that is, the surface of the large portion 71 on the igniter 22 side). Further, the distal end surface of the small portion 72 of the filter 70 </ b> A is in contact with the top wall portion 42 of the cup-shaped member 40.

  As shown in FIGS. 1 to 5, a plurality of first communication holes 34 and second communication holes 35 are provided in the cylindrical portion 31 of the partition member 30 along the circumferential direction and the axial direction of the cylindrical portion 31, respectively. ing. The plurality of first communication holes 34 are arranged at the above-described one end side of the housing with respect to the top wall portion 42 of the cup-shaped member 40 disposed inside the partition member 30 (that is, the housing on which the igniter assembly 20A is located). The plurality of second communication holes 35 are located on the other end side of the housing described above (that is, the top wall portion 42 of the cup-shaped member 40 disposed inside the partition member 30). The end portion of the housing on which the closing portion 12 is located. The plurality of first communication holes 34 and the plurality of second communication holes 35 are all for allowing the gas generated by the combustion of the gas generating agent 60 to pass therethrough.

  The plurality of first communication holes 34 all face the side wall portion 41 of the cup-shaped member 40, and the plurality of second communication holes 35 all face the peripheral surface of the small portion 72 of the filter 70A. . Here, the small portion 72 of the filter 70A is disposed at a distance from the cylindrical portion 31 of the partition member 30, and thereby, the peripheral surface of the small portion 72 of the filter 70A and the inner periphery of the cylindrical portion 31 of the partition member 30. There is no contact with the surface. Therefore, a predetermined gap is also formed between the plurality of second communication holes 35 and the filter 70A.

  On the other hand, as shown in FIGS. 1 and 3, a plurality of gas outlets 13 are provided along the circumferential direction and the axial direction of the peripheral wall portion 11 in the peripheral wall portion 11 of the housing facing the filter 70 </ b> A. . The plurality of gas ejection ports 13 are for leading the gas after passing through the filter 70A to the outside of the housing.

  In the cylinder type gas generator 1A in the present embodiment described above, the space inside the housing is constituted by the partition member 30 and the top wall portion 42 as a partition portion which is a part of the cup-shaped member 40 described above. Is divided into the combustion chamber S1, the gas passage chamber S2, and the filter chamber S3, and the partition member 30 and the top wall portion 42 as a partition portion function as a pressure partition that separates the partitioned spaces from each other. It will be.

  Specifically, as shown in FIGS. 1 to 5, the above-mentioned one end side of the housing relative to the top wall portion 42 as the partitioning portion (that is, the end portion side of the housing where the igniter assembly 20A is located). ) And at least a part of the space radially inward of the cylindrical portion 31 of the partition member 30 functions as the combustion chamber S1 in which the gas generating agent 60 is accommodated. More specifically, the space defined by the cylindrical portion 31 and the skirt portion 33 of the partition member 30, the top wall portion 42 of the cup-shaped member 40, the peripheral wall portion 11 of the housing body 10, and the igniter assembly 20A. However, it functions as the combustion chamber S1.

  Further, the above-described space on the one end side of the housing is included in the space on the outer side in the radial direction than the cylindrical portion 31 of the partition member 30 and the axial end portion on the side where the annular portion 32 of the partition member 30 is located. The space functions as a gas passage chamber S2 that connects the combustion chamber S1 and the filter chamber S3. More specifically, a space defined by the cylindrical portion 31, the annular portion 32 and the skirt portion 33 of the partition member 30 and the peripheral wall portion 11 of the housing body 10 functions as the gas passage chamber S2.

  Further, the above-mentioned space that is the above-mentioned other end side of the housing than the axial end portion on the side where the annular portion 32 of the partition member 30 is located (that is, the end portion side of the housing on which the closing portion 12 is located). The second space which is the space on the other end side of the housing from the first space S3A and the top wall portion 42 as the partitioning portion, and is a space radially inward from the cylindrical portion 31 of the partition member 30. The space including the space S3B functions as the filter chamber S3 in which the filter 70A is accommodated. More specifically, the space defined by the cylindrical portion 31 and the annular portion 32 of the partition member 30, the top wall portion 42 of the cup-shaped member 40, and the peripheral wall portion 11 and the closing portion 12 of the housing body 10 is a filter. It will function as chamber S3.

  FIG. 6 is a diagram schematically showing a gas flow when the cylinder type gas generator shown in FIG. 1 is operated. Next, with reference to this FIG. 6, the operation | movement at the time of the action | operation of the cylinder type gas generator 1A in this Embodiment is demonstrated.

  When a vehicle equipped with the cylinder type gas generator 1A according to the present embodiment collides, a collision is detected by a collision detection means provided separately in the vehicle, and a control unit provided separately in the vehicle based on this is detected. The igniter 22 is actuated by energization from.

  As shown in FIG. 6, the gas generating agent 60 accommodated in the cup-shaped member 40 is ignited and burned by a flame generated by the operation of the igniter 22 to generate a large amount of gas. Along with this, the pressure and temperature inside the cup-shaped member 40 are increased, and the side wall 41 of the cup-shaped member 40 is ruptured or melted.

  As a result, the combustion chamber S1 and the gas passage chamber S2 are in communication with each other through the first communication hole 34, and the gas generated in the combustion chamber S1 is transferred to the gas passage chamber S2 through the first communication hole 34. And flow into. At that time, the gas flowing into the gas passage chamber S2 is blown to the inner peripheral surface of the peripheral wall portion 11 of the housing body 10 along the radial direction of the housing, and in this case, the slag contained in the gas is the peripheral wall. A considerable amount is removed by adhering to the inner peripheral surface of the portion 11.

  The gas blown to the inner peripheral surface of the peripheral wall portion 11 of the housing body 10 then flows in the gas passage chamber S2 along the axial direction of the housing. At that time, the gas is brought into contact with the peripheral wall portion 11 of the housing body 10 so that the heat is removed and the gas is cooled. Thereafter, the gas flowing in the gas passage chamber S2 flows into the filter chamber S3 through the second communication hole 35.

  The gas that has flowed into the filter chamber S3 passes through the inside of the filter 70A, and at that time, heat is further removed by the filter 70A to be cooled, and slag contained in the gas is further removed by the filter 70A. The gas after passing through the filter 70 </ b> A is ejected to the outside of the housing through the gas ejection port 13. The jetted gas is introduced into an airbag provided adjacent to the cylinder type gas generator 1A, and the airbag is inflated and deployed.

  In the cylinder-type gas generator 1A in the present embodiment described above, as described above, a total of two parts, that is, the partition member 30 and the top wall portion 42 as a partition portion that is a part of the cup-shaped member 40, are provided. Only by this, the space inside the housing can be partitioned into the combustion chamber S1, the gas passage chamber S2, and the filter chamber S3. Therefore, it is possible to obtain high cooling efficiency with a very simple configuration, and it is possible to provide a high-performance cylinder type gas generator at low cost. Further, by providing the gas passage chamber S2, the gas generated in the combustion chamber S1 can be introduced more smoothly and efficiently into the filter chamber S3. In this sense as well, a high performance cylinder type gas generator is provided. be able to.

  In particular, even if welding or the like is not performed between the partition member 30 and the top wall portion 42 and between the partition member 30 and the housing, there is no gap between them and gas does not leak out. The intended operation can be realized stably without complicating the work.

  Here, the reason why the gap does not occur between the partition member 30 and the top wall portion 42 is that the top wall portion 42 is formed to be sufficiently thick as described above, and the side wall continues to the top wall portion 42. This is because the portion 41 is provided. In addition, as shown in the drawing, if an inclined surface that is inclined toward the side wall 41 is formed on the outer peripheral edge of the top wall 42, pressure is applied to the inclined surface in response to an increase in the internal pressure of the combustion chamber S1. By acting, the top wall portion 42 is in close contact with the inner peripheral surface of the cylindrical portion 31 of the partition member 30, so that no gap is generated, and gas leakage can be prevented more reliably. Since the small portion 72 of the filter 70A is positioned in the second space S3B of the filter chamber S3, the top wall portion 42 comes into contact with the tip surface of the small portion 72 of the filter 70A, so that the top wall portion 42 is Even if the pressure rise in the combustion chamber S1 is received, it does not move any further, and in this respect as well, the generation of a gap between the partition member 30 and the top wall portion 42 can be prevented more reliably.

  On the other hand, the reason why the gap does not occur between the partition member 30 and the housing is that the annular portion 32 and the skirt portion 33 of the partition member 30 are press-fitted and fixed to the housing. This is because the movement of the partition member 30 along the axial direction of the housing is prevented because 32 is in contact with the large portion 71 of the filter 70A.

  Further, in the cylinder type gas generator 1A in the present embodiment, the annular portion 32 of the partition member 30 is abutted against the large portion 71 of the filter 70A, and the top wall portion 42 of the cup-shaped member 40 is used. Is attached to the small portion 72 of the filter 70A, so that positioning of these parts can be performed relatively easily during manufacturing, and the merit that the assembling work is facilitated also in this respect can be obtained. . However, these attachments are not necessarily indispensable configurations, and may naturally be configured such that a gap is generated between them.

  Further, in the cylinder type gas generator 1A in the present embodiment, a partition portion that partitions the combustion chamber S1 and the filter chamber S3 is configured by the top wall portion 42 that is a part of the cup-shaped member 40. In addition to the cup-shaped member, there is no need to provide a separate partition portion. In this respect as well, the number of parts can be reduced, and the manufacturing cost can be reduced.

  Further, in the cylinder type gas generator 1A according to the present embodiment, as described above, a predetermined gap is formed between the plurality of second communication holes 35 and the filter 70A. Is retained, and gas flows into the filter 70A from the entire side surface of the small portion 72 of the filter 70A. Therefore, compared with the case where the gap is not provided, the effective volume of the filter 70A contributing to gas cooling and slag removal can be increased, and the utilization efficiency of the filter 70A can be increased. Therefore, also in this respect, the gas cooling efficiency can be improved, and further, the filter 70A can be reduced in size.

  In the above-described cylinder type gas generator 1A according to the present embodiment, a case where all the plurality of second communication holes 35 are configured to face the small portion 72 of the filter 70A is illustrated, but not necessarily. It is not necessary to configure as such, and the small portion 72 of the filter 70A is configured to reach the above-described second space S3B to the extent that it faces at least one of the plurality of second communication holes 35. That's fine. If comprised in this way, it can contribute to the improvement of the cooling efficiency of 70 A of filters not a little.

(Embodiment 2)
FIG. 7 is a schematic view of a cylinder type gas generator in Embodiment 2 of the present invention. 8 and 9 are an enlarged sectional view in the vicinity of the igniter and an enlarged sectional view in the vicinity of the filter of the cylinder type gas generator shown in FIG. 7, respectively. FIG. 10 is a cross-sectional view taken along line XX shown in FIG. Hereinafter, with reference to these FIG. 7 thru | or FIG. 10, the cylinder type gas generator 1B in this Embodiment is demonstrated.

  As shown in FIGS. 7 to 10, the cylinder type gas generator 1B in the present embodiment is different from the cylinder type gas generator 1A in the first embodiment described above in that the igniter assembly 20B has a different configuration. The configuration is mainly different in that it includes a partition member 50 instead of the cup-shaped member, and a filter 70B having a different configuration.

  Specifically, as shown in FIGS. 7 and 8, the igniter assembly 20 </ b> B includes an igniter 22, a holder 25, and a pair of seal members 26 and 27.

  The holder 25 is made of a cylindrical member having a through portion 25a extending in the same direction as the axial direction of the housing body 10, and is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. Yes. The holder 25 has a caulking portion 25b for caulking and fixing the igniter 22, which will be described later, at an end portion facing the space inside the housing. The holder 25 has an annular groove 25c for caulking and fixing the housing body 10 at a predetermined position on the outer peripheral surface thereof, and the annular groove 25c extends along the circumferential direction on the outer peripheral surface of the holder 25. Is formed. Furthermore, another annular groove portion 25d different from the above-described annular groove portion 25c is provided on the outer peripheral surface of the holder 25. In addition, a recessed portion 25e serving as the female connector portion described above is provided in a portion exposed to the outside of the holder 25.

  The igniter assembly 20 </ b> B is fixed to the housing body 10 so as to close the open end of the housing body 10. Specifically, in a state where a part of the igniter assembly 20B is inserted into the opening end of the housing body 10, it corresponds to the annular groove portion 25c provided on the outer peripheral surface of the holder 25 of the igniter assembly 20B. The igniter assembly 20 </ b> B is caulked and fixed to the housing body 10 by reducing the diameter of the peripheral wall portion 11 of the housing main body 10 toward the inside in the radial direction and engaging with the annular groove 25 c. Thereby, the one end part of the axial direction of a housing is comprised by the igniter assembly 20B. The other end of the housing in the axial direction is constituted by a closing portion 12 of the housing body 10.

  Further, the igniter 22 is inserted into the penetrating portion 25a of the holder 25 and fixed by caulking. More specifically, the igniter 22 is clamped by the holder 25 and fixed by caulking the above-described caulking portion 25b in a state where the igniter 22 is inserted into the through portion 25a and is fixed to the holder 25. Yes.

  A seal member 26 made of an O-ring or the like is accommodated in the annular groove 25d. Thereby, the sealing member 26 accommodated in the annular groove part 25d provided in the holder 25 will be pinched | interposed by the said holder 25 and the surrounding wall part 11 of the housing main body 10, and the airtightness in the said part is ensured. It will be.

  Further, a seal member 27 made of an O-ring or the like is interposed between the igniter 22 and the holder 25. The seal member 27 is for preventing a gap from being generated between the igniter 22 and the holder 25, whereby the space inside the housing is hermetically sealed.

  As shown in FIGS. 7 and 9, a partition member 50 is disposed inside the cylindrical portion 31 of the partition member 30. The partition member 50 is formed by, for example, pressing a plate-shaped member made of metal such as stainless steel, steel, an aluminum alloy, or a stainless alloy, and includes a flat partition portion 51 and an outside of the partition portion 51. And a short cylindrical fixing portion 52 which is erected from the periphery along the axial direction of the housing. The fixed portion 52 is in contact with the inner peripheral surface of the tubular portion 31 of the partition member 30.

  The partition member 50 is configured to be disposed at an intermediate position in the axial direction of the tubular portion 31 of the partition member 30, whereby the space inside the tubular portion 31 of the partition member 30 extends along the axial direction. It is partitioned. The partition member 50 is fixed to the partition member 30 by pressing the fixing portion 52 into the cylindrical portion 31 of the partition member 30. Thereby, the partition member 50 is configured not to move easily with respect to the partition member 30.

  As shown in FIGS. 7 and 9, the space on the other end side of the housing above the partition member 30 (that is, the end side of the housing on which the closing portion 12 is located) relative to the partition member 30 in the space inside the housing. The filter 70B is disposed in the first space S3A and the second space S3B, which is the space inside the partition member 30 and the space on the other end side of the housing above the partition portion 51 of the partition member 50. Has been.

  The filter 70B has a large portion 71 whose outer shape in a cross section perpendicular to the axial direction of the housing is relatively large (that is, has a large diameter) and a small outer shape in a cross section perpendicular to the axial direction of the housing (that is, whose diameter is small). A small cylindrical portion 72 having a substantially cylindrical shape, and an annular stepped portion at the end of the large portion 71 opposite to the side where the small portion 72 is located. 71a is provided. The annular stepped portion 71a is provided to form a gap between the gas outlet 13 provided in the peripheral wall portion 11 of the housing main body 10 and the filter 70B, so that gas stays in the portion. As a result, the utilization efficiency of the filter 70B can be increased.

  Of these, the large portion 71 is located on the other end side of the housing described above, and the small portion 72 is located on the one end portion side of the housing above the large portion 71 (that is, the igniter assembly 20B). Is located on the end side of the housing on which the is located. Note that the distal end surface of the small portion 72 of the filter 70B is in contact with the partition member 50 partition portion 51.

  A seal tape 15 is attached to the main surface of the peripheral wall portion 11 of the housing body 10 located on the filter 70B side so as to close the gas ejection port 13. As the seal tape 15, an aluminum foil or the like having an adhesive member applied on one side is used. Thereby, the airtightness of the space inside the housing is ensured.

  In the cylinder type gas generator 1B according to the present embodiment described above, the space inside the housing is divided into the combustion chamber S1, the gas passage chamber S2, the filter chamber S3 by the partition member 30 and the partition member 50 described above. Thus, the partition member 30 and the partition member 50 function as a pressure partition that separates the partitioned spaces from each other.

  Specifically, as shown in FIGS. 7 to 10, the above-mentioned one end side of the housing relative to the partition member 50 (that is, the end side of the housing on which the igniter assembly 20B is located) is a space. The space including at least a part of the space radially inward of the cylindrical portion 31 of the partition member 30 functions as the combustion chamber S1 in which the gas generating agent 60 is accommodated. More specifically, a space defined by the cylindrical portion 31 and the skirt portion 33 of the partition member 30, the partition portion 51 of the partition member 50, the peripheral wall portion 11 of the housing body 10, and the igniter assembly 20B is as follows. It will function as the combustion chamber S1.

  Further, the above-described space on the one end side of the housing is included in the space on the outer side in the radial direction than the cylindrical portion 31 of the partition member 30 and the axial end portion on the side where the annular portion 32 of the partition member 30 is located. The space functions as a gas passage chamber S2 that connects the combustion chamber S1 and the filter chamber S3. More specifically, a space defined by the cylindrical portion 31, the annular portion 32 and the skirt portion 33 of the partition member 30 and the peripheral wall portion 11 of the housing body 10 functions as the gas passage chamber S2.

  Further, the above-mentioned space that is the above-mentioned other end side of the housing than the axial end portion on the side where the annular portion 32 of the partition member 30 is located (that is, the end portion side of the housing on which the closing portion 12 is located). The first space S <b> 3 </ b> A and the second space S <b> 3 </ b> B which is a space on the other end side of the housing with respect to the partition member 50 and a space radially inward from the cylindrical portion 31 of the partition member 30 are included. The space functions as the filter chamber S3 in which the filter 70B is accommodated. More specifically, the space defined by the cylindrical portion 31 and the annular portion 32 of the partition member 30, the partition portion 51 of the partition member 50, the peripheral wall portion 11 and the closing portion 12 of the housing body 10 is the filter chamber S3. Will function as.

  Here, although the detailed description is omitted, in the cylinder type gas generator 1B in the present embodiment, as in the cylinder type gas generator 1A in the first embodiment described above, the combustion chamber is in operation. The gas generated in S1 flows into the gas passage chamber S2 through the first communication hole 34, and at that time, is blown to the inner peripheral surface of the peripheral wall portion 11 of the housing body 10 along the radial direction of the housing. Thereafter, the gas passage chamber S2 flows along the axial direction of the housing and flows into the filter chamber S3 through the second communication hole 35.

  Also in the cylinder-type gas generator 1B in the present embodiment described above, the interior of the housing is formed by only a total of two parts, the partition member 30 and the partition member 50, as in the case of the first embodiment described above. This space can be divided into a combustion chamber S1, a gas passage chamber S2, and a filter chamber S3. Therefore, it is possible to obtain high cooling efficiency with a very simple configuration, and it is possible to provide a high-performance cylinder type gas generator at low cost. Further, by providing the gas passage chamber S2, the gas generated in the combustion chamber S1 can be introduced more smoothly and efficiently into the filter chamber S3. In this sense as well, a high performance cylinder type gas generator is provided. be able to.

  In particular, there is no gap between the partition member 30 and the partition member 50 and between the partition member 30 and the housing, so that no gas leaks and gas does not leak out. Therefore, the intended operation can be stably realized without complication.

  Here, the reason that the gap does not occur between the partition member 30 and the partition member 50 is that the fixing portion 52 of the partition member 50 is press-fitted and fixed to the tubular portion 31 of the partition member 30, This is also because the partition portion 51 of the partition member 50 is in contact with the small portion 72 of the filter 70B, and thus the movement of the partition member 50 along the axial direction of the housing is prevented.

  On the other hand, the reason why the gap does not occur between the partition member 30 and the housing is that the annular portion 32 and the skirt portion 33 of the partition member 30 are press-fitted and fixed to the housing. This is also because the movement of the partition member 30 along the axial direction of the housing is prevented because 32 is in contact with the large portion 71 of the filter 70B.

  Further, in the cylinder type gas generator 1B in the present embodiment, the annular portion 32 of the partition member 30 is abutted against the large portion 71 of the filter 70B, and the partition portion 51 of the partition member 50 is the filter. Since it is affixed to the small portion 72 of 70B, positioning of these parts can be performed relatively easily during manufacturing, and there is also a merit that the assembling work is also facilitated in this respect. However, these attachments are not necessarily indispensable configurations, and may naturally be configured such that a gap is generated between them.

  In Embodiments 1 and 2 of the present invention described above, the case where both the combustion chamber S1 is configured to include a space located on the igniter assemblies 20A and 20B side with respect to the partition member 30 is illustrated. It is not necessary to configure in this way. That is, the igniter assemblies 20 </ b> A and 20 </ b> B may be fixed in a state of being inserted into the partition member 30, and in this case, the combustion chamber S <b> 1 is closer to the above-described one end side of the housing than the partition member 50 ( That is, it is a space on the end portion side of the housing where the igniter assemblies 20 </ b> A and 20 </ b> B are located) and is configured by a part of the space radially inward from the cylindrical portion 31 of the partition member 30. Become.

  In the first and second embodiments of the present invention described above, the case where only the igniting agent or the igniting agent and the transfer agent is loaded in the ignition unit 22a of the igniter 22 has been described as an example. When the transfer charge is loaded, it is not always necessary to load it in the igniter 22 a of the igniter 22. For example, a cup-shaped member or the like is disposed at a position between the igniter 22 a of the igniter 22 and the gas generating agent 60. This may be loaded using a container or the like.

  In the above-described first and second embodiments of the present invention, the case where the housing body 10 and the igniter assemblies 20A and 20B are connected by caulking and fixing has been described as an example. Of course, it is also possible to use welding or the like to fix the igniter assemblies 20A and 20B.

  In addition, in the first and second embodiments of the present invention described above, the case where the present invention is applied to a cylinder type gas generator incorporated in a side airbag device is described as an example. The target is not limited to this, but is the same as a cylinder type gas generator or a cylinder type gas generator incorporated in a passenger seat airbag device, curtain airbag device, knee airbag device, seat cushion airbag device, etc. The present invention can also be applied to a so-called T-shaped gas generator having a long outer shape.

  Furthermore, the characteristic configurations shown in the first and second embodiments of the present invention described above can naturally be combined with each other within an allowable range in the apparatus configuration.

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

  1A, 1B Cylinder type gas generator, 10 housing body, 11 peripheral wall portion, 12 closed portion, 13 gas outlet, 14 caulking portion, 15 seal tape, 20A, 20B igniter assembly, 21 collar, 21a penetrating portion, 21b Annular groove part, 22 igniter, 22a Ignition part, 22b Terminal pin, 23 Holding part, 23a, 23b Annular groove part, 23c Recessed part, 24 Seal member, 25 Holder, 25a Through part, 25b Caulking part, 25c, 25d Annular groove part, 25e Recess, 26, 27 Seal member, 30 partition member, 31 cylindrical portion, 32 annular portion, 33 skirt portion, 34 first communication hole, 35 second communication hole, 40 cup-shaped member, 41 side wall portion, 41a fixing portion, 42 top wall part (partition part), 50 partition member, 51 partition part, 52 fixing part, 60 gas generating agent, 61 Cushion member, 61a spring part, 61b pressing part, 70A, 70B filter, 71 large part, 71a annular step part, 72 small part, S1 combustion chamber, S2 gas passage chamber, S3 filter chamber, S3A first space, S3B first 2 spaces.

Claims (8)

A combustion chamber containing a gas generating agent, a filter chamber containing a filter through which gas generated in the combustion chamber passes, and a gas passage chamber connecting the combustion chamber and the filter chamber are provided inside the shaft. A long cylindrical housing in which one end and the other end in the direction are closed;
An igniter assembled to the one end of the housing;
A partition member and a partition part, which are located inside the housing and separate the combustion chamber, the filter chamber, and the gas passage chamber from each other;
The partition member is arranged so that an axial direction thereof is substantially parallel to an axial direction of the housing, whereby a cylindrical portion that divides a space inside the housing in a radial direction, and the cylindrical portion The housing is erected radially outward from the axial end located on the other end side of the housing, and its outer peripheral edge abuts on the inner peripheral surface of the housing, so that the space inside the housing is axially And an annular portion partitioned into
The partition portion is disposed inside the tubular portion, thereby partitioning the space inside the tubular portion in the axial direction,
The combustion chamber includes at least a part of a space on the one end side of the housing relative to the partition portion and on the inner side of the cylindrical portion,
The filter chamber includes a first space that is a space closer to the other end of the housing than an axial end on the side where the annular portion of the partition member is located, and the other of the housing than the partition. A second space which is a space on the end side and is a space inside the cylindrical portion,
The gas passage chamber is a space outside the cylindrical portion and includes a space on the one end portion side of the housing from an axial end portion on the side where the annular portion of the partition member is located,
A portion of the cylindrical portion that partitions the combustion chamber and the gas passage chamber is provided with a first communication hole for communicating the combustion chamber and the gas passage chamber.
A portion of the cylindrical portion that partitions the gas passage chamber and the filter chamber is provided with a second communication hole for communicating the gas passage chamber and the filter chamber.
A portion that defines the first space of the housing is provided with a gas outlet for ejecting gas toward the outside of the housing,
The filter includes a large portion having a relatively large outer shape in a cross section orthogonal to the axial direction of the housing, and a small portion having a relatively small outer shape in a cross section orthogonal to the axial direction of the housing,
The gas generator, wherein the filter is disposed in the filter chamber so that the large portion is located in the first space and the small portion reaches the second space. A plurality of the second communication holes are provided in a portion of the cylindrical portion that divides the gas passage chamber and the filter chamber,
2. The gas generator according to claim 1, wherein the small portion is located so as to face all of the plurality of second communication holes.   The gas generator according to claim 1 or 2, wherein a distal end surface of the small portion located on the one end side of the housing is in contact with the partition portion.   4. The device according to claim 1, wherein the small portion is positioned apart from the cylindrical portion such that the peripheral surface of the small portion and the inner peripheral surface of the cylindrical portion are not in contact with each other. A gas generator according to 1.   The gas generator according to any one of claims 1 to 4, wherein the annular portion is in contact with the large portion.   The gas generator according to any one of claims 1 to 5, wherein the partition member is fixed to the housing by press-fitting the annular portion into the housing. The gas generating agent is housed inside, and further includes a cup-shaped member at least part of which is inserted into the cylindrical portion,
The gas generator according to any one of claims 1 to 6, wherein the partition portion is constituted by a top wall portion located on the other end side of the housing of the cup-shaped member.   The gas generator according to any one of claims 1 to 6, wherein the partition part is configured by a part of a partition member fixed to the cylindrical part by being press-fitted into the cylindrical part.

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