JP2020006919A - Gas generator - Google Patents

Abstract

To provide a gas generator that can be reduced in weight without damaging a filter and can be easily manufactured with a simple configuration.SOLUTION: A gas generator 1A includes a partition wall member 44 partitioning a space inside a filter 70 into a first combustion chamber S1 and a second combustion chamber S2, and a cover member 45 assembled to the partition wall member 44. The partition wall member 44 includes a top wall part 44a provided with a first gas passage hole 44a1 and a side wall part 44b, and the cover member 45 includes a first covering part 45a and a second covering part 45b. At the actuation of a second igniter 42, the cover member 45 is moved toward a top plate part 21 side by a pressure rise in the second combustion chamber S2, and the second covering part 45b is deformed to expand. Accordingly, gas generated in the second combustion chamber S2 passes through the first gas passage hole 44a and a gap generated between the partition wall member 44 and the cover member 45, and is introduced into the first combustion chamber S1 by being ejected toward a bottom plate portion 11 side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a gas generator incorporated in an occupant protection device that protects an occupant in the event of a collision of a vehicle or the like, and more particularly, to a gas generator incorporated in an airbag device installed in an automobile or the like.

  2. Description of the Related Art Conventionally, an airbag device, which is an occupant protection device, has been widely used from the viewpoint of protecting occupants of an automobile or the like. The airbag device is provided for the purpose of protecting an occupant from an impact generated at the time of a collision of a vehicle or the like. It is something that catches the body.

  The gas generator is incorporated in this airbag device, ignites the igniter by energization from the control unit at the time of collision of a vehicle, etc., and burns a gas generating agent by the flame generated in the igniter to instantaneously generate a large amount of gas. This is a device for inflating and deploying the airbag.

  There are various types of gas generators, and as a gas generator that is particularly preferably incorporated in a driver-side airbag device, a passenger-side airbag device, or the like, a short roughly circular outer diameter is relatively large. There is a columnar disk-type gas generator. This disk type gas generator also has various structures, one of which is a dual structure disk type gas generator.

  The dual-disc gas generator partitions the combustion chamber formed inside the cylindrical filter installed inside the housing into two chambers, and fills each of the two chambers with a gas generating agent. Two igniters are provided so as to correspond to these two chambers, and one igniter is operated later than the other igniter. This dual-structured disk-type gas generator can maintain the desired gas output for a longer time than a single-structured disk-type gas generator having only a single combustion chamber and a single igniter. Gas output characteristics more suitable for the bag deployment can be obtained.

  In a disk gas generator having a dual structure, a pressure partition is provided inside a housing to partition a combustion chamber into two chambers. In many cases, the pressure bulkhead is generally formed of a cup-shaped member. In this case, the space outside the pressure bulkhead contains the first gas generating agent in which combustion is started first. The space inside the pressure partition is defined as a combustion chamber, and the space inside the pressure partition is defined as a second combustion chamber in which a second gas generating agent whose combustion is started with a delay is stored.

  Here, a gas passage hole for allowing gas generated in the second combustion chamber to be ejected to the outside through the first combustion chamber is provided in the cylindrical side wall of the cup-shaped pressure partition. That is, when the first gas generating agent is burned in the first combustion chamber, the gas passage hole affects the second gas generating agent housed in the second combustion chamber in which combustion has not yet started. It is necessary to be closed by a sealing member so as not to occur.

  Therefore, usually, a sealing member made of a cup-shaped member is provided so as to further cover the cup-shaped pressure partition, and when the first gas generating agent is burned, the gas passage hole is closed by the sealing member. During the combustion of the second gas generating agent, the pressure generated by the burning of the second gas generating agent is locally applied to the sealing member, so that the peripheral wall of the sealing member is opened or cleaved. It is configured to

  A disk gas generator having a dual structure having such a configuration is disclosed in, for example, FIG. 2 of JP-A-2007-131077 (Patent Document 1) and FIG. 5 of JP-A-2010-70073 (Patent Document 2). ing.

JP 2007-131077 A JP 2010-70073 A

  By the way, in the disk-type gas generator having the dual structure, a filter serving as a cooling means for cooling the gas and a removing means for removing the residue (slag) and the like contained in the gas is partitioned by a first partition having a pressure partition. Since it is arranged so as to surround both the combustion chamber and the second combustion chamber, the gas generated in the first combustion chamber by the combustion of the first gas generating agent and the gas generated in the second combustion chamber by the combustion of the second gas generating agent. Then, any gas that is introduced into the first combustion chamber after passing through the above-described gas passage hole is ejected to the outside via the filter.

  At this time, in particular, the gas generated in the second combustion chamber by the combustion of the second gas generating agent and then introduced into the first combustion chamber through the above-described gas passage hole is the gas generated by the combustion of the first gas generating agent. In this case, not only is the disk-type gas generator already heated to a high temperature as a whole, but also because the opening area of the gas passage hole is relatively small, the gas is discharged with a high ejection pressure. It will be ejected from the passage hole. Therefore, if the gas is directly sprayed on the inner peripheral surface of the filter, the filter may be damaged.

  In order to prevent this, it is supposed that the mechanical strength of the filter is increased by increasing the thickness of the filter, but since the filter is a metal member, when viewed as a whole disk-type gas generator This leads to a significant increase in weight, and is not always an effective measure.

  In this regard, in the disk gas generator having the dual structure disclosed in Patent Document 2, attempts have been made to improve this point. That is, in the disk-type gas generator, a weak portion extending in the axial direction is provided at a predetermined position of the peripheral wall of the cup-shaped sealing member, and the weak portion is provided on the peripheral wall of the cup-shaped pressure partition. It is configured not to overlap with the gas passing hole.

  In the case of such a configuration, at the time of combustion of the second gas generating agent, the fragile portion is torn by pressure generated by the burning of the second gas generating agent, and the gas passage hole and the sealing member Since the gas does not overlap with the cleaved portion, the gas is bypassed between the peripheral wall of the pressure partition and the peripheral wall of the sealing member, and the pressure of the gas injected into the first combustion chamber is considerably low. Will be suppressed. Therefore, by adopting the configuration, it is possible to suppress the filter from being damaged without significantly increasing the weight of the disk-type gas generator.

  However, when this configuration is adopted, it is necessary not only to prepare a special shape having a fragile portion as a sealing member, but also to ensure that the fragile portion and the gas passage hole do not overlap. It is necessary to position and mount the sealing member with respect to the pressure bulkhead, which inevitably complicates the assembling work and greatly increases the manufacturing cost.

  Therefore, the present invention has been made to solve the above-described problem, and provides a gas generator that can be reduced in weight without damaging the filter and that can be easily manufactured with a simple configuration. The purpose is to do.

  A gas generator according to the present invention includes a housing, a filter, a partition member, a first igniter, and a second igniter. The housing includes a peripheral wall provided with a gas ejection port, a top plate that closes one axial end of the peripheral wall, and a bottom plate that closes the other axial end of the peripheral wall. In. The filter includes a cylindrical member housed inside the housing such that an outer peripheral surface thereof faces an inner peripheral surface of the peripheral wall portion. The partition member has a cup-like shape including a top wall portion located on the top plate portion side and a side wall portion facing an inner peripheral surface of the filter, and is attached to the bottom plate portion. Accordingly, the space inside the filter is partitioned into a first combustion chamber containing the first gas generating agent and a second combustion chamber containing the second gas generating agent. The first igniter is attached to the bottom plate so as to face the first combustion chamber, which is a space outside the partition member. The second igniter is attached to the bottom plate so as to face the second combustion chamber, which is a space inside the partition member. The top wall is provided with a first gas passage hole for allowing gas generated in the second combustion chamber to pass toward a space outside the partition member. An end of the partition member on the side of the top plate includes a first cover that covers the top wall, and a second cover that covers at least a portion of the side wall closer to the top wall. A cup-shaped cover member is attached. In the gas generator according to the present invention, at the time of operation of the second igniter, the side wall is formed due to a pressure increase in the second combustion chamber caused by combustion of the second gas generating agent. The cover member moves toward the top plate side and the second cover portion expands while at least the state in which the portion near the top wall portion of the portion is surrounded by the second cover portion is maintained. When the cover member is deformed as described above, a first gap is generated between the top wall portion and the first cover portion, and a second gap is generated between the side wall portion and the second cover portion. Accordingly, the gas generated in the second combustion chamber passes through the first gas passage hole, the first gap, and the first communication path defined by the second gap, thereby causing the gas to flow toward the bottom plate portion. And is introduced into the first combustion chamber.

  In the gas generator according to the present invention, it is preferable that the movement of the cover member during the operation of the second igniter is limited by the top plate.

  In the gas generator according to the present invention, in the operation of the first igniter prior to the operation of the second igniter, the first gas generating agent is burned by the first gas generating agent. The distance between the top plate portion and the first cover portion may be increased by deforming the top plate portion so as to expand outward due to a pressure increase. . In this case, it is preferable that the increase in the distance be included in the movement of the cover member when the second igniter is operated.

  In the gas generator according to the present invention, during the operation of the second igniter, the pressure rise or the temperature rise of the second combustion chamber caused by the combustion of the second gas generating agent. The first cover may be configured such that an opening is formed in the first cover by breaking or melting. In this case, in addition to the above, the gas generated in the second combustion chamber is introduced into the first combustion chamber by passing through the first communication passage, and in addition, the first gas passage is performed. By passing through the second communication passage defined by the hole, the first gap, and the opening, the gas is ejected toward the top plate and introduced into the first combustion chamber. Is also good.

  In the gas generator according to the present invention, the gas that has passed through the first gas passage hole is supplied to the first cover portion at a position that does not overlap the first gas passage hole. A second gas passage hole for passing the gas toward the space may be provided. In that case, during the operation of the first igniter prior to the operation of the second igniter, the pressure of the first combustion chamber is increased due to the combustion of the first gas generating agent. The second gas passage hole may be closed by the top wall when the first cover is pressed toward the top wall. Further, in this case, when the second igniter is operated, the cover member is moved by the top plate portion due to a pressure increase in the second combustion chamber caused by combustion of the second gas generating agent. By moving toward the side, the blockage of the second gas passage hole by the top wall may be released. In this case, in addition to the above, the gas generated in the second combustion chamber is introduced into the first combustion chamber by passing through the first communication passage, and in addition, the first gas passage is performed. Through the third communication passage defined by the hole, the first gap, and the second gas passage hole, the gas is ejected toward the top plate side to be introduced into the first combustion chamber. It may be.

  In the gas generator according to the present invention, in a state after the movement and deformation of the cover member during the operation of the second igniter are completed, the gas generator is formed between the cover member and the partition member. It is preferable that a total opening area of a portion connecting the space formed and the first combustion chamber is larger than a total opening area of the first gas passage hole.

  In the gas generator according to the present invention, it is preferable that the cover member is press-fitted into the partition member so that the second cover portion comes into pressure contact with the side wall portion.

  In the gas generator according to the present invention, the filter may be arranged coaxially with the housing so that the center axis of the filter overlaps with the center axis of the peripheral wall portion. The partition wall member may be eccentrically arranged with respect to the housing such that the central axis of the side wall portion does not overlap with the central axis of the peripheral wall portion.

  According to the present invention, it is possible to provide a gas generator that can be reduced in weight without damaging the filter and that can be easily manufactured with a simple configuration.

FIG. 1 is a schematic diagram of a disk-type gas generator according to Embodiment 1. FIG. 2 is a schematic sectional view taken along line II-II shown in FIG. 1. FIG. 2 is an exploded view showing an assembling structure of a cover member shown in FIG. 1 to a partition member. FIG. 2 is a schematic diagram showing a first stage during operation of the disk-type gas generator shown in FIG. 1. FIG. 2 is a schematic diagram showing a second stage during operation of the disk-type gas generator shown in FIG. 1. FIG. 3 is a schematic diagram showing a third stage during operation of the disk-type gas generator shown in FIG. 1. It is a mimetic diagram showing the 2nd stage at the time of operation of the disk type gas generator concerning a modification. FIG. 5 is a schematic diagram of a disk-type gas generator according to a second embodiment. FIG. 9 is an exploded view showing an assembly structure of the cover member shown in FIG. 8 to the partition member. FIG. 10 is a schematic diagram showing a first stage during operation of the disk-type gas generator shown in FIG. 9. FIG. 10 is a schematic diagram showing a second stage of the operation of the disk-type gas generator shown in FIG. 9. FIG. 10 is a schematic diagram showing a third stage during operation of the disk-type gas generator shown in FIG. 9.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments described below, the present invention is applied to a disk gas generator having a dual structure suitably incorporated in an airbag device mounted on a steering wheel or the like of an automobile. In the embodiments described below, the same or common portions are denoted by the same reference characters in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic diagram of a disk-type gas generator according to Embodiment 1 of the present invention, and FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. FIG. 3 is an exploded view showing an assembly structure of the cover member shown in FIG. 1 to the partition member. First, the configuration of the disk-type gas generator 1A according to the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the disk-type gas generator 1A has a short, substantially cylindrical housing whose one end and the other end in the axial direction are closed, and a housing provided inside the housing. In the space, a first igniter assembly 30, a second igniter assembly 40, a first gas generating agent 51, a second gas generating agent 52, a lower support member 61, an upper support member 62, and a filter as internal components. 70 etc. are accommodated.

  As shown in FIG. 1, the housing includes a lower shell 10 and an upper shell 20. Each of the lower shell 10 and the upper shell 20 is formed of a press-formed product formed by pressing a rolled metal plate-shaped member, for example. As the metal plate-like member constituting the lower shell 10 and the upper shell 20, for example, a metal plate made of stainless steel, steel, an aluminum alloy, a stainless alloy, or the like is used, and preferably 440 [MPa] or more and 780 or more. A so-called high-strength steel sheet which does not cause breakage such as breakage even when a tensile stress of [MPa] or less is applied is used.

  The lower shell 10 and the upper shell 20 are each formed in a substantially cylindrical shape with a bottom, and are combined and joined so that their opening surfaces face each other to form a housing. The lower shell 10 has a bottom plate part 11 and a peripheral wall part 12, and the upper shell 20 has a top plate part 21, a peripheral wall part 22, and a flange part 23.

  The upper end of the peripheral wall 12 of the lower shell 10 is press-fitted by being inserted into the lower end of the peripheral wall 22 of the upper shell 20. Furthermore, the lower shell 10 and the upper shell 20 are fixed by joining the peripheral wall portion 12 of the lower shell 10 and the peripheral wall portion 22 of the upper shell 20 at or near their contact portions. ing. Here, electron beam welding, laser welding, friction welding, and the like can be suitably used for joining the lower shell 10 and the upper shell 20.

  Thereby, the portion of the peripheral wall of the housing near the bottom plate 11 is constituted by the peripheral wall 12 of the lower shell 10, and the portion of the peripheral wall of the housing near the top plate 21 is located on the upper side. It is constituted by the peripheral wall portion 22 of the shell 20. One end and the other end of the housing in the axial direction are closed by a bottom plate 11 of the lower shell 10 and a top plate 21 of the upper shell 20, respectively.

  The flange portion 23 provided on the upper shell 20 is a portion for fixing the disk-type gas generator 1A to an external member (for example, a retainer provided in an airbag device). At a predetermined position of the flange portion 23, a through hole (the through hole is not shown in the drawing) is provided so as to penetrate along the direction parallel to the axial direction of the peripheral wall portion 22. A fastening member such as a bolt is inserted into the through hole, whereby the disk-type gas generator 1A is fixed to an external member.

  At a predetermined position of the bottom plate portion 11 of the lower shell 10, a first opening 11a and a second opening 11b are provided. The first opening 11a is a portion for exposing a first female connector portion, which will be described later, provided at the lower end of the first igniter assembly 30 to the outside, and the second opening 11b is a second opening. This is a portion for exposing a second female connector portion provided at the lower end of the igniter assembly 40 to be described later to the outside.

  The first igniter assembly 30 mainly includes a first holder 31, a first igniter 32, a first seal member 33, a cup body 34, and a transfer charge 36. The first holder 31 constitutes the base of the first igniter assembly 30. The first igniter 32, the cup body 34, and the like are attached to the first holder 31, so that the first igniter 31 is provided. The assembly 30 is configured as an integral part.

  The first holder 31 is made of a member having a substantially cylindrical outer shape, and is made of, for example, a metal member such as stainless steel, steel, an aluminum alloy, and a stainless alloy. An upper concave portion 31a is provided on an upper surface of the first holder 31 located on the top plate portion 21 side, and a lower concave portion 31b is provided on a lower surface of the first holder 31 located on the bottom plate portion 11 side. I have. In addition, the first holder 31, which is the bottom part of the upper concave part 31a and the bottom part of the lower concave part 31b, is provided with a through hole 31c so as to reach the upper concave part 31a and the lower concave part 31b.

  In addition, caulking portions 31d and 31e are provided on the upper surface of the first holder 31 so as to surround the upper concave portion 31a. The caulking portion 31d arranged inside is a portion for caulking and fixing the first igniter 32 to the first holder 31, and the caulking portion 31e arranged outside is used to fix the cup body 34. This is a portion for caulking and fixing to the first holder 31.

  The first igniter 32 is for generating a flame, and has a base 32a, an igniter 32b, and a pair of terminal pins 32c. The base 32a is a part that holds the ignition part 32b and the pair of terminal pins 32c, and is also a part that is fixed to the first holder 31. The igniter 32b includes therein an igniting charge that ignites and burns during operation to generate a flame, and a resistor (bridge wire) for igniting the igniting charge. The pair of terminal pins 32c are connected to the ignition section 32b to ignite the ignition charge.

  More specifically, the igniter 32b includes a squib cup formed in a cup shape, and an obturator for closing the open end of the squib cup and for inserting and holding a pair of terminal pins 32c, The above-described resistor is attached so as to connect the tips of the pair of terminal pins 32c inserted into the squib cup, and the igniting charge is placed in the squib cup so as to surround the resistor or approach the resistor. It has a loaded configuration.

  Here, 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 igniter. The squib cup and the embolus described above are generally made of metal or plastic.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 32c. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition charge starts burning. The hot flame generated by the combustion causes the squib cup containing the igniter to burst. The time from the current flowing through the resistor to the activation of the first igniter 32 is generally 2 [ms] or less when a nichrome wire is used for the resistor.

  The first igniter 32 is described above in a state where a pair of terminal pins 32c are inserted into the through holes 31c of the first holder 31 from above and the base 32a is accommodated and fastened in the upper recess 31a of the first holder 31. The swaged portion 31d is fixed to the first holder 31 by being bent.

  Here, a first seal member 33 made of an O-ring or the like is interposed between the first holder 31 and the first igniter 32, whereby the first holder 31 and the first igniter 32 are connected to each other. By closing the gap between them, airtightness in the portion is ensured. In addition, the fixing method of the first igniter 32 is not limited to the fixing method using the caulking portion 31d described above, and another fixing method may be used.

  The cup body 34 has a substantially cylindrical shape with a bottom and an open end at the bottom plate 11 side, and includes a transfer chamber 35 in which a transfer agent 36 is accommodated. The cup body 34 has a top wall portion 34a and a side wall portion 34b that define the transfer chamber 35, and a flange portion 34c extending radially outward from a portion on the opening end side of the side wall portion 34b. I have.

  The cup body 34 is assembled to the first holder 31 such that the transfer chamber 35 formed therein faces the ignition part 32b of the first igniter 32. More specifically, the flange part 34c is The caulking portion 31e is fixed to the first holder 31 by being bent in a state where the caulking portion 31e is fixed to the upper surface of the first holder 31.

  The cup body 34 does not have an opening in any of the top wall portion 34a and the side wall portion 34b, and surrounds the transfer chamber 35 provided therein. The cup body 34 ruptures or melts due to an increase in pressure in the transfer chamber 35 or conduction of generated heat when the transfer charge 36 is ignited by the operation of the first igniter 32. Its mechanical strength is relatively low.

  Therefore, the cup body 34 is made of a metal member such as aluminum or an aluminum alloy, a thermosetting resin represented by an epoxy resin, a polybutylene terephthalate resin, a polyethylene terephthalate resin, or a polyamide resin (for example, nylon 6 or nylon 66). Etc.) and those made of a resin member such as a thermoplastic resin represented by a polypropylene sulfide resin, a polypropylene oxide resin and the like are preferably used.

  The cup body 34 is made of a metal member having high mechanical strength, such as iron or copper, and has an opening in the side wall portion 34b. It is also possible to use a tape to which a sealing tape is stuck so as to close it. Further, the method of fixing the cup body 34 is not limited to the fixing method using the caulking portion 31e described above, and another fixing method may be used.

The transfer charge 36 filled in the transfer chamber 35 is ignited by a flame generated by the operation of the first igniter 32, and burns to generate thermal particles. The transfer agent 36 must be capable of reliably starting the combustion of the first gas generating agent 51, and is generally B / KNO ₃ , B / NaNO ₃ , or Sr (NO ₃ ). _A composition composed of a metal powder / oxidizing agent represented by ₂ or the like, a composition composed of titanium hydride / potassium perchlorate, a composition composed of B / 5-aminotetrazole / potassium nitrate / molybdenum trioxide, and the like are used. .

  As the transfer agent 36, a powdery material, a material formed into a predetermined shape by a binder, or the like is used. Examples of the shape of the transfer agent 36 formed by the binder include various shapes such as a granular shape, a cylindrical shape, a sheet shape, a spherical shape, a single-hole cylindrical shape, a multi-hole cylindrical shape, and a tablet shape.

  The lower end of the first holder 31 is inserted from above into a first opening 11 a provided in the bottom plate 11 of the lower shell 10, and is fixed by joining its outer peripheral edge to the bottom plate 11. ing. Thereby, the first igniter assembly 30 integrated by previously attaching the first igniter 32 and the cup body 34 to the first holder 31 is fixed to the lower shell 10 and In particular, the transfer chamber 35 provided inside the first igniter assembly 30 is arranged so as to protrude toward the space inside the housing. Here, electron beam welding, laser welding, friction welding, or the like can be suitably used for joining the bottom plate 11 and the first holder 31.

  A pair of terminal pins 32c of the first igniter 32 are exposed and positioned in the lower recess 31b of the first holder 31. As a result, the first female connector portion described above is configured by the lower recess 31b and the pair of terminal pins 32c.

  The first female connector portion is a portion for receiving a male connector (not shown) of a harness for connecting the first igniter 32 to a control unit (not shown). The first female connector portion is exposed to the outside, and when the above-described male connector is inserted into the first female connector portion, electrical continuity between the core wire of the harness and the terminal pin 32c is established. Will be realized.

  The second igniter assembly 40 includes a second holder 41, a second igniter 42, a second seal member 43, a partition member 44 as a pressure partition, a cover member 45 as a sealing member, It mainly contains the gas generating agent 52 and the cushion material 46. The second holder 41 constitutes the base of the second igniter assembly 40, and the second igniter 42 and the partition member 44 are assembled to the second holder 41, so that the second igniter The assembly 40 is configured as an integral part.

  The second holder 41 is formed of a member having a substantially cylindrical outer shape, and is formed of a metal member such as stainless steel, iron and steel, an aluminum alloy, and a stainless alloy. An upper concave portion 41a is provided on the upper surface of the second holder 41 located on the top plate portion 21 side, and a lower concave portion 41b is provided on the lower surface of the second holder 41 located on the bottom plate portion 11 side. I have. In addition, the second holder 41, which is the bottom part of the upper concave part 41a and the bottom part of the lower concave part 41b, is provided with a through hole 41c so as to reach the upper concave part 41a and the lower concave part 41b.

  A caulking portion 41d is provided on the upper surface of the second holder 41 so as to surround the upper concave portion 41a. The caulking portion 41d is a portion for caulking and fixing the second igniter 42 to the second holder 41.

  The second igniter 42 is for generating a flame, and has a base 42a, an igniter 42b, and a pair of terminal pins 42c. The base 42a is a part that holds the ignition part 42b and the pair of terminal pins 42c, and is also a part that is fixed to the second holder 41. Note that the second igniter 42 has basically the same configuration as the first igniter 32 described above, and a detailed description thereof will be omitted here.

  The second igniter 42 is described above in a state where a pair of terminal pins 42c is inserted into the through hole 41c of the second holder 41 from above, and the base 42a is accommodated and fastened in the upper recess 41a of the second holder 41. The swaged portion 41d is fixed to the second holder 41 by being bent.

  Here, a second seal member 43 made of an O-ring or the like is interposed between the second holder 41 and the second igniter 42, whereby the second holder 41 and the second igniter 42 By closing the gap between them, airtightness in the portion is ensured. The method of fixing the second igniter 42 is not limited to the fixing method using the caulking portion 41d described above, and another fixing method may be used.

  As shown in FIGS. 1 and 3, the partition member 44 has a substantially cylindrical shape with a bottom and an open end on the bottom plate 11 side, and is a space inside the housing and the filter 70. It functions as a pressure partition that partitions the inner space into two chambers. The partition member 44 has a substantially disk-shaped top wall portion 44a located on the top plate 21 side and a substantially cylindrical side wall portion 44b facing the inner peripheral surface of the filter 70. It is composed of metal members such as steel, aluminum alloy, and stainless alloy.

  The space inside the housing and inside the filter 70 is partitioned by the partition member 44 into a space outside the partition member 44 and a space inside the partition member 44. The former space is defined as the first combustion chamber S1, and the latter space is defined as the second combustion chamber S2.

  The partition member 44 is attached to the second holder 41 such that the second combustion chamber S2 formed therein faces the ignition portion 42b of the second igniter 42. More specifically, the lower end of the side wall portion 44b of the partition member 44 functions as a fixing portion 44c fixed to the second holder 41. More specifically, the fixing portion 44c is press-fitted into the second holder 41. As a result, the partition member 44 is fixed to the second holder 41.

  A plurality of first gas passage holes 44a1 are provided in the top wall portion 44a of the partition member 44. The plurality of first gas passage holes 44a1 are for allowing gas generated in the second combustion chamber S2 to pass toward a space outside the partition member 44, and along the thickness direction of the top wall portion 44a. It is provided so as to penetrate the top wall portion 44a.

  As shown in FIG. 1, a second gas generating agent 52 is contained in the second combustion chamber S2. The second gas generating agent 52 is a chemical that is ignited by the heat particles generated by the operation of the second igniter 42 and generates gas by burning. The details of the second gas generating agent 52 will be described later.

  A disk-shaped cushion material is provided at an end of the second combustion chamber S2 on the side of the top wall 44a of the partition member 44 so as to contact the second gas generating agent 52 housed in the second combustion chamber S2. 46 are arranged. As a result, the cushion member 46 is located between the top wall portion 44a and the second gas generating agent 52 at the portion on the side of the top wall portion 44a of the second combustion chamber S2. It is pressed toward the second holder 41 and the second igniter 42.

  The cushion material 46 is provided for the purpose of preventing the second gas generating agent 52 made of a molded body from being pulverized by vibration or the like, and is preferably a ceramic fiber molded body, rock wool, foamed resin ( For example, foamed silicone, foamed polypropylene, foamed polyethylene, etc.), chloroprene, and a member made of rubber typified by EPDM. The cushion material 46 is burned off by the combustion of the second gas generating agent 52.

  As shown in FIGS. 1 and 3, the cover member 45 has a substantially cylindrical shape with a bottom and an open end on the bottom plate 11 side, and the end of the partition member 44 on the top plate 21 side. Is covered. The cover member 45 is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy, for example, similarly to the partition member 44, but has a thickness sufficiently smaller than that of the partition member 44. Is done.

  The cover member 45 includes a disk-shaped first cover portion 45a that covers the top wall portion 44a of the partition member 44, and a cylindrical second cover that covers a portion of the side wall portion 44b of the partition member 44 near the top wall portion 44a. Part 45b. The plurality of first gas passage holes 44a1 provided in the top wall portion 44a of the partition member 44 are covered by the first cover portion 45a of the cover member 45.

  The cover member 45 is attached to the partition member 44 by being externally inserted into the above-described end of the partition member 44, and is preferably fixed to the partition member 44 by press-fitting. Here, by making the inside diameter of the second covering portion 45b of the cover member 45 substantially the same as the outside diameter of the side wall portion 44b of the partition member 44, the second covering portion 45b comes into pressure contact with and close contact with the side wall portion 44b. Therefore, it is possible to prevent the state where the first combustion chamber S1 and the second combustion chamber S2 communicate with each other.

  As shown in FIG. 1, the lower end of the second holder 41 is inserted from above into a second opening 11 b provided in the bottom plate 11 of the lower shell 10, and the outer peripheral edge of the second holder 41 is opposed to the bottom plate 11. It is fixed by being joined. Thereby, the second igniter assembly 40 integrated by previously attaching the second igniter 42 and the partition member 44 to the second holder 41 is fixed to the lower shell 10 and In particular, the second combustion chamber S2 provided inside the second igniter assembly 40 is arranged so as to protrude toward the space inside the housing. Here, electron beam welding, laser welding, friction welding, or the like can be suitably used for joining the bottom plate 11 and the second holder 41.

  A pair of terminal pins 42c of the second igniter 42 are exposed and positioned in the lower recess 41b of the second holder 41. As a result, the above-described second female connector portion is configured by the lower concave portion 41b and the pair of terminal pins 42c.

  The second female connector is a portion for receiving a male connector (not shown) of a harness for connecting the second igniter 42 to a control unit (not shown). The second female connector portion is exposed to the outside, and when the above-described male connector is inserted into the second female connector portion, electrical continuity between the core wire of the harness and the terminal pin 42c is established. Will be realized.

  As shown in FIGS. 1 and 2, a filter 70 is housed in the space inside the housing in addition to the first igniter assembly 30 and the second igniter assembly 40 described above. The filter 70 has a cylindrical shape, and is arranged coaxially with the housing such that the central axis thereof coincides with the central axis of the peripheral wall of the housing. Thereby, the outer peripheral surface of the filter 70 faces the inner peripheral surface of the peripheral wall of the housing.

  The filter 70 surrounds the first igniter assembly 30 and the second igniter assembly 40 such that the first igniter assembly 30 and the second igniter assembly 40 are disposed in a space inside the filter 70. Are located in Thus, the first combustion chamber S1 in which the first gas generating agent 51 is stored is formed in the space inside the filter 70 and outside the partition member 44. The filter 70 is arranged at a predetermined distance from the peripheral wall of the housing, whereby a gas discharge chamber S3 is formed between the filter 70 and the peripheral wall of the housing.

  As the filter 70, for example, a filter obtained by winding and sintering a metal wire such as stainless steel or steel, or a filter obtained by pressing a net obtained by braiding a metal wire and pressing the same can be used. As the mesh material, specifically, a knitted wire mesh, a plain-woven wire mesh, an aggregate of a crimp-woven metal wire, or the like can be used.

  Alternatively, a filter formed by winding a perforated metal plate or the like can be used as the filter 70. In this case, as the perforated metal plate, for example, an expanded metal formed by forming a staggered cut in the metal plate and expanding it to form a hole to form a mesh, or forming a hole in the metal plate, A hook metal or the like is used which flattens the burrs formed on the periphery of the hole by crushing the burrs. In this case, the size and shape of the hole to be formed can be appropriately changed as needed, and holes having different sizes and shapes on the same metal plate may be included. As the metal plate, for example, a steel plate (mild steel) or a stainless steel plate can be suitably used, and a non-ferrous metal plate such as aluminum, copper, titanium, nickel or an alloy thereof can also be used.

  When the gas generated in the first combustion chamber S1 and the second combustion chamber S2 passes through the filter 70, the filter 70 functions as a cooling unit that cools the gas by removing high-temperature heat of the gas. At the same time, it functions as a removing means for removing residues (slag) and the like contained in the gas. Therefore, in order to sufficiently cool the gas and prevent the residue from being released to the outside, the configuration is such that the gas generated in the first combustion chamber S1 and the second combustion chamber S2 surely passes through the filter 70. Need to be done.

  Here, the first igniter assembly 30 is eccentrically arranged so that its central axis does not overlap with the central axis of the peripheral wall of the housing. The eccentric arrangement is made so as not to overlap with the center axis of the portion (that is, so that the center axis of the side wall portion 44b of the partition member 44 does not overlap with the center axis of the peripheral wall portion of the housing). With this configuration, it is possible to prevent a dead space from being generated inside the housing, and it is possible to configure the disk-type gas generator 1A as a whole to be small.

  The first gas generating agent 51 is accommodated in the first combustion chamber S1. More specifically, the first gas generating agent 51 is a space inside the filter 70 and adjacent to the top wall portion 34a and the side wall portion 34b of the cup body 34 of the first igniter assembly 30, and , Adjacent to the side wall portion 44b of the partition member 44 of the second igniter assembly 40 (more precisely, the second cover portion 45b of the cover member 45 that covers the side wall portion 44b). It is arranged in a space that fits. The first gas generating agent 51 is an agent that is ignited by the heat particles generated by the operation of the first igniter 32 and generates gas by burning.

  As the first gas generating agent 51 and the second gas generating agent 52 described above, it is preferable to use a non-azide-based gas generating agent. Generally, these first gas generating agents are used as a molded article containing a fuel, an oxidizing agent and an additive. 51 and a second gas generating agent 52 are formed.

  As the fuel, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative or the like or a combination thereof is used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are suitably used.

  Examples of the oxidizing agent include basic nitrates such as basic copper nitrate and the like, perchlorates such as ammonium perchlorate and potassium perchlorate, cations selected from alkali metals, alkaline earth metals, transition metals and ammonia. Nitrate containing is used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are suitably used.

  Examples of the additive include a binder, a slag forming agent, a combustion regulator and the like. As the binder, for example, organic binders such as polyvinyl alcohol, metal salts of carboxymethylcellulose, and stearate, and inorganic binders such as synthetic hydrotalcite and acid clay can be suitably used. In addition, as the binder, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guar gum, polyvinylpyrrolidone, polyacrylamide, polysaccharide derivatives such as starch Also, inorganic binders such as molybdenum disulfide, talc, bentonite, diatomaceous earth, kaolin, and alumina can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay and the like can be suitably used. As the combustion regulator, metal oxide, ferrosilicon, activated carbon, graphite and the like can be suitably used.

  Examples of the shape of the molded article of the gas generating agent include various shapes such as a granular shape such as a granular shape, a pellet shape, and a cylindrical shape, and a disk shape. In the case of a cylindrical shape, a perforated (for example, a single-hole cylindrical shape, a perforated cylindrical shape, or the like) molded body 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 device in which the disc-type gas generator 1A is incorporated. For example, a shape in which the gas generation rate changes with time when the gas generating agent is burned is used. It is preferable to select an optimal shape according to the specifications, such as selection. In addition, it is preferable to appropriately select the size and the filling amount of the molded body in consideration of the linear burning speed, the pressure index, and the like of the gas generating agent in addition to the shape of the gas generating agent.

  Here, the first gas generating agent 51 and the second gas generating agent 52 may have the same composition or may have different compositions. Further, the first gas generating agent 51 and the second gas generating agent 52 may have the same shape or the same size, or may have different shapes and sizes.

  A plurality of gas outlets 24 are provided in the peripheral wall portion 22 of the upper shell 20 facing the filter 70. The plurality of gas outlets 24 are for guiding the gas that has passed through the filter 70 to the outside of the housing.

  A metal sealing tape 25 as a sealing member is attached to the inner peripheral surface of the peripheral wall portion 22 of the upper shell 20 so as to close the plurality of gas outlets 24. As the seal tape 25, an aluminum foil or the like having an adhesive member applied to one surface can be suitably used, and the seal tape 25 ensures airtightness of the space inside the housing.

  As shown in FIG. 1, a lower support member 61 is disposed at an end of the first combustion chamber S <b> 1 located on the bottom plate 11 side. The lower support member 61 has an annular shape, and is disposed so as to cover the boundary between the filter 70 and the bottom plate 11 so as to cover the filter 70 and the bottom plate 11. Thus, the lower support member 61 is located between the bottom plate 11 and the first gas generating agent 51 in the vicinity of the end of the first combustion chamber S1.

  The lower support member 61 is a member for fixing the filter 70 to the housing, and allows the gas generated in the first combustion chamber S1 and the second combustion chamber S2 to pass through the inside of the filter 70 during operation. It also functions as an outflow prevention means for preventing outflow from a gap between the lower end of the filter 70 and the bottom plate portion 11. The lower support member 61 is formed by, for example, pressing a metal plate member, and is preferably formed of a steel plate (eg, a cold-rolled steel plate or a stainless steel plate) of ordinary steel or special steel. It is comprised by the member which becomes.

  An upper support member 62 is arranged at an end of the first combustion chamber S1 located on the top plate 21 side. The upper support member 62 has a substantially disk shape, and is disposed to be addressed to the filter 70 and the top plate 21 so as to cover a boundary between the filter 70 and the top plate 21. I have. Thus, the upper support member 62 is located between the top plate 21 and the first gas generating agent 51 near the end of the first combustion chamber S1.

  The upper support member 62 is a member for fixing the filter 70 to the housing. In operation, the gas generated in the first combustion chamber S1 and the second combustion chamber S2 does not pass through the inside of the filter 70. It also functions as outflow prevention means for preventing outflow from the gap between the upper end of the filter 70 and the top plate 21. The upper support member 62 is formed by, for example, pressing a metal plate-shaped member, similarly to the lower support member 61 described above, and is preferably made of a steel plate such as ordinary steel or special steel (for example, Cold-rolled steel sheet, stainless steel sheet, etc.).

  Inside the upper support member 62, a cushion material 63 having a substantially C-shape in plan view is arranged so as to contact the first gas generating agent 51 housed in the first combustion chamber S1. As a result, the cushion member 63 is located between the top plate 21 and the first gas generating agent 51 at the portion of the first combustion chamber S1 on the top plate 21 side, and the first gas generating agent 51 is It is pressed toward the bottom plate 11 side.

  The cushion material 63 is provided for the purpose of preventing the first gas generating agent 51 formed of a molded body from being crushed by vibration or the like, and is preferably a molded body of ceramic fiber, rock wool, or foamed resin ( For example, foamed silicone, foamed polypropylene, foamed polyethylene, etc.), chloroprene, and a member made of rubber typified by EPDM. The cushion material 63 is burned off by the combustion of the first gas generating agent 51.

  FIGS. 4 to 6 are schematic diagrams showing first to third stages during operation of the disk-type gas generator according to the present embodiment. Next, the operation of the disk-type gas generator 1A according to the present embodiment will be described with reference to FIGS.

  When a vehicle equipped with the disk-type gas generator 1A collides, the collision is detected by collision detection means separately provided on the vehicle, and based on the collision, power is supplied from a control unit separately provided on the vehicle. First, the first igniter 32 operates.

  As shown in FIG. 4, in the first stage in which the first igniter 32 operates, the igniter charged in the igniting portion 32b of the first igniter 32 is ignited by being heated by the resistor, and The burning of the explosive causes the ignition portion 32b to burst. Thus, the transfer charge 36 accommodated in the cup body 34 is ignited and burns.

  The combustion of the transfer charge 36 generates a large amount of heat particles inside the transfer chamber 35, and the temperature and pressure of the transfer chamber 35 increase, so that the cup body 34 made of a fragile member bursts or melts. . When the cup body 34 ruptures or melts, a large amount of the heat particles described above flow into the first combustion chamber S1.

  When a large amount of heat particles flow into the first combustion chamber S1, the first gas generating agents 51 accommodated in the first combustion chamber S1 are sequentially ignited and burned, and thereby a large amount of gas is generated in the first combustion chamber S1. Occurs. The gas generated in the first combustion chamber S1 passes through the inside of the filter 70, and at that time, the heat is taken away by the filter 70 and cooled, and the slag contained in the gas is removed by the filter 70 to remove the gas. It flows into the discharge chamber S3.

  At this time, the seal tape 25 that has closed the plurality of gas outlets 24 is torn due to a pressure increase inside the housing caused by the burning of the first gas generating agent 51. Thus, the gas generated in the first combustion chamber S1 is started to be jetted toward the outside of the housing through the plurality of gas jets 24 (see arrow AR11).

  At this time, the bottom plate portion 11 of the lower shell 10 and the top plate portion 21 of the upper shell 20 move outward due to a pressure increase inside the housing caused by the combustion of the first gas generating agent 51. Deforms to bulge toward. As a result, the distance between the first covering portion 45a of the cover member 45 attached to the end on the top wall portion 44a side of the partition member 44 and the top plate portion 21 of the upper shell 20 increases. Become.

  On the other hand, in the first stage, the cover member 45 is pressed against the partition member 44 due to a pressure increase in the first combustion chamber S1 caused by the combustion of the first gas generating agent 51. . Therefore, the top wall portion 44a and the side wall portion 44b of the partition member 44 are covered by the first cover portion 45a and the second cover portion 45b of the cover member 45, respectively, and are in close contact with the first cover portion 45a and the second cover portion 45b. State.

  As a result, the state in which the first gas passage hole 44a1 provided in the top wall portion 44a of the partition member 44 is closed by the cover member 45 is maintained. For this reason, in the first stage, the first combustion chamber S1 and the second combustion chamber S2 do not become in a state of communication with each other, and the first gas generating agent 51 is added to the second gas generating agent 52 whose combustion has not yet started. The effect of the combustion of the gas is not affected.

  Next, at a timing delayed by a predetermined time from the operation of the above-described first igniter 32, the second igniter 42 is operated by receiving power from the above-described control unit.

  As shown in FIG. 5, in the second stage in which the second igniter 42 is activated, the igniter charged in the ignition portion 42b of the second igniter 42 is ignited by being heated by the resistor, and The burning of the explosive causes the ignition part 42b to burst. As a result, the second gas generating agents 52 contained in the second combustion chamber S2 are sequentially ignited and start burning. In addition, the cushion material 46 accommodated in the second combustion chamber S2 is burned off with the combustion of the second gas generating agent 52.

  Here, prior to the start of combustion of the second gas generating agent 52, the first gas generating agent 51 was previously ignited and burned, so that the disk-type gas generator 1A was already heated to a high temperature as a whole. In this state, the combustion of the second gas generating agent 52 is started smoothly without providing a transfer charge between the ignition portion 42b and the second gas generating agent 52, and the second gas generating agent The burning of the agent 52 can be continued without interruption.

  At this time, the cover member 45 moves toward the top plate 21 of the upper shell 20 as a whole due to a pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52. More specifically, the gas generated in the second combustion chamber S2 passes through a plurality of first gas passage holes 44a1 provided in the top wall portion 44a of the partition member 44 as the pressure in the second combustion chamber S2 increases. As a result, the first covering portion 45a of the cover member 45 is pushed up by receiving the force by the gas, and moves toward the outside of the partition member 44 (see the arrow AR12). Moves toward the top board 21 side.

  As a result, a first gap G1 is generated between the top wall portion 44a of the partition member 44 and the first cover portion 45a of the cover member 45. The first gap G1 extends along a direction intersecting the central axis of the second igniter assembly 40. At this time, the side wall portion 44b of the partition member 44 and the second cover portion 45b of the cover member 45 are still in close contact with each other, and the first combustion chamber S1 and the second combustion chamber S2 are not in communication. Is maintained.

  Here, the movement of the cover member 45 during the operation of the second igniter 42 depends on the top plate 21 of the upper shell 20 (more precisely, the upper support 21 addressed to the top plate 21 of the upper shell 20). This is realized by the presence of a space (that is, a movement margin) between the member 62) and the first covering portion 45a of the cover member 45. The amount of increase in the distance between the top plate portion 21 and the first cover portion 45a due to the deformation of the bottom plate portion 11 of the lower shell 10 and the top plate portion 21 of the upper shell 20 described above is included in this margin. Will be included.

  Next, as shown in FIG. 6, a part of the first cover portion 45 a of the cover member 45 abuts on the upper support member 62 addressed to the top plate 21 of the upper shell 20, so that the cover member 45 is formed. Is restricted by the top plate 21, whereby the cover member 45 stops. However, in the second combustion chamber S2, since the gas is continuously generated by the successive burning of the second gas generating agent 52, a large force is continuously applied to the cover member 45.

  As a result, the cover member 45 is deformed such that the second cover 45b of the cover member 45 expands. More specifically, the second cover portion 45b of the cover member 45 is provided with a plurality of first gas passage holes 44a1 provided in the top wall portion 44a of the partition member 44 by the gas generated in the second combustion chamber S2 and the above-described configuration. The force is expanded by receiving the force through the first gap G <b> 1, thereby causing the above-described deformation of the cover member 45.

  Therefore, a second gap G2 is generated between the side wall portion 44b of the partition member 44 and the second cover portion 45b of the cover member 45. The second gap G2 extends along a direction parallel to the central axis of the second igniter assembly 40. By the generation of the second gap G2, the state in which the side wall portion 44b of the partition member 44 and the second cover portion 45b of the cover member 45 are in close contact with each other is released.

  Thus, a first communication passage defined by the first gas passage hole 44a1, the first gap G1, and the second gap G2 is formed between the second combustion chamber S2 and the first combustion chamber S1. Will be. Therefore, the second combustion chamber S2 and the first combustion chamber S1 communicate with each other via the first communication passage.

  Accordingly, as indicated by an arrow AR13 in the drawing, the gas generated in the second combustion chamber S2 is supplied to the first communication passage defined by the first gas passage hole 44a1, the first gap G1, and the second gap G2. By passing through the passage, it is introduced into the first combustion chamber S1. At this time, the gas is ejected from the second gap G2 toward the bottom plate 11 of the lower shell 10.

  Therefore, in the disk-type gas generator 1A according to the present embodiment, when the gas generated in the second combustion chamber S2 is introduced into the first combustion chamber S1, it is directed directly toward the inner peripheral surface of the filter 70. Will not be sprayed. Therefore, breakage of the filter 70 can be prevented.

  The gas generated in the second combustion chamber S2 and subsequently introduced into the first combustion chamber S1 via the above-described first communication passage passes through the inside of the filter 70, and at this time, heat is generated by the filter 70. While being taken away and cooled, the slag contained in the gas is removed by the filter 70 and flows into the gas discharge chamber S3, and thereafter, is discharged toward the outside of the housing through the plurality of gas discharge ports 24. You.

  In the first to third stages described above, the gas ejected from the plurality of gas ejection ports 24 to the outside of the disk-type gas generator 1A is provided adjacent to the disk-type gas generator 1A. Introduced inside the airbag to inflate and deploy the airbag.

  Here, as described above, the gas generated in the second combustion chamber S2 and subsequently introduced into the first combustion chamber S1 is ejected toward the bottom plate 11 side as described above. It is necessary that a second gap G2 extending along a direction parallel to the central axis of the second igniter assembly 40 is formed between the partition member 44 and the cover member 45.

  In order to realize this, in a state where the movement of the cover member 45 is restricted and the cover member 45 is stopped, a portion of the side wall portion 44b of the partition wall member 44 near the top wall portion 44a is closed. It is necessary that at least the state surrounded by the second covering portion 45b is maintained, and furthermore, the second covering portion 45b is deformed so as to expand, and even when the deformation is completed, the partition member 44 It is necessary that the portion of the side wall portion 44b closer to the top wall portion 44a be kept surrounded by the second cover portion 45b of the cover member 45.

  In order to satisfy these conditions, it is necessary to appropriately adjust the degree of movement and deformation of the cover member 45 described above. Here, the extent of the movement and deformation of the cover member 45 described above depends on the second igniter assembly 40 and the top plate 21 (more strictly, the top plate 21) before the operation of the disk-type gas generator 1A. And the axial length of the second cover portion 45b of the cover member 45, which covers the side wall portion 44b of the partition wall member 44, and the housing (particularly the top plate). The thickness, shape, and material of the portion 21 and the bottom plate 11 and the like, and the thickness, shape, material, and the like of the cover member 45 are mainly determined. You should keep it.

  Here, as described above, the margin of the movement of the cover member 45 is set between the top plate portion 21 and the first cover portion 45a due to the deformation of the bottom plate portion 11 and the top plate portion 21 during the operation of the disk-type gas generator 1A. Since the increase in the distance is included, the first cover portion 45a is in contact with the upper support member 62 addressed to the top plate portion 21 before the operation of the disk-type gas generator 1A. Alternatively, it may be located away from the upper support member 62.

  Based on the above, it is necessary to appropriately adjust the amount of movement and the degree of deformation of the cover member 45 so that the cover member 45 has a special shape, such as providing a weak portion of a predetermined shape in advance. And the cover member 45 can be assembled without special positioning of the cover member 45 with respect to the partition member 44. Therefore, by adopting the above-described configuration, it is possible to reduce the weight of the filter 70 without damaging the filter 70, and to provide a disk-type gas generator 1A that can be easily manufactured with a simple configuration.

  By employing the above-described configuration, when the gas generated in the second combustion chamber S2 passes through the first communication passage, it may collide with the inner wall surface of the cover member 45 that defines the first communication passage. Therefore, a secondary effect that the slag contained in the gas is effectively captured by the inner wall surface of the cover member 45 at the time of the collision can be obtained.

  Here, in a state where both the movement and the deformation of the cover member 45 at the time of the operation of the second igniter 42 are completed (that is, the state shown in FIG. 6), a space formed between the cover member 45 and the partition member 44 ( That is, the total opening area of the portion connecting the first gap G1 and the second gap G2) and the first combustion chamber S1 is equal to the total of the plurality of first gas passage holes 44a1 provided in the top wall portion 44a of the partition member 44. It is preferably larger than the opening area. With this configuration, it is possible to prevent gas from trapping in the space formed between the cover member 45 and the partition member 44, and to suppress unintended deformation of the cover member 45.

  Further, as described above, in the disk-type gas generator 1A according to the present embodiment, the second igniter assembly 40 is eccentrically arranged so that the central axis thereof does not overlap the central axis of the peripheral wall of the housing. ing. In such a configuration, the portion where the second igniter assembly 40 and the filter 70 are arranged close to each other is naturally compared to the case where the second igniter assembly 40 is arranged coaxially with the peripheral wall of the housing. However, by adopting the above-described configuration, it is possible to effectively prevent breakage of the filter 70 while disposing the second igniter assembly 40 and the filter 70 close to each other.

(Modification)
FIG. 7 is a schematic diagram showing a second stage of the operation of the disk-type gas generator according to the modification based on Embodiment 1 described above. Hereinafter, a disk-type gas generator 1A 'according to a modification will be described with reference to FIG.

  The disk-type gas generator 1A ′ according to the modification has a first cover portion 45a of the cover member 45 that is weaker than the disk-type gas generator 1A according to Embodiment 1 described above. is there. As a method of configuring the first covering portion 45a to be weak, the thickness of the first covering portion 45a may be further thinner than in the case of Embodiment 1 described above, or a score may be provided for the first covering portion 45a, This can be realized by changing the material of the cover member 45 to a material having a lower mechanical strength (for example, an aluminum alloy).

  As shown in FIG. 7, in the disk-type gas generator 1 </ b> A ′ according to the modification configured as described above, the second gas generating agent 52 burns in the second stage when the second igniter 42 operates. The cover member 45 moves toward the top plate 21 side of the upper shell 20 as a whole and the second gas generating agent 52 burns due to the pressure rise of the second combustion chamber S2 caused by the above. The first cover portion 45a of the cover member 45 is ruptured or melted due to a rise in pressure or temperature in the second combustion chamber S2, thereby forming an opening 45a1 'as shown in the first cover portion 45a. Will be done.

  This not only creates a first gap G1 between the top wall portion 44a of the partition member 44 and the first cover portion 45a of the cover member 45, but also creates a gap between the second combustion chamber S2 and the first combustion chamber S1. Thus, a second communication path defined by the first gas passage hole 44a1, the first gap G1, and the opening 45a1 'is formed. Therefore, the second combustion chamber S2 and the first combustion chamber S1 are in communication with each other via the second communication passage.

  Accordingly, as shown by an arrow AR12 'in the drawing, the gas generated in the second combustion chamber S2 is supplied to the second gas chamber 44 by the second gas defined by the first gas passage hole 44a1, the first gap G1, and the opening 45a1'. By passing through the communication passage, it is early introduced into the first combustion chamber S1. At this time, the gas is ejected from the first gap G1 toward the top plate 21 side of the upper shell 20 via the opening 45a1 '.

  Thereafter, a part of the first covering portion 45a of the cover member 45 abuts on the upper support member 62 addressed to the top plate portion 21 of the upper shell 20, so that the movement of the cover member 45 is controlled by the top plate portion 21. As a result, the cover member 45 stops. However, in the second combustion chamber S2, since the gas is continuously generated by the successive burning of the second gas generating agent 52, a large force is continuously applied to the cover member 45.

  As a result, the cover member 45 is deformed such that the second cover portion 45b of the cover member 45 expands, similarly to the first embodiment described above, and the side wall portion 44b of the partition member 44 and the cover member 45 are formed. A second gap G2 is formed between the second cover portion 45b and the second cover portion 45b. Therefore, the state in which the side wall portion 44b of the partition member 44 and the second cover portion 45b of the cover member 45 are in close contact with each other is released.

  As a result, the first gas passage hole 44a1, the first gap G1, and the second gap G2 are defined between the second combustion chamber S2 and the first combustion chamber S1 separately from the above-described second communication path. The first communication passage is formed, and the second combustion chamber S2 and the first combustion chamber S1 communicate with each other via both the first communication passage and the above-described second communication passage. Along with this, the gas generated in the second combustion chamber S2 is thereafter ejected toward the top plate 21 of the upper shell 20 and the bottom plate 11 of the lower shell 10, respectively, thereby causing the first combustion. It will be introduced into the room S1.

  Thus, also in the case of the disk-type gas generator 1A 'according to the modification, when the gas generated in the second combustion chamber S2 is introduced into the first combustion chamber S1, the inner circumference of the filter 70 is directly It is no longer sprayed on the surface. Therefore, even with such a configuration, the same effect as that described in the first embodiment can be obtained.

(Embodiment 2)
FIG. 8 is a schematic view of a disk-type gas generator according to Embodiment 2, and FIG. 9 is an exploded view showing an assembling structure of a cover member shown in FIG. 8 to a partition member. First, the configuration of the disk-type gas generator 1B according to the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 8 and 9, the disk-type gas generator 1B according to the present embodiment has a partition member 44 and a cover member 45 when compared with the disk-type gas generator 1A according to the above-described embodiment. Only in the configuration of Specifically, in the disk-type gas generator 1B according to the present embodiment, a single first gas passage hole 44a1 is provided in the top wall portion 44a of the partition member 44, and the first gas passage hole 44a1 is formed in the cover member 45. A plurality of second gas passage holes 45a1 are provided in one cover portion 45a.

  More specifically, the single first gas passage hole 44a1 provided in the top wall portion 44a of the partition member 44 allows gas generated in the second combustion chamber S2 to pass toward the space outside the partition member 44. It is provided so as to penetrate the top wall portion 44a along the thickness direction of the top wall portion 44a.

  On the other hand, the plurality of second gas passage holes 45a1 provided in the first cover portion 45a of the cover member 45 allow the gas after passing through the single first gas passage hole 44a1 to pass through the space outside the cover member 45. And is provided so as to penetrate the first covering portion 45a along the thickness direction of the first covering portion 45a.

  Here, all of the plurality of second gas passage holes 45a1 are provided at positions that do not overlap with the single first gas passage hole 44a1, so that before the operation of the disk-type gas generator 1B, The single first gas passage hole 44a1 is covered by a first cover portion 45a of the cover member 45, and the plurality of second gas passage holes 45a1 are covered by a top wall portion 44a of the partition member 44.

  The cover member 45 is attached to the partition member 44 by being externally inserted into an end of the partition member 44 on the side of the top wall portion 44a, and is preferably fixed to the partition member 44 by press-fitting. Here, by making the inside diameter of the second covering portion 45b of the cover member 45 substantially the same as the outside diameter of the side wall portion 44b of the partition member 44, the second covering portion 45b comes into pressure contact with and close contact with the side wall portion 44b. Therefore, it is possible to prevent the state where the first combustion chamber S1 and the second combustion chamber S2 communicate with each other.

  FIGS. 10 to 12 are schematic diagrams showing first to third stages during operation of the disk-type gas generator according to the present embodiment. Next, the operation of the disk-type gas generator 1B according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 10, in the first stage in which the first igniter 32 is activated, the transfer charge 36 is ignited by the activation of the first igniter 32 as in the case of the first embodiment described above. The first gas generating agent 51 is sequentially ignited and burned by a large amount of heat particles generated by the combustion and the burning of the transfer charge 36. The gas generated in the first combustion chamber S1 by the combustion of the first gas generating agent 51 reaches the plurality of gas outlets 24 via the filter 70 and the gas discharge chamber S3, and the plurality of gas outlets. The gas is ejected to the outside via 24 (see arrow AR21).

  In the first stage, the cover member 45 is pressed against the partition member 44 due to a pressure increase in the first combustion chamber S1 caused by the combustion of the first gas generating agent 51. Therefore, the top wall portion 44a and the side wall portion 44b of the partition member 44 are covered by the first cover portion 45a and the second cover portion 45b of the cover member 45, respectively, and are in close contact with the first cover portion 45a and the second cover portion 45b. State.

  As a result, the state where the second gas passage hole 45a1 provided in the first cover portion 45a of the cover member 45 is closed by the partition member 44 is maintained. For this reason, in the first stage, the first combustion chamber S1 and the second combustion chamber S2 do not become in a state of communication with each other, and the first gas generating agent 51 is added to the second gas generating agent 52 whose combustion has not yet started. The effect of the combustion of the gas is not affected.

  Next, at a timing delayed by a predetermined time from the operation of the above-described first igniter 32, the second igniter 42 is operated by receiving power from the above-described control unit.

  As shown in FIG. 11, in the second stage in which the second igniter 42 is operated, the second gas generating agent 52 is activated by the operation of the second igniter 42, as in the case of Embodiment 1 described above. It is sequentially ignited and starts burning. In addition, the cushion material 46 accommodated in the second combustion chamber S2 is burned off with the combustion of the second gas generating agent 52.

  At this time, the cover member 45 moves toward the top plate 21 of the upper shell 20 as a whole due to a pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52. With the movement of the cover member 45, not only the first gap G1 occurs between the top wall portion 44a of the partition member 44 and the first cover portion 45a of the cover member 45, but also the first cover portion 45a of the cover member 45. Of the plurality of second gas passage holes 45a1 by the top wall 44a of the partition member 44 is released.

  Accordingly, a third communication passage defined by the first gas passage hole 44a1, the first gap G1, and the second gas passage hole 45a1 is formed between the second combustion chamber S2 and the first combustion chamber S1. become. Therefore, the second combustion chamber S2 and the first combustion chamber S1 communicate with each other via the third communication passage.

  Accordingly, as indicated by an arrow AR22 in the drawing, the gas generated in the second combustion chamber S2 is discharged by the first gas passage hole 44a1, the first gap G1, and the second gas passage hole 45a1. By passing through the three-way passage, it is early introduced into the first combustion chamber S1. At this time, the gas is ejected from the first gap G1 toward the top plate 21 side of the upper shell 20 through the second gas passage hole 45a1.

  Next, as shown in FIG. 12, a part of the first covering portion 45a of the cover member 45 comes into contact with the upper support member 62 addressed to the top plate portion 21 of the upper shell 20, so that the cover member 45 Is restricted by the top plate 21, whereby the cover member 45 stops. However, in the second combustion chamber S2, since the gas is continuously generated by the successive burning of the second gas generating agent 52, a large force is continuously applied to the cover member 45.

  As a result, the cover member 45 is deformed such that the second cover portion 45b of the cover member 45 expands, similarly to the first embodiment described above, and the side wall portion 44b of the partition member 44 and the cover member 45 are formed. A second gap G2 is formed between the second cover portion 45b and the second cover portion 45b. Therefore, the state in which the side wall portion 44b of the partition member 44 and the second cover portion 45b of the cover member 45 are in close contact with each other is released.

  As a result, the first gas passage hole 44a1, the first gap G1, and the second gap G2 are defined between the second combustion chamber S2 and the first combustion chamber S1 separately from the third communication path described above. The first communication passage is formed, and the second combustion chamber S2 and the first combustion chamber S1 communicate with each other via both the first communication passage and the third communication passage. Accordingly, as indicated by an arrow AR23 in the drawing, a part of the gas generated in the second combustion chamber S2 is defined by the first gas passage hole 44a1, the first gap G1, and the second gap G2. By passing through the first communication passage, it is introduced into the first combustion chamber S1.

  Therefore, after the third stage, the gas generated in the second combustion chamber S2 is ejected toward the top plate 21 of the upper shell 20 and the bottom plate 11 of the lower shell 10, respectively. It will be introduced into one combustion chamber S1.

  As described above, also in the case of the disk-type gas generator 1B according to the present embodiment, when the gas generated in the second combustion chamber S2 is introduced into the first combustion chamber S1, the gas is directly generated in the filter 70. It is no longer sprayed toward the peripheral surface. Therefore, even with such a configuration, the same effect as that described in the first embodiment can be obtained.

  Here, in a state where both the movement and the deformation of the cover member 45 at the time of the operation of the second igniter 42 are completed (that is, a state shown in FIG. 12), a space formed between the cover member 45 and the partition member 44 ( That is, the total opening area of the portion connecting the first gap G1 and the second gap G2) and the first combustion chamber S1 is equal to the total of the plurality of first gas passage holes 44a1 provided in the top wall portion 44a of the partition member 44. It is preferably larger than the opening area. With this configuration, it is possible to prevent gas from trapping in the space formed between the cover member 45 and the partition member 44, as in the case of the first embodiment described above, and to cause unintended deformation of the cover member 45. Can be suppressed.

(Other forms, etc.)
In the first and second embodiments and the modified examples of the present invention described above, the first igniter and the second igniter are energized at different timings, so that the second igniter is shifted from the operation timing of the first igniter. Although the description has been given by exemplifying a case in which the second igniter is configured to operate at a delayed timing, by providing a delaying agent for delaying the ignition of the igniter in the ignition portion of the second igniter, the second igniter is not energized. The time required for the ignition of the igniter is extended, so that the first igniter and the second igniter are energized at the same time, and the timing of the start of combustion of the second gas generating agent is changed by the first gas generating agent. May be configured to be delayed from the combustion start timing.

  In the first and second embodiments and the modified examples of the present invention described above, the first igniter and the second igniter are attached to the bottom plate of the housing via the first and second metal holders, respectively. Although the description has been given by exemplifying the case of such a configuration, both the first igniter and the second igniter may be configured to be attached to the bottom plate portion of the housing by so-called insert molding. In that case, the disk-type gas generator will have a first holding part and a second holding part made of a resin molded part instead of the first holder and the second holder described above. The second igniter is assembled to the bottom plate of the housing via the first holding portion and the second holding portion, respectively.

  Specifically, the first holding portion can be formed by injection molding using a mold, and a fluid resin material is poured so as to fill a space between the lower shell and the first igniter. Can be provided by solidification. More specifically, the fluid resin material described above is extended from a part of the inner surface of the bottom plate to a part of the outer surface thereof through the first opening provided in the bottom plate of the lower shell. The first igniter is attached to the bottom plate portion of the housing via the first holding portion by attaching the first igniter to the base portion of the first igniter and solidifying the fluid resin material in this state. Can be assembled.

  Accordingly, the first opening is buried by the first holding portion, and the sealing performance of the portion is ensured by the first holding portion, so that the airtightness of the space inside the housing can be ensured. The terminal pin of the first igniter may be configured so that a part of the terminal pin passes through the first holding portion and is drawn out to the outside. In this case, for example, if the cup body is fixed to the first holding section by press fitting or the like by extrapolating the open end of the cup body to the first holding section, the transfer charge is ignited by the first igniter. It can also be arranged to face the part.

  Also, the second holding portion can be formed by injection molding using a mold, similarly to the first holding portion, and the fluid resin is filled so as to fill the space between the lower shell and the second igniter. It can be provided by pouring the material and solidifying it. More specifically, the fluid resin material described above is extended from a part of the inner surface of the bottom plate to a part of the outer surface thereof through the second opening provided in the bottom plate of the lower shell. The second igniter is attached to the bottom plate portion of the housing via the second holding portion by adhering the second igniter to the base portion of the second igniter and solidifying the fluid resin material in this state. Can be assembled.

  Thereby, the second opening is in a state of being buried by the second holding portion, and the sealing property at the portion is ensured by the second holding portion, so that the airtightness of the space inside the housing can be ensured. The terminal pin of the second igniter may be configured so that a part of the terminal pin passes through the second holding portion and is drawn out to the outside. Further, in this case, if the opening end of the substantially cylindrical bottomed partition member is extrapolated to the second holding portion to fix the partition member to the second holding portion by press fitting or the like, the second gas The generator may be arranged so as to face the ignition portion of the second igniter.

  Here, if the portion provided with the first opening and the second opening of the lower shell is made to protrude in a cylindrical shape toward the inside of the housing, the first holding portion, the second holding portion, and the bottom plate portion The bonding strength can be increased by increasing the fixing area between these members, and the space for forming the female connector portion inside the cylindrically bent portion of the housing can be secured.

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

  In addition, the above-described injection molding is performed using the lower shell in which an adhesive layer is provided in advance at a predetermined position on the surface of the bottom plate portion of the portion to be covered by the first holding portion and the second holding portion. Is also good. The adhesive layer can be formed, for example, by applying an adhesive in advance to a predetermined position of the bottom plate and curing the adhesive.

  With this configuration, the cured adhesive layer is located between the bottom plate portion and the first holding portion and the second holding portion, so that the first holding portion and the second holding portion formed of the resin molded portion are moved. It becomes possible to firmly adhere to the bottom plate portion. Therefore, if the adhesive layer is provided in an annular shape along the circumferential direction so as to surround the first opening and the second opening provided in the bottom plate portion, higher sealing performance can be ensured in the portion. Can also.

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

  One of the first igniter and the second igniter is fixed to the housing via a metal holder, and the other of the first igniter and the second igniter is connected to the housing via a holding portion made of a resin molded portion. It may be fixed to.

  As described above, the above-described embodiment and its modifications disclosed this time are illustrative in all aspects, and are not restrictive. The technical scope of the present invention is defined by the appended claims, and includes all modifications within the meaning and scope equivalent to the description of the appended claims.

  1A, 1A ', 1B Disc-type gas generator, 10 lower shell, 11 bottom plate, 11a first opening, 11b second opening, 12 peripheral wall, 20 upper shell, 21 top plate, 22 peripheral wall , 23 flange portion, 24 gas ejection port, 25 seal tape, 30 first igniter assembly, 31 first holder, 31a upper concave portion, 31b lower concave portion, 31c through hole, 31d, 31e caulked portion, 32 first ignition Vessel, 32a base, 32b ignition section, 32c terminal pin, 33 first seal member, 34 cup body, 34a top wall section, 34b side wall section, 34c flange section, 35 transfer chamber, 36 transfer charge, 40 second igniter Assembly, 41 second holder, 41a upper recess, 41b lower recess, 41c through hole, 41d caulked portion, 42 second igniter, 42a base, 42b point Fire part, 42c terminal pin, 43 second seal member, 44 partition member, 44a top wall part, 44a1 first gas passage hole, 44b side wall part, 44c fixing part, 45 cover member, 45a first cover part, 45a1 second Gas passage hole, 45a1 'opening, 45b second cover, 46 cushion material, 51 first gas generating agent, 52 second gas generating agent, 61 lower support member, 62 upper support member, 63 cushion material, 70 filter , G1 first gap, G2 second gap, S1 first combustion chamber, S2 second combustion chamber, S3 gas discharge chamber.

Claims (8)

A housing including a peripheral wall portion provided with a gas ejection port, a top plate portion for closing one axial end of the peripheral wall portion, and a bottom plate portion for closing the other axial end of the peripheral wall portion;
A cylindrical filter housed inside the housing such that an outer peripheral surface faces an inner peripheral surface of the peripheral wall portion,
It has a cup-like shape including a top wall portion located on the side of the top plate portion and a side wall portion facing the inner peripheral surface of the filter, and being attached to the bottom plate portion, allows a space inside the filter to be formed. A partition member for partitioning the first combustion chamber containing the first gas generating agent and the second combustion chamber containing the second gas generating agent;
A first igniter attached to the bottom plate portion so as to face the first combustion chamber, which is a space outside the partition member;
A second igniter attached to the bottom plate portion so as to face the second combustion chamber, which is a space inside the partition member,
The top wall portion is provided with a first gas passage hole for allowing gas generated in the second combustion chamber to pass toward a space outside the partition member,
An end of the partition member on the side of the top plate includes a first cover that covers the top wall, and a second cover that covers at least a portion of the side wall closer to the top wall. A cup-shaped cover member is assembled,
At the time of operation of the second igniter, due to a pressure increase in the second combustion chamber caused by combustion of the second gas generating agent, a portion of the side wall portion near the top wall portion has the The top member is deformed so that the cover member moves toward the top plate side and the second cover portion expands while at least the state surrounded by the second cover portion is maintained. A first gap is formed between the wall and the first cover, and a second gap is formed between the side wall and the second cover, which is generated in the second combustion chamber. The gas is introduced into the first combustion chamber by passing through the first communication passage defined by the first gas passage hole, the first gap, and the second gap, and being ejected toward the bottom plate portion. A gas generator.   The gas generator according to claim 1, wherein movement of the cover member during operation of the second igniter is configured to be limited by the top plate.   During the operation of the first igniter prior to the operation of the second igniter, the top plate portion is moved outward due to a pressure increase in the first combustion chamber caused by combustion of the first gas generating agent. The distance between the top plate portion and the first cover portion is increased by being deformed so as to bulge toward, and the increase in the distance is caused by the increase in the distance of the cover member during the operation of the second igniter. 3. The gas generator according to claim 2, wherein the gas generator is configured to be included in a travel margin.   At the time of operation of the second igniter, breakage or melting occurs in the first cover portion due to a pressure rise or a temperature rise in the second combustion chamber caused by combustion of the second gas generating agent. As a result, an opening is formed in the first cover portion, and accordingly, gas generated in the second combustion chamber is introduced into the first combustion chamber via the first communication passage. In addition, by passing through the first communication passage defined by the first gas passage hole, the first gap, and the opening, the gas is ejected toward the top plate side, so that the gas flows into the first combustion chamber. A gas generator according to any of the preceding claims, which is introduced. The second gas passage for passing the gas after passing through the first gas passage hole toward the space outside the cover member is provided in the first cover portion at a position not overlapping the first gas passage hole. Holes are provided,
During the operation of the first igniter prior to the operation of the second igniter, the first covering portion is moved due to a pressure increase in the first combustion chamber caused by combustion of the first gas generating agent. By being pressed against the top wall, the second gas passage hole is closed by the top wall,
When the second igniter is operated, the cover member moves toward the top plate side due to a pressure increase in the second combustion chamber caused by combustion of the second gas generating agent. Thereby, the blockage of the second gas passage hole by the top wall portion is released, and the gas generated in the second combustion chamber passes through the first communication passage along with the first combustion chamber. In addition to the above, the gas is ejected toward the top plate by passing through a third communication passage defined by the first gas passage hole, the first gap, and the second gas passage hole. The gas generator according to claim 1, wherein the gas is introduced into the first combustion chamber.   A portion connecting a space formed between the cover member and the partition member and the first combustion chamber in a state after the movement and deformation of the cover member are both completed when the second igniter is operated. The gas generator according to any one of claims 1 to 5, wherein a total opening area of the first gas passage hole is larger than a total opening area of the first gas passage hole.   The gas generator according to any one of claims 1 to 6, wherein the cover member is press-fitted into the partition member so that the second cover portion comes into pressure contact with the side wall portion. The filter is arranged coaxially with the housing so that a center axis of the filter overlaps a center axis of the peripheral wall portion,
The gas generator according to any one of claims 1 to 7, wherein the partition member is eccentrically arranged with respect to the housing such that a center axis of the side wall portion does not overlap a center axis of the peripheral wall portion.

Images