JP7175173B2 - gas generator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator incorporated in an occupant protection device for protecting an occupant in the event of a vehicle collision, 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, from the viewpoint of protecting occupants of automobiles and the like, airbag devices, which are occupant protection devices, have been widely used. Airbag systems are installed to protect passengers from the impact that occurs in the event of a vehicle collision. By inflating and deploying the airbag instantaneously in the event of a vehicle collision, the airbag acts as a cushion for the passenger. It accepts the body.

The gas generator is incorporated in this airbag system, and when a vehicle or other vehicle collides, the igniter is ignited by the energization of the control unit, and the flame generated in the igniter burns the gas generating agent to instantly generate a large amount of gas. , the device that inflates and deploys the airbag.

Gas generators have a variety of configurations, but as a gas generator that is particularly preferably incorporated in a driver-side airbag system, a passenger-side airbag system, etc., a short, roughly circular shape with a relatively large outer diameter is used. There is a columnar disk-shaped gas generator. This disc-type gas generator also has various structures, one of which is a dual-structure disc-type gas generator.

A dual-structure disk-type gas generator divides a combustion chamber formed inside a cylindrical filter installed inside a housing into two chambers, and fills each of the two chambers with a gas generating agent. Two igniters are provided in association with these two chambers, and normally one igniter operates later than the other igniter. This dual-structure disk-type gas generator can maintain a desired gas output for a long time compared to a single-structure disk-type gas generator having only a single combustion chamber and a single igniter. A more suitable gas output characteristic can be obtained by deploying the bag.

In the dual structure disk type gas generator, a pressure partition is provided inside the housing to divide the combustion chamber into two chambers. This pressure bulkhead is generally composed of a cup-shaped member in many cases. Defined as a combustion chamber, the space inside the pressure bulkhead is defined as a second combustion chamber containing a second gas generant having a delayed combustion start.

Here, the cylindrical side wall portion of the cup-shaped pressure partition is provided with a gas passage hole for allowing the gas generated in the second combustion chamber to be ejected to the outside through the first combustion chamber. However, when the first gas generating agent burns in the first combustion chamber, the gas passage hole affects the second gas generating agent accommodated in the second combustion chamber, which has not yet started burning. It is necessary to be sealed so that there is no accident.

For this reason, for example, in a dual-structure disk-type gas generator, the pressure partition wall is divided into two members, a cup member including the closed end and a tubular member to which the cup member is assembled so as to be relatively movable. By providing the gas passage hole in the peripheral wall of the cup member, the gas passage hole is closed by the cylindrical member when the first gas generating agent is burned, and when the second gas generating agent is burned, the second gas passage hole is closed. When the cup member moves relative to the cylindrical member due to the pressure generated by the combustion of the gas generating agent, the gas passage hole is exposed and the second combustion chamber and the first combustion chamber communicate with each other. may be configured.

Documents disclosing such a dual-structure disk-shaped gas generator include, for example, Japanese Patent Application Laid-Open Publication No. 2009-517263 (Patent Document 1).

Japanese translation of PCT publication No. 2009-517263

However, in the case of a dual-structure disk-type gas generator as disclosed in Patent Document 1, the residue (slag) generated by the combustion of the gas generating agent is not sufficiently collected by the filter. There can be a problem of being ejected into the airbag. This is because when the second gas generating agent burns, the first gas generating agent burns first and the entire gas generator is already in a heated state, so the second gas generating agent does not generate the first gas. This is due to the fact that it burns under higher temperature and pressure conditions than other agents.

That is, when the gas generating agent is combusted under conditions of higher temperature and pressure, the generated slag becomes finer particles. Therefore, even if the slag generated by burning the first gas generating agent can be effectively collected by the filter, finer particulate slag generated by burning the second gas generating agent may not be effectively collected by the filter and may pass through the filter as a result.

In order to reliably collect even this fine particulate slag with a filter, it is conceivable to increase the density of the filter to enhance its slag collecting function. However, in such a configuration, not only does the weight of the disk-type gas generator as a whole increase with the increase in the weight of the filter, but also the flow resistance of the filter against the passing gas increases. As a result, a problem may arise that it becomes difficult to obtain a desired gas output.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a dual structure gas generator capable of suppressing an increase in the weight of the filter and enhancing the slag collection function. and

A gas generator according to the present invention comprises a housing, a filter, a partition, a first igniter and a second igniter. The housing includes a peripheral wall portion provided with a gas ejection port, a top plate portion closing one axial end of the peripheral wall portion, and a bottom plate portion closing the other axial end of the peripheral wall portion. . The filter is a cylindrical member housed inside the housing so that its outer peripheral surface faces the inner peripheral surface of the peripheral wall portion. The partition part has a cup-like shape as a whole with a closed end on the side of the top plate part, and is assembled to the bottom plate part so that the space inside the filter is filled with the first gas generating agent. and a second combustion chamber containing a second gas generating agent. The first igniter is attached to the bottom plate portion so as to face the first combustion chamber, which is a space outside the partition portion. The second igniter is attached to the bottom plate portion so as to face the second combustion chamber, which is a space inside the partition portion. The partition portion has openings at both ends in the axial direction and includes a tubular partition member fixed to the bottom plate portion, and a lid member assembled to the partition member. The lid member includes a closing portion that constitutes the closed end by covering the opening of the partition wall member located on the top plate portion side, and extends from the closing portion along the axial direction of the partition portion. and a cylindrical portion that is in close contact with a portion of the peripheral surface of the partition member near the top plate portion. At least one of a peripheral surface of the tubular portion that is in close contact with the partition member and a peripheral surface of a portion of the partition member that is in close contact with the tubular portion is provided with the first combustion chamber and the second combustion chamber. A gas passage groove is provided for communicating with the When the second igniter is not in operation, the gas passage groove is not in communication with either or both of the first combustion chamber and the second combustion chamber. In the gas generator according to the present invention, when the second igniter is activated, the pressure rise in the second combustion chamber caused by the combustion of the second gas generating agent causes the cylinder to As the lid member moves toward the top plate portion while the shape portion is maintained in close contact with the partition member, the gas passage groove is separated from the first combustion chamber and the second combustion chamber. communicate with each other. As a result, gas generated in the second combustion chamber passes through the gas passage groove and is introduced into the first combustion chamber.

In the gas generator according to the present invention, the gas passage groove may be provided on the outer peripheral surface of the tubular portion so as to reach the end portion of the tubular portion on the bottom plate portion side, In this case, by inserting the lid member into the partition member, the outer peripheral surface of the cylindrical portion provided with the gas passage groove is aligned with the inner peripheral surface of the partition member near the top plate portion. It is preferable that they are in close contact with each other.

In the gas generator according to the present invention, the gas passage groove may be provided on the inner peripheral surface of the tubular portion so as to reach the end portion of the tubular portion on the bottom plate portion side. In that case, the lid member is fitted onto the partition member so that the inner peripheral surface of the cylindrical portion provided with the gas passage grooves is aligned with the outer peripheral surface of the partition member near the top plate portion. is preferably in close contact with.

In the gas generator according to the present invention, the gas passage groove may be provided on the outer peripheral surface of the partition member so as to reach the end portion of the partition member on the top plate portion side. In this case, the cover member is fitted onto the partition member so that the outer peripheral surface of the partition member provided with the gas passage groove, which is closer to the top plate portion, is brought into close contact with the inner peripheral surface of the cylindrical portion. preferably.

In the gas generator according to the present invention, the gas passage groove may be provided on the inner peripheral surface of the partition member so as to reach the end portion of the partition member on the top plate portion side, In this case, by inserting the lid member into the partition member, the inner peripheral surface of the partition member provided with the gas passage groove, which is closer to the top plate portion, is aligned with the outer peripheral surface of the cylindrical portion. It is preferable that they are in close contact with each other.

In the gas generator according to the present invention, a plurality of gas passage grooves may be provided so as to be spaced apart from each other in the circumferential direction of the partition portion. may extend along the axial direction of the partition.

In the gas generator according to the present invention, the peripheral surface of the partition member and the peripheral surface of the cylindrical portion of the lid member are in close contact with the partition portion over the entire circumference of the partition portion in the circumferential direction. An all-around contact area may be provided. In this case, when the second igniter is activated, the cylindrical portion is kept in close contact with the partition member as the lid member moves toward the top plate portion. , It is preferable that the close contact between the partition member and the lid member in the all-around contact area is released.

In the gas generator according to the present invention, it is preferable that movement of the lid member during actuation of the second igniter is restricted by the top plate portion.

In the gas generator according to the present invention, when the first igniter is actuated, the pressure rise in the first combustion chamber caused by the combustion of the first gas generating agent causes the above-mentioned The plate portion may be deformed so as to swell outward, thereby increasing the distance between the top plate portion and the closing portion. In that case, it is preferable that the increase in the distance is included in the movement allowance of the lid member when the second igniter is activated.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the gas generator of dual structure which can improve the collection function of a slag, suppressing the increase in the weight of a filter.

1 is a schematic diagram of a disk-shaped gas generator according to Embodiment 1. FIG. FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. 1; FIG. 2 is a partially broken side view of the lid member shown in FIG. 1; FIG. 2 is an exploded perspective view showing an assembly structure of the partition shown in FIG. 1; FIG. 2 is a schematic diagram showing the first stage of operation of the disk-shaped gas generator shown in FIG. 1; FIG. 2 is a schematic diagram showing a second stage of operation of the disk-type gas generator shown in FIG. 1; FIG. 3 is a partially broken side view of a cover member according to a modified example of the disk-shaped gas generator shown in FIG. 1; 4 is a schematic diagram of a disk-shaped gas generator according to Embodiment 2. FIG. 3 is a schematic diagram of a disk-shaped gas generator according to Embodiment 3. FIG. FIG. 10 is a schematic diagram showing a second stage of operation of the disk-type gas generator shown in FIG. 9; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 4; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 5; FIG. 13 is an exploded perspective view showing an assembly structure of the partition shown in FIG. 12; FIG. 13 is a schematic diagram showing a second stage of operation of the disk-shaped gas generator shown in FIG. 12; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 6; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 7; FIG. 17 is a schematic diagram showing a second stage of operation of the disk-type gas generator shown in FIG. 16; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 8;

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

(Embodiment 1)
FIG. 1 is a schematic diagram of a disk-type gas generator according to Embodiment 1, and FIG. 2 is a schematic cross-sectional diagram taken along line II-II shown in FIG. 3 is a partially broken side view of the lid member shown in FIG. 1, and FIG. 4 is an exploded perspective view showing the assembly structure of the partition shown in FIG. First, the configuration of a disk-shaped gas generator 1A according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG.

As shown in FIGS. 1 and 2, the disk-shaped gas generator 1A has a short, substantially cylindrical housing with one axial end and the other end 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 are provided as internal components. 70 and the like are accommodated.

As shown in FIG. 1, the housing includes a lower shell 10 and an upper shell 20. As shown in FIG. Each of the lower shell 10 and the upper shell 20 is a press-formed product formed by pressing a rolled metal plate member, for example. As the metal plate-shaped members forming the lower shell 10 and the upper shell 20, for example, metal plates made of stainless steel, iron steel, aluminum alloy, stainless alloy, etc. are used. A so-called high-strength steel sheet that does not cause damage 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 a housing is constructed by combining and joining these opening surfaces facing each other. The lower shell 10 has a bottom plate portion 11 and a peripheral wall portion 12 , and the upper shell 20 has a top plate portion 21 , a peripheral wall portion 22 and a flange portion 23 .

The upper end of the peripheral wall portion 12 of the lower shell 10 is press-fitted by being inserted into the lower end of the peripheral wall portion 22 of the upper shell 20 . Further, the peripheral wall portion 12 of the lower shell 10 and the peripheral wall portion 22 of the upper shell 20 are joined at or near their abutting portions, thereby fixing the lower shell 10 and the upper shell 20. ing. Electron beam welding, laser welding, friction welding, or the like can be suitably used for joining the lower shell 10 and the upper shell 20 .

As a result, the portion of the peripheral wall portion of the housing near the bottom plate portion 11 is formed by the peripheral wall portion 12 of the lower shell 10, and the portion of the peripheral wall portion of the housing near the top plate portion 21 is formed 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 the bottom plate portion 11 of the lower shell 10 and the top plate portion 21 of the upper shell 20, respectively.

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

At predetermined positions of the bottom plate portion 11 of the lower shell 10, a first opening portion 11a and a second opening portion 11b are provided. A first igniter assembly 30 is assembled to the bottom plate portion 11 of the lower shell 10 so as to close the first opening portion 11a, and a second igniter assembly 30 is assembled to close the second opening portion 11b. An assembly 40 is assembled. Here, the first opening portion 11a is a portion for exposing a first female connector portion (to be described later) provided at the lower end of the first igniter assembly 30 to the outside, and the second opening portion 11b is , a portion for exposing a second female connector portion, which will be described later, provided at the lower end of the second igniter assembly 40 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. By assembling the first igniter 32, the cup body 34, etc. to the first holder 31, the first igniter Assembly 30 is constructed as an integral part.

The first holder 31 is made of a member having a substantially cylindrical outer shape, and is made of metal such as stainless steel, steel, aluminum alloy, or stainless alloy. An upper concave portion 31a is provided on the upper surface of the first holder 31 positioned on the top plate portion 21 side, and a lower concave portion 31b is provided on the lower surface of the first holder 31 positioned on the bottom plate portion 11 side. there is Further, through holes 31c are provided in portions of the first holder 31 forming the bottom of the upper recess 31a and the bottom of the lower recess 31b so as to reach the upper recess 31a and the lower recess 31b.

Crimped portions 31d and 31e are provided on the upper surface of the first holder 31 so as to surround the upper concave portion 31a. Of these, the crimped portion 31d arranged on the inner side is a portion for crimping and fixing the first igniter 32 to the first holder 31, and the crimped portion 31e arranged on the outer side of these crimps the cup body 34. This is a portion for caulking and fixing to the first holder 31 .

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

More specifically, the ignition portion 32b includes a cup-shaped squib cup, and an embolus that closes the open end of the squib cup and holds a pair of terminal pins 32c inserted therethrough. The above-described resistor is attached so as to connect the tips of a pair of terminal pins 32c inserted into the squib cup, and an ignition charge is placed in the squib cup so as to surround or be close to the resistor. It has a loaded configuration.

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. Note that the squib cups and emboli described above are generally made of metal or plastic.

When a collision is detected, a predetermined amount of current flows through the resistor through 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 high temperature flame produced by the combustion ruptures the squib cup containing the ignition charge. The time from when the current flows through the resistor until the first igniter 32 is activated is generally 2 [ms] or less when the nichrome wire is used for the resistor.

In the first igniter 32, the pair of terminal pins 32c are inserted into the through holes 31c of the first holder 31 from above, and the base portion 32a is accommodated in the upper recessed portion 31a of the first holder 31 and fixed. It is fixed to the first holder 31 by bending the crimped portion 31d described above.

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 , and thereby a seal between the first holder 31 and the first igniter 32 is provided. By closing the gap between them, the airtightness of the part is ensured. In addition, the fixing method of the 1st igniter 32 is not restricted to the fixing method using the crimping|crimped part 31d mentioned above, You may utilize another fixing method.

The cup body 34 has a cup shape with an open end on the bottom plate portion 11 side, and includes a transfer chamber 35 in which a transfer charge 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 that extends radially outward from the opening end side portion of the side wall portion 34b. there is

The cup body 34 is assembled to the first holder 31 so that a transfer chamber 35 formed therein faces the ignition portion 32b of the first igniter 32. More specifically, the flange portion 34c is It is fixed to the first holder 31 by bending the crimped portion 31 e described above while it is held against the upper surface of the first holder 31 .

The cup body 34 has an opening in neither the top wall portion 34a nor the side wall portion 34b, and surrounds a transfer chamber 35 provided therein. When the transfer charge 36 is ignited by the operation of the first igniter 32, the cup body 34 bursts or melts as the pressure rises in the transfer chamber 35 and the conduction of the generated heat. Those having relatively low mechanical strength are used.

Therefore, as the cup body 34, metal members such as aluminum and aluminum alloys, thermosetting resins such as epoxy resins, polybutylene terephthalate resins, polyethylene terephthalate resins, polyamide resins (for example, nylon 6 and nylon 66 etc.), a member made of a thermoplastic resin such as a polypropylene sulfide resin, a polypropylene oxide resin, or the like is preferably used.

In addition to the above, the cup body 34 is made of a metal member with high mechanical strength such as iron or copper, and has an opening in its side wall. It is also possible to use one provided with a sealing member so as to be closed. In this case, the combustion of transfer charge 36 cracks or melts the seal member, thereby opening the opening. Here, as the sealing member described above, a sealing tape that can be attached to the cup body so as to close the opening, or a ring-shaped sealing body that can be assembled by press-fitting into the cup body so as to close the opening etc. is available. As the sealing tape, for example, an aluminum foil coated with an adhesive member on one side can be suitably used, and as the ring-shaped sealing body, a press-molded product made of aluminum including a thin plate cylindrical portion for closing the opening described above, or the like can be used. can be preferably used. Moreover, the fixing method of the cup body 34 is not limited to the fixing method using the caulked portion 31e described above, and other fixing methods may be used.

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

As the transfer charge 36, a powdery one, a binder molded into a predetermined shape, or the like is used. The shape of transfer charge 36 formed by the binder includes various shapes such as granular, cylindrical, sheet, spherical, single-hole cylindrical, multi-hole cylindrical, and tablet-like.

The lower end of the first holder 31 is inserted from above into the first opening 11a provided in the bottom plate portion 11 of the lower shell 10, and is fixed by joining the outer peripheral edge thereof to the bottom plate portion 11. ing. As a result, the first igniter assembly 30 integrated by assembling the first igniter 32 and the cup body 34 to the first holder 31 is fixed to the lower shell 10, 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. Electron beam welding, laser welding, friction welding, or the like can be suitably used to join the bottom plate portion 11 and the first holder 31 together.

A pair of terminal pins 32c of the first igniter 32 are exposed and located in the lower recessed portion 31b of the first holder 31 . As a result, the lower concave portion 31b and the pair of terminal pins 32c form the above-described first female connector portion.

The first female connector portion is a portion for receiving a male connector (not shown) of a harness for connecting the first igniter 32 and a control unit (not shown). The first female connector portion is exposed to the outside of the housing, and the male connector described above is inserted into the first female connector portion to electrically connect the core wire of the harness and the terminal pin 32c. Continuity will be realized.

The second igniter assembly 40 mainly includes a second holder 41 , a second igniter 42 , a second seal member 43 , a partition portion 44 and a second gas generating agent 52 . The second holder 41 constitutes the base of the second igniter assembly 40. By assembling the second igniter 42 and the partition part 44 and the like to the second holder 41, the second igniter Assembly 40 is constructed as an integral part.

The second holder 41 is made of a member having a substantially cylindrical outer shape, and is made of metal such as stainless steel, steel, aluminum alloy, or stainless alloy. An upper concave portion 41a is provided on the upper surface of the second holder 41 positioned on the top plate portion 21 side, and a lower concave portion 41b is provided on the lower surface of the second holder 41 positioned on the bottom plate portion 11 side. there is Further, through holes 41c are provided in the second holder 41 in portions forming the bottom of the upper recess 41a and the bottom of the lower recess 41b so as to reach the upper recess 41a and the lower recess 41b.

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

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

In the second igniter 42, the pair of terminal pins 42c are inserted from above into the through holes 41c of the second holder 41, and the base portion 42a is housed in the upper recessed portion 41a of the second holder 41 and fixed. It is fixed to the second holder 41 by bending the caulked portion 41d described above.

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 , thereby separating the second holder 41 and the second igniter 42 . By closing the gap between them, the airtightness of the part is ensured. In addition, the fixing method of the 2nd igniter 42 is not restricted to the fixing method using the crimping|crimped part 41d mentioned above, You may utilize another fixing method.

The partition part 44 has a partition member 45 and a lid member 46, and the partition member 45 and the lid member 46 are combined to form a cup-like shape as a whole. The partition part 44 functions as a pressure partition that divides the space inside the housing and inside the filter 70 into two chambers.

As shown in FIGS. 1 and 2, the space inside the housing and inside the filter 70 is divided by the partition 44 into a space outside the partition 44 and a space inside the partition 44. The former space is defined as the first combustion chamber S1, and the latter space is defined as the second combustion chamber S2.

As shown in FIG. 1, the partition part 44 is assembled to the second holder 41 so that the second combustion chamber S2 formed therein faces the ignition part 42b of the second igniter 42. As shown in FIG. More specifically, as will be described later, the fixing portion 45 a provided at the lower end of the partition member 45 of the partition portion 44 is press-fitted into the second holder 41 , so that the partition portion 44 is moved through the second holder 41 . is fixed to the bottom plate portion 11.

A second gas generating agent 52 is accommodated in the second combustion chamber S2 located inside the partition portion 44 . The second gas generating agent 52 is a chemical that is ignited by hot particles generated by the operation of the second igniter 42 and burns to generate gas. Details of the second gas generating agent 52 will be described later.

As shown in FIGS. 1 and 4, the partition member 45 has a tubular shape with openings at both ends in the axial direction. The partition member 45 is arranged so that its axial direction is parallel to the axial direction of the housing. It functions as a fixed portion 45a.

More specifically, the fixing portion 45a is press-fitted into the second holder 41 as described above, and thereby the partition member 45 is fixed to the second holder 41, thereby forming the partition portion 44 including the partition member 45. is attached to the bottom plate portion 11 . The partition member 45 is made of a metal member such as stainless steel, iron steel, aluminum alloy, or stainless alloy.

As shown in FIGS. 1, 3 and 4, the lid member 46 has a bottomed tubular shape with an open end on the bottom plate portion 11 side, and the top plate portion 21 side of the partition member 45 is closed. Mounted on the open end. Like the partition member 45, the lid member 46 is made of a metal member such as stainless steel, iron steel, aluminum alloy, or stainless alloy. Here, in the present embodiment, the lid member 46 is configured by a forged and cut product formed by combining forging and cutting.

The lid member 46 includes a disk-shaped closing portion 46a that constitutes the closed end of the partition portion 44 by covering the opening of the partition member 45 located on the top plate portion 21 side, and the bottom plate portion 11 side from the peripheral edge of the closing portion 46a. and a cylindrical tubular portion 46b that covers the inner peripheral surface of the portion of the partition member 45 closer to the top plate portion 21 by extending toward. A stopper portion 46c is provided on the peripheral edge of the closing portion 46a of the lid member 46 so as to protrude radially outward and contact the axial end portion of the partition member 45 on the top plate portion 21 side. .

The lid member 46 is assembled to the partition member 45 by being inserted into the above-described open end of the partition member 45, and is preferably fixed to the partition member 45 by press fitting. As a result, the outer peripheral surface of the tubular portion 46b of the lid member 46 is in close contact with the inner peripheral surface of the portion of the partition member 45 near the top plate portion 21 . Here, the abutment portion 46c described above functions as a positioning portion when the lid member 46 is assembled to the partition member 45, and the abutment portion 46c abuts on the above-described axial end portion of the partition member 45. By making contact, the assembly position of the lid member 46 with respect to the partition member 45 is optimized.

A plurality of gas passage grooves 46b1 are provided on the outer peripheral surface of the cylindrical portion 46b that is in close contact with the partition member 45. As shown in FIG. The plurality of gas passage grooves 46b1 are positioned apart from each other in the circumferential direction of the cylindrical portion 46b, and all extend along the axial direction of the cylindrical portion 46b. One end of each of the plurality of gas passage grooves 46b1 reaches the bottom plate portion 11 side end of the tubular portion 46b, and the other end of each of the plurality of gas passage grooves 46b1 reaches the top plate portion of the tubular portion 46b. It is positioned near the end on the 21 side.

Here, as shown in FIG. 3, the tubular portion 46b of the lid member 46 is divided into two regions R1 and R2 in the axial direction of the tubular portion 46b. The region R1 is a region in which the gas passage groove 46b1 is provided at any position in the circumferential direction of the cylindrical portion 46b, and is located near the end of the cylindrical portion 46b on the bottom plate portion 11 side. On the other hand, the region R2 is a region in which the gas passage groove 46b1 is not provided at any position in the circumferential direction of the cylindrical portion 46b, and is located near the end of the cylindrical portion 46b on the top plate portion 21 side. there is

Among them, the region R1 includes, in a state after the lid member 46 is assembled to the partition member 45, a portion where the partition member 45 and the lid member 46 are in close contact alternately along the circumferential direction, A portion where the member 46 is not in close contact is formed. A gap defined by the gas passage groove 46b1 and the wall surface of the partition member 45 facing the gas passage groove 46b1 is located in the portion where the partition member 45 and the lid member 46 are not in close contact. This gap allows the first combustion chamber S1 and the second combustion chamber S2 to communicate with each other when the second igniter 42 is activated (that is, after the disk-type gas generator 1A is activated and in the second stage described later). The details of the channel will be described later.

On the other hand, the region R2 of these regions is a full-circumference contact area in which the partition member 45 and the lid member 46 are in close contact with each other over the entire circumferential direction of the partition portion 44 after the lid member 46 is assembled to the partition member 45 . form a region. By providing this all-around contact area in the partition portion 44, when the second igniter 42 is not in operation (that is, before the operation of the disk-type gas generator 1A and after the operation of the disk-type gas generator 1A) In addition, in the first step described later), the non-communication state between the first combustion chamber S1 and the second combustion chamber S2 is more reliably maintained, the details of which will be described later. do.

As shown in FIG. 1, the lower end of the second holder 41 is inserted from above into the second opening 11b provided in the bottom plate portion 11 of the lower shell 10, and the outer peripheral edge thereof It is fixed by joining. As a result, the second igniter assembly 40 integrated by assembling the second igniter 42 and the partition portion 44 to the second holder 41 is fixed to the lower shell 10, 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. Electron beam welding, laser welding, friction welding, or the like can be suitably used to join the bottom plate portion 11 and the second holder 41 together.

A pair of terminal pins 42c of the second igniter 42 are exposed and located in the lower concave portion 41b of the second holder 41 . As a result, the lower recessed portion 41b and the pair of terminal pins 42c form the second female connector portion described above.

The second female connector portion is a portion for receiving a male connector (not shown) of a harness for connecting the second igniter 42 and a control unit (not shown). The second female connector portion is exposed to the outside of the housing, and the above-described male connector is inserted into the second female connector portion to electrically connect the core wire of the harness and the terminal pin 42c. Continuity will be realized.

As shown in FIGS. 1 and 2, the space inside the housing accommodates a filter 70 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 its central axis coincides with the central axis of the peripheral wall portion of the housing. As a result, the outer peripheral surface of the filter 70 faces the inner peripheral surface of the peripheral wall portion of the housing.

The filter 70 surrounds the first igniter assembly 30 and the second igniter assembly 40 so that the first igniter assembly 30 and the second igniter assembly 40 are arranged in the inner space. are placed in As a result, the first combustion chamber S<b>1 accommodating the first gas generating agent 51 is formed in the space inside the filter 70 and outside the partition portion 44 . The filter 70 is arranged at a predetermined distance from the peripheral wall of the housing, thereby forming a gas discharge chamber S3 between the peripheral wall of the housing and the filter 70. As shown in FIG.

As the filter 70, for example, a metal wire rod such as stainless steel or iron steel wound and sintered, or a mesh material woven with a metal wire rod pressed by pressing can be used. As the mesh material, specifically, a knitted wire mesh, a plain-woven wire mesh, an aggregate of crimp-woven metal wires, or the like can be used.

As the filter 70, a wound perforated metal plate or the like can also be used. In this case, the perforated metal plate may be, for example, an expanded metal obtained by cutting a metal plate in a zigzag pattern and expanding the cuts to form holes to form a mesh, or a metal plate with holes and A hook metal or the like is used in which burrs formed on the periphery of the hole are flattened by crushing them. In this case, the size and shape of the holes to be formed can be changed as needed, and holes of different sizes and shapes may be included on the same metal plate. 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 alloys thereof can also be used.

The filter 70 functions as a cooling means for cooling the gas by removing high-temperature heat from the gas when the gas generated in the first combustion chamber S1 and the second combustion chamber S2 passes through the filter 70. At the same time, it also 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 gas generated in the first combustion chamber S1 and the second combustion chamber S2 is configured to pass through the filter 70 without fail. it becomes necessary to

Here, the first igniter assembly 30 is eccentrically arranged so that its central axis does not overlap the central axis of the peripheral wall of the housing, and the second igniter assembly 40 also has its central axis aligned with the peripheral wall of the housing. It is eccentrically arranged so as not to overlap the central axis of the housing (that is, the central axis of the partition 44 (more precisely, the central axis of the partition member 45) does not overlap the central axis of the peripheral wall of the housing). With this configuration, it is possible to prevent a dead space from being generated inside the housing (especially the space inside the filter 70), so that the disk-type gas generator 1A can be made compact as a whole.

A first gas generating agent 51 is accommodated in the first combustion chamber S1. More specifically, the first gas generating agent 51 is contained in the 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 , the space inside the filter 70 and adjacent to the side wall portion of the partition portion 44 of the second igniter assembly 40 . The first gas generating agent 51 is a chemical that is ignited by hot particles generated by the operation of the first igniter 32 and burns to generate gas.

As the first gas generating agent 51 and the second gas generating agent 52 described above, it is preferable to use a non-azide gas generating agent. 51 and a second gas generant 52 are formed.

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

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

Additives include binders, slag forming agents, and combustion modifiers. As the binder, for example, organic binders such as polyvinyl alcohol, metal salts of carboxymethyl cellulose and stearates, and inorganic binders such as synthetic hydrotalcite and acid clay can be preferably used. In addition, binders include polysaccharide derivatives such as hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guar gum, polyvinylpyrrolidone, polyacrylamide, and starch. Alternatively, 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, etc. can be suitably used. Metal oxides, ferrosilicon, activated carbon, graphite and the like can be suitably used as combustion modifiers.

The shape of the molded body of the gas generating agent includes various shapes such as granules, pellets, granules such as cylinders, and discs. In addition, in the case of a columnar shape, a perforated shaped body having through holes inside the shaped body (for example, a single-hole cylindrical shape, a porous cylindrical shape, etc.) is also used. These shapes are preferably selected appropriately according to the specifications of the airbag device in which the disk-type gas generator 1A is incorporated. It is preferable to select the optimum shape according to the specifications. In addition to the shape of the gas generating agent, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear burning velocity, pressure index, etc. 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. The first gas generating agent 51 and the second gas generating agent 52 may have the same shape and size, or may have different shapes and sizes.

The peripheral wall portion 22 of the upper shell 20 facing the filter 70 is provided with a plurality of gas ejection ports 24 facing the gas discharge chamber S3. The plurality of gas ejection ports 24 are for discharging the gas that has passed through the filter 70 to the outside of the housing via the gas discharge chamber S3.

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

As shown in FIG. 1, a lower support member 61 is arranged at the end portion of the first combustion chamber S1 that is located on the bottom plate portion 11 side. The lower support member 61 has an annular shape, and is placed between the filter 70 and the bottom plate portion 11 so as to cover the boundary portion between the filter 70 and the bottom plate portion 11 . Thereby, the lower support member 61 is positioned between the bottom plate portion 11 and the first gas generating agent 51 in the vicinity of the end portion of the first combustion chamber S1.

The lower support member 61 is a member for fixing the filter 70 to the housing, and also allows 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 the water from flowing out from the gap between the lower end of the filter 70 and the bottom plate portion 11 . The lower support member 61 is formed, for example, by pressing a metal plate member, and is preferably made of a steel plate such as ordinary steel or special steel (for example, cold-rolled steel plate, stainless steel plate, etc.). It is composed of the following members.

An upper support member 62 is arranged at an end portion of the first combustion chamber S1 that is located on the top plate portion 21 side. The upper support member 62 has a substantially disk-like shape, and is placed between the filter 70 and the top plate portion 21 so as to cover the boundary portion between the filter 70 and the top plate portion 21 . there is Thereby, the upper support member 62 is positioned between the top plate portion 21 and the first gas generating agent 51 in the vicinity of the end portion of the first combustion chamber S1.

The upper support member 62 is a member for fixing the filter 70 to the housing, and prevents gas generated in the first combustion chamber S1 and the second combustion chamber S2 from passing through the inside of the filter 70 during operation. It also functions as an outflow preventing means for preventing outflow from the gap between the upper end of the filter 70 and the top plate portion 21 . Like the lower support member 61 described above, the upper support member 62 is formed, for example, by pressing a plate-like member made of metal, and is preferably made of a steel plate such as ordinary steel or special steel (for example, cold-rolled steel plate, stainless steel plate, etc.).

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

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

If it is necessary to take some measure to prevent the second gas generating agent 52 from being crushed by vibration, it can be realized by using a cushioning material, as in the case of the first gas generating agent 51 . In that case, a disk-shaped cushion material is arranged between the closing portion 46 a of the lid member 46 and the second gas generating agent 52 , or an annular disk-shaped cushion material surrounds the second igniter 42 . It can either be placed between the upper surface of the second holder 41 of the part and the second gas generant 52 . When the former configuration is adopted, the second gas generating agent 52 is pressed toward the bottom plate portion 11 by the cushioning material. The generating agent 52 is pressed toward the top plate portion 21 side. Both the former configuration and the latter configuration may be adopted. Here, as the cushion material for pressing the second gas generating agent 52 described above, the same material as the cushion material 63 for pressing the first gas generating agent 51 can be used.

5 and 6 are schematic diagrams showing the first and second stages of operation of the disk-shaped gas generator according to this embodiment, respectively. Next, operation of the disk-shaped gas generator 1A according to the present embodiment will be described with reference to FIGS. 5 and 6. FIG.

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

As shown in FIG. 5, in the first stage in which the first igniter 32 operates, the ignition charge filled in the ignition portion 32b of the first igniter 32 is ignited by being heated by the resistor. The ignition part 32b bursts due to the combustion of the gunpowder. As a result, the transfer charge 36 housed inside the cup body 34 is ignited and burned.

When the transfer charge 36 burns, a large amount of thermal particles are generated inside the transfer chamber 35, and the temperature and pressure of the transfer chamber 35 rise, causing the cup body 34 made of a fragile member to burst or melt. . Due to the rupture or melting of the cup body 34, the large amount of heat particles described above flow into the first combustion chamber S1.

When a large amount of hot particles flow into the first combustion chamber S1, the first gas generating agent 51 accommodated in the first combustion chamber S1 is sequentially ignited and burned, thereby generating a large amount of gas in the first combustion chamber S1. occurs. The gas generated in the first combustion chamber S1 passes through the inside of the filter 70. At that time, the filter 70 removes heat and cools the gas. It flows into the discharge chamber S3.

Here, the slag generated by burning the first gas generating agent 51 has a relatively larger outer shape than the slag generated by burning the later-described second gas generating agent 52 . Therefore, even if the density of the filter 70 is not extremely high, the slag generated by the combustion of the first gas generating agent 51 will be effectively collected by the filter 70, and the slag will be collected by the filter. Passing through 70 can be sufficiently suppressed.

Next, due to the pressure increase inside the housing caused by the combustion of the first gas generating agent 51, the sealing tape 25 closing the plurality of gas ejection ports 24 is torn. As a result, the gas generated in the first combustion chamber S1 starts to be ejected toward the outside of the housing through the plurality of gas ejection ports 24 (see arrow AR1).

In the above-described first stage, the gas ejected from the plurality of gas ejection ports 24 to the outside of the disk-shaped gas generator 1A is discharged from the airbag provided adjacent to the disk-shaped gas generator 1A. It is introduced inside to inflate and deploy the airbag.

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 an increase in pressure inside the housing caused by combustion of the first gas generating agent 51. Deform to expand. As a result, the distance between the closing portion 46a of the lid member 46 assembled to the opening end of the partition member 45 on the top plate portion 21 side (that is, the closed end of the partition portion 44) and the top plate portion 21 increases. will do.

On the other hand, in the first stage, the lid member 46 is pressed against the partition member 45 due to the pressure increase in the first combustion chamber S1 caused by the combustion of the first gas generating agent 51. . Therefore, the opening of the partition member 45 on the side of the top plate portion 21 is closed by the closing portion 46a of the lid member 46, and the outer peripheral surface of the cylindrical portion 46b of the lid member 46 is positioned near the top plate portion 21 of the partition member 45. The contact portion 46c of the lid member 46 is kept in close contact with the inner peripheral surface, and further, the contact portion 46c of the lid member 46 is in close contact with the axial end portion of the partition member 45 on the top plate portion 21 side.

Accordingly, in the first stage, each of the plurality of gas passage grooves 46b1 provided in the partition portion 44 communicates with the second combustion chamber S2, but does not communicate with the first combustion chamber S1. in a state. Therefore, the first combustion chamber S1 and the second combustion chamber S2 do not communicate with each other, and the combustion of the first gas generating agent 51 affects the second gas generating agent 52, which has not yet started to burn. disappears.

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

As shown in FIG. 6, in the second stage in which the second igniter 42 operates, the ignition charge filled in the ignition portion 42b of the second igniter 42 is heated by the resistor and ignited. The ignition part 42b bursts due to the combustion of the gunpowder. As a result, the second gas generating agents 52 accommodated in the second combustion chamber S2 are sequentially ignited and start burning.

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 as a whole was already heated to a high temperature. Therefore, even if no transfer charge is provided between the ignition part 42b and the second gas generating agent 52, the combustion of the second gas generating agent 52 is started smoothly, and the second gas is generated. Combustion of the agent 52 is less likely to be interrupted.

At this time, due to the pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, pressure is applied to the lid member 46 assembled to the partition wall member 45. The pressure mainly acts on the closing portion 46a of the member 46 in the direction along the axial direction of the housing. As a result, the lid member 46 as a whole moves toward the top plate portion 21 side of the upper shell 20 while maintaining the state in which the cylindrical portion 46 b is in close contact with the partition member 45 .

Along with this movement of the lid member 46, the region R2 (see FIG. 3) provided in the cylindrical portion 46b of the lid member 46 is separated from the partition member 45 and is out of contact with the partition member 45, and the partition portion The close contact between the partition member 45 and the cover member 46 is released by the all-around contact area provided in the cover member 44 (however, the partition wall in the area R1 (see FIG. 3) provided in the cylindrical portion 46b of the cover member 46 is released. The close contact with the member 45 is maintained), and the abutment between the abutting portion 46c of the lid member 46 and the axial end portion of the partition member 45 on the top plate portion 21 side is also released.

Therefore, the outer peripheral surface of the portion of the cylindrical portion 46b near the end on the top plate portion 21 side is exposed toward the first combustion chamber S1. The end portion on the side of the plate portion 21 is also exposed so as to face the first combustion chamber S1. Therefore, in the second stage, the first combustion chamber S1 and the second combustion chamber S2 are in communication with each other through the plurality of gas passage grooves 46b1.

As a result, gas generated in the second combustion chamber S2 passes through the plurality of gas passage grooves 46b1 and is introduced into the first combustion chamber S1. More specifically, the gas generated in the second combustion chamber S2 passes through a plurality of gas passage grooves 46b1 provided on the outer peripheral surface of the tubular portion 46b of the lid member 46, as indicated by arrows AR2 in the drawing. It enters the plurality of gas passage grooves 46b1 from the end on the bottom plate portion 11 side, and after passing through each of the plurality of gas passage grooves 46b1, as indicated by an arrow AR3 in the figure. , is discharged from the top plate 21 side end of each of the plurality of gas passage grooves 46b1 to the outside of the plurality of gas passage grooves 46b1, and is thereby introduced into the first combustion chamber S1.

In this embodiment, the movement of the lid member 46 is restricted by the top plate portion 21 when the movement of the lid member 46 in the second stage occurs by a predetermined amount. . More specifically, the lid member 46 stops when the lid member 46 comes into contact with the top plate portion 21 via the upper support member 62 . Therefore, the lid member 46 is not separated from the partition member 45 by this.

At this time, the ends of the plurality of gas passage grooves 46b1 exposed so as to face the first combustion chamber S1 and facing the top plate portion 21 are positioned so as to face the upper support member 62, respectively. Therefore, the gas released from the end portion of the portion located closer to the filter 70 in particular is sprayed onto the upper support member 62 to change its direction of movement, and the direction of movement of the gas is changed, so that it is mainly used for the lower shell. It will blow out toward the bottom plate portion 11 side of 10 .

Therefore, in the disk-shaped 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 no longer be sprayed. Therefore, breakage of the filter 70 can be prevented.

The gas generated in the second combustion chamber S2 and then introduced into the first combustion chamber S1 passes through the inside of the filter 70. At this time, the filter 70 removes heat and cools the gas. The contained slag is removed by the filter 70 and flows into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24 (see arrow AR1).

In the above-described second stage, the gas ejected from the plurality of gas ejection ports 24 to the outside of the disk-shaped gas generator 1A is discharged from the disk-shaped gas generator as in the case of the above-described first stage. It is introduced into the interior of the airbag provided adjacent to 1A to inflate and deploy the airbag.

Here, the slag generated by burning the second gas generating agent 52 is in the form of fine particles having a relatively smaller outer shape than the slag generated by burning the first gas generating agent 51. . However, the slag generated in the second combustion chamber S2 is collected and adheres to each other when passing through each of the plurality of gas passage grooves 46b1 having a sufficiently small flow passage cross-sectional area. As a result, slag with a larger outer shape is discharged from each of the plurality of gas passage grooves 46b1.

Therefore, the slag discharged with a larger outer shape is effectively collected by the filter 70 when passing through the filter 70, and the slag generated in the second combustion chamber S2 is It is possible to sufficiently suppress passing through the

Such an effect is obtained when the length of the gas passage defined by each of the plurality of gas passage grooves 46b1 is sufficiently large when the second gas generating agent 52 is burned. be. That is, in the case where the passage connecting the first combustion chamber S1 and the second combustion chamber S2 is constituted by a conventional gas passage hole (that is, a simple through hole), the length of the passage is inevitably required. , and the above-mentioned effect is hardly obtained. On the other hand, by constructing the flow path with a plurality of gas passage grooves 46b1 as in the present embodiment, it is possible to ensure a sufficiently large length, and the above-described effects can be obtained.

In addition, when the slag generated by the combustion of the second gas generating agent 52 passes through each of the plurality of gas passage grooves 46b1, the wall surface of the lid member 46 defining the gas passage grooves 46b1 and the portion facing the same It is also collected by adhering to the wall surface of the partition member 45 . Therefore, in a state in which the cover member 46 is stopped by contacting the top plate portion 21 via the upper support member 62, the length of the gas passage defined by each of the plurality of gas passage grooves 46b1 is sufficiently large. In this sense as well, the slag trapping effect can be greatly enhanced.

Note that the length of the flow passage when the lid member 46 is stopped (that is, the length of the gas passage groove 46b1 in the portion connecting the first combustion chamber S1 and the second combustion chamber S2) Since it is mainly determined by the axial length of the shaped portion 46b, the shape and layout of the gas passage groove 46b1 provided in the cylindrical portion 46b, the movement margin of the lid member 46, etc., these factors must be designed in order to obtain the above effect. It may be appropriately set in stages.

Here, in the movement margin of the lid member 46, there is a gap between the top plate portion 21 and the closing portion 46a of the lid member 46 due to the deformation of the bottom plate portion 11 and the top plate portion 21 during operation of the disk-type gas generator 1A. Since the increased distance is included, even if the closing portion 46a is positioned apart from the upper support member 62 attached to the top plate portion 21 in the state before the operation of the disk-type gas generator 1A. Alternatively, it may be in contact with the upper support member 62 .

As described above, by using the disc-type gas generator 1A according to the present embodiment, even if the density of the filter 70 is not extremely high, the second gas generating agent 52 is combusted to generate Fine particulate slag can be effectively collected inside the disk-shaped gas generator 1A. Therefore, it is possible to suppress the slag from being introduced into the airbag, and as a result, the dual-structure disk-shaped gas generator 1A can improve the slag collection function while suppressing an increase in the weight of the filter. becomes possible.

Here, in order to ensure sustained combustion of the second gas generating agent 52, it is necessary to sufficiently increase the internal pressure of the second combustion chamber S2 in the above-described second stage. The sum of the flow passage cross-sectional areas of the plurality of gas passage grooves 46b1 connecting the first combustion chamber S1 and the second combustion chamber S2 may be reduced sufficiently. In this respect, in the disk-shaped gas generator 1A according to the present embodiment, as long as the cover member 46 does not completely separate from the partition member 45, regardless of the amount of movement of the cover member 46, the flow passage cross-sectional area The summation remains constant. Therefore, by adopting the above configuration, the second gas generating agent 52 can be burned reliably and continuously.

Further, by appropriately adjusting the axial length of the cylindrical portion 46b of the lid member 46 while adopting the above-described configuration, it is possible to control the length of the combustion time of the second gas generating agent 52 as a whole. A secondary effect can be obtained. By changing the axial length of the cylindrical portion 46b of the lid member 46, the positions of the ends of the plurality of gas passage grooves 46b1 on the side of the bottom plate portion 11 can be varied with respect to the second combustion chamber S2. By being able to change.

That is, when the axial length of the cylindrical portion 46b is shortened, the plurality of gas passage grooves 46b1 described above serve as discharge portions for the gas generated in the second combustion chamber S2 from the second combustion chamber S2. are arranged at positions closer to the top plate portion 21 side than the second combustion chamber S2. Therefore, in this case, the portion of the second gas generating agent 52 that is ignited earlier by the second igniter 42 (that is, the portion of the second combustion chamber S2 that is closer to the bottom plate portion 11 side) The gas generated by the combustion of the second gas generating agent 52) passes through the space closer to the top plate portion 21 side of the second combustion chamber S2, accompanied by hot particles generated by the combustion, to the discharge portion. It will come. As a result, the spread of flame toward the top plate portion 21 in the initial stage of combustion of the second gas generating agent 52 is promoted, and as a result, the combustion time of the second gas generating agent 52 as a whole can be shortened. can.

On the other hand, when the axial length of the cylindrical portion 46b is increased, the plurality of gas passage grooves 46b1 described above serve as discharge portions for the gas generated in the second combustion chamber S2 from the second combustion chamber S2. is arranged at a position closer to the bottom plate portion 11 side of the second combustion chamber S2. Therefore, in this case, the portion of the second gas generating agent 52 that is ignited earlier by the second igniter 42 (that is, the portion of the second combustion chamber S2 that is closer to the bottom plate portion 11 side) The gas generated by the combustion of the second gas generating agent 52) passes through the space (that is, the space surrounded by the cylindrical portion 46b) closer to the top plate portion 21 side of the second combustion chamber S2. It will reach the discharge part without any trouble. As a result, the spread of flame toward the top plate portion 21 in the initial stage of combustion of the second gas generating agent 52 is suppressed, and as a result, the combustion time of the second gas generating agent 52 as a whole can be lengthened. can.

Therefore, by appropriately setting the axial length of the cylindrical portion 46b of the lid member 46 while adopting the above-described configuration, the length of the combustion time of the second gas generating agent 52 as a whole can be controlled. A desired gas output is obtained as Therefore, the disc-type gas generator 1A can obtain the optimum gas output according to the specifications of the airbag device to be mounted.

By adopting the configuration described above, the gas generated in the second combustion chamber S2 collides with the upper support member 62 when it is ejected into the first combustion chamber S1 through the plurality of gas passage grooves 46b1. As a result, the traveling direction of the gas is changed, and a further secondary effect is obtained in that the slag contained in the gas is effectively captured by the inner wall surface of the upper support member 62 at the time of this collision. can also

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

In the present embodiment, the cover member 46 is provided with the stop portion 46c, but the stop portion 46c is not an essential component. good.

Further, in the present embodiment, the explanation has been given by exemplifying the case where the above-described region R2 is provided in the cylindrical portion 46b of the lid member 46 so that the partition portion 44 is provided with the all-around contact region. However, the all-around close contact area is not essential. For example, when the lid member 46 is provided with the abutting portion 46c, the all-around close contact area may not be provided.

Furthermore, in the present embodiment, the cover member 46 is provided with a plurality of gas passage grooves 46b1. This may be provided only in the singular.

FIG. 7 is a partially broken side view of a lid member according to a modification of the disk-shaped gas generator according to the present embodiment. Although the lid member 46 described above is made of a forged and cut product, it can be replaced with a lid member 46' made of a press-formed product as shown in FIG.

As shown in FIG. 7, the lid member 46' made of a press-formed product is formed by pressing a plate-like member made of metal. It can be manufactured lightweight and inexpensively. In this case, too, the lid member 46' is provided with the above-described closing portion 46a, cylindrical portion 46b, and abutting portion 46c, and the cylindrical portion 46b is provided with a plurality of gas passage grooves 46b1 on its outer peripheral surface. , it becomes possible to obtain the effects described above.

(Embodiment 2)
FIG. 8 is a schematic diagram of a disk-type gas generator according to Embodiment 2. FIG. A disk-shaped gas generator 1B according to the present embodiment will be described below with reference to FIG. The disk-shaped gas generator 1B according to the present embodiment differs from the disk-shaped gas generator 1A according to the first embodiment described above in the configuration of the partition section 44 .

As shown in FIG. 8, in the disk-shaped gas generator 1B, the cylindrical portion 46b of the lid member 46 is not provided with the above-described region R2 (see FIG. 3), and the entire cylindrical portion 46b It is composed of a region R1 (see FIG. 3). That is, between the partition member 45 and the cylindrical portion 46b of the lid member 46, there is not formed an all-around contact area where the partition member 45 and the cylindrical portion 46b are in close contact with each other over the entire circumferential direction.

On the other hand, the cover member 46 of the disk-type gas generator 1B has an annular projecting portion 46d extending from the peripheral edge of the abutment portion 46c toward the bottom plate portion 11 side of the lower shell 10. As shown in FIG. The annular projecting portion 46d is press-fitted by being externally inserted into the opening end of the partition member 45 on the top plate portion 21 side. It adheres to the outer peripheral surface of the side edge. That is, at the position where the annular protruding portion 46d is provided, the partition portion 44 is formed with an all-around contact area where the partition member 45 and the cylindrical portion 46b are in close contact with each other over the entire circumferential direction.

Even when configured in this way, the same effects as those described in the first embodiment can be obtained, and the dual filter can improve the slag collection function while suppressing an increase in the weight of the filter. It can be a disk-type gas generator 1B with a structure. In addition, as described above, the partition member 45 and the lid member 46 are in close contact with each other over the entire circumferential direction at a predetermined position of the partition portion 44 . During non-operation, the non-communication state between the first combustion chamber S1 and the second combustion chamber S2 can be more reliably maintained.

(Embodiment 3)
FIG. 9 is a schematic diagram of a disk-shaped gas generator according to Embodiment 3, and FIG. 10 is a schematic diagram showing the second stage of operation of the disk-shaped gas generator. The configuration and operation of the disk-shaped gas generator 1C according to the present embodiment will be described below with reference to FIGS. 9 and 10. FIG. The disk-shaped gas generator 1C according to the present embodiment differs from the disk-shaped gas generator 1A according to the first embodiment described above in the configuration of the partition section 44 .

As shown in FIG. 9, in the disk-shaped gas generator 1C, the cover member 46 has a bottomed tubular shape with an open end on the bottom plate portion 11 side of the lower shell 10, and the partition member 45 is attached to the open end on the top plate portion 21 side. The lid member 46 includes a disk-shaped closing portion 46a that constitutes the closed end of the partition portion 44 by covering the opening of the partition member 45 located on the top plate portion 21 side, and the bottom plate portion 11 side from the peripheral edge of the closing portion 46a. and a cylindrical tubular portion 46 b that covers the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 by extending toward the top plate portion 21 . A stopper portion 46c is provided on the peripheral edge of the closing portion 46a of the lid member 46 so as to contact the axial end portion of the partition member 45 on the top plate portion 21 side.

The lid member 46 is attached to the partition member 45 by being fitted over the above-described open end of the partition member 45, and preferably fixed to the partition member 45 by press fitting. As a result, the inner peripheral surface of the cylindrical portion 46b of the lid member 46 is in close contact with the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 .

A plurality of gas passage grooves 46b1 are provided on the inner peripheral surface of the cylindrical portion 46b, which is in close contact with the partition member 45. As shown in FIG. The plurality of gas passage grooves 46b1 are positioned apart from each other in the circumferential direction of the cylindrical portion 46b, and all extend along the axial direction of the cylindrical portion 46b. One end of each of the plurality of gas passage grooves 46b1 reaches the bottom plate portion 11 side end of the tubular portion 46b, and the other end of each of the plurality of gas passage grooves 46b1 reaches the top plate portion of the tubular portion 46b. It is positioned near the end on the 21 side.

Here, the tubular portion 46b of the lid member 46 is divided into two regions R1 and R2 (see FIG. 3) in the axial direction of the tubular portion 46b, as in the first embodiment described above. A region R1 in which the gas passage groove 46b1 is provided at any position in the circumferential direction of the cylindrical portion 46b, and a region R2 in which the gas passage groove 46b1 is not provided at any position in the circumferential direction of the cylindrical portion 46b. contains. The region R1 is positioned closer to the end of the tubular portion 46b on the bottom plate portion 11 side, and the region R2 is positioned closer to the end of the tubular portion 46b on the top plate portion 21 side.

In the disk-type gas generator 1C configured in this way, as in the case of the disk-type gas generator 1A according to Embodiment 1 described above, during its operation, the first gas generating agent 51 is combusted. A first stage and a second stage in which mainly the second gas generating agent 52 is burned.

In the first stage, the transfer charge 36 is ignited and burned by the operation of the first igniter 32, thereby sequentially igniting and burning the first gas generating agent 51 in the first combustion chamber S1. A large amount of gas is generated, and the gas generated in the first combustion chamber S1 passes through the inside of the filter 70 and is introduced into the gas discharge chamber S3, and then through the plurality of gas ejection ports 24 and out of the housing. It is ejected toward the outside.

In this first stage, the cover member 46 is pressed against the partition member 45 due to the pressure increase in the first combustion chamber S1 caused by the combustion of the first gas generating agent 51 . Therefore, the opening of the partition member 45 on the top plate portion 21 side is closed by the closing portion 46 a of the lid member 46 , and the inner peripheral surface of the cylindrical portion 46 b of the lid member 46 is close to the top plate portion 21 of the partition member 45 . Further, the abutment portion 46c of the lid member 46 is brought into a state of being in close contact with the axial end portion of the partition member 45 on the top plate portion 21 side.

Accordingly, in the first stage, each of the plurality of gas passage grooves 46b1 provided in the partition portion 44 communicates with the first combustion chamber S1, but does not communicate with the second combustion chamber S2. in a state. Therefore, the first combustion chamber S1 and the second combustion chamber S2 do not communicate with each other, and the combustion of the first gas generating agent 51 affects the second gas generating agent 52, which has not yet started to burn. disappears.

As shown in FIG. 10, in the second stage, the second igniter 42 operates to sequentially ignite and burn the second gas generating agent 52, thereby generating a large amount of gas in the second combustion chamber S2. Occur. At this time, due to the pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, pressure is applied to the lid member 46 assembled to the partition wall member 45. The pressure mainly acts on the closing portion 46a of the member 46 in the direction along the axial direction of the housing. As a result, the lid member 46 as a whole moves toward the top plate portion 21 side of the upper shell 20 while maintaining the state in which the cylindrical portion 46 b is in close contact with the partition member 45 .

As the lid member 46 moves, the region R2 provided in the cylindrical portion 46b of the lid member 46 is separated from the partition member 45 and is out of contact with the partition member 45. The close contact between the partition member 45 and the lid member 46 due to the full-peripheral close contact region is released (however, the close contact between the partition member 45 and the region R1 provided in the cylindrical portion 46b of the lid member 46 is maintained). , the abutment between the abutting portion 46c of the lid member 46 and the axial end portion of the partition member 45 on the top plate portion 21 side is also released.

Therefore, the inner peripheral surface of the portion of the cylindrical portion 46b near the end on the top plate portion 21 side is exposed toward the second combustion chamber S2. The end portion on the top plate portion 21 side is also exposed so as to face the second combustion chamber S2. Therefore, in the second stage, the first combustion chamber S1 and the second combustion chamber S2 are in communication with each other through the plurality of gas passage grooves 46b1.

As a result, gas generated in the second combustion chamber S2 passes through the plurality of gas passage grooves 46b1 and is introduced into the first combustion chamber S1. More specifically, gas generated in the second combustion chamber S2 passes through a plurality of gas passage grooves 46b1 provided on the inner peripheral surface of the cylindrical portion 46b of the lid member 46, as indicated by arrows AR2 in the drawing. enters into the plurality of gas passage grooves 46b1 from the end on the top plate portion 21 side, and after passing through each of the plurality of gas passage grooves 46b1, indicated by arrow AR3 in the figure , from the bottom plate portion 11 side end of each of the plurality of gas passage grooves 46b1 to the outside of the plurality of gas passage grooves 46b1, thereby being introduced into the first combustion chamber S1.

The gas generated in the second combustion chamber S2 and then introduced into the first combustion chamber S1 passes through the inside of the filter 70. At this time, the filter 70 removes heat and cools the gas. The contained slag is removed by the filter 70 and flows into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24 (see arrow AR1).

Therefore, even with such a configuration, the slag generated in the second combustion chamber S2 flows into the first combustion chamber S1 via the plurality of gas passage grooves 46b1 having a sufficiently small flow passage cross-sectional area. will be introduced. Therefore, as in the case of the first embodiment described above, even if the density of the filter 70 is not extremely high, the fine particulate slag generated by the combustion of the second gas generating agent 52 can be removed from the disk-shaped slag. It becomes possible to effectively collect inside the gas generator 1C.

As described above, by using the disk-type gas generator 1C according to the present embodiment, it is possible to prevent slag from being introduced into the airbag. It is possible to provide a dual-structure disk-shaped gas generator 1C capable of enhancing the collection function.

In the present embodiment, the above-described region R2 is provided in the cylindrical portion 46b of the lid member 46, thereby providing the partition portion 44 with the all-around contact region. However, the all-around contact area of this configuration is not an essential configuration, and may be omitted.

Further, in the present embodiment, the cover member 46 is provided with a plurality of gas passage grooves 46b1. may be provided only in the singular.

(Embodiment 4)
FIG. 11 is a schematic diagram of a disk-type gas generator according to Embodiment 4. FIG. A disk-shaped gas generator 1D according to this embodiment will be described below with reference to FIG. The disk-shaped gas generator 1D according to the present embodiment differs from the disk-shaped gas generator 1C according to the third embodiment described above in the configuration of the partition section 44. FIG.

As shown in FIG. 11, in the disk-shaped gas generator 1D, the cylindrical portion 46b of the lid member 46 is not provided with the above-described region R2, and the entire cylindrical portion 46b is composed of the above-described region R1. It is That is, between the partition member 45 and the cylindrical portion 46b of the lid member 46, there is not formed an all-around contact area where the partition member 45 and the cylindrical portion 46b are in close contact with each other over the entire circumferential direction.

On the other hand, the lid member 46 of the disk-type gas generator 1D has an annular projecting portion 46d extending from the peripheral edge of the closing portion 46a toward the bottom plate portion 11 side of the lower shell 10. As shown in FIG. The annular projecting portion 46d is press-fitted by being inserted into the opening end of the partition member 45 on the top plate portion 21 side. It is in close contact with the inner peripheral surface of the end of the That is, at the position where the annular protruding portion 46d is provided, the partition portion 44 is formed with an all-around contact area where the partition member 45 and the cylindrical portion 46b are in close contact with each other over the entire circumferential direction.

Even when configured in this way, the same effects as those described in the above-described third embodiment can be obtained, and the dual filter can improve the slag collection function while suppressing an increase in the weight of the filter. It can be a disc-type gas generator 1D with a structure. In addition, as described above, the partition member 45 and the lid member 46 are in close contact with each other over the entire circumferential direction at a predetermined position of the partition portion 44 . During non-operation, the non-communication state between the first combustion chamber S1 and the second combustion chamber S2 can be more reliably maintained.

(Embodiment 5)
FIG. 12 is a schematic diagram of a disk-type gas generator according to Embodiment 5, and FIG. 13 is an exploded perspective view showing an assembly structure of the partition shown in FIG. FIG. 14 is a schematic diagram showing the second stage of operation of the disk-shaped gas generator. A disk-shaped gas generator 1E according to the present embodiment will be described below with reference to FIGS. 12 to 14. FIG. The disc-shaped gas generator 1E according to the present embodiment differs from the disc-shaped gas generator 1A according to the first embodiment described above in the configuration of the partition section 44 .

As shown in FIGS. 12 and 13, in the disk-type gas generator 1E, the partition portion 44 has a partition member 45 and a lid member 46, and the partition member 45 and the lid member 46 are combined. The overall shape is cup-shaped.

The partition member 45 has a tubular shape with openings at both ends in the axial direction. The partition member 45 is arranged so that its axial direction is parallel to the axial direction of the housing, and the open end located on the bottom plate portion 11 side of the lower shell 10 is located at the bottom plate portion 11 assembled to the bottom plate portion 11 . It functions as a fixing portion 45 a fixed to the 2 holder 41 .

A plurality of gas passage grooves 45b are provided on the outer peripheral surface of the portion of the partition member 45 near the end on the top plate portion 21 side. The plurality of gas passage grooves 45 b are positioned apart from each other in the circumferential direction of the partition member 45 and all extend along the axial direction of the partition member 45 . One end of each of the plurality of gas passage grooves 45b reaches the end of the partition wall member 45 on the top plate portion 21 side, and the other end of each of the plurality of gas passage grooves 45b reaches the partition wall without reaching the fixed portion 45a. The member 45 is interrupted at a midway position in the axial direction.

The cover member 46 has a bottomed tubular shape with an open end on the bottom plate portion 11 side, and is attached to the open end of the partition member 45 on the top plate portion 21 side. The lid member 46 includes a disk-shaped closing portion 46a that constitutes the closed end of the partition portion 44 by covering the opening of the partition member 45 located on the top plate portion 21 side, and the bottom plate portion 11 side from the peripheral edge of the closing portion 46a. and a cylindrical tubular portion 46 b that covers the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 by extending toward the top plate portion 21 . A stopper portion 46c is provided on the peripheral edge of the closing portion 46a of the lid member 46 so as to contact the axial end portion of the partition member 45 on the top plate portion 21 side.

The lid member 46 is attached to the partition member 45 by being fitted over the above-described open end of the partition member 45, and preferably fixed to the partition member 45 by press fitting. As a result, the inner peripheral surface of the cylindrical portion 46b of the lid member 46 is in close contact with the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 .

Here, the tubular portion 46b of the lid member 46 covers the outer peripheral surface of the partition wall member 45 near the end on the top plate portion 21 side provided with the plurality of gas passage grooves 45b. , the tubular portion 46b extends to reach further below the end of each of the plurality of gas passage grooves 45b on the side of the bottom plate portion 11 (that is, the portion near the bottom plate portion 11).

As a result, between the cylindrical portion 46b of the lid member 46 and the partition member 45, the gas passage groove 45b is provided at any position in the circumferential direction of the partition member 45 (that is, in the first embodiment). region corresponding to the region R1 in the first embodiment) and a region in which the gas passage groove 45b is not provided at any position in the circumferential direction of the partition member 45 (that is, a region corresponding to the region R2 in the first embodiment) The former region is located near the end of the cylindrical portion 46b on the top plate portion 21 side, and the latter region is located near the end of the cylindrical portion 46b on the bottom plate portion 11 side. will do. The latter area forms an all-around contact area where the partition member 45 and the lid member 46 are in close contact with each other over the entire circumference of the partition portion 44 in the circumferential direction.

In the disk-shaped gas generator 1E configured in this way, as in the case of the disk-shaped gas generator 1A according to Embodiment 1 described above, during the operation, the first gas generating agent 51 is combusted. A first stage and a second stage in which mainly the second gas generating agent 52 is burned.

In the first stage, the transfer charge 36 is ignited and burned by the operation of the first igniter 32, thereby sequentially igniting and burning the first gas generating agent 51 in the first combustion chamber S1. A large amount of gas is generated, and the gas generated in the first combustion chamber S1 passes through the inside of the filter 70 and is introduced into the gas discharge chamber S3, and then through the plurality of gas ejection ports 24 and out of the housing. It is ejected toward the outside.

In this first stage, the cover member 46 is pressed against the partition member 45 due to the pressure increase in the first combustion chamber S1 caused by the combustion of the first gas generating agent 51 . Therefore, the opening of the partition member 45 on the top plate portion 21 side is closed by the closing portion 46 a of the lid member 46 , and the inner peripheral surface of the cylindrical portion 46 b of the lid member 46 is close to the top plate portion 21 of the partition member 45 . Further, the abutment portion 46c of the lid member 46 is brought into a state of being in close contact with the axial end portion of the partition member 45 on the top plate portion 21 side.

Accordingly, in the first stage, each of the plurality of gas passage grooves 45b provided in the partition portion 44 is in a state of communicating with neither the first combustion chamber S1 nor the second combustion chamber S2. Therefore, the first combustion chamber S1 and the second combustion chamber S2 do not communicate with each other, and the combustion of the first gas generating agent 51 affects the second gas generating agent 52, which has not yet started to burn. disappears.

As shown in FIG. 14, in the second stage, the second igniter 42 operates to sequentially ignite and burn the second gas generating agents 52, thereby generating a large amount of gas in the second combustion chamber S2. Occur. At this time, due to the pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, pressure is applied to the lid member 46 assembled to the partition wall member 45. The pressure mainly acts on the closing portion 46a of the member 46 in the direction along the axial direction of the housing. As a result, the lid member 46 as a whole moves toward the top plate portion 21 side of the upper shell 20 while maintaining the state in which the cylindrical portion 46 b is in close contact with the partition member 45 .

With this movement of the lid member 46, the latter region (that is, the portion forming the all-around contact region) provided in the partition member 45 is exposed, and the whole circumference provided in the partition portion 44 is exposed. The close contact between the partition member 45 and the lid member 46 by the close contact area is released (however, the close contact of the former area provided on the partition member 45 with the cylindrical portion 46b is maintained), and the cover member 46 is The abutment between the abutting portion 46c and the axial end portion of the partition member 45 on the top plate portion 21 side is also released.

Therefore, the ends of the plurality of gas passage grooves 45b provided on the outer peripheral surface of the partition member 45 on the side of the bottom plate portion 11 are exposed so as to face the first combustion chamber S1, and the plurality of gas passage grooves 45b are exposed to face the first combustion chamber S1. are exposed so as to face the second combustion chamber S2. Therefore, in the second stage, the first combustion chamber S1 and the second combustion chamber S2 are in communication with each other through the plurality of gas passage grooves 45b.

As a result, the gas generated in the second combustion chamber S2 passes through the plurality of gas passage grooves 45b and is introduced into the first combustion chamber S1. More specifically, the gas generated in the second combustion chamber S2 passes through the top plate portion of each of the plurality of gas passage grooves 45b provided on the outer peripheral surface of the partition member 45, as indicated by arrows AR2 in the drawing. 21 side of the gas passage grooves 45b, and after passing through each of the plurality of gas passage grooves 45b, as indicated by arrows AR3 in FIG. The gas is discharged to the outside of the plurality of gas passage grooves 45b from the ends of the passage grooves 45b on the side of the bottom plate portion 11, thereby being introduced into the first combustion chamber S1.

The gas generated in the second combustion chamber S2 and then introduced into the first combustion chamber S1 passes through the inside of the filter 70. At this time, the filter 70 removes heat and cools the gas. The contained slag is removed by the filter 70 and flows into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24 (see arrow AR1).

Therefore, even with such a configuration, the slag generated in the second combustion chamber S2 flows into the first combustion chamber S1 through the plurality of gas passage grooves 45b having a sufficiently small flow passage cross-sectional area. will be introduced. Therefore, as in the case of the first embodiment described above, even if the density of the filter 70 is not extremely high, the fine particulate slag generated by the combustion of the second gas generating agent 52 can be removed from the disk-shaped slag. It becomes possible to effectively collect inside the gas generator 1E.

Thus, by using the disk-type gas generator 1E according to the present embodiment, it is possible to suppress the slag from being introduced into the airbag. It is possible to provide a dual-structure disk-type gas generator 1E capable of enhancing the collection function.

In the present embodiment, the cylindrical portion of the lid member 46 reaches below the bottom plate portion 11 side end of each of the plurality of gas passage grooves 45b (that is, the portion near the bottom plate portion 11). 46b is extended to provide the partition portion 44 with an all-around close contact region. If the member 46 is provided with the stop portion 46c, it may be omitted.

In addition, in the present embodiment, the case where the plurality of gas passage grooves 45b are provided in the partition member 45 has been described as an example. may be provided only in the singular.

(Embodiment 6)
FIG. 15 is a schematic diagram of a disk-type gas generator according to Embodiment 6. FIG. A disk-shaped gas generator 1F according to the present embodiment will be described below with reference to FIG. The disk-shaped gas generator 1F according to the present embodiment differs from the disk-shaped gas generator 1E according to the fifth embodiment described above in the configuration of the partition section 44 .

As shown in FIG. 15, in the disk-shaped gas generator 1F, the partition member 45 and the tubular portion 46b of the cover member 46 are in close contact with each other over the entire circumferential direction. A full-circumference contact region is not formed. That is, the ends of the plurality of gas passage grooves 45b provided on the outer peripheral surface of the partition member 45, which are located on the side of the bottom plate portion 11, are exposed so as to face the first combustion chamber S1.

On the other hand, the lid member 46 of the disk-type gas generator 1F has an annular projecting portion 46d extending from the peripheral edge of the closing portion 46a toward the bottom plate portion 11 side of the lower shell 10. As shown in FIG. The annular projecting portion 46d is press-fitted by being inserted into the opening end of the partition member 45 on the top plate portion 21 side. It is in close contact with the inner peripheral surface of the end of the That is, at the position where the annular protruding portion 46d is provided, the partition portion 44 is formed with an all-around contact area where the partition member 45 and the cylindrical portion 46b are in close contact with each other over the entire circumferential direction.

Even when configured in this manner, the same effects as those described in the above fifth embodiment can be obtained, and the dual filter can improve the slag collection function while suppressing an increase in the weight of the filter. It can be a disk-type gas generator 1F with a structure. In addition, as described above, the partition member 45 and the lid member 46 are in close contact with each other over the entire circumferential direction at a predetermined position of the partition portion 44 . During non-operation, the non-communication state between the first combustion chamber S1 and the second combustion chamber S2 can be more reliably maintained.

(Embodiment 7)
FIG. 16 is a schematic diagram of a disk-type gas generator according to Embodiment 7, and FIG. 17 is a schematic diagram showing the second stage of operation of the disk-type gas generator. The configuration and operation of the disk-shaped gas generator 1G according to the present embodiment will be described below with reference to FIGS. 16 and 17. FIG. The disk-shaped gas generator 1G according to the present embodiment differs from the disk-shaped gas generator 1E according to the fifth embodiment described above in the configuration of the partition section 44 .

As shown in FIG. 16, in the disk-shaped gas generator 1G, the cover member 46 has a bottomed cylindrical shape with an open end on the bottom plate portion 11 side of the lower shell 10, and the partition member 45 is attached to the open end on the top plate portion 21 side. The lid member 46 includes a disk-shaped closing portion 46a that constitutes the closed end of the partition portion 44 by covering the opening of the partition member 45 located on the top plate portion 21 side, and the bottom plate portion 11 side from the peripheral edge of the closing portion 46a. and a cylindrical tubular portion 46b that covers the inner peripheral surface of the portion of the partition member 45 closer to the top plate portion 21 by extending toward. A stopper portion 46c is provided on the peripheral edge of the closing portion 46a of the lid member 46 so as to protrude radially outward and contact the axial end portion of the partition member 45 on the top plate portion 21 side. .

The lid member 46 is assembled to the partition member 45 by being inserted into the above-described open end of the partition member 45, and is preferably fixed to the partition member 45 by press fitting. As a result, the outer peripheral surface of the tubular portion 46b of the lid member 46 is in close contact with the inner peripheral surface of the portion of the partition member 45 near the top plate portion 21 .

A plurality of gas passage grooves 45b are provided on the inner peripheral surface of the portion of the partition member 45 near the end on the top plate portion 21 side. The plurality of gas passage grooves 45 b are positioned apart from each other in the circumferential direction of the partition member 45 and all extend along the axial direction of the partition member 45 . One end of each of the plurality of gas passage grooves 45b reaches the end of the partition wall member 45 on the top plate portion 21 side, and the other end of each of the plurality of gas passage grooves 45b reaches the partition wall without reaching the fixed portion 45a. The member 45 is interrupted at a midway position in the axial direction.

Here, the cylindrical portion 46b of the lid member 46 covers the inner peripheral surface of the partition wall member 45 near the end on the top plate portion 21 side provided with the plurality of gas passage grooves 45b described above. , the cylindrical portion 46b extends to reach further below the end portion of each of the plurality of gas passage grooves 45b on the side of the bottom plate portion 11 (that is, a portion close to the bottom plate portion 11).

As a result, between the cylindrical portion 46b of the lid member 46 and the partition member 45, the gas passage groove 45b is formed at any position in the circumferential direction of the partition member 45, as in the fifth embodiment described above. The area where the gas passage groove 45b is provided (that is, the area corresponding to the area R1 in the first embodiment) and the area where the gas passage groove 45b is not provided at any position in the circumferential direction of the partition member 45 (that is, the area corresponding to the area R1 in the first embodiment). 1) is included, the former region is located near the end of the cylindrical portion 46b on the top plate portion 21 side, and the latter region is the cylindrical portion It is positioned near the end of 46b on the bottom plate portion 11 side. The latter area forms an all-around contact area where the partition member 45 and the lid member 46 are in close contact with each other over the entire circumference of the partition portion 44 in the circumferential direction.

In the disk-type gas generator 1G configured in this way, as in the case of the disk-type gas generator 1E according to Embodiment 5 described above, during the operation, the first gas generating agent 51 is combusted. A first stage and a second stage in which mainly the second gas generating agent 52 is burned.

In the first stage, the transfer charge 36 is ignited and burned by the operation of the first igniter 32, thereby sequentially igniting and burning the first gas generating agent 51 in the first combustion chamber S1. A large amount of gas is generated, and the gas generated in the first combustion chamber S1 passes through the inside of the filter 70 and is introduced into the gas discharge chamber S3, and then through the plurality of gas ejection ports 24 and out of the housing. It is ejected toward the outside.

In this first stage, the cover member 46 is pressed against the partition member 45 due to the pressure increase in the first combustion chamber S1 caused by the combustion of the first gas generating agent 51 . Therefore, the opening of the partition member 45 on the side of the top plate portion 21 is closed by the closing portion 46a of the lid member 46, and the outer peripheral surface of the cylindrical portion 46b of the lid member 46 is positioned near the top plate portion 21 of the partition member 45. The contact portion 46c of the lid member 46 is kept in close contact with the inner peripheral surface, and further, the contact portion 46c of the lid member 46 is in close contact with the axial end portion of the partition member 45 on the top plate portion 21 side.

Accordingly, in the first stage, each of the plurality of gas passage grooves 45b provided in the partition portion 44 is in a state of communicating with neither the first combustion chamber S1 nor the second combustion chamber S2. Therefore, the first combustion chamber S1 and the second combustion chamber S2 do not communicate with each other, and the combustion of the first gas generating agent 51 affects the second gas generating agent 52, which has not yet started to burn. disappears.

As shown in FIG. 17, in the second stage, the second igniter 42 operates to sequentially ignite and burn the second gas generating agent 52, thereby generating a large amount of gas in the second combustion chamber S2. Occur. At this time, due to the pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, pressure is applied to the lid member 46 assembled to the partition wall member 45. The pressure mainly acts on the closing portion 46a of the member 46 in the direction along the axial direction of the housing. As a result, the lid member 46 as a whole moves toward the top plate portion 21 side of the upper shell 20 while maintaining the state in which the cylindrical portion 46 b is in close contact with the partition member 45 .

With this movement of the lid member 46, the latter region (that is, the portion forming the all-around contact region) provided in the partition member 45 is exposed, and the whole circumference provided in the partition portion 44 is exposed. The close contact between the partition member 45 and the lid member 46 by the close contact area is released (however, the close contact of the former area provided on the partition member 45 with the cylindrical portion 46b is maintained), and the cover member 46 is The abutment between the abutting portion 46c and the axial end portion of the partition member 45 on the top plate portion 21 side is also released.

Therefore, the ends of the plurality of gas passage grooves 45b provided on the inner peripheral surface of the partition member 45 on the side of the top plate portion 21 are exposed so as to face the first combustion chamber S1, and the plurality of gas passage grooves 45b are exposed so as to face the first combustion chamber S1. The ends of the grooves 45b on the side of the bottom plate portion 11 are exposed so as to face the second combustion chamber S2. Therefore, in the second stage, the first combustion chamber S1 and the second combustion chamber S2 are in communication with each other through the plurality of gas passage grooves 45b.

As a result, the gas generated in the second combustion chamber S2 passes through the plurality of gas passage grooves 45b and is introduced into the first combustion chamber S1. More specifically, the gas generated in the second combustion chamber S2 passes through the bottom plate portion of each of the plurality of gas passage grooves 45b provided on the inner peripheral surface of the partition member 45, as indicated by arrows AR2 in the drawing. After entering the plurality of gas passage grooves 45b from the end on the 11 side and passing through each of the plurality of gas passage grooves 45b, as indicated by arrows AR3 in the figure, a plurality of gas The gas is discharged outside the plurality of gas passage grooves 45b from the ends of the passage grooves 45b on the side of the top plate portion 21, thereby being introduced into the first combustion chamber S1.

The gas generated in the second combustion chamber S2 and then introduced into the first combustion chamber S1 passes through the inside of the filter 70. At this time, the filter 70 removes heat and cools the gas. The contained slag is removed by the filter 70 and flows into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24 (see arrow AR1).

Therefore, even with such a configuration, the slag generated in the second combustion chamber S2 flows into the first combustion chamber S1 through the plurality of gas passage grooves 45b having a sufficiently small flow passage cross-sectional area. will be introduced. Therefore, as in the case of the fifth embodiment described above, even if the density of the filter 70 is not extremely high, the fine particulate slag generated by the combustion of the second gas generating agent 52 can be removed from the disk-shaped slag. It becomes possible to effectively collect inside the gas generator 1G.

Thus, by using the disk-type gas generator 1G according to the present embodiment, it is possible to prevent the slag from being introduced into the airbag. A dual-structure disk-shaped gas generator 1G capable of enhancing the collection function can be provided.

By appropriately adjusting the axial length of the cylindrical portion 46b of the lid member 46 while adopting the above-described configuration, the second gas generating agent 52 as a whole can be It is also possible to control the length of the burning time. Therefore, the disk-type gas generator 1G can be configured to obtain an optimum gas output according to the specifications of the airbag device to be mounted.

In the present embodiment, the cover member 46 is provided with the stop portion 46c, but the stop portion 46c is not an essential component. good.

Further, in the present embodiment, the cylindrical portion of the lid member 46 reaches further below (that is, a portion close to the bottom plate portion 11) the end portion of each of the plurality of gas passage grooves 45b on the side of the bottom plate portion 11. 46b is extended to provide the partition portion 44 with an all-around close contact region. If the member 46 is provided with the stop portion 46c, it may be omitted.

Furthermore, in the present embodiment, the partition member 45 is provided with a plurality of gas passage grooves 45b. This may be provided only in the singular.

(Embodiment 8)
18 is a schematic diagram of a disk-shaped gas generator according to Embodiment 8. FIG. A disk-shaped gas generator 1H according to the present embodiment will be described below with reference to FIG. The disk-shaped gas generator 1H according to the present embodiment differs from the disk-shaped gas generator 1G according to the seventh embodiment described above in the configuration of the partition section 44. FIG.

As shown in FIG. 18, in the disk-shaped gas generator 1H, the partition member 45 and the tubular portion 46b of the cover member 46 are in close contact with each other over the entire circumferential direction. A full-circumference contact region is not formed. That is, the ends of the plurality of gas passage grooves 45b provided in the inner peripheral surface of the partition member 45, which are located on the side of the bottom plate portion 11, are exposed so as to face the second combustion chamber S2.

On the other hand, the cover member 46 of the disk-shaped gas generator 1H has an annular projecting portion 46d extending from the peripheral edge of the abutting portion 46c toward the bottom plate portion 11 side of the lower shell 10. As shown in FIG. The annular projecting portion 46d is press-fitted by being externally inserted into the opening end of the partition member 45 on the top plate portion 21 side. It adheres to the outer peripheral surface of the side edge. That is, at the position where the annular protruding portion 46d is provided, the partition portion 44 is formed with an all-around contact area where the partition member 45 and the cylindrical portion 46b are in close contact with each other over the entire circumferential direction.

Even when configured in this way, the same effects as those described in the above-described seventh embodiment can be obtained, and the dual filter can improve the slag collection function while suppressing an increase in the weight of the filter. It can be a disc-type gas generator 1H with a structure. In addition, as described above, the partition member 45 and the lid member 46 are in close contact with each other over the entire circumferential direction at a predetermined position of the partition portion 44 . During non-operation, the non-communication state between the first combustion chamber S1 and the second combustion chamber S2 can be more reliably maintained.

(Other forms, etc.)
In the first and seventh embodiments and the like of the present invention described above, in the second stage in which the second igniter is activated and after the movement of the lid member is restricted by the top plate portion, a plurality of gas passages The explanation has been given by exemplifying the case where the end of the groove on the side of the top plate portion is positioned so as to face the upper support member. Alternatively, the ends of the plurality of gas passage grooves on the side of the top plate portion may not face the upper support member.

Further, in the first to eighth embodiments of the present invention described above, the first igniter and the second igniter are energized at different timings, so that the second igniter is delayed from the operation timing of the first igniter. Although the case where they are configured to operate at the same timing has been described as an example, they may be configured to operate at the same timing by energizing them at the same timing. Further, even when the first igniter and the second igniter are energized at the same timing, by providing a delay charge for delaying the ignition of the ignition charge in the ignition part of the second igniter, the second igniter The time required from the energization of the igniter to the ignition of the ignition charge is extended, thereby energizing the first igniter and the second igniter at the same timing, while setting the timing of the start of combustion of the second gas generating agent to the first It may be configured to delay the timing of starting combustion of the gas generating agent.

In addition, in the first to eighth embodiments of the present invention described above, the case where only the gas generating agent is filled in the second combustion chamber has been described as an example, but in addition to the gas generating agent in the second combustion chamber It is good also as accommodating a transfer charge.

Further, in the first to eighth embodiments of the present invention described above, the first igniter and the second igniter are configured to be assembled to the bottom plate portion of the housing via the metal first and second holders, respectively. Although the case has been described as an example, both the first igniter and the second igniter may be configured to be assembled to the bottom plate portion of the housing by so-called insert molding. In that case, the disk-shaped gas generator will have a first holding part and a second holding part made of resin molded parts instead of the above-described first holder and second holder, and the first igniter and The second igniter is assembled to the bottom plate portion of the housing through the first holding portion and the second holding portion, respectively.

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

As a result, the first opening is buried by the first holding portion, and the first holding portion ensures the sealing performance of the portion, thereby ensuring the airtightness of the space inside the housing. In addition, the terminal pin of the first igniter may be configured such that a portion of the terminal pin penetrates the first holding portion and is pulled out to the outside. Further, in this case, for example, if the open end of the cup body is fitted to the first holding part and the cup body is fixed to the first holding part by press-fitting or the like, the transfer charge can be used to ignite the first igniter. It can also be placed facing the part.

Further, the second holding part can also be formed by injection molding using a mold in the same manner as the first holding part, and the fluid resin is injected so as to fill the space between the lower shell and the second igniter. It can be provided by pouring the material and allowing it to solidify. More specifically, the fluid resin material described above is passed through the second opening provided in the bottom plate portion of the lower shell so as to reach from a portion of the inner surface of the bottom plate portion to a portion of the outer surface of the bottom plate portion. The second igniter is attached to the bottom plate portion of the housing through the second holding portion by attaching it to the bottom plate portion and also to the base portion of the second igniter and solidifying the fluid resin material in this state. can be assembled into

As a result, the second opening is buried by the second holding portion, and the second holding portion ensures the sealing performance of the portion, thereby ensuring the airtightness of the space inside the housing. In addition, the terminal pin of the second igniter may be configured such that a portion of the terminal pin penetrates the second holding portion and is pulled out to the outside. Further, in this case, for example, if the open end of the substantially cylindrical partition member with a bottom is fitted to the second holding portion and the partition member is fixed to the second holding portion by press-fitting or the like, the second gas It is also possible to arrange the generant so as to face the ignition part of the second igniter.

Here, if the portion of the lower shell provided with the first opening and the second opening is projected toward the inside of the housing in a cylindrical shape, the first holding portion, the second holding portion, and the bottom plate portion By increasing the bonding area between them, it is possible to increase the bonding strength between them and secure a space for forming the female connector section inside the cylindrically bent portion of the housing.

As a raw material for the first holding portion and the second holding portion formed by injection molding, a resin material that is excellent in heat resistance, durability, corrosion resistance, etc. after curing is preferably selected and used. In that case, it is not limited to thermosetting resins represented by epoxy resins, etc., but is represented by polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin (for example, nylon 6, nylon 66, etc.), polypropylene sulfide resin, polypropylene oxide resin, etc. It is also possible to use a thermoplastic resin that When these thermoplastic resins are selected as raw materials, it is preferable that these resin materials contain glass fiber or the like as a filler in order to secure the mechanical strength of the first holding portion and the second holding portion after molding. However, if 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 having an adhesive layer provided in advance at predetermined positions on the surface of the bottom plate portion to be covered by the first holding portion and the second holding portion. good too. The adhesive layer can be formed by applying an adhesive to a predetermined position of the bottom plate in advance and curing the adhesive.

With this arrangement, the cured adhesive layer is positioned between the bottom plate portion and the first and second holding portions, so that the first and second holding portions formed of resin molded portions are separated. It becomes possible to make it adhere to a bottom-plate part more firmly. Therefore, if the adhesive layer is annularly provided along the circumferential direction so as to surround the first opening and the second opening provided in the bottom plate portion, it is possible to ensure a higher sealing performance in this portion. can also

Here, as the adhesive to be applied to the bottom plate in advance, one containing a resin material having excellent heat resistance, durability, corrosion resistance, etc. after curing as a raw material is preferably used. For example, a cyanoacrylate resin or a silicone-based resin as a raw material is 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, polyarylate resin, polyether ether ketone resin , polyamideimide-based resin, liquid crystal polymer, styrene-based rubber, olefin-based rubber, etc. as raw materials can be used as the above-mentioned adhesive.

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 fixed to the housing via a holding portion made of a resin molded portion. may be fixed to

Furthermore, the characteristic configurations shown in the first to eighth embodiments of the present invention described above can be combined with each other without departing from the gist of the present disclosure.

Thus, the above-described embodiments disclosed this time are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the scope of claims, and includes all changes within the meaning and scope of equivalents to the description of the scope of claims.

1A to 1H disk 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 Part 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 Crimped portion 32 First igniter 32a base portion 32b ignition portion 32c terminal pin 33 first seal member 34 cup body 34a top wall portion 34b side wall portion 34c flange portion 35 transfer chamber 36 transfer charge 40 second igniter assembly, 41 second holder, 41a upper concave portion, 41b lower concave portion, 41c through hole, 41d caulking portion, 42 second igniter, 42a base portion, 42b ignition portion, 42c terminal pin, 43 second sealing member, 44 partition portion, 45 Partition member 45a Fixed portion 45b Gas passage groove 46 Lid member 46a Blocking portion 46b Cylindrical portion 46b1 Gas passage groove 46c Stop portion 46d Annular protrusion 51 First gas generating agent 52 Second Gas generating agent 61 Lower support member 62 Upper support member 63 Cushion material 70 Filter S1 First combustion chamber S2 Second combustion chamber S3 Gas discharge chamber.

Claims (9)

a housing including a peripheral wall portion provided with a gas ejection port, a top plate portion closing one axial end of the peripheral wall portion, and a bottom plate portion closing the other axial end of the peripheral wall portion;
a cylindrical filter housed inside the housing such that the outer peripheral surface faces the inner peripheral surface of the peripheral wall;
It has a cup-like shape as a whole having a closed end on the top plate portion side, and is assembled to the bottom plate portion so that the space inside the filter is a first combustion chamber in which a first gas generating agent is accommodated. and a partition section for partitioning into a second combustion chamber containing the second gas generating agent;
a first igniter assembled to the bottom plate so as to face the first combustion chamber, which is a space outside the partition;
a second igniter assembled to the bottom plate so as to face the second combustion chamber, which is a space inside the partition;
The partition portion has openings at both ends in the axial direction and has a cylindrical partition member fixed to the bottom plate portion, and a lid member assembled to the partition member,
The lid member includes a closing portion that forms the closed end by covering an opening of the partition wall member located on the top plate portion side, and extends from the closing portion along the axial direction of the partition portion. and a cylindrical portion that is in close contact with a portion of the peripheral surface of the partition member near the top plate portion,
At least one of a peripheral surface of the cylindrical portion in close contact with the partition member and a peripheral surface of a portion of the partition member in close contact with the tubular portion is provided with the first combustion chamber and the second combustion chamber. A gas passage groove is provided for communicating with
When the second igniter is not in operation, the gas passage groove is not in communication with either or both of the first combustion chamber and the second combustion chamber,
At the time of operation of the second igniter, the state in which the cylindrical portion is in close contact with the partition member is maintained due to the pressure increase in the second combustion chamber caused by the combustion of the second gas generating agent. As the lid member moves toward the top plate portion side, the gas passage grooves allow the first combustion chamber and the second combustion chamber to communicate with each other. A gas generator in which generated gas passes through the gas passage groove and is introduced into the first combustion chamber. The gas passage groove is provided on the outer peripheral surface of the tubular portion so as to reach the end portion of the tubular portion on the bottom plate portion side,
By inserting the lid member into the partition member, the outer peripheral surface of the cylindrical portion provided with the gas passage groove is in close contact with the inner peripheral surface of the partition member near the top plate portion. The gas generator according to claim 1. The gas passage groove is provided on the inner peripheral surface of the tubular portion so as to reach the end portion of the tubular portion on the bottom plate portion side,
The inner peripheral surface of the cylindrical portion provided with the gas passage groove is in close contact with the outer peripheral surface of the partition member closer to the top plate portion by fitting the lid member onto the partition member. The gas generator according to claim 1. The gas passage groove is provided on the outer peripheral surface of the partition member so as to reach the end portion of the partition member on the top plate portion side,
By inserting the lid member onto the partition member, the outer peripheral surface of the partition member provided with the gas passage groove, which is closer to the top plate portion, is in close contact with the inner peripheral surface of the cylindrical portion. The gas generator according to claim 1. The gas passage groove is provided on the inner peripheral surface of the partition member so as to reach the end of the partition member on the top plate portion side,
By inserting the lid member into the partition member, the inner peripheral surface of the partition member provided with the gas passage groove, which is closer to the top plate portion, is in close contact with the outer peripheral surface of the cylindrical portion. The gas generator according to claim 1. A plurality of gas passage grooves are provided so as to be spaced apart from each other in the circumferential direction of the partition,
The gas generator according to any one of claims 1 to 5, wherein each of said plurality of gas passage grooves extends along the axial direction of said partition. The partition portion is provided with a full-circumference contact region in which the peripheral surface of the partition member and the peripheral surface of the cylindrical portion of the lid member are in close contact over the entire circumference of the partition portion,
When the second igniter is actuated, as the lid member moves toward the top plate portion side, the cylindrical portion is maintained in close contact with the partition member, and the entire circumference is in close contact. 7. The gas generator according to any one of claims 1 to 6, wherein said partition member and said cover member are released from close contact in a region. 8. The gas generator according to any one of claims 1 to 7, wherein movement of said cover member during operation of said second igniter is restricted by said top plate portion. At the time of operation of the first igniter, the top plate portion is deformed so as to expand outward due to a pressure increase in the first combustion chamber caused by combustion of the first gas generating agent. As a result, the distance between the top plate portion and the closing portion increases, and the increased distance is included in the movement allowance of the lid member when the second igniter is activated. 9. A gas generator according to claim 8.

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