JP7219194B2 - 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 provided with the gas ejection port in order 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, at the time of combustion of the first gas generating agent in the first combustion chamber, the gas passage hole allows the first gas generating agent to pass through the second gas generating agent contained in the second combustion chamber, which has not yet started to burn. It must be sealed so that combustion of the gas generant has no effect.

Therefore, in a certain type of dual-structured disk-type gas generator, the pressure partition is composed of a cup member including a closed end and a cup-shaped fragile cover member assembled to the cup member so as to cover the closed end. By providing a gas passage hole in the peripheral wall of the cup member, the gas passage hole is closed by the cover member when the first gas generating agent burns, and the second gas generating agent At the time of combustion, the cover member covering the gas passage hole is cleaved by the pressure generated by the combustion of the second gas generating agent, so that the second combustion chamber communicates with the first combustion chamber. is configured to

Further, in another type of dual-structure disk-type gas generator, the pressure partition wall is composed of two parts, a cup member including a closed end and a tubular member to which the cup member is assembled so as to be able to move relative to each other. By dividing the member into parts and providing gas passage holes in the peripheral wall of the cup member, the gas passage holes are closed by the cylindrical member when the first gas generating agent is burned, and when the second gas generating agent is burned In the above, the cup member moves relative to the tubular member due to the pressure generated by the combustion of the second gas generating agent, thereby exposing the gas passage hole and separating the second combustion chamber and the first combustion chamber. are configured to communicate with each other.

Documents disclosing the dual-structure disk-type gas generator having the former configuration include, for example, Japanese Patent Application Laid-Open No. 2007-131077 (Patent Document 1), and the dual-structure disk-type gas generator having the latter configuration. As a document disclosing is, there is Japanese Patent Publication No. 2009-517263 (Patent Document 2).

JP 2007-131077 A Japanese translation of PCT publication No. 2009-517263

By the way, the output characteristics of a gas generator are affected by the surrounding environment in which the gas generator is placed, and in particular depend on the ambient temperature. There is a tendency. That is, in a hot environment, the gas will come out faster and stronger, and in a cold environment, the gas will come out slower and weaker.

In gas generators, it is important for the gas generating agent to burn stably and sustainably during operation. It is necessary to put it under a predetermined high pressure environment. Therefore, normally, openings of gas discharge holes connecting the combustion chamber and the space outside the combustion chamber (in the dual-structure disk-type gas generator, the above-mentioned gas ejection port and gas passage hole correspond to this) opening By reducing the area to the desired size, the design is such that the pressure in the combustion chamber increases to a considerable extent during operation.

Here, in the above-described dual-structure disk-type gas generator, the volume of the second combustion chamber is inevitably smaller than the volume of the first combustion chamber due to structural restrictions. Therefore, in order to sufficiently increase the internal pressure of the second combustion chamber even when the disk-type gas generator operates in a particularly low-temperature environment, the opening area of the gas passage hole described above must be considerably increased. Therefore, it is necessary to design it as small as possible.

In this regard, in the dual-structure disk-type gas generators disclosed in Patent Documents 1 and 2, the opening area of the gas passage hole is set to 100% in order to ensure the increase in the internal pressure of the second combustion chamber under the above-described low-temperature environment. is designed to be considerably small, the internal pressure of the second combustion chamber may increase more than necessary when it operates in a high-temperature environment.

Thus, in order to ensure that the desired gas output is obtained while eliminating the influence of environmental temperature differences in the dual structure gas generator as much as possible, it is necessary to ensure that the gas generator is operated in a low-temperature environment. It is necessary to satisfy both the sustained combustion of the second gas generating agent and the suppression of pressure rise in the second combustion chamber during operation in high temperature environments.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-described problems, and is a dual-structure gas fuel cell that can reliably obtain a desired gas output during operation while eliminating the influence of differences in environmental temperature as much as possible. The purpose is to provide a generator.

A gas generator according to the present invention comprises a housing, a filter, a partition member, 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 member has a cup-like shape and includes a top wall portion located on the top plate portion side and a side wall portion facing the inner peripheral surface of the filter. The partition member is assembled to the bottom plate portion to divide the space inside the filter into a first combustion chamber containing a first gas generating agent and a second combustion chamber containing a second gas generating agent. It is divided into rooms. 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 member. A second igniter is assembled to the bottom plate portion so as to face the second combustion chamber, which is a space inside the partition member. The partition member has a first gas passage hole for allowing gas generated in the second combustion chamber to pass toward the first combustion chamber, and a second gas passage having an inner diameter larger than that of the first gas passage hole. A hole is provided. The partition member includes a shielding member having a first closing portion that closes the first gas passage hole by being applied to the outer surface of the partition member, and a second closing portion that covers the second gas passage hole. is assembled. When the second igniter is actuated, the shielding member is deformed and the first closing portion is displaced due to the pressure increase in the second combustion chamber caused by the combustion of the second gas generating agent. Accordingly, the closing of the gas passage hole by the first closing portion is released, and along with this, the gas generated in the second combustion chamber is introduced into the first combustion chamber by passing through the gas passage hole. be done. When the second igniter is activated, the shielding member ruptures or falls off due to the pressure increase in the second combustion chamber caused by the combustion of the second gas generating agent, and the second closing part is cleaved. Or, by falling off, the closure of the gas passage hole by the second closing portion is released, and along with this, the gas generated in the second combustion chamber passes through the gas passage hole, thereby causing the first combustion chamber to pass through. introduced into the combustion chamber.

In the gas generator based on the present invention, the first gas passage hole and the second gas passage hole may be provided in the top wall portion. In that case, the top wall portion may be covered and fixed with the shielding member.

The shielding member may be fixed to the peripheral surface of the large hole of the second gas passage hole by caulking or welding.

In the gas generator according to the present invention, a fragile portion may be provided in the first opening of the shielding member.

The shielding member may include a shoulder portion covering the partition member along a curved portion connecting the top wall portion and the side wall portion of the partition member.

A plurality of the first gas passage holes may be provided radially outwardly of the top wall portion of the second gas passage hole so as to be interspersed in the circumferential direction.

ADVANTAGE OF THE INVENTION According to this invention, it can be set as the gas generator of dual structure which can obtain a desired gas output reliably at the time of operation, eliminating the influence of the difference of an environmental temperature as much as possible.

1 is a schematic cross-sectional view of a disk-shaped gas generator 1A 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 plan view of a top wall portion of the partition member shown in FIG. 1; FIG. 2 is an assembly diagram of the shielding member shown in FIG. 1; 2 is a schematic cross-sectional view showing the first stage of operation of the disk-shaped gas generator 1A shown in FIG. 1. FIG. FIG. 6 is a schematic cross-sectional view taken along line VI-VI shown in FIG. 5; FIG. 3 is a schematic cross-sectional view showing a second stage during operation of the disk-shaped gas generator 1A shown in FIG. 1; FIG. 4 is a schematic cross-sectional view showing a third stage during high-pressure operation of the disk-type gas generator 1A shown in FIG. 1; FIG. 10 is a schematic cross-sectional view showing a third stage during high-pressure operation of the disk-shaped gas generator 1B according to Embodiment 2; FIG. 11 is a schematic cross-sectional view of a disk-shaped gas generator 1C according to Embodiment 3;

An embodiment of the present invention will be described in detail below with reference to FIG. 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 cross-sectional view of a disk-shaped gas generator 1A according to Embodiment 1, and FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. 3 is a plan view of the top wall portion of the partition member shown in FIG. 1. FIG. 4 is an assembly diagram of the shielding member shown in FIG. 1. 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 FIG. 1, the disk-shaped gas generator 1A has a short, substantially cylindrical housing with one axial end and the other end closed. A first igniter assembly 30, a second igniter assembly 40, a first gas generating agent 51, a second gas generating agent 52, a lower supporting member 61, an upper supporting member 62, a filter 70, etc. as internal components. It is something that is contained.

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, metal plates made of stainless steel, steel, aluminum alloy, etc. are used, and preferably 440 [MPa] or more and 780 [MPa]. A so-called high-strength steel sheet that does not cause damage such as breakage even when the following tensile stress 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 (that is, the axial direction of the peripheral wall portions 12 and 22) 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 drawing) is provided at a predetermined position of the flange portion 23 so as to penetrate along a direction parallel to the axial direction of the housing. 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, a transfer charge 36, and a combustion control member 37A. The first holder 31 constitutes the base of the first igniter assembly 30. By assembling the first igniter 32, the cup body 34, the combustion control member 37A, etc. to the first holder 31, A 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, or aluminum 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.

A crimped portion 31d is provided on the upper surface of the first holder 31 so as to surround the upper concave portion 31a. The crimped portion 31 d arranged inside of these is a portion for crimping and fixing the first igniter 32 to the first holder 31 .

The first igniter 32 is for generating a flame, and generally consists of a pyrotechnic product called a squib. The first igniter 32 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 base portion 32a and the ignition portion 32b include a cup-shaped squib cup and a plug that closes the open end of the squib cup and holds a pair of terminal pins 32c inserted therein. 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 is placed in the squib cup so as to surround or be close to the resistor. It has a configuration loaded with an ignition charge.

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 In the state of being abutted against the upper surface of the first holder 31, the flange portion 34c is pressed against the first holder 31 by a pressing portion 37d of the combustion control member 37A, which will be described later, thereby being fixed to the first holder 31. there is

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.

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. Become.

As shown in FIG. 1, the combustion control member 37A has a substantially cylindrical shape and has a barrier portion 37a, an open portion 37b, a fixed portion 37c, and a pressing portion 37d. The combustion control member 37A is made of a non-brittle member that does not explode or melt when the transfer charge 36 burns, and is made of metal such as stainless steel or steel. Moreover, as a non-fragile member that does not burst or melt during operation, a heat-resistant resin such as polyimide resin or polyamide resin having a melting point of 300° C. or higher may be used.

The combustion control member 37A is arranged so that its axial direction is parallel to the axial direction of the housing. It functions as a fixed portion 37c. More specifically, the fixed portion 37c has a substantially cylindrical shape, and the portion to be fixed 37c projects from the bottom plate portion 11 toward the first combustion chamber SA1, which will be described later. By being press-fitted into the first holder 31 , the combustion control member 37A is assembled to the bottom plate portion 11 via the first holder 31 .

The combustion control member 37A is for controlling the spread of the flame of the first gas generating agent 51, which is ignited by the combustion of the transfer charge 36, and more specifically, the flame generated by the combustion of the transfer charge 36 is controlled. Directivity is provided so that the fuel is ejected from the transfer chamber 35 in a predetermined direction. The function of imparting directivity to the flame generated by burning the transfer charge 36 is mainly exhibited by the barrier portion 37a and the open portion 37b provided in the combustion control member 37A.

That is, the barrier portion 37a is formed by the side wall portion 34b of the portion of the top wall portion 34a and the side wall portion 34b of the cup body 34 that defines the transfer chamber 35, which is located on the opposite side of the portion located near the central axis of the housing. The opening portion 37b is positioned so as to expose the top wall portion 34a and the side wall portion 34b of the portion near the central axis of the housing.

As a result, when the transfer charge 36 burns, the portion of the top wall portion 34a and the side wall portion 34b of the cup body 34 exposed by the open portion 37b bursts or melts due to the combustion of the transfer charge 36. As a result, the flame generated by the combustion of the transfer charge 36 is spouted into the first combustion chamber S1 in a predetermined direction.

The holding portion 37d is formed by bending the combustion control member 37A between the barrier portion 37a and the fixed portion 37c. The cup body 34 is fixed to the first holder 31 as described above by being pressed against the upper surface.

As shown in FIG. 1, 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 the outer peripheral edge thereof It is fixed by joining. As a result, the first igniter assembly 30 integrated by previously assembling the first igniter 32, the cup body 34, the combustion control member 37A, and the like to the first holder 31 is attached to the lower shell 10. will be fixed.

Therefore, the first holder 31 is configured to protrude from the bottom plate portion 11 toward the space inside the housing. 35 will be located in 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, the partition portion 44, etc. to the second holder 41, the second igniter assembly A solid 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, iron steel, aluminum alloy, or the like. 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 is made of a pyrotechnic product generally called a squib, like the first igniter 32 described above. The second igniter 42 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 . The igniter 42b contains therein an igniter that ignites and burns during operation to generate a flame, and a resistor (bridge wire) for igniting the igniter. A pair of terminal pins 42c are connected to the ignition portion 42b to ignite the ignition charge.

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.

As shown in FIGS. 1 to 2 and 3 , the partition 44 has a cup-like shape as a whole and includes a partition member 45 , a shielding member 46 and a fastening portion 47 . Among them, the partition member 45 and the shield member 46 particularly function as a pressure partition wall that divides the space inside the housing and inside the filter 70 into two chambers.

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

The partition 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 . More specifically, as will be described later, the fixed portion 45c provided at the lower end of the partition member 45 of the partition portion 44 is press-fitted into the second holder 41, whereby the partition portion 44 moves the second holder 41. It is attached to the bottom plate portion 11 via 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.

The partition member 45 has a bottomed substantially cylindrical shape with an open end on the bottom plate portion 11 side, and functions as a pressure partition as described above. , a metal member such as a stainless alloy. The partition member 45 has a substantially disc-shaped top wall portion 45 a located on the top plate portion 21 side and a substantially cylindrical side wall portion 45 b facing the inner peripheral surface of the filter 70 . The side wall portion 45 b extends from the peripheral edge of the top wall portion 45 a toward the bottom plate portion 11 along the axial direction of the partition member 45 .

The partition member 45 is assembled to the bottom plate portion 11 by inserting the open end provided at the lower end thereof into the second holder 41 . More specifically, the lower end of the side wall portion 45b of the partition member 45 functions as a fixed portion 45c fixed to the second holder 41. By being press-fitted into the second holder 41 , the partition member 45 is fixed to the second holder 41 and assembled to the bottom plate portion 11 .

As shown in FIG. 3, the top wall portion 45a of the partition member 45 is provided with a plurality of gas passage holes 48. As shown in FIG. The plurality of gas passage holes 48 includes first gas passage holes 48a and second gas passage holes 48b, and the opening area of the second gas passage holes 48b is larger than that of the first gas passage holes 48a. The gas passage hole 48 is for passing the gas generated in the second combustion chamber S2 toward the first combustion chamber S1. The first gas passage holes 48a are provided in a dotted line along the circumferential direction in the top wall portion 45a of the partition member 45, and each of the first gas passage holes 48a extends along the thickness direction of the top wall portion 45a. is provided to pass through the The second gas passage hole 45b is provided with a portion through which a fastening portion 47 for fixing the shielding member 46 is inserted to the partition member 45, and penetrates the top wall portion 45a along the thickness direction of the top wall portion 45a. is provided as follows. The second gas passage holes 48b are formed in the top wall portion 45a so as to be arranged at the same distance from each of the plurality of first gas passage holes 48a provided in a dotted line along the circumferential direction of the partition member 45. located in the center.

As shown in FIGS. 1 and 3 , the shielding member 46 is fixed to the partition member 45 while being placed on the outer surface of the top wall portion 45 a of the partition member 45 . The shielding member 46 includes a first closing portion 46a located on the outer peripheral edge side and a second closing portion 46b located on the center side. The first closing portion 46 a is a portion for closing the plurality of first gas passage holes 48 a provided in the top wall portion 45 a of the partition member 45 . A shoulder portion 49 is formed radially outward from the first closing portion 46 a , and the shoulder portion 49 is curved along the partition member 45 . On the other hand, the second closing portion 46 b is a portion for closing the single second gas passage hole 48 b provided in the top wall portion 45 a of the partition member 45 . A second closing portion 46b of the shielding member 46 is provided with a fragile portion 46c. A fastening portion 47 , which will be described later, extends from the second closing portion 46 b , and a connecting portion 48 connects the first closing portion 46 a and the fastening portion 47 .

The fragile portion 46 c is provided by radially extending slits and is configured to have a lower mechanical strength than the fastening portion 47 of the shielding member 46 . Here, the fragile portion 46c is arranged so as to face the ignition portion 42b of the second igniter assembly 40. As shown in FIG. In addition, portions other than the radially extending fragile portion 46c are thicker than the fragile portion and have approximately the same thickness as the shielding member 46. As shown in FIG.

As a result, the fragile portion 46c bursts, deforms, or melts due to the thrust generated by the combustion of the gas generated in the second combustion chamber S2, and the mechanical strength of the fragile portion 46c is relatively high. getting low.

The thickness t1 of the fragile portion 46c and the thickness t2 of the shielding member 46 described above are appropriately adjusted based on the type and filling amount of the second gas generating agent 52 to be used. . For example, when the shield member 46 is made of iron or stainless steel, the thickness t1 of the fragile portion 46c is set to 0.6 mm or less, preferably 0.3 mm or less. On the other hand, when the shielding member 46 is made of iron or stainless steel, the thickness t2 of the shielding member 46 is 0.3 mm or more and 0.9 mm or less, preferably 0, provided that it is larger than the thickness t1 of the fragile portion 46c. .4 mm or more and 0.7 mm or less.

The shielding member 46 has an annular plate-like shape and functions as a pressure partition and a pressure regulator as described above. It is composed of a metal member such as a stainless alloy.

As shown in FIGS. 3 and 4, the fastening portion 47 is fixed by caulking or welding in this embodiment, and as shown in FIG. In a state in which the shielding member 46 is attached to the outer surface of the second gas passage hole 48b provided in the partition member 45 and the fastening protrusion 47a provided in the shielding member 46, the above-described second gas passage hole 48b As shown in FIG. 4(b), the partition member 45 is crimped so that the peripheral end portion of the fastening protrusion 47a is crushed as shown in FIG. 4(c). and the shielding member 46 are clamped to fix them. Alternatively, the partition member 45 and the shielding member 46 are clamped and fixed by welding the peripheral end portions of the fastening protrusions 47a.

As a result, the shielding member 46 is fixed at a position corresponding to the central portion of the top wall portion 45a of the partition member 45 by the fastening portion 47, so that the shielding member 46 is applied to the outer surface of the top wall portion 45a. It is fixed to the partition member 45 in this state. Therefore, the single second gas passage hole 48b provided in the top wall portion 45a of the partition member 45 is closed by the second closing portion 46b of the shielding member 46. As shown in FIG.

Here, the shielding member 46 is configured to be sufficiently thinner than the partition member 45 . Specifically, when the second gas generating agent 52 is burned, the shielding member 46 reduces the pressure of the second combustion chamber S2 through the plurality of gas passage holes 48 between the first closing portion 46a and the second closing portion 46b. The thickness of the shielding member 46 is adjusted so that the first closing portion 46a and the second closing portion 46b can be displaced outward by receiving (that is, the shielding member 46 is deformed with the fixed portion 46a as a base point). is sufficiently thin. By configuring in this manner, the operation of the disk-type gas generator 1A according to the present embodiment, which will be described in detail later, can be realized.

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, which is integrated by assembling the second igniter 42, the partition part 44 and the like to the second holder 41, is fixed to the lower shell 10. Become.

Therefore, the second holder 41 is configured to protrude from the bottom plate portion 11 toward the space inside the housing. A chamber S2 will be located in 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 45 b of the partition member 45 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.

However, as described above, since the combustion control member 37A of the first igniter assembly 30 is arranged in the first combustion chamber S1, the portion where the barrier portion 37a of the combustion control member 37A is located, The side wall portion 34b of the cup body 34 does not directly face the first gas generating agent 51, and the barrier portion 37a is interposed therebetween.

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 oxidizing agents include basic metal hydroxides such as basic copper nitrate and basic copper carbonate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, alkaline earth metals, and transition metals. , nitrates containing cations selected from ammonia, etc. are utilized. 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, foamed urethane, etc.), chloroprene, EPDM, and other rubbers. Note that the cushion material 63 is burnt out by combustion of the first gas generating agent 51 .

If it is necessary 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 cushioning material is arranged between the closed end of the partition part 44 located on the top plate part 21 side and the second gas generating agent 52, or an annular disk-shaped cushioning material is provided. It can be arranged either between the upper surface of the second holder 41 surrounding the second igniter 42 and the second gas generating agent 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.

FIG. 5 is a schematic cross-sectional view showing the first stage of operation of the disk-type gas generator according to the present embodiment, and FIG. 6 is a schematic cross-sectional view along line VI-VI shown in FIG. be. FIG. 7 is a schematic cross-sectional view showing the second stage of operation of the disk-shaped gas generator 1A according to this embodiment. FIG. 8 is a schematic cross-sectional view showing the third stage during high-pressure operation of the disk-type gas generator 1A according to this embodiment. Next, operation of the disk-shaped gas generator 1A according to the present embodiment will be described with reference to FIGS. 5 to 8. 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 FIGS. 5 and 6, 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 portion 32b bursts due to the combustion of the ignition charge. 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. . As the cup body 34 ruptures or melts, the transfer chamber 35 communicates with the first combustion chamber S1, and the large amount of heat particles described above flow into the first combustion chamber S1 (see arrow AR1).

At this time, of the top wall portion 34a and the side wall portion 34b of the cup body 34, part of the side wall portion 34b is covered with the barrier portion 37a of the combustion control member 37A. (that is, the portion of the cup body 34 exposed toward the first combustion chamber S1 by the open portion 37b of the combustion control member 37A) bursts or melts and is covered with the barrier portion 37a The part remains without bursting or melting.

As a result, the flame generated by the combustion of the transfer charge 36 blows out toward the top plate portion 21 side of the upper shell 20 and the central axis side of the housing, as indicated by an arrow AR1 in the drawing. , is prevented from blowing out to the side where the barrier portion 37a is located when viewed from the transfer chamber 35. Therefore, among the first gas generating agents 51 positioned around the first igniter assembly 30, the first gas generating agents 51 positioned in directions other than the direction in which the barrier portion 37a is positioned when viewed from the transfer chamber 35 are It is ignited and starts burning.

Of the first gas generating agents 51 positioned around the first igniter assembly 30, the first gas generating agent 51 positioned on the barrier portion 37a side when viewed from the transfer chamber 35 starts burning first. Combustion is started at a delayed timing along with the spread of the flame of the first gas generating agent 51 .

As the first gas generating agent 51 burns, a large amount of gas is generated in the first combustion chamber S1. 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.

At this time, the seal tape 25 closing the plurality of gas ejection ports 24 is torn due to an increase in pressure inside the housing caused by combustion of the first gas generating agent 51 . 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 AR2).

At this time, due to the pressure increase inside the housing caused by the combustion of the first gas generating agent 51, the bottom plate portion 11 of the lower shell 10 and the top plate portion 21 of the upper shell 20 are pushed outward. It transforms so that it swells toward you. As a result, the distance between the top plate portion 21 of the upper shell 20 and the end of the partition portion 44 on the top plate portion 21 side is increased.

On the other hand, in the first stage, the shield 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 first closing portion 46a and the second closing portion 46b of the shielding member 46, and the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 is closed. Since the first closing portion 46a and the second closing portion 46b of the shielding member 46 are in close contact with each other, the covered state is maintained.

As a result, the plurality of gas passage holes 48 provided in the top wall portion 45a of the partition member 45 are kept closed by the first closing portion 46a and the second closing portion 46b of the shielding member 46. Become. Therefore, in the first stage, the first combustion chamber S1 and the second combustion chamber S2 do not communicate with each other, and the first gas generating agent 51 does not reach the second gas generating agent 52 that has not yet started to burn. will no longer be affected by the combustion of

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 inside of the airbag provided adjacent to the disk-shaped gas generator A. to inflate and deploy the airbag.

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. 7, 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 becomes difficult to be interrupted.

At that time, due to the pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, the pressure in the second combustion chamber S2 increases through the gas passage hole 48 to the second pressure of the shielding member 46. It is applied to the first closure part 46a and the second closure part 46b. As a result, when the internal pressure of the second combustion chamber S2 rises to a certain extent, the first closing portion 46a of the shielding member 46 is deformed with the fastening portion 47 as the base point, and the first closing portion 46a moves outward. It is directed (that is, displaced toward the top plate portion 21 side).

Due to this displacement of the first closing portion 46a, the first closing portions 46a of the plurality of first gas passage holes 48a are all released. The chamber S2 is in communication with the chamber S2 through the plurality of first gas passage holes 48a. Along with this, the gas generated in the second combustion chamber S2 passes through the plurality of gas passage holes 48a and is introduced into the first combustion chamber S1 (see arrow AR3).

The gas generated in the second combustion chamber S2 and introduced into the first combustion chamber S1 through the first gas passage holes 48a of the gas passage holes 48 described above then passes through the inside of the filter 70. , heat is removed by the filter 70 and cooled, and slag contained in the gas is removed by the filter 70 and flows into the gas discharge chamber S3, and then through the plurality of gas ejection ports 24 to the outside of the housing. (see arrow AR2).

As shown in FIG. 8, in the second stage in which the second igniter 42 of FIG. When the whole is already heated to a high temperature, the process proceeds to the third step. Due to the pressure increase in the second combustion chamber S2, the pressure of the second combustion chamber S2 is applied to the second closing portion 46b of the shielding member 46 via the second gas passage hole 48b. As a result, when the internal pressure of the second combustion chamber S2 rises to a certain extent, the second closing portion 46b of the shielding member 46 deforms with the fastening portion 47 as the base point, and the second closing portion 46b moves outward. It is directed (that is, cleaved toward the top plate portion 21 side).

Due to this displacement of the second closing portion 46b, the second closing portion 46b of the second gas passage hole 48b is released, and in the third stage, the first combustion chamber S1 and the second combustion chamber S2 are separated. A state of communication is established through the second gas passage hole 48b. Accordingly, the gas generated in the second combustion chamber S2 passes through the second gas passage hole 48b and is introduced into the first combustion chamber S1 (see arrow AR4).

The gas generated in the second combustion chamber S2 and introduced into the first combustion chamber S1 through the second gas passage holes 48b described above then passes through the inside of the filter 70, where it is heated by the filter 70. is removed and cooled, slag contained in the gas is removed by the filter 70, flows into the gas discharge chamber S3, and is then jetted out of the housing through a plurality of gas jet ports 24. (see arrow AR2).

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

After that, the first gas generating agent 51 accommodated in the first combustion chamber S1 and the second gas generating agent 52 accommodated in the second combustion chamber S2 are all burned up, thereby operating the disk-type gas generator 1A. is completed.

As described above, in the disk-shaped gas generator 1A according to the present embodiment, the second filter that closes the gas passage hole 48 provided in the partition member 45 by being applied to the outer surface of the partition member 45 is applied. A first closing portion 46 a and a second closing portion 46 b are provided on the shielding member 46 , and the shielding member 46 is fixed to the partition member 45 at the fastening portion 47 . With this configuration, as described above, the first gas passage hole 48a is opened by displacing the first closing portion 46a in the second stage and the third stage during operation, and furthermore, the second gas passage hole 48a is opened. The second gas passage hole 48b is opened by splitting the closed portion 46b, whereby the gas generated in the second combustion chamber S2 is introduced into the first combustion chamber S1.

Here, in the above-described second stage, between the outer surface of the top wall portion 45a in the portion defining the first gas passage hole 48a and the first closing portion 46a in the portion facing the outer surface of the top wall portion 45a. The gap formed in , serves as a narrowed portion of the gas flow path that connects the second combustion chamber S2 and the first combustion chamber S1.

If the channel cross-sectional area of this constricted portion is referred to as the degree of opening of the first gas passage hole 48a, the degree of opening of the gas passage hole 48 is determined by the magnitude of displacement occurring in the first closing portion 46a. Here, the magnitude of the displacement that occurs in the first closing portion 46a basically depends on the pressure in the second combustion chamber S2.

Therefore, in the disk-type gas generator 1A according to the present embodiment, the opening degree of the first gas passage hole 48a changes depending on the pressure in the second combustion chamber S2. As the pressure in the second combustion chamber S2 rises due to the combustion of the second gas generating agent 52, the pressure applied to the first closing portion 46a also gradually increases and the amount of displacement thereof also increases. The opening degree of the 1-gas passage hole 48a also gradually increases.

Therefore, in the initial stage of combustion immediately after the combustion of the second gas generating agent 52 is started, the pressure rise in the second combustion chamber S2 is relatively small, and the opening degree of the first gas passage hole 48a is relatively small during that period. As a result, a large flow path resistance occurs at the constricted portion of the gas flow path connecting the second combustion chamber S2 and the first combustion chamber S1, and as a result, the internal pressure of the second combustion chamber S2 is promoted.

On the other hand, in the middle stage of combustion or the final stage of combustion after a considerable amount of time has passed from the start of combustion of the second gas generating agent 52, the pressure rise in the second combustion chamber S2 becomes relatively large. The opening degree of the hole 48a becomes relatively large, and along with this, the passage resistance generated at the constricted portion of the gas passage connecting the second combustion chamber S2 and the first combustion chamber S1 is reduced, and as a result, the second combustion chamber S2 excessive increase in internal pressure is suppressed.

Furthermore, in the third stage, between the outer surface of the portion of the top wall portion 45a that defines the second gas passage hole 48b and the portion of the second closing portion 46b that faces the outer surface of the top wall portion 45a. The gap that is formed serves as a constricted portion of the gas flow path that connects the second combustion chamber S2 and the first combustion chamber S1, as in the second stage.

Therefore, in the disk-shaped gas generator 1A according to the present embodiment, the second gas passage hole 48b is cleaved by the pressure of the second combustion chamber S2. More specifically, as the pressure in the second combustion chamber S2 rises due to the combustion of the second gas generating agent 52, the pressure applied to the second closing portion 46b also gradually increases. The passage hole 48b is cleaved.

As explained in the second and third steps, this also eliminates the influence of environmental temperature differences in the surrounding environment in which the disk-type gas generator 1A is placed, and during operation in a low-temperature environment and the suppression of pressure rise in the second combustion chamber S2 during operation in a high-temperature environment. As a result, the gas output characteristics of the disk-type gas generator 1A are stabilized.

Therefore, the disk-type gas generator 1A according to the present embodiment has a dual structure that can reliably obtain a desired gas output during operation while eliminating as much as possible the influence of differences in environmental temperature. It becomes a disk type gas generator.

Further, in the disk-type gas generator 1A according to the present embodiment, as described above, the top wall portion 45a of the partition member 45 is provided with the plurality of gas passage holes 48, so that the gas passage holes 48 The blown gas is not directly sprayed to the filter 70 at a close distance. Therefore, damage to the filter 70 is avoided. Moreover, a detouring gas flow path is formed by the shoulder portion 49, and the ejected gas collides with the shielding member. Therefore, slag collection and gas cooling are more effectively performed.

In this respect, in order to further ensure the prevention of damage to the filter 70, a cover should be provided to cover the boundary portion between the filter 70 and the top plate portion 21 of the upper support member 62 before the disk-type gas generator 1A operates. The end of the partition member 45 on the side of the top plate 21 faces the portion of the insulator that covers the end of the filter 70 on the side of the top plate 21 along the radial direction of the housing. do it.

With this configuration, the gas ejected from the gas passage hole 45c provided at a position closer to the filter 70 among the plurality of gas passage holes 48 is also sprayed onto the upper support member 62, thereby moving in the traveling direction. is changed, and the air is jetted out exclusively toward the bottom plate portion 11 side of the lower shell 10 . Therefore, it is possible to prevent the gas from being directly sprayed onto the filter 70 and prevent the filter 70 from being damaged.

Further, in the disk-shaped gas generator 1A according to the present embodiment, the gas ejected from each of the plurality of gas passage holes 48 is ejected to the first closing portion 46a and then to the upper support member 62. Since it is configured to be sprayed, a secondary effect is also obtained in which slag contained in the gas can be effectively collected.

In addition, in the disk-shaped gas generator 1A according to the present embodiment, as shown in FIG. 8, the partition member 45 is fixed to the fastening portion 47 of the second gas passage hole 48b by caulking or welding. By providing this portion, in the unlikely event that the internal pressure of the second combustion chamber S2 rises to an unintended pressure, the pressure pushes the partition member 45 toward the top plate portion 21 side against the fixing force to the second holder 41. The second gas passage hole 48b is opened so as not to move, the movement is suppressed, and the separation of the partition member 45 can be prevented.

Furthermore, by providing this portion, after the partition member 45 moves, a sufficient gap is not formed between the partition member 45 and the upper support member 62 in the portion where the plurality of gas passage holes 48 are provided, It is possible to prevent the plurality of gas passage holes 48 from being clogged, and to prevent an excessive increase in internal pressure of the second combustion chamber S2.

In this embodiment, a case where a plurality of gas passage holes are provided in the top wall portion of the partition member has been described as an example, but a single gas passage hole may be provided in the top wall portion. . Also, the gas passage holes may be provided in the side wall portion of the partition member. It should be configured so that it can be separated.

Also, the shielding member may be fixed to the partition wall member so that the gas passage hole is closed by the closing portion, and the gas passage hole may be provided in the top wall portion or the side wall portion of the partition member. It may be provided on either the top wall portion or the side wall portion of the partition member.

(Embodiment 2)
In the first embodiment of the present invention shown in FIG. 1 described above, the configuration in which the second closing portion 46b of the shielding member 46 is cleaved in the third stage has been described, but as shown in FIG. The operation of the third paragraph can also be realized by dropping the member 46 . For example, such an operation can be realized by shortening the length of the fastening portion 47 in the radial direction as much as possible and not providing the second closing portion 46b of the shielding member 46 with a fragile portion. In such a configuration, the operation modes in the first stage and the second stage are the same. Therefore, without repeating the same description, the state of the operation of the third stage will be described.

After passing through the first stage and the second stage, it shifts to the third stage. Due to the pressure increase in the second combustion chamber S2, the pressure of the second combustion chamber S2 is applied to the second closing portion 46b of the shielding member 46 via the second gas passage hole 48b. As a result, when the internal pressure of the second combustion chamber S2 increases to some extent, pressure is applied to the second closing portion 46b of the shielding member 46, causing the second closing portion 46b to move outward (that is, toward the top plate portion 21 side).

Due to the falling off of the second closing portion 46b, the second closing portion 46b of the second gas passage hole 48b is released, and in the third stage, the first combustion chamber S1 and the second combustion chamber S2 are separated. A state of communication is established through the second gas passage hole 48b. Accordingly, the gas generated in the second combustion chamber S2 passes through the second gas passage hole 48b and is introduced into the first combustion chamber S1 (see arrow AR4).

The gas generated in the second combustion chamber S2 and introduced into the first combustion chamber S1 through the second gas passage holes 48b described above then passes through the inside of the filter 70, where it is heated by the filter 70. is removed and cooled, slag contained in the gas is removed by the filter 70, flows into the gas discharge chamber S3, and is then jetted out of the housing through a plurality of gas jet ports 24. (see arrow AR2).

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

After that, all of the first gas generating agent 51 accommodated in the first combustion chamber S1 and the second gas generating agent 52 accommodated in the second combustion chamber S2 are completely burned, whereby the disk-shaped gas generator 1B operates. is completed.

As described above, in the disk-shaped gas generator 1B according to the present embodiment, the second filter that closes the gas passage hole 48 provided in the partition member 45 by being applied to the outer surface of the partition member 45 is applied. A first closing portion 46 a and a second closing portion 46 b are provided on the shielding member 46 , and the shielding member 46 is fixed to the partition member 45 at the fastening portion 47 . With this configuration, as described above, the first gas passage hole 48a is opened by displacing the first closing portion 46a in the second stage and the third stage during operation, and furthermore, the second gas passage hole 48a is opened. The second gas passage hole 48b is opened by dropping the shielding member 46 by applying pressure to the closing portion 46b, so that the gas generated in the second combustion chamber S2 is introduced into the first combustion chamber S1. is configured to

(Embodiment 3)
Embodiment 3 of the present invention is different from Embodiment 1 in the location where first gas passage holes 48b are provided in partition member 45, and is the same as Embodiment 1 in other respects.

As shown in FIG. 10, the top wall portion 45a of the partition member 45 is provided with a second gas passage hole 48b. The plurality of first gas passage holes 48a are provided on the side wall portion 45b of the partition member 45 near the top wall portion 45a. Here, the opening area of the second gas passage holes 48b is larger than that of the first gas passage holes 48a. The gas passage hole 48 is for passing the gas generated in the second combustion chamber S2 toward the first combustion chamber S1. The first gas passage holes 48a are provided along the circumferential direction in the side wall portion 45b of the partition member 45, and each of the first gas passage holes 48a is provided so as to pass through the side wall portion 45b along the thickness direction of the side wall portion 45b. ing. The second gas passage hole 48b is provided with a portion through which a fastening portion 47 for fixing the shielding member 46 is inserted to the partition member 45, and penetrates the top wall portion 45a along the thickness direction of the top wall portion 45a. is provided as follows. The first gas passage hole 48 a is covered with the shoulder portion 49 of the shielding member 46 .

By adopting the third embodiment as described above, in the first stage, the gas is jetted in the circumferential direction of the partition member 45, collides with the shielding member 46, and is jetted downward when viewed from the axial direction of the housing. becomes.

(Other forms, etc.)
In the first embodiment of the present invention described above, the first igniter and the second igniter are energized at different timings, so that the second igniter operates at a timing delayed from the operation timing of the first igniter. Although the explanation has been given by exemplifying the case where the components are configured to operate, they may be configured to operate at the same timing by being energized 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.

Further, in the first embodiment 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. may be accommodated.

Further, in the first embodiment of the present invention described above, when the first igniter and the second igniter are assembled to the bottom plate portion of the housing via the metal first holder and second holder, respectively, , but both the first igniter and the second igniter may be assembled to the bottom plate of the housing by so-called insert molding. In that case, the disk-type gas generator will have a first holding part and a second holding part made of 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 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 the

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 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 the

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. In this case, for example, the opening end of the substantially cylindrical partition member with a bottom may be fitted onto the second holding portion to fix the partition member to the second holding portion by press fitting or the like, or the partition member may be attached to the bottom plate. The second gas generating agent can also be arranged so as to face the ignition part of the second igniter by welding to the part.

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. In that case, it becomes possible to press-fit the cup body or the partition member into 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 secure a higher sealing performance in the portion. .

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

In addition, as in the first to third embodiments of the present invention described above, the bases of the first igniter assembly and the second igniter assembly are configured by the first holder and the second holder, respectively. A first igniter assembly is formed by joining the first holder and the first igniter with the resin molded portion, and joining the second holder and the second igniter with the resin molded portion. Thus, the second igniter assembly may be configured, and the first holder and the second holder may be joined to the bottom plate portion by welding or the like.

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

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 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, 24 gas outlet, 25 seal tape, 30 first igniter assembly, 31 first holder, 31a upper concave portion, 31b lower concave portion, 31c through hole, 31d, 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 37A combustion control member 37a barrier portion 37b opening portion 37c Part to be fixed 37d Pressing part 37e Flange part 40 Second igniter assembly 41 Second holder 41a Upper concave part 41b Lower concave part 41c Through hole 41d Crimping part 42 Second igniter 42a Base , 42b ignition portion, 42c terminal pin, 43 second seal member, 44 partition portion, 45 partition member, 45a top wall portion, 45b side wall portion, 45c fixed portion, 46 shielding member, 46a first closing portion, 46b second second Closed portion 46c Weak portion 47 Fastening portion 47a Fastening protrusion 48 Gas passage hole 48a First gas passage hole 48b Second gas passage hole 49 Shoulder 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 (6)

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 including a top wall portion located on the top plate portion side and a side wall portion facing the inner peripheral surface of the filter, and is assembled to the bottom plate portion to fill the space inside the filter. a partition member partitioning the first combustion chamber containing the first gas generating agent and the second combustion chamber containing the second gas generating agent;
a first igniter assembled to the bottom plate portion so as to face the first combustion chamber, which is a space outside the partition member;
a second igniter assembled to the bottom plate portion so as to face the second combustion chamber, which is a space inside the partition member;
The partition member includes a first gas passage hole for allowing gas generated in the second combustion chamber to pass toward the first combustion chamber, and a second gas passage having an inner diameter larger than that of the first gas passage hole. holes are provided,
The partition member includes a shielding member including a first closing portion that closes the first gas passage hole by being applied to the outer surface of the partition member, and a second closing portion that covers the second gas passage hole. is assembled,
When the second igniter is actuated, the shielding member is deformed and the first closing portion is displaced due to the pressure increase in the second combustion chamber caused by the combustion of the second gas generating agent. Accordingly, the closing of the gas passage hole by the first closing portion is released, and along with this, the gas generated in the second combustion chamber is introduced into the first combustion chamber by passing through the gas passage hole. is,
When the second igniter is actuated, the shielding member ruptures or falls off due to the pressure increase in the second combustion chamber caused by the combustion of the second gas generating agent, and the second closing part is cleaved. Alternatively, the closing of the gas passage hole by the second closing portion is released by falling off, and along with this, the gas generated in the second combustion chamber passes through the gas passage hole, thereby causing the first combustion chamber to pass through. introduced into the combustion chamber,
gas generator. The first gas passage hole and the second gas passage hole are provided in the top wall,
2. The gas generator according to claim 1, wherein said top wall portion is covered with and fixed to said shielding member. 3. The gas generator according to claim 2, wherein said shielding member is fixed to the peripheral surface of said second gas passage hole of said partition member by caulking or welding. 4. A gas generator as claimed in claim 3, wherein the second closure portion of the shield member has a weakened portion. The gas according to any one of claims 1 to 4, wherein the shielding member includes a shoulder portion covering the partition member along a curved portion connecting the top wall portion and the side wall portion of the partition member. generator. The first gas passage hole according to any one of claims 1 to 5, wherein a plurality of the first gas passage holes are provided radially outwardly in the top wall portion of the second gas passage hole and scattered in the circumferential direction. Gas generator as described.

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