JP7175165B2 - 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, when the first gas generating agent burns in the first combustion chamber, the gas passage hole affects the second gas generating agent accommodated in the second combustion chamber, which has not yet started burning. It is necessary to be sealed so that there is no accident.

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

Documents disclosing such a dual-structure disk-type gas generator include, for example, Japanese Utility Model Registration No. 3180828 (Patent Document 1).

Utility Model Registration No. 3180828

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, the opening area of the gas passage hole is designed to be considerably small so that the internal pressure of the second combustion chamber is sufficiently increased even when the disk-type gas generator operates in a particularly low-temperature environment. It becomes necessary to However, in such a configuration, when the gas generator is operated in a high-temperature environment, the internal pressure of the second combustion chamber may increase more than necessary.

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, a first igniter and a second igniter. The housing includes a peripheral wall portion provided with a gas ejection port, a top plate portion closing one axial end of the peripheral wall portion, and a bottom plate portion closing the other axial end of the peripheral wall portion. . The filter is a cylindrical member housed inside the housing so that its outer peripheral surface faces the inner peripheral surface of the peripheral wall portion. The partition part has a cup-like shape as a whole with a closed end on the side of the top plate part, and is assembled to the bottom plate part so that the space inside the filter is filled with the first gas generating agent. and a second combustion chamber containing a second gas generating agent. The first igniter is attached to the bottom plate portion so as to face the first combustion chamber, which is a space outside the partition portion. The second igniter is attached to the bottom plate portion so as to face the second combustion chamber, which is a space inside the partition portion. The partition section includes a cylindrical partition member having openings at both ends in the axial direction and fixed to the bottom plate, and a cap member assembled to the partition member to form the closed end. ing. The cap member includes a top plate portion that forms the closed end by covering the opening of the partition member located on the top plate portion side, and extends from the peripheral edge of the top plate portion along the axial direction of the partition member. As a result, a cup-like shape including the peripheral plate portion facing the partition member is formed. Either one of the peripheral plate portion and the partition wall member is provided with a first gas passage hole, and the first gas passage hole is located in the first gas passage of the peripheral plate portion and the partition wall member. It is covered by the side without gas passage holes. A second gas passage hole is provided in either one of the peripheral plate portion and the partition wall member, and the second gas passage hole is provided in the second gas passage hole of the peripheral plate portion and the partition wall member. It is covered by the side without gas passage holes. The first gas passage hole is positioned closer to the top plate portion than the second gas passage hole in the axial direction of the partition member. In the gas generator according to the present invention, when the second igniter is activated, the pressure rise in the second combustion chamber caused by the combustion of the second gas generating agent causes the peripheral At least one of the first gas passage hole and the second gas passage hole is opened by moving the cap member toward the top plate portion while keeping the plate portion in close contact with the partition wall member. The first combustion chamber and the second combustion chamber are communicated with each other by being exposed so as to face both the first combustion chamber and the second combustion chamber. Along with this, the gas generated in the second combustion chamber is introduced into the first combustion chamber.

In the gas generator based on the present invention, both the first gas passage hole and the second gas passage hole may be provided in the peripheral plate portion.

In the gas generator based on the present invention, a plurality of the first gas passage holes may be provided in a dotted line along the circumferential direction of the peripheral plate portion, and the second gas passage holes A plurality of holes may be provided in a dotted pattern along the circumferential direction of the peripheral plate portion.

In the gas generator according to the present invention, each of the plurality of second gas passage holes has a length along the axial direction of the peripheral plate portion that is greater than a length along the circumferential direction of the peripheral plate portion. It may have a long hole shape with a large diameter.

In the gas generator according to the present invention, the cap member may be inserted into an end portion of the partition wall member on the top plate portion side.

In the gas generator according to the present invention, the partition may further include a cover member attached to the end of the partition member on the top plate side, in which case The cover member includes a first cover portion covering the top plate portion, and the top plate portion of the partition member extends from the peripheral edge of the first cover portion along the axial direction of the partition member. It is preferable to have a cup-like shape including a second cover portion that is in close contact with the side portion. In this case, when the second igniter is activated, it is preferable that the cover member is pushed up by the cap member and moves toward the top plate portion, thereby separating from the partition member.

In the gas generator according to the present invention, the cap member may be loosely fitted to the partition member before the second igniter is activated. In this case, when the second igniter is activated, the cap member is deformed so that the peripheral plate portion expands due to the increase in pressure in the second combustion chamber. It is preferable that at least a part of the partition wall member is in close contact with the inner peripheral surface of the partition member along the circumferential direction.

In the gas generator according to the present invention, the cover member is fitted over the partition member so that the second cover portion is formed on the outer peripheral surface of the portion of the partition member near the top plate portion. may be in close contact with

In the gas generator according to the present invention, the cover member is inserted into the partition member so that the second cover portion is positioned on the inner circumference of the portion of the partition member near the top plate portion. It may adhere to the surface.

In the gas generator based on the present invention, both the first gas passage hole and the second gas passage hole may be provided in the partition member.

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

In the gas generator based on the present invention, when the first igniter is activated prior to the activation of the second igniter, the first combustion chamber is generated by burning the first gas generating agent. Due to the pressure increase, the top plate portion is deformed so as to swell outward, thereby increasing the distance between the top plate portion and the top plate portion. It is preferably configured to be included in the movement margin of the cap member when the two igniters are in operation.

In the gas generator according to the present invention, the cap member is inserted into the end portion of the partition wall member on the side of the top plate portion, so that the peripheral plate portion of the partition member It may be in close contact with the inner peripheral surface of the portion near the top plate portion.

In the gas generator according to the present invention, the cap member is externally inserted onto the end portion of the partition member on the top plate portion side, so that the peripheral plate portion of the partition member becomes the It may be in close contact with the outer peripheral surface of the portion near the top plate portion.

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

The gas generator according to the present invention may further include a holder fixed to the bottom plate portion and holding the second igniter. In this case, the partition member is press-fitted into the holder. preferably.

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 diagram of a disk-shaped gas generator according to Embodiment 1. FIG. FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. 1; FIG. 2 is an exploded perspective view showing an assembly structure of the partition shown in FIG. 1; FIG. 2 is a schematic diagram showing the first stage of operation of the disk-shaped gas generator shown in FIG. 1; FIG. 2 is a schematic diagram showing a second stage of operation of the disk-type gas generator shown in FIG. 1; FIG. 3 is a schematic diagram showing a third stage that can additionally occur during the operation of the disk-type gas generator shown in FIG. 1; 1. It is a perspective view which shows the 1st thru|or 3rd modification of the cap member shown in FIG. 4 is a schematic diagram of a disk-shaped gas generator according to Embodiment 2. FIG. FIG. 9 is a schematic diagram showing a second stage of operation of the disk-type gas generator shown in FIG. 8; 3 is a schematic diagram of a disk-shaped gas generator according to Embodiment 3. FIG. FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 4; FIG. 12 is an exploded perspective view showing an assembly structure of the partition shown in FIG. 11; FIG. 12 is a schematic diagram showing the first stage of operation of the disk-shaped gas generator shown in FIG. 11; FIG. 12 is a schematic diagram showing a second stage of operation of the disk-type gas generator shown in FIG. 11; FIG. 12 is a schematic diagram showing a third stage that can additionally occur during operation of the disk-shaped gas generator shown in FIG. 11; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 5; FIG. 17 is an exploded perspective view showing an assembly structure of the partition shown in FIG. 16; FIG. 17 is a schematic diagram showing the first stage of operation of the disk-shaped gas generator shown in FIG. 16; FIG. 17 is a schematic diagram showing a second stage of operation of the disk-type gas generator shown in FIG. 16; FIG. 17 is a schematic diagram showing a third stage that can additionally occur during operation of the disk-shaped gas generator shown in FIG. 16; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 6; FIG. 11 is a schematic diagram of a disk-shaped gas generator according to Embodiment 7; 1 is a schematic diagram of a disk-shaped gas generator according to a reference embodiment; FIG.

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

(Embodiment 1)
FIG. 1 is a schematic diagram of a disk-type gas generator according to Embodiment 1, and FIG. 2 is a schematic cross-sectional diagram taken along line II-II shown in FIG. 3 is an exploded perspective view showing an assembly structure of the partition 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 3. FIG.

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

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

The lower shell 10 and the upper shell 20 are each formed in a substantially cylindrical shape with a bottom, and a housing is constructed by combining and joining these opening surfaces facing each other. The lower shell 10 has a bottom plate portion 11 and a peripheral wall portion 12 , and the upper shell 20 has a top plate portion 21 , a peripheral wall portion 22 and a flange portion 23 .

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

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

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

At predetermined positions of the bottom plate portion 11 of the lower shell 10, a first opening portion 11a and a second opening portion 11b are provided. A first igniter assembly 30 is assembled to the bottom plate portion 11 of the lower shell 10 so as to close the first opening portion 11a, and a second igniter assembly 30 is assembled to close the second opening portion 11b. An assembly 40 is assembled. Here, the first opening portion 11a is a portion for exposing a first female connector portion (to be described later) provided at the lower end of the first igniter assembly 30 to the outside, and the second opening portion 11b is , a portion for exposing a second female connector portion, which will be described later, provided at the lower end of the second igniter assembly 40 to the outside.

The first igniter assembly 30 mainly includes a first holder 31 , a first igniter 32 , a first seal member 33 , a cup body 34 and a transfer charge 36 . The first holder 31 constitutes the base of the first igniter assembly 30. By assembling the first igniter 32, the cup body 34, etc. to the first holder 31, the first igniter Assembly 30 is constructed as an integral part.

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

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

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

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

Nichrome wire or the like is generally used as the resistor, and ZPP (zirconium/potassium perchlorate), ZWPP (zirconium/tungsten/potassium perchlorate), lead tricinate, or the like is generally used as the igniter. Note that the squib cups and emboli described above are generally made of metal or plastic.

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

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

Here, a first seal member 33 made of an O-ring or the like is interposed between the first holder 31 and the first igniter 32 , and thereby a seal between the first holder 31 and the first igniter 32 is provided. By closing the gap between them, the airtightness of the part is ensured. In addition, the fixing method of the 1st igniter 32 is not restricted to the fixing method using the crimping|crimped part 31d mentioned above, You may utilize another fixing method.

The cup body 34 has a cup-like shape with an open end on the bottom plate portion 11 side, and includes a transfer chamber 35 in which a transfer charge 36 is accommodated. The cup body 34 has a top wall portion 34a and a side wall portion 34b that define the transfer chamber 35, and a flange portion 34c that extends radially outward from the opening end side portion of the side wall portion 34b. there is

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

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

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

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

The transfer charge 36 filled in the transfer chamber 35 is ignited by the flame generated by the operation of the first igniter 32, and burns to generate thermal particles. The transfer charge 36 must be capable of reliably starting combustion of the first gas generating agent 51, and is generally B/KNO ₃ , B/NaNO ₃ , Sr(NO ₃ ). _2, etc., a composition consisting of metal powder/oxidizing agent, a composition consisting of titanium hydride/potassium perchlorate, a composition consisting of B/5-aminotetrazole/potassium nitrate/molybdenum trioxide, etc. are used. .

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

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

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

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

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

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

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

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

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

Here, a second seal member 43 made of an O-ring or the like is interposed between the second holder 41 and the second igniter 42 , thereby separating the second holder 41 and the second igniter 42 . By closing the gap between them, the airtightness of the part is ensured. In addition, the fixing method of the 2nd igniter 42 is not restricted to the fixing method using the crimping|crimped part 41d mentioned above, You may utilize another fixing method.

The partition part 44 has a partition member 45, a cover member 46, and a cap member 47. The partition member 45, the cover member 46, and the cap member 47 are combined to form a cup-like shape as a whole. is doing. The partition part 44 functions as a pressure partition that divides the space inside the housing and inside the filter 70 into two chambers.

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

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

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

As shown in FIGS. 1 and 3, the partition member 45 has a tubular shape with openings at both ends in the axial direction. The partition member 45 is arranged so that its axial direction is parallel to the axial direction of the housing. It functions as a fixed portion 45a.

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

The cover member 46 has a cup-like shape with an open end on the bottom plate portion 11 side, and is attached to the open end of the partition member 45 on the top plate portion 21 side. Like the partition member 45, the cover member 46 is made of a metal member such as stainless steel, iron steel, aluminum alloy, or stainless alloy.

The cover member 46 includes a disk-shaped first cover portion 46a that covers the top plate portion 47a of the cap member 47 described later, and a partition member that extends from the peripheral edge of the first cover portion 46a toward the bottom plate portion 11 side. A cylindrical second cover portion 46b that covers the outer peripheral surface of the portion of the top plate portion 21 side of the portion 45 is included. Among them, the first cover portion 46a covers the opening of the partition wall member 45 located on the top plate portion 21 side, thereby forming a closed end of the partition portion 44 together with the top plate portion 47a of the cap member 47, which will be described later.

The cover member 46 is attached to the partition member 45 by being fitted over the above-described open end of the partition member 45, and preferably fixed to the partition member 45 by press fitting. Thereby, the second cover portion 46b of the cover member 46 is in close contact with the outer peripheral surface of the partition member 45 described above. Here, the axial length of the second cover portion 46b provided on the cover member 46 can be configured to be relatively short, and is equal to the minimum required length for sealing the above-described open end of the partition member 45. can do.

The cap member 47 has a cup-like shape with an open end on the bottom plate portion 11 side, and is inserted into a portion of the partition member 45 near the top plate portion 21 . Thereby, the cap member 47 is accommodated in the space defined by the partition member 45 and the cover member 46 . Like the partition member 45, the cap member 47 is made of a metal member such as stainless steel, iron steel, aluminum alloy, or stainless alloy, but its thickness is sufficiently thinner than that of the partition member 45. be done.

The cap member 47 includes a disk-shaped top plate portion 47a that constitutes the closed end of the partition portion 44 by covering the opening of the partition member 45 located on the top plate portion 21 side, and the bottom plate portion 11 side from the peripheral edge of the top plate portion 47a. and a cylindrical peripheral plate portion 47b extending toward. Of these, the top plate portion 47a is arranged between the second gas generating agent 52 and the first cover portion 46a of the cover member 46, and closes the partition portion 44 together with the first cover portion 46a of the cover member 46 described above. make up the ends.

The cap member 47 is accommodated in the partition member 45 by being inserted into the above-described open end of the partition member 45. In the present embodiment, the cap member 47 is loosely fitted to the partition member 45. . Here, loose fitting means that the cap member 47 fitted into the partition member 45 has a predetermined clearance with the partition member 45. The diameter is slightly smaller than the inner diameter of the partition member 45 .

That is, in the present embodiment, the cap member 47 is not press-fitted into the partition member 45, and the peripheral plate portion 47b of the cap member 47 is in contact with the partition member 45 when the disk-type gas generator 1A is not in operation. is not in close contact with the inner peripheral surface of the As a result, in the present embodiment, the cap member 47 is assembled so as to be relatively movable and deformable with respect to the partition member 45, and during the combustion of the second gas generating agent 52, it will be described later. Movement and deformation of the cap member 47 will occur.

Here, when the cap member 47 is loosely fitted to the partition member 45 as described above, an effect of facilitating the press-fitting operation when press-fitting the partition member 45 into the second holder 41 is also obtained. That is, the assembling work of assembling the above-described partition portion 44 to the bottom plate portion 11 of the lower shell 10 via the second holder 41 is performed, for example, by loosely fitting the cap member 47 to the partition member 45 and generating the second gas. It is performed by filling the agent 52 , pressing it into the second holder 41 , and then pressing the cover member 46 into the partition member 45 . In this case, when the partition member 45 is press-fitted into the second holder 41, air is discharged to the outside through the clearance formed between the cap member 47 and the partition member 45. It will make your work easier. In order to facilitate the press-fitting operation of the cover member 46 into the partition member 45, for example, one hole is formed at a predetermined position of the cover member 46, and the air passes through the hole. should be discharged to However, in that case, the position where the hole is formed should be a position where the hole is closed by the partition member 45 or the cap member 47 when the press-fitting of the cover member 46 into the partition member 45 is completed. is.

A peripheral plate portion 47b of the cap member 47 is provided with a plurality of first gas passage holes 47c and a plurality of second gas passage holes 47d. The plurality of first gas passage holes 47c and the plurality of second gas passage holes 47d are both provided so as to pass through the peripheral plate portion 47b along the thickness direction of the peripheral plate portion 47b. The opening surface located outside faces the partition member 45 and is covered with the partition member 45 .

Here, the plurality of first gas passage holes 47c are provided in a dotted pattern along the circumferential direction of the peripheral plate portion 47b. It is provided in a dotted line along the direction. The plurality of first gas passage holes 47c are arranged closer to the top plate portion 21 (that is, the top plate portion 47a side) than the plurality of second gas passage holes 47d. is provided with two stages of gas passage hole groups.

The plurality of first gas passage holes 47c are for passing the gas generated in the second combustion chamber S2 toward the space outside the partition 44 when the second gas generating agent 52 is burned. . More specifically, these plurality of first gas passage holes 47c substantially increase the pressure in the second combustion chamber S2 particularly in the initial stage of combustion of the second gas generating agent 52, while the second gas generating agent 52 During combustion, the gas generated in the second combustion chamber S2 is passed toward the space outside the partition 44, the details of which will be described later.

The plurality of second gas passage holes 47d are used to allow the gas generated in the second combustion chamber S2 to pass toward the space outside the partition 44 as necessary during the combustion of the second gas generating agent 52. belongs to. More specifically, when the pressure in the second combustion chamber S2 becomes higher than necessary during the combustion of the second gas generating agent 52, the plurality of second gas passage holes 47d are closed. This is for passing the gas generated in S2 toward the space outside the partition section 44, the details of which will be described later.

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 and the partition portion 44 in advance to the second holder 41, is fixed to the lower shell 10. In particular, the second combustion chamber S2 provided inside the second igniter assembly 40 is arranged so as to protrude toward the space inside the housing. Electron beam welding, laser welding, friction welding, or the like can be suitably used to join the bottom plate portion 11 and the second holder 41 together.

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

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

As shown in FIGS. 1 and 2, the space inside the housing accommodates a filter 70 in addition to the first igniter assembly 30 and the second igniter assembly 40 described above. The filter 70 has a cylindrical shape and is arranged coaxially with the housing such that its central axis coincides with the central axis of the peripheral wall 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 that cools 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 discharged 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). By constructing in this way, it is possible to prevent the occurrence of dead space inside the housing, and to construct the disk-type gas generator 1A in a small size as a whole.

A first gas generating agent 51 is accommodated in the first combustion chamber S1. More specifically, the first gas generating agent 51 is contained in the space inside the filter 70 and adjacent to the top wall portion 34a and the side wall portion 34b of the cup body 34 of the first igniter assembly 30, and , the space inside the filter 70 and adjacent to the side wall portion of the partition portion 44 of the second igniter assembly 40 . The first gas generating agent 51 is a chemical that is ignited by hot particles generated by the operation of the first igniter 32 and burns to generate gas.

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

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

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

Additives include binders, slag forming agents, and combustion modifiers. As the binder, for example, organic binders such as polyvinyl alcohol, metal salts of carboxymethyl cellulose and stearates, and inorganic binders such as synthetic hydrotalcite and acid clay can be preferably used. In addition, binders include polysaccharide derivatives such as hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guar gum, polyvinylpyrrolidone, polyacrylamide, and starch. Alternatively, inorganic binders such as molybdenum disulfide, talc, bentonite, diatomaceous earth, kaolin, and alumina can also 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 . Thereby, the upper support member 62 is positioned between the top plate portion 21 and the first gas generating agent 51 in the vicinity of the end portion of the first combustion chamber S1.

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

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

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

If it is necessary to 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 top plate portion 47a of the cap member 47 and the second gas generating agent 52, or an annular disk-shaped cushioning material surrounds the second igniter 42. It can either be placed between the upper surface of the second holder 41 of the part and the second gas generant. 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. However, when adopting the former configuration, it is preferable to prevent the first gas passage hole 47c provided in the cap member 47 from being blocked by the cushioning material, for example, by making the cushioning material sufficiently thin. 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.

4 and 5 are schematic diagrams showing the first and second stages of operation of the disk-shaped gas generator according to this embodiment, respectively. FIG. 6 is a schematic diagram showing a third stage that can additionally occur during operation of the disk-type gas generator 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. 4 to 6. FIG.

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

As shown in FIG. 4, 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, and the ignition The ignition part 32b bursts due to the combustion of the gunpowder. As a result, the transfer charge 36 housed inside the cup body 34 is ignited and burned.

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

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

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 AR1).

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

At this time, 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 distances between the first cover portion 46a of the cover member 46 and the top plate portion 47a of the cap member 47 (that is, the closed end of the partition portion 44) and the top plate portion 21 are increased.

On the other hand, in the first stage, the cover member 46 is pressed against the partition member 45 due to the pressure increase in the first combustion chamber S1 caused by the combustion of the first gas generating agent 51. . Therefore, the opening of the partition member 45 on the top plate portion 21 side is closed by the first cover portion 46 a of the cover member 46 , and the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 is covered with the first cover member 46 . Since the second cover portion 46b is in close contact, the state in which the portion is covered is maintained.

As a result, in the first stage, the first combustion chamber S1 and the second combustion chamber S2 are not communicated with each other, and the second gas generating agent 52, which has not yet started to burn, is supplied with the first gas generating agent. 51 will no longer be affected.

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. 5, 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 this time, pressure is applied to the cap member 47 accommodated in the second combustion chamber S2 due to the pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52. The pressure acts on the top plate portion 47a of the cap member 47 mainly in the direction along the axial direction of the housing, and the pressure acts on the peripheral plate portion 47b of the cap member 47 in the direction mainly along the radial direction of the housing. The pressure acts on

As a result, the entire cap member 47 moves toward the top plate portion 21 of the upper shell 20, and the peripheral plate portion 47b deforms so as to expand radially outward. Become. Therefore, the cap member 47 moves toward the top plate portion 21 while the portion of the peripheral plate portion 47b near the lower end is kept in close contact with the inner peripheral surface of the partition member 45 along the circumferential direction.

Therefore, the portion of the peripheral plate portion 47b closer to the lower end is maintained in close contact with the inner peripheral surface of the partition member 45 along the circumferential direction, thereby preventing gas from leaking out from this portion. Therefore, the partition member 45 and the cap member 47 reliably form a pressure partition, and the internal pressure of the second combustion chamber S2 can be appropriately increased, and as a result, the combustion of the second gas generating agent 52 is interrupted. will continue without

Further, with the above-described movement of the cap member 47, the cover member 46 is pushed up by the cap member 47 and moves toward the top plate portion 21 side. As a result, the cap member 47 is separated from the open end of the partition member 45 on the top plate portion 21 side. Therefore, when the cover member 46 is separated from the partition member 45, the first gas passage hole 47c provided in the peripheral plate portion 47b of the cap member 47 is located at the position on the top plate portion 21 side of the partition member 45 for the first combustion. It is exposed so as to face the chamber S1.

Here, in the present embodiment, when the movement of the cover member 46 and the cap member 47 in the second stage occurs by a predetermined amount, the movement of the cover member 46 and the cap member 47 is caused by the top plate portion 21. configured to be restricted. That is, the cover member 46 contacts the top plate portion 21 via the upper support member 62, and the cap member 47 contacts the top plate portion 21 via the cover member 46 and the upper support member 62, thereby The cover member 46 and the cap member 47 will stop.

As a result, of the plurality of first gas passage holes 47c and the plurality of second gas passage holes 47d provided in the cap member 47, the plurality of first gas passage holes 47c located closer to the top plate portion 21 side are are exposed to face both the first combustion chamber S1 and the second combustion chamber S2, and the plurality of second gas passage holes 47d positioned closer to the bottom plate portion 11 are exposed to the second combustion chamber S1 and the second combustion chamber S2. Although it faces S2, it is covered with the partition member 45 so that it does not face the first combustion chamber S1.

Therefore, in the second stage, the first combustion chamber S1 and the second combustion chamber S2 are communicated with each other with a channel cross-sectional area corresponding to the total opening area of the plurality of first gas passage holes 47c. Therefore, by appropriately reducing the total opening area of the plurality of first gas passage holes 47c, it is possible to determine whether the surrounding environment of the disk-type gas generator 1A is in a low temperature environment, a normal temperature environment, or a high temperature environment. Also, the internal pressure of the second combustion chamber S2 rises appropriately, and as a result, the second gas generating agent 52 burns continuously.

As described above, as indicated by an arrow AR2 in the figure, the gas generated in the second combustion chamber S2 passes through the plurality of first gas passage holes 47c provided in the peripheral plate portion 47b, thereby causing the first It will be introduced into the combustion chamber S1. At this time, the traveling direction of the gas is changed by the cover member 46 detached from the partition member 45, and the gas is mainly blown out toward the bottom plate portion 11 side of the lower shell 10. As shown in FIG.

Therefore, in the disk-shaped gas generator 1A according to the present embodiment, when the gas generated in the second combustion chamber S2 is introduced into the first combustion chamber S1, it is directed directly toward the inner peripheral surface of the filter 70. will no longer be sprayed. Therefore, breakage of the filter 70 can be prevented.

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

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

Here, when the surrounding environment of the disk-type gas generator 1A is under a low temperature environment or a normal temperature environment, the first gas generating agent 51 and the second gas are supplied while maintaining the state of the second stage described above. Combustion of the generating agent 52 is completed, thereby completing the operation of the disk-type gas generator 1A.

On the other hand, when the surrounding environment of the disk-shaped gas generator 1A is in a high-temperature environment, the pressure rise in the second combustion chamber S2 may be excessively accelerated. There is a risk that the pressure in the combustion chamber S2 will rise more than necessary. In this respect, in the disk-shaped gas generator 1A according to the present embodiment, when the pressure in the second combustion chamber S2 is excessively increased, additional pressure is generated before the operation of the disk-shaped gas generator 1A is completed. After that, the operation of the disk-shaped gas generator 1A is completed.

As shown in FIG. 6, when the internal pressure of the second combustion chamber S2 rises excessively in the above-described second stage, the cap member 47 moves further toward the top plate portion 21 accordingly. As a result, the cap member 47 presses the top plate portion 21 through the cover member 46 and the upper support member 62, thereby deforming the top plate portion 21 further outward.

Along with this, not only the plurality of first gas passage holes 47c provided in the cap member 47 but also the plurality of second gas passage holes 47d face both the first combustion chamber S1 and the second combustion chamber S2. exposed. Therefore, in the third stage, the first combustion chamber S1 and the second combustion chamber S2 are divided into the total opening area of the plurality of first gas passage holes 47c and the total opening area of the plurality of second gas passage holes 47d. are communicated with a channel cross-sectional area corresponding to the total sum of

Therefore, in the third stage, the first combustion chamber S1 and the second combustion chamber S2 communicate with each other with a passage cross-sectional area larger than that in the second stage, and the pressure in the second combustion chamber S2 increases. Excessive rise can be prevented. Therefore, even when the surrounding environment of the disk-shaped gas generator 1A is in a high-temperature environment, the pressure in the second combustion chamber S2 increases more than necessary while continuously burning the second gas generating agent 52. It is possible to prevent this from happening.

As described above, as indicated by arrows AR2 and AR3 in the figure, the gas generated in the second combustion chamber S2 passes through the plurality of first gas passage holes 47c and the plurality of second gas passage holes 47c provided in the peripheral plate portion 47b. By passing through the second gas passage hole 47d, it is introduced into the first combustion chamber S1.

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

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

As described above, with the disk-shaped gas generator 1A according to the present embodiment, when it is operated in a low-temperature environment and a normal temperature environment, the above-described first stage and second stage are performed exclusively, and the When the operation of the disk-shaped gas generator 1A is completed and it operates in a high-temperature environment, the operation of the disk-shaped gas generator 1A is completed exclusively through the above-described first stage, second stage, and third stage. become.

Therefore, in the initial stage of combustion of the second gas generating agent 52, the pressure in the second combustion chamber S2 is considerably increased and The second gas generating agent 52 can be burned continuously, and even when the surrounding environment is in a high temperature environment, the pressure of the second combustion chamber S2 does not become higher than necessary, and the second gas generating agent 52 can be continuously burned. The gas generating agent 52 can be burned.

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 can be a disk-shaped gas generator 1A.

In general, in gas generators, due to unavoidable variations in the manufacturing conditions during the production of the gas generating agent and the unavoidable difference in filling conditions when filling the housing with the gas generating agent, There may be slight variations in gas output during operation between products. In this regard, with the disk-type gas generator 1A according to the present embodiment, it is possible to effectively suppress variations in gas output due to such causes. It is possible to reliably obtain the desired gas output at

Here, as described above, the gas generated in the second combustion chamber S2 passes through the plurality of first gas passage holes 47c provided in the peripheral plate portion 47b of the cap member 47 or, in addition, the plurality of second gas passage holes 47c. In order for the gas to be introduced into the first combustion chamber S1 by passing through the second gas passage hole 47d, the cover member 46 is separated from the partition member 45 as the second gas generating agent 52 is burned, while the cap member 47 is separated from the second gas generating agent 52. does not separate from the partition member 45 .

Further, as described above, particularly in the second stage, the gas generated in the second combustion chamber S2 and then introduced into the first combustion chamber S1 is jetted toward the bottom plate portion 11 side. , the plurality of first gas passage holes 47c must be positioned to face the cover member 46 after the movement of the cover member 46 and the cap member 47 is restricted by the top plate portion 21. become.

In order to satisfy these conditions, it is necessary to appropriately adjust the degree of movement and deformation of the cover member 46 and the cap member 47 described above. Here, the degree of movement and deformation of the cover member 46 and the cap member 47 described above is determined by the second igniter assembly 40 and the top plate portion 21 (more strictly speaking, the state before operation of the disk-type gas generator 1A). , the distance between the top plate portion 21 and the upper support member 62), the axial length of the second cover portion 46b of the cover member 46, the axial length of the peripheral plate portion 47b of the cap member 47 , the positions of the plurality of first gas passage holes 47c and the plurality of second gas passage holes 47d provided in the peripheral plate portion 47b of the cap member 47, the thickness of the housing (especially the top plate portion 21, the bottom plate portion 11, etc.) It is mainly determined by the shape, material, thickness, shape, material, etc. of the cover member 46 and the cap member 47, and in order to satisfy the above conditions, it is sufficient to specifically design them appropriately.

As described above, the first covering of the top plate portion 21 and the cover member 46 due to the deformation of the bottom plate portion 11 and the top plate portion 21 during the operation of the disk-type gas generator 1A is located in the movement margin of the cover member 46. Since the increment of the distance between the first cover portion 46a and the portion 46a is included, the first cover portion 46a is separated from the upper support member 62 attached to the top plate portion 21 before operation of the disk-type gas generator 1A. It may be positioned apart, or may be in contact with the upper support member 62 .

In addition, as described above, the cap member 47 moves with the top plate portion 21 and the top plate portion 47a of the cap member 47 due to the deformation of the bottom plate portion 11 and the top plate portion 21 during operation of the disk-type gas generator 1A. Since the increment of the distance between Alternatively, it may be in contact with the first cover portion 46a.

On the other hand, in the disk-shaped gas generator 1A according to the present embodiment, the second cover portion 46b of the cover member 46 is not provided with the gas passage holes, and the first gas generation in the first combustion chamber S1 is prevented. When the agent 51 is burned, it does not affect the second gas generating agent 52 accommodated in the second combustion chamber S2, which has not yet started burning, and the second gas generating agent in the second combustion chamber S2. 52, through the plurality of first gas passage holes 47c provided in the cap member 47 and the plurality of second gas passage holes 47d provided in the cap member 47 in addition to the first gas passage holes 47c and the second combustion chamber S2. It can be configured to communicate with the first combustion chamber S1.

Therefore, since the second cover portion 46b of the cover member 46 is not provided with gas passage holes, the length of the second cover portion 46b in the axial direction can be shortened. The press fit margin can be shortened. As a result, it is possible to prevent a large force from acting on the fixing portion 45a of the partition member 45 during combustion of the second gas generating agent 52, and consequently prevent the fixing portion 45a from being damaged. In addition, as the force required to move the cover member 46 becomes sufficiently small, variations in the force between products are less likely to occur, and as a result, a desired gas output can be stably obtained. be possible.

Therefore, by adopting the above configuration, the disk-type gas generator 1A having a dual structure can be obtained, in which a desired gas output can be stably obtained while ensuring higher reliability than the conventional one.

By adopting the configuration described above, when the gas generated in the second combustion chamber S2 is ejected into the first combustion chamber S1 through the plurality of first gas passage holes 47c, the cover member 46 is Since the direction of travel is changed by the collision, a secondary effect is obtained that the slag contained in the gas is effectively captured by the inner wall surface of the cover member 46 at the time of the collision. can also

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

Here, in the disk-type gas generator 1A according to the above-described present embodiment, the case where the cap member 47 is loosely fitted in the partition member 45 has been described as an example. It may be configured to be lightly press-fitted into the partition member 45 . Here, light press-fitting means that the cap member 47 fitted into the partition member 45 is not in pressure contact with the partition member 45 in a substantial sense. In other words, the outer diameter of the cap member 47 is approximately equal to the inner diameter of the partition wall member 45 .

(First to Third Modifications)
7A to 7C are perspective views showing first to third modifications of the cap member shown in FIG. 1, respectively. Next, with reference to FIG. 7, disk-shaped gas generators according to first to third modifications based on the first embodiment described above will be described.

In the first and second modifications, the positions and shapes of the plurality of second gas passage holes 47d provided in the cap member 47 are changed in the disk-shaped gas generator 1A of the first embodiment described above. The third modification is obtained by changing the number of stages of the gas passage hole groups provided in the cap member 47 in the disk-shaped gas generator 1A of the first embodiment described above.

That is, in the cap member 47 according to the first modified example shown in FIG. They are arranged so as not to overlap in the axial direction, so that the plurality of gas passage holes are arranged in a so-called zigzag pattern as a whole.

In addition, in a cap member 47 according to a second modification shown in FIG. 7B, a plurality of gas passage holes are arranged in a so-called zigzag pattern as a whole, and a plurality of second gas passage holes 47d among them are arranged in a zigzag pattern. , is formed in an elongated hole shape in which the length along the axial direction of the peripheral plate portion 47b is longer than the length along the circumferential direction of the peripheral plate portion 47b.

In addition, in the cap member 47 according to the third modification shown in FIG. 7C, the plurality of gas passage holes are arranged in a so-called zigzag pattern as a whole, while the plurality of second gas passage holes 47d A plurality of third gas passage holes 47e are further provided in a dotted line along the circumferential direction of the peripheral plate portion 47b at a position opposite to the side on which the top plate portion 47a is located. The number of steps of the gas passage hole groups provided is three steps.

Even when the cap member 47 is configured as shown in FIGS. 7(A) to 7(C), the same effects as those described in the first embodiment can be obtained. In particular, as shown in FIGS. 7(A) to 7(C), when a plurality of gas passage holes are arranged in a zigzag pattern as a whole, the groups of gas passage holes provided in a marked manner are brought closer to each other. 7(B) and 7(C). The flow channel cross-sectional area of the flow channel connecting S1 and the second combustion chamber S2 can be increased, and an excessive pressure rise in the second combustion chamber S2 can be suppressed more effectively.

(Embodiment 2)
FIG. 8 is a schematic diagram of a disk-shaped gas generator according to Embodiment 2, and FIG. 9 is a schematic diagram showing the second stage of operation of the disk-shaped gas generator. A disk-shaped gas generator 1B according to the present embodiment will be described below with reference to FIGS. 8 and 9. FIG.

As shown in FIG. 8, in the disk-shaped gas generator 1B according to the present embodiment, when compared with the disk-shaped gas generator 1A according to the first embodiment described above, the peripheral plate portion 47b of the cap member 47 is , in that a truncated conical swash plate portion 47b1 whose diameter increases toward the bottom plate portion 11 side is provided at the upper end portion of the peripheral plate portion 47b. Here, the plurality of first gas passage holes 47c are provided in a dotted line along the circumferential direction of the swash plate portion 47b1, and the plurality of second gas passage holes 47d are arranged on the swash plate portion 47b1. are provided in a line of dots along the circumferential direction on the portion of the peripheral plate portion 47b (ie, the cylindrical portion of the peripheral plate portion 47b) that does not correspond to .

With this configuration, as shown in FIG. 9, in the second stage when the second igniter 42 is activated, the plurality of first gas passage holes 47c provided in the swash plate portion 47b1 of the cap member 47 However, as compared with the case of the first embodiment described above, the state of facing the top plate portion 21 side more, and the gas ejected from the plurality of first gas passage holes 47c directly flows into the filter 70. Spraying toward the peripheral surface can be more reliably avoided, and although illustration thereof is omitted here, similarly, in the above-described third stage, the air is directly directed toward the inner peripheral surface of the filter 70 . It is possible to further avoid blowing gas. Therefore, damage to the filter 70 can be more reliably prevented, and slag can be trapped by the inner wall surface of the cover member 46 more effectively.

Therefore, by adopting the above configuration, not only can the same effect as in the first embodiment described above be obtained, but also higher reliability can be ensured, and a desired gas output can be obtained more stably. It can be a disk-type gas generator 1B with a structure.

(Embodiment 3)
FIG. 10 is a schematic diagram of a disk-shaped gas generator according to Embodiment 3. FIG. A disk-shaped gas generator 1C according to the present embodiment will be described below with reference to FIG.

As shown in FIG. 10, the disk-shaped gas generator 1C according to the present embodiment has a shape of the cover member 46 and a partition wall member 45 when compared with the disk-shaped gas generator 1A according to the first embodiment described above. The assembly structure for is different.

Specifically, the cover member 46 includes a disk-shaped first cover portion 46a that forms the closed end of the partition portion 44 by covering the opening of the partition member 45 located on the top plate portion 21 side, and the first cover portion 46a. A cylindrical second cover portion 46b that covers the inner peripheral surface of the portion of the partition member 45 near the top plate portion 21 by extending from the peripheral edge of the portion 46a toward the top plate portion 21; 2, an annular plate-shaped third cover portion 46c that covers the end portion of the partition member 45 on the top plate portion 21 side by extending radially outward from the tip portion in the axial direction of the cover portion 46b. I'm in.

The cover member 46 is assembled to the partition member 45 by being inserted into the open end of the partition member 45 located on the top plate portion 21 side, and is preferably fixed to the partition member 45 by press fitting. Thereby, the second cover portion 46b of the cover member 46 is in close contact with the inner peripheral surface of the partition member 45 described above. Here, the axial length of the second cover portion 46b provided on the cover member 46 can be configured to be relatively short, and is equal to the minimum required length for sealing the above-described open end of the partition member 45. can do.

The cap member 47 has the same configuration as that of the first embodiment described above, and is accommodated in the partition member 45 by being inserted into the above-described open end of the partition member 45 . Thereby, the cap member 47 is housed in a space defined by the partition wall member 45 and the cover member 46 , and the disk-shaped top plate portion 47 a of these is accommodated between the second gas generating agent 52 and the first gas generating agent 52 of the cover member 46 . It is arranged between the cover portion 46a. Also in this embodiment, the cap member 47 is loosely fitted to the partition member 45 .

Even when configured in this way, in the second stage when the second igniter 42 is activated, the pressure rise in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52 causes the second combustion. Pressure is applied to the cap member 47 accommodated in the chamber S2, and the cap member 47 is lifted upward while the peripheral plate portion 47b is in close contact with the inner peripheral surface of the partition member 45 along the peripheral direction. It moves toward the plate portion 21 side.

Accordingly, the cover member 46 is pushed up by the cap member 47 to move toward the top plate portion 21 side, and is separated from the open end of the partition member 45 on the top plate portion 21 side. As a result, the plurality of first gas passage holes 47c provided in the peripheral plate portion 47b of the cap member 47 or the plurality of second gas passage holes 47d in addition to the first gas passage holes 47c are located on the top plate portion 21 side of the partition member 45. In this position, it is exposed so as to face the first combustion chamber S1, and is exposed to the second combustion chamber S2 via the plurality of first gas passage holes 47c or, in addition, the plurality of second gas passage holes 47d. The gas generated at is jetted out into the first combustion chamber S1.

Therefore, since the second cover portion 46b of the cover member 46 is not provided with the gas passage hole, the press-fitting margin of the cover member 46 into the partition member 45 can be shortened, and as a result, the fixed portion 45a of the partition member 45 can be prevented from being damaged, and the occurrence of variations in gas output between products can be suppressed.

Therefore, even when the above configuration is adopted, the same effects as in the case of the first embodiment can be obtained.

(Embodiment 4)
FIG. 11 is a schematic diagram of a disk-type gas generator according to Embodiment 4, and FIG. 12 is an exploded perspective view showing the assembly structure of the partition shown in FIG. First, with reference to FIGS. 11 and 12, the configuration of a disk-shaped gas generator 1D according to this embodiment will be described.

As shown in FIGS. 11 and 12, in the disc-shaped gas generator 1D according to the present embodiment, when compared with the disc-shaped gas generator 1A according to the first embodiment described above, the partition portion 44 is the partition wall. The main difference is that it is composed only of the member 45 and the cap member 47 . That is, disk-type gas generator 1D according to the present embodiment has cover member 46 (see FIGS. ) is not provided. Also, the assembly structure of the cap member 47 to the partition member 45 in the disk-shaped gas generator 1D according to the present embodiment is different from that in the disk-shaped gas generator 1A according to the first embodiment.

The partition member 45 has a cylindrical shape with openings at both ends in the axial direction, and has a fixing portion 45 a at the end portion on the bottom plate portion 11 side. The fixing portion 45 a is press-fitted into the second holder 41 fixed to the bottom plate portion 11 , and thereby the partition portion 44 including the partition member 45 is assembled to the bottom plate portion 11 via the second holder 41 . .

The cap member 47 has a cup-like shape with an open end on the bottom plate portion 11 side, and is attached to a portion of the partition member 45 near the top plate portion 21 . The cap member 47 includes a disk-shaped top plate portion 47a that constitutes the closed end of the partition portion 44 by covering the opening of the partition member 45 located on the top plate portion 21 side, and the bottom plate portion 11 side from the peripheral edge of the top plate portion 47a. and a cylindrical peripheral plate portion 47b extending toward.

The cap member 47 is attached to the partition member 45 by being externally inserted into the open end of the partition member 45 on the top plate portion 21 side, and preferably fixed to the partition member 45 by press-fitting or light press-fitting. . Here, press-fitting means that the cap member 47 fitted into the partition member 45 is in pressure contact with the partition member 45 , so that there is no clearance between the partition member 45 and the cap member 47 . In other words, the inner diameter of the cap member 47 is smaller than the outer diameter of the partition member 45 before assembly. As a result, the peripheral plate portion 47b of the cap member 47 is in close contact with the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 .

A peripheral plate portion 47b of the cap member 47 is provided with a plurality of first gas passage holes 47c and a plurality of second gas passage holes 47d. The plurality of first gas passage holes 47c and the plurality of second gas passage holes 47d are both provided so as to pass through the peripheral plate portion 47b along the thickness direction of the peripheral plate portion 47b. The inner opening surface faces the partition member 45 and is covered with the partition member 45 .

Here, the plurality of first gas passage holes 47c are provided in a dotted pattern along the circumferential direction of the peripheral plate portion 47b. It is provided in a dotted line along the direction. The plurality of first gas passage holes 47c are arranged closer to the top plate portion 21 (that is, the top plate portion 47a side) than the plurality of second gas passage holes 47d. is provided with two stages of gas passage hole groups.

The plurality of first gas passage holes 47c are for passing the gas generated in the second combustion chamber S2 toward the space outside the partition 44 when the second gas generating agent 52 is burned. . More specifically, these plurality of first gas passage holes 47c substantially increase the pressure in the second combustion chamber S2 particularly in the initial stage of combustion of the second gas generating agent 52, while the second gas generating agent 52 This is for passing the gas generated in the second combustion chamber S2 toward the space outside the partition 44 during combustion.

The plurality of second gas passage holes 47d are used to allow the gas generated in the second combustion chamber S2 to pass toward the space outside the partition 44 as necessary during the combustion of the second gas generating agent 52. belongs to. More specifically, when the pressure in the second combustion chamber S2 becomes higher than necessary during the combustion of the second gas generating agent 52, the plurality of second gas passage holes 47d are closed. This is for allowing the gas generated in S2 to pass through toward the space outside the partition portion 44 .

13 and 14 are schematic diagrams respectively showing the first and second steps during the operation of the disk-shaped gas generator according to this embodiment. FIG. 15 is a schematic diagram showing a third stage that can additionally occur during operation of the disk-shaped gas generator according to this embodiment. Next, operation of the disk-shaped gas generator 1D according to the present embodiment will be described with reference to FIGS. 13 to 15. FIG.

As shown in FIG. 13, in the first stage when the first igniter 32 is activated, the transfer charge 36 is ignited by the first igniter 32 and burned, and a large amount of heat is generated by the combustion of the transfer charge 36. A large amount of gas is generated in the first combustion chamber S1 by sequentially igniting and burning the first gas generating agent 51 by the particles. The gas generated in the first combustion chamber S1 passes through the inside of the filter 70, is introduced into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24. (See arrow AR1).

In this first stage, the cap member 47 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 top plate portion 47 a of the cap member 47 , and the peripheral plate portion of the cap member 47 is formed on the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 . 47b are brought into close contact with each other, so that both the plurality of first gas passage holes 47c and the plurality of second gas passage holes 47d provided in the peripheral plate portion 47b are closed by the partition member 45. As shown in FIG.

As a result, in the first stage, the first combustion chamber S1 and the second combustion chamber S2 are not communicated with each other, and the second gas generating agent 52, which has not yet started to burn, is supplied with the first gas generating agent. 51 will no longer be affected.

As shown in FIG. 14, in the second stage in which the second igniter 42 is activated, the second gas generating agent 52 is sequentially ignited and burned by the second igniter 42, thereby causing the second combustion chamber S2 to A lot of gas is generated.

At this time, pressure is applied to the cap member 47 assembled to the partition member 45 due to the pressure rise in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, and the cap The member 47 as a whole moves toward the top plate portion 21 side of the upper shell 20 while keeping the peripheral plate portion 47 b in close contact with the outer peripheral surface of the partition member 45 . As the cap member 47 moves, the plurality of first gas passage holes 47c are exposed at positions on the top plate portion 21 side of the partition member 45 so as to face the second combustion chamber S2.

Here, in the present embodiment, when the movement of the cap member 47 in the second stage occurs by a predetermined amount, the movement of the cap member 47 is restricted by the top plate portion 21. . That is, the cap member 47 is stopped by contacting the top plate portion 21 via the upper support member 62 .

As a result, of the plurality of first gas passage holes 47c and the plurality of second gas passage holes 47d provided in the cap member 47, the plurality of first gas passage holes 47c located closer to the top plate portion 21 side are are exposed to face both the first combustion chamber S1 and the second combustion chamber S2. Although it faces S1, it is covered with the partition member 45 so that it does not face the second combustion chamber S2.

Therefore, in the second stage, the first combustion chamber S1 and the second combustion chamber S2 are communicated with each other with a channel cross-sectional area corresponding to the total opening area of the plurality of first gas passage holes 47c. Therefore, by appropriately narrowing the total opening area of the plurality of first gas passage holes 47c, it is possible to determine whether the surrounding environment of the disk-shaped gas generator 1D is in a low temperature environment, a normal temperature environment, or a high temperature environment. Also, the internal pressure of the second combustion chamber S2 rises appropriately, and as a result, the second gas generating agent 52 burns continuously.

As described above, as indicated by an arrow AR2 in the figure, the gas generated in the second combustion chamber S2 passes through the plurality of first gas passage holes 47c provided in the peripheral plate portion 47b, thereby causing the first It will be introduced into the combustion chamber S1. The gas introduced into the first combustion chamber S1 passes through the inside of the filter 70, is introduced into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24. (see arrow AR1).

Here, when the surrounding environment of the disk-shaped gas generator 1D is under a low-temperature environment or a normal-temperature environment, the first gas generating agent 51 and the second gas are supplied while maintaining the state of the second stage described above. Combustion of the generating agent 52 is completed, thereby completing the operation of the disk-type gas generator 1D.

On the other hand, if the surrounding environment of the disk-shaped gas generator 1D is in a high-temperature environment, the pressure rise in the second combustion chamber S2 may be excessively accelerated. Before the operation of 1 is completed, the operation of the disk-shaped gas generator 1D is completed after the transition to the third step, which will be described later.

As shown in FIG. 15, when the internal pressure of the second combustion chamber S2 rises excessively in the above-described second stage, the cap member 47 moves further toward the top plate portion 21 accordingly. As a result, the cap member 47 presses the top plate portion 21 via the upper support member 62 , thereby further deforming the top plate portion 21 outward.

Along with this, not only the plurality of first gas passage holes 47c provided in the cap member 47 but also the plurality of second gas passage holes 47d face both the first combustion chamber S1 and the second combustion chamber S2. exposed. Therefore, in the third stage, the first combustion chamber S1 and the second combustion chamber S2 are divided into the total opening area of the plurality of first gas passage holes 47c and the total opening area of the plurality of second gas passage holes 47d. are communicated with a channel cross-sectional area corresponding to the total sum of

Therefore, in the third stage, the first combustion chamber S1 and the second combustion chamber S2 communicate with each other with a passage cross-sectional area larger than that in the second stage, and the pressure in the second combustion chamber S2 increases. Excessive rise can be prevented. Therefore, even when the surrounding environment of the disk-shaped gas generator 1D is in a high-temperature environment, the pressure in the second combustion chamber S2 increases more than necessary while continuously burning the second gas generating agent 52. It is possible to prevent this from happening.

As described above, as indicated by arrows AR2 and AR3 in the figure, the gas generated in the second combustion chamber S2 passes through the plurality of first gas passage holes 47c and the plurality of second gas passage holes 47c provided in the peripheral plate portion 47b. By passing through the second gas passage hole 47d, it is introduced into the first combustion chamber S1. The gas introduced into the first combustion chamber S1 passes through the inside of the filter 70, is introduced into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24. (see arrow AR1).

As described above, with the disk-shaped gas generator 1D according to the present embodiment, when it is operated in a low-temperature environment and a normal temperature environment, the above-described first stage and second stage are performed exclusively. When the operation of the disk-shaped gas generator 1D is completed and it is operated in a high-temperature environment, the operation of the disk-shaped gas generator 1D is completed exclusively through the above-described first stage, second stage and third stage. become.

Therefore, even in the case of the disk-shaped gas generator 1D according to the present embodiment, substantially the same effects as those described in the above-described first embodiment can be obtained, and the influence of the difference in environmental temperature is possible. A disk-type gas generator 1D having a dual structure can be provided, which can reliably obtain a desired gas output during operation while eliminating as much as possible.

(Embodiment 5)
16 is a schematic diagram of a disk-type gas generator according to Embodiment 5, and FIG. 17 is an exploded perspective view showing an assembly structure of the partition shown in FIG. First, referring to FIGS. 16 and 17, the configuration of the disk-shaped gas generator 1E according to the present embodiment will be described.

As shown in FIGS. 16 and 17, the disk-shaped gas generator 1E according to the present embodiment is provided with gas passage holes when compared with the disk-shaped gas generator 1D according to the above-described fourth embodiment. The configuration is different in that the members are different.

The cap member 47 is attached to the partition member 45 by being externally inserted into the open end of the partition member 45 on the top plate portion 21 side, and preferably fixed to the partition member 45 by press-fitting or light press-fitting. . As a result, the peripheral plate portion 47b of the cap member 47 is in close contact with the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 . Note that the cap member 47 is not provided with a gas passage hole.

A plurality of first gas passage holes 45c and a plurality of second gas passage holes 45d are provided at the end portion of the partition member 45 near the top plate portion 21 . The plurality of first gas passage holes 45c and the plurality of second gas passage holes 45d are provided so as to penetrate the partition member 45 along the thickness direction of the partition member 45. The located opening surface is covered with the cap member 47 by facing the peripheral plate portion 47 b of the cap member 47 .

Here, the plurality of first gas passage holes 45c are provided in a dotted pattern along the circumferential direction of the partition member 45, and the plurality of second gas passage holes 45d are also provided in the circumferential direction of the partition member 45. are arranged in a dotted line along the line. The plurality of first gas passage holes 45c are arranged closer to the top plate portion 21 than the plurality of second gas passage holes 45d. is provided.

The plurality of first gas passage holes 45c are used to allow the gas generated in the second combustion chamber S2 to pass toward the space outside the partition 44 as necessary during the combustion of the second gas generating agent 52. belongs to. More specifically, when the pressure in the second combustion chamber S2 becomes higher than necessary during the combustion of the second gas generating agent 52, the plurality of first gas passage holes 45c are closed in the second combustion chamber S2. This is for allowing the gas generated in S2 to pass through toward the space outside the partition portion 44 .

The plurality of second gas passage holes 45d are for passing the gas generated in the second combustion chamber S2 toward the space outside the partition 44 when the second gas generating agent 52 is burned. . More specifically, the plurality of second gas passage holes 45d substantially increase the pressure in the second combustion chamber S2 particularly in the initial stage of combustion of the second gas generating agent 52, while increasing the pressure of the second gas generating agent 52. This is for passing the gas generated in the second combustion chamber S2 toward the space outside the partition 44 during combustion.

18 and 19 are schematic diagrams respectively showing the first and second steps during the operation of the disk-shaped gas generator according to this embodiment. FIG. 20 is a schematic diagram showing a third stage that can additionally occur during operation of the disk-type gas generator according to this embodiment. Next, operation of the disk-shaped gas generator 1E according to the present embodiment will be described with reference to FIGS. 18 to 20. FIG.

As shown in FIG. 18, in the first stage when the first igniter 32 is activated, the transfer charge 36 is ignited by the first igniter 32 and burned, and a large amount of heat is generated by the combustion of the transfer charge 36. A large amount of gas is generated in the first combustion chamber S1 by sequentially igniting and burning the first gas generating agent 51 by the particles. The gas generated in the first combustion chamber S1 passes through the inside of the filter 70, is introduced into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24. (See arrow AR1).

In this first stage, the cap member 47 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 top plate portion 47 a of the cap member 47 , and the peripheral plate portion of the cap member 47 is formed on the outer peripheral surface of the portion of the partition member 45 near the top plate portion 21 . 47b are brought into close contact with each other, so that both the plurality of first gas passage holes 45c and the plurality of second gas passage holes 45d provided in the partition member 45 are closed by the cap member 47. As shown in FIG.

As a result, in the first stage, the first combustion chamber S1 and the second combustion chamber S2 are not communicated with each other, and the second gas generating agent 52, which has not yet started to burn, is supplied with the first gas generating agent. 51 will no longer be affected.

As shown in FIG. 19, in the second stage in which the second igniter 42 is activated, the second gas generating agent 52 is sequentially ignited by the second igniter 42 and burned, resulting in the second combustion chamber S2. A lot of gas is generated.

At this time, pressure is applied to the cap member 47 assembled to the partition member 45 due to the pressure rise in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, and the cap The member 47 as a whole moves toward the top plate portion 21 side of the upper shell 20 while keeping the peripheral plate portion 47 b in close contact with the outer peripheral surface of the partition member 45 . As the cap member 47 moves, the plurality of second gas passage holes 45d are exposed to face the first combustion chamber S1.

Here, in the present embodiment, when the movement of the cap member 47 in the second stage occurs by a predetermined amount, the movement of the cap member 47 is restricted by the top plate portion 21. . That is, the cap member 47 is stopped by contacting the top plate portion 21 via the upper support member 62 .

As a result, of the plurality of first gas passage holes 45c and the plurality of second gas passage holes 45d provided in the partition member 45, only the plurality of second gas passage holes 45d located closer to the bottom plate portion 11 side are opened. are exposed to face both the first combustion chamber S1 and the second combustion chamber S2. Although it faces S2, it is covered with the cap member 47 so that it does not face the first combustion chamber S1.

Therefore, in the second stage, the first combustion chamber S1 and the second combustion chamber S2 are communicated with each other with a channel cross-sectional area corresponding to the total opening area of the plurality of second gas passage holes 45d. Therefore, by appropriately narrowing the total opening area of the plurality of second gas passage holes 45d, it is possible to determine whether the surrounding environment of the disk-type gas generator 1E is in a low temperature environment, a normal temperature environment, or a high temperature environment. Also, the internal pressure of the second combustion chamber S2 rises appropriately, and as a result, the second gas generating agent 52 burns continuously.

As described above, the gas generated in the second combustion chamber S2 passes through the plurality of second gas passage holes 45d provided in the partition member 45, as indicated by the arrow AR2 in the drawing. It will be introduced into the chamber S1. The gas introduced into the first combustion chamber S1 passes through the inside of the filter 70, is introduced into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24. (see arrow AR1).

Here, when the surrounding environment of the disk-shaped gas generator 1E is under a low temperature environment or a normal temperature environment, the first gas generating agent 51 and the second gas are maintained while maintaining the state of the second stage described above. Combustion of the generating agent 52 is completed, thereby completing the operation of the disk-type gas generator 1E.

On the other hand, if the surrounding environment of the disk-shaped gas generator 1E is in a high-temperature environment, the pressure rise in the second combustion chamber S2 may be excessively accelerated. Before the operation of (1) is completed, the operation of the disk-shaped gas generator 1E is completed after the transition to the third step, which will be described later.

As shown in FIG. 20, when the internal pressure of the second combustion chamber S2 rises excessively in the above-described second stage, the cap member 47 moves further toward the top plate portion 21 accordingly. As a result, the cap member 47 presses the top plate portion 21 via the upper support member 62 , thereby further deforming the top plate portion 21 outward.

Along with this, not only the plurality of second gas passage holes 45d provided in the partition member 45 but also the plurality of first gas passage holes 45c face both the first combustion chamber S1 and the second combustion chamber S2. exposed. Therefore, in the third stage, the first combustion chamber S1 and the second combustion chamber S2 are divided into the total opening area of the plurality of second gas passage holes 45d and the total opening area of the plurality of first gas passage holes 45c. are communicated with a channel cross-sectional area corresponding to the total sum of

Therefore, in the third stage, the first combustion chamber S1 and the second combustion chamber S2 communicate with each other with a passage cross-sectional area larger than that in the second stage, and the pressure in the second combustion chamber S2 increases. Excessive rise can be prevented. Therefore, even when the surrounding environment of the disk-shaped gas generator 1E is in a high-temperature environment, the pressure in the second combustion chamber S2 increases more than necessary while continuously burning the second gas generating agent 52. It is possible to prevent this from happening.

As described above, as indicated by arrows AR2 and AR3 in the figure, the gas generated in the second combustion chamber S2 passes through the plurality of second gas passage holes 45d provided in the partition member 45 and the plurality of first gas passage holes 45d. By passing through the gas passage hole 45c, the gas is introduced into the first combustion chamber S1. The gas introduced into the first combustion chamber S1 passes through the inside of the filter 70, is introduced into the gas discharge chamber S3, and is then jetted out of the housing through the plurality of gas jet ports 24. (see arrow AR1).

As described above, with the disk-shaped gas generator 1E according to the present embodiment, when it is operated in a low-temperature environment and a normal temperature environment, the above-described first stage and second stage are performed exclusively. When the operation of the disk-shaped gas generator 1E is completed and it operates in a high-temperature environment, the operation of the disk-shaped gas generator 1E is completed exclusively through the above-described first stage, second stage, and third stage. become.

Therefore, even in the case of the disk-shaped gas generator 1E according to the present embodiment, substantially the same effect as the effect described in the fourth embodiment can be obtained, and the influence of the difference in the environmental temperature can be suppressed. A dual-structured disk-type gas generator 1E that can reliably obtain a desired gas output during operation while eliminating as much as possible can be provided.

(Embodiment 6)
FIG. 21 is a schematic diagram of a disk-type gas generator according to Embodiment 6. FIG. A disk-type gas generator 1F according to the present embodiment will be described below with reference to FIG.

As shown in FIG. 21, the disk-shaped gas generator 1F according to the present embodiment has a larger assembly of the cap member 47 to the partition member 45 than the disk-shaped gas generator 1D according to the fourth embodiment described above. The attached structure is different. Specifically, the cap member 47 is assembled to the partition member 45 by being inserted into the open end of the partition member 45 on the side of the top plate 21 , and is preferably press-fitted or lightly press-fitted into the partition member 45 . fixed by As a result, the peripheral plate portion 47b of the cap member 47 is in close contact with the inner peripheral surface of the portion of the partition member 45 near the top plate portion 21 .

Here, the peripheral plate portion 47b of the cap member 47 is provided with a plurality of first gas passage holes 47c and a plurality of second gas passage holes 47d, as in the case of the fourth embodiment described above. . The plurality of first gas passage holes 47 c and the plurality of second gas passage holes 47 d are covered with the partition member 45 by facing the partition member 45 at their outer opening surfaces.

Even in the case of such a configuration, although the detailed description of the operation is omitted here, the operation according to the above-described fourth embodiment can be realized, and the influence of the difference in the environmental temperature can be reduced. A dual-structured disk-type gas generator 1F that can reliably obtain a desired gas output at the time of operation while eliminating as much as possible can be provided.

(Embodiment 7)
FIG. 22 is a schematic diagram of a disk-type gas generator according to Embodiment 7. FIG. A disk-shaped gas generator 1G according to the present embodiment will be described below with reference to FIG.

As shown in FIG. 22, the disk-shaped gas generator 1G according to the present embodiment has a larger assembly of the cap member 47 to the partition member 45 than the disk-shaped gas generator 1E according to the fifth embodiment described above. The attached structure is different. Specifically, the cap member 47 is assembled to the partition member 45 by being inserted into the open end of the partition member 45 on the side of the top plate 21 , and is preferably press-fitted or lightly press-fitted into the partition member 45 . fixed by As a result, the peripheral plate portion 47b of the cap member 47 is in close contact with the inner peripheral surface of the portion of the partition member 45 near the top plate portion 21 .

Here, the partition member 45 is provided with a plurality of first gas passage holes 45c and a plurality of second gas passage holes 45d, as in the fifth embodiment described above. The plurality of first gas passage holes 45c and the plurality of second gas passage holes 45d are covered by the cap member 47 by facing the peripheral plate portion 47b of the cap member 47 at the inner opening surfaces thereof. It is

Even in the case of such a configuration, although the detailed description of the operation is omitted here, the operation according to the above-described fifth embodiment can be realized, and the influence of the difference in the environmental temperature can be reduced. A dual-structured disk-type gas generator 1G that can reliably obtain a desired gas output during operation while eliminating as much as possible can be provided.

(Reference form)
FIG. 23 is a schematic diagram of a disk-shaped gas generator according to the reference embodiment. Hereinafter, a disk-shaped gas generator 1H according to the reference embodiment will be described with reference to FIG.

As shown in FIG. 23, the disk-shaped gas generator 1H according to the reference embodiment differs from the disk-shaped gas generator 1D according to the above-described fourth embodiment in the shape of the cap member 47 . Specifically, the cap member 47 is provided with only a single-stage gas passage hole group consisting of only the plurality of first gas passage holes 47c, and the plurality of first gas passage holes 47c are provided. The peripheral plate portion 47b of the cap member 47 is configured to have a significantly short axial length.

In the disk-shaped gas generator 1H according to the reference embodiment configured as described above, during its operation, substantially the same operations as those in the first stage and the second stage described in the fourth embodiment are performed. . On the other hand, if the pressure increase in the second combustion chamber S2 is excessively accelerated in the second stage, the cap member 47 is separated from the partition wall member 45 in the third stage. With the separation of , the first combustion chamber S1 and the second combustion chamber S2 communicate with each other with a larger flow passage cross-sectional area than in the second stage.

Therefore, even when configured in this manner, the disk-type gas generator 1H having a dual structure can obtain a desired gas output during operation while eliminating the influence of the difference in environmental temperature as much as possible. can.

(Other forms, etc.)
In the above-described first and second embodiments of the present invention and their modifications, in the second stage in which the second igniter is activated, the state after movement of the cover member and the cap member is restricted by the top plate portion. , the case where the plurality of first gas passage holes are configured to face the cover member has been described as an example, but this configuration is not necessarily required. Alternatively, the plurality of first gas passage holes may be configured so as not to face the cover member.

Further, in the above-described first to seventh embodiments of the present invention and their modifications, the explanation will be made by exemplifying the case where the gas passage hole group provided in a plurality of stages is provided only in one of the cap member and the partition wall member. However, some of the steps of the gas passage hole group provided over the plurality of steps may be provided in the cap member, and the remaining steps may be provided in the partition member. Even in such a case, the gas passage hole groups provided over a plurality of stages are configured to be opened in stages according to the amount of movement of the cap member, thereby eliminating the influence of differences in environmental temperature as much as possible. In addition, a dual-structure disk-type gas generator capable of obtaining a desired gas output at the time of operation can be provided.

Further, in the above-described first to seventh embodiments of the present invention and their modified examples and reference embodiments, the first igniter and the second igniter are energized at different timings, thereby causing the second igniter to perform the first ignition. The explanation has been given by exemplifying the case where it is configured to operate at a timing delayed from the operation timing of the device, but it is configured to operate at the same timing by energizing them at the same timing. may be Further, even when the first igniter and the second igniter are energized at the same timing, by providing a delay charge for delaying the ignition of the ignition charge in the ignition part of the second igniter, the second igniter The time required from the energization of the igniter to the ignition of the ignition charge is extended, thereby energizing the first igniter and the second igniter at the same timing, while setting the timing of the start of combustion of the second gas generating agent to the first It may be configured to delay the timing of starting combustion of the gas generating agent.

In addition, in the above-described first to seventh embodiments and their modifications and reference embodiments, the second combustion chamber is filled with only the gas generating agent. In addition to the gas generating agent, a transfer charge may also be accommodated.

In addition, in the first to seventh embodiments of the present invention and their modifications and reference forms described above, the first igniter and the second igniter are placed on the bottom plate of the housing via the metal first and second holders, respectively. Although the explanation has been made by exemplifying the case where the first igniter and the second igniter are assembled to the bottom plate of the housing by so-called insert molding. . In that case, the disk-shaped gas generator will have a first holding part and a second holding part made of resin molded parts instead of the above-described first holder and second holder, and the first igniter and The second igniter is assembled to the bottom plate portion of the housing through the first holding portion and the second holding portion, respectively.

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

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

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

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

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

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

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

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

Here, as the adhesive to be applied to the bottom plate in advance, one containing a resin material having excellent heat resistance, durability, corrosion resistance, etc. after curing as a raw material is preferably used. For example, a cyanoacrylate resin or a silicone-based resin as a raw material is particularly preferably used. In addition to the above resin materials, phenolic resins, epoxy resins, melamine resins, urea resins, polyester resins, alkyd resins, polyurethane resins, polyimide resins, polyethylene resins, polypropylene resins, Polyvinyl chloride resin, polystyrene resin, polyvinyl acetate resin, polytetrafluoroethylene resin, acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, acrylic resin, polyamide resin, polyacetal resin, polycarbonate resin, Polyphenylene ether resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyolefin resin, polyphenylene sulfide resin, polysulfone resin, polyether sulfone resin, polyarylate resin, polyether ether ketone resin , polyamideimide-based resin, liquid crystal polymer, styrene-based rubber, olefin-based rubber, etc. as raw materials can be used as the above-mentioned adhesive.

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

Furthermore, the characteristic configurations shown in the above-described Embodiments 1 to 7 and their modifications and reference forms can be combined with each other without departing from the gist of the present disclosure.

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

1A to 1H disk type gas generator, 10 lower shell, 11 bottom plate, 11a first opening, 11b second opening, 12 peripheral wall, 20 upper shell, 21 top plate, 22 peripheral wall, 23 flange Part 24 Gas ejection port 25 Seal tape 30 First igniter assembly 31 First holder 31a Upper concave portion 31b Lower concave portion 31c Through hole 31d, 31e Crimped portion 32 First igniter 32a base portion 32b ignition portion 32c terminal pin 33 first seal member 34 cup body 34a top wall portion 34b side wall portion 34c flange portion 35 transfer chamber 36 transfer charge 40 second igniter assembly, 41 second holder, 41a upper concave portion, 41b lower concave portion, 41c through hole, 41d caulking portion, 42 second igniter, 42a base portion, 42b ignition portion, 42c terminal pin, 43 second sealing member, 44 partition portion, 45 Partition member 45a Fixed portion 45c First gas passage hole 45d Second gas passage hole 46 Cover member 46a First cover portion 46b Second cover portion 46c Third cover portion 47 Cap member 47a Top plate portion , 47b peripheral plate portion, 47b1 swash plate portion, 47c first gas passage hole, 47d second gas passage hole, 47e third gas passage hole, 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 (8)

a housing including a peripheral wall portion provided with a gas ejection port, a top plate portion closing one axial end of the peripheral wall portion, and a bottom plate portion closing the other axial end of the peripheral wall portion;
a cylindrical filter housed inside the housing such that the outer peripheral surface faces the inner peripheral surface of the peripheral wall;
It has a cup-like shape as a whole having a closed end on the top plate portion side, and is assembled to the bottom plate portion so that the space inside the filter is a first combustion chamber in which a first gas generating agent is accommodated. and a partition section for partitioning into a second combustion chamber containing the second gas generating agent;
a first igniter assembled to the bottom plate so as to face the first combustion chamber, which is a space outside the partition;
a second igniter assembled to the bottom plate so as to face the second combustion chamber, which is a space inside the partition;
The partition portion includes a cylindrical partition member having openings at both ends in the axial direction and fixed to the bottom plate portion, and an end portion of the partition member on the top plate portion side inserted into the partition member. a cap member that constitutes the closed end when assembled ; and a cover member that is assembled to the end of the partition wall member on the top plate portion side ,
The cap member includes a top plate portion that forms the closed end by covering the opening of the partition wall member located on the top plate portion side, and extends from the peripheral edge of the top plate portion along the axial direction of the partition member. By forming a cup-shaped shape including a peripheral plate portion facing the partition member,
The cover member includes a first cover portion that covers the top plate portion, and a cover member that extends from the peripheral edge of the first cover portion along the axial direction of the partition member, thereby covering the top plate portion of the partition member. Forming a cup-shaped shape including a second cover part that is in close contact with the part of
A first gas passage hole is provided in one of the peripheral plate portion and the partition member,
the first gas passage hole is covered by the one of the peripheral plate portion and the partition wall member that is not provided with the first gas passage hole;
A second gas passage hole is provided in either one of the peripheral plate portion and the partition member,
the second gas passage hole is covered by the one of the peripheral plate portion and the partition wall member that is not provided with the second gas passage hole;
The first gas passage hole is positioned closer to the top plate portion than the second gas passage hole in the axial direction of the partition member,
At the time of operation of the second igniter, due to a pressure increase in the second combustion chamber caused by combustion of the second gas generating agent, the peripheral plate portion is in a state of being in close contact with the partition member. When the cap member moves toward the top plate portion, the cover member is pushed up by the cap member and moves toward the top plate portion side, thereby separating from the partition member. By exposing at least one of the first gas passage hole and the second gas passage hole so as to face both the first combustion chamber and the second combustion chamber, the first combustion chamber and the second combustion chamber are exposed. A gas generator in which the chambers communicate with each other so that the gas generated in the second combustion chamber is introduced into the first combustion chamber. 2. The gas generator according to claim 1, wherein said first gas passage hole and said second gas passage hole are both provided in said peripheral plate portion. A plurality of the first gas passage holes are provided in a dotted pattern along the circumferential direction of the peripheral plate,
3. The gas generator according to claim 2, wherein a plurality of said second gas passage holes are provided in a line of dots along the circumferential direction of said peripheral plate portion. Each of the plurality of second gas passage holes has an elongated hole shape whose length along the axial direction of the peripheral plate portion is greater than the length along the circumferential direction of the peripheral plate portion. 3. The gas generator according to 3. The cap member is loosely fitted to the partition member in a state before the second igniter is activated,
At the time of operation of the second igniter, due to the pressure increase in the second combustion chamber, the cap member is deformed so that the peripheral plate portion expands, so that at least a part of the peripheral plate portion 5. The gas generator according to any one of claims 1 to 4 , wherein the gas generator is in close contact with the inner peripheral surface of the partition member along the circumferential direction. The gas generator according to any one of claims 1 to 5 , wherein movement of said cap member during operation of said second igniter is restricted by said top plate portion. During the actuation of the first igniter prior to the actuation of the second igniter, due to the pressure increase in the first combustion chamber caused by the combustion of the first gas generating agent, the top plate portion is positioned outside. By deforming so as to swell toward , the distance between the top plate portion and the top plate portion increases, and the increase in this distance is the amount of movement of the cap member when the second igniter is activated. 7. The gas generator of claim 6 , configured to be included in a. a housing including a peripheral wall portion provided with a gas ejection port, a top plate portion closing one axial end of the peripheral wall portion, and a bottom plate portion closing the other axial end of the peripheral wall portion;
a cylindrical filter housed inside the housing such that the outer peripheral surface faces the inner peripheral surface of the peripheral wall;
It has a cup-like shape as a whole having a closed end on the top plate portion side, and is assembled to the bottom plate portion so that the space inside the filter is a first combustion chamber in which a first gas generating agent is accommodated. and a partition section for partitioning into a second combustion chamber containing the second gas generating agent;
a first igniter assembled to the bottom plate so as to face the first combustion chamber, which is a space outside the partition;
a second igniter assembled to the bottom plate so as to face the second combustion chamber, which is a space inside the partition;
The partition section includes a cylindrical partition member having openings at both ends in the axial direction and fixed to the bottom plate, and a cap member that is assembled to the partition member to form the closed end. ,
The cap member includes a top plate portion that forms the closed end by covering the opening of the partition wall member located on the top plate portion side, and extends from the peripheral edge of the top plate portion along the axial direction of the partition member. By forming a cup-shaped shape including a peripheral plate portion facing the partition member,
The circumferential plate portion is provided with a plurality of first gas passage holes arranged in a dotted line along the circumferential direction of the circumferential plate portion, and a plurality of first gas passage holes arranged in a dotted line along the circumferential direction of the circumferential plate portion. 2 gas passage holes are provided,
The plurality of first gas passage holes and the plurality of second gas passage holes are covered with the partition member,
The first gas passage hole is positioned closer to the top plate portion than the second gas passage hole in the axial direction of the partition member,
each of the plurality of second gas passage holes has an elongated hole shape whose length along the axial direction of the peripheral plate portion is greater than the length along the circumferential direction of the peripheral plate portion;
At the time of operation of the second igniter, due to a pressure increase in the second combustion chamber caused by combustion of the second gas generating agent, the peripheral plate portion is in a state of being in close contact with the partition member. At least one of the first gas passage hole and the second gas passage hole moves toward both the first combustion chamber and the second combustion chamber by moving the cap member toward the top plate portion. The first combustion chamber and the second combustion chamber are communicated by being exposed facing each other, and accordingly, the gas generated in the second combustion chamber is introduced into the first combustion chamber. generator.

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