JP2020157879A - Gas generator - Google Patents

Abstract

To provide a dual-structural gas generator in which an assembly operation is facilitated.SOLUTION: A gas generator 1 comprises a partition part 44 partitioning an inside space of a filter 70 into first and second combustion chambers S1 and S2. The partition part 44 has a cup-shaped partition wall member 45 including a block part 45a and a cylindrical part 45b, and a nearly cylindrical cover member 46 in which a cut 46a is provided on a part in a circumferential direction. The cover member 46 is installed to the partition wall member 45 to pressure-contact with the cylindrical part 45b by application to an outside surface of the cylindrical part 45b and thereby, a gas passage hole 45c provided on the cylindrical part 45b is closed. During an operation of a second igniter 42, the cover member 46 deforms resulting from pressure rise of the second combustion chamber S2 by combustion of a second gas generating agent 52, and then closure of the gas passage hole 45c is released. Based on this, a gas generated in the second combustion chamber S2 passes through the gas passage hole 45c to be introduced into the first combustion chamber S1.SELECTED DRAWING: Figure 1

Description

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

Conventionally, from the viewpoint of protecting occupants of automobiles and the like, airbag devices, which are occupant protection devices, have become widespread. The airbag device is equipped for the purpose of protecting the occupant from the impact generated in the event of a vehicle collision. By instantly inflating and deploying the airbag in the event of a vehicle collision, the airbag acts as a cushion for the occupant. It catches the body.

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

There are various types of gas generators, but as a gas generator that is particularly preferably incorporated into a driver's side airbag device, a passenger's side airbag device, etc., a short abbreviation with a relatively large outer diameter. There is a columnar disc type gas generator. This disc-type gas generator also has various structures, and one of them is a dual-structure disc-type gas generator.

The dual structure disc type gas generator divides the combustion chamber formed inside the tubular filter installed inside the housing into two chambers, and fills each of the two chambers with a gas generator, and further. Two igniters are provided corresponding to these two chambers, and usually one igniter is configured to operate later than the other igniter. This dual-structured disc-type gas generator can maintain the desired gas output for a long period of time compared to a single-structured disc-type gas generator equipped with only a single combustion chamber and a single igniter. It is possible to obtain more suitable gas output characteristics by deploying the bag.

In the dual structure disc type gas generator, a pressure bulkhead is provided inside a housing provided with a gas outlet in order to divide the combustion chamber into two chambers. This pressure bulkhead is generally composed of a cup-shaped member, and in that case, the space outside the pressure bulkhead is the first gas generating agent in which combustion is started first. It is defined as a combustion chamber, and the space inside the pressure bulkhead is defined as a second combustion chamber in which a second gas generating agent, which starts combustion with a delay, is housed.

Here, the tubular 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, the gas passage hole is formed in the first gas generating agent contained in the second combustion chamber in which combustion has not yet started at the time of combustion of the first gas generating agent in the first combustion chamber. It needs to be sealed so that the combustion of the gas generating agent does not affect it.

Therefore, in some types of dual-structured disk-type gas generators, the pressure partition is attached to a cup member including a closed end and a cup-shaped fragile cover member attached to the cup member so as to cover the closed end. By providing a gas passage hole in the peripheral wall of the cup member, the gas passage hole is blocked by the cover member during combustion of the first gas generator, and the second gas generator At the time of combustion, the pressure generated by the combustion of the second gas generator causes the cover member of the portion covering the gas passage hole to be cleaved so that the second combustion chamber and the first combustion chamber communicate with each other. It is configured in.

Further, in another kind of dual structure disk type gas generator, the pressure partition is provided with a cup member including a closed end and a tubular member to which the cup member is relatively movable. By dividing the gas passage holes into members and providing gas passage holes in the peripheral wall of the cup member, the gas passage holes are blocked by the tubular member during combustion of the first gas generator, and the gas passage holes are blocked by the tubular member during combustion of the second gas generator. In the case where the cup member moves relative to the tubular member due to the pressure generated by the combustion of the second gas generating agent, the gas passage hole is exposed and the second combustion chamber and the first combustion chamber Is configured to communicate.

As a document in which a dual-structured disc-type gas generator having the former configuration is disclosed, for example, Japanese Patent Application Laid-Open No. 2007-131077 (Patent Document 1) is provided, and a dual-structured disc-type gas generator having the latter configuration is disclosed. Is disclosed in Japanese Patent Application Laid-Open No. 2009-517263 (Patent Document 2).

Japanese Unexamined Patent Publication No. 2007-13107 Special Table 2009-517263

Here, usually, the pressure bulkhead composed of the above-mentioned two members is performed by press-fitting one member into the other member from the viewpoint of facilitating the assembly work and reducing the number of parts. However, since the disc-type gas generator disclosed in Patent Documents 1 and 2 has a configuration in which the cylindrical peripheral wall of one member is press-fitted into the cylindrical peripheral wall of the other member, the above two members It is necessary to strictly control the dimensional accuracy of the above, and it cannot be said that the assembly work has been sufficiently facilitated.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a gas generator having a dual structure in which the assembly work is facilitated as compared with the conventional case.

The gas generator based on the present invention includes a housing, a filter, a partition, a first igniter, and a second igniter. The housing includes a peripheral wall portion provided with a gas outlet, a top plate portion that closes one end of the peripheral wall portion in the axial direction, and a bottom plate portion that closes the other end of the peripheral wall portion in the axial direction. .. The filter is composed of a tubular member housed inside the housing so that its outer peripheral surface faces the inner peripheral surface of the peripheral wall portion. The partition portion has a cup-like shape as a whole having a closed end on the top plate portion side, and by being assembled to the bottom plate portion, the space inside the filter is created by the first gas generating agent. It is divided into a first combustion chamber in which the gas is housed and a second combustion chamber in which the second gas generating agent is housed. The first igniter is assembled 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 assembled to the bottom plate portion so as to face the second combustion chamber, which is a space inside the partition portion. The partition portion includes a cup-shaped partition wall member including a closed portion forming the closed end by being located on the top plate side and a tubular portion facing the inner peripheral surface of the filter, and a pair of axial ends. It has a substantially tubular cover member having a shape in which a part in the circumferential direction is interrupted by providing a cut so as to reach both of the portions. The cover member is assembled to the partition wall member so as to be in pressure contact with the tubular portion by being addressed to the outer surface of the tubular portion. The tubular portion is provided with a gas passage hole for passing the gas generated in the second combustion chamber toward the first combustion chamber, and the gas passage hole is closed by the cover member. Has been done. In the gas generator based on the present invention, the cover member is caused by the pressure increase in the second combustion chamber caused by the combustion of the second gas generator during the operation of the second igniter. Is deformed to release the closure of the gas passage hole by the cover member. Along with this, the gas generated in the second combustion chamber is introduced into the first combustion chamber by passing through the gas passage hole.

In the gas generator based on the present invention, the filter may be arranged coaxially with the housing so that the central axis of the filter overlaps the central axis of the peripheral wall portion. The partition portion may be eccentrically arranged with respect to the housing so that the central axis of the partition wall member does not overlap with the central axis of the peripheral wall portion. In that case, it is preferable that the portion of the cover member provided with the cut is arranged at a position closest to the central axis of the peripheral wall portion, and the gas passage hole is tubular. It is preferable that the portion is provided only in the vicinity of the portion corresponding to the above-mentioned cut.

In the gas generator based on the present invention, a plurality of the gas passage holes may be provided in a dotted line along the circumferential direction of the tubular portion.

According to the present invention, it is possible to obtain a gas generator having a dual structure in which the assembly work is facilitated as compared with the conventional case.

It is a schematic sectional view of the disk type gas generator which concerns on embodiment. It is a schematic cross-sectional view along the line II-II shown in FIG. It is an exploded perspective view which shows the assembly structure of the partition part shown in FIG. It is a schematic cross-sectional view which shows the 1st stage in operation of the disk type gas generator shown in FIG. It is a schematic cross-sectional view which shows the 2nd stage at the time of operation of the disk type gas generator shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are applications of the present invention to a dual-structured disc-type gas generator that is suitably incorporated into an airbag device mounted on a steering wheel of an automobile or the like. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated.

FIG. 1 is a schematic cross-sectional view of the disc-type gas generator according to the embodiment, and FIG. 2 is a schematic cross-sectional view taken along the line II-II shown in FIG. Further, FIG. 3 is an exploded perspective view showing an assembled structure of the partition portion shown in FIG. 1. First, the configuration of the disc-type gas generator 1 according to the present embodiment will be described with reference to FIGS. 1 to 3.

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

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

The lower shell 10 and the upper shell 20 are each formed in a substantially cylindrical shape with a bottom, and the housing is formed by combining and joining these opening surfaces so as to face 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 to each other at or near their contact portions, whereby the lower shell 10 and the upper shell 20 are fixed. ing. Here, electron beam welding, laser welding, friction welding and the like can be preferably 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 composed of 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 on the upper side. It is composed of a peripheral wall portion 22 of the shell 20. Further, one end and the other end of the housing in the axial direction (that is, the axial direction of the peripheral wall portions 12 and 22) are closed by the bottom plate portion 11 of the lower shell 10 and the top plate portion 21 of the upper shell 20, respectively.

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

A first opening 11a and a second opening 11b are provided at predetermined positions of the bottom plate portion 11 of the lower shell 10. 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 11a, and a second igniter is attached so as to close the second opening 11b. The assembly 40 is assembled. Here, the first opening 11a is a portion for exposing the first female connector portion, which will be described later, provided at the lower end of the first igniter assembly 30 to the outside, and the second opening 11b is , A portion for exposing the 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 gunpowder 36. The first holder 31 constitutes the base of the first igniter assembly 30, and by assembling the first igniter 32, the cup body 34, and the like to the first holder 31, the first igniter assembly The solid 30 is configured as an integral part.

The first holder 31 is made of a member having a substantially columnar outer shape, and is made of a metal member such as stainless steel, steel, or an aluminum alloy. An upper recess 31a is provided on the upper surface of the first holder 31 located on the top plate portion 21 side, and a lower recess 31b is provided on the lower surface of the first holder 31 located on the bottom plate portion 11 side. There is. Further, the first holder 31 of the portion forming the bottom of the upper recess 31a and the bottom of the lower recess 31b is provided with a through hole 31c so as to reach the upper recess 31a and the lower recess 31b.

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

The first igniter 32 is for generating a flame, and is made of a pyrotechnic product generally called a squib. The first igniter 32 has a base portion 32a, an ignition portion 32b, and a pair of terminal pins 32c. The base portion 32a is a portion that holds the ignition portion 32b and the pair of terminal pins 32c, and is also a portion that is fixed to the first holder 31. The ignition unit 32b includes an igniting agent that ignites and burns during operation to generate a flame, and a resistor (bridge wire) for igniting the igniting agent. The pair of terminal pins 32c are connected to the ignition unit 32b to ignite the ignition charge.

More specifically, the base portion 32a and the ignition portion 32b include a squib cup formed in a cup shape and an embolus that closes the open end of the squib cup and a pair of terminal pins 32c is inserted and held therein. The above-mentioned resistor is attached so as to connect the tips of the pair of terminal pins 32c inserted in the squib cup, and the resistor is placed in the squib cup so as to surround or approach the resistor. It has a configuration loaded with an igniter.

Here, nichrome wire or the like is generally used as the resistor, and ZPP (zirconium / potassium perchlorate), ZWPP (zirconium / tungsten / potassium perchlorate), lead styphnate or the like is generally used as the ignition agent. The squib cup and embolus described above are generally made of metal or plastic.

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

In the first igniter 32, a 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 and fastened in the upper recess 31a of the first holder 31. The caulked portion 31d described above is fixed to the first holder 31 by being bent.

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

The cup body 34 has a cup-like shape in which the end portion on the bottom plate portion 11 side is open, and includes a fire transmission chamber 35 in which the fire spread agent 36 is housed. The cup body 34 has a top wall portion 34a and a side wall portion 34b that define the fire transmission chamber 35, and a flange portion 34c that extends radially outward from a portion of the side wall portion 34b on the opening end side. There is.

The cup body 34 is assembled to the first holder 31 so that the fire transmission chamber 35 formed inside the cup body 34 faces the ignition portion 32b of the first igniter 32, and more specifically, the flange portion 34c is attached. The caulked portion 31e described above is bent to be fixed to the first holder 31 in a state of being attached to the upper surface of the first holder 31.

The cup body 34 does not have an opening in either the top wall portion 34a or the side wall portion 34b, and surrounds the fire transmission room 35 provided inside the cup body 34. When the igniter 36 is ignited by the operation of the first igniter 32, the cup body 34 bursts or melts due to the pressure rise in the fire transmission room 35 and the conduction of the generated heat. Those with relatively low mechanical strength are used.

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

In addition to such a cup body 34, the cup body 34 is made of a metal member having high mechanical strength such as iron or copper, and has an opening on the side wall portion thereof. It is also possible to use one provided with a sealing member so as to close it. In this case, the combustion of the explosive charge 36 causes the sealing member to be cleaved or melted, thereby opening the above-mentioned opening. Here, as the above-mentioned sealing member, 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 to the cup body so as to close the opening. Etc. can be used. As the sealing tape, for example, an aluminum foil having an adhesive member coated on one side can be preferably used, and as the ring-shaped sealing body, an aluminum press-molded product including a thin plate tubular portion for closing the above-mentioned opening or the like can be preferably used. Can be preferably used. Further, the fixing method of the cup body 34 is not limited to the fixing method using the crimped portion 31e described above, and other fixing methods may be used.

The explosive charge 36 filled in the fire transmission room 35 is ignited by a flame generated by the operation of the first igniter 32, and burns to generate heat particles. The igniter 36 needs to 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 ). _A composition composed of a metal powder / oxidizing agent typified by ₂ or the like, a composition composed of titanium hydride / potassium perchlorate, a composition composed of B / 5-aminotetrazole / potassium nitrate / molybdenum trioxide, etc. are used. ..

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

The lower end of the first holder 31 is inserted from above into the first opening 11a provided in the bottom plate portion 11 of the lower shell 10, and the outer peripheral edge thereof is fixed by being joined to the bottom plate portion 11. ing. As a result, the first igniter assembly 30 integrated by assembling the first igniter 32 and the cup body 34 to the first holder 31 is fixed to the lower shell 10. Become.

Therefore, the first holder 31 is configured to be positioned so as to project from the bottom plate portion 11 toward the space inside the housing, and in particular, the fire transmission room provided inside the first igniter assembly 30. 35 will be placed in the space inside the housing. Here, electron beam welding, laser welding, friction welding, and the like can be preferably used for joining the bottom plate portion 11 and the first holder 31.

A pair of terminal pins 32c of the first igniter 32 are exposed and located in the lower recess 31b of the first holder 31. As a result, the lower concave portion 31b and the pair of terminal pins 32c form the above-mentioned 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 toward 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, and by assembling the second igniter 42, the partition portion 44, and the like to the second holder 41, the second igniter assembly The solid 40 is configured as an integral part.

The second holder 41 is made of a member having a substantially columnar outer shape, and is made of a metal member such as stainless steel, steel, or an aluminum alloy. An upper recess 41a is provided on the upper surface of the second holder 41 located on the top plate portion 21 side, and a lower recess 41b is provided on the lower surface of the second holder 41 located on the bottom plate portion 11 side. There is. Further, the second holder 41 of the portion forming the bottom of the upper recess 41a and the bottom of the lower recess 41b is provided with a through hole 41c so as to reach the upper recess 41a and the lower recess 41b.

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

The second igniter 42 is for generating a flame, and like the first igniter 32 described above, is made of a pyrotechnic product generally called a squib. The second igniter 42 has a base portion 42a, an ignition portion 42b, and a pair of terminal pins 42c. The base portion 42a is a portion that holds the ignition portion 42b and the pair of terminal pins 42c, and is also a portion that is fixed to the second holder 41. The ignition unit 42b includes an ignition agent that ignites and burns during operation to generate a flame, and a resistor (bridge wire) for igniting the ignition agent. The pair of terminal pins 42c are connected to the ignition unit 42b to ignite the ignition charge.

Since the second igniter 42 basically has the same configuration as the first igniter 32 described above, detailed description thereof will be omitted here.

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

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

As shown in FIGS. 1 and 2, the partition portion 44 has a partition wall member 45 and a cover member 46, and the partition wall member 45 and the cover member 46 are combined to form a cup-shaped shape as a whole. are doing. The partition 44 functions as a pressure bulkhead that divides the space inside the housing and the space inside the filter 70 into two chambers.

The space inside the housing and inside the filter 70 is partitioned by a 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.

The partition portion 44 is assembled to the second holder 41 so that the second combustion chamber S2 formed inside the partition portion 44 faces the ignition portion 42b of the second igniter 42. More specifically, as will be described later, the fixed portion 45b1 provided at the lower end of the partition wall member 45 of the partition portion 44 is press-fitted into the second holder 41, so that the partition portion 44 presses the second holder 41. It is assembled to the bottom plate portion 11 via.

The second gas generating agent 52 is housed in the second combustion chamber S2 located inside the partition portion 44. The second gas generating agent 52 is an agent that generates gas by being ignited by heat particles generated by the operation of the second igniter 42 and burning. The details of the second gas generating agent 52 will be described later.

As shown in FIGS. 1 to 3, the partition wall member 45 has a cup-like shape in which the end on the bottom plate portion 11 side is open, and is made of a metal such as stainless steel, steel, aluminum alloy, or stainless alloy. It is composed of the members of. The partition wall member 45 has a substantially disk-shaped closing portion 45a that constitutes a closing end of the partition portion 44 by being located on the top plate portion 21 side, and a substantially cylindrical tubular portion 45b that faces the inner peripheral surface of the filter 70. And have. The tubular portion 45b extends from the peripheral edge of the closing portion 45a toward the bottom plate portion 11 side along the axial direction of the partition wall member 45.

The partition wall member 45 is assembled to the bottom plate portion 11 by inserting the opening end provided at the lower end thereof into the second holder 41. More specifically, the lower end of the tubular portion 45b of the partition member 45 functions as a fixed portion 45b1 fixed to the second holder 41, and more specifically, the fixed portion 45b1 is the second holder. By press-fitting into 41, the partition member 45 is fixed to the second holder 41 and is assembled to the bottom plate portion 11. The method of fixing the partition wall member 45 is not limited to the above-mentioned fixing method, and other fixing methods (for example, a method of directly fixing to the bottom plate portion 11 by welding) may be used.

A plurality of gas passage holes 45c are provided in the tubular portion 45b of the partition member 45. The plurality of gas passage holes 45c are for passing the gas generated in the second combustion chamber S2 toward the first combustion chamber S1. The plurality of gas passage holes 45c are provided in a row of dots along the circumferential direction of the partition wall member 45, and each of them penetrates the tubular portion 45b along the thickness direction of the tubular portion 45b. It is provided. In the present embodiment, a plurality of gas passage holes 45c are provided so as to be unevenly distributed in the circumferential direction of the partition wall member 45, but this point will be described in detail later.

The cover member 46 has a substantially tubular shape having a shape in which a part in the circumferential direction is interrupted by providing a cut 46a so as to reach both of the pair of axial ends thereof. For example, stainless steel. It is composed of metal members such as steel, aluminum alloy, and stainless alloy. As described above, in the present embodiment, since the cover member 46 is composed of a curved plate-shaped member having a C-shaped cross section orthogonal to the axial direction of the partition wall member 45, a cut is made in the circumferential direction. It is composed of a member that is more likely to be elastically deformed in the radial direction when compared with a tubular member that does not have one.

The cover member 46 is assembled by press-fitting into the partition wall member 45, whereby the cover member 46 is addressed to the outer surface of the tubular portion 45b of the partition wall member 45. It is in pressure contact with 45b. The pressure contact with the tubular portion 45b is realized by the elastic force of the cover member 46.

The cover member 46 is assembled to the partition wall member 45 so as to cover a plurality of gas passage holes 45c provided in the tubular portion 45b of the partition wall member 45. As a result, the plurality of gas passage holes 45c are all closed by the cover member 46.

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 is inserted with respect to the bottom plate portion 11. It is fixed by being joined. As a result, the second igniter assembly 40 integrated by assembling the second igniter 42, the partition portion 44, and the like to the second holder 41 is fixed to the lower shell 10. Become.

Therefore, the second holder 41 is configured to be positioned so as to project from the bottom plate portion 11 toward the space inside the housing, and in particular, the second combustion provided inside the second igniter assembly 40. The chamber S2 will be arranged in the space inside the housing. Here, electron beam welding, laser welding, friction welding, and the like can be preferably used for joining the bottom plate portion 11 and the second holder 41.

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

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 toward the outside of the housing, and the male connector described above 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 so that its central axis coincides with the central axis of the peripheral wall portion of the housing. As a result, the outer peripheral surface of the filter 70 faces the inner peripheral surface of the peripheral wall portion of the housing.

The filter 70 surrounds the first igniter assembly 30 and the second igniter assembly 40 so that the first igniter assembly 30 and the second igniter assembly 40 are arranged in the space inside the filter 70. Is located in. As a result, the first combustion chamber S1 in which the first gas generating agent 51 is housed is formed in the space inside the filter 70 and in the space outside the partition portion 44. The filter 70 is arranged at a predetermined distance from the peripheral wall portion of the housing, whereby a gas discharge chamber S3 is formed between the peripheral wall portion of the housing and the filter 70.

As the filter 70, for example, one obtained by winding and sintering a metal wire such as stainless steel or steel, or one in which a net material woven with a metal wire is pressed and compacted can be used. As the net material, specifically, a knitted wire net, a plain weave wire net, an aggregate of crimp-woven metal wire, and the like can be used.

Further, as the filter 70, a filter 70 obtained by winding a perforated metal plate or the like can also be used. In this case, as the perforated metal plate, for example, an expanded metal in which a staggered cut is made in the metal plate and the metal plate is expanded to form a hole and processed into a mesh shape, or an expanded metal in which a hole is made in the metal plate and at that time. Hook metal or the like flattened by crushing burrs generated on the periphery of the hole is used. In this case, the size and shape of the holes to be formed can be appropriately 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 preferably used, and a non-ferrous metal plate such as aluminum, copper, titanium, nickel or an alloy thereof can also be used.

The filter 70 functions as a cooling means for cooling the gas by taking away the high-temperature heat of the gas when the gas generated in the first combustion chamber S1 and the second combustion chamber S2 passes through the filter 70. At the same time, it also functions as a removing means for removing residues (slag) and the like contained in the gas. Therefore, in order to sufficiently cool the gas and prevent the residue from being released to the outside, the gas generated in the first combustion chamber S1 and the second combustion chamber S2 is configured to surely pass through the filter 70. It is necessary to do.

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

The first gas generating agent 51 is housed in the first combustion chamber S1. More specifically, the first gas generating agent 51 is a space inside the filter 70 and adjacent to the top wall portion 34a and the side wall portion 34b of the cup body 34 of the first igniter assembly 30, and the space. , And is arranged in a space inside the filter 70 and adjacent to the tubular portion 45b of the partition member 45 of the second igniter assembly 40. The first gas generating agent 51 is an agent that generates gas by being ignited by heat particles generated by the operation of the first igniter 32 and burning.

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

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

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

Examples of the additive include a binder, a slag forming agent, a combustion adjusting agent, and the like. As the binder, for example, an organic binder such as polyvinyl alcohol, a metal salt of carboxymethyl cellulose, or stearate, or an inorganic binder such as synthetic hydrotalcite or acidic clay can be preferably used. In addition, as binders, polysaccharide derivatives such as hydroxyethyl cellulose, hydroxypropylmethyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guagam, polyvinylpyrrolidone, polyacrylamide, and starch are used. Alternatively, inorganic binders such as molybdenum disulfide, starch, bentonite, silica soil, kaolin, and alumina can also be preferably used. As the slag forming agent, silicon nitride, silica, acidic white clay and the like can be preferably used. As the combustion modifier, metal oxides, ferrosilicon, activated carbon, graphite and the like can be preferably used.

There are various shapes of the molded body of the gas generating agent, such as granular ones such as granules, pellets, and cylinders, and discs. Further, in the columnar shape, a perforated (for example, single-hole tubular shape, perforated tubular shape, etc.) molded body having a through hole inside the molded body is also used. These shapes are preferably selected as appropriate according to the specifications of the airbag device in which the disc-type gas generator 1 is incorporated. For example, a shape in which the gas generation rate changes with time when the gas generator is burned. It is preferable to select the optimum shape according to the specifications, such as selection. Further, it is preferable to appropriately select the size and filling amount of the molded product in consideration of the linear combustion rate of the gas generating agent, the pressure index, and the like in addition to the shape of the gas generating agent.

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

A plurality of gas outlets 24 are provided on the peripheral wall portion 22 of the upper shell 20 of the portion facing the filter 70 so as to face the gas discharge chamber S3. The plurality of gas outlets 24 are for leading the gas that has passed through the filter 70 to the outside of the housing via the gas discharge chamber S3.

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

As shown in FIG. 1, a lower support member 61 is arranged at an end of the first combustion chamber S1 located on the bottom plate portion 11 side. The lower support member 61 has an annular shape, and is arranged so as to cover the boundary portion between the filter 70 and the bottom plate portion 11 so as to cover the filter 70 and the bottom plate portion 11. As a result, the lower support member 61 is located 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 the gas generated in the first combustion chamber S1 and the second combustion chamber S2 passes through the inside of the filter 70 during operation. It also functions as an outflow prevention means for preventing outflow from the gap between the lower end of the filter 70 and the bottom plate portion 11. The lower support member 61 is formed by, for example, pressing a metal plate-shaped member, and is preferably made of a steel plate such as ordinary steel or special steel (for example, a cold-rolled steel plate or a stainless steel plate). It is composed of members.

An upper support member 62 is arranged at an end of the first combustion chamber S1 located on the top plate portion 21 side. The upper support member 62 has a substantially disk-like shape, and is arranged so as to cover the boundary portion between the filter 70 and the top plate portion 21 so as to be addressed to the filter 70 and the top plate portion 21. There is. As a result, the upper support member 62 is located 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 the gas generated in the first combustion chamber S1 and the second combustion chamber S2 does not pass through the inside of the filter 70 during operation. It also functions as an outflow prevention means for preventing outflow from the gap between the upper end of the filter 70 and the top plate portion 21. Similar to the lower support member 61 described above, the upper support member 62 is formed by, for example, pressing a metal plate-shaped member, and is preferably a steel plate such as ordinary steel or special steel (for example,). It is composed of members made of cold-rolled steel sheets, stainless steel sheets, etc.).

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

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

If some measures are required to prevent the second gas generating agent 52 from being crushed due to vibration, this can be realized by using a cushion material as in the case of the first gas generating agent 51. In that case, a disk-shaped cushion material is placed between the closed end located on the top plate portion 21 side of the partition portion 44 and the second gas generating agent 52, or a ring plate-shaped cushion material is provided. It can be either arranged between the upper surface of the second holder 41 of the portion surrounding the second igniter 42 and the second gas generating agent 52.

When the former configuration is adopted, the second gas generating agent 52 is pressed toward the bottom plate portion 11 side by the cushion material, and when the latter configuration is adopted, the second gas is pressed by the cushion material. The generating agent 52 is pressed toward the top plate portion 21 side. In addition, both the former configuration and the latter configuration may be adopted. Here, as the cushioning material for pressing the second gas generating agent 52 described above, the same material as the cushioning material 63 for pressing the first gas generating agent 51 can be used.

4 and 5 are schematic cross-sectional views showing the first and second stages of the operation of the disc type gas generator according to the present embodiment, respectively. Next, the operation of the disc type gas generator 1 according to the present embodiment will be described with reference to FIGS. 4 and 5.

When a vehicle equipped with the disc type gas generator 1 collides, the collision is detected by a collision detection means separately provided in the vehicle, and based on this, electricity is received from a control unit separately provided in the vehicle. First, the first igniter 32 operates.

As shown in FIG. 4, in the first stage in which the first igniter 32 is operated, the igniter filled in the ignition portion 32b of the first igniter 32 is ignited by being heated by the resistor, and the point is ignited. The ignition unit 32b bursts when the explosive burns. As a result, the propellant 36 contained inside the cup body 34 is ignited and burned.

When the fire-transmitting agent 36 burns, a large amount of heat particles are generated inside the fire-transmitting room 35, and the temperature and pressure of the fire-burning room 35 rise, so that the cup body 34 made of a fragile member bursts or melts. .. When the cup body 34 bursts or melts, a large amount of the above-mentioned heat particles flow into the portion of the first combustion chamber S1 in which the first gas generating agent 51 is housed.

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

At this time, the sealing tape 25 that has closed the plurality of gas outlets 24 is cleaved due to the pressure increase inside the housing caused by the combustion of the first gas generating agent 51. As a result, the gas generated in the first combustion chamber S1 is started to be ejected toward the outside of the housing through the plurality of gas outlets 24 (see arrow AR1).

In this first stage, the gas ejected from the plurality of gas outlets 24 to the outside of the disc-type gas generator 1 is introduced into the inside of the airbag provided adjacent to the disc-type gas generator 1. The airbag is inflated and deployed.

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 moved to the outside. It deforms so that it swells toward you.

On the other hand, in this first stage, the cover member 46 is pressed against the partition wall 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 tubular portion 45b of the partition wall member 45 is covered with the cover member 46 and is in close contact with the cover member 46.

As a result, the state in which the plurality of gas passage holes 45c provided in the tubular portion 45b of the partition wall member 45 are all closed by the cover member 46 is maintained. Therefore, in the first stage, the first combustion chamber S1 and the second combustion chamber S2 are not in a state of communication with each other, and the first gas generating agent 51 is connected to the second gas generating agent 52 whose combustion has not yet started. No longer affected by combustion.

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

In the second stage in which the second igniter 42 is activated, the igniter filled in the ignition portion 42b of the second igniter 42 is ignited by being heated by the resistor, and the igniter is ignited by burning. Part 42b bursts. As a result, the second gas generating agent 52 housed in the second combustion chamber S2 is sequentially ignited to start combustion.

Here, prior to the start of combustion of the second gas generator 52, the first gas generator 51 was ignited in advance and burned, so that the disk type gas generator 1 as a whole was already heated to a high temperature. Since it is in the state, the combustion of the second gas generating agent 52 can be started smoothly without providing the ignition agent between the ignition unit 42b and the second gas generating agent 52, and the second gas generating agent 52 is generated. Combustion of the agent 52 is less likely to be interrupted.

At that time, due to the pressure increase in the second combustion chamber S2 caused by the combustion of the second gas generating agent 52, the pressure in the second combustion chamber S2 is applied to the cover member 46 through the gas passage hole 45c. Will be done. As a result, as shown in FIG. 5, when the internal pressure of the second combustion chamber S2 increases to some extent, the cover member 46 is deformed against the elastic force of the cover member 46, and the cover member 46 is deformed. Is deformed so as to expand outward (that is, is displaced toward the first combustion chamber S1 side).

Due to the deformation of the cover member 46, the closure of the plurality of gas passage holes 45c is released, and in the second stage, the first combustion chamber S1 and the second combustion chamber S2 pass a plurality of gases. It is in a state of communicating through the hole 45c. Along with this, the gas generated in the second combustion chamber S2 passes through the plurality of gas passage holes 45c and is introduced into the first combustion chamber S1 (see arrow AR2).

Here, as long as the cover member 46 is deformed at an appropriate timing in the second stage to release the closure of the plurality of gas passage holes 45c, the deformed cover member 46 is fixed to the partition wall member 45. It may be left as it is, or it may fall off from the partition member 45. Whether or not the cover member 46 falls off from the partition wall member 45 depends on the ease of deformation of the cover member 46 (including elastic deformation and plastic deformation), the pressure of the gas ejected from the gas passage hole 45c, and the like. It will be decided.

The gas generated in the second combustion chamber S2, passing through the gas passage hole 45c described above and introduced into the first combustion chamber S1 then passes through the inside of the filter 70, and at that time, heat is taken by the filter 70. While being cooled, the slag contained in the gas is removed by the filter 70 and flows into the gas discharge chamber S3, and then is ejected toward the outside of the housing through the plurality of gas outlets 24 (). See arrow AR1).

In the second stage described above, the gas ejected from the plurality of gas outlets 24 to the outside of the disc type gas generator 1 is the same as in the case of the first stage described above, the disc type gas generator 1 It is introduced inside an airbag provided adjacent to the airbag to inflate and deploy the airbag.

After that, all of the first gas generator 51 housed in the first combustion chamber S1 and the second gas generator 52 housed in the second combustion chamber S2 are completely burned, so that the disk type gas generator 1 operates. Is completed.

As described above, in the disc type gas generator 1 according to the present embodiment, a cut 46a is provided so as to reach both of the pair of axial end portions, so that a part of the circumferential direction is interrupted. The substantially tubular cover member 46 having the above is press-fitted into the partition wall member 45, and the cover member 46 is configured to close all of the plurality of gas passage holes 45c provided in the partition wall member 45.

With this configuration, when the cover member 46 is assembled to the partition wall member 45, the cover member 46 can be elastically deformed so as to expand the diameter by utilizing the elastic force of the cover member 46. Therefore, the cover member 46 can be smoothly press-fitted into the partition wall member 45, and as a result, the assembling work can be performed very easily.

Therefore, with this configuration, compared to the case where the cover member is composed of a tubular plate-shaped member having no cut in the circumferential direction and the cover member is press-fitted into the partition wall member. It becomes unnecessary to control the dimensional accuracy of the cover member and the partition wall member more strictly, and the assembly work becomes greatly facilitated. This makes it possible to reduce the manufacturing cost as compared with the conventional case.

Further, even in the case of such a configuration, in the above-mentioned first step, while preventing the influence of the combustion of the first gas generating agent from affecting the second gas generating agent, in the above-mentioned second step, the second step. The original function of the partition, which is to bring out the gas generated in the second combustion chamber to the first combustion chamber after appropriately increasing the internal pressure of the combustion chamber, is not impaired, and the function is surely performed. It will also be demonstrated.

Here, with reference to FIGS. 1 to 5 (particularly, FIGS. 2, 3 and 5), the disc type gas generator 1 according to the present embodiment is provided with a cut 46a in the cover member 46. The partition portion 44 is positioned and assembled to the bottom plate portion 11 so that the formed portion is arranged at a position closest to the central axis of the peripheral wall portion of the housing. In particular, in the present embodiment, the cut 46a provided in the cover member 46 is positioned so as to face the first igniter 32 side.

On the other hand, in the disc type gas generator 1 according to the present embodiment, the plurality of gas passage holes 45c are in the vicinity of the portion of the tubular portion 45b of the partition wall member 45 corresponding to the cut 46a of the cover member 46 ( More specifically, it is provided on a pair of circumferential ends of the cover member 46 and a tubular portion 45b) of a portion covered by the vicinity thereof. That is, the plurality of gas passage holes 45c are unevenly distributed in the tubular portion 45b of the partition wall member 45 so as to sandwich the cut 46a of the cover member 46 in the circumferential direction of the partition wall member 45. The plurality of gas passage holes 45c are all arranged at positions on the central axis side of the peripheral wall portion of the housing when viewed from the central axis of the partition wall member 45.

With this configuration, as shown in FIG. 5, when the gas generated in the second combustion chamber S2 is introduced into the first combustion chamber S1, the high temperature and high pressure gas ejected from the partition portion 44 is generated. It is possible to prevent the filter 70 from being directly sprayed on the filter 70 at a close distance. Therefore, it is possible to prevent the filter 70 from being damaged, which may occur when the high-temperature and high-pressure gas is sprayed at a close distance.

In FIG. 5, for ease of understanding, the flow direction thereof is schematically indicated by an arrow AR2 so that the high-temperature and high-pressure gas ejected from the partition portion 44 radiates from the partition portion 44. However, in reality, when the cover member 46 does not fall off from the partition wall member 45 during operation (or in the state where it falls off but before it falls off), the high temperature ejected from the plurality of gas passage holes 45c The high-pressure gas is once sprayed onto the deformed cover member 46 to change its traveling direction and is introduced into the first combustion chamber S1.

Therefore, at this time, the high-temperature and high-pressure gas is sprayed onto the deformed cover member 46, which weakens the directivity of the high-temperature and high-pressure gas in the traveling direction, thereby weakening the flow velocity and part of the heat. Is taken away by the cover member 46, and the above-mentioned effect of preventing damage to the filter 70 can be obtained more effectively. Furthermore, since the high-temperature and high-pressure gas is sprayed onto the deformed cover member 46, the slag contained in the gas is effectively collected by the cover member 46, so that the slag can be collected. A secondary effect of enhanced function is also obtained.

In the present embodiment, the case where a plurality of gas passage holes are provided in the tubular portion of the partition wall member has been described as an example, but a single gas passage hole may be provided in the tubular portion. Good. Further, when a plurality of gas passage holes are provided in the tubular portion, it is not always necessary to provide the plurality of gas passage holes in a dotted line shape, and the layout thereof such as a matrix shape and a staggered shape can be arbitrarily changed.

Further, it is not always necessary to provide the gas passage hole composed of a plurality of or a single hole only at the position on the first igniter side of the partition wall member, and even if it is provided at the position opposite to the first igniter side. Good. Further, it is not always necessary to install the cut of the cover member so as to face the first igniter side, and the installation position thereof can be arbitrarily changed.

Further, in the present embodiment, the first igniter and the second igniter are energized at different timings so that the second igniter operates at a timing delayed from the operation timing of the first igniter. Although the case where it is configured has been described as an example, it may be configured to operate at the same timing by energizing them at the same timing. Further, even when the first igniter and the second igniter are energized at the same timing, the second igniter is provided by providing a delaying agent for delaying the ignition of the igniter in the ignition portion of the second igniter. The time required from energization to ignition of the igniting agent is extended, so that the first igniter and the second igniter are energized at the same timing, and the timing of the start of combustion of the second gas generating agent is set to the first. It may be configured so as to be delayed from the timing of starting combustion of the gas generating agent.

Further, in the present embodiment, the case where only the gas generating agent is filled in the second combustion chamber has been described as an example, but the second combustion chamber is provided with the explosive in addition to the gas generating agent. May be good.

Further, in the present embodiment, a case where the first igniter and the second igniter are configured to be assembled to the bottom plate portion of the housing via the first metal holder and the second holder, respectively, will be described as an example. However, both the first igniter and the second igniter may be configured to be assembled to the bottom plate portion of the housing by so-called insert molding. In that case, the disc-type gas generator will have a first holding portion and a second holding portion made of a resin molded portion in place of the first holder and the second holder described above, and will have the first igniter and the second holding portion. The second igniter will be assembled to the bottom plate portion of the housing via the first holding portion and the second holding portion, respectively.

Specifically, the first holding portion can be formed by injection molding using a mold, and a fluid resin material is poured so as to fill the space between the lower shell and the first igniter. Can be provided by solidifying. More specifically, the above-mentioned fluid resin material is reached from a part of the inner surface to a part of the outer surface of the bottom plate portion via the first opening provided in the bottom plate portion of the lower shell. By adhering it to the bottom plate portion and also adhering it to the base portion of the first igniter and solidifying the fluid resin material in this state, the first igniter is attached to the bottom plate portion of the housing via the first holding portion. Can be assembled to.

As a result, the first opening is embedded by the first holding portion, and the sealing property in the portion is ensured by the first holding portion, so that the airtightness of the space inside the housing can be ensured. The terminal pin of the first igniter may be configured so that a part thereof 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 extrapolated to the first holding portion to fix the cup body to the first holding portion by press fitting or the like, the explosive is ignited by the first igniter. It can also be arranged so as to face the part.

Further, the second holding portion can also be formed by injection molding using a mold like the first holding portion, and is a fluid resin so as to fill the space between the lower shell and the second igniter. It can be provided by pouring a material and solidifying it. More specifically, the above-mentioned fluid resin material is spread from a part of the inner surface to a part of the outer surface of the bottom plate portion via the second opening provided in the bottom plate portion of the lower shell. By adhering it to the bottom plate portion and also adhering it to the base portion of the second igniter and solidifying the fluid resin material in this state, the second igniter is attached to the bottom plate portion of the housing via the second holding portion. Can be assembled to.

As a result, the second opening is embedded by the second holding portion, and the sealing property in the portion is ensured by the second holding portion, so that the airtightness of the space inside the housing can be ensured. The terminal pin of the second igniter may be configured so that a part thereof penetrates the second holding portion and is pulled out to the outside. Further, in this case, for example, the partition wall member may be fixed to the second holding portion by press fitting or the like by extrapolating the open end of the bottomed substantially cylindrical partition wall member to the second holding portion, or the partition wall member may be attached to the bottom plate. If welding is performed on the portion, the second gas generating agent may be arranged so as to face the ignition portion of the second igniter.

Here, if the portion of the lower shell provided with the first opening and the second opening is projected in a tubular shape toward the inside of the housing, the first holding portion, the second holding portion, and the bottom plate portion are formed. By increasing the bonding area between the housing and the housing, the joint strength thereof can be increased, and a space for forming the female connector portion inside the tubular bent portion of the housing can be secured. In that case, the cup body or the partition wall member can be press-fitted into the tubular 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 having excellent heat resistance, durability, corrosion resistance and the like after curing is preferably selected and used. In that case, it is not limited to the thermosetting resin represented by epoxy resin and the like, but is represented by polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin (for example, nylon 6 and nylon 66), polypropylene sulfide resin, polypropylene oxide resin and the like. It is also possible to use a thermoplastic resin. When these thermoplastic resins are selected as raw materials, it is preferable to include glass fibers or the like as a filler in these resin materials 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 with the thermoplastic resin, it is not necessary to add the filler as described above.

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

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

Here, as the adhesive to be applied to the bottom plate portion in advance, an adhesive containing a resin material having excellent heat resistance, durability, corrosion resistance and the like as a raw material after curing is preferably used, for example, a cyanoacrylate-based resin. And those containing a silicone resin as a raw material are particularly preferably used. In addition to the above-mentioned resin materials, phenolic resin, epoxy resin, melamine resin, urea resin, polyester resin, alkyd resin, polyurethane resin, polyimide resin, polyethylene resin, polypropylene resin, etc. 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, polyallylate resin, polyether ether ketone resin , Polyamidoimide-based resin, liquid crystal polymer, styrene-based rubber, olefin-based rubber and the like 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 housed via a holding portion made of a resin molded portion. It may be fixed to.

In addition, as in the case of the present embodiment, the base of the first igniter assembly and the second igniter assembly is composed of the first holder and the second holder, respectively, while the first holder and the first ignition are formed. The first igniter assembly is formed by joining the device with the resin molding part, and the second igniter assembly is formed by joining the second holder and the second igniter with the resin molding part. A three-dimensional structure may be formed, and the first holder and the second holder may be joined to the bottom plate portion by welding or the like.

As described above, the above-described embodiment disclosed this time is an example in all respects and is not limiting. The technical scope of the present invention is defined by the scope of claims and includes all modifications within the meaning and scope equivalent to the description of the scope of claims.

1 Disc type gas generator, 10 Lower shell, 11 Bottom plate, 11a 1st opening, 11b 2nd opening, 12 Peripheral wall, 20 Upper shell, 21 Top plate, 22 Peripheral wall, 23 Flange, 24 Gas spout, 25 Seal tape, 30 1st igniter assembly, 31 1st holder, 31a upper recess, 31b lower recess, 31c through hole, 31d, 31e caulking part, 32 1st igniter, 32a base, 32b Ignition part, 32c terminal pin, 33 1st seal member, 34 cup body, 34a top wall part, 34b side wall part, 34c flange part, 35 fire room, 36 fire liquor, 40 2nd igniter assembly, 41st 2 holder, 41a upper recess, 41b lower recess, 41c through hole, 41d caulking part, 42 second igniter, 42a base, 42b ignition part, 42c terminal pin, 43 second seal member, 44 partition part, 45 partition member , 45a closed part, 45b tubular part, 45b1 fixed part, 45c gas passage hole, 46 cover member, 46a cut, 51 first gas generator, 52 second gas generator, 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 (3)

A housing including a peripheral wall portion provided with a gas outlet, a top plate portion that closes one end of the peripheral wall portion in the axial direction, and a bottom plate portion that closes the other end of the peripheral wall portion in the axial direction.
A tubular filter housed inside the housing so that the outer peripheral surface faces the inner peripheral surface of the peripheral wall portion.
A first combustion chamber in which a first gas generating agent is housed in the space inside the filter by forming a cup-like shape as a whole having a closed end on the top plate portion side and assembling to the bottom plate portion. And a partition that divides the second combustion chamber into which the second gas generating agent is housed,
A first igniter assembled to the bottom plate portion so as to face the first combustion chamber, which is a space outside the partition portion.
A second igniter assembled to the bottom plate portion so as to face the second combustion chamber, which is a space inside the partition portion, is provided.
The partition portion includes a cup-shaped partition wall member including a closing portion forming the closing end by being located on the top plate side and a tubular portion facing the inner peripheral surface of the filter, and a pair of axial ends. It has a substantially tubular cover member having a shape in which a part in the circumferential direction is interrupted by providing a cut so as to reach both of the portions.
The cover member is assembled to the partition wall member so as to be in pressure contact with the tubular portion by being addressed to the outer surface of the tubular portion.
The tubular portion is provided with a gas passage hole for passing the gas generated in the second combustion chamber toward the first combustion chamber.
The gas passage hole is closed by the cover member.
When the second igniter is operating, the cover member is deformed due to the pressure increase in the second combustion chamber caused by the combustion of the second gas generating agent, so that the gas passes through the cover member. A gas generator in which the closure of the holes is released, and the gas generated in the second combustion chamber is introduced into the first combustion chamber by passing through the gas passage holes. The filter is arranged coaxially with the housing so that the central axis of the filter overlaps the central axis of the peripheral wall portion.
The partition portion is eccentrically arranged with respect to the housing so that the central axis of the partition wall member does not overlap with the central axis of the peripheral wall portion.
The portion of the cover member provided with the cut is arranged at a position closest to the central axis of the peripheral wall portion.
The gas generator according to claim 1, wherein the gas passage hole is provided only in the vicinity of a portion of the tubular portion corresponding to the cut. The gas generator according to claim 1 or 2, wherein a plurality of the gas passage holes are provided in a dotted line along the circumferential direction of the tubular portion.

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