JP2022099202A - Gas generator - Google Patents

Abstract

To provide a gas generator whose output and inner pressure can be controlled more easily than before, although the generator is configured simpler than before.SOLUTION: A gas generator 100 comprises a housing formed in a short nearly cylindrical shape whose both ends in an axial direction are closed and constituted of a lower part side shell 10 and an upper part side shell 20. In a storage space formed inside the housing are stored a holding part 36 formed of resin materials for instance and constituted integrally of a portion arranged in the housing and a portion arranged outside the housing, a partitioning member 30, an igniter 40, a gas generating agent 61, a seal tape 24, a filter 70 and the like. Further, a filter chamber 50 is formed at the upper part-side shell 20 side and a gas generating agent storage chamber 60 (a combustion chamber) is formed at the lower part-side shell 10 side, by making the partitioning member 30 partition the storage space in the axial direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas generator incorporated in an occupant protection device, and more specifically to a disc type gas generator incorporated in an airbag device installed in an automobile steering wheel 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 occupants 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 occupants. 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 unfolds the airbag. The airbag device is installed in, for example, a steering wheel or an instrument panel of an automobile.

There are various types of such gas generators, but as a gas generator preferably used for a driver's side airbag device installed in a steering wheel or the like, a so-called disk type gas generator is used. There is. In general, a disk-type gas generator has a short cylindrical housing with an axial end closed, a gas outlet is provided on the peripheral wall of the housing, and a gas generator, an igniter, and a filter are provided inside the housing. Etc. are housed.

Further, in the disk-type gas generator in Patent Document 1 below, the gas outlet is cleaved in multiple stages for the purpose of relatively easily controlling the output and the internal pressure in a low temperature environment.

Japanese Unexamined Patent Publication No. 2017-81236

However, in Patent Document 1, since the gas outlet communicates with the inside of the airbag, it is necessary to make the gas outlet designed according to the airbag, so that a very complicated design is required. You will need it.

Therefore, an object of the present invention is to provide a gas generator capable of controlling the output and the internal pressure more easily than the conventional one, even though the configuration is simpler than the conventional one.

(1) A gas generating agent separates the inside of the housing from a disk-shaped housing in which a plurality of gas outlets are arranged, a seal-shaped closing member that closes the gas outlets inside the housing, and a gas generating agent. A partition member forming a filled combustion chamber and a filter chamber provided with a filter, and an ignition unit for burning the gas generating agent in the combustion chamber are provided, and the partition member includes the combustion. A plurality of through holes capable of communicating the chamber and the filter chamber, and the plurality of through holes on the combustion chamber side in an initial state are closed, and when the gas generating agent is burned to generate gas, the gas is generated. A breaking member that breaks due to pressure is provided, the filter is sandwiched between the inner wall of the housing and the partition member, and is fixed in the filter chamber, and the plurality of gas outlets are the said. It communicates with the filter chamber, and is characterized in that the gas generated inside the combustion chamber is ejected to the outside through the filter chamber and the filter.

(2) In the gas generator of the above (1), it is preferable that the plurality of through holes include holes having two or more different diameters.

(3) In the gas generator of the above (1) or (2), the housing has a lower shell and an upper shell connected at a joint formed by welding, and the housing has the upper shell. The partition member is made of metal in which the plurality of gas outlets are arranged, and faces a part of the peripheral wall portion of the lower shell on which the joint portion is formed and a part of the peripheral wall portion. It is preferable that the end portion of the partition member on the lower side shell side is press-fitted or loosely fitted inside the lower side shell in a state where a space is formed between the partition member and the lower side shell.

(4) In the gas generator of the above (3), the partition member is a disk-shaped first member having a plurality of through holes formed in the central portion, and one end thereof is press-fitted into the inside of the lower shell. Alternatively, a second member which is a loosely fitted tubular member and whose other end is fixed to the lower shell side of the first member.
In the second member, the diameter from the other end to the portion facing the joint is formed to be smaller than the diameter other than the portion facing the joint from the other end. In the lower shell, the diameter from at least the portion of the peripheral wall portion of the lower shell to the end of the upper shell side is at least from the bottom of the lower shell to the lower shell. It is preferable that the diameter is larger than the diameter up to the middle portion of the peripheral wall portion which is not related to the joint portion.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a gas generator capable of controlling the output and the internal pressure more easily than the conventional one, even though the configuration is simpler than the conventional one.

It is sectional drawing which shows the gas generator which concerns on one Embodiment of this invention. (A) is a plan view of the first member of the partition member used for the gas generator of FIG. 1, and (b) is a cross-sectional view taken along the line of FIG. 1 (a). It is sectional drawing which shows the modification of the gas generator of FIG.

Hereinafter, the gas generator according to the embodiment of the present invention will be described with reference to the drawings. In the following, a disk type gas generator will be described as an example of the type of gas generator, but the present invention is not limited thereto.

As shown in FIG. 1, the gas generator 100 is formed in a short substantially cylindrical shape in which both ends in the axial direction are closed, and is composed of a lower shell (initiator shell) 10 and an upper shell (closure shell) 20. Has a housing. In the accommodation space provided inside the housing, for example, a holding portion 36 formed of a resin material and integrally composed of a portion disposed inside the housing and a portion disposed outside the housing. , A partition member 30, an igniter 40, a gas generating agent 61, a sealing tape (closing member) 24, a filter 70, and the like are housed. Further, by partitioning the accommodation space in the axial direction (vertical direction in FIG. 1) by the partition member 30, the filter chamber 50 is formed on the upper shell 20 side, and the gas generating agent accommodation chamber 60 (combustion chamber) is the lower shell. It is formed on the 10 side.

The lower shell 10 and the upper shell 20 are press-molded products formed by pressing a rolled metal plate-shaped member. Specifically, the lower shell 10 and the upper shell 20 press a rolled metal plate-shaped member from above and below using, for example, a pair of dies consisting of an upper die and a lower die. As a result, it is formed into a shape as shown in the figure.

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 and a peripheral wall portion 22. That is, each end portion in the axial direction of the housing is closed by the top plate portion 21 and the bottom plate portion 11. For joining the joint portion 26 between the lower shell 10 and the upper shell 20, for example, a method such as electron beam welding, laser welding, or friction welding can be preferably used.

The upper shell 20 has a fixing portion 25 that continuously protrudes outward from the lower end of the peripheral wall portion 22. The fixing portion 25 is a portion for fixing the housing to an external member (not shown), whereby the gas generator 100 is supported by the external member via the fixing portion 25 after installation. become. The thickness of the upper shell 20 is preferably 2.0 mm or less, more preferably 1.8 mm or less.

Further, in the central portion of the bottom plate portion 11 of the lower shell 10, a protruding tubular portion 13 projecting toward the top plate portion 21 side is provided. As a result, a recessed portion 14 is formed in the central portion of the bottom plate portion 11 by the outer wall of the protruding tubular portion 13. The protruding tubular portion 13 is a part of the metal lower shell 10, and is a portion of the holding portion 36 to which the igniter 40 is fixed via a portion disposed in the housing. The protruding tubular portion 13 is formed in a substantially cylindrical shape with a bottom, and a circular opening 15 in a plan view is provided at an axial end portion located on the top plate portion 21 side. The opening 15 is a portion through which the terminal pins 42 and 43 made of a pair of metal materials such as iron, aluminum, and stainless steel of the igniter 40 are inserted. The terminal pins 42 and 43 are arranged so as to project from the recessed portion 14 toward the outside of the housing (lower side shell 10 side) via the opening 15. The size of the opening 15 is smaller than the outer shape of the ignition portion, which is the maximum outer shape portion of the igniter 40. As a result, even if the holding portion 36 is unexpectedly damaged, the igniter 40 passes through the opening 15 and jumps out of the housing due to the pressure rise inside the housing. Is prevented. The thickness of the lower shell 10 is preferably 2.0 mm or less, more preferably 1.8 mm or less. The method of fixing the terminal pins 42 and 43 will be described later.

The holding portion 36 holds the terminal pins 42 and 43 of the igniter 40 in a partially exposed state, and is a harness for electrically connecting the terminal pins 42 and 43 and the control unit (not shown). It has a female connector portion 36a for connecting a male connector (not shown). The holding portion 36 is formed, for example, by insert molding using a resin material. Specifically, the igniter 40 is inserted through the opening 15 of the lower shell 10. Next, the lower shell 10 is fixed with the lower mold (not shown), and the igniter 40 is fixed with the upper mold (not shown). The resin material is poured from the upper mold to form the holding portion 36.

The igniter 40 is arranged in the housing by being held by the holding portion 36. The igniter 40 generates a flame and includes an ignition unit (not shown) provided inside and the terminal pins 42 and 43 described above. The terminal pins 42 and 43 are metal (metal materials such as iron, aluminum, stainless steel) holding members (eyelets) provided in the squib cup (bottomed cup member) 44 of the igniter 40 (not shown). ) Is held directly or indirectly. The ignition unit (not shown) includes an igniting agent (not shown) that ignites and burns during operation to generate a flame, and a resistor (bridge wire) for igniting the igniting agent (shown). ) And is included. The terminal pins 42 and 43 are connected to each other via the resistor in order to ignite the ignition charge. The resistor is attached so as to connect the tips of the terminal pins 42 and 43, and the igniter is loaded in the squib cup 44 so as to surround or approach the resistor. .. 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 igniter.

When a collision is detected, a predetermined amount of current flows through the resistor through the terminal pins 42 and 43. When an electric current flows through the resistor, Joule heat is generated in the resistor and the igniter starts combustion. The high temperature flame generated by the combustion causes the squib cup 44 containing the igniter to explode. The time from when a current flows through the resistor until the igniter 40 operates is generally 2 milliseconds or less when a nichrome wire is used for the resistor.

The partition member 30 includes a disk-shaped first member 31 shown in FIG. 2 and a bottomed cylindrical second member 32. Since the partition member 30 is configured to be separable into the first member 31 and the second member 32, gas is generated rather than the partition member 30 in which the first member 31 and the second member 32 are integrally formed. It is easy to assemble the vessel 100. Further, the first member 31 and the second member 32 may or may not be bonded or welded at the points where they are in contact with each other. When this adhesion or welding is not performed, the first member 31 is fixed in a state of being sandwiched between the filter 70 and the second member 32. Further, the first member 31 has a central portion 31a, a connecting portion 31b, an annular portion 31c, and a protruding portion 31d.

As shown in FIGS. 1 and 2, the central portion 31a is provided with a plurality of through holes 31a1 and 32a2 that allow the filter chamber 50 and the gas generating agent accommodating chamber 60 to communicate with each other. In the present embodiment, as shown in FIG. 2, these plurality of through holes include two types of holes having different diameters, but all of them may have the same diameter or three types. It may include holes having different diameters as described above. The connecting portion 31b is a portion that connects the outer periphery of the central portion 31a and the inner periphery of the annular portion 31c and bridges the central portion 31a and the annular portion 31c in a stepped shape. The protrusion 31d is a portion that stands up on the upper shell 20 side around the outer circumference of the annular portion 31c and protrudes, and is used for positioning the filter 70.

As shown in FIG. 1, the second member 32 has a bottom portion 32a, a tubular portion 32b, and a tubular portion 32c. A hole 32a1 in which the central portion 31a and the connecting portion 31b of the first member 31 are fitted is formed in the central portion of the bottom portion 32a. Further, the upper shell 20 side of the bottom portion 32a is fixed to the surface of the annular portion 31c of the first member 31 on the lower side shell 10 side by adhesion or welding. The tubular portion 32b is connected to the bottom portion 32a in a state of standing upright from the outer periphery of the bottom portion 32a to the lower shell 10. The tubular portion 32c is formed by expanding the diameter from the end portion of the tubular portion 32b on the lower shell 10 side, and is press-fitted or loosely fitted into the lower shell 10. As a result, a space S is formed between the tubular portion 32b at a position facing the joint portion 26 and the inner wall of the lower shell 10. By forming this space S, it is possible to insulate the gas generating agent accommodating chamber 60 when the joint portion 26 becomes hot when formed by welding or the like.

The breaking member 33 is provided on the gas generating agent accommodating chamber 60 side of the partition member 30 so as to close the plurality of through holes 31a1 and 32a2 in the initial state. The internal pressure of the gas generating agent accommodating chamber 60 can be controlled by adjusting the size of the diameters of the gas generating agent 61 and the plurality of through holes 31a1 and 32a2, and the material and thickness of the breaking member 33. .. Here, by controlling the internal pressure of the gas generating agent accommodating chamber 60, the gas generating agent 61 can be stably and continuously burned. Further, since the through holes having different diameters are gradually released as the pressure in the combustion chamber rises, stable combustion characteristics can be obtained regardless of the surrounding environment by providing the through holes having different diameters. As the breaking member 33, for example, an aluminum foil or the like having an adhesive member coated on one side is used. As a result, the airtightness of the gas generating agent accommodating chamber 60 is ensured.

The gas generating agent accommodating chamber 60 is a space on the lower shell 10 side partitioned by the partition member 30 among the spaces inside the housing composed of the lower shell 10 and the upper shell 20, and the above-mentioned igniter 40. Is a space surrounding the portion where the gas generator 61 is arranged, and forms a space in which the gas generating agent 61 is accommodated.

The gas generating agent 61 is an integrally molded product that is ignited by a flame generated by being ignited by the igniter 40 and generates gas by burning. The gas generating agent 61 is generally formed as a molded body containing a fuel, an oxidizing agent, and an additive. 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 or potassium perchlorate, alkali metals, and alkaline earth metals. , Transition metals, nitrates containing cations selected from ammonia, etc. are used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used. In addition, examples of the additive include a binder, a slag forming agent, a combustion adjusting agent, and the like. As the binder, for example, a cellulose derivative such as hydroxypropylene methyl cellulose, a metal salt of carboxymethyl cellulose, an organic binder such as stearate, synthetic hydroxytalcite, and an inorganic binder such as acidic clay can be preferably used. As the slag forming agent, silicon nitride, silica, acidic white clay and the like can be preferably used. Further, as the combustion adjusting agent, metal oxide, ferrosilicon, activated carbon, graphite and the like can be preferably used.

The filter chamber 50 is provided with a filter 70 fixed by being sandwiched between the inner wall of the upper shell 20 (top plate portion 21 in this embodiment) and the first member 31 of the partition member 30. As a result, the gas flows out from the gap between the upper end of the filter 70 and the top plate portion 21 and the gap between the lower end of the filter 70 and the first member 31 of the partition member 30 without passing through the filter 70. To prevent that. The filter 70 has a cylindrical shape and is arranged so that its central axis substantially coincides with the axial direction of the housing.

The filter 70 has a tubular shape formed by winding a plate-shaped metal member having a plurality of holes through which gas can pass (for example, what is called hook metal, punching metal, or expanded metal). , Stainless steel, steel and other metal wires wound and sintered, or steel agents formed by folding the metal wires and compacted by press working are 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 gas generating agent accommodating chamber 60 passes through the filter 70, and also serves as a gas. It also functions as a removing means for removing residues (slag) and the like contained therein. Therefore, in order to sufficiently cool the gas and prevent the residue from being released to the outside, it is necessary to ensure that the gas generated in the gas generating agent accommodating chamber 60 passes through the filter 70. be.

Subsequently, a plurality of gas outlets 23 are provided on the peripheral wall portion 22 of the upper shell 20 (that is, the peripheral wall portion of the portion located closer to the top plate portion 21 than the position where the fixed portion 25 is provided). ing. The gas outlet 23 is for discharging the gas that has passed through the filter 70 to the outside of the housing. Further, a sealing tape 24 is attached to the peripheral wall portion 22 of the upper shell 20 so as to close the gas outlet 23. As the sealing tape 24, an aluminum foil or the like having an adhesive member coated on one side thereof is used. As a result, the airtightness of the gas generating agent accommodating chamber 60 is ensured. The output of the gas generator 100 is controlled by controlling the internal pressure of the gas generator accommodating chamber 60 described above, adjusting the diameter of the gas outlet 23, and adjusting the material and thickness of the sealing tape 24. be able to.

In the above configuration, when a vehicle equipped with the gas generator 100 collides, the collision is detected by the collision detecting means provided in the vehicle, and the terminal pin 42 from the control unit provided in the vehicle, The igniter 40 is activated by energizing the 43. The flame generated by the operation of the igniter 40 ignites and burns the gas generator 61 housed in the gas generator storage chamber 60 to generate a large amount of gas. The gas generated in the gas generating agent accommodating chamber 60 breaks the breaking member 33 provided in the first member 31 of the partition member 30 and enters the filter chamber 50. Then, the gas passes through the filter 70, and at that time, heat is taken away by the filter 70 to be cooled, and slag contained in the gas is removed by the filter 70 and flows into the outer peripheral edge of the housing (upper shell 20). .. Then, as the internal pressure of the housing rises, the sealing by the sealing tape 24 that closes the gas outlet 23 is broken, and the gas is ejected to the outside of the housing through the gas outlet 23. The ejected gas is introduced into the inside of the airbag connected to the gas generator 100, and the airbag is expanded and expanded.

According to the present embodiment of the above configuration, it is possible to provide a gas generator 100 capable of controlling the output and the internal pressure more easily than the conventional one, even though the configuration is simpler than the conventional one.

Further, since the space S is formed, it is possible to insulate the gas generating agent accommodating chamber 60 when the joint portion 26 becomes hot when formed by welding or the like. Further, since the space S effectively utilizes the space inside the housing, it can contribute to the miniaturization of the gas generator 100.

Further, since the gas generating agent accommodating chamber 60 can be configured to have only the volume required for filling the required amount of the gas generating agent 61, there is no extra space. Therefore, the degree of increase to the desired internal pressure value of the gas generating agent accommodating chamber 60 (for example, the pressure value at which the breaking member 33 breaks) becomes large.

Further, the through holes 31a1 and 32a2 in the partition member 30 have a higher degree of freedom in design than the gas outlet 23 provided in the housing. That is, the gas generator 100 can be easily controlled to a desired output. In particular, since the internal pressure of the gas generating agent accommodating chamber 60 can be easily controlled by the through holes 31a1 and 32a2 in the partition member 30 and the breaking member 33, the pressure for breaking the sealing tape 24 at the gas ejection port 23 -The gas generating agent 61 can be stably burned regardless of the time.

Further, according to the present embodiment having the above configuration, during operation, "internal pressure value of gas generating agent accommodating chamber 60> internal pressure value of filter chamber 50" is inevitably set. At this time, since the filter 70 is further sandwiched between the first member 31 of the partition member 30 and the top plate portion 21 of the upper shell 20, the generated gas does not pass through the filter 70 and is connected to the upper end of the filter 70. It further prevents the outflow from the gap between the top plate portion 21 and the gap between the lower end of the filter 70 and the first member 31 of the partition member 30.

Although the embodiments of the present invention have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is shown by the scope of claims rather than the description of the embodiment described above, and further includes all modifications within the meaning and scope equivalent to the scope of claims. For example, the following variants are included.

In the above embodiment, the second member 32 in which the tubular portions 32b and 32c are formed in a stepped shape is used to form a space S for heat insulation between the second member 32 and the lower shell 10. The configuration for forming S is not limited to this. For example, as shown in FIG. 3, for the peripheral wall portion 112 of the lower shell 110, the tubular portions 112a and 112b (diameter of the tubular portion 112a> diameter of the tubular portion 112b) are formed in a stepped shape to generate gas. A heat insulating space S1 may be formed so that the agent 161 is not affected by heat from the welded portion 126. In the modified example of FIG. 3, the same parts as those in the above embodiment are shown using the same reference numerals in the last two digits unless otherwise specified, and thus the description thereof will be omitted.

Further, in the above embodiment, the filter 70 has a configuration in which the filter 70 is sandwiched between the first member 31 of the partition member 30 and the top plate portion 21 of the upper shell 20. I can't. That is, if the filter is fixed by being sandwiched between any part of the inner wall of the housing and the partition member in a state where the filter functions as described above, it is provided at any position in the filter chamber. It doesn't matter what the shape is.

Further, the partition member 30 in the above embodiment is in a state where it can be separated into the first member 31 and the second member 32, but the present invention is not limited to this. For example, the partition member 30 may be a substantially bottomed cylindrical member in which the first member 31 and the second member 32 are integrally formed.

10, 110 Lower shell 11, 111 Bottom plate 12, 112 Peripheral wall 13, 113 Protruding cylinder 14, 114 Recess 15, 115 Opening 20, 120 Upper shell 21, 121 Top plate 22, 122 Peripheral wall 23, 123 Gas outlet 24, 124 Seal tape 25, 125 Fixing part 26, 126 Joint part 30, 130 Partition member 31, 131 First member 31a, 131a Central part 31a1, 131a1 Through hole 31b, 131b Connection part 31c, 131c Circular portion 31d, 131d Projection portion 32, 132 Second member 32a, 132a Bottom portion 32a1, 132a1 Hole 32a2, 132a2 Through hole 32b, 32c, 112a, 112b, 132b, 132c Cylindrical portion 33, 133 Breaking member 36, 136 Holding portion 36a, 136a Female connector 40, 140 Ignition 42, 43, 142, 143 Terminal pin 44, 144 Squib cup 50, 150 Filter chamber 60, 160 Gas generator storage chamber 61, 161 Gas generator 70, 170 Filter 100 , 200 Gas generator S, S1 Space

Claims (4)

A disc-shaped housing with multiple gas outlets and
A seal-shaped closing member that closes the gas outlet inside the housing,
A partition member that partitions the inside of the housing to form a combustion chamber filled with a gas generating agent and a filter chamber provided with a filter.
An ignition unit that burns the gas generating agent in the combustion chamber,
Equipped with
The partition member
A plurality of through holes capable of communicating the combustion chamber and the filter chamber,
A breaking member that closes the plurality of through holes in the initial state on the combustion chamber side and breaks due to the pressure of the gas when the gas generating agent burns to generate gas.
Is provided,
The filter is sandwiched between the inner wall of the housing and the partition member and fixed in the filter chamber.
The plurality of gas outlets communicate with the filter chamber, and the gas generated inside the combustion chamber is ejected to the outside through the filter chamber and the filter. vessel. The gas generator according to claim 1, wherein the plurality of through holes include holes having two or more types of different diameters. The housing is made of metal and has a lower shell and an upper shell connected at a joint formed by welding, and the plurality of gas outlets are arranged in the upper shell.
The lower part of the partition member in a state where a space is formed between a part of the peripheral wall portion of the lower shell on which the joint portion is formed and the partition member facing the part of the peripheral wall portion. The gas generator according to claim 1 or 2, wherein the end portion on the side shell side is press-fitted or loosely fitted inside the lower shell. The partition member
A disk-shaped first member having a plurality of through holes formed in the central portion,
A second member whose one end is a tubular member press-fitted or loosely fitted inside the lower shell and whose other end is fixed to the lower shell side of the first member.
Including
In the second member, the diameter from the other end to the portion facing the joint is smaller than or smaller than the diameter other than the portion facing the joint from the other end.
In the lower shell, the diameter from at least the portion of the peripheral wall portion of the lower shell to the end of the upper shell side is at least from the bottom of the lower shell to the lower shell. It is formed larger than the diameter up to the middle part of the peripheral wall portion that is not related to the joint portion.
The gas generator according to claim 3, wherein the gas generator is characterized in that.

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