WO2022209798A1 - Gas generator - Google Patents

Gas generator Download PDF

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Publication number
WO2022209798A1
WO2022209798A1 PCT/JP2022/011148 JP2022011148W WO2022209798A1 WO 2022209798 A1 WO2022209798 A1 WO 2022209798A1 JP 2022011148 W JP2022011148 W JP 2022011148W WO 2022209798 A1 WO2022209798 A1 WO 2022209798A1
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WIPO (PCT)
Prior art keywords
filter
housing
gas generator
igniter
gas
Prior art date
Application number
PCT/JP2022/011148
Other languages
French (fr)
Japanese (ja)
Inventor
大空 冨田
Original Assignee
日本化薬株式会社
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Filing date
Publication date
Application filed by 日本化薬株式会社 filed Critical 日本化薬株式会社
Publication of WO2022209798A1 publication Critical patent/WO2022209798A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic

Definitions

  • the present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted in an automobile or the like, and more particularly to a so-called cylinder-shaped gas generator having a long cylindrical shape.
  • a long cylindrical housing contains a sealed container that contains a gas generating agent and is in contact with one end of a filter through a thin partition plate (with a hole in the center).
  • gas generators are known (see, for example, Patent Document 1 below).
  • the breaking strength (bursting pressure) of the end portion of the closed container on the filter side and the size of the flow path of the generated gas in the filter (hereinafter referred to as flow path size) are , will all depend on the inner diameter of the filter or the inner diameter of the hole in the center of the partition plate. That is, conventionally, the tearing strength of the filter-side end portion of the closed container and the channel size cannot be designed separately. Therefore, in the past, it was not easy to fine-tune the performance of the gas generator, including the residue collection by the filter.
  • the gas generator of the present invention comprises a long housing, an igniter provided at one end of the housing for igniting a gas generating agent, a filter provided at the other end of the housing, and the A tubular member provided inside the housing between the igniter and the filter and containing the gas generating agent, and a tubular member provided inside the housing between the tubular member and the filter, wherein the ignition A first tubular portion having an opening formed at the end on the device side, and an annular abutment provided on the filter side of the first tubular portion and abutting on the igniter-side end of the filter. and a partition member having a contact portion, wherein the first tubular portion has an inner diameter larger than the inner diameter of the filter, and the opening abuts the filter-side end of the tubular member. A hole is formed in the central portion of the contact portion.
  • the partition member further includes a second cylindrical portion extending from the inner peripheral edge of the hole and having an outer diameter equal to or less than the inner diameter of the filter. It is preferable that the two tubular portions are inserted inside the filter.
  • the contact portion extends from the first cylindrical portion and has a cross section that shrinks from the first cylindrical portion side to the filter side. It may have a tapered shape with a diameter and at least a portion of which is inserted inside the filter.
  • the present invention it is possible to design the splitting strength of the end portion of the closed container on the filter side and the flow channel size separately, and to provide a gas generator whose performance can be easily adjusted.
  • FIG. 2 is a schematic diagram showing an enlarged vicinity of a partition member in FIG. 1; It is the schematic diagram which expanded and showed the partition member vicinity of the gas generator which concerns on a modification.
  • FIG. 5 is a schematic cross-sectional view showing a housing used in a gas generator according to another modified example;
  • the gas generator 100 has a long, substantially cylindrical outer shape, and includes a housing 10 , a holder 20 attached to one open end of the housing 10 , and a holder 20 that closes the other open end of the housing 10 .
  • a closing member 12 attached to the other end of the housing 10, a cylindrical sealed container 34 (cylindrical member) containing the gas generating agent 31, a filter 41 for collecting residue of the generated gas, and a partition member 36 provided between the filter 41 and the sealed container 34 .
  • the housing 10 is a long cylindrical member having peripheral walls 10a and 10e and openings at both ends in the axial direction.
  • the closing member 12 has an annular groove 13 formed on the peripheral surface of the closing member 12 so as to extend in the circumferential direction.
  • a gas ejection port 11 is provided in the peripheral wall near the end of the housing 10 on the side where the closing member 12 is attached.
  • the gas ejection port 11 is a hole for ejecting gas generated inside the gas generator 100 to the outside, and is provided in plural along the circumferential direction and the axial direction of the housing 10 .
  • the closing member 12 is made of metal such as stainless steel, steel, aluminum alloy, or stainless alloy. Then, as shown in FIG. 1, with a part of the closing member 12 inserted into one open end of the housing 10, a portion of the housing 10 corresponding to the annular groove 13 on the peripheral surface of the closing member 12 is removed. The closing member 12 is fixed to the housing 10 by caulking the peripheral wall 10 a by reducing its diameter (caulking) radially inward and engaging it with the annular groove 13 .
  • the holder 20 is made of metal such as stainless steel, iron steel, aluminum alloy, or stainless alloy, and has a tapered fitting portion 23 to which the igniter 50 is fitted, and a fitting portion 23 extending circumferentially on the outer peripheral surface.
  • the peripheral wall 10 e of the housing 10 at a portion corresponding to the annular groove 22 provided on the outer peripheral surface of the holder 20 is radially contracted (crimped) to engage with the annular groove 22 .
  • the holder 20 is fixed by caulking.
  • the fitting portion 21 of the holder 20 is formed with a female connector.
  • This female connector is a portion to which a male connector of a harness for transmitting a signal from collision detection means provided separately from the gas generator 100 is connected.
  • a retainer (not shown) is attached to the female connector. This retainer is attached to prevent the cylindrical gas generator 100 from malfunctioning due to electrostatic discharge or the like when the gas generator 100 is transported. The contact with the terminal pin 52 is released by inserting the male connector into the female connector.
  • an igniter 50 as ignition means for the gas generating agent 31 is arranged at one axial end of the housing 10 (that is, a portion near the holder 20).
  • the igniter 50 and the holder 20 for fixing the igniter 50 function as ignition means for generating a flame for burning the granular gas generating agent 31, which will be described later.
  • the igniter 50 is inserted into the fitting portion 23 of the holder 20 and held together with a substantially cylindrical member 53, which will be described later. More specifically, the igniter 50 includes a base frame through which a pair of terminal pins 52 are inserted and held, and a squib cup 51 (cup-shaped member) mounted on the base frame. A resistor (bridge wire) is attached so as to connect the tips of the terminal pins 52 inserted into the squib cup 51 so as to surround or contact the resistor.
  • a nichrome wire or the like is generally used as the resistor, and ZPP (zirconium/potassium perchlorate), ZWPP (zirconium/tungsten/potassium perchlorate), lead tricinate, or the like is generally used as the igniter.
  • the squib cup 51 may be filled with a transfer charge as well.
  • a predetermined amount of current flows through the resistor via the terminal pin 52 .
  • Joule heat is generated in the resistor, and the igniter starts burning upon receiving this heat.
  • a high-temperature flame generated by the combustion ruptures the squib cup 51 containing the ignition charge.
  • the time from when the current flows through the resistor until the igniter 50 is activated is 2 milliseconds or less when the nichrome wire is used as the resistor.
  • the squib cup 51 is generally made of metal or resin.
  • a substantially cylindrical member 53 that covers the peripheral wall portion of the squib cup 51 except for the vicinity of the tip portion is crimped and fixed to the holder 20 by the crimp portion 24 together with the igniter 50 .
  • the substantially cylindrical member 53 is a directional member that directs the direction of the flame generated in the igniter 50 to the sealed container 34 side during operation.
  • a coil spring 54 is provided along the inner wall of the housing 10 around the squib cup 51 and the substantially cylindrical member 53 . One end of the coil spring 54 abuts an end of the lid portion 34 b of the closed container 34 , which will be described later, and the other end abuts an inner end of the holder 20 .
  • a tubular sealed container 34 in which a gas generating agent 31 and the like are sealed, and a filter 41 are loaded in parallel in the axial direction of the housing 10.
  • the sealed container 34 is preferably made of metal such as aluminum.
  • the sealed container 34 has a bottomed cylindrical portion 34a and a lid portion 34b, and contains therein a gas generating agent 31, a coil spring 35, an AI agent 32, a cover member 33, a partition member 36, are arranged.
  • the bottomed tubular portion 34a has an end portion 34c that serves as a bottom portion.
  • the lid portion 34b and the tip portion of the igniter 50 are spaced apart from each other by a predetermined distance. This makes it easier for the squib cup 51 to split when the igniter 50 is activated.
  • End portion 34c may also be tailored to either rupture or split upon actuation by varying thickness and/or material.
  • the gas generating agent 31 is an integrally molded product that is ignited by the flame generated by the igniter 50 and burns to generate gas. Also, the gas generating agent 31 is generally formed as a molded body containing fuel, oxidant and additive.
  • the fuel for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used. Specifically, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used.
  • oxidizing agents include basic metal hydroxides such as basic copper nitrate and basic copper carbonate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals and alkaline earth metals. , transition metals, and nitrates containing cations selected from ammonia are used. As nitrates, for example, sodium nitrate, potassium nitrate and the like are preferably used. Additives include binders, slag forming agents, combustion modifiers, and the like.
  • Suitable binders include cellulose derivatives such as hydroxypropylene methyl cellulose, organic binders such as metal salts of carboxymethyl cellulose and stearates, and inorganic binders such as synthetic hydroxytalcite and acid clay.
  • cellulose derivatives such as hydroxypropylene methyl cellulose
  • organic binders such as metal salts of carboxymethyl cellulose and stearates
  • inorganic binders such as synthetic hydroxytalcite and acid clay.
  • silicon nitride, silica, acid clay, etc. can be suitably used.
  • Metal oxides, ferrosilicon, activated carbon, graphite and the like can be suitably used as combustion modifiers.
  • the coil spring 35 is spirally wound so that the overall appearance resembles a truncated cone.
  • One end of the coil spring 35 is in contact with the lid portion 34b, and the other end of the spiral spring 35 is in contact with the gas generating agent 31, thereby urging the gas generating agent 31 with an elastic force. It is designed to By this urging, the gas generating agent 31 is fixed in the sealed container 34 so as to be sandwiched between the coil spring 35, the end portion of the filter 41 on the coil spring 35 side, and the bottom portion of the bottomed cylindrical portion 34a. be.
  • the coil spring 35 has a truncated cone shape as a whole from the igniter 50 side to the gas generating agent 31 side, the direction of the flame emitted from the igniter 50 is easily directed to the gas generating agent 31 side. be able to.
  • the AI agent 32 has an auto ignition (AI) function that automatically ignites without depending on the operation of the igniter 50. More specifically, since the AI agent 32 automatically ignites at a temperature lower than that of the gas generating agent 31, a fire or the like should occur in a vehicle or the like equipped with an airbag device or the like incorporating the gas generator 100. In this case, abnormal operation of the gas generator 100 due to external heating can be prevented.
  • a cover member 33 for holding the AI agent 32 is hermetically accommodated in the bottom portion of the closed container 34 on the side of the closing member 12 . Note that the cover member 33 is provided with a plurality of holes.
  • the partition member 36 includes a first tubular portion 36a, a contact portion 36b, and a second tubular portion 36c.
  • the first tubular portion 36a has an inner diameter larger than the inner diameter of the filter 41, and an opening is formed at the end on the igniter 50 side.
  • the end of the first tubular portion 36a on the side of the igniter 50 is in contact with the end 34c of the sealed container 34 so that the opening of the first tubular portion 36a faces the end 34c.
  • the contact portion 36b is provided on the filter 41 side of the first tubular portion 36a and has an annular shape that contacts the end portion of the filter 41 on the igniter 50 side.
  • a curved portion 36b1 for forming a hole in the central portion is continuously provided in the circumferential direction of the contact portion 36b.
  • the first tubular portion 36a and the contact portion 36b provide an operating space between the filter 41 and the closed container 34 when the end portion 34c of the closed container 34 bursts or splits when the gas generator 100 operates. enough to secure it.
  • the end portion 34c of the sealed container 34 is burst or split while stress is concentrated at the position 34c1. Therefore, when the gas generator 100 is activated, the end portion 34c of the sealed container 34 can be smoothly ruptured or split.
  • the second tubular portion 36c extends from the curved portion 36b1 of the contact portion 36b so as to be inserted into the inside of the filter 41.
  • the outer diameter of the second tubular portion 36c is equal to or smaller than the inner diameter of the filter 41 .
  • the second cylindrical portion 36c can be easily fitted inside the filter 41, so positioning of the partition member 36 during manufacturing of the gas generator 100 is facilitated. Therefore, it is possible to provide the gas generator 100 which is relatively easy to manufacture.
  • the second cylindrical portion 36c can protect the end portion of the filter 41 from breakage and/or bursting of the end portion 34c of the sealed container 34 during operation.
  • the outer peripheral wall portion of the first cylindrical portion 36a of the partition member 36 is arranged so as to contact the inner wall of the housing 10, and the contact portion 36b is arranged so as to cover the end portion of the filter 41. .
  • the generated gas can be bypassed from between the inner wall of the housing 10 and the outer peripheral portion of the filter 41 and prevented from leaking out to the gas ejection port 11 . That is, the partition member 36 can allow the gas generated on the sealed container 34 side to flow into the filter 41 side via the second cylindrical portion 36c.
  • the filter 41 is composed of a cylindrical member having a substantially cylindrical hollow portion 41a at its center.
  • a wire material made of metal such as stainless steel or iron steel, a wire material wound with a mesh material, or a material compacted by pressing is used.
  • a knitted wire mesh, a plain-woven wire mesh, or an aggregate of crimp-woven metal wires is used.
  • the filter 41 functions as a cooling means for cooling the gas generated in the sealed container 34 by removing high-temperature heat from the gas when it passes through the filter 41, and is contained in the gas.
  • a filter having a labyrinth-like channel formed by combining metal parts having a substantially cylindrical shape or a mortar shape may be used as a removing means for removing slag and the like.
  • a filter having a labyrinth-like channel formed by combining metal parts having a substantially cylindrical shape or a mortar shape may be used as a modified example of the filter 41.
  • the course of the working gas can be changed in various directions, so it is possible to cool the gas and remove slag.
  • the punching metal means a metal plate in which only openings are provided in a plate-like metal member (that is, no protrusions are provided around the openings), and the expanded metal is a plate-like metal member with, for example, It is a metal plate that is formed into a mesh by forming openings in the plate-like metal member by making cuts in a zigzag pattern and expanding the cuts. Even if such punched metal or expanded metal is used in place of the above-described knitted wire mesh, the same effects as those described in the above-described embodiment of the present invention can be obtained.
  • a filter composed of a laminate is configured by winding a single metal plate member, but the configuration of the filter is limited to this configuration. is not. That is, each layer may be composed of separate metal plate-shaped members and combined to form a filter composed of a laminate, or a part of a plurality of layers may be made of a single metal. , and the remaining layer is formed by winding another single metal plate member, and these are combined to form a filter consisting of a laminate. good too.
  • the collision is detected by collision detection means separately provided in the vehicle, and the igniter 50 is activated based on this. Operate.
  • the igniter 50 is actuated, the combustion of the igniter increases the pressure in the igniter 50 , which causes the tip of the squib cup 51 of the igniter 50 to rupture and the flame to flow from the tip of the squib cup 51 of the igniter 50 into the housing 10 . flows out to the closed container 34 side.
  • the flame that has flowed in this way splits the lid portion 34b of the sealed container 34, and further ignites and burns the gas generating agent 31 in the sealed container 34, generating a large amount of gas. Combustion of the gas generating agent 31 increases the pressure in the sealed container 34, and the generated gas causes stress to concentrate at the position 34c1.
  • the gas generated inside the closed container 34 ruptures or splits the end 34c of the closed container 34 on the side of the closing member 12, and passes through the inside of the partition member 36. It flows into the hollow portion 41a. Thereafter, the generated gas passes through the filter 41 and is ejected from the gas ejection port 11 to the outside of the gas generator 100. Since it passes through the filter 41, the generated gas reaches a predetermined temperature. Cooled.
  • the gas ejected from the gas ejection port 11 is guided inside the airbag to inflate and deploy the airbag.
  • the formation of the internal space by the first tubular portion 36a of the partition member 36 and the inner diameter of the filter 41 can be designed separately.
  • the rupture strength and the channel size (the inner diameter of the filter 41) can be designed separately. That is, the portion of the end portion 34c of the sealed container 34 where stress is concentrated can be easily adjusted by adjusting the thickness and the size of the inner diameter of the first cylindrical portion 36a of the partition member 36. can be easily adjusted in size. Further, by appropriately changing the thickness of the end portion 34c of the sealed container 34, the design of the tearing strength of the end portion 34c can be adjusted more easily than before. Therefore, it is possible to provide the gas generator 100 whose performance can be finely adjusted more easily than before.
  • the internal pressure inside the sealed container 34 during operation can be adjusted more easily than before (for example, more easily than before).
  • the inner diameter of the filter 41 can be made smaller than before (the thickness of the filter 41 in the radial direction can be made thicker than before). It is possible to provide the gas generator 100 that can improve the residue collection performance of the filter 41 .
  • the second tubular portion 36c is easily fitted inside the filter 41, positioning of the partition member 36 during manufacturing of the gas generator 100 is facilitated. Therefore, it is possible to provide the gas generator 100 which is relatively easy to manufacture.
  • the partition member 36 can protect the ends of the filter 41 from breakage and/or rupture of the ends 34c of the sealed container 34 during operation.
  • the gas generator of this modified example differs in that it uses a partition member 136 and a filter 141 instead of the partition member 36 and filter 41 of the above embodiment.
  • the partition member 136 includes a first tubular portion 136a, a contact portion 136b, and a second tubular portion 136c.
  • the first tubular portion 136a has an inner diameter larger than the inner diameter of the filter 141, and an opening is formed at the end on the igniter side.
  • the igniter-side end of the first tubular portion 136a is in contact with the end 134c of the sealed container 134 so that the opening of the first tubular portion 136a faces the end 134c.
  • the contact portion 136b is provided on the filter 141 side of the first cylindrical portion 136a, contacts the igniter-side end portion of the filter 141, and has a cross section that decreases in diameter from the first cylindrical portion 136a side to the filter 141 side. It is tapered (annular).
  • the first cylindrical portion 136a and the contact portion 136b provide a gap between the filter 141 and the closed container 134 when the end portion 134c of the closed container 134 is ruptured or ruptured during operation of the gas generator of this modification. can ensure sufficient working space.
  • the end portion 134c of the sealed container 134 bursts or splits with the stress concentrated on the position 134c1. Therefore, the end portion 134c of the sealed container 134 can be smoothly ruptured or split when the gas generator of this modified example is operated.
  • the second tubular portion 136c is formed continuously and integrally from the contact portion 136b, and is provided so as to be positioned inside the hollow portion 141a of the filter 141. As shown in FIG.
  • the partition member 36 in the above embodiment may be provided with only the first tubular portion 36a and the contact portion 36b, and without the second tubular portion 36c.
  • a housing 210 (housing precursor before crimping a holder or the like) shown in FIG. 4 may be used.
  • This housing 210 has a plurality of two types of gas jetting ports 211a and 211b with different diameters, respectively, and is provided at a position facing a filter (not shown) as in the above embodiment or modification.
  • the housing 210 has a region A provided with a plurality of gas ejection ports 211a and a region B provided with a plurality of gas ejection ports 211b.
  • the diameter of the gas ejection port 211b on the igniter side the lower side of the paper in FIG. 4
  • the gas ejection ports 211a, 211b are provided inside the above-described embodiment or modification. Filters (not shown) similar to the example can be used effectively evenly.
  • the method for reducing the diameter of the housing has been described by taking caulking as an example, but any processing method that can reduce the diameter of the housing may be used.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

[Problem] To obtain a gas generator in which cost is reduced by lessening weight and simplifying components to a greater extent than in the prior art. [Solution] A gas generator 100 has an elongated and approximately cylindrical outer shape, and includes: a housing 10; a holder 20 mounted onto one open end of the housing 10; a sealing member 12 mounted onto the other end of the housing 10 so as to seal the other open end of the housing 10; an airtight container 34 (tubular member) of tubular shape containing a gas-generating agent 31; a filter 41 that collects the residue of generated gas; and a partitioning member 36 provided between the filter 41 and the airtight container 34. The partitioning member 36 comprises a first tubular part, an annular abutting part, and a second tubular part. An opening is formed on the end of the first tubular part on an igniter 50 side, the inner diameter of the opening being greater than the inner diameter of the filter 41. The end of the first tubular part on the igniter 50 side abuts an end of the airtight container 34 such that the opening in the first tubular part faces the end.

Description

ガス発生器gas generator
 本発明は、自動車等に搭載される乗員保護装置としてのエアバッグ装置に組み込まれるガス発生器に関し、より特定的には、長尺円筒状の形状を有するいわゆるシリンダ型のガス発生器に関する。 The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted in an automobile or the like, and more particularly to a so-called cylinder-shaped gas generator having a long cylindrical shape.
 従来から、ガス発生剤を内包し、薄い厚みの仕切り板(中心部に穴が設けられている)を介してフィルタの一端部に接している密閉容器を、長尺円筒状のハウジング内に備えたガス発生器が公知となっている(例えば、下記特許文献1参照)。 Conventionally, a long cylindrical housing contains a sealed container that contains a gas generating agent and is in contact with one end of a filter through a thin partition plate (with a hole in the center). gas generators are known (see, for example, Patent Document 1 below).
特許第5455932号公報Japanese Patent No. 5455932
 上記特許文献1などのガス発生器においては、密閉容器のフィルタ側の端部の開裂強度(破裂圧)と、発生したガスのフィルタ内の流路の大きさ(以下、流路サイズ)とは、いずれもフィルタの内径又は仕切り板の中心部の穴の内径に依存することになる。すなわち、従来では、密閉容器のフィルタ側の端部の開裂強度と、流路サイズとは、別個に設計することができないものとなっていた。したがって、従来では、フィルタによる残渣捕集を含めたガス発生器の性能の微調整は容易ではなかった。 In the gas generator disclosed in Patent Document 1 and the like, the breaking strength (bursting pressure) of the end portion of the closed container on the filter side and the size of the flow path of the generated gas in the filter (hereinafter referred to as flow path size) are , will all depend on the inner diameter of the filter or the inner diameter of the hole in the center of the partition plate. That is, conventionally, the tearing strength of the filter-side end portion of the closed container and the channel size cannot be designed separately. Therefore, in the past, it was not easy to fine-tune the performance of the gas generator, including the residue collection by the filter.
 そこで、本発明は、密閉容器のフィルタ側の端部の開裂強度と、流路サイズとの設計が別個にでき、従来よりも性能の微調整が容易なガス発生器を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a gas generator in which the splitting strength of the filter-side end of the sealed container and the size of the flow path can be designed separately, and the performance can be finely adjusted more easily than before. do.
(1) 本発明のガス発生器は、長尺状のハウジングと、前記ハウジングの一端に設けられ、ガス発生剤を点火する点火器と、前記ハウジングの他端側に設けられたフィルタと、前記ハウジングの内部において前記点火器と前記フィルタとの間に設けられ、前記ガス発生剤を内包する筒状部材と、前記ハウジングの内部において前記筒状部材と前記フィルタとの間に設けられ、前記点火器側の端部に開口部が形成されている第1筒状部と、前記第1筒状部の前記フィルタ側に設けられ、前記フィルタの前記点火器側の端部に当接する環状の当接部と、を有した仕切り部材と、を備え、前記第1筒状部は、内径が前記フィルタの内径よりも大きく、前記開口部が前記筒状部材の前記フィルタ側の端部に当接しており、前記当接部の中央部には、孔部が形成されていることを特徴とする。 (1) The gas generator of the present invention comprises a long housing, an igniter provided at one end of the housing for igniting a gas generating agent, a filter provided at the other end of the housing, and the A tubular member provided inside the housing between the igniter and the filter and containing the gas generating agent, and a tubular member provided inside the housing between the tubular member and the filter, wherein the ignition A first tubular portion having an opening formed at the end on the device side, and an annular abutment provided on the filter side of the first tubular portion and abutting on the igniter-side end of the filter. and a partition member having a contact portion, wherein the first tubular portion has an inner diameter larger than the inner diameter of the filter, and the opening abuts the filter-side end of the tubular member. A hole is formed in the central portion of the contact portion.
(2) 上記(1)のガス発生器において、前記仕切り部材は、前記孔部の内周縁から延設され、外径が前記フィルタの内径以下である第2筒状部をさらに備え、前記第2筒状部は、前記フィルタの内部に挿入されていることが好ましい。 (2) In the gas generator of (1) above, the partition member further includes a second cylindrical portion extending from the inner peripheral edge of the hole and having an outer diameter equal to or less than the inner diameter of the filter. It is preferable that the two tubular portions are inserted inside the filter.
(3) 別の観点として、上記(1)のガス発生器において、前記当接部は、前記第1筒状部から延設され、断面が前記第1筒状部側から前記フィルタ側にかけて縮径するテーパー形状のものであって、少なくとも一部が前記フィルタの内部に挿入されているものであってもよい。 (3) From another point of view, in the gas generator of (1) above, the contact portion extends from the first cylindrical portion and has a cross section that shrinks from the first cylindrical portion side to the filter side. It may have a tapered shape with a diameter and at least a portion of which is inserted inside the filter.
 本発明によれば、密閉容器のフィルタ側の端部の開裂強度と、流路サイズとの設計が別個にでき、性能の調整が容易なガス発生器を提供することができる。 According to the present invention, it is possible to design the splitting strength of the end portion of the closed container on the filter side and the flow channel size separately, and to provide a gas generator whose performance can be easily adjusted.
断面で表した本発明の実施形態に係るガス発生器の内部構造を示す模式図(一部省略)である。It is a schematic diagram (partially omitted) which shows the internal structure of the gas generator which concerns on embodiment of this invention represented by the cross section. 図1の仕切り部材付近を拡大して示した模式図である。FIG. 2 is a schematic diagram showing an enlarged vicinity of a partition member in FIG. 1; 変形例に係るガス発生器の仕切り部材付近を拡大して示した模式図である。It is the schematic diagram which expanded and showed the partition member vicinity of the gas generator which concerns on a modification. 他の変形例に係るガス発生器に用いられるハウジングを示した模式断面図である。FIG. 5 is a schematic cross-sectional view showing a housing used in a gas generator according to another modified example;
 以下、図1を参照して、本発明の実施形態に係るシリンダ型のガス発生器の内部構造について説明する。 The internal structure of the cylinder-type gas generator according to the embodiment of the present invention will be described below with reference to FIG.
(ガス発生器100の構成)
 ガス発生器100は、長尺略円柱状の外形を有しており、ハウジング10と、ハウジング10の一方の開口端に取付けられているホルダ20と、ハウジング10の他方の開口端を閉塞するようにハウジング10の他端部に取付けられている閉塞部材12と、ガス発生剤31を内包する筒状の密閉容器34(筒状部材)と、発生したガスの残渣を捕集するフィルタ41と、フィルタ41と密閉容器34との間に設けられている仕切り部材36と、を含んでいる。
(Configuration of gas generator 100)
The gas generator 100 has a long, substantially cylindrical outer shape, and includes a housing 10 , a holder 20 attached to one open end of the housing 10 , and a holder 20 that closes the other open end of the housing 10 . a closing member 12 attached to the other end of the housing 10, a cylindrical sealed container 34 (cylindrical member) containing the gas generating agent 31, a filter 41 for collecting residue of the generated gas, and a partition member 36 provided between the filter 41 and the sealed container 34 .
 ハウジング10は、周壁10a、10eを有し、軸方向の両端に開口を有する長尺の円筒状の部材からなる。閉塞部材12は、閉塞部材12の周面に周方向に向かって延びるように形成された環状溝部13を有している。また、ハウジング10の閉塞部材12が取付けられた側の端部近傍の周壁には、ガス噴出口11が設けられている。このガス噴出口11は、ガス発生器100の内部において発生したガスを外部に噴出するための孔であり、ハウジング10の周方向及び軸方向に沿って複数個設けられている。 The housing 10 is a long cylindrical member having peripheral walls 10a and 10e and openings at both ends in the axial direction. The closing member 12 has an annular groove 13 formed on the peripheral surface of the closing member 12 so as to extend in the circumferential direction. A gas ejection port 11 is provided in the peripheral wall near the end of the housing 10 on the side where the closing member 12 is attached. The gas ejection port 11 is a hole for ejecting gas generated inside the gas generator 100 to the outside, and is provided in plural along the circumferential direction and the axial direction of the housing 10 .
 また、閉塞部材12は、ステンレス鋼、鉄鋼、アルミニウム合金、又はステンレス合金等の金属製のものである。そして、図1に示したように、ハウジング10の一方の開口端に閉塞部材12の一部が内挿された状態で、閉塞部材12の周面の環状溝部13に対応する部分のハウジング10の周壁10aを径方向内側に縮径させて(かしめて)、当該環状溝部13に係合させることにより、ハウジング10に対する閉塞部材12のかしめ固定が行なわれている。 Also, the closing member 12 is made of metal such as stainless steel, steel, aluminum alloy, or stainless alloy. Then, as shown in FIG. 1, with a part of the closing member 12 inserted into one open end of the housing 10, a portion of the housing 10 corresponding to the annular groove 13 on the peripheral surface of the closing member 12 is removed. The closing member 12 is fixed to the housing 10 by caulking the peripheral wall 10 a by reducing its diameter (caulking) radially inward and engaging it with the annular groove 13 .
 ホルダ20は、ステンレス鋼、鉄鋼、アルミニウム合金、又はステンレス合金等の金属製であって、点火器50が嵌合するテーパー形状の嵌合部23と、外周面に周方向に向かって延びるように形成されたかしめ固定のための環状溝部22と、点火器50の保持位置と反対側において、点火器50に通電するための雌型コネクタ(不図示)が嵌合可能な嵌合部21と、を有している。なお、ホルダ20の外周面に設けられた環状溝部22に対応する部分のハウジング10の周壁10eを径方向内側に縮径させて(かしめて)当該環状溝部22に係合させることにより、ハウジング10に対するホルダ20のかしめ固定が行なわれている。 The holder 20 is made of metal such as stainless steel, iron steel, aluminum alloy, or stainless alloy, and has a tapered fitting portion 23 to which the igniter 50 is fitted, and a fitting portion 23 extending circumferentially on the outer peripheral surface. An annular groove portion 22 formed for crimping and fixing, a fitting portion 21 capable of fitting a female connector (not shown) for energizing the igniter 50 on the side opposite to the holding position of the igniter 50, have. The peripheral wall 10 e of the housing 10 at a portion corresponding to the annular groove 22 provided on the outer peripheral surface of the holder 20 is radially contracted (crimped) to engage with the annular groove 22 . The holder 20 is fixed by caulking.
 なお、上述した通り、ホルダ20の嵌合部21には、雌型コネクタが形成される。この雌型コネクタは、ガス発生器100とは別途設けられる衝突検知手段からの信号を伝達するハーネスの雄型コネクタが接続される部位である。雌型コネクタには、リテーナ(不図示)が取付けられる。このリテーナは、ガス発生器100の搬送時等において静電放電等によってシリンダ型のガス発生器100が誤動作することを防止するために取付けられるものであり、エアバッグ装置への組付け段階においてハーネスの雄型コネクタが雌型コネクタに挿し込まれることによってその端子ピン52への接触が解除されるものである。 In addition, as described above, the fitting portion 21 of the holder 20 is formed with a female connector. This female connector is a portion to which a male connector of a harness for transmitting a signal from collision detection means provided separately from the gas generator 100 is connected. A retainer (not shown) is attached to the female connector. This retainer is attached to prevent the cylindrical gas generator 100 from malfunctioning due to electrostatic discharge or the like when the gas generator 100 is transported. The contact with the terminal pin 52 is released by inserting the male connector into the female connector.
 図1に示すように、ハウジング10の軸方向の一端部(すなわち、ホルダ20寄りの部分)には、ガス発生剤31の点火手段としての点火器50が配置されている。なお、点火器50及び点火器50を固定するホルダ20は、後述する粒状のガス発生剤31を燃焼させるための火炎を発生させる点火手段としての機能を有している。 As shown in FIG. 1, an igniter 50 as ignition means for the gas generating agent 31 is arranged at one axial end of the housing 10 (that is, a portion near the holder 20). The igniter 50 and the holder 20 for fixing the igniter 50 function as ignition means for generating a flame for burning the granular gas generating agent 31, which will be described later.
 図1に示すように、点火器50は、ホルダ20の嵌合部23に内挿された状態で、後述する略筒状部材53とともに保持されている。点火器50は、より具体的には、一対の端子ピン52を挿通かつ保持する基枠と、基枠上に取付けられたスクイブカップ51(カップ状部材)とを備えており、スクイブカップ51内に挿入された端子ピン52の先端を連結するように抵抗体(ブリッジワイヤ)が取付けられ、この抵抗体を取り囲むように又はこの抵抗体に接するようにスクイブカップ51内に点火薬が充填されている。抵抗体としては一般にニクロム線等が利用され、点火薬としては一般にZPP(ジルコニウム・過塩素酸カリウム)、ZWPP(ジルコニウム・タングステン・過塩素酸カリウム)、鉛トリシネート等が利用される。なお、スクイブカップ51内には、点火薬だけでなくさらに伝火薬を充填してもよいが、点火薬と同時に配置され得る伝火薬としては、ホウ素/硝酸カリウム等に代表される金属/酸化剤からなる組成物、水素化チタン/過塩素酸カリウムからなる組成物、又は、ホウ素/5-アミノテトラゾール/硝酸カリウム/三酸化モリブデンからなる組成物等が用いられる。 As shown in FIG. 1, the igniter 50 is inserted into the fitting portion 23 of the holder 20 and held together with a substantially cylindrical member 53, which will be described later. More specifically, the igniter 50 includes a base frame through which a pair of terminal pins 52 are inserted and held, and a squib cup 51 (cup-shaped member) mounted on the base frame. A resistor (bridge wire) is attached so as to connect the tips of the terminal pins 52 inserted into the squib cup 51 so as to surround or contact the resistor. there is A nichrome wire or the like is generally used as the resistor, and ZPP (zirconium/potassium perchlorate), ZWPP (zirconium/tungsten/potassium perchlorate), lead tricinate, or the like is generally used as the igniter. In addition to the ignition charge, the squib cup 51 may be filled with a transfer charge as well. a composition consisting of titanium hydride/potassium perchlorate, or a composition consisting of boron/5-aminotetrazole/potassium nitrate/molybdenum trioxide.
 衝突を検知した際には、端子ピン52を介して抵抗体に所定量の電流が流れる。抵抗体に所定量の電流が流れることにより、抵抗体においてジュール熱が発生し、この熱を受けて点火薬が燃焼を開始する。燃焼により生じた高温の火炎は、点火薬を収納しているスクイブカップ51を破裂させる。抵抗体に電流が流れてから点火器50が作動するまでの時間は、抵抗体にニクロム線を利用した場合には2ミリ秒以下である。 When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 52 . When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the igniter starts burning upon receiving this heat. A high-temperature flame generated by the combustion ruptures the squib cup 51 containing the ignition charge. The time from when the current flows through the resistor until the igniter 50 is activated is 2 milliseconds or less when the nichrome wire is used as the resistor.
 また、スクイブカップ51は、一般に金属製又は樹脂製である。なお、スクイブカップ51の周壁部のうち先端部付近以外を覆う略筒状部材53が、点火器50とともに、かしめ部24によってホルダ20にかしめ固定されている。ここで、略筒状部材53は、作動時に点火器50において発生する火炎の方向を密閉容器34側に向ける指向性部材である。また、スクイブカップ51及び略筒状部材53の周囲には、ハウジング10の内壁に沿って、巻きバネ54が設けられている。この巻きバネ54は、一端部が後述する密閉容器34の蓋部34bの端部に当接し、他端部がホルダ20の内部側の端部に当接している。 Also, the squib cup 51 is generally made of metal or resin. A substantially cylindrical member 53 that covers the peripheral wall portion of the squib cup 51 except for the vicinity of the tip portion is crimped and fixed to the holder 20 by the crimp portion 24 together with the igniter 50 . Here, the substantially cylindrical member 53 is a directional member that directs the direction of the flame generated in the igniter 50 to the sealed container 34 side during operation. A coil spring 54 is provided along the inner wall of the housing 10 around the squib cup 51 and the substantially cylindrical member 53 . One end of the coil spring 54 abuts an end of the lid portion 34 b of the closed container 34 , which will be described later, and the other end abuts an inner end of the holder 20 .
 図1に示すように、ハウジング10の内部空間には、ガス発生剤31などが密封された筒状の密閉容器34と、フィルタ41とが、ハウジング10の軸方向に並列して装填されている。密閉容器34は、アルミニウムなどの金属製であることが好ましい。 As shown in FIG. 1, in the inner space of the housing 10, a tubular sealed container 34 in which a gas generating agent 31 and the like are sealed, and a filter 41 are loaded in parallel in the axial direction of the housing 10. . The sealed container 34 is preferably made of metal such as aluminum.
 密閉容器34は、有底筒状部34aと蓋部34bとを有し、内部には、ガス発生剤31と、巻きバネ35と、AI剤32と、カバー部材33と、仕切り部材36と、が配設されている。また、有底筒状部34aは、底部となる端部34cを有している。なお、蓋部34bと点火器50の先端部とは、所定距離を有するように離間して配設されている。これにより、点火器50が作動する場合において、スクイブカップ51が開裂しやすくなっている。また、端部34cは、厚み又は/及び材質を変化させることによって、作動時に破裂又は開裂のいずれかが発生するように調整することも可能である。 The sealed container 34 has a bottomed cylindrical portion 34a and a lid portion 34b, and contains therein a gas generating agent 31, a coil spring 35, an AI agent 32, a cover member 33, a partition member 36, are arranged. In addition, the bottomed tubular portion 34a has an end portion 34c that serves as a bottom portion. Note that the lid portion 34b and the tip portion of the igniter 50 are spaced apart from each other by a predetermined distance. This makes it easier for the squib cup 51 to split when the igniter 50 is activated. End portion 34c may also be tailored to either rupture or split upon actuation by varying thickness and/or material.
 ガス発生剤31は、点火器50によって点火されることによって生じた火炎によって着火され、燃焼することによってガスを発生させる一体成型物である。また、ガス発生剤31は、一般に燃料と酸化剤と添加剤とを含む成型体として形成される。燃料としては、たとえばトリアゾール誘導体、テトラゾール誘導体、グアニジン誘導体、アゾジカルボンアミド誘導体、ヒドラジン誘導体等又はこれらの組み合わせが利用される。具体的には、たとえばニトログアニジン、硝酸グアニジン、シアノグアニジン、5-アミノテトラゾール等が好適に利用される。また、酸化剤としては、たとえば、塩基性硝酸銅や塩基性炭酸銅等の塩基性金属水酸化物、過塩素酸アンモニウム又は過塩素酸カリウム等の過塩素酸塩、アルカリ金属、アルカリ土類金属、遷移金属、アンモニアから選ばれたカチオンを含む硝酸塩等が利用される。硝酸塩としては、たとえば硝酸ナトリウム、硝酸カリウム等が好適に利用される。また、添加剤としては、バインダ、スラグ形成剤、又は燃焼調整剤等が挙げられる。バインダとしては、たとえばヒドロキシプロピレンメチルセルロース等のセルロース誘導体、カルボキシメチルセルロースの金属塩、ステアリン酸塩等の有機バインダ、合成ヒドロキシタルサイト、酸性白土等の無機バインダが好適に利用可能である。スラグ形成剤としては窒化珪素、シリカ、酸性白土等が好適に利用可能である。また、燃焼調整剤としては、金属酸化物、フェロシリコン、活性炭、グラファイト等が好適に利用可能である。 The gas generating agent 31 is an integrally molded product that is ignited by the flame generated by the igniter 50 and burns to generate gas. Also, the gas generating agent 31 is generally formed as a molded body containing fuel, oxidant and 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, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used. Examples of oxidizing agents include basic metal hydroxides such as basic copper nitrate and basic copper carbonate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals and alkaline earth metals. , transition metals, and nitrates containing cations selected from ammonia are used. As nitrates, for example, sodium nitrate, potassium nitrate and the like are preferably used. Additives include binders, slag forming agents, combustion modifiers, and the like. Suitable binders include cellulose derivatives such as hydroxypropylene methyl cellulose, organic binders such as metal salts of carboxymethyl cellulose and stearates, and inorganic binders such as synthetic hydroxytalcite and acid clay. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Metal oxides, ferrosilicon, activated carbon, graphite and the like can be suitably used as combustion modifiers.
 巻きバネ35は、図1に示したように、外観全体として円錐台形状に相似するように、らせん状に巻き回して形成されている。また、巻きバネ35は、一端部が蓋部34bに当接しているとともに、渦巻状に形成されている他端部がガス発生剤31に当接して、ガス発生剤31に弾性力を付勢するように設けられている。この付勢により、ガス発生剤31は、密閉容器34内において、巻きバネ35と、フィルタ41の巻きバネ35側の端部及び有底筒状部34aの底部とに挟まれるようにして固定される。また、巻きバネ35は、全体として点火器50側からガス発生剤31側にかけて円錐台形状となっていることで、点火器50から放出された火炎の方向をガス発生剤31側に向けやすくすることができる。 As shown in FIG. 1, the coil spring 35 is spirally wound so that the overall appearance resembles a truncated cone. One end of the coil spring 35 is in contact with the lid portion 34b, and the other end of the spiral spring 35 is in contact with the gas generating agent 31, thereby urging the gas generating agent 31 with an elastic force. It is designed to By this urging, the gas generating agent 31 is fixed in the sealed container 34 so as to be sandwiched between the coil spring 35, the end portion of the filter 41 on the coil spring 35 side, and the bottom portion of the bottomed cylindrical portion 34a. be. In addition, since the coil spring 35 has a truncated cone shape as a whole from the igniter 50 side to the gas generating agent 31 side, the direction of the flame emitted from the igniter 50 is easily directed to the gas generating agent 31 side. be able to.
 AI剤32は、点火器50の作動によらずに自動発火するオートイグニッション(AI)機能を有しているものである。より詳細に説明すると、AI剤32は、ガス発生剤31よりも低い温度で自動発火するので、ガス発生器100が組み込まれたエアバッグ装置などが装備された車両等において万が一火災等が発生した場合、外部から加熱されることによるガス発生器100の異常動作の誘発を防ぐことができるものである。また、密閉容器34の閉塞部材12側の底部には、AI剤32を保持するカバー部材33が密封収容されている。なお、カバー部材33には、複数の穴が設けられている。 The AI agent 32 has an auto ignition (AI) function that automatically ignites without depending on the operation of the igniter 50. More specifically, since the AI agent 32 automatically ignites at a temperature lower than that of the gas generating agent 31, a fire or the like should occur in a vehicle or the like equipped with an airbag device or the like incorporating the gas generator 100. In this case, abnormal operation of the gas generator 100 due to external heating can be prevented. A cover member 33 for holding the AI agent 32 is hermetically accommodated in the bottom portion of the closed container 34 on the side of the closing member 12 . Note that the cover member 33 is provided with a plurality of holes.
 仕切り部材36は、図2に示したように、第1筒状部36aと、当接部36bと、第2筒状部36cと、を備えている。第1筒状部36aは、内径がフィルタ41の内径よりも大きく、点火器50側の端部に開口部が形成されている。また、第1筒状部36aの開口部が端部34cに面するように、第1筒状部36aの点火器50側の端部が、密閉容器34の端部34cに当接している。当接部36bは、第1筒状部36aのフィルタ41側に設けられ、フィルタ41の点火器50側の端部に当接する環状のものである。また、当接部36bには、中央部に孔部を形成するための湾曲部36b1が周方向に連続して設けられている。第1筒状部36aと当接部36bとにより、フィルタ41と密閉容器34との間に、ガス発生器100の作動時における密閉容器34の端部34cの破裂時又は開裂時の作動空間を十分に確保できる。また、ガス発生器100の作動時には、位置34c1に応力が集中した状態で、密閉容器34の端部34cが破裂又は開裂するようになっている。したがって、ガス発生器100の作動時における密閉容器34の端部34cの破裂又は開裂をスムーズに行うことができる。 The partition member 36, as shown in FIG. 2, includes a first tubular portion 36a, a contact portion 36b, and a second tubular portion 36c. The first tubular portion 36a has an inner diameter larger than the inner diameter of the filter 41, and an opening is formed at the end on the igniter 50 side. The end of the first tubular portion 36a on the side of the igniter 50 is in contact with the end 34c of the sealed container 34 so that the opening of the first tubular portion 36a faces the end 34c. The contact portion 36b is provided on the filter 41 side of the first tubular portion 36a and has an annular shape that contacts the end portion of the filter 41 on the igniter 50 side. In addition, a curved portion 36b1 for forming a hole in the central portion is continuously provided in the circumferential direction of the contact portion 36b. The first tubular portion 36a and the contact portion 36b provide an operating space between the filter 41 and the closed container 34 when the end portion 34c of the closed container 34 bursts or splits when the gas generator 100 operates. enough to secure it. Further, when the gas generator 100 is activated, the end portion 34c of the sealed container 34 is burst or split while stress is concentrated at the position 34c1. Therefore, when the gas generator 100 is activated, the end portion 34c of the sealed container 34 can be smoothly ruptured or split.
 第2筒状部36cは、当接部36bの湾曲部36b1からフィルタ41内部に挿入されるように延設されている。また、第2筒状部36cの外径は、フィルタ41の内径以下となっている。これにより、第2筒状部36cをフィルタ41の内部に嵌合させやすいので、ガス発生器100の製造時の仕切り部材36の位置決めが容易となる。したがって、製造が比較的簡便なガス発生器100を提供できる。また、第2筒状部36cによって、作動時における密閉容器34の端部34cの破断又は/及び破裂から、フィルタ41の端部を保護することができる。 The second tubular portion 36c extends from the curved portion 36b1 of the contact portion 36b so as to be inserted into the inside of the filter 41. In addition, the outer diameter of the second tubular portion 36c is equal to or smaller than the inner diameter of the filter 41 . As a result, the second cylindrical portion 36c can be easily fitted inside the filter 41, so positioning of the partition member 36 during manufacturing of the gas generator 100 is facilitated. Therefore, it is possible to provide the gas generator 100 which is relatively easy to manufacture. In addition, the second cylindrical portion 36c can protect the end portion of the filter 41 from breakage and/or bursting of the end portion 34c of the sealed container 34 during operation.
 また、仕切り部材36の第1筒状部36aの外周壁部は、ハウジング10の内壁に当接するように配設され、当接部36bはフィルタ41の端部を覆うように配設されている。これにより、発生したガスがハウジング10の内壁とフィルタ41の外周部との間からバイパスして、ガス噴出口11に漏れ出ないようにすることができる。すなわち、仕切り部材36は、密閉容器34側で発生したガスを、第2筒状部36cを介してフィルタ41側へ流入させることができる。 The outer peripheral wall portion of the first cylindrical portion 36a of the partition member 36 is arranged so as to contact the inner wall of the housing 10, and the contact portion 36b is arranged so as to cover the end portion of the filter 41. . As a result, the generated gas can be bypassed from between the inner wall of the housing 10 and the outer peripheral portion of the filter 41 and prevented from leaking out to the gas ejection port 11 . That is, the partition member 36 can allow the gas generated on the sealed container 34 side to flow into the filter 41 side via the second cylindrical portion 36c.
 フィルタ41は、中心に略円柱状の中空部41aを有した円筒状の部材からなるものである。なお、上述の円筒状の部材からなるフィルタ41を利用することで、作動時において流動する作動ガスの流動抵抗が低く抑えられ、効率的なガスの流動が可能である。フィルタ41は、たとえばステンレス鋼或いは鉄鋼等の金属からなる線材、又は、網材を巻き回したもの或いはプレス加工することによって押し固めたもの等が利用される。具体的には、メリヤス編みの金網、平織りの金網、又はクリンプ織りの金属線材の集合体等が利用される。フィルタ41は、密閉容器34内にて発生したガスがこのフィルタ41中を通過する際に、ガスが有する高温の熱を奪い取ることによってガスを冷却する冷却手段として機能するとともに、ガス中に含まれるスラグ等を除去する除去手段としても機能する。ここで、フィルタ41の一変形例として、金属からなる略円筒状又はすり鉢状の部品を組み合わせて形成した迷路状流路を有したフィルタを使用してもよい。これにより、作動ガスの進路を様々な方向に変更させることができるので、ガスの冷却及びスラグの除去を行うことが可能である。 The filter 41 is composed of a cylindrical member having a substantially cylindrical hollow portion 41a at its center. By using the filter 41 made of the cylindrical member described above, the flow resistance of the working gas that flows during operation is suppressed to a low level, and efficient gas flow is possible. For the filter 41, a wire material made of metal such as stainless steel or iron steel, a wire material wound with a mesh material, or a material compacted by pressing is used. Specifically, a knitted wire mesh, a plain-woven wire mesh, or an aggregate of crimp-woven metal wires is used. The filter 41 functions as a cooling means for cooling the gas generated in the sealed container 34 by removing high-temperature heat from the gas when it passes through the filter 41, and is contained in the gas. It also functions as a removing means for removing slag and the like. Here, as a modified example of the filter 41, a filter having a labyrinth-like channel formed by combining metal parts having a substantially cylindrical shape or a mortar shape may be used. As a result, the course of the working gas can be changed in various directions, so it is possible to cool the gas and remove slag.
 また、上述した本発明の実施形態においては、フィルタとして、いわゆるメリヤス編みの金網で製作されたものを利用した場合を例示したが、これに代えてパンチングメタルを巻き回すことで製作されたものを利用することや、エキスパンドメタルを巻き回すことで製作されものを利用することも可能である。ここで、パンチングメタルとは、板状金属部材に開口部のみを設けた(すなわち開口部の周縁に突起部を設けない)金属板のことであり、エキスパンドメタルとは、板状金属部材にたとえば千鳥状に切れ目を入れるとともにこれを押し広げることにより、当該板状金属部材に開口部を設けて網目状にした金属板のことである。このようなパンチングメタルやエキスパンドメタルを上述したメリヤス編みの金網に代えて使用した場合にも、上述した本発明の実施形態において説明した効果と同様の効果を得ることができる。 Further, in the above-described embodiment of the present invention, the case of using a so-called knitted wire net as a filter was exemplified. It is also possible to use a product manufactured by winding expanded metal. Here, the punching metal means a metal plate in which only openings are provided in a plate-like metal member (that is, no protrusions are provided around the openings), and the expanded metal is a plate-like metal member with, for example, It is a metal plate that is formed into a mesh by forming openings in the plate-like metal member by making cuts in a zigzag pattern and expanding the cuts. Even if such punched metal or expanded metal is used in place of the above-described knitted wire mesh, the same effects as those described in the above-described embodiment of the present invention can be obtained.
 また、上述したパンチングメタルやエキスパンドメタルにおいては、単一の金属製の板状部材を巻き回すことで積層体からなるフィルタが構成されているが、フィルタの構成は、当該構成に限定されるものではない。すなわち、それぞれの層が別々の金属製の板状部材にて構成されてこれを組み合わせることで積層体からなるフィルタが構成されていてもよいし、複数の層の一部が単一の金属製の板状部材巻き回すことで形成されるとともに、残る層が別の単一の金属製の板状部材巻き回すことで形成され、これらが組み合わされることで積層体からなるフィルタが構成されていてもよい。 In addition, in the above-described perforated metal and expanded metal, a filter composed of a laminate is configured by winding a single metal plate member, but the configuration of the filter is limited to this configuration. is not. That is, each layer may be composed of separate metal plate-shaped members and combined to form a filter composed of a laminate, or a part of a plurality of layers may be made of a single metal. , and the remaining layer is formed by winding another single metal plate member, and these are combined to form a filter consisting of a laminate. good too.
 次に、以上において説明したガス発生器100の作動時における動作について説明する。本実施形態におけるガス発生器100が組み込まれたエアバッグ装置が搭載された車両が衝突した場合には、車両に別途設けられた衝突検知手段によって衝突が検知され、これに基づいて点火器50が作動する。点火器50が作動すると、点火薬の燃焼によって点火器50内の圧力が上昇し、これによって点火器50のスクイブカップ51先端が破裂し、火炎が点火器50のスクイブカップ51先端からハウジング10内部の密閉容器34側へと流出する。 Next, the operation during operation of the gas generator 100 described above will be described. When a vehicle equipped with an airbag device incorporating the gas generator 100 according to the present embodiment collides, the collision is detected by collision detection means separately provided in the vehicle, and the igniter 50 is activated based on this. Operate. When the igniter 50 is actuated, the combustion of the igniter increases the pressure in the igniter 50 , which causes the tip of the squib cup 51 of the igniter 50 to rupture and the flame to flow from the tip of the squib cup 51 of the igniter 50 into the housing 10 . flows out to the closed container 34 side.
 このようにして流れ込んだ火炎により、密閉容器34の蓋部34bを開裂させて、さらに密閉容器34内におけるガス発生剤31を着火して燃焼させ、多量のガスを発生させる。このガス発生剤31の燃焼により、密閉容器34内の圧力が上昇し、発生したガスによって、位置34c1に応力が集中した状態となる。そして、密閉容器34内の圧力が所定以上になると、密閉容器34内で発生したガスは、密閉容器34の閉塞部材12側の端部34cを破裂又は開裂させ、仕切り部材36の内部を介して中空部41aに流入する。その後、発生したガスは、フィルタ41を経由してガス噴出口11からガス発生器100の外部へと噴出されることになるが、フィルタ41を経由するので、発生したガスは所定の温度にまで冷却される。そして、ガス噴出口11から噴出されたガスは、エアバッグの内部に導かれてエアバッグを膨張・展開させる。 The flame that has flowed in this way splits the lid portion 34b of the sealed container 34, and further ignites and burns the gas generating agent 31 in the sealed container 34, generating a large amount of gas. Combustion of the gas generating agent 31 increases the pressure in the sealed container 34, and the generated gas causes stress to concentrate at the position 34c1. When the pressure inside the closed container 34 reaches a predetermined level or higher, the gas generated inside the closed container 34 ruptures or splits the end 34c of the closed container 34 on the side of the closing member 12, and passes through the inside of the partition member 36. It flows into the hollow portion 41a. Thereafter, the generated gas passes through the filter 41 and is ejected from the gas ejection port 11 to the outside of the gas generator 100. Since it passes through the filter 41, the generated gas reaches a predetermined temperature. Cooled. The gas ejected from the gas ejection port 11 is guided inside the airbag to inflate and deploy the airbag.
(ガス発生器100の主な特徴)
 本実施形態によれば、仕切り部材36の第1筒状部36aによる内部空間の形成と、フィルタ41の内径とを別個に設計することができることから、密閉容器34のフィルタ側の端部34cの開裂強度と、流路サイズ(フィルタ41の内径)とが別個に設計できる。すなわち、密閉容器34の端部34cのうち応力集中する部位を、仕切り部材36の第1筒状部36aの厚み及び内径のサイズによって容易に調整できるとともに、これとは別個に、フィルタ41の内径のサイズを容易に調整できる。また、密閉容器34の端部34cの厚みを適宜変更することで、端部34cの開裂強度の設計についても従来よりも容易に調整できる。したがって、従来よりも性能の微調整が容易なガス発生器100を提供できる。すなわち、たとえば、作動時の密閉容器34内の内圧を従来よりも容易に調整(たとえば、従来よりも容易に低減)することができる。また、ハウジング10の長さを変えずに、フィルタ41内径を従来よりも小さくすることもできる(フィルタ41の径方向の厚みを従来よりも厚くできる)ので、従来と同じ大きさのまま、従来よりもフィルタ41の残渣捕集性を高めることができるガス発生器100を提供できる。
(Main features of gas generator 100)
According to the present embodiment, the formation of the internal space by the first tubular portion 36a of the partition member 36 and the inner diameter of the filter 41 can be designed separately. The rupture strength and the channel size (the inner diameter of the filter 41) can be designed separately. That is, the portion of the end portion 34c of the sealed container 34 where stress is concentrated can be easily adjusted by adjusting the thickness and the size of the inner diameter of the first cylindrical portion 36a of the partition member 36. can be easily adjusted in size. Further, by appropriately changing the thickness of the end portion 34c of the sealed container 34, the design of the tearing strength of the end portion 34c can be adjusted more easily than before. Therefore, it is possible to provide the gas generator 100 whose performance can be finely adjusted more easily than before. That is, for example, the internal pressure inside the sealed container 34 during operation can be adjusted more easily than before (for example, more easily than before). In addition, without changing the length of the housing 10, the inner diameter of the filter 41 can be made smaller than before (the thickness of the filter 41 in the radial direction can be made thicker than before). It is possible to provide the gas generator 100 that can improve the residue collection performance of the filter 41 .
 また、端部34cについて、厚み又は/及び材質を変化させることによって、作動時に破裂又は開裂のいずれかが発生するように調整することも可能である。 Also, by changing the thickness and/or the material of the end portion 34c, it is possible to adjust so that either bursting or splitting occurs during operation.
 また、第2筒状部36cをフィルタ41の内部に嵌合させやすいので、ガス発生器100の製造時の仕切り部材36の位置決めが容易となる。したがって、製造が比較的簡便なガス発生器100を提供できる。 In addition, since the second tubular portion 36c is easily fitted inside the filter 41, positioning of the partition member 36 during manufacturing of the gas generator 100 is facilitated. Therefore, it is possible to provide the gas generator 100 which is relatively easy to manufacture.
 また、仕切り部材36によって、作動時における密閉容器34の端部34cの破断又は/及び破裂から、フィルタ41の端部を保護することができる。 In addition, the partition member 36 can protect the ends of the filter 41 from breakage and/or rupture of the ends 34c of the sealed container 34 during operation.
 以上、本発明の実施形態について図面に基づいて説明したが、具体的な構成は、これらの実施形態に限定されるものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれる。 Although the embodiments of the present invention have been described above based on the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.
 たとえば、上記実施形態の変形例として、図3に示した構成を有したガス発生器が挙げられる。以下、具体的に説明するが、上記実施形態と同様の箇所には下二桁が同じ符号を付し、説明を省略することがある。また、本変形例において、特に説明していない部位は、上記実施形態と同様である。 For example, as a modification of the above embodiment, there is a gas generator having the configuration shown in FIG. Hereinafter, a specific description will be given, but portions that are the same as those in the above-described embodiment are denoted by the same numerals with the same last two digits, and the description may be omitted. Also, in this modified example, parts that are not particularly described are the same as those in the above-described embodiment.
 本変形例のガス発生器は、上記実施形態の仕切り部材36及びフィルタ41の代わりに、仕切り部材136及びフィルタ141を用いている点で異なっている。 The gas generator of this modified example differs in that it uses a partition member 136 and a filter 141 instead of the partition member 36 and filter 41 of the above embodiment.
 仕切り部材136は、図3に示したように、第1筒状部136aと、当接部136bと、第2筒状部136cと、を備えている。第1筒状部136aは、内径がフィルタ141の内径よりも大きく、点火器側の端部に開口部が形成されている。また、第1筒状部136aの開口部が端部134cに面するように、第1筒状部136aの点火器側の端部が、密閉容器134の端部134cに当接している。当接部136bは、第1筒状部136aのフィルタ141側に設けられ、フィルタ141の点火器側の端部に当接する、断面が第1筒状部136a側からフィルタ141側にかけて縮径するテーパー形状(環状)のものである。これら第1筒状部136aと当接部136bとにより、フィルタ141と密閉容器134との間に、本変形例のガス発生器の作動時における密閉容器134の端部134cの破裂時又は開裂時の作動空間を十分に確保できる。また、本変形例のガス発生器の作動時には、位置134c1に応力が集中した状態で、密閉容器134の端部134cが破裂又は開裂するようになっている。したがって、本変形例のガス発生器の作動時における密閉容器134の端部134cの破裂又は開裂をスムーズに行うことができる。 The partition member 136, as shown in FIG. 3, includes a first tubular portion 136a, a contact portion 136b, and a second tubular portion 136c. The first tubular portion 136a has an inner diameter larger than the inner diameter of the filter 141, and an opening is formed at the end on the igniter side. The igniter-side end of the first tubular portion 136a is in contact with the end 134c of the sealed container 134 so that the opening of the first tubular portion 136a faces the end 134c. The contact portion 136b is provided on the filter 141 side of the first cylindrical portion 136a, contacts the igniter-side end portion of the filter 141, and has a cross section that decreases in diameter from the first cylindrical portion 136a side to the filter 141 side. It is tapered (annular). The first cylindrical portion 136a and the contact portion 136b provide a gap between the filter 141 and the closed container 134 when the end portion 134c of the closed container 134 is ruptured or ruptured during operation of the gas generator of this modification. can ensure sufficient working space. In addition, when the gas generator of this modified example is activated, the end portion 134c of the sealed container 134 bursts or splits with the stress concentrated on the position 134c1. Therefore, the end portion 134c of the sealed container 134 can be smoothly ruptured or split when the gas generator of this modified example is operated.
 第2筒状部136cは、当接部136bから連続的かつ一体的に形成されているものであり、フィルタ141の中空部141aの内部に位置するように設けられている。 The second tubular portion 136c is formed continuously and integrally from the contact portion 136b, and is provided so as to be positioned inside the hollow portion 141a of the filter 141. As shown in FIG.
 本変形例のガス発生器によれば、上記実施形態と同様の作用効果を奏することができる。 According to the gas generator of this modified example, it is possible to achieve the same effects as those of the above embodiment.
 また、別の変形例として、上記実施形態における仕切り部材36について、第1筒状部36a及び当接部36bだけとし、第2筒状部36cを設けないものとしてもよい。 Further, as another modified example, the partition member 36 in the above embodiment may be provided with only the first tubular portion 36a and the contact portion 36b, and without the second tubular portion 36c.
 また、他の変形例として、上記実施形態又は変形例におけるハウジングの代わりに、図4に示したハウジング210(ホルダなどをかしめ固定する前のハウジング前駆体)を用いてもよい。このハウジング210は、口径の異なる2種類のガス噴出口211a、211bをそれぞれ複数有しており、上記実施形態又は変形例と同様、フィルタ(図示せず)に対向した位置に設けられる。また、ハウジング210は、複数のガス噴出口211aが設けられている領域Aと、複数のガス噴出口211bが設けられている領域Bと、を有している。また、点火器側(図4紙面下側)のガス噴出口211bをガス噴出口211aの口径よりも小さな口径とすることで、ガス噴出口211a、211bの内部側に設けられる上記実施形態又は変形例と同様のフィルタ(図示せず)を満遍なく有効活用することができるようになっている。 Also, as another modified example, instead of the housing in the above embodiment or modified example, a housing 210 (housing precursor before crimping a holder or the like) shown in FIG. 4 may be used. This housing 210 has a plurality of two types of gas jetting ports 211a and 211b with different diameters, respectively, and is provided at a position facing a filter (not shown) as in the above embodiment or modification. Further, the housing 210 has a region A provided with a plurality of gas ejection ports 211a and a region B provided with a plurality of gas ejection ports 211b. In addition, by making the diameter of the gas ejection port 211b on the igniter side (the lower side of the paper in FIG. 4) smaller than the diameter of the gas ejection port 211a, the gas ejection ports 211a, 211b are provided inside the above-described embodiment or modification. Filters (not shown) similar to the example can be used effectively evenly.
 また、上記実施形態及び変形例において、ハウジングの縮径方法については、かしめ加工を例に説明したが、ハウジングを縮径できる加工方法ならどのようなものであってもよい。 In addition, in the above embodiment and modified example, the method for reducing the diameter of the housing has been described by taking caulking as an example, but any processing method that can reduce the diameter of the housing may be used.
10、110、210  ハウジング
10a  周壁
10e  周壁
11、211a、211b  ガス噴出口
12  閉塞部材
13  環状溝部
20  ホルダ
21  嵌合部
22  環状溝部
23  嵌合部
24  かしめ部
31、131  ガス発生剤
32、132  AI剤
33、133  カバー部材
34、134  密閉容器
34a、134a  有底筒状部
34b  蓋部
34c、134c  端部
35  巻きバネ
36、136  仕切り部材
36a、136a  第1筒状部
36b、136b  当接部
36b1 湾曲部
36c、136c  第2筒状部
41、141  フィルタ
41a、141a  中空部
50  点火器
51  スクイブカップ
52  端子ピン
53  筒状部材
54  巻きバネ
100  ガス発生器
10, 110, 210 housing 10a peripheral wall 10e peripheral wall 11, 211a, 211b gas outlet 12 closing member 13 annular groove portion 20 holder 21 fitting portion 22 annular groove portion 23 fitting portion 24 crimped portions 31, 131 gas generating agent 32, 132 AI Agents 33, 133 Cover members 34, 134 Sealed containers 34a, 134a Bottomed tubular portion 34b Lid portions 34c, 134c End portion 35 Winding springs 36, 136 Partition members 36a, 136a First tubular portions 36b, 136b Contact portion 36b1 Curved portions 36c, 136c Second cylindrical portions 41, 141 Filters 41a, 141a Hollow portion 50 Ignitor 51 Squib cup 52 Terminal pin 53 Cylindrical member 54 Helical spring 100 Gas generator

Claims (3)

  1.  長尺状のハウジングと、
     前記ハウジングの一端に設けられ、ガス発生剤を点火する点火器と、
     前記ハウジングの他端側に設けられたフィルタと、
     前記ハウジングの内部において前記点火器と前記フィルタとの間に設けられ、前記ガス発生剤を内包する筒状部材と、
     前記ハウジングの内部において前記筒状部材と前記フィルタとの間に設けられ、前記点火器側の端部に開口部が形成されている第1筒状部と、前記第1筒状部の前記フィルタ側に設けられ、前記フィルタの前記点火器側の端部に当接する環状の当接部と、を有した仕切り部材と、
    を備え、
     前記第1筒状部は、内径が前記フィルタの内径よりも大きく、前記開口部が前記筒状部材の前記フィルタ側の端部に当接しており、
     前記当接部の中央部には、孔部が形成されていることを特徴とするガス発生器。
    an elongated housing;
    an igniter provided at one end of the housing for igniting a gas generating agent;
    a filter provided at the other end of the housing;
    a cylindrical member provided between the igniter and the filter inside the housing and containing the gas generating agent;
    A first tubular portion provided between the tubular member and the filter inside the housing and having an opening formed at an end portion on the side of the igniter; and the filter of the first tubular portion. a partition member having an annular contact portion provided on the side and contacting the end portion of the filter on the igniter side;
    with
    The first tubular portion has an inner diameter larger than the inner diameter of the filter, and the opening abuts an end portion of the tubular member on the filter side,
    A gas generator, wherein a hole is formed in the central portion of the contact portion.
  2.  前記仕切り部材は、前記孔部の内周縁から延設され、外径が前記フィルタの内径以下である第2筒状部をさらに備え、
     前記第2筒状部は、前記フィルタの内部に挿入されていることを特徴とする請求項1に記載のガス発生器。
    The partition member further includes a second tubular portion extending from the inner peripheral edge of the hole and having an outer diameter equal to or less than the inner diameter of the filter,
    2. The gas generator according to claim 1, wherein said second cylindrical portion is inserted inside said filter.
  3.  前記当接部は、前記第1筒状部から延設され、断面が前記第1筒状部側から前記フィルタ側にかけて縮径するテーパー形状のものであって、少なくとも一部が前記フィルタの内部に挿入されていることを特徴とする請求項1に記載のガス発生器。 The contact portion extends from the first cylindrical portion, and has a tapered cross-section that decreases in diameter from the first cylindrical portion side to the filter side, and at least a portion thereof is inside the filter. 2. The gas generator according to claim 1, wherein the gas generator is inserted into the .
PCT/JP2022/011148 2021-03-29 2022-03-11 Gas generator WO2022209798A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813708A1 (en) * 1998-03-27 1999-09-30 Trw Airbag Sys Gmbh & Co Kg Gas generator for safety device, especially for car passenger restraining system
JP2001151069A (en) * 1999-11-29 2001-06-05 Daicel Chem Ind Ltd Gas generator for air bag, and air bag device
JP2002337655A (en) * 2001-05-15 2002-11-27 Nippon Kayaku Co Ltd Gas generator for air bag
WO2011043314A1 (en) * 2009-10-08 2011-04-14 日本化薬株式会社 Method of manufacturing perforated pipe for gas generator, as well as gas generator
JP5455932B2 (en) * 2009-01-06 2014-03-26 日本化薬株式会社 Gas generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813708A1 (en) * 1998-03-27 1999-09-30 Trw Airbag Sys Gmbh & Co Kg Gas generator for safety device, especially for car passenger restraining system
JP2001151069A (en) * 1999-11-29 2001-06-05 Daicel Chem Ind Ltd Gas generator for air bag, and air bag device
JP2002337655A (en) * 2001-05-15 2002-11-27 Nippon Kayaku Co Ltd Gas generator for air bag
JP5455932B2 (en) * 2009-01-06 2014-03-26 日本化薬株式会社 Gas generator
WO2011043314A1 (en) * 2009-10-08 2011-04-14 日本化薬株式会社 Method of manufacturing perforated pipe for gas generator, as well as gas generator

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