WO2022239727A1 - ガス発生器 - Google Patents

ガス発生器 Download PDF

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Publication number
WO2022239727A1
WO2022239727A1 PCT/JP2022/019645 JP2022019645W WO2022239727A1 WO 2022239727 A1 WO2022239727 A1 WO 2022239727A1 JP 2022019645 W JP2022019645 W JP 2022019645W WO 2022239727 A1 WO2022239727 A1 WO 2022239727A1
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WO
WIPO (PCT)
Prior art keywords
filter
plate portion
bottom plate
housing
gas generator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/019645
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
拓哉 井上
健司 鹿浦
義孝 岩井
保博 荒木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Kayaku Co Ltd
Original Assignee
Nippon Kayaku Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Kayaku Co Ltd filed Critical Nippon Kayaku Co Ltd
Priority to US18/558,586 priority Critical patent/US20240239297A1/en
Priority to CN202280034503.3A priority patent/CN117320930A/zh
Priority to EP22807428.2A priority patent/EP4339041A1/en
Publication of WO2022239727A1 publication Critical patent/WO2022239727A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable 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
    • B60R21/264—Inflatable 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
    • B60R21/2644—Inflatable 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 using only solid reacting substances, e.g. pellets, powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable 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
    • B60R2021/26011—Inflatable 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 a filter through which the inflation gas passes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable 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
    • B60R2021/26029—Ignitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable 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
    • B60R2021/26076—Inflatable 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 characterised by casing

Definitions

  • the present invention relates to a gas generator incorporated in an occupant protection device that protects an occupant in the event of a vehicle collision, and more particularly to a gas generator incorporated in an airbag device installed in an automobile.
  • Airbag devices which are occupant protection devices, have been widely used from the viewpoint of protecting the occupants of automobiles.
  • Airbag systems are installed to protect passengers from the impact that occurs in the event of a vehicle collision. By inflating and deploying the airbag instantaneously in the event of a vehicle collision, the airbag acts as a cushion for the passenger. It accepts the body.
  • the gas generator is incorporated in this airbag system, and when a vehicle or other vehicle collides, the igniter is ignited by the energization of the control unit, and the flame generated in the igniter burns the gas generating agent to instantly generate a large amount of gas. , the device that inflates and deploys the airbag.
  • a so-called disk-type gas generator is a gas generator that is suitable for use in a driver's side air bag device installed in a steering wheel of an automobile. be.
  • the disk-type gas generator has a short cylindrical housing closed at both ends in the axial direction.
  • a gas ejection port is provided on the peripheral wall of the housing, and a gas generating agent, an igniter, etc. are accommodated inside the housing. It is a thing.
  • a filter is generally arranged inside the housing so as to surround the combustion chamber containing the gas generating agent.
  • the filter has various configurations, one of which is disclosed in Japanese Unexamined Patent Application Publication No. 2014-237389 (Patent Document 1).
  • a filter is disclosed comprising a member of
  • the filter described above is generally assembled to the housing by being axially sandwiched between the top plate portion and the bottom plate portion of the housing. This assembly structure is suitable from the viewpoint of stably fixing the filter to the housing. They are pressed into contact with each other with moderate pressure.
  • the leakage prevention member is arranged in the combustion chamber so as to cover the boundary portion between the housing and the filter, and the leakage prevention member Gas is prevented from leaking out by being covered with
  • the leakage prevention member covering the inner peripheral surface of the axial end of the filter can be made sufficiently large along the axial direction of the filter. become necessary.
  • the present invention has been made to solve the above-described problems.
  • the purpose is to provide a generator.
  • a gas generator comprises a housing, a gas generating agent, an igniter, and a filter.
  • the housing has a peripheral wall portion, a top plate portion, and a bottom plate portion. One axial end of the peripheral wall portion is closed by the top plate portion, and the other axial end of the peripheral wall portion is is closed by the bottom plate portion.
  • the gas generating agent generates gas by burning, and is arranged inside the housing.
  • the igniter is for burning the gas generating agent, and is attached to the housing.
  • the filter is disposed inside the housing and has a hollow cylindrical shape surrounding the combustion chamber containing the gas generating agent in the radial direction of the peripheral wall portion.
  • the peripheral wall portion is provided with a gas ejection port for ejecting gas generated in the combustion chamber to the outside.
  • the filter is composed of a wound body or a braided body of metal wire.
  • the filter is held by the housing in an axially compressed state by being sandwiched between the top plate portion and the bottom plate portion.
  • the filter has an axial length of 1.0 mm or more from a state sandwiched between the top plate portion and the bottom plate portion when the sandwiching between the top plate portion and the bottom plate portion is released and the load is unloaded. It stretches.
  • the amount of gas generated by combustion of the gas generating agent is preferably 1.0 mol or more and 3.0 mol or less.
  • the top plate portion which defines the combustion chamber, and the end portion of the inner peripheral surface of the filter on the side of the top plate portion are brought into contact with the top plate portion.
  • the lower side support member covering the boundary portion between the plate portion and the filter, the bottom plate portion defining the combustion chamber, and the end portion of the inner peripheral surface of the filter on the side of the bottom plate portion.
  • an upper support member covering a boundary portion between the bottom plate portion and the filter.
  • the present invention it is possible to ensure that the gas generated in the combustion chamber passes through the filter, and to provide a gas generator with improved filter utilization efficiency.
  • FIG. 1 is a schematic diagram of a disk-shaped gas generator according to Embodiment 1.
  • FIG. FIG. 2 is a schematic diagram showing the operating state of the disk-type gas generator shown in FIG. 1 ;
  • FIG. 3 is a schematic diagram for explaining Verification Test 1;
  • FIG. 10 is a schematic diagram showing a test procedure of verification test 2;
  • 4 is a graph showing the results of Verification Test 2;
  • 4 is a graph showing the results of Verification Test 2;
  • 4 is a graph and a table showing the results of Verification Test 2.
  • FIG. 4 is a graph and a table showing the results of Verification Test 2.
  • FIG. FIG. 2 is a schematic diagram assuming a state during operation of a disk-shaped gas generator provided with filters according to Example 1 and Comparative Example 1.
  • FIG. 4 is a schematic diagram of a disk-shaped gas generator according to Embodiment 2.
  • FIG. 2 is a schematic diagram assuming a state during operation of a disk-shaped gas generator provided with filters
  • FIG. 1 is a schematic diagram of a disk-shaped gas generator according to Embodiment 1.
  • FIG. 1 First, referring to FIG. 1, the configuration of a disk-shaped gas generator 1A according to this embodiment will be described.
  • a disk-type gas generator 1A has a short, substantially cylindrical housing with one end and the other end in the axial direction closed.
  • the holding portion 30, the igniter 40, the cup-shaped member 50, the transfer charge 56, the gas generating agent 61, the lower side support member 70, the upper side support member 80, the cushion material 85, and the filter are held as internal components. 90 and the like are accommodated.
  • a combustion chamber 60 in which the gas generating agent 61 of the internal components described above is mainly accommodated is located in the accommodation space provided inside the housing.
  • the housing includes a lower shell 10 and an upper shell 20.
  • Each of the lower shell 10 and the upper shell 20 is a press-formed product formed by pressing a rolled metal plate member, for example.
  • metal plate-shaped members constituting the lower shell 10 and the upper shell 20 metal plates made of stainless steel, iron steel, aluminum alloy, stainless alloy, etc. are used, and are preferably subjected to a tensile strength of 440 MPa or more and 780 MPa or less. A so-called high-strength steel plate is used, which does not cause damage such as breakage even when stress is applied.
  • the lower shell 10 and the upper shell 20 are each formed in a substantially cylindrical shape with a bottom, and a housing is constructed by combining and joining these open surfaces so that they face each other.
  • the lower shell 10 has a bottom plate portion 11 and a tubular portion 12
  • the upper shell 20 has a top plate portion 21 and a tubular portion 22 .
  • the upper end of the tubular portion 12 of the lower shell 10 is press-fitted by being inserted into the lower end of the tubular portion 22 of the upper shell 20 . Further, the tubular portion 12 of the lower shell 10 and the tubular portion 22 of the upper shell 20 are joined together at or near their abutting portions, thereby joining the lower shell 10 and the upper shell 20 together. Fixed. Electron beam welding, laser welding, friction welding, or the like can be suitably used for joining the lower shell 10 and the upper shell 20 .
  • the portion of the peripheral wall of the housing near the bottom plate portion 11 is formed by the cylindrical portion 12 of the lower shell 10
  • the portion of the peripheral wall of the housing near the top plate portion 21 is formed by the upper portion. It is constituted by the tubular portion 22 of the side shell 20 .
  • One end and the other end of the housing in the axial direction are closed by the bottom plate portion 11 of the lower shell 10 and the top plate portion 21 of the upper shell 20, respectively.
  • a projecting cylindrical portion 13 projecting toward the top plate portion 21 is provided at the center of the bottom plate portion 11 of the lower shell 10.
  • a depression 14 is formed at the center of the bottom plate portion 11 of the lower shell 10.
  • the protruding cylindrical portion 13 is a portion to which the igniter 40 is fixed via the holding portion 30
  • the recessed portion 14 is a portion serving as a space for providing the female connector portion 34 in the holding portion 30 .
  • the projecting cylindrical portion 13 is formed in a substantially cylindrical shape with a bottom, and an opening portion 15 is provided at an axial end located on the top plate portion 21 side.
  • the opening 15 is a portion through which the pair of terminal pins 42 of the igniter 40 are inserted.
  • the igniter 40 is for generating flame, and includes an ignition portion 41 and the pair of terminal pins 42 described above.
  • the ignition part 41 contains therein an ignition charge that generates flame by being ignited and burned during operation, and a resistor for igniting the ignition charge.
  • a pair of terminal pins 42 are connected to the ignition portion 41 to ignite the ignition charge.
  • the ignition part 41 includes a cup-shaped squib cup and a plug that closes the open end of the squib cup and holds a pair of terminal pins 42 inserted therein.
  • a resistor bridge wire
  • the resistor bridge wire
  • An ignition charge is loaded in the squib cup so as to
  • Nichrome wire or the like is generally used as the resistor, and ZPP (zirconium/potassium perchlorate), ZWPP (zirconium/tungsten/potassium perchlorate), lead tricinate, etc. are generally used as the ignition charge.
  • ZPP zirconium/potassium perchlorate
  • ZWPP zirconium/tungsten/potassium perchlorate
  • lead tricinate etc.
  • the squib cups and emboli described above are generally made of metal or plastic.
  • a predetermined amount of current flows through the resistor via the terminal pin 42 .
  • Joule heat is generated in the resistor, and the ignition charge starts burning.
  • the high temperature flame produced by the combustion ruptures the squib cup containing the ignition charge.
  • the time from when the current flows through the resistor until the igniter 40 is activated is generally 2.0 milliseconds or less when a nichrome wire is used as the resistor.
  • the igniter 40 is attached to the bottom plate portion 11 while being inserted from the inside of the lower shell 10 so that the terminal pin 42 is inserted through the opening 15 provided in the projecting cylindrical portion 13 .
  • a holding portion 30 made of a resin molded portion is provided around the protruding cylindrical portion 13 provided on the bottom plate portion 11, and the igniter 40 is held by the holding portion 30. is fixed to the bottom plate portion 11 by
  • the holding portion 30 is formed by injection molding (more specifically, insert molding) using a mold. It is formed by applying an insulating fluid resin material to the bottom plate portion 11 so as to reach from a part of the inner surface to a part of the outer surface of the bottom plate portion 11 and solidifying it.
  • thermosetting resins represented by epoxy resins, etc.
  • polybutylene terephthalate resin polyethylene terephthalate resin
  • polyamide resin for example, nylon 6, nylon 66, etc.
  • polypropylene sulfide resin polypropylene oxide resin, etc.
  • thermoplastic resin that When these thermoplastic resins are selected as the raw material, it is preferable that these resin materials contain glass fiber or the like as a filler in order to secure the mechanical strength of the holding portion 30 after molding. However, if sufficient mechanical strength can be ensured only by the thermoplastic resin, it is not necessary to add the filler as described above.
  • the holding portion 30 includes an inner coating portion 31 that partially covers the inner surface of the bottom plate portion 11 of the lower shell 10, an outer coating portion 32 that partially covers the outer surface of the bottom plate portion 11 of the lower shell 10, and a lower A connecting portion 33 is located in the opening 15 provided in the bottom plate portion 11 of the side shell 10 and is continuous with the inner covering portion 31 and the outer covering portion 32, respectively.
  • the holding portion 30 is fixed to the bottom plate portion 11 on the surfaces of the inner covering portion 31, the outer covering portion 32, and the connecting portion 33 on the bottom plate portion 11 side. Further, the holding portion 30 is fixed to the side surface and the lower surface of the portion of the ignition portion 41 of the igniter 40 near the lower end and the surface of the portion of the terminal pin 42 of the igniter 40 near the upper end.
  • the opening 15 is completely embedded by the terminal pin 42 and the holding portion 30, and the airtightness of the space inside the housing is ensured by ensuring the sealing performance in this portion.
  • a female connector portion 34 is formed in a portion of the holding portion 30 facing the outside of the outer covering portion 32 .
  • the female connector portion 34 is a portion for receiving a male connector (not shown) of a harness for connecting the igniter 40 and a control unit (not shown). It is located in a recess 14 provided.
  • a portion near the lower end of the terminal pin 42 of the igniter 40 is exposed in the female connector portion 34 .
  • a male connector is inserted into the female connector portion 34 to achieve electrical continuity between the core wires of the harness and the terminal pins 42 .
  • the above-described injection molding may be performed using the lower shell 10 having an adhesive layer provided in advance at a predetermined position on the surface of the bottom plate portion 11 that is to be covered by the holding portion 30 .
  • the adhesive layer can be formed by applying an adhesive to a predetermined position of the bottom plate portion 11 in advance and curing the adhesive.
  • the adhesive to be applied to the bottom plate portion 11 in advance one containing a resin material having excellent heat resistance, durability, corrosion resistance, etc. after curing as a raw material is preferably used.
  • a material containing a base resin as a raw material is particularly preferably used.
  • the holding portion 30 made of the resin molded portion can be more firmly fixed to the bottom plate portion 11. be possible. Therefore, if the adhesive layer is annularly provided along the circumferential direction so as to surround the opening 15 provided in the bottom plate portion 11, it is possible to secure a higher sealing performance in that portion.
  • the igniter 40 can be fixed to the lower shell 10 by injection molding the holding part 30 made of a resin molded part is illustrated, but the igniter 40 to the lower shell 10 It is also possible to use other alternatives for the fixation of the .
  • a cup-shaped member 50 is assembled to the bottom plate portion 11 so as to cover the projecting cylindrical portion 13 , the holding portion 30 and the igniter 40 .
  • the cup-shaped member 50 has a substantially cylindrical shape with an open end on the bottom plate portion 11 side, and includes a transfer chamber 55 in which a transfer charge 56 is accommodated.
  • the cup-shaped member 50 protrudes into the combustion chamber 60 containing the gas generating agent 61 so that the transfer chamber 55 provided therein faces the ignition portion 41 of the igniter 40 . positioned to be located.
  • the cup-shaped member 50 includes a cylindrical side wall portion 51 that defines the above-described fire transfer chamber 55 and an axial end portion of the side wall portion 51 that defines the fire transfer chamber 55 and is located on the top plate portion 21 side. It has a top wall portion 52 and an extension portion 53 extending radially outward from the opening end side portion of the side wall portion 51 . Extending portion 53 is formed to extend along the inner surface of bottom plate portion 11 of lower shell 10 . Specifically, the extension portion 53 has a shape that is bent along the shape of the inner bottom surface of the bottom plate portion 11 in the portion where the projecting tubular portion 13 is provided and in the vicinity thereof. The directionally outward portion includes a flange-like extending tip 54 .
  • a distal end portion 54 of the extension portion 53 is arranged between the bottom plate portion 11 and the lower side support member 70 along the axial direction of the housing, thereby extending between the bottom plate portion 11 and the lower side along the axial direction of the housing. It is sandwiched between the support member 70 and the support member 70 .
  • the lower side support member 70 is in a state of being pressed toward the bottom plate portion 11 side by the gas generating agent 61, the cushion material 85, the upper side support member 80, and the top plate portion 21 arranged thereabove.
  • the cup-shaped member 50 is fixed to the bottom plate portion 11 when the tip portion 54 of the extension portion 53 is pressed toward the bottom plate portion 11 by the lower side support member 70 .
  • the cup-shaped member 50 is prevented from coming off from the bottom plate portion 11 without using caulking or press-fitting to fix the cup-shaped member 50 .
  • the cup-shaped member 50 has no openings in either the side wall portion 51 or the top wall portion 52, and surrounds a transfer chamber 55 provided therein.
  • the transfer charge 56 is ignited by the operation of the igniter 40, the cup-shaped member 50 bursts or melts as the pressure rises in the transfer chamber 55 and the conduction of the generated heat. Materials with relatively low mechanical strength are used.
  • the cup-shaped member 50 a member made of metal such as aluminum or aluminum alloy, thermosetting resin such as epoxy resin, polybutylene terephthalate resin, polyethylene terephthalate resin, or polyamide resin (for example, nylon 6 or nylon 66, etc.), polypropylene sulfide resin, polypropylene oxide resin, and the like.
  • thermosetting resin such as epoxy resin, polybutylene terephthalate resin, polyethylene terephthalate resin, or polyamide resin (for example, nylon 6 or nylon 66, etc.), polypropylene sulfide resin, polypropylene oxide resin, and the like.
  • the fixing method of the cup-shaped member 50 is not limited to the fixing method using the lower support member 70 described above, and other fixing methods may be used.
  • the transfer charge 56 filled in the transfer charge chamber 55 is ignited by the flame generated by the operation of the igniter 40 and burns to generate thermal particles.
  • the transfer charge 56 must be capable of reliably starting combustion of the gas generating agent 61, and is generally B/KNO 3 , B/NaNO 3 , Sr(NO 3 ) 2 or the like.
  • a composition consisting of metal powder/oxidizing agent represented by , a composition consisting of titanium hydride/potassium perchlorate, a composition consisting of B/5-aminotetrazole/potassium nitrate/molybdenum trioxide, and the like are used.
  • the transfer charge 56 a powder or a binder molded into a predetermined shape is used.
  • the shape of transfer charge 56 formed by the binder includes various shapes such as granular, cylindrical, sheet, spherical, single-hole cylindrical, multi-hole cylindrical, and tablet-like.
  • a combustion chamber 60 containing a gas generating agent 61 is located in a space surrounding the portion where the cup-shaped member 50 described above is arranged in the space inside the housing. Specifically, as described above, the cup-shaped member 50 protrudes into the combustion chamber 60 formed inside the housing, and faces the outer surface of the side wall portion 51 of the cup-shaped member 50 .
  • the space provided in the portion and the space provided in the portion facing the outer surface of the top wall portion 52 are configured as a combustion chamber 60 .
  • a filter 90 is arranged along the inner circumference of the housing in a space radially surrounding the combustion chamber 60 containing the gas generating agent 61 .
  • the filter 90 is sandwiched between the top plate portion 21 and the bottom plate portion 11 of the housing, and is held by the housing in an axially compressed state.
  • the filter 90 has a hollow cylindrical shape and is arranged so that its central axis substantially coincides with the axial direction of the housing.
  • the gas generating agent 61 is an agent that is ignited by thermal particles generated by the operation of the igniter 40 and generates gas by burning.
  • the gas generating agent 61 it is preferable to use a non-azide gas generating agent, and generally the gas generating agent 61 is formed as a compact containing a fuel, an oxidant and an additive.
  • a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used as the fuel.
  • a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used as the fuel.
  • nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used.
  • the oxidizing agent examples include basic nitrates such as basic copper nitrate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, alkaline earth metals, transition metals, and cations selected from ammonia.
  • basic nitrates such as basic copper nitrate
  • perchlorates such as ammonium perchlorate and potassium perchlorate
  • alkali metals alkaline earth metals, transition metals, and cations selected from ammonia.
  • Nitrate containing is used.
  • nitrates for example, sodium nitrate, potassium nitrate and the like are preferably used.
  • Additives include binders, slag forming agents, and combustion modifiers.
  • binder for example, organic binders such as polyvinyl alcohol, metal salts of carboxymethyl cellulose and stearates, and inorganic binders such as synthetic hydrotalcite and acid clay can be preferably used.
  • binders include polysaccharide derivatives such as hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, microcrystalline cellulose, guar gum, polyvinylpyrrolidone, polyacrylamide, and starch.
  • inorganic binders such as molybdenum disulfide, talc, bentonite, diatomaceous earth, kaolin, and alumina can be suitably used.
  • slag forming agent silicon nitride, silica, acid clay, etc. can be suitably used.
  • Metal oxides, ferrosilicon, activated carbon, graphite and the like can be suitably used as combustion modifiers.
  • the shape of the molded body of the gas generating agent 61 includes various shapes such as grains such as granules, pellets, and cylinders, and discs.
  • a perforated shaped body having through holes inside the shaped body is also used.
  • These shapes are preferably selected appropriately according to the specifications of the airbag device in which the disk-type gas generator 1A is incorporated. It is preferable to select the optimum shape according to the specifications, such as selecting .
  • it is preferable to appropriately select the size and filling amount of the compact in consideration of the linear burning velocity, pressure index, etc. of the gas generating agent 61.
  • the filter 90 is composed of a wound body or a braided body of metal wire.
  • a material obtained by winding a metal wire such as stainless steel or steel, or a net material in which a metal wire is woven and compacted by pressing can be used.
  • a mesh material specifically, a knitted wire mesh, a plain-woven wire mesh, an aggregate of crimp-woven metal wires, or the like can be used.
  • the filter 90 When the gas generated in the combustion chamber 60 passes through the filter 90, the filter 90 functions as a cooling means for cooling the gas by removing high-temperature heat from the gas, and removes residue contained in the gas. It also functions as a removing means for removing (slag) and the like. 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 within the combustion chamber 60 passes through the filter 90 .
  • the filter 90 is one that can be elastically deformed to a relatively large extent along the axial direction. Therefore, the filter 90 has high resilience that allows it to expand greatly along its axial direction when it is unloaded from a compressed state along its axial direction. By using such a filter 90, it is possible to ensure that the gas generated in the combustion chamber passes through the filter 90, and it is possible to improve the utilization efficiency of the filter 90. will be described later.
  • the filter 90 has a gap 28 of a predetermined size between the cylindrical portion 12 of the lower shell 10 and the cylindrical portion 22 of the upper shell 20, which constitute the peripheral wall of the housing. It is spaced apart from the tubular portions 12 and 22 so as to be arranged. By configuring in this way, the gas can flow smoothly inside the filter 90 and the utilization efficiency of the filter 90 can be improved as compared with the case where the filter 90 is arranged in contact with the cylindrical portions 12 and 22. can be enhanced.
  • a plurality of gas ejection ports 23 are provided in the cylindrical portion 22 of the upper shell 20 facing the filter 90 .
  • the plurality of gas ejection ports 23 are for leading out the gas that has passed through the filter 90 to the outside of the housing.
  • a metallic sealing tape 24 as a sealing member is attached to the inner peripheral surface of the tubular portion 22 of the upper shell 20 so as to close the plurality of gas ejection ports 23 .
  • the sealing tape 24 an aluminum foil or the like coated with an adhesive member on one side can be suitably used, and the sealing tape 24 ensures the airtightness of the combustion chamber 60 .
  • a lower support member 70 is arranged in the vicinity of the end portion of the combustion chamber 60 located on the bottom plate portion 11 side.
  • the lower support member 70 is a member for positioning and holding the filter 90 by coming into contact with the inner peripheral surface of the filter 90 located on the bottom plate portion 11 side.
  • the lower support member 70 has an annular shape, and is arranged substantially on the filter 90 and the bottom plate portion 11 so as to cover the boundary portion between the filter 90 and the bottom plate portion 11 . there is thus, the lower support member 70 is located between the bottom plate portion 11 and the gas generating agent 61 in the vicinity of the end portion of the combustion chamber 60 .
  • the lower support member 70 has an annular plate-shaped base portion 71 that is attached to the bottom plate portion 11 along the inner bottom surface of the bottom plate portion 11, and a contact portion that contacts the inner peripheral surface of the filter 90 near the bottom plate portion 11. It has a portion 72 and a cylindrical partition wall portion 73 erected from the base portion 71 toward the top plate portion 21 side.
  • the contact portion 72 extends from the outer edge of the base portion 71
  • the partition portion 73 extends from the inner edge of the base portion 71 .
  • the lower support member 70 is made of a member that does not burst or melt even when the transfer charge 56 burns when the igniter 40 is activated.
  • the lower support member 70 is formed, for example, by pressing a metal plate-shaped member, and is preferably made of a steel plate such as ordinary steel or special steel (for example, cold-rolled steel plate, stainless steel plate, etc.). It is composed of the following members.
  • the distal end portion 54 of the extension portion 53 of the cup-shaped member 50 described above is arranged between the bottom plate portion 11 and the base portion 71 of the lower side support member 70 along the axial direction of the housing. As a result, the distal end portion 54 is sandwiched and held between the bottom plate portion 11 and the base portion 71 along the axial direction of the housing. With this configuration, the tip portion 54 of the extension portion 53 of the cup-shaped member 50 is pressed toward the bottom plate portion 11 by the base portion 71 of the lower support member 70 , and the bottom plate portion 11 is pressed against the bottom plate portion 11 . It will be fixed against
  • An upper support member 80 is arranged at the end portion of the combustion chamber 60 located on the top plate portion 21 side.
  • the upper support member 80 is a member for positioning and holding the filter 90 by coming into contact with the inner peripheral surface of the filter 90 located on the top plate portion 21 side.
  • the upper support member 80 has a substantially disk-like shape, and is placed between the filter 90 and the top plate portion 21 so as to cover the boundary portion between the filter 90 and the top plate portion 21 . ing. Thereby, the upper support member 80 is located between the top plate portion 21 and the gas generating agent 61 in the vicinity of the end portion of the combustion chamber 60 .
  • the upper support member 80 has a base portion 81 that abuts on the top plate portion 21 and a contact portion 82 that stands upright from the peripheral edge of the base portion 81 .
  • the contact portion 82 contacts the inner peripheral surface of the axial end portion of the filter 90 located on the top plate portion 21 side.
  • the upper support member 80 is made of a member that does not burst or melt even when the transfer charge 56 burns when the igniter 40 is activated. Like the lower support member 70, the upper support member 80 is formed, for example, by pressing a plate-like member made of metal, and is preferably made of a steel plate such as ordinary steel or special steel (for example, , cold-rolled steel plate, stainless steel plate, etc.).
  • An annular cushion member 85 is arranged inside the upper support member 80 so as to come into contact with the gas generating agent 61 contained in the combustion chamber 60 .
  • the cushion material 85 is positioned between the top plate portion 21 and the gas generating agent 61 in the portion of the combustion chamber 60 on the top plate portion 21 side, so that the gas generating agent 61 is directed toward the bottom plate portion 11 side. is pressing.
  • the cushion material 85 is provided for the purpose of preventing the gas generating agent 61, which is a molded body, from being pulverized by vibration or the like. It is composed of a member made of rubber such as silicone, foamed polypropylene, foamed polyethylene, etc.), chloroprene, and EPDM.
  • FIG. 2 is a schematic diagram showing the operating state of the disk-shaped gas generator shown in FIG. Next, referring to FIG. 2, the operation of the disk-shaped gas generator 1A according to the present embodiment described above will be described.
  • the collision is detected by a collision detection means separately provided in the vehicle, and based on this, the vehicle is detected.
  • the igniter 40 is actuated by energization from a control unit separately provided in the .
  • the transfer charge 56 contained in the transfer charge chamber 55 is ignited and burned by the flame generated by the operation of the igniter 40 to generate a large amount of thermal particles. The combustion of this transfer charge 56 causes the cup-shaped member 50 to burst or melt, and the above-mentioned hot particles flow into the combustion chamber 60 .
  • the gas generated in the combustion chamber 60 passes through the inside of the filter 90. At that time, the filter 90 removes heat and cools the gas. flow into.
  • the sealing tape 24 closing the gas ejection port 23 provided in the upper shell 20 is torn, and the gas flows out of the housing through the gas ejection port 23. It is ejected.
  • the ejected gas is introduced into an airbag provided adjacent to the disk-shaped gas generator 1A to inflate and deploy the airbag.
  • the filter 90 is highly restorable. Therefore, even if the compressive force in the axial direction on the filter 90 weakens due to the housing deforming so as to swell outward in the axial direction, the filter 90 expands along the axial direction based on the restoring force. As a result, the state of pressure contact with the top plate portion 21 and the bottom plate portion 11 is maintained. Therefore, even when the disk-type gas generator 1A is operated, the filter 90 expands so as to follow the deformation of the housing in the axial direction. , the gas generated at will pass through the filter 90 without fail.
  • the axial length of the filter 90 is 1.0 mm from the state sandwiched between the top plate portion 21 and the bottom plate portion 11.
  • a material that stretches more than the above is used. The reason why such a filter 90 is used is based on the results of verification tests 1 and 2, which will be described later.
  • the filter 90 as described above when the filter 90 is assembled to the housing, the compressive load required for sandwiching between the top plate portion 21 and the bottom plate portion 11 can be reduced. . Therefore, by using the disk-type gas generator 1A according to the present embodiment, it is possible to obtain the effect of improving the assembling efficiency at the time of manufacturing.
  • lower support member 70 and upper support member 80 are installed in combustion chamber 60.
  • Lower support member 70 and upper support member 80 position filter 90.
  • the lower support member 70 is provided to hold the cup-shaped member 50 by sandwiching the tip portion 54 of the cup-shaped member 50 with the bottom plate portion 11. It was given.
  • the lower support member and the upper support member not only function as described above, but also cover the gap that may occur between the housing and the filter during operation. It also functions as a leakage prevention member that prevents gas from flowing out.
  • lower support member 70 and upper support member 80 do not have such a function.
  • the high-restoration filter 90 described above is used without relying on the lower support member 70 and the upper support member 80. It is configured to prevent the generation of gaps, thereby ensuring that the gas generated in the combustion chamber 60 passes through the filter 90 .
  • the abutment portions 72 and 82 of the lower support member 70 and the upper support member 80 are the filters.
  • the disk-shaped gas generator 1A according to the present embodiment does not have such a function as a leakage prevention member, it is necessary to sufficiently reduce the axial length of the contact portions 72 and 82. can be done.
  • the disk-type gas generator 1A As described above, by using the disk-type gas generator 1A according to the present embodiment, it is possible to ensure that the gas generated in the combustion chamber passes through the filter, and the utilization efficiency of the filter is improved. can be a disk-shaped gas generator with an increased .
  • Verification test 1 In verification test 1, in a standard disk-type gas generator, the amount of restoration of the filter required to maintain the state in which the filter is in pressure contact with the housing during operation was verified.
  • the standard disk-type gas generator is one that generates 1.0 mol or more and 3.0 mol or less of gas during its operation.
  • FIG. 3 is a schematic diagram for explaining Verification Test 1. As shown in FIG. In FIG. 3, only the lower shell 10 and the upper shell 20, the holding portion 30, and the igniter 40, which constitute the housing, are shown for easy understanding.
  • a disk-type gas generator generating 1.3 mol of gas during operation and a disk-type gas generator generating 3.0 mol of gas during operation were prepared. After each operation, the amount of deformation in the axial direction of the housing at the portion where the filter abuts (the portion indicated by reference numeral FP in the figure) was measured.
  • the housing of the disc-type gas generator which generates 1.3 mol of gas during operation, has an outer diameter of 58 mm, an axial length of 38 mm, and a bottom plate portion 11 and a top plate portion 21. is 1.5 mm.
  • the housing of the disk-type gas generator which generates 3.0 mol of gas during operation, has an outer diameter of 70 mm and an axial length of 60 mm. is 1.5 mm.
  • the bottom plate portion 11 of the lower shell 10 and the upper shell 20 are deformed due to an increase in pressure in the space inside the housing.
  • the top plate portion 21 is displaced from the position before operation indicated by the dashed line in the drawing to the position indicated by the solid line in the drawing.
  • the axial deformation amount of the housing at the portion FP with which the filter abuts corresponds to the sum of the displacement amount Ga1 of the bottom plate portion 11 and the displacement amount Ga2 of the top plate portion 21 .
  • the amount of deformation in the axial direction of the housing at the portion FP with which the filter abuts is 0.8 mm, and 1.0 mm for a disk-shaped gas generator with a gas production rate of 3.0 mol during operation.
  • the filter 90 when the filter 90 is unloaded by releasing the sandwiching between the top plate portion 21 and the bottom plate portion 11, the axial length of the filter 90 from the state sandwiched between the top plate portion 21 and the bottom plate portion 11 is increased.
  • the filter 90 By using a filter that extends by 1.0 mm or more, the filter 90 will extend so as to follow the deformation of the housing in the axial direction even when the gas generator is in operation. The formation of gaps can be effectively suppressed.
  • FIG. 4 is a schematic diagram showing the test procedure of verification test 2. As shown in FIG. 5 to 8 are graphs or tables showing the results of verification test 2.
  • FIG. 5 to 8 are graphs or tables showing the results of verification test 2.
  • Example 1 a filter with high resilience (i.e., resilience in the axial direction As Example 2, a high-restoration filter was prepared, which was assumed to be assembled in a disk-type gas generator that generated 3.0 mol of gas during operation. Further, in the verification test 2, as a comparative example 1, a low-restoration filter (that is, a shaft A filter with poor resilience in the direction) is prepared, and as Comparative Example 2, a low resilience filter is prepared that is assumed to be assembled in a disk-type gas generator that generates 3.0 mol of gas during operation. did.
  • a filter with high resilience i.e., resilience in the axial direction
  • a high-restoration filter was prepared, which was assumed to be assembled in a disk-type gas generator that generated 3.0 mol of gas during operation.
  • Comparative Example 2 a low resilience filter is prepared that is assumed to be assembled in a disk-type gas generator that generates 3.0 mol of gas during operation. did.
  • the filters according to Example 1 and Comparative Example 1 have an outer diameter of 50 mm, an axial length of 37 mm, and a thickness of 3.5 mm.
  • the filters according to Example 2 and Comparative Example 2 have an outer diameter of 60 mm, an axial length of 60 mm, and a thickness of 4.5 mm.
  • FIG. 5 is a graph showing the relationship between the compression amount Ha and the compression load F of the filter according to Example 1, and the relationship between the compression amount Ha and the compression load F of the filter according to Comparative Example 1.
  • the amount of compression Ha for the filter is about 2.0 mm when the filter is assembled in a disk-type gas generator that generates 1.3 mol of gas during operation. Therefore, when the filter according to Example 1 is used in the disc-type gas generator, it is attached to the housing with a smaller compressive load F than when the filter according to Comparative Example 1 is used in the disc-type gas generator. It turns out that it can be assembled.
  • FIG. 6 is a graph showing the relationship between the compression amount Ha and compression load F of the filter according to Example 2, and the relationship between the compression amount Ha and compression load F of the filter according to Comparative Example 2.
  • the amount of compression Ha for the filter is about 3.0 mm when the filter is assembled in a disk-type gas generator that generates 3.0 mol of gas during operation. Therefore, when the filter according to Example 2 is used in the disk-type gas generator, it is attached to the housing with a smaller compressive load F than when the filter according to Comparative Example 2 is used in the disk-type gas generator. It turns out that it can be assembled.
  • the disk-shaped gas generator 1A according to the first embodiment described above has the effect of improving the assembling efficiency when assembling the filter. .
  • FIG. 7A is a graph showing the relationship between the compression amount Ha and the restoration amount Hc of the filter according to Example 1, and the relationship between the compression amount Ha and the restoration amount Hc of the filter according to Comparative Example 1,
  • FIG. 7B is the table.
  • the restoration amount Hc of the filter according to Example 1 was 0.4 mm, and the restoration amount Hc of the filter according to Comparative Example 1 was 0.3 mm.
  • the restoration amount Hc of the filter according to Example 1 exceeded 1.0 mm. All of the restoration amounts Hc of the filters according to the above were less than 1.0 mm.
  • the restoration amount Hc was maximized when the compression amount Ha was 3.0 mm, and the restoration amount Hc at that time was 1.6 mm.
  • the restoration amount Hc when the compression amount Ha was 2.0 mm, the restoration amount Hc was 1.2 mm.
  • FIG. 8A is a graph showing the relationship between the compression amount Ha and the restoration amount Hc of the filter according to Example 2, and the relationship between the compression amount Ha and the restoration amount Hc of the filter according to Comparative Example 2,
  • FIG. 8(B) is the table.
  • the restoration amount Hc of the filter according to Example 2 was 0.7 mm, and the restoration amount Hc of the filter according to Comparative Example 2 was 0.6 mm.
  • the restoration amount Hc of the filter according to Example 2 exceeded 1.0 mm. All of the restoration amounts Hc of the filters according to the above were less than 1.0 mm.
  • the amount of restoration Hc was maximized when the amount of compression Ha was 5.0 mm, and the amount of restoration Hc at that time was 2.6 mm.
  • the recovery amount Hc was 2.0 mm.
  • the filter according to Example 1 when the filter according to Example 1 is attached to the disk-type gas generator that generates 1.3 mol of gas during operation, the amount of generated gas during operation is 3.0 mol. It is understood that the filter actually satisfies the restoring amount derived from the results of the verification test 1 described above when the filter according to Example 1 is assembled to the disk-type gas generator. Therefore, by using the disk-type gas generator 1A according to the first embodiment described above, it is possible to ensure that the gas generated in the combustion chamber passes through the filter, and the utilization efficiency of the filter is increased. It can be said that it has been experimentally confirmed that a disc-type gas generator can be made with
  • the amount of axial deformation of the housing at the portion where the filter abuts is 0 when the disk-type gas generator with a gas generation amount of 1.3 mol is operated. 0.8 mm, this is because it is assumed that the amount of deformation in the axial direction of the housing of the disk-type gas generator, which generates less gas during operation than this, is suppressed to 0.8 mm or less. Therefore, if the above-described high-restoring filter is used, the filter is kept in pressure contact with the top and bottom plates due to its restoring force even when the disk-type gas generator is in operation. This is because it is thought that
  • FIG. 9(A) is a schematic diagram showing the operation assumed when the disk-shaped gas generator to which the filter according to Example 1 or 2 is assembled is operated
  • FIG. 9(B) is a comparative example
  • FIG. 10 is a schematic diagram showing an assumed operation when the disk-type gas generator with the filter according to 1 or 2 is operated.
  • the disc-type gas generator 1A' to which the high-restoration filter that is, the filter according to Example 1 or 2 is assembled, even during its operation, the axis of the housing Since the filter 90 expands so as to follow the deformation in the direction, there is no gap between the filter 90 and the top plate portion 21 and the bottom plate portion 11 . Therefore, the gas generated in the combustion chamber 60 reliably passes through the filter 90 .
  • the axis of the housing is Since the expansion of the filter 90 cannot sufficiently follow the deformation in the direction, a gap Gb is generated between the filter 90 and both or one of the top plate portion 21 and the bottom plate portion 11 (in the figure, the top plate The illustration is based on the assumption that there is a gap between the portion 21 and the filter 90).
  • the gap Gb is 0.4 mm in the disk-type gas generator that generates 1.3 mol of gas during operation. 0.3 mm for a disk-type gas generator with a volume of 3.0 mol. Therefore, in the disk-type gas generator 1X, if no treatment is performed, part of the gas generated in the combustion chamber will flow from the gap Gb into the gap 28 without passing through the filter 90. It will flow out.
  • the disk-shaped gas generator 1X it is necessary to prevent gas from leaking out from the gap Gb by causing the lower support member 70 and the upper support member 80 to function as leakage prevention members. In that case, the axial length of the contact portions 72 and 82 of the lower support member 70 and the upper support member 80 must be considerably increased.
  • the lower support member 70 and the upper support member 80 do not need to have such a function as leakage prevention members.
  • the axial length of the contact portions 72, 82 can be made sufficiently small.
  • the area of the portion covered by the contact portions 72 and 82 of the inner peripheral surface of the filter 90 is reduced as described above.
  • the gas generated in the combustion chamber 60 passes through a larger portion of the filter 90, and as a result, the utilization efficiency of the filter 90 is greatly improved, and the material cost is reduced. It becomes possible to achieve reduction and weight reduction.
  • FIG. 10 is a schematic diagram of a disk-type gas generator according to Embodiment 2.
  • FIG. A disk-shaped gas generator 1B according to the present embodiment will be described below with reference to FIG.
  • the disc-type gas generator 1B of the present embodiment differs from the disc-type gas generator of the first embodiment described above only in that the upper support member 80 is not provided in the combustion chamber 60. As shown in FIG. 1A and its configuration are different.
  • filter 90 is positioned and held by lower side support member 70 and upper side support member 80 provided in combustion chamber 60, but in the present embodiment, Filter 90 is positioned and held only by lower support member 70 provided in combustion chamber 60 .
  • the same effects as those described in the first embodiment can be obtained. Furthermore, by using the disk-shaped gas generator 1B according to the present embodiment, it becomes possible to eliminate the upper support member 80, so it is possible to reduce the number of parts and further reduce the weight. .
  • a disk-type gas generator in which both the lower support portion and the upper support member are provided in the combustion chamber will be described as an example.
  • the disk-type gas generator in which the lower support member is provided in the combustion chamber and the upper support member is not provided in the combustion chamber has been exemplified.
  • the present invention may be applied to a disk-shaped gas generator in which the lower support member is not provided in the combustion chamber, or to a disk-shaped gas generator in which both the upper support member and the lower support member are not provided in the combustion chamber. You may apply this invention to a generator.
  • 1A, 1A', 1B, 1X Disk-type gas generator 10 Lower shell, 11 Bottom plate, 12 Cylindrical part, 13 Projected cylinder, 14 Recess, 15 Opening, 20 Upper shell, 21 Top plate Part, 22 Cylindrical part, 23 Gas ejection port, 24 Seal tape, 28 Gap part, 30 Holding part, 31 Inner covering part, 32 Outer covering part, 33 Connecting part, 34 Female connector part, 40 Ignitor, 41 Ignition Part, 42 Terminal pin, 50 Cup-shaped member, 51 Side wall part, 52 Top wall part, 53 Extension part, 54 Tip part, 55 Transfer chamber, 56 Transfer charge, 60 Combustion chamber, 61 Gas generating agent, 70 Lower side Support member, 71 base, 72 abutment, 73 partition, 80 upper support member, 81 base, 82 abutment, 85 cushion material, 90 filter, 100 compression tester.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
PCT/JP2022/019645 2021-05-13 2022-05-09 ガス発生器 Ceased WO2022239727A1 (ja)

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US18/558,586 US20240239297A1 (en) 2021-05-13 2022-05-09 Gas generator
CN202280034503.3A CN117320930A (zh) 2021-05-13 2022-05-09 气体发生器
EP22807428.2A EP4339041A1 (en) 2021-05-13 2022-05-09 Gas generator

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JP2021081849A JP2022175461A (ja) 2021-05-13 2021-05-13 ガス発生器
JP2021-081849 2021-05-13

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JP2007160954A (ja) * 2005-12-09 2007-06-28 Daicel Chem Ind Ltd 車両の乗員拘束装置用ガス発生器
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