WO2021245967A1 - ガス発生器及びその製造方法 - Google Patents

ガス発生器及びその製造方法 Download PDF

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Publication number
WO2021245967A1
WO2021245967A1 PCT/JP2020/047969 JP2020047969W WO2021245967A1 WO 2021245967 A1 WO2021245967 A1 WO 2021245967A1 JP 2020047969 W JP2020047969 W JP 2020047969W WO 2021245967 A1 WO2021245967 A1 WO 2021245967A1
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WO
WIPO (PCT)
Prior art keywords
wall portion
gas generator
inner cylinder
cup
cylinder wall
Prior art date
Application number
PCT/JP2020/047969
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
利広 猪妻
Original Assignee
株式会社ダイセル
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 株式会社ダイセル filed Critical 株式会社ダイセル
Priority to DE112020007278.9T priority Critical patent/DE112020007278T5/de
Priority to CN202080101599.1A priority patent/CN115697784A/zh
Publication of WO2021245967A1 publication Critical patent/WO2021245967A1/ja

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    • 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
    • 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
    • B60R2021/2648—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 comprising a plurality of combustion chambers or sub-chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators

Definitions

  • the present invention relates to a gas generator and a method for manufacturing the gas generator.
  • an airbag device is known as an occupant protection device that protects occupants of automobiles and the like.
  • the airbag device is a device for protecting an occupant from an impact generated at the time of a vehicle collision by instantly inflating and deploying the airbag at the time of a vehicle collision.
  • the airbag device is equipped with a gas generator for supplying gas for expanding and deploying the airbag during operation.
  • a gas generator for supplying gas for expanding and deploying the airbag during operation.
  • an igniter and a gas generator are placed inside the housing, and the gas generator is burned by operating the igniter, and the combustion gas is discharged from the gas discharge hole formed in the housing to the outside. Those that release to are widely used.
  • a gas generator in which a power transfer agent (enhancer) as a combustion accelerator is arranged between a combustion chamber containing a gas generator and an igniter.
  • a power transfer agent as a combustion accelerator
  • the explosive is housed in a fire transmission room provided inside a cup-shaped member called an enhancer cup, and the enhancer cup protrudes into the combustion chamber so that the fire transmission room faces the ignition part of the igniter.
  • the enhancer cup is formed with a communication hole for communicating the fire transmission chamber and the combustion chamber, and the communication hole is closed with a sealing tape or the like before the igniter is operated.
  • the sealing tape is torn by the pressure of the combustion gas generated by the combustion of the explosive, and the fire transmission chamber and the combustion chamber are communicated with each other.
  • the gas generating agent can be more reliably burned by the flame emitted from the communication hole of the enhancer cup.
  • FIG. 8 of Patent Document 1 the inside of the peripheral wall portion 60 in which a part of the resin base 20 for integrally fixing the igniter 16 to the bottom plate of the housing 12 extends toward the top plate side.
  • a gas generator 10 in which a booster chamber 24 for accommodating a booster agent 23 is formed, and a cup 32 having a gas discharge opening is covered on the outer peripheral side of the peripheral wall portion 60. Then, when the gas generator 10 is operated, the portion of the peripheral wall portion 60 corresponding to the gas discharge opening of the cup 32 is cleaved, so that the gas discharge opening of the cup 32 opens the booster chamber 24 and the combustion chamber 30 outside the cup 32. It will be in a state of communication. As a result, the gas generating agent contained in the combustion chamber 30 can be ignited by the combustion gas or flame of the booster agent 23 discharged from the gas discharge opening of the cup 32.
  • the combustion gas generated by the combustion of the booster agent 23 in the booster chamber 24 during operation is supplied into the combustion chamber 30 through the gas discharge opening of the cup 32, so that combustion is performed.
  • the gas generator in the chamber 30 will be ignited from the vicinity of the gas discharge opening of the cup 32. Therefore, there is a concern that the ignition of the gas generating agent may be delayed in the entire combustion chamber 30, and the gas output may be delayed when the gas generator is operated.
  • the technique of the present disclosure has been made in view of the above-mentioned problems, and an object thereof is a gas generator and a method for manufacturing the gas generator, in which the ignition delay of the gas generator is suppressed and the manufacturing efficiency is improved as compared with the conventional technique. Is to provide technology related to.
  • one aspect of the technique of the present disclosure includes an outer shell container having a lower container having a bottom plate portion and an upper container having a top plate portion, and having a combustion chamber inside containing a gas generating agent, and an igniting agent. It has an igniter housed and includes an igniter assembled to the bottom plate portion via a resin holding portion, wherein the holding portion has a base portion for fixing the igniter to the bottom plate portion. , A tubular inner cylinder wall portion extending from the base portion toward the top plate portion and having a combustion chamber for accommodating the combustion charge inside so as to face the ignition portion.
  • a cup-shaped cover body attached to the holding portion, the top wall portion covering the upper end opening formed at the upper end of the inner cylinder wall portion, and extending from the top wall portion toward the bottom plate portion.
  • a cup-shaped cover body including a tubular side wall portion arranged along the inner cylinder wall portion, and neither the top wall portion nor the side wall portion has an opening penetrating them in the plate thickness direction. Further, gas is generated in which the fire transmission chamber and the combustion chamber communicate with each other by melting or bursting the cup-shaped cover body and the inner cylinder wall portion due to the combustion of the combustion charge accompanying the ignition of the ignition charge. It is a vessel.
  • the side wall portion may be extrapolated to the inner cylinder wall portion.
  • the lower end portion of the side wall portion may be press-fitted into the base portion.
  • the inner cylinder wall portion and the side wall portion may have a cylindrical shape, and the lower end portion of the side wall portion may have an enlarged diameter.
  • top wall portion is projected from the peripheral edge portion where the top wall portion is connected to the side wall portion and from the peripheral edge portion toward the top plate portion, and the degree of protrusion from the peripheral edge portion due to bending deformation. May include a modifiable protrusion.
  • the base portion and the inner cylinder wall portion may be integrally formed.
  • one aspect of the technique of the present disclosure is a method for manufacturing a gas generator in which a gas generator is housed in an outer shell container including a lower container having a bottom plate portion and an upper container having a top plate portion.
  • the combustion charge filling step of filling the fire transmission chamber formed inside the inner cylinder wall portion from the upper end opening, the top wall portion, and the extension from the top wall portion.
  • a cup-shaped cover body including a tubular side wall portion to be formed and having neither the top wall portion nor the side wall portion having an opening penetrating them in the plate thickness direction is prepared, and the top wall portion is the upper end portion.
  • It has a gas generating agent filling step of filling a chamber with a gas generating agent, and a sealing step of sealing the combustion chamber by integrally joining the lower container and the upper container, and the cup-shaped cover.
  • the side wall portion may be externally attached to the inner cylinder wall portion.
  • the lower end portion of the side wall portion may be press-fitted into the base portion.
  • the technique of the present disclosure it is possible to provide a technique relating to a gas generator and a manufacturing method thereof, in which the ignition delay of the gas generator is suppressed and the manufacturing efficiency is improved as compared with the conventional case.
  • FIG. 1 is an axial sectional view schematically showing an internal structure along a central axis of the gas generator according to the first embodiment.
  • FIG. 2 is a diagram illustrating a procedure for manufacturing a gas generator according to the first embodiment.
  • FIG. 3 is a diagram illustrating a situation corresponding to the preparation process.
  • FIG. 4 is a diagram illustrating a situation corresponding to the explosive charge filling process.
  • FIG. 5 is a diagram illustrating a situation corresponding to the cover mounting process.
  • FIG. 6 is a diagram illustrating a situation corresponding to the cover mounting process.
  • FIG. 7 is a diagram illustrating a situation corresponding to the filter mounting process.
  • FIG. 8 is a diagram illustrating a situation corresponding to the filter mounting process.
  • FIG. 1 is an axial sectional view schematically showing an internal structure along a central axis of the gas generator according to the first embodiment.
  • FIG. 2 is a diagram illustrating a procedure for manufacturing a gas generator according to the first embodiment.
  • FIG. 9 is a diagram illustrating a situation corresponding to the gas generating agent filling process.
  • FIG. 10 is a diagram illustrating a situation corresponding to the sealing process.
  • FIG. 11 is a diagram illustrating a conventional procedure for assembling a gas generator.
  • FIG. 12 is a diagram illustrating a conventional procedure for assembling a gas generator.
  • FIG. 13 is a diagram showing the internal structure of the gas generator according to the first modification of the first embodiment.
  • FIG. 14 is a top view of the cup-shaped cover body according to the first modification of the first embodiment.
  • FIG. 15 is a diagram showing the internal structure of the gas generator according to the second modification of the first embodiment.
  • FIG. 1 is an axial sectional view schematically showing an internal structure of the gas generator 100 according to the first embodiment along the central axis X.
  • a cross section obtained by cutting the gas generator 100 along the central axis X may be referred to as a “vertical cross section” of the gas generator 100.
  • the direction along the central axis X of the gas generator 100 may be referred to as the "vertical direction" of the gas generator 100.
  • FIG. 1 shows a state before the operation of the gas generator 100.
  • the gas generator 100 is, for example, an airbag gas generator for supplying gas for expanding and deploying an airbag to the airbag.
  • the gas generator 100 includes a housing 1, an igniter 4, a resin holding portion 5, a filter 6, a cup-shaped cover body 7, a power transmission agent 110, a gas generator 120, and the like.
  • the gas generator 100 is configured to burn the gas generator 120 by operating the igniter 4 and discharge the combustion gas, which is a combustion product thereof, from the gas discharge hole 11 formed in the housing 1. ..
  • each configuration of the gas generator 100 will be described.
  • the housing 1 is a metal outer shell container that houses each component constituting the gas generator 100, and includes an upper container 2 and a lower container 3.
  • the upper container 2 and the lower container 3 are each formed in a substantially cylindrical shape with a bottom, and when they are joined with their open ends facing each other, both ends in the central axis X direction are closed.
  • the housing 1 is formed as a short cylindrical outer shell container.
  • the upper container 2 and the lower container 3 can be formed by, for example, pressing a stainless steel plate.
  • an igniter 4 Inside the housing 1, an igniter 4, a filter 6, a cup-shaped cover 7, a gunpowder 110, a gas generating agent 120, and the like are arranged inside the housing 1, and a combustion chamber 10 is formed inside the housing 1, and the gas generating agent 120 is housed in the combustion chamber 10.
  • the upper container 2 side that is, the upper side in FIG. 1
  • the lower container 3 side that is, the lower side in FIG. 1).
  • the upper container 2 has a cylindrical upper peripheral wall portion 21 and a top plate portion 22 that closes the upper end of the upper peripheral wall portion 21.
  • the top plate portion 22 has a substantially circular shape in a plan view, and the lower end portion of the upper peripheral wall portion 21 is formed as an open end.
  • a joint portion 23 extending radially outward in a flange shape is provided at the lower end portion of the upper peripheral wall portion 21 in the upper container 2.
  • the lower container 3 has a cylindrical lower peripheral wall portion 31 and a bottom plate portion 32 that closes the lower end of the lower peripheral wall portion 31.
  • the bottom plate portion 32 has a substantially circular shape in a plan view, and the upper end portion of the lower peripheral wall portion 31 is formed as an open end.
  • a joint portion 33 extending radially outward in a brim shape is continuously provided. Further, a mounting hole 320 for attaching the igniter 4 to the bottom plate portion 32 is formed in the center of the bottom plate portion 32 in the lower container 3.
  • the housing 1 is formed by overlapping the joint portion 23 of the upper container 2 and the joint portion 33 of the lower container 3 with each other and joining them by laser welding or the like. Further, in the upper peripheral wall portion 21 of the upper container 2, a plurality of gas discharge holes 11 that communicate the internal space and the external space of the housing 1 are formed side by side along the circumferential direction. The gas discharge hole 11 is closed from the inside by the sealing tape 11A in the state before the igniter 4 is operated.
  • the sealing tape 11A for example, an aluminum foil or the like having an adhesive member coated on one side can be used.
  • the bottom plate portion 32 in the lower container 3 has an annular outer peripheral bottom wall portion 321 connected to the lower end of the lower peripheral wall portion 31 and the outer peripheral bottom wall portion 321 from the radial inner peripheral side toward the upper side ( That is, it includes a raised bottom wall portion 322 that rises (toward the inside of the housing 1).
  • the raised bottom wall portion 322 has a cylindrical cylindrical wall portion 322A that stands substantially vertically from the radial inner peripheral side of the outer peripheral bottom wall portion 321 and the upper end side of the cylindrical wall portion 322A is bent toward the center side of the housing 1. It contains an annular flange portion 322B formed by being squeezed.
  • the mounting hole 320 for mounting the igniter 4 to the bottom plate portion 32 is formed along the inner peripheral edge of the flange portion 322B in the raised bottom wall portion 322.
  • Reference numeral 32A shown in FIG. 1 is the outer surface of the bottom plate portion 32 (specifically, the outer peripheral bottom wall portion 321) of the lower container 3.
  • the igniter 4 is fixed to a mounting hole 320 formed in the bottom plate portion 32 (raised bottom wall portion 322) of the lower container 3 via a resin holding portion 5.
  • the igniter 4 is an electric igniter having an ignition unit 41 in which an igniter is housed inside a metal cup body and a pair of conductive pins 42, 42 and the like. An ignition current for igniting the igniting agent contained in the cup body is supplied to the pair of conductive pins 42, 42.
  • the base end side of the pair of conductive pins 42, 42 is held in an electrically insulated state by the resin holding portion 5 and inserted into the inside of the cup body.
  • a bridge wire (resistor) provided inside the cup body is connected so as to connect the base ends of the pair of conductive pins 42, 42 to each other.
  • the bridge wire may be, for example, a nichrome wire or the like.
  • the ignition agent ZPP (zirconium / potassium perchlorate), ZWPP (zirconium / tungsten / potassium perchlorate), THPP (titanium hydride / potassium perchlorate), lead styphnate and the like may be adopted. ..
  • the igniter is housed inside the cup body in contact with the bridge wire.
  • the bridge wire When operating the igniter 4, the bridge wire generates heat due to the ignition current supplied to the pair of conductive pins 42, 42. As a result, the igniting agent contained in the cup body of the igniter 4 is ignited and burned, and a combustion product (for example, a flame) is generated. Then, the internal pressure of the cup body rises with the combustion of the igniter, and the cup body is cleaved, so that the combustion product is released from the cleaved portion of the cup body. Further, a part of the pair of conductive pins 42, 42 in the igniter 4 is arranged so as to be exposed to the connector insertion space S1 formed on the outside of the housing 1 through the mounting hole 320.
  • the connector insertion space S1 is a space for inserting an external connector, and is formed by a part of the resin holding portion 5.
  • the resin holding portion 5 extends upward from the cylindrical base portion 51 and the base portion 51 that fix the igniter 4 to the bottom plate portion 32 (raised bottom wall portion 322) of the lower container 3 toward the top plate portion 22. It is configured to include a cylindrical inner cylinder wall portion 52 and the like to be provided.
  • the resin holding portion 5 is formed, for example, by injection molding a resin material between the raised bottom wall portion 322 of the lower container 3 and the igniter 4. For example, a heated and melted resin material is injected and injected around the raised bottom wall portion 322 and the igniter 4 of the lower container 3 arranged in the injection molding die, respectively, and the igniter 4 and the raised bottom wall portion 322 are injected.
  • the igniter 4 can be fixed to the raised bottom wall portion 322 of the lower container 3.
  • the ignition portion 41 in the igniter 4 is arranged on the accommodation space side of the housing 1, and the accommodation space of the housing 1 is provided with the pair of conductive pins 42, 42 exposed to the outside of the housing 1.
  • the raised bottom wall portion 322 of the lower container 3 and the igniter 4 are integrally joined so as to be sealed.
  • the base portion 51 of the resin holding portion 5 is formed in a columnar shape by being densely filled with the resin material.
  • the base portion 51 is arranged coaxially with, for example, the central axis X of the housing 1.
  • the lower end side of the cup-shaped cover body 7 is press-fitted into the outer peripheral surface 51A of the base portion 51 so as to hold the cup-shaped cover body 7.
  • the base portion 51 and the inner cylinder wall portion 52 of the resin holding portion 5 in the present embodiment are integrally formed, but the present invention is not limited to this.
  • the inner cylinder wall portion 52 of the resin holding portion 5 has a cylindrical shape.
  • the inner cylinder wall portion 52 is erected upward from the upper surface 51B of the base portion 51, and a fire transmission room 8 for accommodating the transmission charge 110 is formed inside the inner cylinder wall portion 52.
  • the upper end of the inner cylinder wall portion 52 is an open end, and the upper end opening 52A is formed at the open end.
  • the inner cylinder wall portion 52 is arranged so as to surround the periphery of the ignition portion 41 in the igniter 4. Therefore, the fire transmission room 8 formed inside the inner cylinder wall portion 52 is formed so as to face the ignition portion 41 in the igniter 4.
  • the fire transfer agent 110 can be filled in the fire transmission room 8 from the upper end opening 52A of the inner cylinder wall portion 52.
  • the igniter 110 housed in the fire transmission room 8 is not particularly limited, but it is preferable to use a gas generator having excellent ignitability and a higher combustion temperature than the gas generator 120.
  • a gas generator having excellent ignitability and a higher combustion temperature than the gas generator 120.
  • known ones containing, for example, nitroguanidine (34% by weight) and strontium nitrate (56% by weight) can be used.
  • the explosive 110 a known black powder (boron niter) or the like may be used.
  • the form of the explosive is not particularly limited, and it may be in the form of powder, or may be formed into various shapes such as granules, pellets, columns, and disks by a binder or the like.
  • the igniter 110 is ignited by the combustion product of the igniter released from the cup body of the ignition unit 41 when the igniter 4 is operated, and generates combustion gas.
  • a combustion chamber 10 for accommodating the gas generating agent 120 is formed on the outside of the inner cylinder wall portion 52 of the resin holding portion 5. That is, the inner cylinder wall portion 52 of the resin holding portion 5 divides the combustion chamber 10 and the fire transmission chamber 8 in the accommodation space in the housing 1 in the plane direction.
  • Reference numeral 52B is an outer peripheral surface of the inner cylinder wall portion 52.
  • reference numeral 52C shown in FIG. 1 is an inner peripheral surface of the inner cylinder wall portion 52.
  • the base portion 51 and the inner cylinder wall portion 52 of the resin holding portion 5 are both made of resin.
  • thermoplastic resins such as polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin, polypropylene sulfide resin, and polypropylene oxide resin
  • thermosetting resins such as epoxy resin. Resin is exemplified.
  • the cup-shaped cover body 7 is a member mounted on the resin holding portion 5 and has a bottomed cylindrical shape. More specifically, in the cup-shaped cover body 7, the top wall portion 71 having a circular plan view and the cylindrical side wall portion 72 extending downward from the top wall portion 71 toward the bottom plate portion 32 are integrated. It is configured in. The top wall portion 71 of the cup-shaped cover body 7 is arranged so as to cover the upper end opening 52A of the inner cylinder wall portion 52 in the resin holding portion 5. Further, the cylindrical side wall portion 72 of the cup-shaped cover body 7 is arranged along the inner cylinder wall portion 52.
  • the inner diameter of the side wall portion 72 of the cup-shaped cover 7 is set to be slightly larger than the outer diameter of the inner cylinder wall portion 52 of the resin holding portion 5, and the side wall portion 72 is the inner cylinder. It is extrapolated to the wall portion 52.
  • the specifications of the inner cylinder wall portion 52 may be such that they do not interfere with each other when the cup-shaped cover body 7 is extrapolated.
  • the inner diameter of the side wall portion 72 in the cup-shaped cover body 7 is set to be equal to the diameter of the base portion 51 or slightly smaller than the diameter of the base portion 51, and the side wall portion 72 is set to a size slightly smaller than the diameter of the base portion 51.
  • the lower end portion 721 is fixed by being press-fitted into the base portion 51.
  • a plurality of protrusions may be formed around the base portion 51 in the circumferential direction, and the lower end portion 721 of the side wall portion 72 may be press-fitted into each of the protrusions.
  • the inner diameter of the side wall portion 72 of the cup-shaped cover body 7 may be equal to the outer diameter of the inner cylinder wall portion 52.
  • the lower end portion 721 of the side wall portion 72 of the cup-shaped cover body 7 may not be press-fitted into the base portion 51 of the resin holding portion 5.
  • the cup-shaped cover body 7 in the present embodiment is solid in that neither the top wall portion 71 nor the side wall portion 72 has an opening penetrating them in the plate thickness direction. Further, the gas generator 100 in the present embodiment burns with the fire transmission chamber 8 when the cup-shaped cover body 7 and the inner cylinder wall portion 52 melt or burst due to the combustion of the ignition charge 100 accompanying the ignition of the ignition charge during operation.
  • the chamber 10 is configured to communicate with each other.
  • the cup-shaped cover body 7 may be a thin aluminum cup body.
  • the material of the cup-shaped cover 7 is not particularly limited, and various materials can be used.
  • the inner cylinder wall portion 52 is made of resin, and can be easily melted or burst when the flame-transmitting agent 100 in the fire-transmitting room 8 burns. Therefore, the inner cylinder wall portion 52 may be solid without an opening penetrating in the plate thickness direction.
  • the filter 6 has, for example, a cylindrical shape and is arranged concentrically with the housing 1.
  • the filter 6 can be formed, for example, by stacking stainless steel flat knitted wire mesh in the radial direction and compressing the wire mesh in the radial direction and the axial direction.
  • a cup-shaped cover body 7 mounted on the inner cylinder wall portion 52 is arranged inside the filter 6 at intervals, and is formed between the inner peripheral surface 61 of the filter 6 and the cup-shaped cover body 7.
  • a combustion chamber 10 for accommodating the gas generating agent 120 is formed by the annular space. As the gas generator 120 filled in the combustion chamber 10, a gas generator having a relatively low combustion temperature can be used.
  • the combustion temperature of the gas generating agent 120 can be set, for example, in the range of 1000 to 1700 ° C.
  • known substances including, for example, guanidine nitrate (41% by weight), basic copper nitrate (49% by weight), a binder and additives can be used.
  • the gas generating agent 120 may have various shapes such as granules, pellets, columns, and disks.
  • the upper end surface and the lower end surface of the filter 6 are in contact with the inner wall surfaces of the top plate portion 22 in the upper container 2 and the bottom plate portion 32 in the lower container 3, respectively, and are compressed in the axial direction. It is assembled inside the housing 1. Further, in the example shown in FIG. 1, the outer peripheral surface 62 of the filter 6 is separated from the upper peripheral wall portion 21 and the lower peripheral wall portion 31 of the housing 1, and the outer peripheral surface 62 of the filter 6 and the upper peripheral wall portion 21 are separated from each other. An annular gap 9 is formed in the housing.
  • the filter 6 cools the combustion gas by taking heat of the combustion gas when the combustion gas generated by the combustion of the gas generating agent 120 filled in the combustion chamber 10 passes through. Further, the filter 6 has a function of filtering the combustion gas by collecting the combustion residue contained in the combustion gas, in addition to the function of cooling the combustion gas.
  • FIG. 2 is a diagram illustrating a manufacturing procedure (assembly procedure) of the gas generator 100 in the first embodiment.
  • step S01 the lower container 3 in which the igniter 4 is assembled to the bottom plate portion 32 via the resin holding portion 5 is prepared (preparation step).
  • FIG. 3 is a diagram illustrating a situation corresponding to the preparation process.
  • a subassembly of the gas generator in which each component is assembled to the lower container 3 in the process of manufacturing the gas generator 100 is indicated by reference numeral 1000.
  • the resin holding portion 5 surrounds the base portion 51 for fixing the igniter 4 having the ignition portion 41 in which the ignition charge is housed in the cup body to the bottom plate portion 32, and the ignition portion 41. It has a cylindrical inner cylinder wall portion 52 extending from the base portion 51 toward the opposite side of the bottom plate portion 32.
  • the igniter 4 is made of resin in the previous step. It is integrally assembled with the bottom plate portion 32 of the lower container 3 by molding. Further, the base portion 51 of the resin holding portion 5 and the inner cylinder wall portion 52 are integrally formed by resin molding.
  • step S02 the upper end opening 52A formed at the upper end of the inner cylinder wall portion 52 in the resin holding portion 5 is formed inside the inner cylinder wall portion 52 in an upward posture (upward posture in the gravity direction).
  • the fire transmission room 8 is filled with the heat transfer agent 110 from the upper end opening 52A (fire transmission agent filling step).
  • FIG. 4 is a diagram illustrating a situation corresponding to the explosive charge filling process. As shown in FIG. 4, it is located in a concave space (fire transmission room 8) formed inside the inner cylinder wall portion 52 with the upper end opening 52A of the inner cylinder wall portion 52 in the resin holding portion 5 in an upward posture. A fixed amount of the igniter 110 is filled.
  • the explosive charge filling step is performed with the outer surface 32A of the lower container 3 maintained downward in the direction of gravity.
  • step S03 the top wall portion 71 and the cylindrical side wall portion 72 extending from the top wall portion 71 are included, and both the top wall portion 71 and the side wall portion 72 are oriented in the plate thickness direction.
  • a cup-shaped cover body 7 having no opening through the sill is prepared.
  • the cup-shaped cover body 7 is used. Is attached to the resin holding portion 5 (cover attaching step).
  • 5 and 6 are diagrams illustrating a situation corresponding to the cover mounting process.
  • FIG. 5 shows a situation in which the cup-shaped cover body 7 is brought close to the inner cylinder wall portion 52 in the subassembly 1000 from above.
  • Reference numeral 722 shown in FIG. 5 is a lower end opening formed in the lower end portion 721 of the side wall portion 72.
  • the cup-shaped cover body 7 is brought close to the inner cylinder wall portion 52 in a state where the lower end opening 722 of the cup-shaped cover body 7 faces the upper end opening 52A of the inner cylinder wall portion 52.
  • FIG. 6 shows a state in which the cup-shaped cover body 7 has been attached to the resin holding portion 5.
  • the top wall portion 71 of the cup-shaped cover body 7 covers the upper end opening 52A of the inner cylinder wall portion 52, and the side wall portion 72 is arranged along the inner cylinder wall portion 52.
  • the cup-shaped cover body 7 is attached to the resin holding portion 5.
  • the side wall portion 72 of the cup-shaped cover body 7 is extrapolated to the inner cylinder wall portion 52.
  • the cup-shaped cover body 7 is mounted so as to cover the resin holding portion 5 so that the side wall portion 72 of the cup-shaped cover body 7 faces along the outer peripheral surface 52B of the inner cylinder wall portion 52. ..
  • the inner diameter of the side wall portion 72 of the cup-shaped cover 7 is set to be equal to or slightly smaller than the diameter of the base portion 51 of the resin holding portion 5. Therefore, in the cover mounting step, the lower end portion 721 of the side wall portion 72 of the cup-shaped cover body 7 is press-fitted into the base portion 51. As a result of the cup-shaped cover body 7 being attached to the resin holding portion 5 as described above, the upper end opening 52A of the inner cylinder wall portion 52 is closed by the top wall portion 71 of the cup-shaped cover body 7. As a result, the fire transmission room 8 filled with the fire transmission agent 110 is sealed.
  • the base portion 51 of the resin holding portion 5 is formed into a substantially columnar shape in a state where the resin material is densely packed, the base portion 51 is thicker than the inner cylinder wall portion 52 and is not easily deformed. Therefore, in the cover mounting step, by press-fitting the lower end portion 721 of the side wall portion 72 of the cup-shaped cover body 7 into the base portion 51, the cup-shaped cover body 7 is held in the base portion 51 without wobbling. can do.
  • step S04 the filter 6 is placed at a predetermined position on the inner surface of the bottom plate portion 32 of the lower container 3 (filter mounting step).
  • 7 and 8 are diagrams illustrating a situation corresponding to the filter mounting process.
  • FIG. 7 is a diagram showing a situation during the filter mounting process.
  • FIG. 8 is a diagram showing a situation in which the filter mounting process is completed.
  • the filter 6 is brought closer to the subassembly 1000 from above while the outer surface 32A of the lower container 3 in the subassembly 1000 is maintained downward in the direction of gravity.
  • the inner cylinder wall portion 52 and the cup-shaped cover body 7 attached to the inner cylinder wall portion 52 are inserted into the hollow portion S1 of the filter 6 having a cylindrical shape, and between the inner peripheral surface 61 of the filter 6 and the cup-shaped cover body 7.
  • the filter 6 is installed on the bottom plate portion 32 of the lower container 3 so that the combustion chamber 10 is formed (see FIG. 8).
  • step S05 the gas generating agent is formed in the combustion chamber 10 formed on the outside of the cup-shaped cover 7, that is, the annular gap S1 formed between the cup-shaped cover 7 and the inner peripheral surface 61 of the filter 6. 120 is filled (gas generating agent filling step).
  • FIG. 9 is a diagram illustrating a situation corresponding to the gas generating agent filling process.
  • the gas generating agent 120 is filled into the combustion chamber 10 from above while the outer surface 32A of the lower container 3 in the subassembly 1000 is maintained downward in the direction of gravity.
  • step S06 the upper container 2 is prepared, and the combustion chamber 10 is sealed by integrally joining the lower container 3 and the upper container 2 (sealing step).
  • FIG. 10 is a diagram illustrating a situation corresponding to the sealing process.
  • the sealing step while the outer surface 32A of the lower container 3 in the subassembly 1000 is maintained downward in the direction of gravity, the joint portion 23 of the upper container 2 and the joint portion 33 of the lower container 3 are vertically overlapped with each other.
  • the upper container 2 is put on the lower container 3.
  • the joint portion 23 of the upper container 2 and the joint portion 33 of the lower container 3 that are overlapped with each other are joined by an appropriate joining method such as laser welding.
  • the production (assembly) of the gas generator 100 shown in FIG. 1 is completed.
  • the cup-shaped cover body 7 and the inner cylinder wall portion 52 are housed in such a manner that they can be melted or burst when the gunpowder 100 in the firebox 8 burns. It is assembled in 1.
  • the cup-shaped cover body 7 and the inner cylinder wall portion 52 can be melted or burst by the combustion energy of the flame-transmitting agent 100 when the gas generator 100 is operated.
  • the material used for 52, the thickness of the member, and the like are appropriately selected and set.
  • the internal pressure of the ignition unit 41 rises with the combustion of the igniting agent, and the cup body is cleaved, so that a flame, a high temperature gas, or the like is released from the cleaved portion of the cup body.
  • the ignition unit 41 in the igniter 4 is arranged so as to face the fire transmission room 8 formed inside the inner cylinder wall portion 52 in the resin holding unit 5, the ignition unit 41 is arranged.
  • the igniter 110 is ignited and burned by the flame, high temperature gas, or the like emitted from.
  • the combustion products (flame and high temperature gas) generated by the combustion of the combustion agent 110 are released from the combustion chamber 8 to the combustion chamber 10, and the combustion products are housed in the combustion chamber 10.
  • the gas generator 120 is ignited by coming into contact with the gas generator 120.
  • the combustion energy of the flame-transmitting agent 110 is used to melt or burst the inner cylinder wall portion 52 and the cup-shaped cover body 7 surrounding the fire-transmitting chamber 8.
  • the combustion product produced by the combustion of the propellant 110 omnidirectionally and rapidly from a wide range of the combustion chamber 8 can be discharged to the combustion chamber 10.
  • the combustion product produced by the combustion of the propellant 110 can be rapidly diffused into the combustion chamber 10, and the ignitability of the gas generating agent 120 can be improved. Therefore, it is possible to prevent the ignition delay of the gas generating agent 120 in the entire combustion chamber 10 from occurring.
  • the high-temperature, high-pressure combustion gas generated by the combustion of the gas generator 120 in the combustion chamber 10 passes through the filter 6. At that time, the combustion gas is cooled and the combustion residue contained in the combustion gas is collected by the filter 6.
  • the combustion gas cooled and filtered when passing through the filter 6 passes through the gap 9 formed between the outer peripheral surface 62 of the filter 6 and the upper peripheral wall portion 21 and the lower peripheral wall portion 31, and passes through the sealing tape 11A. It breaks and is discharged from the gas discharge hole 11 to the outside of the housing 1.
  • the combustion gas thus discharged to the outside from the gas discharge hole 11 of the housing 1 is introduced into an airbag (not shown) in the airbag device and used for expanding and deploying the airbag.
  • the ignitability of the gas generator 120 in the combustion chamber 10 can be improved and the gas generator 120 can be ignited quickly as described above, so that the gas generator 100 can be quickly ignited. Can be activated. By realizing the rapid operation performance of the gas generator 100 in this way, it is possible to suppress the delay in the supply of gas to the airbag when the gas generator 100 is operated.
  • FIGS. 11 and 12 are diagrams illustrating a conventional procedure for assembling a gas generator.
  • FIG. 11 shows a situation in which the bottomed tubular cup 700 is attached to the lower container 3A to which the igniter 4A is assembled after the inside of the bottomed tubular cup 700 is filled with the gunpowder 110A.
  • the bottomed tubular cup 700 has a discharge hole 70 for discharging the combustion product to the outer combustion chamber when the combustion agent 110A is burned.
  • the discharge hole 70 is closed with, for example, sealing tape.
  • the outer surface 32B of the lower container 3A is directed upward in the direction of gravity and the igniter. It shows a situation where the bottomed cylindrical cup 700 is attached to the lower container 3A from below with the 4A facing downward in the direction of gravity.
  • the igniter 110A and the igniter 4A filled in the bottomed tubular cup 700 are pressed against each other, so that the igniter 4A is used. There is a concern that it may be damaged or the explosive 110A may be crushed.
  • FIG. 12 shows a situation in which the combustion chamber 10A is filled with the gas generating agent 120A. That is, in the conventional procedure for assembling the gas generator, as shown in FIG. 11, after mounting the bottomed cylindrical cup 700 filled with the explosive agent 110A on the lower container 3A, the lower container 3A is turned upside down. .. Then, as shown in FIG. 12, in a state where the outer surface 32B of the lower container 3A is maintained downward in the direction of gravity, the filter 6A is installed in the lower container 3A, and then in the combustion chamber 10A formed inside the filter 6A. Fill with the gas generating agent 120A.
  • the above-mentioned igniter filling step, cover mounting step, filter mounting step, and gas generating agent filling are performed.
  • the gas generator semi-assembly 1000 is assembled without turning it upside down even once in the middle of the process, and the parts are assembled while the vertical posture of the semi-assembly 1000 is kept constant. It can be carried out. That is, after the lower container 3 after assembling the igniter 4 is prepared in the preparation step, the explosive charge filling step, the cover mounting step, and the filter mounting step are performed with the outer surface 32A of the lower container 3 facing downward in the direction of gravity.
  • the gas generating agent filling step and the sealing step can be performed.
  • the man-hours for assembling the gas generator 100 can be reduced as compared with the conventional case, and the gas generator 100 can be easily assembled.
  • the manufacturing efficiency when manufacturing the gas generator 100 can be improved as compared with the conventional case, and the tact time, the cycle time, and the like can be shortened.
  • the fire-transmitting agent 110 is passed through the upper end opening 52A from above into the fire-transmitting room 8 formed inside the inner cylinder wall portion 52. Since it is only necessary to pour, it is possible to prevent the ignition portion 41 of the igniter 4 arranged so as to face the fire transmission room 8 from being damaged or the igniter 110 from being crushed. Further, also in the subsequent cover mounting step, the cup-shaped cover body 7 may be mounted by being press-fitted into the base portion 51 while being externally inserted into the inner cylinder wall portion 52 of the resin holding portion 5, and thus the fire transmission chamber 8 is filled.
  • the gas generator 100 and the manufacturing method thereof in the present embodiment it is possible to suppress the ignition delay of the gas generator 120 and improve the manufacturing efficiency as compared with the conventional case.
  • the inner cylinder wall portion 52 of the resin holding portion 5 in the gas generator 100 is externally inserted with the side wall portion 72 of the cup-shaped cover body 7 in the cover mounting process as described above. Therefore, the inner cylinder wall portion 52 is strong and rigid enough to hold the fire transmission charge 110 until the cup-shaped cover body 7 is attached to the inner cylinder wall portion 52 after the fire transmission chamber 8 is filled with the transmission charge 110. You only need to have at least. In other words, when the fire transmission room 8 formed inside the inner cylinder wall portion 52 is filled with the fire transmission charge 110, the posture may be tilted by the force of the fire transmission charge 110 to push the inner cylinder wall portion 52 apart. It suffices that the inner cylinder wall portion 52 possesses strength and rigidity to the extent that it does not deform. Therefore, the strength of the inner cylinder wall portion 52 may be lower than that of the cup-shaped cover body 7.
  • the member thickness of the inner cylinder wall portion 52 in the resin holding portion 5 can be made very thin, and the output of the gas generator 100 can be made even if the member thickness varies. It is acceptable without any substantial impact on performance.
  • reducing the member thickness of the inner cylinder wall portion 52 means that the inner cylinder wall portion 52 is melted or burst more quickly and easily by the combustion energy of the explosive charge 110 when the gas generator 100 is operated. Contribute to. This makes it possible to further improve the ignitability of the gas generating agent 120.
  • the inner cylinder wall portion 52 of the resin holding portion 5 is not required to have high molding accuracy, the tact time during manufacturing of the gas generator 100 can be further shortened, and the manufacturing efficiency is improved.
  • the base portion 51 and the inner cylinder wall portion 52 of the resin holding portion 5 are integrally molded with a resin material.
  • it has a base portion 51 having a function of fixing the igniter 4 to the lower container 3 and a function of forming a fire transmission room 8 inside and holding the fire transmission agent 110 filled in the fire transmission room 8.
  • FIG. 13 is a diagram showing the internal structure of the gas generator 100A according to the first modification of the first embodiment.
  • the shape of the cup-shaped cover body 7A is different from that of the cup-shaped cover body 7 described with reference to FIG.
  • the inner cylinder wall portion 52 in the resin holding portion 5 has a cylindrical shape.
  • the cup-shaped cover body 7A is integrally composed of a top wall portion 71A having a circular plan view and a cylindrical side wall portion 72A extending downward from the top wall portion 71A toward the bottom plate portion 32. Has been done.
  • the lower end portion 721 of the side wall portion 72A of the cup-shaped cover body 7A has an enlarged diameter.
  • the cup-shaped cover body 7A By configuring the cup-shaped cover body 7A in this way, when the cup-shaped cover body 7A is attached to the resin holding portion 5, the side wall portion 72A can be easily fitted into the inner cylinder wall portion 52. Therefore, the workability at the time of assembling the gas generator 100A can be improved.
  • FIG. 14 shows a top view of the cup-shaped cover body 7A according to the first modification.
  • the top wall portion 71A of the cup-shaped cover body 7A is projected from the peripheral edge portion 711 in which the top wall portion 71A is connected to the side wall portion 72A toward the top plate portion 22 and is deformed by bending. It is configured to include a protruding portion 712 whose degree of protrusion from the peripheral portion 711 can be changed.
  • the peripheral edge portion 711 may be formed as a flat surface, and the protruding portion 712 may be dome-shaped and bulged upward from the peripheral edge portion 711.
  • the protruding portion 712 may be dome-shaped and bulged upward from the peripheral edge portion 711.
  • the protruding portion 712 of the top wall portion 71A of the cup-shaped cover body 7A is in contact with the top plate portion 22 of the upper container 2, and the protruding portion 712 is in a state of being bent and deformed. .. That is, in the state after the gas generator 100A is assembled, the protruding portion 712 in the top wall portion 71A of the cup-shaped cover body 7A may have a smaller degree of protrusion from the peripheral portion 711 than in the original shape.
  • the dimensions of the cup-shaped cover body 7A, the base portion 51 in the resin holding portion 5, the inner cylinder wall portion 52, and the like can absorb tolerances and the like. Further, after the gas generator 100A is assembled, the protruding portion 712 of the cup-shaped cover body 7A is in contact with the top plate portion 22 of the upper container 2 in a state of being bent and deformed, so that the cup-shaped cover body 7A is in contact with the top plate portion 22. It is possible to prevent rattling and suitably suppress the generation of abnormal noise and the like.
  • cup-shaped cover body 7A in this modification does not have an opening that penetrates the top wall portion 71A and the side wall portion 72 in the plate thickness direction, and the explosive agent 110 is operated when the gas generator 100A is operated. Is exhausted by melting or exploding due to the heat energy when it burns.
  • FIG. 15 is a diagram showing the internal structure of the gas generator 100B according to the second modification of the first embodiment.
  • the cup-shaped cover body 7B has a top wall portion 71 and a side wall portion 72 similar to the cup-shaped cover body 7 shown in FIG.
  • the cup-shaped cover body 7B is different from the cup-shaped cover body 7 shown in FIG. 1 in that the side wall portion 72 is inserted into the inner cylinder wall portion 52.
  • the cup-shaped cover body 7B is attached to the inner cylinder wall portion 52 so that the side wall portion 72 of the cup-shaped cover body 7B faces the inner peripheral surface 52C of the inner cylinder wall portion 52. There is.
  • cup-shaped cover body 7B in this modification does not have an opening that penetrates the top wall portion 71 and the side wall portion 72 in the plate thickness direction, and the heat transfer agent 110 is operated when the gas generator 100B is operated. Is exhausted by melting or exploding due to the heat energy when it burns.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
PCT/JP2020/047969 2020-06-02 2020-12-22 ガス発生器及びその製造方法 WO2021245967A1 (ja)

Priority Applications (2)

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DE112020007278.9T DE112020007278T5 (de) 2020-06-02 2020-12-22 Gasgenerator und Herstellungsverfahren dafür
CN202080101599.1A CN115697784A (zh) 2020-06-02 2020-12-22 气体发生器及其制造方法

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JP2020096206A JP2021187363A (ja) 2020-06-02 2020-06-02 ガス発生器及びその製造方法
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0885411A (ja) * 1994-09-13 1996-04-02 Trw Inc 圧力センサを備えたエアバッグ膨張器
JP2002090097A (ja) * 2000-07-12 2002-03-27 Daicel Chem Ind Ltd イニシエータ組立体及びこれを用いたガス発生器
JP2010126089A (ja) * 2008-11-28 2010-06-10 Autoliv Nichiyu Co Ltd エアバッグ用インフレータ
WO2014157648A1 (ja) * 2013-03-29 2014-10-02 日本化薬株式会社 ガス発生器
JP2019018783A (ja) * 2017-07-20 2019-02-07 株式会社ダイセル ガス発生器

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005007611U1 (de) 2005-05-13 2005-09-22 Trw Airbag Systems Gmbh Gasgenerator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0885411A (ja) * 1994-09-13 1996-04-02 Trw Inc 圧力センサを備えたエアバッグ膨張器
JP2002090097A (ja) * 2000-07-12 2002-03-27 Daicel Chem Ind Ltd イニシエータ組立体及びこれを用いたガス発生器
JP2010126089A (ja) * 2008-11-28 2010-06-10 Autoliv Nichiyu Co Ltd エアバッグ用インフレータ
WO2014157648A1 (ja) * 2013-03-29 2014-10-02 日本化薬株式会社 ガス発生器
JP2019018783A (ja) * 2017-07-20 2019-02-07 株式会社ダイセル ガス発生器

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