WO2023084826A1 - ガス発生器用フィルタユニット、ガス発生器、及びガス発生器の製造方法 - Google Patents

ガス発生器用フィルタユニット、ガス発生器、及びガス発生器の製造方法 Download PDF

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Publication number
WO2023084826A1
WO2023084826A1 PCT/JP2022/024335 JP2022024335W WO2023084826A1 WO 2023084826 A1 WO2023084826 A1 WO 2023084826A1 JP 2022024335 W JP2022024335 W JP 2022024335W WO 2023084826 A1 WO2023084826 A1 WO 2023084826A1
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WO
WIPO (PCT)
Prior art keywords
filter
combustion chamber
housing
peripheral wall
gas
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/JP2022/024335
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English (en)
French (fr)
Japanese (ja)
Inventor
智也 佐々木
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.)
Daicel Corp
Original Assignee
Daicel Corp
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 Daicel Corp filed Critical Daicel Corp
Priority to EP22892329.8A priority Critical patent/EP4431346A4/en
Priority to CN202280071869.8A priority patent/CN118159452A/zh
Publication of WO2023084826A1 publication Critical patent/WO2023084826A1/ja
Priority to US18/660,252 priority patent/US12286073B2/en
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • B01D39/12—Filter screens essentially made of metal of wire gauze; of knitted wire; of expanded metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • 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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/069—Special geometry of layers
    • B01D2239/0695—Wound layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/10—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air bags, e.g. inflators therefor
    • 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

Definitions

  • the present invention relates to a gas generator filter unit, a gas generator, and a method for manufacturing a gas generator.
  • a long cylindrical gas generator including a combustion chamber housing unit containing a gas generating agent therein, and a filter housing containing a filter inside and assembled to one end of the combustion chamber housing unit.
  • the combustion chamber housing unit has, for example, a long cylindrical metal combustion chamber housing, and a combustion chamber for containing a gas generating agent is formed therein. Further, for example, an igniter for igniting the gas generating agent accommodated in the combustion chamber is attached to the other end side of the combustion chamber housing.
  • the filter housing is formed with a gas outlet for discharging combustion gas generated by combustion of the gas generating agent to the outside.
  • the combustion gas generated in the combustion chamber housing unit is cooled by passing through the filter before being discharged from the gas outlet, and slag (residue) contained in the combustion gas is captured by the filter. be collected.
  • a filter housing 51 containing a filter 37 is assembled with a container 41 containing a gas generating agent 52 .
  • the filter 37 accommodated in the filter housing 51 is positioned only after the filter housing 51 is assembled with the container 41 . Therefore, before the filter housing 51 is attached to the container 41, the filter 37 is not fixed in the filter housing 51 and is not unitized. As a result, during the manufacturing process of the gas generator, the filter 37 tends to fall off from the filter housing 51 and is difficult to handle.
  • the technology of the present disclosure has been made in view of the above-described circumstances, and its purpose is to provide a technology related to a gas generator filter unit suitable for manufacturing gas generators.
  • a filter unit for a gas generator for solving the above problems includes a filter having a columnar outer shape, and a filter housing that accommodates the filter in a filter accommodation space formed inside the filter while coaxially positioning and fixing the filter. and a first restraining end disposed at one end of the filter housing as a closed surface and restraining one axial end surface of the filter, and a gas inlet at the other end of the filter housing. a second restraint end arranged to surround the periphery and restraining the other axial end face of the filter; connecting between the first restraint end and the second restraint end; and having a gas discharge port.
  • a peripheral wall portion wherein the first restraint end portion, the second restraint end portion, and the circumferential wall portion are integrally formed, and the circumferential wall portion restrains the circumferential surface of the filter. and an unconstrained peripheral wall portion on which the gas outlet is arranged and which is spaced apart from the peripheral surface of the filter so as to form an annular gap with the peripheral surface of the filter.
  • the second restraining end portion may be formed by an annular flange in which the end portion of the peripheral wall portion is folded toward the filter housing space.
  • the peripheral wall portion includes a small diameter portion and a large diameter portion having an outer diameter larger than that of the small diameter portion, the restricted peripheral wall portion is formed by the small diameter portion, and the unrestrained peripheral wall portion is the large diameter portion may be formed by
  • the constrained peripheral wall portion may be formed on both one end side and the other end side in the axial direction of the peripheral wall portion, and the non-restrained peripheral wall portion may be formed between the pair of constrained peripheral wall portions.
  • the filter may have a cylindrical shape with a hollow portion formed along the axial direction, and the second restraint end may cover the entire end surface of the filter.
  • the filter may have a cylindrical shape with a hollow portion formed along the axial direction, and the diameter of the gas inlet may be equal to or smaller than the inner diameter of the filter. .
  • a plurality of gas outlets may be formed in the peripheral wall portion, and a total opening area of the plurality of gas outlets may be larger than an opening area of the gas inlet.
  • the technology according to the present disclosure can also be specified as a gas generator. That is, the gas generator according to the present disclosure includes a combustion chamber housing having a cylindrical combustion chamber housing in which a combustion chamber containing a gas generating agent is formed, and an igniter attached to the combustion chamber housing. and any one of the gas generator filter units described above assembled to one end of the combustion chamber housing, wherein the gas inlet of the filter housing is arranged to face the combustion chamber.
  • the gas generator includes a combustion chamber housing having a cylindrical combustion chamber housing in which a combustion chamber containing a gas generating agent is formed, and an igniter attached to the combustion chamber housing. and a gas generator filter unit assembled to one end of the combustion chamber housing, wherein the filter housing has an annular stepped portion between the small diameter portion and the large diameter portion, and the filter The small-diameter portion of the housing is inserted into one end of the combustion chamber housing so that the gas inlet faces the combustion chamber, and the annular stepped portion abuts an open end face on the one end side of the combustion chamber housing. may be in contact with each other.
  • a method for manufacturing a gas generator according to the present disclosure is for a gas generator including a filter having a columnar outer shape and a filter housing that accommodates the filter in a filter accommodating space formed inside thereof while coaxially positioning and fixing the filter.
  • a step of preparing a filter unit a step of preparing a combustion chamber housing unit having a cylindrical combustion chamber housing in which a combustion chamber containing a gas generating agent is formed and an igniter attached to the combustion chamber housing. and assembling the gas generator filter unit to one end of the combustion chamber housing, wherein the filter housing is integrally formed with a first restraint end, a second restraint end, and the first restraint end.
  • a peripheral wall portion connecting between the constrained end portion and the second constrained end portion comprising a non-constrained peripheral wall portion in which a gas discharge port is arranged, and a constrained peripheral wall that constrains the peripheral surface of the filter.
  • one axial end face of the filter is constrained by arranging the first constraining end portion as a closed surface at one end of the filter housing, and By arranging the second constrained end portion at the other end of the filter housing so as to surround the gas inlet, the other axial end surface of the filter is constrained, and the non-constrained peripheral wall portion is aligned with the peripheral surface of the filter.
  • the peripheral surface of the filter is constrained by the constraining peripheral wall portion while being spaced apart from the peripheral surface so as to form an annular gap therebetween.
  • FIG. 1 is a schematic axial cross-sectional view showing an example of a gas generator according to Embodiment 1.
  • FIG. FIG. 2 is a diagram for explaining the detailed structure of the filter unit.
  • FIG. 3 is a chart for explaining the procedure of the method for manufacturing the gas generator.
  • FIG. 4 is a diagram for explaining the situation of the filter unit preparation process.
  • FIG. 5 is a diagram for explaining the state of the assembly process.
  • FIG. 6 is a diagram illustrating an installation example of a sealing member and a perforated member installed at the second constraining end of the filter housing.
  • FIG. 1 is a schematic axial cross-sectional view showing an example of a gas generator according to Embodiment 1.
  • the gas generator 1 can be used, for example, as a gas generator for inflating an airbag.
  • the gas generator 1 shown in FIG. 1 includes a combustion chamber housing unit 10 and a filter unit 4 (gas generator filter unit) assembled integrally with the combustion chamber housing unit 10 .
  • the combustion chamber housing unit 10 has a cylindrical combustion chamber housing 2, and the filter unit 4 is attached to one end side of the combustion chamber housing 2 in the axial direction.
  • An igniter 3 is attached to the other end of the combustion chamber housing 2 in the axial direction.
  • the end of the combustion chamber housing 2 to which the filter unit 4 is attached is referred to as a first end 2A
  • the end to which the igniter 3 is attached is referred to as a second end 2B.
  • a first end portion 2A and a second end portion 2B of the combustion chamber housing 2 are open ends, which are closed by the filter unit 4 and the igniter 3 .
  • the combustion chamber housing 2 may be made of metal.
  • Reference numeral 2C denotes an open end surface of the first end portion 2A of the combustion chamber housing 2. As shown in FIG.
  • the igniter 3 is, for example, an electric ignition type igniter, and one used in a known gas generator can be adopted.
  • the igniter 3 has a metal cup body 31 that contains and seals an ignition charge, and a pair of conductive pins 32, 32 for receiving current supply from the outside. It is fixed to the igniter holding portion 33 of , via a resin member 34 .
  • the igniter holding portion 33 of the igniter 3 may be welded to, for example, an opening on the other axial end side of the combustion chamber housing 2 . At that time, the igniter holding part 33 may be joined to the opening of the combustion chamber housing by all-around welding, whereby the welding can be performed airtightly.
  • a cup-shaped partition (retainer) 5 is arranged inside the combustion chamber housing 2 at a predetermined distance from the igniter 3 .
  • the partition wall 5 is arranged at a portion of the combustion chamber housing 2 near the second end 2B, as shown in FIG.
  • the partition wall 5 has a stepped bottomed cylindrical shape as a whole.
  • a side portion of the partition wall 5 includes a large diameter portion 51 having a relatively large diameter and a small diameter portion 52 having a relatively small diameter, and a bottom portion 53 is connected to the small diameter portion 52 .
  • the outer diameter of the large-diameter portion 51 of the partition wall 5 is substantially the same as the inner diameter of the combustion chamber housing 2 , and the large-diameter portion 51 is fixed to the inner peripheral surface of the combustion chamber housing 2 .
  • the large-diameter portion 51 of the partition wall 5 may be welded to the inner peripheral surface of the combustion chamber housing 2, or may be fixed by another method.
  • At least one communicating hole 54 having an arbitrary shape is formed in the bottom portion 53 of the partition wall 5 so as to penetrate the bottom portion 53 .
  • the partition wall 5 arranged as described above divides the interior of the combustion chamber housing 2 into a transfer chamber (enhancer chamber) 21 and a combustion chamber 22 .
  • a transfer chamber 21 is formed between the igniter 3 and the partition 5
  • a combustion chamber 22 is formed between the partition 5 and the filter unit 4 .
  • the cup body 31 of the igniter 3 is arranged facing the inside of the transfer chamber 21 .
  • a transfer charge (enhancer agent) 61 is accommodated in the transfer chamber 21 formed inside the combustion chamber housing 2 . Further, the combustion chamber 22 contains a gas generating agent 62 .
  • the transfer charge 61 and the gas generating agent 62 are not particularly limited, and various ones applied to known gas generators can be used.
  • Transfer charge 61 and gas generant 62 comprise known compositions, such as, for example, formed of guanidine nitrate (41% by weight), basic copper nitrate (49% by weight), and binders and additives.
  • the shape of each transfer charge 61 and gas generating agent 62 may be, for example, a pellet shape, a disk shape, a columnar shape, or a single-hole columnar shape having a through hole.
  • the transfer charge 61 and the gas generating agent 62 may be gas generating agents of the same kind, the same shape and the same size, or may be of different kinds, different shapes and different sizes.
  • the transfer charge 61 may not be filled in the transfer chamber 21 and the igniter 3 may be used to directly ignite the gas generating agent 62 in the combustion chamber 22 .
  • the partition wall 5 does not have to be installed inside the combustion chamber housing 2 .
  • a connector (not shown) is connected to the pair of conductive pins 32, 32 of the igniter 3 when the gas generator 1 is assembled to, for example, an airbag system of a vehicle. Power supply is possible.
  • a sensor not shown in the airbag device senses an impact due to a collision with a vehicle or the like
  • an ignition current is supplied to the pair of conductive pins 32, 32, and ignition is performed.
  • Device 3 is activated.
  • the ignition charge accommodated in the cup body 31 of the igniter 3 is combusted, and combustion products such as flame and high-temperature gas are generated.
  • the transfer charge 61 contained in the transfer charge chamber 21 is ignited, and combustion of the transfer charge 61 produces combustion gas as a combustion product.
  • the communication hole 54 is formed in the bottom portion 53 of the partition wall 5 . Therefore, the combustion gas of the transfer charge 61 flows into the combustion chamber 22 through the communication hole 54 of the partition wall 5 .
  • the gas generating agent 62 housed in the combustion chamber 22 is ignited, and combustion gas is generated by burning the gas generating agent 62 .
  • Combustion gas generated by combustion of the gas generating agent 62 passes through the filter 7 of the filter unit 4 attached to the first end 2A of the combustion chamber housing 2, and then is discharged to the outside from the gas discharge port 46.
  • the filter 7 cools the combustion gas of the gas generating agent 62 and collects slag (residue) and the like contained in the combustion gas.
  • FIG. 2 is a diagram for explaining the detailed structure of the filter unit 4.
  • the filter unit 4 includes a columnar filter 7 and a filter housing 40 that accommodates the filter 7 .
  • the filter housing 40 is a cylindrical (cup-shaped) member with a bottom attached so as to block the opening (open end) of the first end 2A in the combustion chamber housing 2, and the filter 7 is placed inside (inside) thereof.
  • a filter housing space for housing is formed.
  • the filter housing 40 accommodates the filter 7 in its inside (filter accommodation space) in a coaxially positioned and fixed state.
  • the filter 7 has a cylindrical shape and is formed with a hollow portion 71 penetrating along the axial direction.
  • the filter 7 need not have a cylindrical shape, and may have another shape. Further, the filter 7 may not have the hollow portion 71 and may be a solid filter member.
  • Reference numeral 72 in the drawing denotes a first end face (one end face in the axial direction) located on one end side of the filter 7 in the axial direction.
  • Reference numeral 73 denotes a second end surface (other axial end surface) located on the other end side of the filter 7 in the axial direction.
  • Reference numeral 74 denotes the outer peripheral surface of the filter 7.
  • the filter 7 may be formed by molding a metal wire.
  • the filter 7 may be manufactured by putting flat-knitted metal wires into a mold and compressing and molding them into a cylindrical shape.
  • the filter 7 may be formed into a cylindrical shape by winding a metal wire material around a rod-shaped core material in multiple layers and then pulling out the core material. Of course, these are examples of the filter 7, and are not limited to these.
  • the filter housing 40 includes a peripheral wall portion 41 , a first restraining end portion 42 arranged on one end side of the peripheral wall portion 41 , and a second restraining end portion arranged on the other end side of the peripheral wall portion 41 . It is configured including an end portion 43 .
  • the end on which the first restraint end 42 is formed is called a first end 40A
  • the end on which the second restraint end 43 is formed is called a second end. Call it 40B.
  • the peripheral wall portion 41, the first restraint end portion 42, and the second restraint end portion 43 of the filter housing 40 are integrally formed.
  • the first restraint end portion 42 arranged on one end side (first end 40A side) of the peripheral wall portion 41 in the filter housing 40 is formed as a closed surface.
  • the second restraint end portion 43 arranged on the other end side (second end 40B side) of the peripheral wall portion 41 is formed as an annular flange arranged so as to surround the gas inlet 44 .
  • the gas inlet 44 is an opening for allowing the combustion gas of the gas generating agent 62 generated in the combustion chamber housing unit 10 to flow into the filter housing 40 (filter housing space).
  • the gas inlet 44 is provided in the form of a single hole having a circular cross-section, the center of which is coaxial with the central axis of the filter housing 40 .
  • the peripheral wall portion 41 includes small diameter portions 411 and 412 formed on both one end side and the other end side in the axial direction, and a large diameter portion 413 formed between the small diameter portions 411 and 412 . More specifically, annular stepped portions 414 and 415 are formed between the small diameter portions 411 and 412 and the large diameter portion 413 to connect them.
  • the small diameter portions 411 and 412 have relatively smaller outer diameters than the large diameter portion 413 , and the large diameter portion 413 has an outer diameter one size larger than the small diameter portions 411 and 412 .
  • the filter housing 40 has a small diameter portion 412 located on the second end 40B side inserted into the first end 2A (one end) of the combustion chamber housing 2 so that the gas inlet 44 faces the combustion chamber 22. , is fixed to the combustion chamber housing 2 in this state.
  • the combustion of the combustion chamber housing unit 10 is The amount of insertion of the small diameter portion 412 into the first end portion 2A of the combustion chamber housing 2 can be adjusted according to the amount of the gas generating agent 62 contained in the chamber 22 . As a result, the volume of the combustion chamber 22 can be appropriately adjusted according to the amount of the gas generating agent 62 .
  • the gas generating agent 62 does not excessively move around in the combustion chamber 22 even when it is subjected to vibrations, etc., and the generation of abnormal noise caused by this is prevented. can be suppressed.
  • the method of fixing the filter housing 40 to the combustion chamber housing 2 is not particularly limited.
  • the portion 2A and the filter housing 40 may be welded (for example, all-around welded).
  • the outer diameter of the small diameter portion 412 of the filter housing 40 may be designed to be equal to or slightly smaller than the inner diameter of the combustion chamber housing 2 at the first end 2A.
  • the outer diameter of the small diameter portion 412 of the filter housing 40 is designed to be slightly larger than the inner diameter of the first end portion 2A of the combustion chamber housing 2, and the small diameter portion 412 is provided inside the first end portion 2A as a sealing member.
  • the filter housing 40 may be fixed to the combustion chamber housing 2 by being press-fitted through the .
  • the filter unit 4 has an annular step connecting the small diameter portion 412 and the large diameter portion 413 in a state where the small diameter portion 412 of the filter housing 40 is inserted into the first end portion 2A of the combustion chamber housing 2.
  • the portion 415 may be in contact with the open end surface 2C of the first end portion 2A of the combustion chamber housing 2 .
  • the small diameter portion 412 of the filter housing 40 is inserted into the first end portion 2A of the combustion chamber housing 2, and the annular stepped portion 415 contacts the opening end surface 2C. This interpolation work is completed at the point of contact.
  • the filter unit 4 when the filter unit 4 is assembled, the insertion amount of the small-diameter portion 412 in the filter housing 40 with respect to the combustion chamber housing 2 can be made constant. As a result, when assembling gas generators of the same specification, it is possible to suppress variation in the volume of the combustion chamber 22 for each product.
  • the small diameter portions 411 and 412 of the peripheral wall portion 41 abut against the outer peripheral surface 74 of the filter 7 when the filter 7 is accommodated in the filter housing 40 (filter accommodation space). ing. Accordingly, the small-diameter portions 411 and 412 of the peripheral wall portion 41 function as a "constraining peripheral wall portion" that constrains the outer peripheral surface 74 of the filter 7 in the transverse cross-sectional direction (radial direction) within the filter housing 40 (filter housing space). According to this, rattling of the filter 7 in the filter housing 40 (filter housing space) can be suppressed.
  • the inner diameters of the small-diameter portions 411 and 412 may be slightly smaller than the outer diameter of the filter 7 (in its original form) before the filter 7 is housed in the filter housing 40 (filter housing space).
  • the filter 7 can be housed in the filter housing 40 (filter housing space) in a state where the filter 7 is compressed in the transverse direction (radial direction) by the small-diameter portions 411 and 412. 7 can be more suitably suppressed.
  • the inner diameter of the large diameter portion 413 in the peripheral wall portion 41 of the filter housing 40 is larger than the outer diameter of the filter 7 . Therefore, as shown in FIG. 2, when the filter 7 is accommodated in the filter housing 40 (filter accommodation space), the inner peripheral surface of the large diameter portion 413 is arranged apart from the outer peripheral surface 74 of the filter 7. there is Furthermore, along with this, an annular gap 45 is formed between the outer peripheral surface 74 of the filter 7 and the inner peripheral surface of the large diameter portion 413 . The central axis of this annular gap 45 is coaxial with the central axis of the filter housing 40, for example.
  • the large diameter portion 413 of the peripheral wall portion 41 is provided with a gas discharge port 46 for discharging the combustion gas of the gas generating agent 62 to the outside of the filter housing 40 .
  • the filter unit 4 in this embodiment receives the combustion gas of the gas generating agent 62 generated in the combustion chamber 22 of the combustion chamber housing unit 10 from the gas inlet 44 arranged facing the combustion chamber 22, and filters It leads to the hollow portion 71 of the filter 7 housed in the housing 40 (filter housing space).
  • the combustion gas introduced into the hollow portion 71 of the filter 7 sequentially passes through the filter 7 and the annular gap 45 and is discharged to the outside from the gas discharge port 46 formed in the large diameter portion 413 of the peripheral wall portion 41. be.
  • the gas discharge port 46 is arranged in the large-diameter portion 413 surrounding the annular gap 45 . According to this, the gas discharge port 46 can be directly communicated with the annular gap 45 , and the combustion gas can be smoothly discharged from the gas discharge port 46 .
  • the large-diameter portion 413 of the peripheral wall portion 41 that is spaced apart from and opposed to the outer peripheral surface 74 of the filter 7 functions as an "unrestrained peripheral wall portion" that does not restrict the filter 7 in the radial direction.
  • the number, position, size, shape, arrangement pattern, and other aspects of the gas discharge ports 46 provided in the large-diameter portion 413 of the peripheral wall portion 41 are not particularly limited. They are arranged at predetermined intervals along the circumferential direction of the large-diameter portion 413 .
  • the second restraint end portion 43 of the filter housing 40 is formed by an annular flange formed by folding the end portion of the peripheral wall portion 41 toward the filter housing space.
  • An inner surface 42A of the first restraint end portion 42 formed as a closed surface and an inner surface 43A of the second restraint end portion 43 formed as an annular flange are opposed to each other across the filter accommodating space.
  • the inner surface 42A of the first restraint end portion 42 contacts the first end surface (one end surface in the axial direction) 72 of the filter 7, and the second The inner surface 43A of the restraining end portion 43 is in contact with the second end surface (other axial end surface) 73 of the filter 7 . That is, the filter 7 is restrained in the axial direction by sandwiching the filter 7 between the first restraint end portion 42 and the second restraint end portion 43 from both sides in the axial direction of the filter housing 40 .
  • the distance between the inner surface 42A of the first restraint end portion 42 and the inner surface 43A of the second restraint end portion 43 is the axial length of the filter 7 before being housed in the filter housing 40 (filter housing space).
  • the filter 7 can be housed in the filter housing 40 (filter housing space) in a state in which the filter 7 is axially compressed by the first restraint end portion 42 and the second restraint end portion 43 .
  • rattling of the filter 7 or the above-described short-pass of the combustion gas can be more preferably suppressed.
  • the inner surface 42A of the first restraint end portion 42 of the filter housing 40 and the first end surface (one end surface in the axial direction) 72 of the filter 7 are in indirect contact with each other by interposing a sealing material such as a gasket therebetween.
  • a sealing material such as a gasket therebetween.
  • the inner surface 43A of the second restraint end portion 43 and the second end surface (the other end surface in the axial direction) 73 of the filter 7 may be in indirect contact with each other by interposing a sealing material such as a gasket therebetween.
  • the diameter of the gas inlet 44 is equal to or smaller than the inner diameter of the filter 7 .
  • the inner diameter of the filter 7 referred to here is the diameter of the hollow portion 71 formed in the filter 7 .
  • the second restraint end 43 which is an annular flange surrounding the gas inlet 44, is positioned against the second end surface 73 of the filter 7 (the end surface facing the second restraint end 43). The whole is covered.
  • the high-temperature combustion gas with a high flow velocity is suppressed from directly colliding with the second end surface 73 of the filter 7 .
  • damage to the second end surface 73 of the filter 7 can be suitably suppressed.
  • the output of the combustion gas discharged from the gas discharge port 46 of the filter unit 4 is either the total opening area of the gas discharge port 46 or the opening area of the gas inlet 44. or the smaller one.
  • the total opening area of the gas discharge ports 46 is the sum of the opening areas of the gas discharge ports 46 when the plurality of gas discharge ports 46 are arranged in the large diameter portion 413 of the peripheral wall portion 41 of the filter housing 40 .
  • the greater the number of gas discharge ports 46 the more the gas discharge ports 46 are arranged, assuming that the processing tolerance generated per gas discharge port 46 is the same.
  • the total processing tolerance will increase. Therefore, when a plurality of gas discharge ports 46 are arranged in the large-diameter portion 413 of the peripheral wall portion 41 , the output of the gas generator 1 (that is, the amount of gas supplied to the airbag device) is rate-determined by the opening area of the gas inlet 44 . It is easier to adjust the output of the gas generator 1 if the Therefore, when a plurality of gas discharge ports 46 are arranged in the large diameter portion 413 of the peripheral wall portion 41 of the filter housing 40, the total opening area of the plurality of gas discharge ports 46 should be larger than the opening area of the gas inlet 44. is preferred. By doing so, it is advantageous for the stability of the output of the gas generator 1, and the fluctuation of the output can be suppressed.
  • step S01 the filter unit 4 described above is prepared (filter unit preparation step).
  • FIG. 4 is a diagram explaining the situation of the filter unit preparation process.
  • a filter housing intermediate body 400 having one open end 401 is prepared.
  • the filter housing intermediate 400 is similar to the filter housing 40 described in FIG. 2, except that the second restraint end 43 is not folded into the filter housing space. In other words, the filter housing intermediate 400 corresponds to the filter housing 40 before the second restraint end 43 is folded.
  • the filter 7 is inserted from the open end 401 side into the filter housing space formed inside the filter housing intermediate body 400 (middle in FIG. 4).
  • the inner diameters of the small diameter portions 411 and 412 of the peripheral wall portion 41 of the filter housing intermediate body 400 are set slightly smaller than the outer diameter of the filter 7 before it is housed in the filter housing space.
  • the filter 7 is press-fitted into the small diameter portions 411 and 412 of the peripheral wall portion 41 .
  • the filter 7 is radially compressed by the small diameter portions 411 and 412 (restricted peripheral wall portions) of the peripheral wall portion 41, and the radial positioning of the filter 7 is completed. Also, in this state, the filter 7 is coaxially fixed to the filter housing intermediate body 400 . Moreover, the large diameter portion 413 (unrestrained peripheral wall portion) of the peripheral wall portion 41 is arranged apart from the outer peripheral surface 74 of the filter 7 so that an annular gap 45 is formed between the large diameter portion 413 and the outer peripheral surface 74 of the filter 7 .
  • the peripheral wall of the filter housing intermediate body 400 is folded inward at a specified position P1 near the open end 401 .
  • the second constrained end 43 is formed as an annular flange, and the gas inlet 44 is formed inside the edge of the second constrained end 43 .
  • the folding position (P1) where the filter housing intermediate body 400 is folded inward is such that the inner surface 42A of the first restraint end portion 42 and the inner surface 43A of the second restraint end portion 43 are aligned with the first end surface 72 and the second end surface 72 of the filter 7. It is determined so as to abut on the end surface 73 respectively.
  • the filter 7 can be axially positioned by the first restraint end 42 and the second restraint end 43 .
  • the dimension from the folding position (P1) of the filter housing intermediate body 400 to the first restraint end 42 may be set to be slightly smaller than the axial length of the filter 7 .
  • the filter 7 can be axially compressed by the first constrained end 42 and the second constrained end 43 .
  • the filter unit preparation step the first end surface (one end surface in the axial direction) 72 of the filter 7 is restrained by arranging the first restraint end portion 42 as a closed surface at one end of the filter housing 40 , and the other end of the filter housing 40 is restrained.
  • the second end face (the other end face in the axial direction) 73 of the filter 7 is constrained by arranging the second constraining end portion 43 so as to surround the gas inlet 44 at .
  • the large diameter portion 413 (unrestrained peripheral wall portion) of the peripheral wall portion 41 of the filter housing 40 is separated from the outer peripheral surface 74 of the filter 7 so that an annular gap 45 is formed between the peripheral wall portion 41 and the filter housing 40 .
  • the outer peripheral surface 74 of the filter 7 is restrained by the small diameter portions 411 and 412 (restraining peripheral wall portions).
  • the filter housing intermediate body 400 without the small diameter portion 412 on the open end 401 side is prepared, and the small diameter portion 412 is formed after the filter 7 is inserted into the filter housing space.
  • a second restraining end 43 can also be formed.
  • step S02 of FIG. 3 a cylindrical combustion chamber housing unit is prepared in which the combustion chamber 22 containing the gas generating agent 62 is formed (combustion chamber housing unit preparation step).
  • the combustion chamber housing unit referred to here may be, for example, the combustion chamber housing unit 10 before the igniter 3 is attached.
  • the procedure shown in FIG. 3 is just an example, and the order of the filter unit preparation step and the combustion chamber housing filter unit preparation step is not particularly limited, and these orders may be changed as appropriate.
  • step S03 the filter unit 4 is assembled to the first end 2A (one end) of the combustion chamber housing 2 (assembling process).
  • FIG. 5 is a diagram for explaining the state of the assembly process.
  • the small diameter portion 412 of the filter housing 40 is inserted into the first end portion 2A of the combustion chamber housing 2 until the annular stepped portion 415 of the filter housing 40 in the filter unit 4 contacts the open end surface 2C of the combustion chamber housing 2 .
  • the filter housing 40 is fixed to the combustion chamber housing 2 in this state.
  • the fixation of the filter housing 40 to the combustion chamber housing 2 may be achieved by welding as described above, or may be achieved by press-fitting the small diameter portion 412 into the first end portion 2A via a seal member.
  • the gas generator 1 described in FIGS. 1 and 2 is completed, for example, by assembling the igniter 3 to the second end portion 2B of the combustion chamber housing 2 .
  • the method for manufacturing the gas generator 1 described above is merely an example, and each process may be replaced or another process may be added as necessary.
  • the combustion chamber housing unit preparation step the combustion chamber housing unit before attaching the igniter 3 is prepared, the filter unit 4 is assembled to the combustion chamber housing unit, and the igniter 3 is attached as a subsequent step.
  • the combustion chamber housing unit 10 with the igniter 3 assembled may be prepared, and the filter unit 4 may be assembled with the combustion chamber housing unit 10 in the assembly process.
  • the filter unit 4 is configured as a unit structure in which the filter 7 is coaxially positioned and fixed to the filter housing 40 and accommodated therein.
  • the filter 7 can be fixed to the filter housing 40 in a state in which the filter 7 is constrained from both the axial direction and the transverse direction (radial direction).
  • the filter 7 can be positioned and fixed in the filter housing 40 (filter housing space) without rattling.
  • the filter 7 does not come off from the filter housing 40, and is easy to handle as a part. Therefore, the filter unit 4 suitable for manufacturing the gas generator 1 can be provided. Moreover, since the filter 7 can be fixed inside the filter housing 40 without looseness, it is possible to suppress the generation of abnormal noise caused by vibrations from the outside.
  • the small-diameter portions 411 and 412 as restraining peripheral wall portions are arranged on both the first end 40A side and the second end 40B side. made it By doing so, it is possible to more stably position and fix the outer peripheral surface 74 of the filter 7 in the cross-sectional direction (radial direction).
  • the arrangement of the constraining peripheral wall portion in the filter housing 40 is not limited to this.
  • the small diameter portion 411 (412) may be arranged only on one of the first end 40A side and the second end 40B side of the peripheral wall portion 41, and the other portion of the peripheral wall portion 41 may be the large diameter portion 413.
  • the gas outlet 46 or the gas inlet 44 is provided. is preferably airtightly closed with a sealing member such as a sealing tape.
  • each gas discharge port 46 is closed with the sealing member.
  • closing the gas inlet 44 with a sealing member is advantageous in that it suffices to close only a single gas inlet 44 .
  • both gas outlets 46 open to the outside and gas outlets 46 maintained in a closed state may occur.
  • a movement suppressing member for suppressing the movement of the gas generating agent 62 from the combustion chamber 22 side into the filter housing 40 is preferably installed at the second restraint end 43 of the filter housing 40 .
  • a porous member having a large number of holes can be exemplified as such a movement suppressing member.
  • a sealing member e.g., seal tape
  • a gas generating agent 62 for blocking the gas inlet 44 of the filter unit 4 and a gas generating agent 62 are prevented from entering the filter housing 40 (filter housing space) from the combustion chamber 22 side. If both of the restraining porous members are attached to the second constraining end 43, the contact of the porous member with the sealing member may affect the opening pressure of the sealing member. Therefore, in such a case, it is preferable to dispose the sealing member and the porous member apart from each other.
  • FIG. 6 is a diagram illustrating an installation example of the sealing member and porous member installed in the second restraint end portion 43 of the filter housing 40.
  • the seal tape 8 as the sealing member is attached to the outer surface 43B of the second restraint end 43 inside the filter housing 40 .
  • an annular spacer 9A is attached to the outer surface 43B of the second restraint end portion 43, and the porous member 9B is attached to the spacer 9A.
  • the spacer 9A is interposed between the outer surface 43B of the second restraint end portion 43 and the porous member 9B to separate the porous member 9B and the seal tape 8 from each other and prevent them from coming into contact with each other. ing.
  • the porous member 9C has a spacer portion 9D attached to the outer surface 43B of the second restraining end portion 43 to space the porous member 9C and the sealing tape 8 from each other.
  • Gas generator 2 Combustion chamber housing 3: Ignitor 5: Partition wall 6: Gas generating agent 7: Filter 10: Combustion chamber housing unit 40: Filter housing 41: Peripheral wall 42: First restraint end 43: Second Restricted end 44: gas inlet 45: gap 46: gas outlet

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geometry (AREA)
  • Air Bags (AREA)
PCT/JP2022/024335 2021-11-12 2022-06-17 ガス発生器用フィルタユニット、ガス発生器、及びガス発生器の製造方法 Ceased WO2023084826A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22892329.8A EP4431346A4 (en) 2021-11-12 2022-06-17 FILTER ASSEMBLY FOR GAS GENERATOR, GAS GENERATOR AND METHOD FOR MANUFACTURING GAS GENERATOR
CN202280071869.8A CN118159452A (zh) 2021-11-12 2022-06-17 气体发生器用过滤器单元、气体发生器以及气体发生器的制造方法
US18/660,252 US12286073B2 (en) 2021-11-12 2024-05-10 Filter unit for gas generator, gas generator, and method for manufacturing gas generator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021185185A JP7808458B2 (ja) 2021-11-12 2021-11-12 ガス発生器用フィルタユニット、ガス発生器、及びガス発生器の製造方法
JP2021-185185 2021-11-12

Related Child Applications (1)

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US18/660,252 Continuation US12286073B2 (en) 2021-11-12 2024-05-10 Filter unit for gas generator, gas generator, and method for manufacturing gas generator

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WO2023084826A1 true WO2023084826A1 (ja) 2023-05-19

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Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2002046569A (ja) * 1999-02-16 2002-02-12 Daicel Chem Ind Ltd 多段式エアバッグ用ガス発生器及びエアバッグ装置
US6908104B2 (en) 2003-08-27 2005-06-21 Key Safety Systems, Inc. Pyrotechnic side impact inflator
JP2009286217A (ja) * 2008-05-28 2009-12-10 Nippon Kayaku Co Ltd ガス発生器
JP2012076608A (ja) * 2010-10-01 2012-04-19 Daicel Corp ガス発生器
WO2019049507A1 (ja) * 2017-09-05 2019-03-14 株式会社ダイセル ガス発生器

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DE4417347C2 (de) * 1994-05-18 1997-04-10 Temic Bayern Chem Airbag Gmbh Filtereinrichtung für Gasgeneratoren
JPH10315900A (ja) * 1997-05-15 1998-12-02 Daicel Chem Ind Ltd エアバッグ用ガス発生器及びエアバッグ装置
JP2001163171A (ja) * 1999-12-10 2001-06-19 Nippon Kayaku Co Ltd ガス発生器
CN101835166B (zh) * 2009-03-09 2012-12-12 上海贝尔股份有限公司 信道分配优化方法及信道分配优化设备
JP5770978B2 (ja) * 2010-04-19 2015-08-26 株式会社ダイセル ガス発生器
JP6619293B2 (ja) * 2016-05-23 2019-12-11 株式会社ダイセル ガス発生器
JP7553375B2 (ja) * 2021-02-04 2024-09-18 株式会社ダイセル 点火器組立体、及びガス発生器
DE112021007506T5 (de) * 2021-05-21 2024-04-04 Daicel Corporation Gasgenerator und Gasabgabeverfahren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002046569A (ja) * 1999-02-16 2002-02-12 Daicel Chem Ind Ltd 多段式エアバッグ用ガス発生器及びエアバッグ装置
US6908104B2 (en) 2003-08-27 2005-06-21 Key Safety Systems, Inc. Pyrotechnic side impact inflator
JP2009286217A (ja) * 2008-05-28 2009-12-10 Nippon Kayaku Co Ltd ガス発生器
JP2012076608A (ja) * 2010-10-01 2012-04-19 Daicel Corp ガス発生器
WO2019049507A1 (ja) * 2017-09-05 2019-03-14 株式会社ダイセル ガス発生器

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Title
See also references of EP4431346A4

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JP7808458B2 (ja) 2026-01-29
US12286073B2 (en) 2025-04-29
EP4431346A1 (en) 2024-09-18
JP2026026173A (ja) 2026-02-16
JP2023072553A (ja) 2023-05-24
US20240286575A1 (en) 2024-08-29
EP4431346A4 (en) 2025-09-03
CN118159452A (zh) 2024-06-07

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