WO2024062900A1 - ガス発生器 - Google Patents

ガス発生器 Download PDF

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Publication number
WO2024062900A1
WO2024062900A1 PCT/JP2023/031905 JP2023031905W WO2024062900A1 WO 2024062900 A1 WO2024062900 A1 WO 2024062900A1 JP 2023031905 W JP2023031905 W JP 2023031905W WO 2024062900 A1 WO2024062900 A1 WO 2024062900A1
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WO
WIPO (PCT)
Prior art keywords
gas
filling chamber
igniter
chamber
gas generator
Prior art date
Application number
PCT/JP2023/031905
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
信行 勝田
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 CN202380067345.6A priority Critical patent/CN119894730A/zh
Priority to DE112023003901.1T priority patent/DE112023003901T5/de
Publication of WO2024062900A1 publication Critical patent/WO2024062900A1/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
    • B60R21/268—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 release of stored pressurised gas
    • B60R21/272—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 release of stored pressurised gas with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators
    • 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
    • B60R21/268—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 release of stored pressurised gas
    • B60R21/274—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 release of stored pressurised gas characterised by means to rupture or open the fluid source
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26029—Ignitors

Definitions

  • the present disclosure relates to a gas generator.
  • gas generators are widely known in which a gas source is housed in a housing space formed within a housing, and the gas is discharged to the outside by activating an igniter.
  • This type of gas generator is used, for example, to supply gas to airbags and seatbelt retractors.
  • combustion gas water vapor, etc.
  • an airbag inflator that inflates an airbag by supplying the combustion gas to the airbag as an operating gas has been disclosed (for example, Patent Document 1).
  • a bottle containing an oxidizable gas and a bottle containing an oxidizing gas are connected to a common chamber, and a sealing foil that closes the outlet of each bottle is a squib.
  • a sealing foil that closes the outlet of each bottle is a squib.
  • the technology according to the present disclosure aims to simplify the structure of a gas generator that uses fuel gas and oxidizing gas.
  • the gas generator according to the present disclosure includes: an outer housing; ignition means including an igniter that releases combustion products when actuated; a first partition portion defining an ignition chamber in which the ignition means is accommodated and a gas filling chamber in which gas is filled inside the outer shell housing; a first communication portion provided in the first partition wall portion, closed before activation of the igniter, and opened by activation of the igniter to communicate the ignition chamber and the gas filling chamber; a discharge part provided in the outer shell housing, closed before the igniter is activated, and opened when the igniter is activated, thereby communicating the gas filling chamber with the outside of the outer shell housing; a second partition portion defining a first filling chamber adjacent to the first communication portion and a second filling chamber adjacent to the discharge portion inside the gas filling chamber; a fuel gas filled in one of the first filling chamber and the second filling chamber; an oxidizing gas filled in
  • the igniter and the first communication portion may be disposed opposite to each other.
  • the first communication section and the second communication section may be arranged to face each other.
  • the second communication part and the discharge part may be arranged to face each other.
  • the igniter, the first communication section, the second communication section, and the discharge section may be arranged on the same straight line.
  • the outer shell housing is formed into a bottomed cylindrical shape,
  • the igniter, the first communication portion, the second communication portion, and the exhaust portion may be disposed on a central axis of the outer shell housing.
  • the gas generator according to any one of aspects 1 to 6 above includes a cylinder whose one end is joined to the outer shell housing so as to form therein a diffusion chamber that communicates with the gas filling chamber through the discharge part. It further includes a shaped diffuser housing, A gas discharge hole may be formed in a peripheral wall portion of the diffuser housing to communicate the diffusion chamber with the outside of the gas generator.
  • the fuel gas may be filled in one of the first filling chamber and the second filling chamber together with an inert gas.
  • the fuel gas may be hydrogen gas.
  • the wall surface of the one filled with the hydrogen gas between the first filling chamber and the second filling chamber may be coated with a hydrogen embrittlement film.
  • the oxidizing gas may be filled in the other of the first filling chamber and the second filling chamber together with an inert gas.
  • the second communication part is formed as a part of the second partition part so as to be ruptured by activation of the igniter, and the second communication part is formed as a part of the second partition part so as to be opened to the side of the second filling chamber. It may protrude in a dome shape.
  • the second communication portion may be formed thinner than other portions of the second partition wall portion.
  • the second communicating portion may have a linear weakened portion formed thinner than other portions of the second communicating portion.
  • the ignition means may include a gas generating agent that is disposed in the ignition chamber and is combusted by operation of the igniter.
  • the first communication section is configured to connect to an opening formed in the first partition wall, and closes the opening before the igniter is activated. and a rupture disc that ruptures.
  • the discharge part is configured to close the opening formed in the outer shell housing and close the opening before the igniter is activated, and is split open by the igniter activation. It may be formed by a rupture disc.
  • the outer shell housing is formed in a cylindrical shape with a bottom
  • the first filling chamber includes a first axial region adjacent to the ignition chamber in the axial direction of the outer shell housing with the first partition wall in between, and a radial region of the outer shell housing with the first partition wall in between. a cylindrical first radial region surrounding the ignition chamber from the direction;
  • the second filling chamber includes a second axial region adjacent to the first axial region of the first filling chamber in the axial direction of the outer shell housing with the second partition wall in between, and the second partition wall portion. and a cylindrical second radial region surrounding the first radial region of the first filling chamber from the radial direction of the outer shell housing.
  • the gas generator according to any one of aspects 1 to 18 above includes a cylinder whose one end is joined to the outer shell housing so as to form a diffusion chamber therein that is communicated with the gas filling chamber through the discharge part. It further includes a shaped diffuser housing, A gas exhaust hole is formed in the peripheral wall of the diffuser housing, and the gas exhaust hole communicates the diffusion chamber with the outside of the gas generator.
  • the diffusion chamber is adjacent to the gas filling chamber in the axial direction of the outer shell housing with a wall of the outer shell housing in between,
  • the gas generator housing configured by the outer shell housing and the diffuser housing may have a length in the axial direction that is shorter than a width in the radial direction.
  • the structure of a gas generator using fuel gas and oxidizing gas can be simplified.
  • FIG. 1 is a sectional view showing a state before operation of the gas generator according to the embodiment.
  • FIG. 2 is a diagram for explaining the second communication section according to the embodiment.
  • FIG. 3 is a diagram for explaining a modification of the second communication section.
  • FIG. 4 is a cross-sectional view showing the operating state of the gas generator according to the embodiment.
  • FIG. 1 is a cross-sectional view showing a state of a gas generator 100 according to an embodiment before operation.
  • the gas generator 100 is an inflator for an airbag, and is a device that supplies an operating gas to the airbag to inflate the airbag (not shown) when the airbag is operated.
  • the gas generator 100 generates water vapor, which is a combustion gas, by igniting a mixed gas of hydrogen gas, which is an example of a fuel gas, and oxygen gas, which is an example of an oxidizing gas, and uses the water vapor to operate an airbag.
  • the gas is configured to be supplied to the airbag as a gas (hereinafter referred to as actuation gas).
  • the gas generator 100 includes an upper shell 1, a lower shell 2, an intermediate shell 3, an ignition means 20, a holding member 5, a first rupture disc 6, a second rupture disc 7, a diffuser housing 8, and It is provided with a filter 9 and is formed into a bottomed cylindrical shape with both ends closed.
  • the upper shell 1, a portion of the lower shell 2, and a portion of the intermediate shell 3 form an outer housing 10 shown in a dot pattern in FIG. 1.
  • the outer shell housing 10 is formed into a bottomed cylindrical shape with both ends closed.
  • Reference numeral A1 in FIG. 1 indicates the central axis of the outer shell housing 10.
  • the direction along the axial direction of the outer shell housing 10 is defined as the vertical direction of the gas generator 100, the lower shell 2 side (i.e., the lower side in FIG. 1) is the lower side of the gas generator 100, and the opposite side (That is, the upper side of the upper shell 1 in FIG. 1) is the upper side of the gas generator 100.
  • axial direction refers to the axial direction of the outer shell housing 10
  • radial direction refers to the radial direction of the outer shell housing 10
  • circumferential direction refers to the radial direction of the outer shell housing 10.
  • Direction refers to the circumferential direction of the outer shell housing 10.
  • the upper shell 1 has an upper outer peripheral wall portion 11, a top plate portion 12, an upper inner peripheral wall portion 13, and a flange portion 15, and is formed in a bottomed cylindrical shape with a closed upper end.
  • the upper outer peripheral wall portion 11 is formed in a cylindrical shape extending vertically.
  • the top plate portion 12 extends radially inward from the upper end of the upper outer peripheral wall portion 11.
  • the upper inner peripheral wall portion 13 is formed in a cylindrical shape extending (protruding) downward from the radially inner edge portion of the top plate portion 12.
  • An opening 14 is formed at the lower end of the upper inner peripheral wall portion 13.
  • the flange portion 15 extends radially outward from the lower end of the upper outer peripheral wall portion 11.
  • the lower shell 2 has a lower outer peripheral wall portion 21, a bottom plate portion 22, and a lower inner peripheral wall portion 23, and is formed into a bottomed cylindrical shape with a closed lower end.
  • the lower outer peripheral wall portion 21 is formed into a cylindrical shape extending vertically.
  • the bottom plate portion 22 extends radially inward from the lower end of the lower outer peripheral wall portion 21.
  • the lower inner peripheral wall portion 23 is formed into a cylindrical shape extending (protruding) upward from the radially inner edge of the bottom plate portion 22.
  • An opening 24 is formed at the upper end of the lower inner peripheral wall portion 23.
  • the intermediate shell 3 has an intermediate outer circumferential wall portion 31, an intermediate plate portion 32, an intermediate inner circumferential wall portion 33, and a lid wall portion 34, and is formed into a bottomed cylindrical shape with a closed lower end.
  • the intermediate outer circumferential wall portion 31 is formed into a cylindrical shape that extends vertically.
  • the intermediate plate portion 32 extends radially inward from the lower end of the intermediate outer circumferential wall portion 31 .
  • the intermediate inner circumferential wall portion 33 is formed in a cylindrical shape that extends (projects) upward from the radially inner edge of the intermediate plate portion 32 .
  • the lid wall 34 closes off the upper end of the intermediate inner circumferential wall 33 .
  • the intermediate plate portion 32 is arranged coaxially with the central axis A1 of the outer shell housing 10.
  • the upper shell 1, the lower shell 2, and the intermediate shell 3 are made of metal materials.
  • the metal materials from which they are made are not particularly limited, but examples include iron and stainless steel.
  • the upper shell 1 is disposed on the upper side
  • the lower shell 2 is disposed on the lower side
  • the intermediate shell 3 is disposed between the upper shell 1 and the lower shell 2.
  • the lower inner peripheral wall portion 23 of the lower shell 2 is inserted into the intermediate inner peripheral wall portion 33 of the intermediate shell 3, and in this state, the flange portion 15 of the upper shell 1 and the intermediate outer peripheral wall portion 31 of the intermediate shell 3 are joined, and the intermediate plate portion 32 of the intermediate shell 3 and the lower outer peripheral wall portion 21 of the lower shell 2 are joined.
  • laser welding can be used to join the various members.
  • the first rupture disc 6 is a plate-shaped member that covers the opening 24 of the lower shell 2 to close the opening 24, and is configured to be ruptured by energy generated by activation of the igniter 4.
  • the first rupture disc 6 is made of a metal material.
  • the metal material forming the first rupture disc 6 is not particularly limited, and examples thereof include iron and stainless steel.
  • the first rupture disc 6 is fixed to the lower inner peripheral wall portion 23 by joining a peripheral portion thereof to an upper end portion of the lower inner peripheral wall portion 23 by laser welding or the like.
  • the second rupture disc 7 is a plate-shaped member that covers the opening 14 of the upper shell 1 to close the opening 14, and is configured to rupture due to the energy generated by the operation of the igniter 4.
  • the second rupture disc 7, like the first rupture disc 6, is made of a metal material such as iron or stainless steel.
  • the second rupture disc 7 is fixed to the upper inner peripheral wall 13 by joining its peripheral edge to the lower end of the upper inner peripheral wall 13 by laser welding or the like.
  • the outer shell housing 10 is formed by the lower outer circumferential wall part 21 and the bottom plate part 22 of the upper shell 1 and the lower shell 2, the intermediate outer circumferential wall part 31 of the intermediate shell 3, and a part of the intermediate plate part 32. More specifically, a portion of the intermediate plate portion 32 that is radially outer than the joint portion with the lower outer circumferential wall portion 21 of the lower shell 2 constitutes a part of the outer shell housing 10 .
  • the first partition wall portion 30 is formed by a portion of the lower inner peripheral wall portion 23 of the lower shell 2 .
  • the first partition wall portion 30 defines an ignition chamber S10 in which the ignition means 20 is housed and a gas filling chamber S20 in which gas is filled inside the outer shell housing 10.
  • the ignition chamber S10 is a space surrounded by the first partition part 30 in the internal space of the outer shell housing 10, and is maintained at atmospheric pressure by closing a first communication part 40, which will be described later.
  • the gas filling chamber S20 is a space outside the first partition part 30 in the internal space of the outer shell housing 10, and is in a pressurized state by being filled with pressurized gas.
  • the ignition means 20 includes an igniter 4 housed in an ignition chamber S10.
  • the igniter 4 includes an ignition section 41 containing an ignition charge, and a conductive section 42 to which an ignition current for igniting the ignition charge is supplied.
  • the igniter 4 is configured so that when activated by the ignition current supplied to the conductive part 42, the ignition part 41 ruptures and combustion products (flame, etc.) of the igniter are released.
  • Reference numeral 411 in FIG. 1 indicates a discharge part that ruptures to release combustion products when the igniter 4 is activated.
  • the emission part 411 faces upward.
  • the igniter used in the igniter 4 is not limited, but includes gunpowder containing zirconium and potassium perchlorate (ZPP), gunpowder containing titanium hydride and potassium perchlorate (THPP), and gunpowder containing titanium and potassium perchlorate.
  • ZPP zirconium and potassium perchlorate
  • THPP titanium hydride and potassium perchlorate
  • TiPP gunpowder containing titanium and potassium perchlorate
  • APP gunpowder containing aluminum and potassium perchlorate
  • ABO explosives containing aluminum and bismuth oxide
  • AMO explosives containing aluminum and molybdenum oxide
  • ACO explosives containing aluminum and copper oxide
  • Explosive powder containing aluminum and iron oxide (AFO) or a combination of a plurality of these explosives is exemplified.
  • the ignition means 20 may further include a solid gas generating agent depending on the energy required to open the communication portion and the discharge portion described below.
  • the gas generating agent is contained in the ignition chamber S10, and generates gas by burning with the combustion products released from the igniter 4 when the igniter 4 is activated.
  • the gas generating agent may also be disposed adjacent to the ignition charge inside the ignition portion 41.
  • the gas generating agent may be, for example, a single-hole cylindrical agent made of guanidine nitrate (41% by weight), basic copper nitrate (49% by weight), binders and additives. The gas generating agent is not limited to this.
  • the "energy generated by the operation of the igniter” in this example includes the energy released from the igniter 4 (shock waves, flames, high-temperature gas, etc. due to the release of combustion products) and the energy caused by the combustion of the igniter (pressure increase, etc.).
  • the ignition means 20 includes a gas generating agent
  • energy (pressure increase, etc.) due to combustion of the gas generating agent caused by the operation of the igniter 4 is also included in "energy generated by the operation of the igniter.” That is, in this specification, "energy generated by the operation of the igniter” refers to energy primarily or secondarily generated by the operation of the igniter.
  • the holding member 5 is a member made of resin that is disposed between the igniter 4 and the lower inner peripheral wall portion 23 of the lower shell 2 and joins the igniter 4 and the lower inner peripheral wall portion 23 together. An annular gap formed between the igniter 4 and the lower inner peripheral wall portion 23 is filled with the holding member 5 . Thereby, the internal space of the ignition chamber S10 is sealed.
  • the holding member 5 is configured such that the discharge portion 411 of the igniter 4 is exposed from the holding member 5 to the ignition chamber S10, and the tip of the conductive portion 42 is exposed from the holding member 5 to the external space of the outer shell housing 10. It covers 4.
  • the holding member 5 is attached to the inner circumferential surface of the lower inner circumferential wall portion 23 such that a connector insertion space 51, which is a space into which a power supply connector (not shown) can be inserted, is formed inside the lower inner circumferential wall portion 23. is covered.
  • the first partition part 30 is closed before the igniter 4 is activated, and is opened when the igniter 4 is activated to connect the ignition chamber S10 and the gas filling chamber S20 (more specifically, the first filling chamber S1).
  • a first communication section 40 configured to communicate is provided.
  • the first communication section 40 is formed by an opening 24 formed in the first partition wall 30 and a first rupture disc 6 that closes the opening 24.
  • the opening 24 is closed by the first rupture disc 6, and when the igniter 4 is activated, the first rupture disc 6 ruptures due to the energy generated by the activation of the igniter 4.
  • the communication portion 40 opens, and the ignition chamber S10 and the gas filling chamber S20 communicate with each other.
  • the first communication portion 40 is closed, so the ignition chamber S10 is maintained at atmospheric pressure, and the igniter 4 is prevented from being exposed to pressurized gas. .
  • the discharge portion 411 of the igniter 4 and the first communication portion 40 are arranged to face each other. Therefore, when the igniter 4 is activated, energy (shock waves, flame, high-temperature gas, etc.) is released from the igniter 4 toward the first rupture disc 6, making the first rupture disc 6 easy to rupture. .
  • the outer shell housing 10 is closed before the igniter 4 is activated, and is opened when the igniter 4 is activated to open the gas filling chamber S20 (more specifically, the second filling chamber S2) and the outside of the outer housing 10. (More specifically, a discharge section 50 configured to communicate with the diffusion chamber S30) is provided.
  • the discharge section 50 is formed by an opening 14 formed in the outer shell housing 10 and a second rupture disc 7 that closes the opening 14. Before the igniter 4 is activated, the opening 14 is closed by the second rupture disc 7, and when the igniter 4 is activated, the second rupture disc 7 ruptures due to the energy generated by the activation of the igniter 4. 50 is opened, and the gas filling chamber S20 and the outside of the outer shell housing 10 communicate with each other.
  • the gas filling chamber S20 is partitioned by a second partition 60.
  • the second partition wall portion 60 is formed by a part of the intermediate plate portion 32 of the intermediate shell 3, the intermediate inner peripheral wall portion 33, and the lid wall portion 34. More specifically, a portion of the intermediate plate portion 32 that is radially inner than the joint portion with the lower outer circumferential wall portion 21 of the lower shell 2 constitutes a part of the second partition wall portion 60 .
  • a first filling chamber S1 adjacent to the first communication section 40 and a second filling chamber S2 adjacent to the discharge section 50 are defined inside the gas filling chamber S20 by the second partition wall section 60.
  • the first filling chamber S1 is a space surrounded by the second partition part 60 in the gas filling chamber S20, and is defined by the lower shell 2 and the intermediate shell 3.
  • the second filling chamber S2 is a space outside the second partition part 60 in the gas filling chamber S20, and is defined by the upper shell 1 and the intermediate shell 3.
  • the second partition portion 60 includes a second partition wall configured to be closed before the igniter 4 is activated and to open when the igniter 4 is activated to communicate the first filling chamber S1 and the second filling chamber S2.
  • Two communication portions 70 are provided.
  • the second communication portion 70 is formed as a part of the second partition portion 60 so as to be split when the igniter 4 is activated. More specifically, the second communication portion 70 is formed by the center portion of the lid wall portion 34 that constitutes the second partition wall portion 60, and protrudes in a dome shape toward the second filling chamber S2.
  • the central portion of the lid wall 34 receives the energy generated by the activation of the igniter 4.
  • the second communication portion 70 opens, and the first filling chamber S1 and the second filling chamber S2 communicate with each other.
  • the first communication section 40 and the second communication section 70 are arranged to face each other. Therefore, when the igniter 4 is activated, energy (shock waves, high-temperature gas, etc.) is released from the opened first communication part 40 toward the second communication part 70, and the second communication part 70 becomes easy to rupture. ing.
  • the second communication portion 70 protrudes toward the second filling chamber S2.
  • the second communicating portion 70 protrudes to the outside of the first filling chamber S1. Therefore, the second communication portion 70 has lower strength against energy from the first filling chamber S1 side than from the second filling chamber S2 side. This also makes it easy for the second communicating portion 70 to rupture when the igniter 4 is activated.
  • the second communication portion 70 being formed in a dome shape.
  • one of the first filling chamber S1 and the second filling chamber S2 is filled with pressurized gas, and then the other is filled with pressurized gas.
  • the second communication portion 70 is deformed into a convex shape toward the other filling chamber due to the pressure of the pressurized gas that was first filled into one filling chamber, and the pressurized gas that was then filled into the other filling chamber. If the second communication portion 70 is pushed back by the pressure and deformed into a convex shape toward one filling chamber, and the uneven deformation is repeated, this is not preferable from the viewpoint of strength against pressurized gas.
  • the second communication portion 70 is difficult to deform. Therefore, if the first filling chamber S1 is filled with pressurized gas first, even if the second filling chamber S2 is first filled with pressurized gas, the second communication portion 70 is filled with the first filling chamber S1. Convex deformation toward the chamber S1 side is suppressed. That is, at least convex deformation toward the first filling chamber S1 side is suppressed. Therefore, by forming the second communicating portion 70 in a dome shape, the second communicating portion 70 is prevented from repeatedly deforming into uneven shapes when being filled with pressurized gas.
  • the second communicating portion 70 is formed thinner than other portions of the second partition portion 60 (that is, portions of the second partition portion 60 excluding the second communicating portion 70). Therefore, the second communication section 70 is more fragile than other parts of the second partition wall section 60. This also makes it easy for the second communicating portion 70 to rupture when the igniter 4 is activated.
  • FIG. 2 is a diagram for explaining the second communication section 70 according to the embodiment.
  • the upper end surface of the lid wall portion 34 of the intermediate shell 3 is illustrated.
  • a plurality of linearly extending V-shaped grooves G1 (triangular in cross section) are formed in the second communication portion 70.
  • the plurality of grooves G1 extend radially in the radial direction starting from the center portion, which is the top portion of the lid wall portion 34 .
  • eight grooves G1 are formed at equal angular intervals.
  • the shape of the groove G1 is not limited to the V-shape, and may have a rectangular cross section or a semicircular cross section.
  • the portion of the second communication portion 70 where the groove G1 is formed is a linear weakened portion 701 formed thinner than other portions of the second communication portion 70 .
  • the fragile portion 701 is more fragile than other parts (that is, the parts of the second communication part 70 excluding the fragile part 701), and is easily broken.
  • the second communication portion 70 has a linear fragile portion 701 that is preferentially easy to rupture, so that it is easy to rupture when the igniter 4 is activated, while ensuring strength against pressurized gas.
  • a plurality of weakened portions 701 are formed, and all of the weakened portions 701 intersect at the center of the second communication portion 70 .
  • FIG. 3 is a diagram for explaining a modification of the second communication section 70. As shown in FIG. 3, in the second communication portion 70 according to the modified example, the weakened portion 701 does not intersect at the center thereof. In other words, the fragile portion 701 is formed in the second communication portion 70 except for the center portion (top portion). Although the second communicating portion 70 shown in FIGS.
  • the weakened portion 701 in this example is formed in the shape of a continuous solid line, the weakened portion 701 may be formed in the shape of a broken line or dotted line that extends intermittently.
  • the second communication section 70 and the discharge section 50 are arranged to face each other. Therefore, when the igniter 4 is activated, energy (shock waves, high-temperature gas, etc.) is released from the opened second communication portion 70 toward the second rupture disc 7, and the second rupture disc 7 becomes easy to rupture. ing.
  • the first filling chamber S1 has a first axial region S11 and a first radial region S12.
  • the first axial region S11 is adjacent to the ignition chamber S10 in the axial direction across the first partition wall 30, and is disposed above the ignition chamber S10.
  • the first axial region S11 is sandwiched in the axial direction between the first communication portion 40 and the second communication portion 70.
  • the first radial region S12 is formed in a cylindrical shape so as to radially surround the ignition chamber S10 across the first partition wall 30, and is disposed radially outside the ignition chamber S10.
  • the second filling chamber S2 has a second axial region S21 and a second radial region S22.
  • the second axial region S21 is adjacent to the first axial region S11 of the first filling chamber S1 in the axial direction with the second partition wall 60 in between, and is arranged above the first axial region S11. .
  • the second axial region S21 is sandwiched between the second communication section 70 and the discharge section 50 in the axial direction.
  • the second radial region S22 is formed in a cylindrical shape so as to radially surround the first radial region S12 of the first filling chamber S1 with the second partition wall 60 in between. located radially outward.
  • the second filling chamber S2 is filled with hydrogen as a fuel gas in a compressed state.
  • the fuel gas according to the present disclosure is not limited to hydrogen gas.
  • the fuel gas is not particularly limited, examples thereof include flammable gases such as simple gases such as hydrogen, methane, ethane, propane, and butane, and mixed gases containing at least one type of gas among these gases.
  • the first filling chamber S1 is filled with oxygen gas in a compressed state as an oxidizing gas.
  • the oxidizing gas according to the present disclosure is not limited to oxygen gas.
  • the oxidizing gas is not particularly limited, but examples include simple gases such as oxygen and nitrous oxide, and mixed gases such as air, which are combustion-supporting gases.
  • the first filling chamber may be filled with fuel gas
  • the second filling chamber may be filled with oxidizing gas. That is, in the gas generator according to the present disclosure, one of the first filling chamber and the second filling chamber may be filled with fuel gas, and the other may be filled with oxidizing gas. Moreover, the gas filled in the filling chamber does not need to be in a pressurized state.
  • Fuel gas may be filled into one of the first and second filling chambers together with an inert gas.
  • Oxidizing gas may be filled into the other of the first and second filling chambers together with an inert gas. That is, in this example, the second filling chamber S2 may be filled with hydrogen gas and an inert gas, and the first filling chamber S1 may be filled with oxygen gas and an inert gas.
  • the pressurized state of the filling chamber may be formed by an inert gas.
  • the inert gas is not particularly limited, but examples include low-reactivity gases such as nitrogen, argon, helium, and carbon dioxide.
  • the wall surface of the second filling chamber S2 filled with hydrogen gas is made of a material having hydrogen barrier properties in order to prevent hydrogen embrittlement due to contact of the metal surface constituting the wall surface with hydrogen.
  • a hydrogen embrittlement resistant film C1 is coated.
  • the hydrogen embrittlement film C1 is provided on the surfaces of the upper shell 1 and the middle shell 3 that define the second filling chamber S2.
  • This hydrogen embrittlement film C1 may be configured to be capable of suppressing hydrogen from penetrating into the metal surface.
  • the material of the hydrogen embrittlement film C1 is not limited as long as it has hydrogen barrier properties, and may be a resin material, a metal material, or a ceramic material.
  • Examples of resin materials forming the hydrogen embrittlement film C1 include ethylene vinyl alcohol copolymer resin and polyamide 6, examples of metal materials include A6061-T6 aluminum alloy, and examples of ceramic materials include aluminum oxide and Examples include titanium oxide.
  • Specific examples of the structure of the hydrogen embrittlement film C1 include the Al-5Mg thermal spray coating described in JP-A No. 2018-141214 and the relatively high hydrogen cut rate described in Table 1 of JP-A No. 2021-139034. Examples include coatings, ceramic thin films described in JP-A-2007-9276, and the like.
  • the hydrogen-resistant brittle film C1 is coated on the wall surface of the second filling chamber S2, but when the first filling chamber S1 is filled with hydrogen gas, the hydrogen-resistant brittle film C1 is coated with the hydrogen-resistant brittle film C1. 1
  • the wall surface of the filling chamber S1 is coated.
  • the hydrogen embrittlement film C1 may be coated on the wall surface of the one of the first filling chamber S1 and the second filling chamber S2 that is filled with hydrogen gas.
  • the hydrogen embrittlement film is not an essential component.
  • the diffuser housing 8 is formed into a bottomed cylindrical shape that extends vertically and is closed at the upper end. More specifically, the diffuser housing 8 has a cylindrical peripheral wall part 81 that extends vertically, and a lid wall part 82 that closes the upper end of the peripheral wall part 81. A lower end portion of the peripheral wall portion 81 (corresponding to one end portion of the diffuser housing according to the present disclosure) is joined to the outer shell housing 10 such that the discharge portion 50 of the outer shell housing 10 is located inside the peripheral wall portion 81. . Thereby, a diffusion chamber S30 is formed inside the diffuser housing 8, which communicates with the gas filling chamber S20 via the discharge part 50.
  • a plurality of gas exhaust holes 83 are formed in the peripheral wall portion 81 of the diffuser housing 8 to communicate the diffusion chamber S30 with the outside of the gas generator 100.
  • the igniter 4 When the igniter 4 is activated, the operating gas from the gas filling chamber S20 passes through the diffusion chamber S30 and is discharged to the outside through the gas discharge hole 83.
  • the number of gas exhaust holes 83 is not particularly limited, and may not be plural.
  • the filter 9 is a cylindrical member that extends vertically and is open at both ends, and has an upper end supported by the lid wall 82 of the diffuser housing 8 and a lower end supported by the top plate 12 of the upper shell 1. In this state, it is disposed between the exhaust section 50 and the gas exhaust hole 83 inside the diffusion chamber S30.
  • the filter 9 is formed with pores so that the working gas can be filtered and cooled.
  • the igniter 4, the first communication section 40, the second communication section 70, and the discharge section 50 are arranged on the same straight line.
  • the phrase "a plurality of members are arranged on the same straight line” means that a straight line passing through the plurality of members may exist.
  • the central axis A1 of the outer shell housing 10 passes through the igniter 4, the first communication section 40, the second communication section 70, and the discharge section 50 as the same straight line. That is, the igniter 4, the first communication section 40, the second communication section 70, and the discharge section 50 are arranged on the central axis A1.
  • the fact that the igniter 4, the first communication part 40, the second communication part 70, and the discharge part 50 are arranged on the same straight line means that the combustion products are discharged from the discharge part 411 of the igniter 4 (main direction).
  • the path from the igniter 4 to the diffusion chamber S30 is linear, the combustion products released from the igniter 4 can easily reach the diffusion chamber S30, and the mixed gas in the diffusion chamber S30 can be ignited. becomes easier.
  • the igniter 4, the first communication section 40, the second communication section 70, and the discharge section 50 are arranged close to each other in the axial direction (vertical direction). It is now easier to open everything.
  • the gas generator 100 By arranging the igniter 4, the first communication section 40, the second communication section 70, and the discharge section 50 on the central axis A1 of the outer shell housing 10, the gas generator 100 An axially symmetrical structure can be adopted. This facilitates manufacturing of the gas generator 100. Further, by making the gas generator 100 have an axially symmetrical structure, uneven output of the gas generator in the circumferential direction can be suppressed.
  • FIG. 4 is a cross-sectional view showing the operating state of the gas generator 100 according to the embodiment.
  • FIG. 4 shows a cross section of the outer shell housing 10 along the axial direction.
  • the discharge part 411 ruptures and the combustion products of the ignition powder are released into the ignition chamber S10.
  • the combustion products are discharged upward (in the axial direction).
  • the first communicating part 40 is disposed above the igniter 4 and facing the discharge part 411 of the igniter 4, as shown in FIG. It cleaves when it receives energy (shock waves, flame, high temperature gas, etc.) released from the material. As a result, the first communicating portion 40 opens.
  • the second communication section 70 since the second communication section 70 is disposed above the first communication section 40 and facing the first communication section 40, the second communication section 70 receives energy released from the open first communication section 40. cleavage. As a result, the second communicating portion 70 opens. Furthermore, since the discharge part 50 is disposed above the second communication part 70 and facing the second communication part 70, the second rupture disc 7 of the discharge part 50 absorbs the energy released from the opened second communication part 70. It cleaves in response to As a result, the discharge section 50 opens. In this way, since the igniter 4, the first communication section 40, the second communication section 70, and the discharge section 50 are arranged on the same straight line, they open together due to the energy released from the igniter 4.
  • oxygen gas oxygen gas (oxidizing gas) is filled in the first filling chamber S1. and the hydrogen gas (fuel gas) filled in the second filling chamber S2 can be mixed.
  • the oxygen gas flows into the diffusion chamber S30 through the second communication section 70 and the discharge section 50, and is diffused.
  • Hydrogen gas flows into the diffusion chamber S30 through the discharge part 50 and diffuses therein. Thereby, oxygen gas and hydrogen gas are mixed in the diffusion chamber S30.
  • the combustion products released from the igniter 4 flow into the diffusion chamber S30 through the first communication section 40, the second communication section 70, and the discharge section 50, so that a mixture of hydrogen gas and oxygen gas is generated. is ignited and burns. As a result, water vapor, which is the operating gas for the airbag, is generated.
  • the working gas generated in the diffusion chamber S30 passes through the filter 9 and is discharged to the outside of the gas generator 100 from the gas discharge hole 83. While the working gas passes through the filter 9, the filter 9 captures fragments of the first rupture disc 6, the second rupture disc 7, and the lid wall 34 contained in the gas. Furthermore, when the working gas passes through the filter 9, it is cooled and filtered by the filter 9. Since the gas discharge hole 83 is formed in the peripheral wall portion 81 of the diffuser housing 8, the working gas is discharged radially outward. Therefore, the flow of gas from the gas filling chamber S20 to the diffusion chamber S30 in the axial direction changes to the radial direction by the diffuser housing 8.
  • the operating gas discharged from the gas generator 100 is supplied to the airbag, thereby inflating the airbag and protecting the occupants of the vehicle from impact.
  • the gas generator 100 an outer shell housing 10; ignition means 20 including an igniter 4 that releases combustion products when activated; a first partition part 30 that defines an ignition chamber S10 in which the ignition means 20 is accommodated and a gas filling chamber S20 in which gas is filled inside the outer shell housing 10; A first communication part 40 that is provided in the first partition wall part 30, is closed before the igniter 4 is activated, and opens when the igniter 4 is activated, thereby communicating the ignition chamber S10 and the gas filling chamber S20; a discharge part 50 that is provided in the outer shell housing 10, is closed before the igniter 4 is activated, and is opened when the igniter 4 is operated, thereby communicating the gas filling chamber S20 with the outside of the outer shell housing 10; a second partition part 60 that defines a first filling chamber S1 adjacent to the first communication part 40 and a second filling chamber S2 adjacent to the discharge part 50 inside the gas filling chamber S20; Hydrogen gas as a fuel gas filled in one of
  • the gas generator 100 employs a structure in which the fuel gas and the oxidizing gas are mixed by opening the second communication portion 70 provided in the second partition portion 60 that separates the first filling chamber S1 and the second filling chamber S2 by the operation of the igniter 4.
  • the igniter 4 and the first communication portion 40 are arranged to face each other. Therefore, when the igniter 4 is activated, energy can be released from the igniter 4 toward the first communication section 40, and the first communication section 40 can be opened easily.
  • the first communication section 40 and the second communication section 70 are arranged to face each other. Therefore, when the igniter 4 is activated, energy can be released from the opened first communication part 40 toward the second communication part 70, and the second communication part 70 can be made easier to open.
  • the second communication section 70 and the discharge section 50 are arranged to face each other. Therefore, when the igniter 4 is activated, energy can be released from the opened second communication section 70 toward the discharge section 50, making it easier to open the discharge section 50.
  • the igniter 4, the first communication section 40, the second communication section 70, and the discharge section 50 are arranged on the same straight line. Therefore, when the igniter 4 is activated, the energy released from the igniter 4 makes it easy to open the first communication section 40, the second communication section 70, and the discharge section 50 all at once.
  • the outer shell housing 10 is formed in a cylindrical shape with a bottom, and the igniter 4, the first communication part 40, the second communication part 70, and the discharge part 50 are connected to the outer shell housing 10. It is arranged on the central axis A1.
  • the gas generator 100 can have an axially symmetrical structure with respect to the central axis A1, which facilitates manufacturing of the gas generator 100 and suppresses uneven output of the gas generator 100 in the circumferential direction. be able to.
  • the arrangement of the igniter, the first communication part, the second communication part, and the discharge part is not limited to the above-mentioned embodiment, and may not be arranged in a straight line.
  • the gas generator 100 has a cylindrical shape with one end joined to the outer shell housing 10 so as to form therein a diffusion chamber S30 that communicates with the gas filling chamber S20 via the discharge part 50.
  • the gas generator 100 further includes a diffuser housing 8, and a gas discharge hole 83 is formed in a peripheral wall portion 81 of the diffuser housing 8 to communicate the diffusion chamber S30 with the outside of the gas generator 100.
  • the fuel gas and the oxidizing gas can be mixed and ignited in the diffusion chamber S30.
  • the gas exhaust hole 83 is formed in the peripheral wall portion 81 of the diffuser housing 8, the flow of gas can be changed from the axial direction to the radial direction.
  • the diffuser housing 8 is not an essential component in the gas generator according to the present disclosure.
  • the gas generator according to the present disclosure may have a configuration in which gases are mixed in the filling chamber and ignited.
  • the fuel gas filled in the gas generator 100 is hydrogen gas
  • the one filled with hydrogen gas in this example, the first filling chamber S1 and the second filling chamber S2 is filled with hydrogen gas.
  • the wall surface of the second filling chamber S2) is coated with a hydrogen-resistant brittle film C1. According to this, it is possible to prevent hydrogen embrittlement due to contact of the metal surface constituting the wall surface of the second filling chamber S2 with hydrogen.
  • the second communication portion 70 is formed as a part of the second partition wall portion 60 so as to be split when the igniter 4 is operated, and protrudes in a dome shape toward the second filling chamber S2. ing. According to this, since the convex deformation toward at least the first filling chamber S1 side is suppressed, the second communication portion 70 is prevented from repeatedly deforming into the concave and convex shape during filling with pressurized gas. As a result, the strength of the second communicating portion 70 against pressurized gas can be improved.
  • the second communication portion 70 according to the present embodiment is formed thinner than other portions of the second partition wall portion 60. This makes it easy for the second communication portion 70 to rupture when the igniter 4 is activated.
  • the second communicating portion 70 has a linear weak portion 701 that is thinner than other portions of the second communicating portion 70 . This makes it easier for the second communication portion 70 to rupture when the igniter 4 is activated.
  • the second communication part of the gas generator according to the present disclosure does not need to be a part of the second partition part.
  • the second communicating portion may be formed by an opening formed in the second partition and a rupture disc that closes the opening before the igniter is activated and ruptures when the igniter is activated.
  • the first communication portion 40 closes the opening 24 formed in the first partition portion 30 and the opening 24 before the igniter 4 is activated, and ruptures when the igniter 4 is activated.
  • the first rupture disc 6 is formed by the first rupture disc 6.
  • the first communication portion 40 can be opened by operating the igniter 4.
  • the first communication part according to the present disclosure is not limited to the above-described embodiment, and may be formed as a part of the first partition part so as to be split by the operation of the igniter, for example.
  • the discharge part 50 includes an opening 14 formed in the outer shell housing 10 and a second bursting part that closes the opening 14 before the igniter 4 is activated and ruptures when the igniter 4 is activated. It is formed by plate 7. Thereby, the discharge part 50 can be opened by actuation of the igniter 4.
  • the discharge portion according to the present disclosure is not limited to the above-mentioned embodiment, and may be formed as a part of the outer shell housing so as to be split when the igniter is activated, for example.
  • the ignition means may include a gas generating agent that is disposed in the ignition chamber and is combusted by the operation of the igniter. By doing so, the energy generated by the activation of the igniter can be increased. In other words, the energy required to open the first communication section, the second communication section, and the discharge section can be increased.
  • a gas generating agent may be added to the ignition chamber. By placing it, you can supplement energy.
  • the first filling chamber S1 includes a first axial region S11 adjacent to the ignition chamber S10 in the axial direction of the outer shell housing 10 with the first partition wall 30 interposed therebetween, and a first partition wall 30. It has a cylindrical first radial region S12 that surrounds the ignition chamber S10 from the radial direction of the outer shell housing 10.
  • the second filling chamber S2 according to the present embodiment is a second axial region adjacent to the first axial region S11 of the first filling chamber S1 in the axial direction of the outer shell housing 10 with the second partition wall 60 in between.
  • the ignition chamber S10, the first axial region S11, and the second axial region S21 are arranged in order from the lower side to the upper side in the axial direction. Further, the ignition chamber S10, the first radial region S12, and the second radial region S22 are arranged in order from the inside to the outside in the radial direction. Since the first filling chamber S1 has the cylindrical first radial region S12, the length of the first filling chamber S1 in the axial direction can be shortened while securing the volume for filling with gas. .
  • the length of the second filling chamber S2 in the axial direction can be shortened while securing the volume for filling with gas. be able to.
  • the length of the gas generator 100 in the axial direction can be shortened and the gas generator 100 can be downsized.
  • the first communication section 40, the second communication section 70, and the discharge section 50 are arranged on the central axis A1 of the outer shell housing 10, so that the first filling chamber By shortening the axial lengths of S1 and the second filling chamber S2, the distance between the first communication section 40 and the second communication section 70 and the distance between the second communication section 70 and the discharge section 50 can be shortened. can. Thereby, the second communication portion 70 and the discharge portion 50 can be easily opened when the igniter 4 is activated.
  • the outer shell container constituted by the outer shell housing 10 and the diffuser housing 8 is referred to as a gas generator housing 80.
  • the length of the gas generator housing 80 in the axial direction is L1, and the width in the radial direction is W1.
  • the gas generator housing 80 of the gas generator 100 according to the present embodiment is formed in a short cylindrical shape so that the length L1 in the axial direction is shorter than the width W1 in the radial direction. Thereby, the gas generator 100 can be downsized.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
PCT/JP2023/031905 2022-09-22 2023-08-31 ガス発生器 WO2024062900A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202380067345.6A CN119894730A (zh) 2022-09-22 2023-08-31 气体发生器
DE112023003901.1T DE112023003901T5 (de) 2022-09-22 2023-08-31 Gasgenerator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022151374A JP2024046153A (ja) 2022-09-22 2022-09-22 ガス発生器
JP2022-151374 2022-09-22

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WO2024062900A1 true WO2024062900A1 (ja) 2024-03-28

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JP (1) JP2024046153A (enrdf_load_stackoverflow)
CN (1) CN119894730A (enrdf_load_stackoverflow)
DE (1) DE112023003901T5 (enrdf_load_stackoverflow)
WO (1) WO2024062900A1 (enrdf_load_stackoverflow)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001080449A (ja) * 1994-10-25 2001-03-27 Oea Inc コンパクトハイブリッドインフレータ
JP2005199867A (ja) * 2004-01-15 2005-07-28 Daicel Chem Ind Ltd エアバッグ用ガス発生器
JP2009119893A (ja) * 2007-11-12 2009-06-04 Daicel Chem Ind Ltd ガス発生器
US20100283231A1 (en) * 2008-01-15 2010-11-11 Autoliv Development Ab Inflator for an air-bag
US20120266774A1 (en) * 2009-11-25 2012-10-25 Autoliv Development Ab Gas generator with reactive gases

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001080449A (ja) * 1994-10-25 2001-03-27 Oea Inc コンパクトハイブリッドインフレータ
JP2005199867A (ja) * 2004-01-15 2005-07-28 Daicel Chem Ind Ltd エアバッグ用ガス発生器
JP2009119893A (ja) * 2007-11-12 2009-06-04 Daicel Chem Ind Ltd ガス発生器
US20100283231A1 (en) * 2008-01-15 2010-11-11 Autoliv Development Ab Inflator for an air-bag
US20120266774A1 (en) * 2009-11-25 2012-10-25 Autoliv Development Ab Gas generator with reactive gases

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JP2024046153A (ja) 2024-04-03
CN119894730A (zh) 2025-04-25

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