WO2018088133A1 - Gas generator - Google Patents

Gas generator Download PDF

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Publication number
WO2018088133A1
WO2018088133A1 PCT/JP2017/037318 JP2017037318W WO2018088133A1 WO 2018088133 A1 WO2018088133 A1 WO 2018088133A1 JP 2017037318 W JP2017037318 W JP 2017037318W WO 2018088133 A1 WO2018088133 A1 WO 2018088133A1
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WO
WIPO (PCT)
Prior art keywords
hole
bottom plate
flat plate
igniter
wall portion
Prior art date
Application number
PCT/JP2017/037318
Other languages
French (fr)
Japanese (ja)
Inventor
福井勇貴
山▲崎▼征幸
小林睦治
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
Publication of WO2018088133A1 publication Critical patent/WO2018088133A1/en

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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
    • B60R21/263—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 variable source, e.g. plural stage or controlled output
    • 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

Definitions

  • This invention relates to the gas generator which can be used for the airbag apparatus of a motor vehicle.
  • a gas generator used in an airbag apparatus includes two igniters attached to a bottom plate of a housing and two combustion chambers filled with a gas generating agent corresponding to the two igniters.
  • a dual type gas generator is used.
  • the dual type gas generator is one in which two igniters can be operated at different times or simultaneously, and during operation, a large pressure is applied to the top and bottom plates of the housing. It will be. In this way, when a large pressure is applied to the top plate and the bottom plate during operation and they are deformed in the axial direction, the connection between the igniter attached to the bottom plate and the connector may be loosened, or the connector may fall off. is there.
  • FIG. 1 shows a state in which the igniter 4 is fixed to the base 16 via a non-conductive body 8.
  • the present invention provides a housing comprising a top plate, a bottom plate in a position facing the top plate in the axial direction, and a peripheral wall portion formed with a gas discharge port between the top plate and the bottom plate.
  • the bottom plate has a flat plate portion, a first hole portion for fixing the first igniter formed separately from the flat plate portion, and a second hole portion for attaching the second igniter.
  • it has a second bottom plate member arranged in contact with the bottom plate,
  • the second bottom plate member has a second flat plate portion and two through-holes, and the two through-holes are at positions that face the first hole portion and the second hole portion of the bottom plate in the axial direction.
  • a first through hole and a second through hole formed,
  • the first igniter is disposed through both the first hole portion and the first through hole, and a flat plate portion around the first hole portion and a second flat plate portion around the first through hole via resin.
  • the second igniter is disposed through both the second hole portion and the second through hole, and a flat plate portion around the second hole portion and a second flat plate portion around the second through hole via resin.
  • a gas generator is provided that is fixed with respect to.
  • FIG. 1 is an axial sectional view of a gas generator of the present invention.
  • FIG. 2 is a partial cross-sectional view in the axial direction showing the arrangement of the bottom plate and the second bottom plate member in FIG.
  • the present invention provides a gas generator in which a housing bottom plate is reinforced and deformation of the housing bottom plate side is suppressed during operation.
  • the second bottom plate member is disposed on the bottom plate of the housing, and the housing bottom plate has a double structure.
  • the flat plate portion at the periphery of the first hole portion of the bottom plate and the flat plate portion at the periphery of the first through hole of the second bottom plate member are connected via resin, and the flat plate at the periphery of the second hole portion of the bottom plate.
  • the flat plate portion around the second through hole of the second bottom plate member is connected via a resin.
  • the connector connected to supply the ignition current is prevented from being loosened or dropped.
  • the connector connecting portion (connector housing portion) of the gas generator housing is formed of resin, but the connector connecting portion may be deformed or damaged by deformation of the housing bottom plate or the second bottom plate member. Yes, there are cases where the connector can be easily removed, and there is room for improvement.
  • the gas generator of the present invention is improved because deformation of the bottom plate and the second bottom plate member itself is suppressed.
  • the first hole formed in the flat plate portion of the bottom plate serves as a first fixing portion for fixing the first igniter, and the flat plate around the first hole portion.
  • a first cylindrical wall portion extending in the direction of the top plate from the portion through the inside of the first through hole, and a first annular surface portion extending radially inward from the first cylindrical wall portion.
  • the first igniter is fixed to the first fixing part via a resin
  • the 2nd cylindrical wall extended in the top plate direction from the flat plate part of the circumference of the 2nd above-mentioned penetration hole in which the 2nd penetration hole of the above-mentioned 2nd bottom board member serves as the 2nd fixation part for fixing the 2nd igniter
  • a second annular surface portion extending radially inward from the second cylindrical wall portion, and the second igniter is fixed to the second fixing portion via a resin. is there.
  • the bottom plate of the housing has the first fixing portion including the first cylindrical wall portion and the first annular surface portion, the bonding strength between the bottom plate and the resin portion is high. Further, the first cylindrical wall portion of the bottom plate is passed through the first through hole of the second bottom plate member, the first cylindrical wall portion of the bottom plate and the first through hole of the second bottom plate member are in contact with each other, and resin is used. Since the displacement of the second bottom plate member is prevented even when fixed, the reinforcing effect of the housing bottom plate after being integrated with resin is enhanced. By adjusting the outer diameter of the first cylindrical wall portion of the bottom plate and the inner diameter of the first through hole of the second bottom plate member, the first cylindrical shape of the bottom plate with respect to the first through hole of the second bottom plate member.
  • the wall portion may be press-fitted. Since the 2nd bottom plate member has the 2nd fixed part which consists of the 2nd cylindrical wall part and the 2nd annular surface part, the joint strength of the 2nd bottom plate member and the resin part is raised.
  • the bottom plate and the second bottom plate member of the housing are overlapped and fixed by the resin. In this case, the bottom plate and the second bottom plate member of the housing may be fixed together when each igniter is fixed with resin in a state of being overlapped with each other. Alternatively, the bottom plate and the second bottom plate member may be fixed by injecting the resin again with the bottom plate and the second bottom plate member overlapped with each igniter being fixed in advance with the resin.
  • the first annular surface portion has a first annular groove on at least one of the top plate side surface and the bottom plate side surface, The resin is also in the one annular groove, The second annular surface portion has a second annular groove on at least one surface of the top plate side surface and the bottom plate side surface, and resin enters the second annular groove.
  • the flat plate portion at the periphery of the second hole portion of the bottom plate is extended radially inward from the axial formation position of the second cylindrical wall portion, and the inner surface and the outer surface of the flat plate portion at the periphery of the second hole portion.
  • the bottom plate has an annular groove on at least one surface thereof.
  • a first annular groove is formed on one or both sides of the first annular surface portion of the housing bottom plate, and the resin enters the first annular groove.
  • the joint strength between the annular surface portion and the first igniter via the resin is further increased.
  • a second annular groove is formed on one side or both sides of the second annular surface portion of the second bottom plate member, and the resin enters the second annular groove, so that the second tubular shape of the second bottom plate member is obtained.
  • the bonding strength of the wall portion, the second annular surface portion, and the second igniter through the resin is further increased.
  • the housing bottom plate has a bottom plate annular groove on at least one of the inner side surface and the outer side surface of the flat plate portion at the periphery of the second hole portion, the bonding strength between the second hole portion of the bottom plate and the resin is increased. Yes. In either case, the bonding strength is increased, and moisture can be prevented from entering from the gap.
  • the second bottom plate member includes a second flat plate portion in which the first through hole and the second through hole are formed, and an outer peripheral edge portion of the second flat plate portion. And has an outer annular wall portion extended to the top plate side, A boundary portion between the second flat plate portion and the outer annular wall portion is in contact with a boundary portion between the bottom plate and the peripheral wall portion, and the outer annular wall portion is in contact with the peripheral wall portion.
  • the outer annular wall portion of the second bottom plate member is in contact with the peripheral wall portion of the bottom plate and the second bottom plate member is prevented from shifting even during assembly, the reinforcing effect of the housing bottom plate after being integrated with resin Has also been raised. Further, since the outer annular wall portion of the second bottom plate member is in contact with the peripheral wall portion of the bottom plate, the pressure resistance when pressure is applied to the bottom plate side during operation is enhanced.
  • the bottom plate of the housing is reinforced, deformation of the bottom plate of the housing is suppressed even when the internal pressure of the housing increases during operation. For this reason, it is possible to prevent the connector connected to the igniter from loosening or falling off.
  • the gas generator of the present invention can be used as a gas generator for an airbag device mounted on an automobile.
  • FIG. 1 An embodiment (dual type) of a gas generator of the present invention will be described with reference to FIG.
  • the gas generator 1 of the present invention is characterized by the combination of the bottom plate 20 and the second bottom plate member 30, and the types of other components and their arrangement can be modified as appropriate.
  • the gas generator 1 has a housing 10 composed of a diffuser shell 11 and a closure shell 16. Both the diffuser shell 11 and the closure shell 16 are made of metal such as iron or stainless steel.
  • the diffuser shell 11 has a top plate 12 and an upper peripheral wall portion 13, and a plurality of gas discharge ports 14 are formed in the upper peripheral wall portion 13 at equal intervals in the circumferential direction.
  • the upper peripheral wall portion 13 has a flange portion 15 at the opening.
  • the plurality of gas discharge ports 14 are closed from the inside with a metal seal tape.
  • the closure shell 16 has a bottom plate 20 and a lower peripheral wall portion 17.
  • the bottom plate 20 is formed separately from the flat plate portion 21, the flat plate portion 21, the first hole portion 28 for fixing the first igniter 42, and the second hole for attaching the second igniter 52.
  • a portion 29 is provided.
  • a second bottom plate member 30 is disposed on the bottom plate 20.
  • the second bottom plate member 30 includes a second flat plate portion 31, a first through hole 38 and a second through hole 39 which are separately formed in the second flat plate portion 31, and the second flat plate portion 31.
  • the outer peripheral wall portion 36 has an outer annular wall portion 36 extended toward the top plate 12 side.
  • the first through hole 38 is formed at a position facing the first hole 28 in the axis X direction
  • the second through hole 39 is formed at a position facing the second hole 29 in the axis X direction.
  • the first hole portion 28 formed in the flat plate portion 21 of the bottom plate 20 extends from the flat plate portion 21 at the periphery of the first hole portion 28 toward the top plate 12 through the inside of the first through hole 38. It has the 1st fixing
  • fixed part 22 which consists of the wall part 22a and the 1st annular surface part 22b extended in the radial inside from the 1st cylindrical wall part 22a.
  • the first annular surface portion 22b has a 1a annular groove 24 on the surface on the top plate 12 side, and a 1b annular groove 25 on the surface on the bottom plate 20 side.
  • the second through hole 39 of the second bottom plate member 30 has a second cylindrical wall portion 32a extending in the direction of the top plate 12 from the flat plate portion 31 at the periphery of the second through hole 39, and a radius from the second cylindrical wall portion 32a. It has the 2nd fixing
  • the second annular surface portion 32b has a second a annular groove 34 on the surface on the top plate 12 side, and has a second b annular groove 35 on the surface on the bottom plate 20 side.
  • the flat plate portion 21 at the periphery of the second hole portion 29 of the bottom plate is extended radially inward from the formation position in the axis X direction of the second cylindrical wall portion 32a (the flat plate extension portion 21a).
  • An inner annular groove 26 is provided on the inner side surface (surface in the inner direction of the housing 10) of the peripheral flat plate portion 21, and an outer annular groove 27 is provided on the outer side surface.
  • the bottom plate 20 and the second bottom plate member 30 are in contact with the flat plate portion 21 of the bottom plate 20 and the second flat plate portion 31 of the second bottom plate member 30, and are secondly connected to the boundary between the lower peripheral wall portion 17 and the flat plate portion 21 of the bottom plate 20.
  • a boundary portion between the flat plate portion 31 and the outer annular wall portion 36 is in contact with the lower peripheral wall portion 17, and a part of the outer annular wall portion 36 is in contact with the lower peripheral wall portion 17.
  • the first igniter 42 is disposed through the first hole 28 and the first through hole 38, and the first fixing portion 22 (first cylindrical wall portion around the periphery of the first hole 28 via the resin portion 90. 22a, the first annular surface portion 22b) and the flat plate portion 21 are fixed.
  • the second igniter 52 is disposed so as to pass through both the second hole 29 and the second through hole 39, and the second fixing part 32 (second cylindrical wall on the periphery of the second hole is interposed through the resin part 90. Portion 32 a, second annular surface portion 32 b) and the flat plate portion 21 (flat plate extension portion 21 a) around the second hole 29.
  • the second flat plate portion 31 of the second bottom plate member 30 is brought into contact with the flat plate portion 21 of the bottom plate 20 to be reinforced by a double structure.
  • the second bottom plate member 30, which is a separate member, is combined with the bottom plate 20, it is easy to form the first fixing portion 22 that fixes the first igniter 42 and the second fixing portion 32 that fixes the second igniter 52. It has become.
  • the first fixing portion 22 and the second fixing portion 32 are formed as separate members so that the distance between them can be made narrower, the radial width of the housing 10 can also be reduced, and the gas generator 1 can be downsized. Can now also.
  • first fixing portion 22 of the bottom plate 20 and the second fixing portion 32 of the second bottom plate member 30 are integrated with the same resin portion 90, so that the reinforcing effect is enhanced.
  • the bottom plate 20 can be reinforced by increasing the thickness of the bottom plate 20 in place of the double structure, but in that case, the first fixed portion 22 and the second fixed portion 32 are manufactured in the proximity of each other.
  • the closure shell 16 is formed by a press that is easy to process, it is difficult to reduce the thickness of the lower peripheral wall portion 17 and increase the thickness of the flat plate portion 21.
  • the housing 10 is welded and fixed at the contact portion in a state in which the inner surface near the opening of the upper peripheral wall portion 13 of the diffuser shell 11 and the outer surface near the opening of the lower peripheral wall portion 17 of the closure shell 16 are in contact. . Since the housing 10 is in a state in which the closure shell 16 enters the diffuser shell 11, an annular step surface 19 is formed between the annular end surfaces of the upper peripheral wall portion 13 and the lower peripheral wall portion 17.
  • the inside of the housing 10 is separated into a first combustion chamber 40 on the top plate 12 side and a second combustion chamber 50 on the bottom plate 20 side by partition walls 60 arranged in the radial direction.
  • a first gas generating agent 41 is accommodated in the first combustion chamber 40, and a second gas generating agent 51 is accommodated in the second combustion chamber 50.
  • the partition wall 60 has one through hole 61 formed at a position eccentric from the central axis X of the housing 10 toward the peripheral wall portions (the upper peripheral wall portion 13 and the lower peripheral wall portion 17), and a second communication hole 79. Yes.
  • the second communication hole 79 includes a plurality of through holes.
  • the partition wall 60 includes a flat portion 62, an outer annular wall portion 63 that extends from the outer peripheral edge of the flat portion 62 toward the top plate 12, and an outer annular surface portion 64 that protrudes radially outward from the outer annular wall portion 63. is doing.
  • the partition wall 60 has an inner annular wall portion 65 extended from the inner peripheral edge portion along the through hole 61 of the flat surface portion 62 toward the top plate 12 side. In the partition wall 60, the outer annular surface portion 64 is in contact with the annular step surface 19, the outer annular wall portion 63 is in contact with the lower peripheral wall portion 17, and the inner annular wall portion 65 is in contact with the inner cylindrical member 70.
  • An inner cylinder member 70 is disposed in the housing 10 so as to surround the first igniter 42.
  • the inner cylinder member 70 is preferably made of the same material as the housing 10.
  • the inner cylinder member 70 is in contact with the bottom plate 20 with the first end opening 71 side surrounding the first cylindrical wall portion 22a, and the second end opening 72 side passes through the through hole 61 of the partition wall 60 and is first. It arrange
  • the inner cylinder member 70 has a first end opening 71 on the bottom plate 20 side and a second end opening 72 on the top plate 12 side.
  • the first end opening 71 is formed with a flange portion 71a.
  • the two-end opening 72 is formed with an inner annular portion 73 protruding inward in the radial direction.
  • the inner cylinder member 70 shown in FIG. 1 has an outer diameter that changes from the first end opening 71 toward the second end opening 72, and has a large diameter portion 74 and a second end on the first end opening 71 side. It consists of a small diameter portion 76 on the opening 72 side, and an inclined surface portion 75 between the large diameter portion 74 and the small diameter portion 76.
  • the large diameter portion 74 is fitted in contact with the first cylindrical wall portion 22a, and the flange portion 71a is the peripheral portion of the first through hole 38 of the second bottom plate member 30 (the peripheral second flat plate portion 31). Is holding down.
  • the tip portion of the small diameter portion 76 protrudes above the inner annular wall portion 65 (on the first combustion chamber 40 side).
  • the inside of the inner cylinder member 70 is a housing space for the first igniter 42, and when the transfer charge is stored, the remaining space excluding the first igniter 42 is a transfer charge chamber 78.
  • the second end opening 72 is closed by a first closing member 67 made of a seal tape attached to the inner annular portion 73 from the first combustion chamber 40 side, and in operation, the transfer charge chamber 78 and the first combustion chamber. It becomes the 1st communicating hole which connects 40.
  • the plurality of second communication holes 79 communicate the second combustion chamber 50 and the first combustion chamber 40 during operation.
  • the second communication hole 79 is formed in both the position facing the second igniter 52 in the axial direction and the position not facing the axial direction, but it does not face the axial direction.
  • the second communication hole 79 may be formed only at the position.
  • the plurality of second communication holes 79 are closed from the first combustion chamber 40 side by a second closing member 77 made of a metal adhesive tape. If the second communication hole 79 is formed only at a position that does not face the second igniter 52 in the axial direction, the second closing member 77 is not directly cleaved by the combustion product of the second igniter 52. It is preferable because the pressure of the second combustion chamber 50 can be increased and the combustibility of the entire second gas generating agent 51 becomes high.
  • a cylindrical filter 80 is disposed.
  • the first end surface 81 is in contact with the top plate 12
  • the second end surface 82 is in contact with the flat portion 62 of the partition wall 60
  • the lower part (the bottom plate 20 side) of the outer peripheral surface 83 is the outer annular wall. It is in contact with the part 63.
  • a cylindrical gap is formed between the cylindrical filter 80 and the upper peripheral wall portion 13 having the gas discharge port 14.
  • the closure shell 16 having the bottom plate 20 and the second bottom plate member 30 are arranged in combination as shown in FIG. 2, and further, the first igniter 42 and the second igniter 52 are arranged. Thereafter, the molten thermoplastic resin forming the resin part 90 is injection-molded, whereby the first igniter 42 is fixed to the first fixing part 22 of the bottom plate 20 of the closure shell 16 by the resin part 90, and the second bottom plate The second igniter 52 is fixed to the second fixing portion 32 of the member 30 by the resin portion 90, and the closure shell 16 and the second bottom plate member 30 are fixed by the resin portion 90.
  • the operation when the gas generator 1 of FIG. 1 is attached to the airbag device will be described.
  • the first igniter 42 and the second igniter 52 are operated simultaneously as well as the first igniter 42 is operated first and the second igniter 52 is operated with a delay. This is effective even when the first igniter 42 is operated.
  • the first igniter 42 will be described based on the first operation.
  • the transfer charge in the transfer charge chamber 78 is ignited and burned by a flame generated from the first igniter 42, and a combustion product is generated.
  • the combustion products generated in the charge transfer chamber 78 are converged by the action of the inner annular portion 73 of the inner cylinder member 70 and go straight, break the first closing member 67, and the second end opening 72 and the top plate 12.
  • the first gas generating agent 41 between the two is ignited and burned, it collides with the top plate 12.
  • the combustion gas generated by the combustion of the first gas generating agent 41 passes through the cylindrical filter 80, then breaks the seal tape and is discharged from the gas discharge port 14 to inflate the airbag.
  • the second gas generating agent 51 When the second igniter 52 is operated, the second gas generating agent 51 is ignited and combusted to generate combustion gas.
  • the generated combustion gas breaks through the second closing member 77 and flows into the first combustion chamber 40 from the second communication hole 79, passes through the cylindrical filter 80, and is discharged from the gas discharge port 14, and further passes through the air bag. Inflate.
  • a gas generator in which a combustion chamber is divided vertically by a partition wall 60 as shown in FIG. 1 is shown. It is not limited.
  • the shape and arrangement of the partition wall 60 and the cylindrical filter 80 are changed so that the first combustion chamber is formed on the bottom plate 20 side and the first combustion chamber as shown in US Pat. No. 6,032,979 surrounds the second combustion chamber. Even in such a structure, the technology of the present invention can be applied.

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

Abstract

The present invention provides a gas generator which is provided with a housing comprising: a top plate; a bottom plate located in a position facing the top plate in the axial direction; and a circumferential wall part having, formed therein, gas discharge ports located between the top plate and the bottom plate. The bottom plate is provided with: a flat plate part; and a first hole for fixing a first igniter and a second hole for attaching a second igniter, said holes being formed in the flat plate part so as to be separated from each other. A second bottom plate member is provided which is disposed in contact with the top of the bottom plate. The second bottom plate member is provided with: a second flat plate part; and a first through hole and a second through hole which are formed in positions facing the first hole and the second hole in the bottom plate in the axial direction. The first igniter is provided passing through both the first hole and the first through hole, and is fixed to the flat plate part at the circumferential edge of the first hole and the second flat plate part at the circumferential edge of the first through hole via a resin. The second igniter is provided passing through both the second hole and the second through hole, and is fixed to the flat plate part at the circumferential edge of the second hole and the second flat plate part at the circumferential edge of the second through hole via a resin.

Description

ガス発生器Gas generator
　本発明は、自動車のエアバッグ装置に使用できるガス発生器に関する。 This invention relates to the gas generator which can be used for the airbag apparatus of a motor vehicle.
背景技術
　エアバッグ装置に使用するガス発生器には、ハウジングの底板に取り付けられた二つの点火器と、前記二つの点火器に対応するガス発生剤が充填された二つの燃焼室を有している、デュアルタイプのガス発生器が使用されている。デュアルタイプのガス発生器は、二つの点火器が時間差をおいて作動したり、同時に作動したりすることができるものであり、作動時には、ハウジングの天板と底板に対して大きな圧力が加えられることになる。このように作動時において天板と底板に大きな圧力が加えられ、それらが軸方向に変形したとき、底板に取り付けられた点火器とコネクタの接続が緩んだり、またはコネクタが脱落したりするおそれもある。時間差をおいて作動した場合でも、第１点火器の作動時の底板への圧力でコネクタが緩んだり、脱落したりしたときには第２点火器の作動に影響を与えることになり、第２点火器の作動後にコネクタが脱落したときでも、脱落したコネクタにより周辺部品が損傷するおそれがある。 BACKGROUND ART A gas generator used in an airbag apparatus includes two igniters attached to a bottom plate of a housing and two combustion chambers filled with a gas generating agent corresponding to the two igniters. A dual type gas generator is used. The dual type gas generator is one in which two igniters can be operated at different times or simultaneously, and during operation, a large pressure is applied to the top and bottom plates of the housing. It will be. In this way, when a large pressure is applied to the top plate and the bottom plate during operation and they are deformed in the axial direction, the connection between the igniter attached to the bottom plate and the connector may be loosened, or the connector may fall off. is there. Even when the operation is performed with a time difference, if the connector is loosened or dropped due to the pressure applied to the bottom plate during the operation of the first igniter, the operation of the second igniter will be affected. Even when the connector is dropped after the operation of, the dropped connector may damage peripheral components.
　ＵＳ６，７６３，７６４Ｂ２の図１、図２には、二つの点火器４が、リテーナ６に対して非導電性のボディー８（例えばナイロンやプラスチックなどもモールド可能なもの）によって固定された点火器システムが開示されている。図２のリテーナ６は単一の構造体２０であり、図１のリテーナ６は二つに分離されているが、いずれも点火器４が取り付けられる部分を略筒状に変形させ（略筒状部を形成させ）、それぞれの貫通孔に導電ピン１４を貫通させた状態で、非導電性のボディー８によって点火器４と一体化している。図１には、ベース１６に対して、非導電性のボディー８を介して点火器４が固定された状態が示されている。 1 and 2 of US Pat. No. 6,763,764B2, an igniter in which two igniters 4 are fixed to a retainer 6 by a non-conductive body 8 (for example, nylon or plastic can be molded). A system is disclosed. The retainer 6 in FIG. 2 is a single structure 20, and the retainer 6 in FIG. 1 is separated into two parts. In either case, the portion to which the igniter 4 is attached is deformed into a substantially cylindrical shape (substantially cylindrical shape). The non-conductive body 8 is integrated with the igniter 4 in a state where the conductive pins 14 are passed through the respective through holes. FIG. 1 shows a state in which the igniter 4 is fixed to the base 16 via a non-conductive body 8.
本発明の開示
　本発明は、天板と、前記天板と軸方向に対向する位置にある底板と、前記天板と前記底板の間にあるガス排出口が形成された周壁部からなるハウジングを有しており、
　前記底板が、平板部と、前記平板部にそれぞれ分離して形成された、第１点火器を固定するための第１穴部と、第２点火器を取り付けるための第２穴部を有しており、
　さらに前記底板の上に当接されて配置された第２底板部材を有しており、
　前記第２底板部材が第２平板部と二つの貫通孔を有しており、前記二つの貫通孔が、前記底板の第１穴部と第２穴部に対して軸方向に対向する位置に形成された第１貫通孔と第２貫通孔であり、
　前記第１点火器が、第１穴部と第１貫通孔の両方に通されて配置され、樹脂を介して前記第１穴部周縁の平板部と前記第１貫通孔周縁の第２平板部に対して固定されているものであり、
　前記第２点火器が、第２穴部と第２貫通孔の両方に通されて配置され、樹脂を介して前記第２穴部周縁の平板部と前記第２貫通孔周縁の第２平板部に対して固定されているものである、ガス発生器を提供する。 DISCLOSURE OF THE INVENTION The present invention provides a housing comprising a top plate, a bottom plate in a position facing the top plate in the axial direction, and a peripheral wall portion formed with a gas discharge port between the top plate and the bottom plate. Have
The bottom plate has a flat plate portion, a first hole portion for fixing the first igniter formed separately from the flat plate portion, and a second hole portion for attaching the second igniter. And
Furthermore, it has a second bottom plate member arranged in contact with the bottom plate,
The second bottom plate member has a second flat plate portion and two through-holes, and the two through-holes are at positions that face the first hole portion and the second hole portion of the bottom plate in the axial direction. A first through hole and a second through hole formed,
The first igniter is disposed through both the first hole portion and the first through hole, and a flat plate portion around the first hole portion and a second flat plate portion around the first through hole via resin. Is fixed against
The second igniter is disposed through both the second hole portion and the second through hole, and a flat plate portion around the second hole portion and a second flat plate portion around the second through hole via resin. A gas generator is provided that is fixed with respect to.
　本発明は、以下の詳細な説明と添付された図面により、さらに完全に理解されるものであるが、これらはただ説明のため付されるものであり、本発明を制限するものではない。 The present invention will be more fully understood from the following detailed description and the accompanying drawings. However, these are merely for the purpose of explanation and are not intended to limit the present invention.
図１は、本発明のガス発生器の軸方向断面図である。FIG. 1 is an axial sectional view of a gas generator of the present invention. 図２は、図１における底板と第２底板部材の配置状態を示す軸方向の部分断面図である。FIG. 2 is a partial cross-sectional view in the axial direction showing the arrangement of the bottom plate and the second bottom plate member in FIG.
本発明の詳細な説明
　本発明は、ハウジング底板が補強されており、作動時において前記ハウジング底板側の変形が抑制されているガス発生器を提供する。 DETAILED DESCRIPTION OF THE INVENTION The present invention provides a gas generator in which a housing bottom plate is reinforced and deformation of the housing bottom plate side is suppressed during operation.
　本発明のガス発生器は、ハウジングの底板の上に第２底板部材が配置され、ハウジング底板が二重構造になっている。また本発明のガス発生器は、底板の第１穴部周縁の平板部と第２底板部材の第１貫通孔周縁の平板部が樹脂を介して接続され、底板の第２穴部周縁の平板部と第２底板部材の第２貫通孔周縁の平板部が樹脂を介して接続されている。このように本発明のガス発生器では、ハウジングの底板側が補強されているため、作動時における圧力を受けても底板および第２底板部材が変形し難くなっており、それに起因して点火器に着火電流を供給するために接続されたコネクタが緩んだり、脱落したりすることが防止されている。特にガス発生器ハウジングのコネクタ接続部（コネクタ収容部）を樹脂で形成する実施形態があるが、ハウジング底板、あるいは第２底板部材の変形によってコネクタ接続部も変形したり、損傷したりすることがあり、コネクタが抜けやすくなる場合があり、改善の余地がある。しかし、本発明のガス発生器では底板および第２底板部材の変形自体が抑制されることから改善されている。 In the gas generator of the present invention, the second bottom plate member is disposed on the bottom plate of the housing, and the housing bottom plate has a double structure. In the gas generator of the present invention, the flat plate portion at the periphery of the first hole portion of the bottom plate and the flat plate portion at the periphery of the first through hole of the second bottom plate member are connected via resin, and the flat plate at the periphery of the second hole portion of the bottom plate. The flat plate portion around the second through hole of the second bottom plate member is connected via a resin. As described above, in the gas generator of the present invention, since the bottom plate side of the housing is reinforced, the bottom plate and the second bottom plate member are not easily deformed even when subjected to pressure during operation. The connector connected to supply the ignition current is prevented from being loosened or dropped. In particular, there is an embodiment in which the connector connecting portion (connector housing portion) of the gas generator housing is formed of resin, but the connector connecting portion may be deformed or damaged by deformation of the housing bottom plate or the second bottom plate member. Yes, there are cases where the connector can be easily removed, and there is room for improvement. However, the gas generator of the present invention is improved because deformation of the bottom plate and the second bottom plate member itself is suppressed.
　本発明のガス発生器の好ましい態様は、前記底板の平板部に形成された第１穴部が、第１点火器を固定するための第１固定部となる、前記第１穴部周縁の平板部から前記第１貫通孔の内側を通って天板方向に伸ばされた第１筒状壁部と、前記第１筒状壁部から半径方向内側に伸ばされた第１環状面部を有しており、前記第１点火器が樹脂を介して前記第１固定部に固定されているものであり、
　前記第２底板部材の第２貫通孔が、第２点火器を固定するための第２固定部となる、前記第２貫通孔周縁の平板部から天板方向に伸ばされた第２筒状壁部と、前記第２筒状壁部から半径方向内側に伸ばされた第２環状面部を有しており、前記第２点火器が樹脂を介して前記第２固定部に固定されているものである。 In a preferred aspect of the gas generator of the present invention, the first hole formed in the flat plate portion of the bottom plate serves as a first fixing portion for fixing the first igniter, and the flat plate around the first hole portion. A first cylindrical wall portion extending in the direction of the top plate from the portion through the inside of the first through hole, and a first annular surface portion extending radially inward from the first cylindrical wall portion. And the first igniter is fixed to the first fixing part via a resin,
The 2nd cylindrical wall extended in the top plate direction from the flat plate part of the circumference of the 2nd above-mentioned penetration hole in which the 2nd penetration hole of the above-mentioned 2nd bottom board member serves as the 2nd fixation part for fixing the 2nd igniter And a second annular surface portion extending radially inward from the second cylindrical wall portion, and the second igniter is fixed to the second fixing portion via a resin. is there.
　ハウジングの底板が、第１筒状壁部と第１環状面部からなる第１固定部を有しているため、底板と樹脂部分の接合強度が高くなっている。また底板の第１筒状壁部が第２底板部材の第１貫通孔に通され、底板の第１筒状壁部と第２底板部材の第１貫通孔が当接され、樹脂を使用して固定するときにおいても第２底板部材のずれが防止されているため、樹脂で一体化した後のハウジング底板の補強効果も高められている。底板の第１筒状壁部の外径と第２底板部材の第１貫通孔の内径の大きさを調整することで、第２底板部材の第１貫通孔に対して底板の第１筒状壁部が圧入されるようにしてもよい。第２底板部材が、第２筒状壁部と第２環状面部からなる第２固定部を有しているため、第２底板部材と樹脂部分の接合強度が高められている。ハウジングの底板と第２底板部材は重ねあわされて、前記樹脂によって固定されている。この場合、ハウジングの底板と第２底板部材は、互いに重ねた状態で各々の点火器を樹脂で固定するときに、一緒に固定してもよい。あるいは、予め各点火器を樹脂で固定した状態で、底板と第２底板部材を重ねた状態で再度樹脂を射出して、底板と第２底板部材を固定してもよい。 Since the bottom plate of the housing has the first fixing portion including the first cylindrical wall portion and the first annular surface portion, the bonding strength between the bottom plate and the resin portion is high. Further, the first cylindrical wall portion of the bottom plate is passed through the first through hole of the second bottom plate member, the first cylindrical wall portion of the bottom plate and the first through hole of the second bottom plate member are in contact with each other, and resin is used. Since the displacement of the second bottom plate member is prevented even when fixed, the reinforcing effect of the housing bottom plate after being integrated with resin is enhanced. By adjusting the outer diameter of the first cylindrical wall portion of the bottom plate and the inner diameter of the first through hole of the second bottom plate member, the first cylindrical shape of the bottom plate with respect to the first through hole of the second bottom plate member. The wall portion may be press-fitted. Since the 2nd bottom plate member has the 2nd fixed part which consists of the 2nd cylindrical wall part and the 2nd annular surface part, the joint strength of the 2nd bottom plate member and the resin part is raised. The bottom plate and the second bottom plate member of the housing are overlapped and fixed by the resin. In this case, the bottom plate and the second bottom plate member of the housing may be fixed together when each igniter is fixed with resin in a state of being overlapped with each other. Alternatively, the bottom plate and the second bottom plate member may be fixed by injecting the resin again with the bottom plate and the second bottom plate member overlapped with each igniter being fixed in advance with the resin.
　本発明のガス発生器の別の好ましい態様は、前記第１環状面部が、前記天板側の面と前記底板側の面の少なくとも一方の面に第１環状溝を有しており、前記第１環状溝内にも樹脂が入り込んでいるものであり、
　前記第２環状面部が、前記天板側の面と前記底板側の面の少なくとも一方の面に第２環状溝を有しており、前記第２環状溝内にも樹脂が入り込んでいるものであり、
　前記底板の第２穴部周縁の平板部が、前記第２筒状壁部の軸方向の形成位置よりも半径方向内側に伸ばされ、前記第２穴部周縁の平板部の内側面と外側面の少なくとも一方の面に底板環状溝を有しているものである。 In another preferred aspect of the gas generator of the present invention, the first annular surface portion has a first annular groove on at least one of the top plate side surface and the bottom plate side surface, The resin is also in the one annular groove,
The second annular surface portion has a second annular groove on at least one surface of the top plate side surface and the bottom plate side surface, and resin enters the second annular groove. Yes,
The flat plate portion at the periphery of the second hole portion of the bottom plate is extended radially inward from the axial formation position of the second cylindrical wall portion, and the inner surface and the outer surface of the flat plate portion at the periphery of the second hole portion. The bottom plate has an annular groove on at least one surface thereof.
　ハウジング底板の第１環状面部の一面側または両面側に第１環状溝が形成されており、前記第１環状溝にも樹脂が入り込んでいることで、底板の第１筒状壁部と第１環状面部と第１点火器との樹脂を介した接合強度がより高められている。第２底板部材の第２環状面部の一面側または両面側に第２環状溝が形成されており、前記第２環状溝にも樹脂が入り込んでいることで、第２底板部材の第２筒状壁部と第２環状面部と第２点火器との樹脂を介した接合強度がより高められている。ハウジング底板が、第２穴部周縁の平板部の内側面と外側面の少なくとも一方の面に底板環状溝を有しているため、底板の第２穴部と樹脂との接合強度が高められている。いずれの場合も接合強度が高まり、隙間からの湿気の侵入を阻止することができる。 A first annular groove is formed on one or both sides of the first annular surface portion of the housing bottom plate, and the resin enters the first annular groove. The joint strength between the annular surface portion and the first igniter via the resin is further increased. A second annular groove is formed on one side or both sides of the second annular surface portion of the second bottom plate member, and the resin enters the second annular groove, so that the second tubular shape of the second bottom plate member is obtained. The bonding strength of the wall portion, the second annular surface portion, and the second igniter through the resin is further increased. Since the housing bottom plate has a bottom plate annular groove on at least one of the inner side surface and the outer side surface of the flat plate portion at the periphery of the second hole portion, the bonding strength between the second hole portion of the bottom plate and the resin is increased. Yes. In either case, the bonding strength is increased, and moisture can be prevented from entering from the gap.
　本発明のガス発生器の別の好ましい態様は、前記第２底板部材が、前記第１貫通孔と前記第２貫通孔が形成された第２平板部と、前記第２平板部の外周縁部において前記天板側に伸ばされた外側環状壁部を有しており、
　前記第２平板部と前記外側環状壁部の境界部が前記底板と前記周壁部の境界部に当接され、前記外側環状壁部が前記周壁部に当接されているものである。 In another preferred aspect of the gas generator of the present invention, the second bottom plate member includes a second flat plate portion in which the first through hole and the second through hole are formed, and an outer peripheral edge portion of the second flat plate portion. And has an outer annular wall portion extended to the top plate side,
A boundary portion between the second flat plate portion and the outer annular wall portion is in contact with a boundary portion between the bottom plate and the peripheral wall portion, and the outer annular wall portion is in contact with the peripheral wall portion.
　第２底板部材の外側環状壁部が底板の周壁部に当接されており、組み立て時においても第２底板部材のずれが防止されているため、樹脂で一体化した後のハウジング底板の補強効果も高められている。また第２底板部材の外側環状壁部が底板の周壁部に当接されているため、作動時において底板側に圧力が加えられたときの耐圧性が高められている。 Since the outer annular wall portion of the second bottom plate member is in contact with the peripheral wall portion of the bottom plate and the second bottom plate member is prevented from shifting even during assembly, the reinforcing effect of the housing bottom plate after being integrated with resin Has also been raised. Further, since the outer annular wall portion of the second bottom plate member is in contact with the peripheral wall portion of the bottom plate, the pressure resistance when pressure is applied to the bottom plate side during operation is enhanced.
　本発明のガス発生器は、ハウジングの底板が補強されているため、作動時においてハウジングの内部圧力が上昇した場合でも、ハウジングの底板の変形が抑制される。このため、点火器に接続されているコネクタが緩んだり、脱落したりすることが防止できる。 In the gas generator of the present invention, since the bottom plate of the housing is reinforced, deformation of the bottom plate of the housing is suppressed even when the internal pressure of the housing increases during operation. For this reason, it is possible to prevent the connector connected to the igniter from loosening or falling off.
　本発明のガス発生器は、自動車に搭載するエアバッグ装置のガス発生器として利用することができる。 The gas generator of the present invention can be used as a gas generator for an airbag device mounted on an automobile.
本発明の実施の形態
　本発明のガス発生器の一実施形態（デュアルタイプ）を図１により説明する。本発明のガス発生器１は、底板２０と第２底板部材３０の組み合わせに特徴を有しているものであり、他の部品の種類やそれらの配置などは適宜改変することができる。 Embodiment of the Present Invention An embodiment (dual type) of a gas generator of the present invention will be described with reference to FIG. The gas generator 1 of the present invention is characterized by the combination of the bottom plate 20 and the second bottom plate member 30, and the types of other components and their arrangement can be modified as appropriate.
　ガス発生器１は、ディフューザシェル１１とクロージャシェル１６からなるハウジング１０を有している。ディフューザシェル１１とクロージャシェル１６は、いずれも鉄、ステンレスなどの金属からなるものである。ディフューザシェル１１は、天板１２と上部周壁部１３を有しており、上部周壁部１３には周方向に均等間隔をおいて複数のガス排出口１４が形成されている。上部周壁部１３は開口部にフランジ部１５を有している。複数のガス排出口１４は、内側から金属製のシールテープで閉塞されている。 The gas generator 1 has a housing 10 composed of a diffuser shell 11 and a closure shell 16. Both the diffuser shell 11 and the closure shell 16 are made of metal such as iron or stainless steel. The diffuser shell 11 has a top plate 12 and an upper peripheral wall portion 13, and a plurality of gas discharge ports 14 are formed in the upper peripheral wall portion 13 at equal intervals in the circumferential direction. The upper peripheral wall portion 13 has a flange portion 15 at the opening. The plurality of gas discharge ports 14 are closed from the inside with a metal seal tape.
　クロージャシェル１６は、底板２０と下部周壁部１７を有している。
　底板２０が、平板部２１と、平板部２１にそれぞれ分離して形成された、第１点火器４２を固定するための第１穴部２８と、第２点火器５２を取り付けるための第２穴部２９を有している。底板２０の上には、第２底板部材３０が配置されている。第２底板部材３０は、第２平板部３１と、第２平板部３１にそれぞれ分離して形成された第１貫通孔３８と第２貫通孔３９を有しており、さらに第２平板部３１の外周縁部において天板１２側に伸ばされた外側環状壁部３６を有している。第１貫通孔３８は第１穴部２８と軸Ｘ方向に対向する位置に形成されており、第２貫通孔３９は第２穴部２９と軸Ｘ方向に対向する位置に形成されている。 The closure shell 16 has a bottom plate 20 and a lower peripheral wall portion 17.
The bottom plate 20 is formed separately from the flat plate portion 21, the flat plate portion 21, the first hole portion 28 for fixing the first igniter 42, and the second hole for attaching the second igniter 52. A portion 29 is provided. A second bottom plate member 30 is disposed on the bottom plate 20. The second bottom plate member 30 includes a second flat plate portion 31, a first through hole 38 and a second through hole 39 which are separately formed in the second flat plate portion 31, and the second flat plate portion 31. The outer peripheral wall portion 36 has an outer annular wall portion 36 extended toward the top plate 12 side. The first through hole 38 is formed at a position facing the first hole 28 in the axis X direction, and the second through hole 39 is formed at a position facing the second hole 29 in the axis X direction.
　底板２０の平板部２１に形成された第１穴部２８は、第１穴部２８周縁の平板部２１から第１貫通孔３８の内側を通って天板１２方向に伸ばされた第１筒状壁部２２ａと、第１筒状壁部２２ａから半径方向内側に伸ばされた第１環状面部２２ｂからなる第１固定部２２を有している。第１環状面部２２ｂは、天板１２側の面に第１ａ環状溝２４を有し、底板２０側の面に第１ｂ環状溝２５を有している。 The first hole portion 28 formed in the flat plate portion 21 of the bottom plate 20 extends from the flat plate portion 21 at the periphery of the first hole portion 28 toward the top plate 12 through the inside of the first through hole 38. It has the 1st fixing | fixed part 22 which consists of the wall part 22a and the 1st annular surface part 22b extended in the radial inside from the 1st cylindrical wall part 22a. The first annular surface portion 22b has a 1a annular groove 24 on the surface on the top plate 12 side, and a 1b annular groove 25 on the surface on the bottom plate 20 side.
　第２底板部材３０の第２貫通孔３９は、第２貫通孔３９周縁の平板部３１から天板１２方向に伸ばされた第２筒状壁部３２ａと、第２筒状壁部３２ａから半径方向内側に伸ばされた第２環状面部３２ｂからなる第２固定部３２を有している。第２環状面部３２ｂは、天板１２側の面に第２ａ環状溝３４を有し、底板２０側の面に第２ｂ環状溝３５を有している。底板の第２穴部２９周縁の平板部２１は、第２筒状壁部３２ａの軸Ｘ方向の形成位置よりも半径方向内側に伸ばされており（平板伸長部２１ａ）、第２穴部２９周縁の平板部２１の内側面（ハウジング１０の内部方向の面）には内側環状溝２６を有しており、外側面には外側環状溝２７を有している。底板２０と第２底板部材３０は、底板２０の平板部２１と第２底板部材３０の第２平板部３１が当接され、底板２０の下部周壁部１７と平板部２１の境界部に第２平板部３１と外側環状壁部３６の境界部が当接され、下部周壁部１７に外側環状壁部３６の一部が当接されている。 The second through hole 39 of the second bottom plate member 30 has a second cylindrical wall portion 32a extending in the direction of the top plate 12 from the flat plate portion 31 at the periphery of the second through hole 39, and a radius from the second cylindrical wall portion 32a. It has the 2nd fixing | fixed part 32 which consists of the 2nd annular surface part 32b extended in the direction inner side. The second annular surface portion 32b has a second a annular groove 34 on the surface on the top plate 12 side, and has a second b annular groove 35 on the surface on the bottom plate 20 side. The flat plate portion 21 at the periphery of the second hole portion 29 of the bottom plate is extended radially inward from the formation position in the axis X direction of the second cylindrical wall portion 32a (the flat plate extension portion 21a). An inner annular groove 26 is provided on the inner side surface (surface in the inner direction of the housing 10) of the peripheral flat plate portion 21, and an outer annular groove 27 is provided on the outer side surface. The bottom plate 20 and the second bottom plate member 30 are in contact with the flat plate portion 21 of the bottom plate 20 and the second flat plate portion 31 of the second bottom plate member 30, and are secondly connected to the boundary between the lower peripheral wall portion 17 and the flat plate portion 21 of the bottom plate 20. A boundary portion between the flat plate portion 31 and the outer annular wall portion 36 is in contact with the lower peripheral wall portion 17, and a part of the outer annular wall portion 36 is in contact with the lower peripheral wall portion 17.
　第１点火器４２は、第１穴部２８と第１貫通孔３８に通されて配置され、樹脂部９０を介して第１穴部２８周縁の第１固定部２２（第１筒状壁部２２ａ、第１環状面部２２ｂ）および平板部２１に対して固定されている。第２点火器５２は、第２穴部２９と第２貫通孔３９の両方に通されて配置され、樹脂部９０を介して第２穴部周縁の第２固定部３２（第２筒状壁部３２ａ、第２環状面部３２ｂ）および第２穴部２９周縁の平板部２１（平板伸長部２１ａ）に対して固定されている。 The first igniter 42 is disposed through the first hole 28 and the first through hole 38, and the first fixing portion 22 (first cylindrical wall portion around the periphery of the first hole 28 via the resin portion 90. 22a, the first annular surface portion 22b) and the flat plate portion 21 are fixed. The second igniter 52 is disposed so as to pass through both the second hole 29 and the second through hole 39, and the second fixing part 32 (second cylindrical wall on the periphery of the second hole is interposed through the resin part 90. Portion 32 a, second annular surface portion 32 b) and the flat plate portion 21 (flat plate extension portion 21 a) around the second hole 29.
　図１に示すガス発生器１では、底板２０の平板部２１に第２底板部材３０の第２平板部３１が当接されて二重構造にされることで補強されている。また、別部材の第２底板部材３０を底板２０と組み合わせているため、第１点火器４２を固定する第１固定部２２と第２点火器５２を固定する第２固定部３２の形成が容易になっている。また、第１固定部２２と第２固定部３２を別部材にすることでそれらの間隔がより狭くできるようになったため、ハウジング１０の半径方向の幅も小さくでき、ガス発生器１の小型化もできるようになった。さらに底板２０の第１固定部２２と第２底板部材３０の第２固定部３２（底板２０と第２底板部材３０）は、同じ樹脂部９０で一体にされることによっても補強効果が高められている。なお、底板２０を二重構造にすることに替えて底板２０の厚みを大きくすることでも補強できるが、その場合には第１固定部２２と第２固定部３２を近接した状態で製造することが困難になるほか、加工の容易なプレスでクロージャシェル１６を成形するときに、下部周壁部１７の肉厚を薄くし、平板部２１を肉厚にするという加工が難しくなる。 In the gas generator 1 shown in FIG. 1, the second flat plate portion 31 of the second bottom plate member 30 is brought into contact with the flat plate portion 21 of the bottom plate 20 to be reinforced by a double structure. Further, since the second bottom plate member 30, which is a separate member, is combined with the bottom plate 20, it is easy to form the first fixing portion 22 that fixes the first igniter 42 and the second fixing portion 32 that fixes the second igniter 52. It has become. Further, since the first fixing portion 22 and the second fixing portion 32 are formed as separate members so that the distance between them can be made narrower, the radial width of the housing 10 can also be reduced, and the gas generator 1 can be downsized. Can now also. Further, the first fixing portion 22 of the bottom plate 20 and the second fixing portion 32 of the second bottom plate member 30 (the bottom plate 20 and the second bottom plate member 30) are integrated with the same resin portion 90, so that the reinforcing effect is enhanced. ing. The bottom plate 20 can be reinforced by increasing the thickness of the bottom plate 20 in place of the double structure, but in that case, the first fixed portion 22 and the second fixed portion 32 are manufactured in the proximity of each other. In addition, when the closure shell 16 is formed by a press that is easy to process, it is difficult to reduce the thickness of the lower peripheral wall portion 17 and increase the thickness of the flat plate portion 21.
　ハウジング１０は、ディフューザシェル１１の上部周壁部１３の開口部近傍の内側面とクロージャシェル１６の下部周壁部１７の開口部近傍の外側面が接触した状態で、前記接触部分において溶接固定されている。ハウジング１０は、ディフューザシェル１１内にクロージャシェル１６が入り込んだ状態になっているため、上部周壁部１３と下部周壁部１７の環状端面の間で環状段差面１９が形成されている。 The housing 10 is welded and fixed at the contact portion in a state in which the inner surface near the opening of the upper peripheral wall portion 13 of the diffuser shell 11 and the outer surface near the opening of the lower peripheral wall portion 17 of the closure shell 16 are in contact. . Since the housing 10 is in a state in which the closure shell 16 enters the diffuser shell 11, an annular step surface 19 is formed between the annular end surfaces of the upper peripheral wall portion 13 and the lower peripheral wall portion 17.
　ハウジング１０内は、半径方向に配置された隔壁６０によって、天板１２側の第１燃焼室４０と底板２０側の第２燃焼室５０に分離されている。第１燃焼室４０内には第１ガス発生剤４１が収容され、第２燃焼室５０内には第２ガス発生剤５１が収容されている。 The inside of the housing 10 is separated into a first combustion chamber 40 on the top plate 12 side and a second combustion chamber 50 on the bottom plate 20 side by partition walls 60 arranged in the radial direction. A first gas generating agent 41 is accommodated in the first combustion chamber 40, and a second gas generating agent 51 is accommodated in the second combustion chamber 50.
　隔壁６０は、ハウジング１０の中心軸Ｘからは周壁部（上部周壁部１３と下部周壁部１７）側に偏心した位置に形成された一つの貫通孔６１と、第２連通孔７９を有している。第２連通孔７９は複数の貫通孔からなる。
　隔壁６０は、平面部６２、平面部６２の外周縁部から天板１２側に伸ばされた外側環状壁部６３、外側環状壁部６３から半径方向の外側に突き出された外側環状面部６４を有している。さらに隔壁６０は、平面部６２の貫通孔６１に沿った内周縁部から天板１２側に伸ばされた内側環状壁部６５を有している。隔壁６０は、外側環状面部６４が環状段差面１９に当接され、外側環状壁部６３が下部周壁部１７に当接され、内側環状壁部６５が内筒部材７０に当接されている。 The partition wall 60 has one through hole 61 formed at a position eccentric from the central axis X of the housing 10 toward the peripheral wall portions (the upper peripheral wall portion 13 and the lower peripheral wall portion 17), and a second communication hole 79. Yes. The second communication hole 79 includes a plurality of through holes.
The partition wall 60 includes a flat portion 62, an outer annular wall portion 63 that extends from the outer peripheral edge of the flat portion 62 toward the top plate 12, and an outer annular surface portion 64 that protrudes radially outward from the outer annular wall portion 63. is doing. Further, the partition wall 60 has an inner annular wall portion 65 extended from the inner peripheral edge portion along the through hole 61 of the flat surface portion 62 toward the top plate 12 side. In the partition wall 60, the outer annular surface portion 64 is in contact with the annular step surface 19, the outer annular wall portion 63 is in contact with the lower peripheral wall portion 17, and the inner annular wall portion 65 is in contact with the inner cylindrical member 70.
　ハウジング１０内には、第１点火器４２を包囲して内筒部材７０が配置されている。内筒部材７０は、ハウジング１０と同じ材質からなるものが好ましい。内筒部材７０は、第１端開口部７１側が第１筒状壁部２２ａを包囲した状態で底板２０に当接され、第２端開口部７２側が隔壁６０の貫通孔６１を通って第１燃焼室４０側に位置するように配置されている。 An inner cylinder member 70 is disposed in the housing 10 so as to surround the first igniter 42. The inner cylinder member 70 is preferably made of the same material as the housing 10. The inner cylinder member 70 is in contact with the bottom plate 20 with the first end opening 71 side surrounding the first cylindrical wall portion 22a, and the second end opening 72 side passes through the through hole 61 of the partition wall 60 and is first. It arrange | positions so that it may be located in the combustion chamber 40 side.
　内筒部材７０は、底板２０側の第１端開口部７１、天板１２側の第２端開口部７２を有しており、第１端開口部７１にはフランジ部７１ａが形成され、第２端開口部７２には、半径方向の内側に突き出された内側環状部７３が形成されている。図１に示す内筒部材７０は、第１端開口部７１から第２端開口部７２に向かって外径が変化しており、第１端開口部７１側の大径部７４、第２端開口部７２側の小径部７６、大径部７４と小径部７６の間の傾斜面部７５からなっている。大径部７４は、第１筒状壁部２２ａに接触した状態で嵌め込まれており、フランジ部７１ａが第２底板部材３０の第１貫通孔３８の周縁部（周縁の第２平板部３１）を押さえつけている。小径部７６の先端部分は、内側環状壁部６５よりも上（第１燃焼室４０側）に突き出されている。 The inner cylinder member 70 has a first end opening 71 on the bottom plate 20 side and a second end opening 72 on the top plate 12 side. The first end opening 71 is formed with a flange portion 71a. The two-end opening 72 is formed with an inner annular portion 73 protruding inward in the radial direction. The inner cylinder member 70 shown in FIG. 1 has an outer diameter that changes from the first end opening 71 toward the second end opening 72, and has a large diameter portion 74 and a second end on the first end opening 71 side. It consists of a small diameter portion 76 on the opening 72 side, and an inclined surface portion 75 between the large diameter portion 74 and the small diameter portion 76. The large diameter portion 74 is fitted in contact with the first cylindrical wall portion 22a, and the flange portion 71a is the peripheral portion of the first through hole 38 of the second bottom plate member 30 (the peripheral second flat plate portion 31). Is holding down. The tip portion of the small diameter portion 76 protrudes above the inner annular wall portion 65 (on the first combustion chamber 40 side).
　内筒部材７０の内部は第１点火器４２の収容空間となっており、伝火薬を収容したときは、第１点火器４２を除いた残部空間が伝火薬室７８となっている。第２端開口部７２は、第１燃焼室４０側から内側環状部７３に貼り付けられたシールテープからなる第１閉塞部材６７により閉塞されており、作動時には伝火薬室７８と第１燃焼室４０を連通する第１連通孔になる。 The inside of the inner cylinder member 70 is a housing space for the first igniter 42, and when the transfer charge is stored, the remaining space excluding the first igniter 42 is a transfer charge chamber 78. The second end opening 72 is closed by a first closing member 67 made of a seal tape attached to the inner annular portion 73 from the first combustion chamber 40 side, and in operation, the transfer charge chamber 78 and the first combustion chamber. It becomes the 1st communicating hole which connects 40.
　複数の第２連通孔７９は、作動時に第２燃焼室５０と第１燃焼室４０を連通させるものである。図１では、第２点火器５２と軸方向に対向する位置および軸方向に対向していない位置のいずれにも第２連通孔７９が形成されているが、前記の軸方向に対向していない位置にのみ第２連通孔７９が形成されていてもよい。複数の第２連通孔７９は、金属製の粘着テープからなる第２閉塞部材７７で第１燃焼室４０側から閉塞されている。第２連通孔７９が第２点火器５２と軸方向に対向していない位置にのみ形成されていると、第２点火器５２の燃焼生成物によって第２閉塞部材７７が直接開裂することがなく、第２燃焼室５０の圧力を高められ、第２ガス発生剤５１全体の燃焼性が高くなるので好ましい。 The plurality of second communication holes 79 communicate the second combustion chamber 50 and the first combustion chamber 40 during operation. In FIG. 1, the second communication hole 79 is formed in both the position facing the second igniter 52 in the axial direction and the position not facing the axial direction, but it does not face the axial direction. The second communication hole 79 may be formed only at the position. The plurality of second communication holes 79 are closed from the first combustion chamber 40 side by a second closing member 77 made of a metal adhesive tape. If the second communication hole 79 is formed only at a position that does not face the second igniter 52 in the axial direction, the second closing member 77 is not directly cleaved by the combustion product of the second igniter 52. It is preferable because the pressure of the second combustion chamber 50 can be increased and the combustibility of the entire second gas generating agent 51 becomes high.
　図１の実施形態では、筒状フィルタ８０が配置されている。筒状フィルタ８０は、第１端面８１が天板１２に当接され、第２端面８２が隔壁６０の平面部６２に当接され、外側周面８３の下部（底板２０側）が外側環状壁部６３に当接されている。筒状フィルタ８０とガス排出口１４を有する上部周壁部１３の間には、筒状間隙が形成されている。 In the embodiment of FIG. 1, a cylindrical filter 80 is disposed. In the cylindrical filter 80, the first end surface 81 is in contact with the top plate 12, the second end surface 82 is in contact with the flat portion 62 of the partition wall 60, and the lower part (the bottom plate 20 side) of the outer peripheral surface 83 is the outer annular wall. It is in contact with the part 63. A cylindrical gap is formed between the cylindrical filter 80 and the upper peripheral wall portion 13 having the gas discharge port 14.
　図１に示すガス発生器１における第１点火器４２と第２点火器５２の樹脂による固定方法を説明する。 A method of fixing the first igniter 42 and the second igniter 52 with the resin in the gas generator 1 shown in FIG. 1 will be described.
　金型内において底板２０を有するクロージャシェル１６と第２底板部材３０を図２に示すように組み合わせて配置し、さらに第１点火器４２と第２点火器５２を配置する。その後、樹脂部９０を形成する溶融状態の熱可塑性樹脂を射出成形することで、クロージャシェル１６の底板２０の第１固定部２２に第１点火器４２が樹脂部９０で固定され、第２底板部材３０の第２固定部３２に第２点火器５２が樹脂部９０で固定され、さらにクロージャシェル１６と第２底板部材３０が樹脂部９０で固定されたものが得られる。 In the mold, the closure shell 16 having the bottom plate 20 and the second bottom plate member 30 are arranged in combination as shown in FIG. 2, and further, the first igniter 42 and the second igniter 52 are arranged. Thereafter, the molten thermoplastic resin forming the resin part 90 is injection-molded, whereby the first igniter 42 is fixed to the first fixing part 22 of the bottom plate 20 of the closure shell 16 by the resin part 90, and the second bottom plate The second igniter 52 is fixed to the second fixing portion 32 of the member 30 by the resin portion 90, and the closure shell 16 and the second bottom plate member 30 are fixed by the resin portion 90.
　図１のガス発生器１をエアバッグ装置に取り付けたときの動作を説明する。本発明のガス発生器１は、第１点火器４２が先に作動して、第２点火器５２が遅れて作動する形態だけでなく、第１点火器４２と第２点火器５２が同時に作動する場合や第１点火器４２のみが作動する場合においても効果があるものである。以下においては、第１点火器４２が先に作動する形態により説明する。 The operation when the gas generator 1 of FIG. 1 is attached to the airbag device will be described. In the gas generator 1 of the present invention, the first igniter 42 and the second igniter 52 are operated simultaneously as well as the first igniter 42 is operated first and the second igniter 52 is operated with a delay. This is effective even when the first igniter 42 is operated. In the following, the first igniter 42 will be described based on the first operation.
　第１点火器４２が先に作動したとき、第１点火器４２から生じた火炎などにより伝火薬室７８内の伝火薬が着火燃焼して、燃焼生成物を生じさせる。伝火薬室７８内に発生した燃焼生成物は、内筒部材７０の内側環状部７３の作用により集束されて直進して、第１閉塞部材６７を破り、第２端開口部７２と天板１２の間にある第１ガス発生剤４１を着火燃焼させたあと、天板１２に衝突する。第１ガス発生剤４１の燃焼により発生した燃焼ガスは、筒状フィルタ８０を通過したあと、シールテープを破ってガス排出口１４から排出されてエアバッグを膨張させる。第２点火器５２が作動すると第２ガス発生剤５１が着火燃焼され、燃焼ガスが発生する。発生した燃焼ガスは、第２閉塞部材７７を破って第２連通孔７９から第１燃焼室４０内に流入し、筒状フィルタ８０を通過してガス排出口１４から排出され、さらにエアバッグを膨張させる。 When the first igniter 42 is actuated first, the transfer charge in the transfer charge chamber 78 is ignited and burned by a flame generated from the first igniter 42, and a combustion product is generated. The combustion products generated in the charge transfer chamber 78 are converged by the action of the inner annular portion 73 of the inner cylinder member 70 and go straight, break the first closing member 67, and the second end opening 72 and the top plate 12. After the first gas generating agent 41 between the two is ignited and burned, it collides with the top plate 12. The combustion gas generated by the combustion of the first gas generating agent 41 passes through the cylindrical filter 80, then breaks the seal tape and is discharged from the gas discharge port 14 to inflate the airbag. When the second igniter 52 is operated, the second gas generating agent 51 is ignited and combusted to generate combustion gas. The generated combustion gas breaks through the second closing member 77 and flows into the first combustion chamber 40 from the second communication hole 79, passes through the cylindrical filter 80, and is discharged from the gas discharge port 14, and further passes through the air bag. Inflate.
　このような動作過程において、第１ガス発生剤４１の燃焼時に、ハウジング１０内部の圧力が上昇したとき、天板１２側と伝火薬室７８を経由して底板２０側に大きな圧力が加えられ、天板１２と底板２０はそれぞれが軸Ｘ方向の外側に変形する。しかし、ガス発生器１は、底板２０の上にさらに第２底板部材３０が当接配置されて補強されていること、底板２０と第２底板部材３０のそれぞれが樹脂部９０と強く結合されていることから、底板２０は軸Ｘ方向外側への変形が抑制されている。このため、第１点火器４２が作動したときの圧力上昇によって、第２点火器５２に接続されたコネクタが緩んだり、脱落したりすることが防止されている。 In such an operation process, when the pressure inside the housing 10 is increased during the combustion of the first gas generating agent 41, a large pressure is applied to the bottom plate 20 side via the top plate 12 side and the charge transfer chamber 78, Each of the top plate 12 and the bottom plate 20 is deformed outward in the axis X direction. However, in the gas generator 1, the second bottom plate member 30 is further disposed on the bottom plate 20 to be reinforced, and each of the bottom plate 20 and the second bottom plate member 30 is strongly coupled to the resin portion 90. Therefore, the bottom plate 20 is prevented from being deformed outward in the X direction. For this reason, it is prevented that the connector connected to the second igniter 52 is loosened or dropped due to the pressure increase when the first igniter 42 is operated.
　なお本発明技術をデュアルタイプのガス発生器に応用した例として、図１のように隔壁６０で燃焼室が上下に分けられたガス発生器を示したが、本発明では燃焼室の配置等について限定するものではない。例えば隔壁６０や筒状フィルタ８０の形状と配置を変更し、第１燃焼室が底板２０側に形成されているもの、およびUS 6,032,979で示されるような第１燃焼室が第２燃焼室を取り囲んでいるような構造においても、本発明技術を適用することが出来る。 As an example in which the technology of the present invention is applied to a dual type gas generator, a gas generator in which a combustion chamber is divided vertically by a partition wall 60 as shown in FIG. 1 is shown. It is not limited. For example, the shape and arrangement of the partition wall 60 and the cylindrical filter 80 are changed so that the first combustion chamber is formed on the bottom plate 20 side and the first combustion chamber as shown in US Pat. No. 6,032,979 surrounds the second combustion chamber. Even in such a structure, the technology of the present invention can be applied.
本発明を以上のように記載した。当然、本発明は様々な形の変形をその範囲に含み、これら変形は本発明の範囲からの逸脱ではない。また当該技術分野における通常の知識を有する者が明らかに本発明の変形とみなすであろうすべては、以下に記載する請求項の範囲にある。 The invention has been described above. Of course, the present invention includes within its scope various modifications, which do not depart from the scope of the present invention. Also, all that would be considered obvious variations of the present invention by those having ordinary skill in the art are within the scope of the claims set forth below.

Claims (4)

  1. 　天板と、前記天板と軸方向に対向する位置にある底板と、前記天板と前記底板の間にあるガス排出口が形成された周壁部からなるハウジングを有しており、
    　前記底板が、平板部と、前記平板部にそれぞれ分離して形成された、第１点火器を固定するための第１穴部と、第２点火器を取り付けるための第２穴部を有しており、
    　さらに前記底板の上に当接されて配置された第２底板部材を有しており、
    　前記第２底板部材が第２平板部と二つの貫通孔を有しており、前記二つの貫通孔が、前記底板の第１穴部と第２穴部に対して軸方向に対向する位置に形成された第１貫通孔と第２貫通孔であり、
    　前記第１点火器が、第１穴部と第１貫通孔の両方に通されて配置され、樹脂を介して前記第１穴部周縁の平板部と前記第１貫通孔周縁の第２平板部に対して固定されているものであり、
    　前記第２点火器が、第２穴部と第２貫通孔の両方に通されて配置され、樹脂を介して前記第２穴部周縁の平板部と前記第２貫通孔周縁の第２平板部に対して固定されているものである、ガス発生器。     A housing comprising a top plate, a bottom plate in a position facing the top plate in the axial direction, and a peripheral wall portion formed with a gas discharge port between the top plate and the bottom plate;
    The bottom plate has a flat plate portion, a first hole portion for fixing the first igniter formed separately from the flat plate portion, and a second hole portion for attaching the second igniter. And
    Furthermore, it has a second bottom plate member arranged in contact with the bottom plate,
    The second bottom plate member has a second flat plate portion and two through-holes, and the two through-holes are at positions that face the first hole portion and the second hole portion of the bottom plate in the axial direction. A first through hole and a second through hole formed,
    The first igniter is disposed through both the first hole portion and the first through hole, and a flat plate portion around the first hole portion and a second flat plate portion around the first through hole via resin. Is fixed against
    The second igniter is disposed through both the second hole portion and the second through hole, and a flat plate portion around the second hole portion and a second flat plate portion around the second through hole via resin. A gas generator that is fixed against.
  2. 　前記底板の平板部に形成された第１穴部が、第１点火器を固定するための第１固定部となる、前記第１穴部周縁の平板部から前記第１貫通孔の内側を通って天板方向に伸ばされた第１筒状壁部と、前記第１筒状壁部から半径方向内側に伸ばされた第１環状面部を有しており、前記第１点火器が樹脂を介して前記第１固定部に固定されているものであり、
    　前記第２底板部材の第２貫通孔が、第２点火器を固定するための第２固定部となる、前記第２貫通孔周縁の平板部から天板方向に伸ばされた第２筒状壁部と、前記第２筒状壁部から半径方向内側に伸ばされた第２環状面部を有しており、前記第２点火器が樹脂を介して前記第２固定部に固定されているものである、請求項１記載のガス発生器。     A first hole formed in the flat plate portion of the bottom plate serves as a first fixing portion for fixing the first igniter, and passes through the inside of the first through hole from the flat plate portion around the periphery of the first hole portion. And a first annular wall portion extending radially inward from the first cylindrical wall portion, and the first igniter is interposed via a resin. Are fixed to the first fixing part,
    The 2nd cylindrical wall extended in the top plate direction from the flat plate part of the circumference of the 2nd above-mentioned penetration hole in which the 2nd penetration hole of the above-mentioned 2nd bottom board member serves as the 2nd fixation part for fixing the 2nd igniter And a second annular surface portion extending radially inward from the second cylindrical wall portion, and the second igniter is fixed to the second fixing portion via a resin. The gas generator according to claim 1.
  3. 　前記第１環状面部が、前記天板側の面と前記底板側の面の少なくとも一方の面に第１環状溝を有しており、前記第１環状溝内にも樹脂が入り込んでいるものであり、
    　前記第２環状面部が、前記天板側の面と前記底板側の面の少なくとも一方の面に第２環状溝を有しており、前記第２環状溝内にも樹脂が入り込んでいるものであり、
    　前記底板の第２穴部周縁の平板部が、前記第２筒状壁部の軸方向の形成位置よりも半径方向内側に伸ばされ、前記第２穴部周縁の平板部の内側面と外側面の少なくとも一方の面に底板環状溝を有しているものである、請求項２記載のガス発生器。     The first annular surface portion has a first annular groove on at least one of the surface on the top plate side and the surface on the bottom plate side, and resin enters the first annular groove. Yes,
    The second annular surface portion has a second annular groove on at least one surface of the top plate side surface and the bottom plate side surface, and resin enters the second annular groove. Yes,
    The flat plate portion at the periphery of the second hole portion of the bottom plate is extended radially inward from the axial formation position of the second cylindrical wall portion, and the inner surface and the outer surface of the flat plate portion at the periphery of the second hole portion. The gas generator according to claim 2, which has a bottom plate annular groove on at least one surface thereof.
  4. 　前記第２底板部材が、前記第１貫通孔と前記第２貫通孔が形成された第２平板部と、前記第２平板部の外周縁部において前記天板側に伸ばされた外側環状壁部を有しており、
    　前記第２平板部と前記外側環状壁部の境界部が前記底板と前記周壁部の境界部に当接され、前記外側環状壁部が前記周壁部に当接されているものである、請求項１～３のいずれか１項記載のガス発生器。     The second bottom plate member includes a second flat plate portion in which the first through hole and the second through hole are formed, and an outer annular wall portion extended toward the top plate side at an outer peripheral edge portion of the second flat plate portion. Have
    The boundary portion between the second flat plate portion and the outer annular wall portion is in contact with the boundary portion between the bottom plate and the peripheral wall portion, and the outer annular wall portion is in contact with the peripheral wall portion. The gas generator according to any one of 1 to 3.
PCT/JP2017/037318 2016-11-11 2017-10-16 Gas generator WO2018088133A1 (en)

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