EP1696200A1 - Zünder - Google Patents

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Publication number
EP1696200A1
EP1696200A1 EP06003632A EP06003632A EP1696200A1 EP 1696200 A1 EP1696200 A1 EP 1696200A1 EP 06003632 A EP06003632 A EP 06003632A EP 06003632 A EP06003632 A EP 06003632A EP 1696200 A1 EP1696200 A1 EP 1696200A1
Authority
EP
European Patent Office
Prior art keywords
resin
igniter
cylindrical wall
main body
collar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06003632A
Other languages
English (en)
French (fr)
Inventor
Takao Kuroda
Shingo Oda
Shigeaki Yano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daicel Corp
Original Assignee
Daicel Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daicel Chemical Industries Ltd filed Critical Daicel Chemical Industries Ltd
Publication of EP1696200A1 publication Critical patent/EP1696200A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/195—Manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/103—Mounting initiator heads in initiators; Sealing-plugs

Definitions

  • the present invention relates to an igniter assembly which can be used in a gas generator for an air bag.
  • An igniter assembly having a structure in which an igniter main body and a collar for supporting the igniter main body are integrated using resin is advantageous in that the manufacturing process thereof can be simplified.
  • the molten resin may shrink upon hardening, creating gaps between the resin and the igniter main body or collar. This shrinkage can be suppressed by selecting an appropriate resin, but cannot be prevented completely.
  • An igniter assembly is applied to a passenger restraining device such as a gas generator for an air bag, and in order to prevent moisture infiltration, the gas generator should be sealed completely the interior thereof from the exterior. However, when gaps such as those described above occur between the igniter main body and the resin, or between the collar and the resin, moisture may infiltrate from the outside.
  • An aspect of the present invention relates to an igniter assembly including an igniter collar having at least a cylindrical wall and an annular protruding portion protruding inward from a part of the cylindrical wall and an igniter main body, the igniter main body being accommodated in the igniter collar and fixed within the igniter collar with a resin, the resin being charged so as to extend from a position sandwiching the annular protruding portion from the upper and lower directions up to the same height as the upper end of the cylindrical wall, but not to cover an outer peripheral wall of the cylindrical wall.
  • the molten resin shrinks toward the inside, but when the inner and outer walls on the upper portion of the collar are both covered with the resin, as described in US-B No. 5,533,754, US-B No. 5,584,505, and JP-A No. 2003-161599, the resin covering the outer wall acts to obstruct shrinkage of the resin toward the inside of the collar, and as a result, gaps become more likely to occur between the igniter main body and the resin.
  • the present invention further relates to an igniter assembly which is suitable for use in a gas generator for an air bag, and which has a structure that prevents gaps from occurring between a collar and a resin, and between an igniter main body and the resin, even when the molten resin hardens during assembly.
  • the igniter collar When the molten resin charged into the igniter collar hardens, shrinkage occurs in a central direction. At this time, the igniter collar is positioned further outward than the igniter main body, and hence, if no restrictions are provided, the resin shrinks so as to separate from the igniter collar, enabling gaps to form between the igniter collar and the hardened resin.
  • the cylindrical wall does not affect the resin shrinking in the central direction, and hence the formation of gaps between the igniter collar and the hardened resin is suppressed.
  • the annular protruding portion can be sandwiched tightly by the resin from the upper and lower directions thereof, using the shrinkage force of the resin, and hence even if gaps are formed between the cylindrical wall and the resin, sealing is exhibited at the annular protruding portion, preventing the infiltration of moisture and so on.
  • the outer peripheral wall of the igniter collar is not covered by the resin.
  • the resin covers the outside of the igniter collar, as in US-B No. 5,533,754, US-B No. 5,584,505, and JP-A No. 2003-161599, the central direction-shrinkage force of the resin, generated during hardening and shrinkage, acts on the outer peripheral wall, causing the resin covering the igniter main body to shrink in the opposite direction, i.e. outward. As a result, gaps become more likely to form between the igniter main body and resin.
  • the present invention further relates to the igniter assembly, wherein the resin is charged so as to extend from the position sandwiching the annular protruding portion from the upper and lower directions up to a height covering an upper end edge of the cylindrical wall, but does not cover the outer peripheral wall of the cylindrical wall.
  • the contact surface area between the igniter main body and the resin is increased, and hence the binding strength of the igniter main body and resin is increased.
  • the present invention further relates to the igniter assembly, wherein the resin is charged so as to extend from the position sandwiching the annular protruding portion from the upper and lower directions up to a height covering an upper end edge of the cylindrical wall, and also so as to protrude outward, but does not cover the outer peripheral surface of the cylindrical wall.
  • the contact surface area between the igniter main body and the resin is increased, and hence the binding strength of the igniter main body and resin is increased.
  • the resin to protrude outward when the igniter assembly is disposed in an igniter accommodation space of a gas generator, the igniter accommodation space contacts the protruding portion of the resin, thereby generating friction which prevents the igniter assembly from rotating.
  • the present invention further relates to the igniter assembly, wherein the igniter main body includes a header portion, a conductive pin extending from the header portion, and a cup portion covering the header portion and filled with an ignition charge therein, and at least half the entire height of the cup portion of the igniter main body is enveloped by the cylindrical wall of the igniter collar.
  • the igniter assembly When the igniter assembly is activated, the ignition charge burns, causing the cup portion to expand outward. At this time, it is conceivable for the resin on the outside of the cup portion also to deform, but since the cylindrical wall of the igniter collar exists on the outer periphery of the resin, deformation of the resin is suppressed, and the formation of gaps between the igniter main body and resin is suppressed.
  • the present invention further relates to the igniter assembly, wherein an upper end opening portion peripheral edge of the cylindrical wall is formed so as to incline inward.
  • the present invention further relates to the igniter assembly, wherein a part of an inner peripheral surface of the cylindrical wall which contacts the resin has irregularities such as unevenness or a projection(s).
  • the irregular portions engage with the resin, and hence the hardened resin can be prevented from rotating inside the igniter collar.
  • the igniter assembly of the present invention In the igniter assembly of the present invention, axially penetrating gaps do not occur between the igniter collar and resin, and between the igniter main body and resin, even when the resin shrinks during the hardening process. Hence, when the igniter assembly is incorporated into a gas generator, external moisture does not pass through the igniter assembly to infiltrate the interior of the gas generator.
  • the igniter assembly shown in Fig. 1 is a longitudinal sectional view of an igniter assembly.
  • An igniter collar 11 is a metallic, substantially cylindrical component including a cylindrical wall 12, and an annular protruding portion 13 protruding inward from a part of the cylindrical wall 12.
  • An inner peripheral surface 16 extending from an upper end edge 14 of the cylindrical wall 12 to the annular protruding portion 13 is curved.
  • a plurality of uneven surfaces or projections may be provided on the inner peripheral surface 16 to prevent a resin 30 from rotating within the igniter collar 11.
  • the irregularities may be provided over the entire inner peripheral surface 16, or at equal intervals.
  • the irregularities may be provided continuously or non-continuously in either the axial direction or the circumferential direction on the inner peripheral surface from the upper end edge 14 to the annular protruding portion 13.
  • An igniter main body 20 includes a header portion 21, two conductive pins 22, 23 extending from the header portion 21, and a cup portion 25 covering the header portion 21, the interior of which is charged with an ignition charge 24.
  • a cylindrical sleeve 26 is disposed in the cup portion 25.
  • a heat generating body is disposed in the header portion 21.
  • the igniter main body 20 is fixed inside the igniter collar 11 by the resin 30.
  • the resin 30 extends from a position sandwiching the annular protruding portion 13 from the upper and lower directions to the same height as (flush with) the upper end edge 14 of the cylindrical wall 12. However, the resin 30 does not cover an outer peripheral surface 15 of the cylindrical wall 12.
  • the conductive pins 22, 23 are covered with resin except for the tip end portions thereof, which are connected to a connector (i.e. fitted into a connector accommodating space 28).
  • At least half the entire height H of the cup portion 25 of the igniter main body 20 is enveloped by the resin 30, and the periphery of the resin 30 is enveloped by the cylindrical wall 12. If the cylindrical wall 12 is not provided, the resin 30 on the outside of the cup portion 25 deforms outwardly as the cup portion 25 expands outward upon combustion of the ignition charge 24 when the igniter assembly 10 is activated, but since the cylindrical wall 12 of the igniter collar 11 exists on the outer periphery of the resin 30, deformation of the resin 30 is suppressed, and hence gaps are unlikely to form between the igniter main body 20 and resin 30.
  • holes defined by the annular protruding portion 13 are set to be smaller than the diameter of the cup portion 25 of the igniter main body 20, and hence even in situations where the resin 30 deforms greatly upon activation of the igniter assembly 10, the igniter main body 20 does not fall downward from the igniter collar 11.
  • molten resin is charged using an injection molding method or the like to obtain the state shown in the drawing, whereupon hardening of the resin progresses.
  • the resin 30 shrinks in a central direction.
  • the annular protruding portion 13 is sandwiched by the resin 30 from the upper and lower directions in Fig. 1 (the thickness direction).
  • the formation of gaps between the annular protruding portion 13 and the hardened resin 30 can be suppressed, and the shrinkage force of the resin 30 can be used to sandwich the annular protruding portion 13 tightly with the resin 30 from the upper and lower directions.
  • the cylindrical wall 12 exists on the outside of the resin 30, and hence gaps are likely to form between the inner peripheral surface 16 of the cylindrical wall 12 and the resin 30 during the hardening process.
  • the annular protruding portion 13 and resin 30 are attached tightly to each other, and hence when the igniter assembly 10 is attached to a gas generator, gaps which penetrate the interior of the gas generator from the connector accommodation space 28 do not form.
  • the resin 30 does not cover the outer peripheral surface 15 of the cylindrical wall 12, and hence shrinkage of the resin 30 occurs toward the igniter main body 20 during the hardening process. As a result, gaps do not form between the igniter main body 20 and resin 30.
  • Resin having a mold shrinkage rate of not more than 1% is preferably employed as the resin of the present invention, and resin having a mold shrinkage rate between 0.1 and 0.8% is particularly preferable.
  • the mold shrinkage rate is not more than 1%, the hardened resin does not deform, warp or have any rough surface or asperities, and as a result, penetrating gaps can be prevented from forming between the igniter main body 20 and the resin 30, or between the igniter collar 11 and the resin 30.
  • the mold shrinkage rate is not less than 0.1%, the annular protruding portion 13 can be sandwiched more securely as a result of the mold shrinkage in the resin, which is preferable.
  • the employed resin preferably has a mold shrinkage rate (in the flow direction and perpendicular direction) that is at least sufficient to prevent undesirable gaps from forming between the igniter main body 20 and resin 30, between the igniter collar 11 and resin 30, and so on.
  • thermosetting resin may be used as the resin, but in consideration of the injection molding process, it is preferable for such a resin to be thermoplastic, and even more preferable for the resin to be combined with glass fiber or another inorganic filling material.
  • the water absorption of the resin after submersion for 24 hours at 23°C is preferably between 0.005 and 0.5%, and more preferably between 0.005 and 0.3%.
  • the tensile strength of the resin is preferably between 70 and 250MPa, more preferably between 100 and 250MPa, and even more preferably between 170 and 250MPa.
  • the employed resin preferably has a linear expansion coefficient of not more than 8 ⁇ 10 -5 /°C, a tensile strength of not less than 100MPa, and a dielectric breakdown voltage of not less than 10MV/m.
  • Such a resin examples include nylon 6-12, polyallylate, polybutylene terephthalate, polyphenylene sulphide, and liquid crystal polymer. These resins may be combined with an inorganic filling material such as glass fiber, glass filler, or a mineral. Polybutylene terephthalate containing 20 to 80% by mass of glass fiber, polyphenylene sulphide containing 20 to 80% by mass of glass fiber, and liquid crystal polymer containing 20 to 80% by mass of mineral are particularly preferable.
  • the orientation of the glass fiber is preferably adjusted so as to be aligned with the extension direction of the conductive pins inserted into the resin. In so doing, the mold shrinkage rate increases in the thickness direction of the conductive pins 22, 23, and moisture permeation between the conductive pins 22, 23 and resin 30 can be prevented reliably.
  • the inorganic filling material content in each of the resin materials is preferably between 20 and 50% by mass.
  • nylon 6-12 containing 33% by mass of glass fiber (and having a mold shrinkage rate in the flow direction of 0.2%, a mold shrinkage rate in the perpendicular direction of 0.3%, and a linear expansion coefficient of 2.3 ⁇ 10 -5 /°C) may be used.
  • this type of resin is used, a favorable mold shrinkage rate for sandwiching the annular protruding portion 13 from the upper and lower directions can be exhibited, and deformation, warping, and so on after molding can be suppressed.
  • the igniter assembly shown in Fig. 2 is a longitudinal sectional view of an igniter assembly.
  • An igniter assembly 100 shown in Fig. 2 is substantially identical in structure to the igniter assembly 10 of Fig. 1, and therefore only different portion will be described. Note that identical reference numerals to those of Fig. 1 denote identical components in Fig. 2.
  • the resin 30 extends from a position sandwiching the annular protruding portion 13 from the upper and lower directions to the portion above the upper end edge 14 of the cylindrical wall 12, but the outer peripheral surface 15 of the cylindrical wall 12 is not covered by the resin 30. At least half the entire height H of the cup portion 25 of the igniter main body 20 (the top of the upper end edge 14 is covered with the resin 30, and therefore the part of the cup portion 25 that is enveloped by the resin 30 increases proportionately in comparison with Fig. 1) is enveloped by the resin 30, while the periphery of the resin 30 is enveloped by the cylindrical wall 12.
  • the igniter assembly shown in Fig. 3 is a longitudinal sectional view of an igniter assembly.
  • An igniter assembly 200 shown in Fig. 3 is substantially identical in structure to the igniter assembly 10 of Fig. 1, and therefore only different portion will be described. Note that identical reference numerals to those of Fig. 1 denote identical components in Fig. 3.
  • the cylindrical wall 12 of the igniter collar 11 is formed such that the upper end edge 14 is inwardly inclined.
  • the resin 30 extends from a position sandwiching the annular protruding portion 13 from the upper and lower directions to the portion above the upper end edge 14 of the cylindrical wall 12, but the outer peripheral surface 15 of the cylindrical wall 12 is not covered by the resin 30.
  • At least half the entire height H of the cup portion 25 of the igniter main body 20 (the top of the upper end edge 14 is covered with the resin 30, and therefore the part of the cup portion 25 that is enveloped by the resin 30 increases proportionately in comparison with Fig. 1) is enveloped by the resin 30, while the periphery of the resin 30 is enveloped by the cylindrical wall 12.
  • the igniter assembly shown in Fig. 4 is a longitudinal sectional view of an igniter assembly.
  • An igniter assembly 300 shown in Fig. 4 is substantially identical in structure to the igniter assembly 10 of Fig. 1, and therefore only different portion will be described. Note that identical reference numerals to those of Fig. 1 denote identical components in Fig. 4.
  • the cylindrical wall 12 of the igniter collar 11 is formed such that the upper end edge 14 is inwardly inclined.
  • the resin 30 extends from a position sandwiching the annular protruding portion 13 from the upper and lower directions to the portion above the upper end edge 14 of the cylindrical wall 12, and also protrudes outward to form an annular protruding portion 31.
  • the outer peripheral surface 15 of the cylindrical wall 12 is not covered by the resin 30.
  • the protruding portion 31 may be a plurality of independent protrusions rather than being annular.
  • the annular protruding portion 31 contacts the inner surface of the igniter accommodation space when the igniter assembly 10 is mounted in the igniter accommodation space of a gas generator, thereby generating friction which prevents the igniter assembly 10 from rotating.
  • At least half the entire height H of the cup portion 25 of the igniter main body 20 (the top of the upper end edge 14 is covered with the resin 30, and therefore the part of the cup portion 25 that is enveloped by the resin 30 increases proportionately in comparison with Fig. 1) is enveloped by the resin 30, while the periphery of the resin 30 is enveloped by the cylindrical wall 12.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Air Bags (AREA)
EP06003632A 2005-02-28 2006-02-22 Zünder Withdrawn EP1696200A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005053862A JP4452635B2 (ja) 2005-02-28 2005-02-28 点火器組立体

Publications (1)

Publication Number Publication Date
EP1696200A1 true EP1696200A1 (de) 2006-08-30

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ID=36019474

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EP06003632A Withdrawn EP1696200A1 (de) 2005-02-28 2006-02-22 Zünder

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JP (1) JP4452635B2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5160768B2 (ja) * 2006-11-15 2013-03-13 Ｎｔｎ株式会社 磁気エンコーダおよび転がり軸受
JP4817191B2 (ja) * 2007-05-23 2011-11-16 日本化薬株式会社 ガス発生器
JP5245178B2 (ja) * 2009-05-28 2013-07-24 日本化薬株式会社 点火器組立体およびこれを備えたガス発生器
JP2018122851A (ja) * 2017-02-02 2018-08-09 日本化薬株式会社 ガス発生器
JP7428585B2 (ja) 2020-05-14 2024-02-06 株式会社ダイセル 点火器組立体及びそれを備えるガス発生器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5533754A (en) 1995-05-31 1996-07-09 Trw Vehicle Safety Systems Inc. Air bag inflator
US5584505A (en) 1993-08-20 1996-12-17 Trw Inc. Inflator assembly
EP1217325A1 (de) * 1999-09-27 2002-06-26 Daicel Chemical Industries, Ltd. Anzünder
JP2003161599A (ja) 2001-11-21 2003-06-06 Daicel Chem Ind Ltd イニシエータ組立体
US20040043652A1 (en) * 2002-08-30 2004-03-04 Special Devices, Inc. Initiator having integral features for orienting and holding an insertable electrical shunt
US20040251667A1 (en) * 2003-03-26 2004-12-16 Hiroshi Harada Ignitor assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5584505A (en) 1993-08-20 1996-12-17 Trw Inc. Inflator assembly
US5533754A (en) 1995-05-31 1996-07-09 Trw Vehicle Safety Systems Inc. Air bag inflator
EP1217325A1 (de) * 1999-09-27 2002-06-26 Daicel Chemical Industries, Ltd. Anzünder
JP2003161599A (ja) 2001-11-21 2003-06-06 Daicel Chem Ind Ltd イニシエータ組立体
US20040043652A1 (en) * 2002-08-30 2004-03-04 Special Devices, Inc. Initiator having integral features for orienting and holding an insertable electrical shunt
US20040251667A1 (en) * 2003-03-26 2004-12-16 Hiroshi Harada Ignitor assembly

Also Published As

Publication number Publication date
JP4452635B2 (ja) 2010-04-21
JP2006234369A (ja) 2006-09-07

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