EP1160534B1 - Allumeur pour système de sécurité - Google Patents

Allumeur pour système de sécurité Download PDF

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Publication number
EP1160534B1
EP1160534B1 EP01109481A EP01109481A EP1160534B1 EP 1160534 B1 EP1160534 B1 EP 1160534B1 EP 01109481 A EP01109481 A EP 01109481A EP 01109481 A EP01109481 A EP 01109481A EP 1160534 B1 EP1160534 B1 EP 1160534B1
Authority
EP
European Patent Office
Prior art keywords
ferrite core
pressure
housing
encapsulated
protective layer
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.)
Expired - Lifetime
Application number
EP01109481A
Other languages
German (de)
English (en)
Other versions
EP1160534A3 (fr
EP1160534A2 (fr
Inventor
Günther Schmid
Martin Schmid
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.)
Hirschmann Automotive GmbH
Original Assignee
Hirschmann Automotive GmbH
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 Hirschmann Automotive GmbH filed Critical Hirschmann Automotive GmbH
Publication of EP1160534A2 publication Critical patent/EP1160534A2/fr
Publication of EP1160534A3 publication Critical patent/EP1160534A3/fr
Application granted granted Critical
Publication of EP1160534B1 publication Critical patent/EP1160534B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F42B3/188—Safety initiators resistant to premature firing by static electricity or stray currents having radio-frequency filters, e.g. containing ferrite cores or inductances

Definitions

  • the invention relates to an ignition device for a safety system, which is in particular an airbag or a belt tensioner of a vehicle, according to the features of the preamble of claim 1.
  • a drive device for restraint systems in motor vehicles consists of a housing with a cylinder in which a piston is movably arranged.
  • the piston is pushed out of the cylinder when a working chamber of the housing has been pressurized by igniting a propellant filled with gas.
  • the propellant charge is arranged in a partial region of the housing and is separated from the working chamber by a so-called bursting floor.
  • Within the propellant charge there is a priming charge which, when the primer has been ignited, causes the propellant charge to explode.
  • the propellant charge in which the ignition charge is inserted, is housed in a portion of the housing and is separated by a spacer sleeve of this portion of the housing.
  • the ignition charge is connected by very thin leads to a control device.
  • the portion of the housing in which the propellant charge is arranged is closed by a cap.
  • the means for EMC protection are formed as a ferrite core, wherein the ferrite core is arranged closely adjacent to the ignition element.
  • the external electrical influences such as, for example, high-frequency influences
  • the formation of the means for EMC protection as a ferrite core is therefore appropriate because this ferrite core (or more) can be pushed over the leads.
  • the ferrite core is arranged concentrically on the connection means, for example, whereby it is possible to place it in the region of the connection lines or in the contact region of the connection lines with the contact lugs of the ignition element.
  • Such a configuration is known from WO 94/10 528 A
  • the invention is therefore an object of the invention to provide an ignition device, which is equipped with an EMC protection optimally prevents misfiring the igniter and is easy to produce.
  • the ferrite core is encapsulated pressure insensitive.
  • Such ferrite cores are produced in a manner known per se by means of the pressing process or spraying process and then finished by means of a suitable sintering process.
  • Such sintered materials are generally very sensitive to mechanical external influences such as pressure, impact or the like. If cracks occur in the ferrite core due to such mechanical influences or if parts of the ferrite core break off, the original effect immediately changes due to a changing permeability of the ferrite core. Such a change would result in reduced EMC protection.
  • the invention provides that the ferrite core is encapsulated pressure insensitive, ie, has such an encapsulation that it is effectively protected from external mechanical influences such as pressure, impact or the like.
  • the achieved EMC protection is always maintained and the values (such as permeability) of the ferrite core can no longer change.
  • This encapsulation also has the advantage that the ferrite core in itself prior to its installation in the ignition device z. B. during transport, storage or the like is effectively protected. After installation, it makes sense to use a portion of the ignition element (the area of the leads or the terminal lugs of the Ignition element) including the plugged on the leads ferrite core pressure-sensitive to encapsulate.
  • the ferrite core be encapsulated in a pot-like housing insensitive to pressure.
  • This cup-shaped housing which corresponds inside the outer dimensions of the ferrite core, is slipped over the ferrite core, so that it is encapsulated. Any remaining spaces between housing and ferrite core can be filled with suitable means.
  • the ferrite core is encapsulated with at least two shells, in particular two half-shells, insensitive to pressure. These two shells (or more shells) surround the ferrite core so completely that it is protected against external influences. Again, a remaining gap can be filled with suitable means, especially if the at least two shells are glued together. Alternatively, a Verklipsen the at least two shells is conceivable.
  • the pot-like housing or the at least two shells can be thought to protect the ferrite core so before mounting on the connection means from external influences.
  • D. h. That the ferrite core is encapsulated in a suitable manner insensitive to pressure and after the encapsulation is pushed onto the leads.
  • the ferrite core is at least partially, in particular in its entirety, surrounded in a low-pressure process with a protective layer, wherein the protective layer causes the pressure-insensitive encapsulation.
  • An encapsulation in the low-pressure process is therefore necessary because damage to the ferrite core is avoided with this low-pressure process.
  • the pressure in the low-pressure process must be adapted to the ferrite core (material, geometry) accordingly.
  • the surrounding of the ferrite core with a protective layer also has the advantage that the entire unit ignition element / component for EMC protection is particularly compact builds and is mechanically stabilized. This has just with an automatic assembly has the advantage that z. B. during transport or at Storage of the pre-assembled assembly Ignition element / ferrite core damage can be avoided.
  • the pressure-insensitive encapsulated ferrite core is encapsulated in a high-pressure process with a further protective layer, wherein the further protective layer at least partially forms the housing of the ignition device in a particularly advantageous manner.
  • the pressure-insensitive encapsulation of the ferrite core results in the already described advantages.
  • the ferrite core can only be encapsulated in the high-pressure process due to its pressure-insensitive encapsulation since, without encapsulation, the pressure would already be sufficient to damage or even destroy the ferrite core.
  • the enclosure does not necessarily have to have the outer shape of the housing of the ignition device.
  • the invention provides that the pressure-insensitive encapsulated ferrite core is again surrounded by its ignition element from a housing, this being produced in an advantageous manner in the high-pressure process.
  • the invention thus has the advantage that the ignition device is effectively protected against EMC influences and thus misfires are avoided, the production of such a device can be realized in a simple manner and, above all, automatable.
  • FIG. 1 shows an ignition device 1, which can be produced as a preassembled unit.
  • This ignition device 1 is installed as a unit at the corresponding location of the safety system of the airbag or the belt tensioner or the like in the vehicle.
  • the ignition device 1 comprises an ignition element 2, which can be acted upon with an electrical pulse to bring a propellant charge (not shown here) of the safety system to explode.
  • a propellant charge not shown here
  • the ignition element 2 is seated on an end face of an ignition housing 3, with which the ignition device 1 can be installed in a likewise not shown housing of the safety system.
  • Connecting lines 4 and 5, through which the ignition element 2 receives its electrical impulse, are led out of this at the opposite end face of the ignition housing 3, but can also be led out of this ignition housing 3 at any other point and be designed as contact lugs, pins or the like .
  • In the ignition housing 3 means (not shown in Figure 1) are provided for EMC protection, which are formed as a ferrite core and are arranged adjacent to the ignition element 2 closely.
  • FIG. 2 shows the exemplary embodiment of the ignition element 2, which consists of a head with the ignition charge and contact lugs 6 and 7 for the electrical contact.
  • the contact lugs 6 and 7 are connected to the leads 4 and 5, and it is also conceivable that the ignition element 2 has no contact lugs 6 and 7, but that the electrical leads 4 and 5 are led out directly from the ignition element 2.
  • FIGS. 1-10 Various possibilities of pressure-insensitive encapsulations of a ferrite core 8 are shown in FIGS.
  • the ferrite core 8 has passages (holes) through which the leads 4 and 5 (or the contact lugs 6 and 7) are performed. It is conceivable that a ferrite core has both leads, and it is also conceivable that each lead own ferrite core 8 is present.
  • FIG. 3 the already finished encapsulation of the ferrite core 8 is shown, wherein the ferrite core 8 is first pushed onto the leads 4 and 5 and then a cup-shaped housing 9 is placed over the ferrite core 8.
  • the pot-like housing 9 also has bushings for the leads 4 and 5.
  • the ferrite core 8 After being encapsulated insensitive to pressure in this way, the ferrite core 8, it is surrounded by a further protective layer 10, which is in particular encapsulated in the high pressure process.
  • the further protective layer 10 is at least partially part of the housing 3 or it forms the protective layer 10, the entire housing 3.
  • the pot-like housing 9 should be mentioned that the open side of the housing 9 with a lid, through which then also the leads 4 and 5 are performed, can be closed.
  • FIG. 4 shows that the pressure-insensitive encapsulation of the ferrite core 8 consists of two half-shells 11 and 12. These shells 11 and 12 allow the implementation of the leads 4 and 5.
  • FIG. 5 shows that the ferrite core 8 is surrounded by a protective layer 13, this protective layer 13 being produced by the low-pressure method. It is conceivable that the ferrite core 8 is first surrounded with the protective layer 13 and then the connecting lines 4 and 5 are pushed through the ferrite core 8. Alternatively, it is conceivable that the ferrite core 8 (or in each case a ferrite core) is pushed over the leads 4 and 5 and then the protective layer 13 is produced in the low-pressure process. This alternative causes the ferrite core 8 to be fixed in position.
  • the ferrite core shown in Figures 3 to 5 is arranged according to the invention in the vicinity of the head of the ignition element 2, wherein the pressure-insensitive encapsulation may also include parts of the ignition element 2 with.
  • FIG. 6 shows a further embodiment of an ignition device, wherein like elements are provided with the same reference numerals as in the preceding figures.
  • the reference numeral 14 is still a plug or the like referred to, via which the ignition device is connected to an unillustrated control unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (6)

  1. Dispositif d'amorce (1) pour un système de sécurité, en particulier un airbag ou un prétendeur de ceinture d'un véhicule automobile, avec un élément d'amorce (2) pouvant être mis à feu via des composants de branchement, en particulier via des câbles de branchement (4, 5), lequel élément est disposé dans un boîtier (3) et où les composants servant à la protection CEM sont conçus en tant que noyau ferritique (8), où le noyau ferritique (8) est disposé à proximité de l'élément d'amorce (2), caractérisé en ce que le noyau ferritique (8) est encapsulé de manière insensible à la pression.
  2. Dispositif d'amorce (1) selon la revendication 1, caractérisé en ce que le noyau ferritique (8) est encapsulé de manière insensible à la pression dans un boîtier en forme de pot (9).
  3. Dispositif d'amorce (1) selon la revendication 1, caractérisé en ce que le noyau ferritique (8) est encapsulé de manière insensible à la pression par au moins deux coques, en particulier deux demi-coques (11, 12).
  4. Dispositif d'amorce (1) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le noyau ferritique (8) est entouré, au moins partiellement et, en particulier, dans sa totalité, par une couche de protection (13) au cours d'un procédé à basse pression, ladite couche de protection (13) agissant comme l'encapsulage de manière insensible à la pression.
  5. Dispositif d'amorce (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le noyau ferritique (8) encapsulé de manière insensible à la pression est enrobé d'une couche de protection (10) supplémentaire au cours d'un procédé à haute pression.
  6. Dispositif d'amorce (1) selon la revendication 5, caractérisée en ce que la couche de protection (10) supplémentaire forme au moins partiellement le boîtier (3).
EP01109481A 2000-06-02 2001-04-25 Allumeur pour système de sécurité Expired - Lifetime EP1160534B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10027464 2000-06-02
DE10027464A DE10027464A1 (de) 2000-06-02 2000-06-02 Zündvorrichtung für ein Sicherheitssystem

Publications (3)

Publication Number Publication Date
EP1160534A2 EP1160534A2 (fr) 2001-12-05
EP1160534A3 EP1160534A3 (fr) 2002-03-13
EP1160534B1 true EP1160534B1 (fr) 2006-03-08

Family

ID=7644523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01109481A Expired - Lifetime EP1160534B1 (fr) 2000-06-02 2001-04-25 Allumeur pour système de sécurité

Country Status (4)

Country Link
US (1) US6477957B2 (fr)
EP (1) EP1160534B1 (fr)
AT (1) ATE319979T1 (fr)
DE (2) DE10027464A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10226544A1 (de) * 2002-06-14 2003-12-24 Flexiva Automation & Anlagenba Pyrotechnisches Zündsystem
FR2857738B1 (fr) * 2003-07-17 2006-01-20 Giat Ind Sa Composant pyrotechnique et procede de fabrication et de montage d'un tel composant

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6922280U (de) 1969-06-03 1970-01-15 August & Co Kommanditgesellsch Bauelementensatz zur facheinteilung eines kastens,zuges od.dgl.
US3735705A (en) * 1971-07-15 1973-05-29 Amp Inc Filtered electro-explosive device
SE431486B (sv) * 1979-09-03 1984-02-06 Bofors Ab Elektrisk tendare
US4378738A (en) * 1979-12-19 1983-04-05 Proctor Paul W Electromagnetic and electrostatic insensitive blasting caps, squibs and detonators
US5036768A (en) * 1990-02-13 1991-08-06 Dow Robert L Attenuator for dissipating electromagnetic and electrostatic energy
US5355800A (en) * 1990-02-13 1994-10-18 Dow Robert L Combined EED igniter means and means for protecting the EED from inadvertent extraneous electricity induced firing
US5088412A (en) * 1990-07-16 1992-02-18 Networks Electronic Corp. Electrically-initiated time-delay gas generator cartridge for missiles
US5200574A (en) * 1991-04-05 1993-04-06 Morton International, Inc. Universal squib connector
US5241910A (en) * 1991-04-05 1993-09-07 Morton International, Inc. Universal squib connector for a gas generator
US5153368A (en) * 1991-05-28 1992-10-06 Ici Americas, Inc. Filtered electrical connection assembly using potted ferrite element
US5691498A (en) * 1992-02-07 1997-11-25 Trw Inc. Hermetically-sealed electrically-absorptive low-pass radio frequency filters and electromagnetically lossy ceramic materials for said filters
US5454320A (en) * 1992-10-23 1995-10-03 Quantic Industries, Inc. Air bag initiator
JP2700100B2 (ja) * 1993-05-28 1998-01-19 日本工機株式会社 イグナイター
AT522U1 (de) * 1994-03-23 1995-12-27 Hirtenberger Ag Antriebsvorrichtung fuer rueckhaltesysteme in kraftfahrzeugen
DE4435319A1 (de) * 1994-10-01 1996-04-04 Temic Bayern Chem Airbag Gmbh Anzündeinheit für einen Gasgenerator eines passiven Rückhaltesystems
US5932832A (en) * 1996-04-15 1999-08-03 Autoliv Asp, Inc. High pressure resistant initiator with integral metal oxide varistor for electro-static discharge protection
US5827994A (en) * 1996-07-11 1998-10-27 The Ensign-Bickford Company Fissile shock tube and method of making the same
US6357355B1 (en) * 2000-02-10 2002-03-19 Trw Inc. Pyrotechnic igniter with radio frequency filter
DE20002435U1 (de) * 2000-02-11 2000-05-04 Vip-Virant D.O.O., Ljubljana Formgebend umspritzte, elektrische und/oder elektronische Komponente

Also Published As

Publication number Publication date
DE50109124D1 (de) 2006-05-04
US6477957B2 (en) 2002-11-12
US20020030409A1 (en) 2002-03-14
EP1160534A3 (fr) 2002-03-13
DE10027464A1 (de) 2001-12-13
ATE319979T1 (de) 2006-03-15
EP1160534A2 (fr) 2001-12-05

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