[go: up one dir, main page]

WO1997008018A2 - Dispositif d'amorçage premature - Google Patents

Dispositif d'amorçage premature Download PDF

Info

Publication number
WO1997008018A2
WO1997008018A2 PCT/EP1996/003430 EP9603430W WO9708018A2 WO 1997008018 A2 WO1997008018 A2 WO 1997008018A2 EP 9603430 W EP9603430 W EP 9603430W WO 9708018 A2 WO9708018 A2 WO 9708018A2
Authority
WO
WIPO (PCT)
Prior art keywords
gas generator
primary
ignition
container
ignition device
Prior art date
Application number
PCT/EP1996/003430
Other languages
German (de)
English (en)
Other versions
WO1997008018A3 (fr
Inventor
Franz Fürst
Jürgen Mayer
Original Assignee
Trw Airbag Systems Gmbh & Co. Kg.
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 Trw Airbag Systems Gmbh & Co. Kg. filed Critical Trw Airbag Systems Gmbh & Co. Kg.
Publication of WO1997008018A2 publication Critical patent/WO1997008018A2/fr
Publication of WO1997008018A3 publication Critical patent/WO1997008018A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder

Definitions

  • the invention relates to a pre-ignition device for igniting the propellant charge of an airbag gas generator for a motor vehicle occupant protection device due to local thermal heating of the gas generator housing, the pre-ignition device having a temperature of below 400 ° C, preferably between 150 ° C and 200 ° C self-igniting, for example powder-filled primary primer filled container which is arranged within the gas generator housing in close heat-conducting surface contact with an upper part of the gas generator housing and in close proximity to an igniter filled with a secondary primer which is ignited by the primary primer can be detected and then in turn ignites the propellant charge of the airbag gas generator.
  • a pre-ignition device for igniting the propellant charge of an airbag gas generator for a motor vehicle occupant protection device due to local thermal heating of the gas generator housing
  • the pre-ignition device having a temperature of below 400 ° C, preferably between 150 ° C and 200 ° C self-igniting, for example powder-filled primary primer filled container which is arranged within
  • airbag gas generators produce gas for filling an airbag, which then a vehicle occupant before the impact on hard vehicle interior parts like that
  • Gas generators are generally of a pyrotechnic type and is therefore subject to approval in Germany by the Federal Institute for Materials Research and Testing (BAM).
  • BAM Federal Institute for Materials Research and Testing
  • a requirement is the so-called fire test. It says that when the gas generator is heated by a flame (e.g. gas flame) the gas generator may ignite, but must remain intact in the process, i.e. that the gas generator must not be fragmented.
  • pyrotechnic gas generators function in such a way that a current pulse from the sensor that detects a vehicle crash sorik an igniter is ignited in the gas generator.
  • the ignition is enhanced by a so-called ignition charge, which generates hot particles. These hot particles then hit the surface of the fuel, which is usually in tablet form, which then ignites itself and burns under high pressure in the combustion chamber. This creates the gas for filling the airbag. Since, in addition to pure gas, liquid or solid components are also formed during combustion, the gas stream is cleaned by appropriate filters in the filter chamber before it exits the gas generator.
  • Known gas generators mostly use azide-containing fuels to generate the gases for filling the airbag in the short time of about 30 ms.
  • the autoignition temperature of these fuels is around 400 ° C.
  • the gas generator housing is today predominantly made of an aluminum alloy, the low strength of which is known at high temperatures. For this reason, in order to meet the fire test for this type of gas generator, a pre-ignition device must be integrated into the gas generator, which causes the fuel to ignite at a temperature below 400 ° C, but above typical operating temperatures of up to 100 ° C.
  • pre-ignition devices are usually designed such that they are in contact with the housing of the gas generator at one point in the gas generator.
  • a so-called pre-ignition powder is used, which is usually a stabilized NC powder with a self-ignition temperature of approx.
  • the early ignition powder must be hermetically sealed in a container or in a chamber. In order that this pre-ignition device also functions reliably, care is taken to ensure that the heat conduction between the pre-ignition device and the housing is as good as possible.
  • Such a self-ignition device is described, for example, in US Pat there is good thermal contact with the upper part of the gas generator housing.
  • the primary ignition means is ignited, burns through the package and ignites the gas generating means or the pyrotechnic material in order to trigger the inflator of the airbag system.
  • DE 39 41 690 A1 also describes an ignition device for gas-developing material for use in airbag systems in which a container contains a homogeneous mixture of propellant and self-igniting material in the form of many small cylindrical propellants, all of which are arbitrary Mixture of the ignitable material are aligned, ent.
  • the container is screwed into the gas generator housing at one end face and is in thermal contact with the gas generator housing via this screw-in point, so that when the gas generator housing is heated near the screw-in point, the self-igniting mixture in the container is heated by heat conduction and when the is overwritten
  • Ignition temperature is ignited.
  • a disadvantage of these known constructions is that only one local point of the housing is provided with good heat conduction to the pre-ignition device. As a result, it can happen that when the housing is heated at a location far away from the pre-ignition device (for example the opposite side), the time until the pre-ignition powder is ignited is too long. in the- In this case, the strength of the housing material is already impaired to such an extent that ultimately the fragmentation of the housing structure, which must be avoided, does occur.
  • DE 42 01 651 A1 discloses an auto-ignition device for an airbag inflator which has a thermoelectric battery, which is preferably arranged outside the inflator housing.
  • the thermoelectric battery is to deliver an electrical signal in a predetermined ignition temperature range, which actuates the inflator.
  • the self-ignition of the gas generating means should not be influenced by construction criteria and / or the thermal conductivity of the inflator housing.
  • a disadvantage of this solution is that a complex auto-ignition sensing device must be provided outside the inflator housing, with which the temperature is measured at the corresponding point on the outside of the gas generator housing. Furthermore, a thermoelectric battery is necessary to generate an ignition current Finally, the ignition current must be conducted into the ignition device inside the gas generator housing via specially provided lead wires.
  • the object of the present invention is to present a pre-ignition device with the features described in the introduction, in which, on the one hand, an expensive temperature sensing system and the generation of an electrical ignition current are avoided, but on the other hand it is ensured that even with only local heating of the Gas generator housing addresses the pre-ignition device in good time before the housing overheats.
  • this object is achieved in a surprisingly simple but effective manner in that the container filled with primary ignition means is designed and arranged within the gas generator housing in such a way that it is in close proximity with a lower part of the gas generator housing opposite the upper part , heat-conducting surface contact. This creates at least two thermal contact surfaces for the heat conduction from the gas generator housing to the pre-ignition device and thus to the primary ignition means.
  • the good heat conduction between the housing and the pre-ignition device is independent of whether the housing is heated locally from the top or from the bottom, because both parts of the housing are now in heat contact with the pre-ignition container at the same time, so that the distances between the respective heating point and the contact surface are minimized.
  • the housing components of the gas generator housing can be optimally designed with regard to their strength and weight, because the housing temperatures reached up to the ignition are considerably lower than with known devices even when the housing is heated locally.
  • the igniter containing the secondary ignition agent projects into the container with the primary ignition agent, so that surface parts of the igniter are in direct contact with the primary ignition agent.
  • the primary igniter is ignited, this can shorten the response time until the secondary igniter is triggered in the igniter.
  • the upper and / or lower part of the gas generator housing are in direct contact with the primary primer. This will
  • Thermal contact between the gas generator housing and the primary ignition medium improved, which also benefits a shorter response time of the early ignition device when the gas generator housing is heated.
  • the container with the primary ignition means is in heat-conducting contact with the gas generator housing at more than two locations. This measure also reduces the response time of the pre-ignition device according to the invention and increases the probability of response.
  • the primary primer is preferably selected such that it can directly ignite the propellant charge of the airbag gas generator even without an additional booster charge. This results in a simplified and less expensive construction of the pre-ignition device.
  • an amplifier charge can still be used, and in a further embodiment, particles of an amplifier charge having a higher ignition temperature but greater heat development than the primary ignition agent are advantageously contained in the container with the primary ignition agent in a mixture that is as homogeneous as possible.
  • a mixture is known per se from DE 39 41 690 A1 cited above, but not in connection with the structural features of the pre-ignition device according to the invention.
  • particles of an amplifier charge can also. be contained in the propellant charge of the airbag gas generator itself. This increases the likelihood of the igniter responding and thus also increases the safety of the entire device.
  • an amplifier charge can also be arranged around the container with the primary ignition means, so that after the initial ignition of the primary ignition means due to heating of the gas generator housing, first the amplifier charge with its higher ignition temperature but greater heat development and then due to the increased heat immediately following the actual propellant charge are ignited.
  • the container with the primary ignition means is cap-shaped and can be plugged onto a base in the lower part of the gas generator housing, which grips around a lighter containing the secondary ignition agent.
  • FIG. 1 shows a schematic longitudinal section through an embodiment of the pre-ignition device according to the invention.
  • Fig. 2 shows a schematic longitudinal section through a pre-ignition device according to the prior art.
  • the gas generator housing 1 shown in FIG. 1 has an upper part 2 and a lower part 3, each of which is generally made of metal, usually an aluminum alloy, and is mechanically connected to one another by means of clamping, screwing, etc., on the inside of the There is a combustion chamber 4 and a filter chamber 5 in the gas generator housing 1.
  • a lighter 7 is held by clamps 6, which, via electrical contacts 8 from the outside in the event of an abrupt, strong negative acceleration, provides a corresponding electrical charge receives signal for igniting a propellant charge, with which an airbag of an airbag in a motor vehicle is ignited to protect the vehicle occupant sitting in front of the device.
  • the gas generator housing 1 Since the gas generator housing 1, as mentioned above, is usually made of a not particularly heat-resistant aluminum alloy, it would become the self-ignition temperature when heated to 400 ° C. corresponds to the propellant charge located in the igniter 7, deform strongly or even burst. If, in the event of heating, for example in the event of a fire, the propellant charge in the igniter 7 were only ignited at this late point in time, the gas generator housing could possibly burst when the airbag was inflated and cause a damaging splintering effect inside the vehicle.
  • a pre-ignition device 9 consisting of a thin-walled container 10 made of sheet metal and primary ignition means 11 located therein with a self-ignition temperature of approximately 150 ° C. to 200 ° C. is provided for the case of heating.
  • the primary ignition means 11 can also be mixed with particles of an amplifier charge with a higher ignition temperature but greater heat development than the primary ignition means 11.
  • the container 10 of the pre-ignition device 9 is in close thermal surface contact 12 on the one hand with the upper part 2 of the gas generator housing 1, but on the other hand also with the oppositely opposite lower part 3 via the contact surfaces 13. This ensures that the pre-ignition device also with one-sided local heating, for example of the lower part 3, responds in good time before the gas generator housing 1 is deformed or fragmented due to excessive overheating.
  • the igniter 7 projects into the container 10 with the primary igniter 11, so that surface parts of the igniter 7 are in direct contact with the primary igniter 11.
  • the primary ignition means 11 is also in direct flat and thus heat-conducting contact with the lower part 3 of the gas generator housing 1.
  • the container 10 or the primary ignition means 11 itself can be in heat-conducting contact with the gas generator housing 1 at more than the above-mentioned points in order to determine the response time from the start of the heating of the gas generator housing 1 until the ignition of the pre-ignition device 9 is further shortened and its response probability is further increased.
  • 2 shows an early ignition device 29 according to the prior art. It contains a container 20 filled with primary ignition means 11, which, like the pre-ignition device 9 according to the invention, is in thermal contact with an upper part 2 of a gas generator housing over a surface 12 ', but only adjoins on its underside with a container 30 for an amplifier charge 31.
  • the particles of the booster charge 31 generally have a significantly higher auto-ignition temperature (approx. 400 ° C.) than the primary ignition means 11, in the pre-ignition device shown in FIG. 2, the device is ignited when the lower part 3 is heated locally take place relatively late, either when the relatively high auto-ignition temperature of the booster charge 31 is reached in the area of the brackets 6, or when the upper part 2 of the gas generator housing is heated to such an extent over a long heat conduction path and with a correspondingly great time delay that the primary ignition means 11 itself ignited.
  • auto-ignition temperature approximately 400 ° C.

Landscapes

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

Abstract

L'invention concerne un dispositif d'amorçage prématuré (9) servant à amorcer une charge propulsive d'un générateur de gaz d'airbag destiné à un système de protection des passagers d'un véhicule, sur la base du chauffage localisé du boîtier (1) du générateur de gaz. Ce dispositif comprend un réservoir (10) rempli d'amorce primaire (11), par exemple sous forme de poudre, qui s'enflamme spontanément à des températures inférieures à 400 °C, de préférence entre 150 et 200 °C. Ce réservoir (10) est disposé à l'intérieur du boîtier (1) du générateur de gaz, en étroit contact (12) thermoconducteur avec une partie supérieure (2) du boîtier (1) du générateur de gaz et de façon directement adjacente à un dispositif d'amorçage (7) rempli d'amorce secondaire. Ce dispositif d'amorçage (7), qui peut être amorcé par l'amorce primaire (11), amorce ensuite la charge propulsive du générateur de gaz de l'airbag. L'invention est caractérisée en ce que le réservoir (10) rempli d'amorce primaire (11) est conçu, et disposé à l'intérieur du boîtier(1) du générateur de gaz, de sorte qu'il soit en étroit contact thermoconducteur avec une partie inférieure (3) du boîtier (1) du générateur de gaz opposée à la partie supérieure (2). Il est ainsi possible, avec des coûts de conception minimes, de réduire le temps de réponse entre le début du chauffage localisé du boîtier (1) du générateur de gaz et l'amorçage du dispositif d'amorçage prématuré (9) et d'accroître la probabilité de réponse.
PCT/EP1996/003430 1995-08-29 1996-08-03 Dispositif d'amorçage premature WO1997008018A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19531666.5 1995-08-29
DE1995131666 DE19531666A1 (de) 1995-08-29 1995-08-29 Frühzündeinrichtung

Publications (2)

Publication Number Publication Date
WO1997008018A2 true WO1997008018A2 (fr) 1997-03-06
WO1997008018A3 WO1997008018A3 (fr) 1997-03-27

Family

ID=7770619

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/003430 WO1997008018A2 (fr) 1995-08-29 1996-08-03 Dispositif d'amorçage premature

Country Status (2)

Country Link
DE (1) DE19531666A1 (fr)
WO (1) WO1997008018A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8276521B2 (en) 2007-10-05 2012-10-02 Takata AG Gas generator for an airbag module

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19914241A1 (de) * 1999-03-29 2000-10-05 Nico Pyrotechnik Zündeinrichtung für eine Insassenschutzvorrichtung eines Kraftfahrzeuges
EP1101668B1 (fr) 1999-11-22 2004-07-14 Hirschmann Automotive GmbH Allumeur
DE102007023046A1 (de) * 2007-05-16 2008-11-20 Trw Airbag Systems Gmbh Gasgenerator
DE102007060451A1 (de) * 2007-12-12 2009-06-18 Takata-Petri Ag Gasgenerator für ein Gassackmodul
DE102011012773B4 (de) * 2011-03-01 2024-03-07 Zf Airbag Germany Gmbh Gasgenerator mit Frühzündmittel

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561675A (en) * 1984-04-02 1985-12-31 Morton Thiokol, Inc. Auto ignition device
GB2218698A (en) * 1988-01-19 1989-11-22 Talley Automotive Prod Inflator device for deployment of a motor vehicle passenger passive restraint system
CA1293275C (fr) * 1988-01-19 1991-12-17 Ronald Zander Bague de deflexion pour l'emploi avec des gonfleurs pour dispositifs automatiques de securite
US4858951A (en) * 1988-05-04 1989-08-22 Trw Vehicle Safety Systems, Inc. Igniter for gas generating material
DE3824469C1 (fr) * 1988-07-19 1990-01-04 Bayern-Chemie Gesellschaft Fuer Flugchemische Antriebe Mbh, 8012 Ottobrunn, De
US4907819A (en) * 1988-09-16 1990-03-13 Talley Automotive Products, Inc. Lightweight non-welded gas generator with rolled spun lip
JP3115381B2 (ja) * 1990-11-28 2000-12-04 デイナミート ノーベル アクチエンゲゼルシヤフト エアバッグ用のガス発生器、特に管型ガス発生器
US5100170A (en) * 1991-01-22 1992-03-31 Trw Vehicle Safety Systems Inc. Auto-ignition device for an air bag inflator
JPH05185899A (ja) * 1992-01-10 1993-07-27 Takata Kk エアバッグ装置のインフレータ
DE4301794C1 (de) * 1993-01-23 1994-05-26 Temic Bayern Chem Airbag Gmbh Airbag-Gasgenerator mit einem Selbstzündmittel
US5350193A (en) * 1993-06-22 1994-09-27 Nippon Koki Co., Ltd. Air bag inflation gas generator
JPH07232613A (ja) * 1993-12-28 1995-09-05 Nippon Kayaku Co Ltd エアバッグ用ガス発生器およびスクイブ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8276521B2 (en) 2007-10-05 2012-10-02 Takata AG Gas generator for an airbag module

Also Published As

Publication number Publication date
DE19531666A1 (de) 1997-03-06
WO1997008018A3 (fr) 1997-03-27

Similar Documents

Publication Publication Date Title
DE69832372T2 (de) Anzünder mit einer lose aufgehäuften zündladung
DE112017002069B4 (de) Gasgenerator mit Selbstentzündungsmittel
DE3914690C2 (fr)
DE69102504T2 (de) Flüssiger Brennstoff-Gas-Generator für eine Vorrichtung zum Schützen eines Insassen eines Fahrzeuges.
DE69306017T2 (de) Hybrider Gasgenerator
DE69304183T2 (de) Aufblaseinheit
JP3115381B2 (ja) エアバッグ用のガス発生器、特に管型ガス発生器
US8176851B2 (en) Small gas generator for gas actuator and pretensioner system
US5556132A (en) Vehicle occupant restraint with auto ignition material
DE19732650B4 (de) Leitungstrenner
US4704966A (en) Method of forming IR smoke screen
US20060150855A1 (en) Gas generator
DE4419549A1 (de) Aufblaseinrichtung für eine Luft- bzw. Gassackeinrichtung
DE69424955T2 (de) Aufblasanordnung
WO1997008018A2 (fr) Dispositif d'amorçage premature
DE19925954A1 (de) Mit zündfähigem Gas gestarteter, pyrotechnischer Gasgenerator
EP1474317B1 (fr) Generateur de gaz froid
DE19725476A1 (de) Gasgenerator
DE69405067T2 (de) Führungselement mit permanenten Haltemitteln für ein metallisches Zündrohr
DE19507208A1 (de) Gasgenerator, insbesondere für einen Airbag, mit einem Ladebehälter und einem Flammleitrohr
DE19541924A1 (de) Gasgenerator
EP0882628B1 (fr) Générateur de gaz
GB1585221A (en) Igniter for a block of combustible powder
EP0882627B1 (fr) Générateur de gaz et méthode de fonctionnement d'un générateur de gaz
DE19529553A1 (de) Anordnung zum Öffnen der Berstmembran von Druckgasflaschen in Gasgeneratoren

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): BR CN JP KR US

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

AK Designated states

Kind code of ref document: A3

Designated state(s): BR CN JP KR US

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase