FR2809362A1 - Actuator for safety device such as motor vehicle air bag has primary pyrotechnic compound designed to control decomposition of secondary compound - Google Patents
Actuator for safety device such as motor vehicle air bag has primary pyrotechnic compound designed to control decomposition of secondary compound Download PDFInfo
- Publication number
- FR2809362A1 FR2809362A1 FR0006642A FR0006642A FR2809362A1 FR 2809362 A1 FR2809362 A1 FR 2809362A1 FR 0006642 A FR0006642 A FR 0006642A FR 0006642 A FR0006642 A FR 0006642A FR 2809362 A1 FR2809362 A1 FR 2809362A1
- Authority
- FR
- France
- Prior art keywords
- compound
- pyrotechnic
- reaction tube
- explosive charge
- combustion
- 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.)
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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
- B60R21/264—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
-
- 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
- B60R2021/2648—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 comprising a plurality of combustion chambers or sub-chambers
Abstract
Description
DISPOSITIF D'ABSORPTION DE CHOCS POUR VEHICULE AUTOMOBILE La présente invention se rapporte au domaine des dispositifs d'absorption de choc à coussin gonflable de sécurité pour la protection des occupants des véhicules automobiles en cas d'accident. The present invention relates to the field of shock absorption devices with an airbag for protecting the occupants of motor vehicles in the event of an accident.
La présente invention se rapporte plus particulièrement à un dispositif d'absorption de choc pour la protection d'au moins un occupant d'un véhicule automobile, du type constitué par au moins un coussin gonflable sécurité raccordé à un système de génération de gaz comportant une charge explosible formée par au moins un composé pyrotechnique. The present invention relates more particularly to a shock absorption device for the protection of at least one occupant of a motor vehicle, of the type consisting of at least one airbag connected to a gas generation system comprising a explosive charge formed by at least one pyrotechnic compound.
'art antérieur connaît déjà des dispositifs d'absorption de choc pour la protection des occupants des véhicules automobiles comportant un générateur de gaz par combustion d'un composé pyrotechnique. prior art already knows shock absorption devices for the protection of the occupants of motor vehicles comprising a gas generator by combustion of a pyrotechnic compound.
Les inconvénients majeurs des dispositifs de l'art antérieur résident dans le fait que pour atteindre la vitesse de combustion requise, le composé pyrotechnique doit être conditionné dans des structures métalliques qui doivent résister à des pressions de plusieurs centaines de bars. The major drawbacks of the devices of the prior art reside in the fact that in order to reach the required combustion speed, the pyrotechnic compound must be conditioned in metallic structures which must resist pressures of several hundred bars.
La présente invention entend remédier aux inconvénients de l'art antérieur en proposant un générateur à masse et dimensions réduites ne nécessitant pas de surdimensionnement de structure car ne subissant de surpression lors de sa mise en #uvre. The present invention intends to remedy the drawbacks of the prior art by proposing a generator with a reduced mass and dimensions which does not require oversizing of the structure because it does not suffer from overpressure during its implementation.
Pour ce faire, la présente invention du type décrit ci-dessus et elle est remarquable, dans son acception la plus large, en ce que ledit système de génération de gaz comporte au moins un volume de combustion non confiné ou faiblement confiné. Avantageusement, la présente invention permet de maîtriser la température des gaz ainsi que leur cinétique d'expulsion hors du système de génération de gaz pour le gonflement du coussin gonflable de sécurité. To do this, the present invention of the type described above and it is remarkable, in its broadest sense, in that said gas generation system comprises at least one volume of combustion not confined or weakly confined. Advantageously, the present invention makes it possible to control the temperature of the gases as well as their kinetics of expulsion from the gas generation system for the inflation of the airbag.
De plus, la combustion de la charge explosible étant réalisée sous faible confinement, le générateur de gaz n'est pas ou peu propulsif et effets d'une surpression dans la structure du générateur de gaz selon l'invention sont donc beaucoup moins dangereux que les effets d'une telle surpression dans les générateurs de gaz de l'art antérieur. Cet avantage est également important après la fin de vie du véhicule. In addition, the combustion of the explosive charge being carried out under low confinement, the gas generator is not or not very propellant and the effects of an overpressure in the structure of the gas generator according to the invention are therefore much less dangerous than the effects of such an overpressure in gas generators of the prior art. This advantage is also important after the end of the vehicle's life.
Un autre avantage important l'invention est de permettre de placer le générateur de à l'intérieur du coussin gonflable de sécurité. Cet avantage trouve des applications dans la réalisation des coussins gonflable thorax et rideau. Another important advantage of the invention is that it allows the generator to be placed inside the airbag. This advantage finds applications in the production of thorax and curtain airbags.
De par sa souplesse, il peut également être imaginé que l'invention soit positionnée sur des éléments particuliers, comme par exemple, sur ceinture de sécurité. Due to its flexibility, it can also be imagined that the invention is positioned on particular elements, such as for example, on a seat belt.
On comprendra mieux l'invention à l'aide de la description, faite ci-après à titre purement explicatif, d'un mode de réalisation de l'invention, en référence aux figures annexées - la figure 1 illustre une vue en coupe longitudinale du dispositif selon l'invention ; et - la figure 2 illustre une vue en coupe transversale de la troisième variante du dispositif selon l'invention ; et - les figures 3 et 4 illustrent des vues en coupe transversale de composés pyrotechniques monolithes hétérogènes. Le dispositif (1) selon l'invention, illustré figure , est un dispositif d'absorption de choc pour la protection d'au moins un occupant d'un véhicule automobile, du type constitué par au moins un coussin gonflable de sécurité (2) raccordé à un système de génération de gaz (3) comportant une charge explosible (4) formée par au moins un composé pyrotechnique (5). The invention will be better understood on the basis of the description, given below for purely explanatory purposes, of an embodiment of the invention, with reference to the appended figures - FIG. 1 illustrates a view in longitudinal section of the device according to the invention; and - Figure 2 illustrates a cross-sectional view of the third variant of the device according to the invention; and - Figures 3 and 4 illustrate cross-sectional views of heterogeneous monolithic pyrotechnic compounds. The device (1) according to the invention, illustrated in the figure, is a shock absorption device for the protection of at least one occupant of a motor vehicle, of the type consisting of at least one airbag (2) connected to a gas generation system (3) comprising an explosive charge (4) formed by at least one pyrotechnic compound (5).
Le dispositif selon l'invention est caractérisé en ce que ledit système de génération de gaz (3 comporte au moins un volume de combustion (7), non confiné ou faiblement confiné. The device according to the invention is characterized in that said gas generation system (3 comprises at least one combustion volume (7), not confined or slightly confined.
La charge explosible (4) selon 1 invention compor e de préférence plusieurs composés pyrotechniques (5) présentant des vitesses de combustion différentes. La charge explosible (4) comporte moins un composé pyrotechnique primaire (5') à combustion rapide et au moins un composé pyrotechnique secondaire (5") à combustion lente. The explosive charge (4) according to 1 invention preferably comprises several pyrotechnic compounds (5) having different combustion rates. The explosive charge (4) comprises at least one primary pyrotechnic compound (5 ') with rapid combustion and at least one secondary pyrotechnic compound (5 ") with slow combustion.
Les notions de combustion rapide et de combustion lente sont bien sûr à interpréter en fonction des conditions pyrotechniques et du confinement. The concepts of fast combustion and slow combustion are of course to be interpreted according to the pyrotechnic conditions and the confinement.
En effet, lorsque les composés pyrotechniques (5) subissent une combustion, ils forment des qui vont participer au gonflement du coussin gonflable de sécurité. Indeed, when the pyrotechnic compounds (5) undergo combustion, they form which will participate in the inflation of the airbag.
Les gaz émis par ledit ou lesdits composés pyrotechniques primaires (5') pilotent alors le gonflement du coussin gonflable de sécurité et les gaz émis par ledit ou lesdits pyrotechniques secondaires (5") pilotent alors le maintien d'une certaine pression adéquate à l'intérieur du coussin gonflable de sécurité, pendant tout le temps nécessaire à la protection du ou des occupants du véhicule. Ainsi, la température des gaz formés et leur cinétique d'expulsion hors du système de génération de gaz (3) pour le gonflement du coussin gonflable de sécurité (2) parfaitement maîtrisée pendant toute la durée du gonflage. The gases emitted by said primary pyrotechnic compound (s) (5 ') then control the inflation of the airbag and the gases emitted by said secondary pyrotechnic compound (5 ") then control the maintenance of a certain pressure adequate for the inside the airbag, for the entire time necessary to protect the occupant (s) of the vehicle, thus the temperature of the gases formed and their kinetics of expulsion from the gas generation system (3) for the inflation of the airbag safety inflatable (2) perfectly controlled for the duration of inflation.
La présente invention permet ainsi de pressuriser rapidement le coussin gonflable de sécurité (2) et de le maintenir pressurisé de 0,1 seconde pour une protection au niveau du thorax à plusieurs secondes pour des réalisations de type rideau . The present invention thus makes it possible to quickly pressurize the airbag (2) and to keep it pressurized from 0.1 seconds for protection at the level of the chest to several seconds for curtain type embodiments.
Ledit ou lesdits composés pyrotechniques (5) formant ladite charge explosible (4) sont positionnés dans au moins un tube de réaction (20) cylindrique et ledit volume non confiné (7) ou faiblement confiné est constitué par ledit tube réaction (20). Said or said pyrotechnic compounds (5) forming said explosive charge (4) are positioned in at least one cylindrical reaction tube (20) and said unconfined or slightly confined volume (7) consists of said reaction tube (20).
tube de réaction (20) est du type haute pression dont souplesse et la tenue mécanique assurent une ouverture après la combustion des composés pyrotechniques ). reaction tube (20) is of the high pressure type whose flexibility and mechanical strength ensure opening after the combustion of pyrotechnic compounds).
L ouverture du tube de réaction (20) est de préférence programmée par des amorces de ruptures (21). tube de réaction (20) est de préférence positionné dans ledit coussin gonflable de sécurité (2). tube de réaction (20) peut être positionné dans un tube secondaire de réaction (22), poreux, au moins partiellement résistant à la réaction, comme illustré figure 2. The opening of the reaction tube (20) is preferably programmed by rupture primers (21). reaction tube (20) is preferably positioned in said airbag (2). reaction tube (20) can be positioned in a secondary reaction tube (22), porous, at least partially resistant to reaction, as illustrated in FIG. 2.
tube de réaction (20) comporte de préférence un initiateur (24) qui peut éventuellement être muni d'une charge renforcatrice (25). reaction tube (20) preferably includes an initiator (24) which may optionally be provided with a reinforcing charge (25).
Le tube de réaction (20) peut en outre comporter une chambre de stabilisation (23) cylindrique, réalisée, par exemple avec un autre tube ou un sac en tissus. Lesdits composés pyrotechniques (5 peuvent former une charge explosible (4) monolithe homogène ou hétérogène. The reaction tube (20) may further include a cylindrical stabilization chamber (23), made, for example with another tube or a fabric bag. Said pyrotechnic compounds (5 can form an explosive charge (4) homogeneous or heterogeneous monolith.
Lorsque lesdits composés pyrotechniques (5) forment une charge explosible (4) monolithe hétérogène, lesdits composés pyrotechniques (5) se présentent alors en vrac ou sous la forme d'au moins une feuille (8) plate ou enroulée, ou d'au moins un brin (9). When said pyrotechnic compounds (5) form a heterogeneous monolith explosive charge (4), said pyrotechnic compounds (5) are then in bulk or in the form of at least one flat or rolled sheet (8), or at least a strand (9).
La figure 2 illustre une pluralité de brins (9) de composé pyrotechnique (5) positionnée à l'intérieur du tube réaction (20). FIG. 2 illustrates a plurality of strands (9) of pyrotechnic compound (5) positioned inside the reaction tube (20).
La charge explosible (4) constituée par les composes pyrotechniques (5) peut se présenter sous la forme d'un sandwich plat, comme illustré figure 3 ou d'un sandwich enroulé, comme illustré figure 4. The explosive charge (4) constituted by the pyrotechnic compounds (5) can be in the form of a flat sandwich, as illustrated in FIG. 3 or a rolled up sandwich, as illustrated in FIG. 4.
La charge explosible (4) peut également être réalisée sous forme d'une pluralité de brins présentant des diamètres différents. The explosive charge (4) can also be produced in the form of a plurality of strands having different diameters.
Pour plus de clarté, le tube secondaire de réaction (22) et la chambre de stabilisation ( ) ne sont pas représentés sur les figures 1, 3 et 4. For clarity, the secondary reaction tube (22) and the stabilization chamber () are not shown in Figures 1, 3 and 4.
Dans une version préférée de l'invention, lesdits composés pyrotechniques primaires (5') et lesdits composés pyrotechniques secondaires (5'') sont constitués par des propergols du type de ceux qui sont utilisés dans les systèmes de coussin gonflable de sécurité automobile, en particulier ceux constitués d'un liant chargé avec des nitrates alcalins ou alcalino-terreux. In a preferred version of the invention, said primary pyrotechnic compounds (5 ′) and said secondary pyrotechnic compounds (5 ″) consist of propellants of the type of those used in automobile airbag systems, in particular especially those consisting of a binder loaded with alkaline or alkaline earth nitrates.
Ces propergols peuvent être extrudés, par exemple, en brin de 3 mm de diamètre et de 10 cm de longueur. Ces brins sont conditionnés dans un tube muni éventuellement d'un relais d'allumage. Le système d'allumage principal allume les brins sur leurs surfaces latérales de manière telle que combustion des brins se développe de façon radiale. These propellants can be extruded, for example, into strands of 3 mm in diameter and 10 cm in length. These strands are packaged in a tube possibly fitted with an ignition relay. The main ignition system ignites the strands on their side surfaces in such a way that combustion of the strands develops radially.
Selon les applications, une partie de cette surface peut être inhibée pour ralentir le développement la pression dans la phase initiale. Depending on the applications, part of this surface can be inhibited to slow the development of pressure in the initial phase.
Un refroidissant peut en outre être prévu, comme exemple, du nitrate d'ammonium. A coolant can also be provided, for example, ammonium nitrate.
Lors de la mise en oeuvre, l'augmentation de pression ouvre le tube de réaction à partir de ses amorces de rupture et le tube secondaire de réaction permet néanmoins de maintenir une pression modérée. During implementation, the increase in pressure opens the reaction tube from its rupture initiators and the secondary reaction tube nevertheless makes it possible to maintain a moderate pressure.
Cette variation de pression lors de l'ouverture a pour fet de diminuer la vitesse de combustion et permettre de poursuivre la génération de gaz pour maintenir la pressurisation du coussin. This variation in pressure during opening has the effect of reducing the combustion speed and making it possible to continue the generation of gas to maintain the pressurization of the cushion.
Par exemple, pour un générateur de gaz à coussin gonflable de sécurité rideau d'un volume de 22 litres présentant une durée d'efficacité supérieure à 3 secondes, le propergol est conditionné en 15 brins de 10 cm de long environ et d'environ 3 mm de diamètre. Ces brins sont partagés en deux fagots répartis de part et d'autre l'allumeur. For example, for a curtain airbag gas generator with a volume of 22 liters having a duration of efficiency greater than 3 seconds, the propellant is packaged in 15 strands of approximately 10 cm long and approximately 3 mm in diameter. These strands are divided into two bundles distributed on either side of the igniter.
Cette invention permet de maîtris parfaitement le temps pendant lequel le coussin gonflable de sécurité (2) reste gonflé. This invention makes it possible to perfectly control the time during which the airbag (2) remains inflated.
Cette invention permet en outre de réaliser dispositif de protection présentant une forme essentiellement longiligne qui peut être placé, par exemple, au-dessus d'une portière.This invention also makes it possible to produce a protection device having an essentially slender shape which can be placed, for example, above a door.
Claims (1)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0006642A FR2809362B1 (en) | 2000-05-24 | 2000-05-24 | SHOCK ABSORBING DEVICE FOR MOTOR VEHICLE |
| FR0102274A FR2809366B1 (en) | 2000-05-24 | 2001-02-20 | DEVICE FOR IMPLEMENTING A SECURITY ELEMENT |
| AT01938331T ATE284328T1 (en) | 2000-05-24 | 2001-05-23 | DEVICE FOR ACTIVATING A SECURITY ELEMENT FOR GOODS AND PERSONAL PROTECTION |
| AU2001264018A AU2001264018A1 (en) | 2000-05-24 | 2001-05-23 | Device for operating an element, in particular a safety element, for protecting goods and/or people |
| DE60107674T DE60107674T2 (en) | 2000-05-24 | 2001-05-23 | DEVICE FOR ACTIVATING A SAFETY ELEMENT FOR GOODS AND PERSONAL PROTECTION |
| PCT/FR2001/001612 WO2001089885A1 (en) | 2000-05-24 | 2001-05-23 | Device for operating an element, in particular a safety element, for protecting goods and/or people |
| EP01938331A EP1284893B1 (en) | 2000-05-24 | 2001-05-23 | Device for operating an element, in particular a safety element, for protecting goods and/or people |
| US10/301,972 US7695007B2 (en) | 2000-05-24 | 2002-11-22 | Device for deployment of an element, particularly a safety element, for the protection of goods and/or people |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0006642A FR2809362B1 (en) | 2000-05-24 | 2000-05-24 | SHOCK ABSORBING DEVICE FOR MOTOR VEHICLE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2809362A1 true FR2809362A1 (en) | 2001-11-30 |
| FR2809362B1 FR2809362B1 (en) | 2002-10-04 |
Family
ID=8850568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0006642A Expired - Fee Related FR2809362B1 (en) | 2000-05-24 | 2000-05-24 | SHOCK ABSORBING DEVICE FOR MOTOR VEHICLE |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2809362B1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0480085A1 (en) * | 1989-09-29 | 1992-04-15 | Dornier Gmbh | Gas generator |
| EP0728630A1 (en) * | 1995-02-23 | 1996-08-28 | Morton International, Inc. | Gas generation and ignition system for airbag inflation |
| US5655790A (en) * | 1995-06-06 | 1997-08-12 | Trw Vehicle Safety Systems Inc. | Air bag inflator |
| WO2000032447A1 (en) * | 1998-11-30 | 2000-06-08 | Takata Restraint Systems Inc. | Pyrotechnic inflator for a vehicle |
| WO2000046079A1 (en) * | 1999-02-05 | 2000-08-10 | Oea, Inc. | Vehicle inflator with stored gas for supplementing inflation |
-
2000
- 2000-05-24 FR FR0006642A patent/FR2809362B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0480085A1 (en) * | 1989-09-29 | 1992-04-15 | Dornier Gmbh | Gas generator |
| EP0728630A1 (en) * | 1995-02-23 | 1996-08-28 | Morton International, Inc. | Gas generation and ignition system for airbag inflation |
| US5655790A (en) * | 1995-06-06 | 1997-08-12 | Trw Vehicle Safety Systems Inc. | Air bag inflator |
| WO2000032447A1 (en) * | 1998-11-30 | 2000-06-08 | Takata Restraint Systems Inc. | Pyrotechnic inflator for a vehicle |
| WO2000046079A1 (en) * | 1999-02-05 | 2000-08-10 | Oea, Inc. | Vehicle inflator with stored gas for supplementing inflation |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2809362B1 (en) | 2002-10-04 |
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| CL | Concession to grant licences | ||
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