FR3095622A1 - Driver's airbag with two pockets - Google Patents
Driver's airbag with two pockets Download PDFInfo
- Publication number
- FR3095622A1 FR3095622A1 FR1904538A FR1904538A FR3095622A1 FR 3095622 A1 FR3095622 A1 FR 3095622A1 FR 1904538 A FR1904538 A FR 1904538A FR 1904538 A FR1904538 A FR 1904538A FR 3095622 A1 FR3095622 A1 FR 3095622A1
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- Prior art keywords
- airbag
- inflation
- bag
- pockets
- 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.)
- Granted
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- 230000001815 facial effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 208000028771 Facial injury Diseases 0.000 description 1
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Classifications
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- 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
- B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
- B60R21/203—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in steering wheels or steering columns
-
- 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
- B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
- B60R21/217—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
-
- 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
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R21/233—Inflatable members characterised by their shape, construction or spatial configuration comprising a plurality of individual compartments; comprising two or more bag-like members, one within the other
-
- 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
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R21/2334—Expansion control features
- B60R21/2346—Soft diffusers
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- 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
-
- 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
- B60R21/261—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 with means other than bag structure to diffuse or guide inflation fluid
-
- 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
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R21/233—Inflatable members characterised by their shape, construction or spatial configuration comprising a plurality of individual compartments; comprising two or more bag-like members, one within the other
- B60R2021/23324—Inner walls crating separate compartments, e.g. communicating with vents
-
- 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
- B60R2021/26058—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 combination of inflators
-
- 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
- B60R21/261—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 with means other than bag structure to diffuse or guide inflation fluid
- B60R2021/2612—Gas guiding means, e.g. ducts
- B60R2021/2615—Gas guiding means, e.g. ducts for diverting the gas into a plurality of bags
-
- 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
- B60R2021/2633—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 with a plurality of inflation levels
Abstract
L’invention concerne un coussin gonflable de sécurité pour conducteur de véhicule automobile prévu pour être logé dans sa configuration non déployé à l’intérieur du moyeu (5) du volant (3) dudit véhicule, ledit coussin gonflable comportant un sac gonflable replié (11) ainsi qu’un générateur de gaz pour assurer le gonflage et le déploiement dudit sac (11), ledit sac gonflable (11) comprenant au moins une première poche (111) apte à se déployer contre et à l’arrière dudit volant (3) ; caractérisé en ce que ledit sac gonflable (11) comprend également une seconde poche (112) apte à se déployer en périphérie externe de ladite première poche (111) entre cette dernière et le buste du conducteur, ladite seconde poche (112) présentant une pression de gonflage inférieure à celle de ladite première poche (111). Figure à publier avec l’abrégé : Fig. 4The invention relates to an airbag for driver of a motor vehicle intended to be accommodated in its undeployed configuration inside the hub (5) of the steering wheel (3) of said vehicle, said airbag comprising a folded airbag (11). ) as well as a gas generator for inflating and deploying said bag (11), said inflatable bag (11) comprising at least a first pocket (111) capable of being deployed against and behind said steering wheel (3 ); characterized in that said inflatable bag (11) also comprises a second pocket (112) capable of being deployed on the outer periphery of said first pocket (111) between the latter and the driver's chest, said second pocket (112) having a pressure inflation lower than that of said first pocket (111). Figure to be published with the abstract: Fig. 4
Description
L'invention concerne d’une manière générale les coussins gonflables de sécurité communément désignés sous la dénomination anglaise « airbag », et en particulier ceux destinés à être montés dans le moyeu du volant de direction d’un véhicule automobile pour protéger le conducteur de ce véhicule.The invention generally relates to airbags commonly referred to as "airbag", and in particular those intended to be mounted in the hub of the steering wheel of a motor vehicle to protect the driver from this vehicle.
Les véhicules automobiles comportent un volant de direction manœuvré par le conducteur, qui est fixé en haut d'une colonne de direction pour exercer dessus une rotation transmise à un boîtier de direction situé à son extrémité inférieure, ce boîtier appliquant sur les deux roues avant un angle de braquage pour assurer la direction du véhicule.Motor vehicles comprise a steering wheel operated by the driver, which is fixed at the top of a steering column to exert a rotation thereon transmitted to a steering box located at its lower end, this box applying to the two front wheels a steering angle to steer the vehicle.
Le volant de direction comporte généralement dans son moyeu central en forme de cuvette, un coussin gonflable de sécurité comportant de manière classique un sac gonflable replié et un générateur de gaz pour assurer le gonflage dudit sac.The steering wheel generally comprises in its central hub in the shape of a bowl, an air bag conventionally comprising a folded air bag and a gas generator to inflate said bag.
Ce générateur de gaz est actionnable via un calculateur électronique relié à des capteurs de détection des chocs subis par le véhicule.This gas generator can be operated via an electronic computer connected to sensors for detecting the shocks suffered by the vehicle.
En cas de choc avant violent notamment lors d’un accident, le sac est brutalement mis sous pression par le générateur de gaz et se déploie dans l’habitacle du véhicule pour amortir le choc et protéger le buste du conducteur et en particulier sa tête.In the event of a violent front impact, particularly during an accident, the bag is suddenly pressurized by the gas generator and deploys in the passenger compartment of the vehicle to cushion the impact and protect the driver's chest and in particular his head.
Un tel coussin gonflable est décrit notamment dans le document allemand DE 36 30 685 A1.Such an airbag is described in particular in the German document DE 36 30 685 A1.
La pression de gonflage du sac est généralement prédéterminée pour s’adapter à un conducteur de morphologie moyenne correspondant au mannequin test 50èmepercentile, de sorte que la course de pénétration de son buste dans ce sac gonflable soit suffisamment importante pour assurer un bon amortissement du choc tout en étant inférieure à sa profondeur de gonflage afin d’éviter que le buste du conducteur et en particulier sa tête ne le traverse entièrement et ne vienne percuter le volant.The inflation pressure of the bag is generally predetermined to accommodate a medium morphology driver corresponding to the test dummy 50 th percentile, so that the stroke of penetration of the bust in the air bag is sufficiently large to ensure a good damping of the impact while being less than its inflation depth in order to prevent the driver's chest and in particular his head from crossing it entirely and striking the steering wheel.
Dans le cas d’un conducteur de forte corpulence correspondant par exemple au mannequin test 95èmepercentile et dont l’énergie cinétique du buste est bien supérieure, le risque est grand que son buste (et en particulier sa tête) traverse entièrement le sac gonflable et vienne percuter le volant.In the case of a conductive corpulent corresponding for example to test dummy 95 th percentile and whose kinetic energy of the trunk is greater, the risk is greater than his bust (and in particular its head) completely crosses the airbag and hit the steering wheel.
Afin de réduire les risques de blessures de ces conducteurs, une solution consiste à augmenter la pression de gonflage du sac (et donc sa raideur) mais cela a pour inconvénient de générer un « effet gifle » pouvant entrainer des contusions faciales.In order to reduce the risk of injury to these drivers, one solution consists in increasing the inflation pressure of the bag (and therefore its stiffness) but this has the disadvantage of generating a “slap effect” which can lead to facial bruising.
Il est également connu d’associer le coussin gonflable à une colonne de direction rétractable. L’exercice d’une pression supérieure à un seuil prédéterminé contre le volant entrainant l’écrasement d’une partie moins rigide de cette colonne de direction et l’enfoncement axial du volant.It is also known to associate the airbag with a retractable steering column. The exertion of a pressure greater than a predetermined threshold against the steering wheel causing the crushing of a less rigid part of this steering column and the axial depression of the steering wheel.
Toutefois, bien que cet écrasement d’une portion de la colonne de direction permette également d’absorber une partie de l’énergie cinétique résiduelle, le risque de blessures faciales demeure élevé.However, although this crushing of a portion of the steering column also absorbs some of the residual kinetic energy, the risk of facial injuries remains high.
La présente invention vise à améliorer la sécurité des conducteurs en cas de choc frontal.The present invention aims to improve the safety of drivers in the event of a frontal impact.
Elle propose à cet effet un coussin gonflable de sécurité pour conducteur de véhicule automobile prévu pour être logé dans sa configuration non déployé à l’intérieur du moyeu du volant dudit véhicule, ledit coussin gonflable comportant un sac gonflable replié ainsi qu’un générateur de gaz pour assurer le gonflage et le déploiement dudit sac, ledit sac gonflable comprenant au moins une première poche apte à se déployer contre et à l’arrière dudit volant ; caractérisé en ce que ledit sac gonflable comprend également une seconde poche apte à se déployer en périphérie externe de ladite première poche entre cette dernière et le buste du conducteur, ladite seconde poche présentant une pression de gonflage inférieure à celle de ladite première poche.It proposes for this purpose an airbag for the driver of a motor vehicle intended to be housed in its undeployed configuration inside the hub of the steering wheel of said vehicle, said airbag comprising a folded airbag and a gas generator to inflate and deploy said bag, said inflatable bag comprising at least a first pocket able to deploy against and at the rear of said steering wheel; characterized in that said airbag also comprises a second pocket capable of being deployed on the outer periphery of said first pocket between the latter and the driver's chest, said second pocket having an inflation pressure lower than that of said first pocket.
Cette seconde poche externe de pression inférieure permet d’obtenir, en cas de choc frontal, une course de pénétration satisfaisante du buste du conducteur (y compris si celui-ci est de faible corpulence), de sorte à absorber la majeure partie de son énergie cinétique tout en évitant l’effet « gifle »,.This second external pocket of lower pressure makes it possible to obtain, in the event of a frontal impact, a satisfactory penetration path for the driver's chest (even if the latter is of small build), so as to absorb the major part of his energy. kinetic while avoiding the "slap" effect.
La première poche de pression supérieure permet quant à elle de limiter la course d’enfoncement du buste d’un conducteur de forte corpulence s’enfonçant sur toute la profondeur de la seconde poche externe, de sorte à absorber son restant d’énergie cinétique afin d’éviter que sa tête ne traverse entièrement le sac gonflable et ne vienne percuter le volant.The first upper pressure pocket makes it possible to limit the sinking stroke of the bust of a driver of large build sinking over the entire depth of the second external pocket, so as to absorb his remaining kinetic energy in order to to prevent his head from completely crossing the air bag and colliding with the steering wheel.
Selon des caractéristiques préférées du coussin gonflable de sécurité selon l’invention :
- la pression de gonflage de ladite première poche est comprise entre 1,10 et 1,15 bar, tandis que celle de ladite seconde poche est comprise entre 1,25 et 1,35 bar ;
- ladite première poche et ladite seconde poche sont dotées chacune d’au moins un orifice de gonflage respectif relié fluidiquement à la sortie dudit générateur de gaz par une conduite correspondante ;
- chaque au moins dite conduite reliant fluidiquement ladite seconde poche audit générateur de gaz est constituée par un tuyau souple traversant ladite première poche ;
- chaque au moins dite conduite reliant ladite seconde poche audit générateur de gaz est constituée par un tuyau souple contournant latéralement ladite première poche ;
- le nombre et les diamètres des orifices de gonflage des dites poches sont prédéfinis de sorte à permettre une gestion différenciée de la quantité de gaz pénétrant à l’intérieur de ces dernières, de sorte que ladite première poche se gonfle plus rapidement que ladite seconde poche ;
- le temps de gonflage de ladite première poche est compris entre 5 et 7 ms tandis que celui de ladite seconde poche est compris entre 10 et 20 ms ;
- ladite première poche est dotée d’au moins un orifice de gonflage respectif relié fluidiquement à la sortie dudit générateur de gaz par une conduite correspondante, lesdites première et seconde poches étant en outre reliées fluidiquement l’une à l’autre par l’intermédiaire d’au moins un évent calibré pour s’ouvrir lorsque la pression régnant dans ladite première poche atteint un pourcentage prédéterminé de sa pression de gonflage ;
- ledit pourcentage prédéterminé est compris entre 80 et 100 % et/ou ;
- chaque au moins dite évent reliant fluidiquement lesdites poches est constitué par une pièce de tissu rapportée par couture fusible sur une ouverture ménagée sur une surface dudit sac séparant lesdites poches.According to preferred characteristics of the airbag according to the invention:
- the inflation pressure of said first pocket is between 1.10 and 1.15 bar, while that of said second pocket is between 1.25 and 1.35 bar;
- Said first pocket and said second pocket are each provided with at least one respective inflation orifice fluidically connected to the outlet of said gas generator by a corresponding pipe;
- Each at least said conduit fluidly connecting said second pocket to said gas generator is constituted by a flexible pipe passing through said first pocket;
- Each at least said pipe connecting said second pocket to said gas generator consists of a flexible pipe laterally bypassing said first pocket;
- the number and the diameters of the inflation orifices of the said pockets are predefined so as to allow a differentiated management of the quantity of gas penetrating inside the latter, so that the said first pocket inflates more quickly than the said second pocket ;
- the inflation time of said first pocket is between 5 and 7 ms while that of said second pocket is between 10 and 20 ms;
- said first pocket is provided with at least one respective inflation orifice fluidically connected to the outlet of said gas generator by a corresponding pipe, said first and second pockets being further fluidically connected to each other via at least one vent calibrated to open when the pressure in said first pocket reaches a predetermined percentage of its inflation pressure;
- said predetermined percentage is between 80 and 100% and/or;
- each at least said vent fluidically connecting said pockets consists of a piece of fabric added by fusible stitching on an opening formed on a surface of said bag separating said pockets.
L’exposé de l’invention sera maintenant poursuivi par la description détaillée d’un exemple de réalisation, donnée ci-après à titre illustratif mais non limitatif, en référence aux dessins annexés, sur lesquels :The description of the invention will now be continued with the detailed description of an embodiment, given below by way of illustration but not limitation, with reference to the appended drawings, in which:
L’ensemble de direction 1 représenté schématiquement sur la figure 1 comporte essentiellement une colonne de direction 2 susceptible d'être entraînée en rotation autour de son axe par un volant de manœuvre 3 monté à son sommet.The steering assembly 1 represented schematically in FIG. 1 essentially comprises a steering column 2 capable of being rotated about its axis by a maneuvering wheel 3 mounted at its top.
Cette colonne de direction 2 tourne sur des paliers disposés à l'intérieur d'un fût ou similaire (non représenté), permettant le montage de l'ensemble de direction sur le châssis du véhicule d'une façon qui est en elle-même classique et qu'il n'est donc pas nécessaire de décrire ici.This steering column 2 rotates on bearings arranged inside a barrel or the like (not shown), allowing the mounting of the steering assembly on the vehicle chassis in a manner which is conventional in itself. and therefore need not be described here.
Le volant de manœuvre 3 comprend de façon usuelle une jante de préhension et d'entraînement 4, ainsi qu’un un moyeu central creux 5 solidaire de la jante 4 et recouvert par une coiffe externe 6.The maneuvering wheel 3 usually comprises a gripping and drive rim 4, as well as a hollow central hub 5 secured to the rim 4 and covered by an outer cap 6.
L’ensemble de direction 1 comporte également un coussin gonflable de sécurité pour conducteur 10 selon l’invention, logé dans sa configuration non déployé à l’intérieur du moyeu 5 du volant 3 de sorte à être dissimulé des yeux des passagers du véhicule par la coiffe externe 6.The steering assembly 1 also comprises an airbag for the driver 10 according to the invention, housed in its undeployed configuration inside the hub 5 of the steering wheel 3 so as to be concealed from the eyes of the passengers of the vehicle by the outer cap 6.
Dans la description qui va suivre et par convention, les termes « avant » et « arrière » seront définis par rapport à la position de montage du coussin gonflable de sécurité 10 dans l’habitacle d’un véhicule automobile.In the following description and by convention, the terms "front" and "rear" will be defined with respect to the mounting position of the airbag 10 in the passenger compartment of a motor vehicle.
Ce coussin gonflable de sécurité 10 comporte classiquement un sac gonflable 11 ainsi qu’un générateur de gaz 12 (ce générateur étant représenté schématiquement sur la figure 1) comprenant une cartouche pyrotechnique rigide de forme globalement cylindrique dans laquelle se trouvent des réactifs permettant la génération de gaz et un déclencheur commandé électriquement.This airbag 10 conventionally comprises an inflatable bag 11 as well as a gas generator 12 (this generator being represented schematically in FIG. 1) comprising a rigid pyrotechnic cartridge of generally cylindrical shape in which there are reagents allowing the generation of gas and an electrically controlled trigger.
Le générateur de gaz 12 et le sac gonflable 11 replié par pliage, roulage ou compression sont logés dans une enveloppe non visible sur les figures et formée par exemple par un sac de toile ou un boîtier.The gas generator 12 and the inflatable bag 11 folded by folding, rolling or compression are housed in an envelope not visible in the figures and formed for example by a canvas bag or a casing.
Le générateur de gaz 12 comprend à l’une de ses extrémités, un connecteur électrique sortant de l’enveloppe et permettant de raccorder électriquement le déclencheur au réseau électrique du véhicule afin d’assurer la commande du coussin gonflable de sécurité 10.The gas generator 12 comprises at one of its ends, an electrical connector coming out of the casing and making it possible to electrically connect the trigger to the electrical network of the vehicle in order to ensure the control of the airbag 10.
Lors du déclenchement du coussin gonflable de sécurité 10 par l’émission d’un signal électrique généré lors d’une collision frontale du véhicule avec un autre véhicule ou un obstacle tel que par exemple un poteau, le générateur de gaz 12 envoie du gaz sous pression à l’intérieur du sac gonflable 11 qui se déploie en écartant la coiffe externe 6 tel qu’illustré sur la figure 2.When the airbag 10 is triggered by the emission of an electrical signal generated during a frontal collision of the vehicle with another vehicle or an obstacle such as for example a pole, the gas generator 12 sends gas under pressure inside the inflatable bag 11 which deploys by pushing aside the outer cap 6 as shown in Figure 2.
Selon l’invention et comme illustré sur cette figure 2, le sac gonflable 11 comprend une poche interne 111 apte, lors du déclenchement du coussin gonflable 10, à se déployer contre et à l’arrière du volant 3, ainsi qu’une poche externe 112 apte, lors du déclenchement de ce même coussin gonflable 10, à se déployer en périphérie externe de la poche interne 111 entre cette dernière et le buste du conducteur.According to the invention and as illustrated in this figure 2, the airbag 11 comprises an internal pocket 111 able, when the airbag 10 is triggered, to deploy against and at the rear of the steering wheel 3, as well as an external pocket 112 able, when this same airbag 10 is triggered, to deploy on the outer periphery of the inner pocket 111 between the latter and the driver's chest.
La pression de gonflage de la poche externe 112 est de préférence légèrement inférieure à 1,2 bar correspondant à la pression de la poche unique d’un coussin gonflable pour conducteur conforme à l’art antérieur, de sorte à permettre une course d’enfoncement satisfaisante du buste (et en particulier de la tête) du conducteur assurant un bon amortissement du choc, y compris pour un conducteur de faible corpulence tel qu’illustré sur la figure 3 avec un mannequin test 5èmepercentile M5.The inflation pressure of the outer pocket 112 is preferably slightly less than 1.2 bar corresponding to the pressure of the single pocket of a driver's airbag according to the prior art, so as to allow a depression stroke satisfactory bust (especially of the head) of the conductor ensuring a good shock absorption, including a low corpulence driver as shown in Figure 3 with a test manikin 5th percentile M5.
En pratique, cette pression de gonflage de la poche externe 112 sera avantageusement comprise entre 1,10 et 1,15 bar.In practice, this inflation pressure of the outer pocket 112 will advantageously be between 1.10 and 1.15 bar.
Par ailleurs, la pression de gonflage de la poche externe 112 est inférieure à celle de la poche interne 111, de sorte que cette dernière limite la course d’enfoncement du buste pour un conducteur de forte corpulence afin d’éviter que sa tête ne traverse entièrement le sac gonflable et ne vienne percuter le volant, tel qu’illustré sur la figure 4 avec un mannequin test 95èmepercentile M95.Furthermore, the inflation pressure of the outer pocket 112 is lower than that of the inner pocket 111, so that the latter limits the stroke of the bust for a driver of large build in order to prevent his head from crossing fully the airbag and strikes the steering wheel as shown in Figure 4 with a test dummy 95 th percentile M95.
Sur cette figure, on peut constater en effet que la tête du mannequin 95èmepercentile est tout d’abord amortie par la poche externe 112 dans laquelle elle s’enfonce sur toute sa profondeur, puis par la poche interne 111 de pression plus élevée dans laquelle elle s’enfonce seulement partiellement.In this figure, it can be seen in fact that the head of the 95th percentile dummy is first damped by the outer pouch 112 in which it is pressed over its entire depth, and subsequently by the inner bag 111 of higher pressure in which it sinks only partially.
Au moment de l’impact avec cette poche interne 111, l’énergie cinétique résiduelle du buste du conducteur est nettement inférieure à son énergie cinétique initiale à l’instant du choc car une bonne partie d’entre elle a déjà été absorbée par la poche externe 112. Ainsi, bien que la pression de cette poche interne 111 soit plus grande (celle-ci ayant ainsi une raideur plus importante), l’impact ressenti par le conducteur est fortement atténué (disparition de l’effet « gifle » et des risques de contusions faciales y étant associés).At the moment of impact with this internal pocket 111, the residual kinetic energy of the driver's chest is significantly lower than its initial kinetic energy at the instant of impact because a good part of it has already been absorbed by the pocket. external 112. Thus, although the pressure of this internal pocket 111 is greater (the latter thus having greater stiffness), the impact felt by the driver is greatly reduced (disappearance of the "slap" effect and of the associated risk of facial bruising).
La pression de gonflage de la poche interne 111 sera de préférence comprise entre 1,25 et 1,35 bar.The inflation pressure of the internal pocket 111 will preferably be between 1.25 and 1.35 bar.
La poche interne 111 et la poche externe 112 sont dotées chacune d’au moins un orifice de gonflage respectif relié fluidiquement à la sortie du générateur de gaz 12 par une conduite correspondante.The inner pocket 111 and the outer pocket 112 are each provided with at least one respective inflation orifice fluidically connected to the outlet of the gas generator 12 by a corresponding pipe.
Dans le mode de réalisation représenté sur la figure 2, la poche externe 112 comprend un orifice unique de gonflage reliée au générateur de gaz 12 un tuyau souple 13 traversant la poche interne 111.In the embodiment shown in Figure 2, the outer pocket 112 comprises a single inflation port connected to the gas generator 12 a flexible pipe 13 passing through the inner pocket 111.
Réalisé avantageusement en nylon 6-6, ce tuyau souple présente de préférence un diamètre interne compris entre 5 et 7 mm, et une épaisseur comprise entre 1 et 1,5 mm.Advantageously made of nylon 6-6, this flexible pipe preferably has an internal diameter of between 5 and 7 mm, and a thickness of between 1 and 1.5 mm.
Selon des variantes de réalisation non représentées, la poche externe 112 comprend plusieurs orifices de gonflage reliés fluidiquement à la sortie du générateur de gaz 12 par des tuyaux souples traversant 13 espacés les uns des autres de sorte à assurer un gonflage homogène de la poche externe 112.According to variant embodiments not shown, the outer pocket 112 comprises several inflation orifices fluidly connected to the outlet of the gas generator 12 by flexible pipes passing through 13 spaced from each other so as to ensure homogeneous inflation of the outer pocket 112 .
Selon d’autres variantes de réalisation non représentées, le ou les conduites reliant fluidiquement la poche externe 112 à la sortie du générateur de gaz 12 sont constituées par un ou plusieurs tuyaux souples contournant latéralement la poche interne 111.According to other variant embodiments not shown, the pipe(s) fluidically connecting the external pocket 112 to the outlet of the gas generator 12 consist of one or more flexible pipes laterally bypassing the internal pocket 111.
D’une manière générale, le nombre et les diamètres des orifices de gonflage des deux poches 111, 112 sont prédéfinis de sorte à permettre une gestion différenciée de la quantité de gaz pénétrant à l’intérieur de ces deux poches, de sorte que la poche interne 111 se gonfle plus rapidement que l’autre (par exemple entre 5 et 7 ms pour la poche interne 111 et entre 10 et 20 ms pour la poche externe 112).In general, the number and the diameters of the inflation orifices of the two pockets 111, 112 are predefined so as to allow differentiated management of the quantity of gas penetrating inside these two pockets, so that the pocket internal 111 inflates more quickly than the other (for example between 5 and 7 ms for the internal pocket 111 and between 10 and 20 ms for the external pocket 112).
Afin de s’assurer que le déploiement des deux poches 111, 112 démarre simultanément, ces dernières sont repliées séparément l’une de l’autre.In order to ensure that the deployment of the two pockets 111, 112 starts simultaneously, the latter are folded separately from each other.
La figure 5 illustre un deuxième mode de réalisation de l’invention dans laquelle seule la poche interne 111 comprend un orifice de gonflage relié fluidiquement à la sortie du générateur de gaz 12. Les deux poches 111 et 112 sont en outre reliées fluidiquement l’une à l’autre par l’intermédiaire d’au moins un évent 14, ici de type soupape, calibré pour s’ouvrir lorsque la pression régnant dans la poche interne atteint un pourcentage prédéterminé (compris avantageusement entre 80 et 100 %) de sa pression de gonflage.FIG. 5 illustrates a second embodiment of the invention in which only the internal pocket 111 comprises an inflation orifice fluidically connected to the outlet of the gas generator 12. The two pockets 111 and 112 are further fluidically connected to each other. to the other via at least one vent 14, here of the valve type, calibrated to open when the pressure prevailing in the internal pocket reaches a predetermined percentage (advantageously comprised between 80 and 100%) of its pressure inflation.
Le coussin gonflable 10 comporte de préférence une pluralité d’évents 14 espacés les uns des autres de sorte à assurer un gonflage homogène de la poche externe.The airbag 10 preferably comprises a plurality of vents 14 spaced apart from each other so as to ensure uniform inflation of the outer pocket.
Selon des variantes de réalisation non représentées, chaque évent peut être constitué par une simple pièce de tissu rapportée par couture fusible sur une ouverture ménagée sur une surface du sac 11 séparant les deux poches 111, 112.According to variant embodiments not shown, each vent may consist of a simple piece of fabric added by fusible stitching to an opening made on a surface of the bag 11 separating the two pockets 111, 112.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1904538A FR3095622B1 (en) | 2019-04-30 | 2019-04-30 | Driver's airbag with two pockets |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1904538A FR3095622B1 (en) | 2019-04-30 | 2019-04-30 | Driver's airbag with two pockets |
| FR1904538 | 2019-04-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR3095622A1 true FR3095622A1 (en) | 2020-11-06 |
| FR3095622B1 FR3095622B1 (en) | 2021-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR1904538A Active FR3095622B1 (en) | 2019-04-30 | 2019-04-30 | Driver's airbag with two pockets |
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| Country | Link |
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| FR (1) | FR3095622B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3133570A1 (en) * | 2022-03-16 | 2023-09-22 | Psa Automobiles Sa | Headrest for vehicle seat equipped with an anti-whiplash protection cushion |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3476402A (en) * | 1966-08-03 | 1969-11-04 | Daimler Benz Ag | Inflatable container for the protection of passengers of vehicles,especially of motor vehicles,against impact injuries in case of collisions |
| DE3630685A1 (en) | 1986-07-22 | 1988-02-04 | Trw Repa Gmbh | GAS PILLOW IMPACT PROTECTION DEVICE FOR MOTOR VEHICLES |
| US6260877B1 (en) * | 1999-12-30 | 2001-07-17 | William J. Rasmussen, Sr. | Soft shell air bag |
| US20050173897A1 (en) * | 2004-02-06 | 2005-08-11 | Takata Corporation | Airbag apparatus |
-
2019
- 2019-04-30 FR FR1904538A patent/FR3095622B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3476402A (en) * | 1966-08-03 | 1969-11-04 | Daimler Benz Ag | Inflatable container for the protection of passengers of vehicles,especially of motor vehicles,against impact injuries in case of collisions |
| DE3630685A1 (en) | 1986-07-22 | 1988-02-04 | Trw Repa Gmbh | GAS PILLOW IMPACT PROTECTION DEVICE FOR MOTOR VEHICLES |
| US6260877B1 (en) * | 1999-12-30 | 2001-07-17 | William J. Rasmussen, Sr. | Soft shell air bag |
| US20050173897A1 (en) * | 2004-02-06 | 2005-08-11 | Takata Corporation | Airbag apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3133570A1 (en) * | 2022-03-16 | 2023-09-22 | Psa Automobiles Sa | Headrest for vehicle seat equipped with an anti-whiplash protection cushion |
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| Publication number | Publication date |
|---|---|
| FR3095622B1 (en) | 2021-04-02 |
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