WO2007093302A1 - Airbag unit - Google Patents

Airbag unit Download PDF

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Publication number
WO2007093302A1
WO2007093302A1 PCT/EP2007/000978 EP2007000978W WO2007093302A1 WO 2007093302 A1 WO2007093302 A1 WO 2007093302A1 EP 2007000978 W EP2007000978 W EP 2007000978W WO 2007093302 A1 WO2007093302 A1 WO 2007093302A1
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WO
WIPO (PCT)
Prior art keywords
gas
unit according
airbag unit
airbag
connecting line
Prior art date
Application number
PCT/EP2007/000978
Other languages
German (de)
French (fr)
Inventor
Andreas Immler
Original Assignee
Autoliv Development Ab
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 Autoliv Development Ab filed Critical Autoliv Development Ab
Publication of WO2007093302A1 publication Critical patent/WO2007093302A1/en

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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
    • 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
    • B60R2021/23316—Inner seams, e.g. creating separate compartments or used as tethering means
    • 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

Definitions

  • the invention relates to an airbag unit according to the preamble of claim 1.
  • the generic DE 20 2005 003 280 U1 describes an airbag unit with a curtain airbag and a gas generator unit filling this curtain airbag.
  • the gas bag unit here has a T-shaped connecting piece, whose two outflow nozzles extend in the longitudinal direction of the curtain airbag.
  • gas flows in two directions into the curtain gas bag, so that it can be filled uniformly and quickly. Since it is generally required that gas generator units behave shock-neutral, it is necessary that the two outlets supply the same amount of gas.
  • a side airbag unit has become known in which the gas generator unit is located completely inside the airbag and wherein the two side walls of the airbag are connected to each other in a region adjacent to the outflow openings of the gas generator unit by means of a seam.
  • This seam is directly flowed by the gas generator and divides the gas flow into two partial streams, which can also be asymmetric.
  • the seam must be relatively strong in order to withstand the gas flow over the entire operating time of the gas generator can. The load on the seam thus increases with the volume of the gas bag to be filled.
  • a mostly relatively large curtain airbag that it is filled asymmetrically. This may be the case in particular if the opening through which the outflow region of the gas generator unit projects into the gas space lies in the region of a feed section which connects two protective sections of the gas bag.
  • the present invention has the object to develop a generic airbag unit to the effect that an asymmetric distribution of the gas within the airbag achieved while a punctual high load on the airbag shell and seams can be avoided.
  • gas guiding means which divert the inflowing gas asymmetrically.
  • the gas guiding means comprise a flow channel formed between a connecting line along which the two side walls are joined together and a portion of the edge.
  • the manufacturing overhead compared to a gas bag without this feature is relatively low and you need except thread no additional material.
  • the flow resistance is not significantly increased.
  • a very low flow resistance can be achieved.
  • a second flow channel is provided, which extends parallel to the first flow channel. The asymmetry of the gas flow is determined by the gas flow in this second flow channel. In this case, in particular, an effect can be exploited, as known for example from water jet pumps.
  • FIG. 1 shows a curtain gas bag in longitudinal section
  • FIG. 2 shows a gas supply with an outflow region
  • Figure 3 shows a detail of Figure 1 with introduced outflow
  • FIG. 4 shows a further exemplary embodiment of a curtain gas bag in a representation corresponding to FIG.
  • FIG. 1 shows a curtain airbag 10.
  • This curtain airbag 10 is sewn together from a fabric blank having two side walls, wherein only one side wall 12 is shown due to the illustration.
  • the gas bag has two protective sections 16a, 16b and a feed section 18, which connects the two protective sections 16a, 16b to one another.
  • the two side walls are along an edge which surrounds the gas space with each other connected. This edge is formed in this embodiment by the lower folding edge and by the edge seam 15.
  • the supply section 18 extends along the upper edge 12a, which also has the opening 14 for the discharge area of a gas generator unit.
  • a connecting line and a connecting portion are provided, which connect the side walls together and form the Gasleitsch provided.
  • the connecting line is formed by the first seam 21, which connects the two side walls, and which forms a first flow channel 25 together with an upper, central portion 15a of the peripheral seam 15 surrounding the gas space.
  • first seam 21 is another section 15b of the edge seam, which separates the feed section 18 from a non-inflatable region. Between the first seam 21 and the further portion 15b, a second flow channel 26 is thereby formed.
  • a second seam 22, which has a substantially circular shape, is located in an extension line of the first seam 21 at the transition between feed section 18 and rear protective section 16a and forms the further connection region.
  • an end section of the gas generator unit shown in FIG. 2 extends through the opening 14 and has the outflow region 32 with two outflow openings 34 arranged in a thrust-neutral manner.
  • the gas generator unit consists of the supply pipe 31 having the discharge area and the gas generating area 36 received in the supply pipe 31.
  • FIG. 3 shows the mounted state in which the end section of the gas generator unit extends through the opening 14.
  • the outflow area is in this case within the first flow channel 25, but at one of his - here the rear - ends.
  • the operation of the flow guide will now be explained with reference to Figure 3:
  • the gas coming from the gas generator flows from the two opposing exhaust ports 34 initially symmetrically in the longitudinal direction L of the curtain gas bag from the outflow area.
  • the one part passes into the first flow channel 25, while the other part flows in the direction of the rear protection section 16a.
  • he is something dammed up by the second seam 22 and in the first zone Zi creates the highest pressure within the gas space.
  • a second zone Z 2 is formed at low pressure due to known dynamic effects (chimney effect).
  • a pressure difference prevails between the two ends of the second flow channel 26, as a result of which part of the gas initially flowed in the direction of the front protection zone flows through the second flow channel 26 in the direction of the first protection section 16a, resulting in an asymmetrical distribution of the gas flow.
  • the ratio of the two gas streams which is exemplified here, of course depends on the specific geometry. For the gas flow through the second flow channel here two mutually reinforcing effects are responsible, but it should be emphasized that each effect would also lead to an overall asymmetric gas distribution.
  • the embodiment of the invention just described which has two parallel flow channels, is characterized in that the flow resistance only has to be increased slightly. In particular, it can be avoided that one of the gas flows immediately after exiting one of the two outflow openings, a gas guide element.
  • FIG. 4 shows a further exemplary embodiment.
  • one gas guide element in the form of the first seam 21 is present, which extends obliquely with respect to the edge section 12a.
  • the first flow channel 25 formed in this way is conical and, by its very form alone, leads to an asymmetrical distribution of the gas flow; a second flow channel would not necessarily be required here. Again, the two outflow openings are within the first flow channel in the assembled state. This embodiment is seen Lich of the flow resistance is not quite as low as the first shown, comes with only one additional seam.
  • a great advantage of the embodiments described here is that the position of the outflow region in the first flow channel is precisely defined at each point in time of the expansion.

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

Abstract

The invention relates to an airbag unit consisting of an airbag jacket that surrounds a gas chamber and has two essentially rectangular side walls, which are joined together along one edge, the airbag jacket having an opening, and a gas generator unit comprising a gas production region, which is located outside the airbag, and an outflow region (32), which is located inside the gas chamber and has at least two outflow openings that produce a neutral impetus. The gas generator unit protrudes through the opening into the gas chamber. The aim of the invention is to produce an asymmetrical gas distribution inside the airbag. To achieve this, gas conduction elements, which asymmetrically deflect the incoming flow of gas, are provided in a region that adjoins the opening, said gas conduction elements comprising a first connection line, along which the two side walls are joined and said connection line and a first section of the edge forming a first flow channel (25), which contains the outflow region (32).

Description

Gassack-Einheit Airbag unit
Beschreibungdescription
Technisches Gebiet der ErfindungTechnical field of the invention
Die Erfindung betrifft eine Gassack-Einheit nach dem Oberbegriff des Anspruchs 1.The invention relates to an airbag unit according to the preamble of claim 1.
Stand der TechnikState of the art
In der gattungsbildenden DE 20 2005 003 280 U1 ist eine Gassack-Einheit mit einem Vorhanggassack und einer diesen Vorhanggassack befüllenden Gasgene- rator-Einheit beschrieben. Die Gassack-Einheit weist hier ein T-förmiges Verbindungsstück auf, dessen beide Ausströmstutzen sich in Längsrichtung des Vorhanggassackes erstrecken. Hierdurch strömt Gas in zwei Richtungen in den Vorhang-Gassack ein, so dass dieser gleichmäßig und schnell befüllt werden kann. Da es im allgemeinen gefordert wird, dass sich Gasgeneratoreinheiten schub- neutral verhalten, ist es erforderlich, dass die beiden Ausströmstutzen dieselbe Gasmenge liefern.The generic DE 20 2005 003 280 U1 describes an airbag unit with a curtain airbag and a gas generator unit filling this curtain airbag. The gas bag unit here has a T-shaped connecting piece, whose two outflow nozzles extend in the longitudinal direction of the curtain airbag. As a result, gas flows in two directions into the curtain gas bag, so that it can be filled uniformly and quickly. Since it is generally required that gas generator units behave shock-neutral, it is necessary that the two outlets supply the same amount of gas.
Durch die DE 103 21 066 A1 ist eine Seitengassack-Einheit bekannt geworden, bei der sich die Gasgeneratoreinheit vollständig innerhalb des Gassacks befindet und wobei die beiden Seitenwände des Gassacks in einem zu den Ausströmöffnungen der Gasgeneratoreinheit benachbarten Bereich mittels einer Naht miteinander verbunden sind. Diese Naht wird vom Gasgenerator direkt angeströmt und und teilt den Gasstrom in zwei Teilströme, was auch asymmetrisch erfolgen kann. Die Naht muss relativ stark ausgebildet sein, um dem Gasstrom über die gesamte Betätigungszeit des Gasgenerators standhalten zu können. Die Belastung der Naht steigt demnach mit dem zu befüllenden Volumen des Gassacks an. Geαenstand der ErfindungFrom DE 103 21 066 A1 a side airbag unit has become known in which the gas generator unit is located completely inside the airbag and wherein the two side walls of the airbag are connected to each other in a region adjacent to the outflow openings of the gas generator unit by means of a seam. This seam is directly flowed by the gas generator and divides the gas flow into two partial streams, which can also be asymmetric. The seam must be relatively strong in order to withstand the gas flow over the entire operating time of the gas generator can. The load on the seam thus increases with the volume of the gas bag to be filled. The present invention
In manchen Anwendungsfällen ist es auch bei einem zumeist relativ großvolumi- gen Vorhanggassack wünschenswert, dass dieser asymmetrisch befüllt wird. Dies kann insbesondere dann der Fall sein, wenn sich die Öffnung, durch welche der Ausströmbereich der Gasgeneratoreinheit in den Gasraum ragt, im Bereich eines Zuführabschnittes, welcher zwei Schutzabschnitte des Gassacks miteinander verbindet, liegt.In some applications, it is also desirable for a mostly relatively large curtain airbag that it is filled asymmetrically. This may be the case in particular if the opening through which the outflow region of the gas generator unit projects into the gas space lies in the region of a feed section which connects two protective sections of the gas bag.
Hiervon ausgehend stellt sich die vorliegende Erfindung die Aufgabe, eine gattungsgemäße Gassack-Einheit dahingehend weiterzubilden, dass eine asymmetrische Verteilung des Gases innerhalb des Gassacks erreicht und gleichzeitig eine punktuell hohe Belastung der Gassackhülle und Nähten vermieden werden kann.On this basis, the present invention has the object to develop a generic airbag unit to the effect that an asymmetric distribution of the gas within the airbag achieved while a punctual high load on the airbag shell and seams can be avoided.
Diese Aufgabe wird durch eine Gassack-Einheit mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by an airbag unit with the features of claim 1.
Erfindungsgemäß sind in dem Bereich des Gasraums, der sich an die Öffnung, durch die der Ausströmbereich der Gasgeneratoreinheit ragt, anschließt, Gasleitmittel vorgesehen, welche das einströmende Gas asymmetrisch umlenken. Die Gasleitmittel umfassen einen Strömungskanal, der zwischen einer Verbindungslinie, entlang derer die beiden Seitenwände miteinander verbunden sind, und einem Abschnitt des Randes gebildet ist. Durch asymmetrische Anordnung des Ausströmbereichs innerhalb des Strömungskanals, asymmetrisches Ausbildung des Strömungskanals selbst oder Anordnen eines weiteren Verbindungsbereichs, insbesondere außerhalb des Strömungskanals, kann eine asymmetrische Verteilung des Gasstroms erreicht werden, ohne Gassackgewebe oder Nähte direkt anströmen zu müssen. Hierzu ist es insbesondere zu bevorzugen, dass der Aus- Strömbereich der Gasgeneratoreinheit gemäß Anspruch 10 ausgebildet ist. Der fertigungstechnische Mehraufwand gegenüber einem Gassack ohne dieses Merkmal ist vergleichsweise gering und man benötigt außer Faden kein zusätzliches Material. Durch die erfindungsgemäße Leitung des Gasstroms wird der Strömungswiderstand nicht-wesentlich erhöht. Insbesondere mit einer Ausgestaltung gemäß Anspruch 7 kann ein sehr geringer Strömungswiderstand erreicht werden. In dieser Ausführungsform ist ein zweiter Strömungskanal vorgesehen, der sich parallel zum ersten Strömungskanal erstreckt. Die Asymmetrie des Gasflusses wird durch den Gasstrom in diesem zweiten Strömungskanal bestimmt. Hierbei kann insbesondere auch ein Effekt ausgenutzt werden, wie man ihn beispielsweise aus Wasserstrahlpumpen kennt.According to the invention, in the region of the gas space which adjoins the opening through which the outflow region of the gas generator unit projects, gas guiding means are provided which divert the inflowing gas asymmetrically. The gas guiding means comprise a flow channel formed between a connecting line along which the two side walls are joined together and a portion of the edge. By asymmetric arrangement of the outflow within the flow channel, asymmetric formation of the flow channel itself or arranging a further connection region, in particular outside the flow channel, an asymmetric distribution of the gas stream can be achieved without having to flow directly to gas bag fabric or seams. For this purpose, it is in particular to be preferred that the outflow region of the gas generator unit is designed according to claim 10. The manufacturing overhead compared to a gas bag without this feature is relatively low and you need except thread no additional material. By the inventive line of the gas flow, the flow resistance is not significantly increased. In particular, with an embodiment according to claim 7, a very low flow resistance can be achieved. In this embodiment, a second flow channel is provided, which extends parallel to the first flow channel. The asymmetry of the gas flow is determined by the gas flow in this second flow channel. In this case, in particular, an effect can be exploited, as known for example from water jet pumps.
Weitere bevorzugte Ausführungsformen ergeben sich aus den Ausführungsbeispielen und aus den weiteren Unteransprüchen.Further preferred embodiments will become apparent from the embodiments and from the other dependent claims.
Die Erfindung wird nun anhand von Ausführungsbeispielen mit Bezug auf die Fi- guren näher erläutert. Hierbei zeigen:The invention will now be explained in more detail by means of exemplary embodiments with reference to the figures. Hereby show:
Kurzbeschreibung der ZeichnungenBrief description of the drawings
Figur 1 Einen Vorhanggassack im Längsschnitt, Figur 2 eine Gaszuführung mit einem Ausströmbereich,FIG. 1 shows a curtain gas bag in longitudinal section, FIG. 2 shows a gas supply with an outflow region,
Figur 3 einen Ausschnitt aus Figur 1 mit eingeführtem Ausströmbereich undFigure 3 shows a detail of Figure 1 with introduced outflow and
Figur 4 ein weiteres Ausführungsbeispiel eines Vorhanggassacks in einer der Figur 1 entsprechenden Darstellung.FIG. 4 shows a further exemplary embodiment of a curtain gas bag in a representation corresponding to FIG.
Beschreibung bevorzugter AusführungsformenDescription of preferred embodiments
Die Figur 1 zeigt einen Vorhanggassack 10. Dieser Vorhanggassack 10 ist aus einem zwei Seitenwänden aufweisenden Gewebezuschnitt zusammengenäht, wobei aufgrund der Darstellung lediglich die eine Seitenwand 12 dargestellt ist. Der Gassack weist zwei Schutzabschnitte 16a, 16b und einen Zuführabschnitt 18 auf, der die beiden Schutzabschnitte 16a, 16b miteinander verbindet. Die beiden Seitenwände sind entlang eines Randes, der den Gasraum umgibt, miteinander verbunden. Dieser Rand wird in diesem Ausführungsbeispiel durch die untere Faltkante und durch die Randnaht 15 gebildet.FIG. 1 shows a curtain airbag 10. This curtain airbag 10 is sewn together from a fabric blank having two side walls, wherein only one side wall 12 is shown due to the illustration. The gas bag has two protective sections 16a, 16b and a feed section 18, which connects the two protective sections 16a, 16b to one another. The two side walls are along an edge which surrounds the gas space with each other connected. This edge is formed in this embodiment by the lower folding edge and by the edge seam 15.
Der Zuführabschnitt 18 erstreckt sich entlang der oberen Kante 12a, welche auch die Öffnung 14 für den Ausströmbereich einer Gasgeneratoreinheit aufweist. In einem sich an diese Öffnung 14 anschließenden Bereich des Gasraumes, hier im wesentlichen innerhalb des Zuführabschnittes 18, sind eine Verbindungslinie und ein Verbindungsbereich vorgesehen, welche die Seitenwände miteinander verbinden und die Gasleitmittel bilden, vorgesehen. Die Verbindungslinie ist durch die erste Naht 21 gebildet, welche die beiden Seitenwände verbindet, und welche gemeinsam mit einem oberen, mittleren Abschnitt 15a der den Gasraum umgebenden Randnaht 15 einen ersten Strömungskanal 25 bildet.The supply section 18 extends along the upper edge 12a, which also has the opening 14 for the discharge area of a gas generator unit. In a subsequent to this opening 14 region of the gas space, here substantially within the feed section 18, a connecting line and a connecting portion are provided, which connect the side walls together and form the Gasleitmittel provided. The connecting line is formed by the first seam 21, which connects the two side walls, and which forms a first flow channel 25 together with an upper, central portion 15a of the peripheral seam 15 surrounding the gas space.
Unterhalb dieser ersten Naht 21 befindet sich ein weiterer Abschnitt 15b der Randnaht, welcher den Zuführabschnitt 18 von einem nicht aufblasbaren Bereich trennt. Zwischen der ersten Naht 21 und dem weiteren Abschnitt 15b ist hierdurch ein zweiter Strömungskanal 26 gebildet. Eine zweite Naht 22, welche im wesentlichen kreisförmig ausgeführt ist, befindet sich in einer Verlängerungslinie der ersten Naht 21 am Übergang zwischen Zuführabschnitt 18 und hinterem Schutzab- schnitt 16a und bildet den weiteren Verbindungsbereich.Below this first seam 21 is another section 15b of the edge seam, which separates the feed section 18 from a non-inflatable region. Between the first seam 21 and the further portion 15b, a second flow channel 26 is thereby formed. A second seam 22, which has a substantially circular shape, is located in an extension line of the first seam 21 at the transition between feed section 18 and rear protective section 16a and forms the further connection region.
Im montierten Zustand erstreckt sich durch die Öffnung 14 ein in Figur 2 dargestellter Endabschnitt der Gasgeneratoreinheit, welcher den Ausströmbereich 32 mit zwei schubneutral angeordneten Ausströmöffnungen 34 aufweist. Die Gas- generatoreinheit besteht aus dem den Ausströmbereich aufweisenden Zufuhrrohr 31 und dem im Zufuhrrohr 31 aufgenommenen Gaserzeuguungsbereich 36.In the mounted state, an end section of the gas generator unit shown in FIG. 2 extends through the opening 14 and has the outflow region 32 with two outflow openings 34 arranged in a thrust-neutral manner. The gas generator unit consists of the supply pipe 31 having the discharge area and the gas generating area 36 received in the supply pipe 31.
Figur 3 zeigt den montierten Zustand, in dem sich der Endabschnitt der Gasgenerator-Einheit durch die Öffnung 14 erstreckt. Der Ausströmbereich befindet sich hierbei innerhalb des ersten Strömungskanals 25, jedoch an einem seiner - hier dem hinteren - Enden. Die Funktionsweise der Strömungsleitelemente wird nun mit Bezug auf die Figur 3 erläutert: Das vom Gasgenerator kommende Gas strömt aus den beiden sich gegenüberliegenden Ausströmöffnungen 34 zunächst symmetrisch in der Längsrichtung L des Vorhanggassacks aus dem Ausström bereich aus. Der eine Teil gelangt in den ersten Strömungskanal 25, während der andere Teil in Richtung des hinteren Schutzabschnittes 16a strömt. Hierbei wird er etwas durch die zweite Naht 22 aufgestaut und in der ersten Zone Zi entsteht der höchste Druck innerhalb des Gasraums. Am Ende des ersten Strömungskanals 25 entsteht aufgrund bekannter strömungsdynamischer Effekte (Schornsteineffekt) eine zweite Zone Z2 mit geringem Druck. Zwischen den beiden Enden des zweiten Strömungskanals 26 herrscht also ein Druckunterschied, wodurch ein Teil des zunächst in Richtung des vorderen Schutzbereichs geströmten Gases durch den zweiten Strömungskanal 26 in Richtung des ersten Schutzabschnittes 16a strömt, wodurch sich insgesamt eine asymmetrische Aufteilung des Gasstroms ergibt. Das Verhältnis der beiden Gasströme, welches hier beispielhaft angegeben ist, richtet sich natürlich nach der speziellen Geometrie. Für den Gasstrom durch den zweiten Strömungskanal sind hier zwei sich gegenseitig verstärkende Effekte verantwortlich, wobei jedoch zu betonen ist, dass auch jeder Effekt für sich zu einer insgesamt asymmetrischen Gasverteilung führen würde.FIG. 3 shows the mounted state in which the end section of the gas generator unit extends through the opening 14. The outflow area is in this case within the first flow channel 25, but at one of his - here the rear - ends. The operation of the flow guide will now be explained with reference to Figure 3: The gas coming from the gas generator flows from the two opposing exhaust ports 34 initially symmetrically in the longitudinal direction L of the curtain gas bag from the outflow area. The one part passes into the first flow channel 25, while the other part flows in the direction of the rear protection section 16a. Here he is something dammed up by the second seam 22 and in the first zone Zi creates the highest pressure within the gas space. At the end of the first flow channel 25, a second zone Z 2 is formed at low pressure due to known dynamic effects (chimney effect). Thus, a pressure difference prevails between the two ends of the second flow channel 26, as a result of which part of the gas initially flowed in the direction of the front protection zone flows through the second flow channel 26 in the direction of the first protection section 16a, resulting in an asymmetrical distribution of the gas flow. The ratio of the two gas streams, which is exemplified here, of course depends on the specific geometry. For the gas flow through the second flow channel here two mutually reinforcing effects are responsible, but it should be emphasized that each effect would also lead to an overall asymmetric gas distribution.
Die eben beschriebene Ausführungsform der Erfindung, welche zwei zueinander parallele Strömungskanäle aufweist, zeichnet sich dadurch aus, dass der Strömungswiderstand nur wenig erhöht werden muss. Insbesondere kann es vermieden werden, dass einer der Gasströme unmittelbar nach Austreten aus einem der beiden Ausströmöffnungen ein Gasleitelement anströmt.The embodiment of the invention just described, which has two parallel flow channels, is characterized in that the flow resistance only has to be increased slightly. In particular, it can be avoided that one of the gas flows immediately after exiting one of the two outflow openings, a gas guide element.
Die Figur 4 zeigt ein weiteres Ausführungsbeispiel. Hier ist nur ein Gasleitelement in Form der ersten Naht 21 vorhanden, welche sich schräg bezüglich des Randabschnittes 12a erstreckt. Der so gebildete erste Strömungskanal 25 ist ko- nisch und führt schon allein durch seine Form zu einer asymmetrischen Verteilung des Gasstroms, ein zweiter Strömungskanal wäre hier nicht zwingend erforderlich. Auch hier befinden sich im montierten Zustand die beiden Ausströmöffnungen innerhalb des ersten Strömungskanals. Diese Ausführungsform ist hinsieht- lich des Strömungswiderstandes nicht ganz so günstig wie die zuerst dargestellte, kommt dafür mit nur einer zusätzlichen Naht aus.FIG. 4 shows a further exemplary embodiment. Here only one gas guide element in the form of the first seam 21 is present, which extends obliquely with respect to the edge section 12a. The first flow channel 25 formed in this way is conical and, by its very form alone, leads to an asymmetrical distribution of the gas flow; a second flow channel would not necessarily be required here. Again, the two outflow openings are within the first flow channel in the assembled state. This embodiment is seen Lich of the flow resistance is not quite as low as the first shown, comes with only one additional seam.
Ein großer Vorteil der hier beschriebenen Ausführungsformen ist, dass die Positi- on des Ausströmbereichs im ersten Strömungskanal zu jedem Zeitpunkt der Expansion genau definiert ist. A great advantage of the embodiments described here is that the position of the outflow region in the first flow channel is precisely defined at each point in time of the expansion.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
10 Vorhanggassack10 curtain airbag
12 Seitenwand12 side wall
12a Randabschnitt12a edge section
14 Öffnung14 opening
15 Randnaht15 edge seam
15a,b Abschnitte der Randnaht15a, b sections of the edge seam
16a,b Schutzabschnitt16a, b protection section
18 Zuführabschnitt18 feed section
19 Faltkante19 folding edge
21 erste Naht21 first seam
22 zweite Naht22 second seam
23 dritte Naht23 third seam
25 erster Strömungskanal25 first flow channel
26 zweiter Strömungskanal26 second flow channel
30 Gasgeneratoreinheit30 gas generator unit
31 Zufuhrrohr31 feed tube
32 Ausströmbereich32 outflow area
34 Ausströmöffnung34 outflow opening
36 Gaserzeugungsbereich36 gas generation area
Z1 erste ZoneZ 1 first zone
Z2 zweite Zone Z 2 second zone

Claims

Patentansprüche claims
1. Gassack-Einheit mit einer einen Gasraum umgebenden Gassackhülle mit zwei im wesentlichen rechteckigen Seitenwänden (12), die entlang eines Randes miteinander verbunden sind, wobei in der Gassackhülle eine Öffnung (14) vorgesehen ist, und einer Gasgeneratoreinheit mit einem außerhalb des Gassacks angeordneten Gaserzeugungsbereich (36) und einem innerhalb des Gasraums angeordneten Ausströmbereich (32) mit wenigstens zwei schubneutral angeordneten Ausströmöffnungen (34), wobei die Gasgeneratoreinheit durch die Öffnung in den Gasraum ragt, dadurch gekennzeichnet, dass in einem an die Öffnung (14) anschließenden Bereich des Gasraums Gasleitmittel vorgesehen sind, die das einströmende Gas asymmetrisch umlenken, wobei die Gasleitmittel eine erste Verbindungslinie, entlang derer die beiden Seitenwände miteinander ver- bunden sind, umfassen, und wobei die Verbindungslinie und ein erster Abschnitt des Randes einen ersten Strömungskanal (25) bilden, in welchem sich der Ausströmbereich (32) befindet.A gas bag unit having a gas bag envelope surrounding a gas space and having two substantially rectangular side walls (12) connected together along one edge, wherein an opening (14) is provided in the gas bag envelope, and a gas generator unit is disposed with one outside the gas bag Gas generating region (36) and an outflow region (32) arranged within the gas space with at least two outflow openings arranged thrust neutral, wherein the gas generator unit protrudes through the opening into the gas space, characterized in that in a region adjoining the opening (14) Gasraums gas guide means are provided which deflect the inflowing gas asymmetrically, wherein the Gasleitmittel a first connecting line, along which the two side walls are connected to each other, and wherein the connecting line and a first portion of the edge form a first flow channel (25), in which the Ausströmb Area (32) is located.
2. Gassack-Einheit nach Anspruch 1 , dadurch gekennzeichnet, dass die Ver- bindungslinie durch eine erste Naht (21 ) gebildet wird.2. Airbag unit according to claim 1, characterized in that the connection line is formed by a first seam (21).
3. Gassack-Einheit nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sich die Verbindungslinie parallel zum Randabschnitt erstreckt, so dass ein Strömungskanal mit konstantem Querschnitt gebildet wird.3. Airbag unit according to one of the preceding claims, characterized in that the connecting line extends parallel to the edge portion, so that a flow channel is formed with a constant cross-section.
4. Gassack-Einheit nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass sich die Verbindungslinie nicht parallel zum Randabschnitt erstreckt, so dass ein konischer Strömungskanal gebildet wird.4. Airbag unit according to claim 1 or claim 2, characterized in that the connecting line does not extend parallel to the edge portion, so that a conical flow channel is formed.
5. Gassack-Einheit nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sich an einem Ende des ersten Strömungskanals (25) ein weiterer Verbindungsbereich, in dem die beiden Seitenwände miteinander verbunden sind, befindet.5. Airbag unit according to one of the preceding claims, characterized in that at one end of the first flow channel (25) another connection area in which the two side walls are connected to each other is located.
6. Gassack-Einheit nach Anspruch 5, dadurch gekennzeichnet, dass der weitere Verbindungsbereich durch eine zweite Naht (22) gebildet wird.6. Airbag unit according to claim 5, characterized in that the further connection region is formed by a second seam (22).
7. Gassack-Einheit nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sich in Richtung der ersten Verbindungslinie eine zweite Verbindungslinie erstreckt, so dass zwischen erster und zweiter Verbindungslinie ein zweiter Strömungskanal (26) gebildet ist.7. Airbag unit according to one of the preceding claims, characterized in that extending in the direction of the first connecting line, a second connecting line, so that between the first and second connecting line, a second flow channel (26) is formed.
8. Gassack-Einheit nach Anspruch 7, dadurch gekennzeichnet, dass die zweite Verbindungslinie ein zweiter Abschnitt des Randes ist.8. Airbag unit according to claim 7, characterized in that the second connecting line is a second portion of the edge.
9. Gassack-Einheit nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Gasraum wenigstens zwei Schutzbereiche (16a, 16b) aufweist.9. Airbag unit according to one of the preceding claims, characterized in that the gas space has at least two protection areas (16a, 16b).
10. Gassack-Einheit nach einem der vorangehenden Ansprüche, dadurch ge- kennzeichnet, dass aus dem Ausströmbereich der Gasgeneratoreinheit genau zwei entgegengesetzte Teilgasströme austreten.10. Airbag unit according to one of the preceding claims, character- ized in that exit from the outflow of the gas generator unit exactly two opposite partial gas flows.
11. Gassack-Einheit nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sie eine Vorhanggassack-Einheit ist. 11. Airbag unit according to one of the preceding claims, characterized in that it is a curtain airbag unit.
PCT/EP2007/000978 2006-02-15 2007-02-06 Airbag unit WO2007093302A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006006865.3 2006-02-15
DE200610006865 DE102006006865B4 (en) 2006-02-15 2006-02-15 Airbag unit

Publications (1)

Publication Number Publication Date
WO2007093302A1 true WO2007093302A1 (en) 2007-08-23

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WO2002051671A2 (en) * 2000-12-27 2002-07-04 Toyota Jidosha Kabushiki Kaisha Air bag apparatus
US20030111829A1 (en) * 2001-12-18 2003-06-19 Tesch Todd E. Curtain air bag including inflatable perimeter gas channel
DE10211232A1 (en) * 2002-03-13 2003-10-09 Autoliv Dev Connector for air bag with two chambers comprises pipe mounted on gas generator near its outlets which is divided by sloping partitions into two sections, from which gas flows in opposite directions
EP1350687A1 (en) * 2002-03-19 2003-10-08 Takata Corporation Head protective airbag and head protective airbag device
EP1462321A1 (en) * 2003-03-24 2004-09-29 Key Safety Systems, Inc. Side curtain airbag

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GB2475383B (en) * 2009-11-10 2016-06-08 Gm Global Tech Operations Llc Airbag module for a vehicle

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DE102006006865B4 (en) 2012-01-12

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