WO2006079414A1 - Airbag of an airbag module - Google Patents

Airbag of an airbag module Download PDF

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Publication number
WO2006079414A1
WO2006079414A1 PCT/EP2005/014040 EP2005014040W WO2006079414A1 WO 2006079414 A1 WO2006079414 A1 WO 2006079414A1 EP 2005014040 W EP2005014040 W EP 2005014040W WO 2006079414 A1 WO2006079414 A1 WO 2006079414A1
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WO
WIPO (PCT)
Prior art keywords
airbag
tether
gas bag
outlet opening
volume
Prior art date
Application number
PCT/EP2005/014040
Other languages
German (de)
French (fr)
Inventor
Lutz Quarg
Friedrich Reiter
Original Assignee
Daimlerchrysler Ag
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Filing date
Publication date
Application filed by Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2006079414A1 publication Critical patent/WO2006079414A1/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
    • B60R21/23—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
    • B60R21/2338—Tethers
    • 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
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/2334—Expansion control features
    • B60R21/2338—Tethers
    • B60R2021/23382—Internal tether 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
    • B60R21/276—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 to vent the inflation fluid source, e.g. in case of overpressure

Definitions

  • the invention relates to an airbag of an airbag module according to the preamble of claim 1.
  • Passive safety technology in motor vehicles is known to include airbag devices whose gas bag is inflated abruptly in an accident to protect the inmates displaced by delay forward or sideways from injury.
  • the prior art shows a variety of solutions in which tethers are arranged within the airbag, which influence the propagation direction and the degree of propagation of the airbag.
  • tethers that have tear seams, a gradual deployment of the airbag can be realized.
  • DE 297 07 162 U1 shows an airbag which propagates with an impact section from an outlet opening of the airbag module in the direction of an occupant.
  • tethers are fastened in the outlet direction, which tear when a certain internal pressure prevailing inside the airbag is exceeded, so that the airbag can continue to deploy.
  • the tether arrangement described in DE 297 07 162 U1 causes, in particular, the risk of injury for a so-called "out-of-position" occupant to be reduced since the gas bag in a first deployment stage receives a volume reduced by the tethers inside the gas bag, the tear seams fail so that the gas bag can develop to its full size.
  • It is therefore an object of the invention is to provide an airbag for an airbag module with early retention, in the same time load peaks are reduced.
  • the invention relates to a tether for constricting the gas bag during deployment.
  • the tether which can be extended by at least one longitudinal section when a specific internal pressure prevailing inside the gas bag is exceeded, a greater depth of the gas bag between the outlet opening and the impact section facing the occupant can be achieved even with a smaller gas bag volume.
  • the tether is arranged such that the volume of the airbag while maintaining a minimum distance between the outlet opening of the gas bag and the
  • the occupant facing impact section Exits outlet opening, the occupant facing impact section. That is, by the tether the volume of the airbag to be filled is initially kept small, the special arrangement of the tether from the beginning of the deployment process ensures a minimum distance between the outlet opening of the airbag and the impact section. The occupant can be held back early.
  • the transverse to the direction of action or deployment direction of the airbag arranged tether that limits the initial volume of the airbag.
  • the effective or unfolding direction of the gas bag here is to be understood as the direction which is directed against the expected direction of movement of the occupant in the event of an impact. If the occupant dives into the gas bag in the further course of the impact, tear seams tear, for example, so that lateral volume can be released.
  • a primary object of the invention is to filter out load peaks, that is to keep the load of the occupant at a constant level. This is done by an extension of the tether occurs when a certain internal pressure is exceeded and thereby reduced by increasing the volume of the pressure. As a result, the pressure inside the gas bag is influenced by the tether. When the specific internal pressure prevailing within the gas bag is exceeded, the tether extends for at least one longitudinal section, for example by tearing a tear seam, so that the volume of the tearing seam increases Airbags can continue to enlarge. The tearing should not be abrupt, otherwise the pressure inside the gas bag would suddenly drop.
  • the extension of the tether is characteristic or pressure controlled, so that on the prevailing internal pressure, the extension of the tether can be influenced. The extension of the tether in turn affects the volume of the airbag, whereby a feedback to the pressure within the airbag takes place.
  • the tether extends approximately parallel to the plane of the outlet opening within the gas bag. As a result, a constriction is achieved transversely to the outlet direction of the gas bag. When extending the tether so that the effective range of the airbag can be increased far beyond the outlet opening.
  • the tether can be glued.
  • An additional advantage is that further energy is absorbed when tearing open.
  • a plurality of seams may be provided.
  • the seams may also have a different length or size and thereby fail at different pressures.
  • the tear or adhesive seam can be arranged in the middle of the tether. It can also be provided on the edge of the gas bag. There it can be combined with an outflow opening for the outflow of the gas. Such outflow openings are also called "Venthole”.
  • the tether covers an outflow opening so that it is closed at the beginning of the filling of the gas bag. Only when a certain internal pressure is exceeded, give the tethers and thereby release the openings. As a result, the gas bag keeps its high pressure level longer and adapts itself to the desired pressure level only when the occupant is submerged.
  • the tear seams - if there are several - must then be coordinated so that they tear each other and in each case at the right time.
  • Fig. 1 a cross section through an airbag of a
  • Fig. 1 shows a schematic representation of a steering wheel 1 in a motor vehicle, not shown.
  • the steering wheel 1 is equipped with an airbag module, of which only a filled airbag 2 is shown in the illustration.
  • the other components of the airbag module such as the gas generator or the airbag flaps are not shown for clarity.
  • the gas bag 2 occurs after activation of an outlet opening 3 of the steering wheel in the direction of the Steering wheel opposite sitting occupant 4, of which the head 5 is shown here, and unfolds according to its geometry.
  • a tether 6 is fastened with its two ends 7 and 8 on the inside 2a of the airbag 2. Approximately in the middle, the tether 6 is placed in a loop 9, which is fixed by means of a tear seam 10, so that a shortened length 1 of the tether 6 and thus a constricted airbag 2 results in a reduced volume.
  • the tear seam 10 fails, as a result of which the gas bag 2 can continue to unfold into the shape shown in dashed lines, while still maintaining the distance h between the impact section 2b opposite the occupants 4, 5 and the outlet opening 3 As a result, the occupant 4, 5 is always intercepted independently of the length 1 of the tether 6 at a minimum distance from the steering wheel 1.
  • FIG. 2 A possible arrangement of tear seams 10 in the tether 6 is shown in FIG. 2, which fail due to their different lengths at different internal pressures.

Abstract

The invention relates to and airbag (2) of an airbag module. Said airbag (2) expands with an impact section (2b) from an outlet opening (3) of the airbag module into the direction of an occupant (4, 5). The airbag comprises at least one holding strap (6), fastened to the inner sides (2a) of the airbag (2), which can be extended by at least one longitudinal section when a defined interior pressure inside the airbag (2) is exceeded, thereby enlarging the volume of the airbag (2). The aim of the invention is to provide an airbag for an early restraint airbag module in which the peak loads are reduced. For this purpose, the holding strap (6) extends inside the airbag (2) in such a manner that the volume of the airbag (2) is increased while at the same time maintaining a defined distance (h) between the outlet opening (3) and the impact section (2b) opposite the outlet opening (3) and facing the occupant (4, 5).

Description

Gassack eines Airbagmoduls Airbag of an airbag module
Die Erfindung betrifft einen Gassack eines Airbagmoduls gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an airbag of an airbag module according to the preamble of claim 1.
Passive Sicherheitstechnik in Kraftfahrzeugen umfasst bekanntermaßen Airbageinrichtungen, deren Gassack bei einem Unfall schlagartig aufgeblasen wird, um den sich durch Verzögerung nach vorn oder zur Seite verlagernden Insassen vor Verletzungen zu schützen.Passive safety technology in motor vehicles is known to include airbag devices whose gas bag is inflated abruptly in an accident to protect the inmates displaced by delay forward or sideways from injury.
Der Stand der Technik zeigt eine Vielzahl von Lösungen, bei denen Fangbänder innerhalb des Gassacks angeordnet sind, die die Ausbreitungsrichtung und den Ausbreitungsgrad des Gassacks beeinflussen . Außerdem kann mit Fangbändern, die Reißnähte aufweisen, ein stufenweises Entfalten des Gassacks realisiert werden.The prior art shows a variety of solutions in which tethers are arranged within the airbag, which influence the propagation direction and the degree of propagation of the airbag. In addition, with tethers that have tear seams, a gradual deployment of the airbag can be realized.
Die DE 297 07 162 Ul zeigt einen Gassack, der sich mit einem Aufprallabschnitt von einer Austrittsöffnung des Airbagmoduls in Richtung eines Insassen ausbreitet . An den Innenseiten des Gassacks sind in Austrittsrichtung Fangbänder befestigt , das bei Überschreiten eines bestimmten innerhalb des Gassacks herrschenden Innendrucks reißen, so dass sich der Gassack weiter entfalten kann. Die in der DE 297 07 162 Ul beschriebene Fangbandanordnung bewirkt , dass insbesondere die Verletzungsgefahr für einen sogenannten „out-of-Position"-Insassen reduziert wird, da der Gassack in einer ersten Entfaltungsstufe ein durch die Fangbänder reduziertes Volumen erhält . Erst bei zunehmendem Innendruck innerhalb des Gassacks versagen die Reißnähte, so dass sich der Gassack zu seiner vollen Größe entfalten kann .DE 297 07 162 U1 shows an airbag which propagates with an impact section from an outlet opening of the airbag module in the direction of an occupant. On the inner sides of the airbag, tethers are fastened in the outlet direction, which tear when a certain internal pressure prevailing inside the airbag is exceeded, so that the airbag can continue to deploy. The tether arrangement described in DE 297 07 162 U1 causes, in particular, the risk of injury for a so-called "out-of-position" occupant to be reduced since the gas bag in a first deployment stage receives a volume reduced by the tethers inside the gas bag, the tear seams fail so that the gas bag can develop to its full size.
Insbesondere bei begrenzten Bauraumverhältnissen, wie beispielsweise in Kleinkraftwagen, kann eine derartige Lösung nicht eingesetzt werden, da das Abfangen der Vorverlagerung des Insassen mit einem relativ geringen Gassackvolumen bewirkt werden muss .Especially with limited space conditions, such as in small cars, such a solution can not be used because the interception of the forward displacement of the occupant must be effected with a relatively small airbag volume.
Es besteht daher die Aufgabe der Erfindung darin, einen Gassack für ein Airbagmodul mit frühzeitiger Rückhaltung zu schaffen, bei dem gleichzeitig Lastspitzen reduziert werden .It is therefore an object of the invention is to provide an airbag for an airbag module with early retention, in the same time load peaks are reduced.
Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 gelöst . Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen .This object is achieved with the features of claim 1. Advantageous embodiments of the invention will become apparent from the dependent claims.
Gegenstand der Erfindung ist ein Fangband zum Einschnüren des Gassacks während des Entfaltens . Durch das Fangband, das bei Überschreiten eines bestimmten innerhalb des Gassacks herrschenden Innendrucks um wenigstens einen Längenabschnitt verlängerbar ist , kann auch bei geringerem Gassackvolumen eine größere Tiefe des Gassacks zwischen der Austrittsöffnung und dem der Austrittsöffnung gegenüberliegenden, dem Insassen zugewandten Aufprallabschnitt erzielt werden. Dazu ist es vorgesehen, dass innerhalb des Gassacks , der bei Aktivierung des Airbagmoduls schlagartig mit Gas befüllt wird, das Fangband derart angeordnet ist , dass sich das Volumen des Gassacks unter Beibehaltung eines Mindestabstands zwischen der Austrittsöffnung des Gassacks und dem derThe invention relates to a tether for constricting the gas bag during deployment. By means of the tether, which can be extended by at least one longitudinal section when a specific internal pressure prevailing inside the gas bag is exceeded, a greater depth of the gas bag between the outlet opening and the impact section facing the occupant can be achieved even with a smaller gas bag volume. For this purpose, it is provided that within the airbag, which is filled with activation of the airbag module abruptly with gas, the tether is arranged such that the volume of the airbag while maintaining a minimum distance between the outlet opening of the gas bag and the
Austrittsöffnung gegenüberliegenden, dem Insassen zugewandten Aufprallabschnitt vergrößert . Das heißt , durch das Fangband wird das auszufüllende Volumen des Gassacks zunächst klein gehalten, wobei die besondere Anordnung des Fangbands von Beginn des Entfaltungsprozesses an für einen Mindestabstand zwischen der Austrittsöffnung des Gassacks und dem Aufprallabschnitt sorgt . Der Insasse kann dadurch frühzeitig zurückgehalten werden. Das quer zur Wirk- bzw. Entfaltungsrichtung des Gassacks angeordnete Fangband das begrenzt das Anfangsvolumen des Gassacks . Unter Wirk- bzw. Entfaltungsrichtung des Gassacks ist hierbei die Richtung zu verstehen, die entgegen der erwarteten Bewegungsrichtung des Insassen bei einem Aufprall gerichtet ist . Taucht der Insasse im weiteren Verlauf des Aufpralls in den Gassack ein, reißen beispielsweise Reißnähte, so dass seitliches Volumen freigegeben werden kann . Durch das seitliche Ausweichen des Gassacks werden Druckspitzen im Airbag während der Belastungsphase durch den Insassen reduziert und somit gleichzeitig die Belastungen des Insassen gemindert , da diese proportional zum innerhalb des Gassacks herrschenden Airbagdruck sind .Exits outlet opening, the occupant facing impact section. That is, by the tether the volume of the airbag to be filled is initially kept small, the special arrangement of the tether from the beginning of the deployment process ensures a minimum distance between the outlet opening of the airbag and the impact section. The occupant can be held back early. The transverse to the direction of action or deployment direction of the airbag arranged tether that limits the initial volume of the airbag. The effective or unfolding direction of the gas bag here is to be understood as the direction which is directed against the expected direction of movement of the occupant in the event of an impact. If the occupant dives into the gas bag in the further course of the impact, tear seams tear, for example, so that lateral volume can be released. As a result of the lateral deflection of the gas bag, pressure peaks in the airbag are reduced by the occupant during the loading phase and, at the same time, the loads on the occupant are reduced, since these are proportional to the airbag pressure prevailing inside the gas bag.
Ein vorrangiges Ziel der Erfindung ist darin zu sehen, Lastspitzen auszufiltern, das heißt , die Belastung des Insassen auf einem konstanten Maß zu halten . Das erfolgt dadurch, indem bei Überschreiten eines bestimmten Innendrucks eine Verlängerung des Fangbandes eintritt und dabei durch Vergrößerung des Volumens der Druck reduziert wird. Dadurch wird über das Fangband der Druck innerhalb des Gassacks beeinflusst . Bei Überschreiten des bestimmten innerhalb des Gassacks herrschenden Innendrucks verlängert sich das Fangband um wenigstens einen Längenabschnitt , beispielsweise durch Reißen einer Reißnaht , so dass sich das Volumen des Airbags weiter vergrößern kann . Das Reißen sollte nicht schlagartig erfolgen, da sonst der Druck innerhalb des Gassacks schlagartig absinken würde . Das Verlängern des Fangbandes erfolgt kennlinien- bzw. druckgesteuert , so dass über den herrschenden Innendruck die Verlängerung des Fangbandes beeinflusst werden kann . Die Verlängerung des Fangbandes wiederum beeinflusst das Volumen des Gassacks, wodurch eine Rückkopplung auf den Druck innerhalb des Gassacks erfolgt .A primary object of the invention is to filter out load peaks, that is to keep the load of the occupant at a constant level. This is done by an extension of the tether occurs when a certain internal pressure is exceeded and thereby reduced by increasing the volume of the pressure. As a result, the pressure inside the gas bag is influenced by the tether. When the specific internal pressure prevailing within the gas bag is exceeded, the tether extends for at least one longitudinal section, for example by tearing a tear seam, so that the volume of the tearing seam increases Airbags can continue to enlarge. The tearing should not be abrupt, otherwise the pressure inside the gas bag would suddenly drop. The extension of the tether is characteristic or pressure controlled, so that on the prevailing internal pressure, the extension of the tether can be influenced. The extension of the tether in turn affects the volume of the airbag, whereby a feedback to the pressure within the airbag takes place.
In einer bevorzugten Ausführung erstreckt sich das Fangband etwa parallel zur Ebene der Austrittsöffnung innerhalb des Gassacks . Dadurch wird eine Einschnürung quer zur Austrittsrichtung des Gassacks erreicht . Bei Verlängerung des Fangbandes kann damit der Wirkbereich des Gassacks weit über die Austrittsöffnung hinaus vergrößert werden .In a preferred embodiment, the tether extends approximately parallel to the plane of the outlet opening within the gas bag. As a result, a constriction is achieved transversely to the outlet direction of the gas bag. When extending the tether so that the effective range of the airbag can be increased far beyond the outlet opening.
Mit einer quer zur Längserstreckung des Fangbandes verlaufenden Reißnaht kann eine einfache Verlängerung des Fangbandes erreicht werden .With a transverse to the longitudinal extent of the tether extending tear seam a simple extension of the tether can be achieved.
Alternativ zu einer Reißnaht kann das Fangband verklebt sein . Je höher der Druck im Gassack umso schneller reißt die Naht beziehungsweise löst sich der Klebstoff . Ein zusätzlicher Vorteil ist , dass beim Aufreißen weitere Energie absorbiert wird .Alternatively to a tear seam, the tether can be glued. The higher the pressure in the gas bag, the faster the seam tears or dissolves. An additional advantage is that further energy is absorbed when tearing open.
Zur Steuerung des Kraftniveaus innerhalb des Gassacks können mehrere Nähte vorgesehen sein . Die Nähte können auch eine unterschiedliche Länge oder Größe haben und dadurch bei unterschiedlichem Druck versagen.For controlling the force level within the gas bag, a plurality of seams may be provided. The seams may also have a different length or size and thereby fail at different pressures.
Die Reiß- oder Klebenaht kann in der Mitte des Fangbandes angeordnet sein. Sie kann auch am Rand des Gassacks vorgesehen sein . Dort kann sie mit einer Ausströmöffnung zum Ausströmen des Gases kombiniert werden . Derartige Ausströmöffnungen werden auch „Venthole" genannt .The tear or adhesive seam can be arranged in the middle of the tether. It can also be provided on the edge of the gas bag. There it can be combined with an outflow opening for the outflow of the gas. Such outflow openings are also called "Venthole".
In einer Ausführungsform deckt das Fangband eine Ausströmöffnung ab, so dass sie zu Beginn des Befüllens des Gassacks geschlossen ist . Erst bei Überschreiten eines bestimmten Innendrucks , geben die Fangbänder nach und geben dabei die Öffnungen frei . Dadurch hält der Gassack länger sein hohes Druckniveau und passt sich erst beim Eintauchen des Insassen an das gewünschte Druckniveau an . Die Reißnähte — wenn mehrere vorhanden sind- müssen dann so aufeinander abgestimmt sein, dass sie nach einander und j eweils zum richtigen Zeitpunkt reißen.In one embodiment, the tether covers an outflow opening so that it is closed at the beginning of the filling of the gas bag. Only when a certain internal pressure is exceeded, give the tethers and thereby release the openings. As a result, the gas bag keeps its high pressure level longer and adapts itself to the desired pressure level only when the occupant is submerged. The tear seams - if there are several - must then be coordinated so that they tear each other and in each case at the right time.
Vorteilhafte Ausgestaltungen der Erfindung werden im folgenden anhand der Zeichnung dargestellt . Dabei zeigen :Advantageous embodiments of the invention are illustrated below with reference to the drawing. Showing:
Fig . 1 einen Querschnitt durch einen Gassack einesFig. 1 a cross section through an airbag of a
Fahrerairbags mit einem Fangband sowie Fig . 2 Anordnung von Reißnähten auf einem Fangband.Driver airbags with a tether and Fig. 2 arrangement of tear seams on a tether.
Fig . 1 zeigt eine schematische Darstellung eines Lenkrads 1 in einem nicht dargestellten Kraftfahrzeug . Das Lenkrad 1 ist mit einem Airbagmodul ausgerüstet , von dem in der Darstellung lediglich ein befüllter Gassack 2 gezeichnet ist . Die weiteren Bauteile des Airbagmoduls wie beispielsweise der Gasgenerator oder die Airbagklappen sind der Übersichtlichkeit halber nicht dargestellt .Fig. 1 shows a schematic representation of a steering wheel 1 in a motor vehicle, not shown. The steering wheel 1 is equipped with an airbag module, of which only a filled airbag 2 is shown in the illustration. The other components of the airbag module such as the gas generator or the airbag flaps are not shown for clarity.
Der Gassack 2 tritt nach Aktivierung aus einer Austrittsöffnung 3 des Lenkrades in Richtung eines dem Lenkrad gegenüber sitzenden Insassen 4 , von dem hier der Kopf 5 dargestellt ist , aus und entfaltet sich seiner Geometrie entsprechend .The gas bag 2 occurs after activation of an outlet opening 3 of the steering wheel in the direction of the Steering wheel opposite sitting occupant 4, of which the head 5 is shown here, and unfolds according to its geometry.
Innerhalb des Gassacks 2 ist ein Fangband 6 mit seinen beiden Enden 7 und 8 an der Innenseite 2a des Gassacks 2 befestigt . Etwa mittig ist das Fangband 6 in eine Schlaufe 9 gelegt , die mittels einer Reißnaht 10 festgelegt ist , sodass sich eine verkürzte Länge 1 des Fangbandes 6 und damit ein eingeschnürter Gassack 2 mit einem reduzierten Volumen ergibt .Within the airbag 2, a tether 6 is fastened with its two ends 7 and 8 on the inside 2a of the airbag 2. Approximately in the middle, the tether 6 is placed in a loop 9, which is fixed by means of a tear seam 10, so that a shortened length 1 of the tether 6 and thus a constricted airbag 2 results in a reduced volume.
Bei Überschreiten eines bestimmten innerhalb des Gassacks herrschenden Innendrucks versagt die Reißnaht 10 , wodurch sich der Gassack 2 bis in die gestrichelt dargestellte Form weiter entfalten kann, j edoch unter Beibehaltung des Abstandes h zwischen dem den Insassen 4 , 5 gegenüberliegenden Aufprallabschnitt 2b und der Austrittsöffnung 3. Dadurch wird der Insasse 4 , 5 unabhängig von der Länge 1 des Fangbandes 6 immer in einem Mindestabstand zum Lenkrad 1 abgefangen.When there is a certain internal pressure prevailing inside the gas bag, the tear seam 10 fails, as a result of which the gas bag 2 can continue to unfold into the shape shown in dashed lines, while still maintaining the distance h between the impact section 2b opposite the occupants 4, 5 and the outlet opening 3 As a result, the occupant 4, 5 is always intercepted independently of the length 1 of the tether 6 at a minimum distance from the steering wheel 1.
Eine mögliche Anordnung von Reißnähten 10 im Fangband 6 zeigt Fig . 2 , die aufgrund ihrer unterschiedlichen Länge bei unterschiedlichen Innendrücken versagen . A possible arrangement of tear seams 10 in the tether 6 is shown in FIG. 2, which fail due to their different lengths at different internal pressures.

Claims

Patentansprüche claims
1. Gassack eines Airbagmoduls , wobei sich der Gassack mit einem Aufprallabschnitt von einer Austrittsöffnung des Airbagmoduls in Richtung eines Insassen ausbreitet , mit mindestens einem an den Innenseiten des Gassacks befestigten Fangband, das bei Überschreiten eines bestimmten innerhalb des Gassacks herrschenden Innendrucks um wenigstens einen Längenabschnitt verlängerbar ist , um das Volumen des Gassacks zu vergrößern, dadurch gekennzeichnet , dass das Fangband etwa quer zur Wirkrichtung des sich entfaltenden Gassacks angeordnet ist , um dasA gas bag of an airbag module, wherein the gas bag with an impact section from an outlet opening of the airbag module propagates in the direction of an occupant, with at least one attached to the insides of the airbag tether, which extends at least a length of a certain within the airbag prevailing internal pressure is exceeded is to increase the volume of the gas bag, characterized in that the tether is arranged approximately transversely to the direction of action of the unfolding gas bag to the
Airbagvolumen zumindest am Anfang der Entfaltung zu begrenzen.Limit airbag volume at least at the beginning of deployment.
2. Gassack nach Anspruch 1 , dadurch gekennzeichnet , dass sich das Fangband (6) innerhalb des Gassacks (2 ) derart erstreckt , dass sich das Volumen des Gassacks (2 ) unter Beibehaltung eines definierten Abstands (h) zwischen der Austrittsöffnung (3 ) und dem der Austrittsöffnung (3 ) gegenüberliegenden, dem Insassen (4 , 5) zugewandten Aufprallabschnitt (2b) vergrößert . 2. Airbag according to claim 1, characterized in that the tether (6) within the airbag (2) extends such that the volume of the airbag (2) while maintaining a defined distance (h) between the outlet opening (3) and the impact of the outlet (3) opposite, the occupant (4, 5) facing the impact section (2b) increases.
3. Gassack nach Anspruch 1 oder 2 , dadurch gekennzeichnet , dass sich das Fangband (6) etwa parallel zur Ebene der Austrittsöffnung (3 ) innerhalb des Gassacks (2 ) erstreckt .3. Airbag according to claim 1 or 2, characterized in that the tether (6) extends approximately parallel to the plane of the outlet opening (3) within the gas bag (2).
4. Gassack nach Anspruch 3 , dadurch gekennzeichnet , dass das Fangband (6) eine quer zur Längserstreckung des Fangbandes ( 6 ) verlaufende Reißnaht (10) aufweist .4. Airbag according to claim 3, characterized in that the tether (6) has a transverse to the longitudinal extent of the tether (6) extending tear seam (10).
5. Gassack nach Anspruch 3 , dadurch gekennzeichnet , dass das Fangband (6) eine quer zur Längserstreckung des Fangbandes (6) verlaufende Klebenaht (10) aufweist .5. Airbag according to claim 3, characterized in that the tether (6) has a transverse to the longitudinal extent of the tether (6) extending adhesive seam (10).
6. Gassack nach einem der Ansprüche 4 oder 5 , dadurch gekennzeichnet , dass das Fangband (6) mehrere Nähte aufweist .6. Airbag according to one of claims 4 or 5, characterized in that the tether (6) has a plurality of seams.
7. Gassack nach einem der Ansprüche 4 oder 5 , dadurch gekennzeichnet , dass die Naht (10) mittig im Fangband (6) angeordnet ist .7. Airbag according to one of claims 4 or 5, characterized in that the seam (10) is arranged centrally in the tether (6).
8. Gassack nach einem der Ansprüche 4 oder 5 , dadurch gekennzeichnet , dass die Naht (10 ) an einem Randbereich des Fangbands (6) angeordnet ist und dabei eine Ausströmöffnung im Gassack (2 ) abdeckt . 8. Airbag according to one of claims 4 or 5, characterized in that the seam (10) is arranged on an edge region of the tether (6) and thereby covers an outflow opening in the gas bag (2).
PCT/EP2005/014040 2005-01-29 2005-12-24 Airbag of an airbag module WO2006079414A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510004183 DE102005004183A1 (en) 2005-01-29 2005-01-29 Gas bag for air bag module, has catch strip extending when internal pressure prevailing inside the gas bag exceeds about longitudinal section in order to increase volume of gas bag
DE102005004183.3 2005-01-29

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DE102018102869A1 (en) * 2018-02-08 2019-08-08 Dalphi Metal Espana, S.A. Airbag module and method for producing an airbag module

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JP2000142290A (en) * 1998-11-09 2000-05-23 Kansei Corp Vehicular air bag
DE19860823A1 (en) * 1998-12-30 2000-07-06 Volkswagen Ag Device to protect of front seat passenger in private motor vehicle has folded airbag installed in front of passenger's seat behind front bulkhead outside vehicle's interior, and deploys in front of passenger through bulkhead opening
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US3879056A (en) * 1972-02-21 1975-04-22 Toyoda Boshoku Kk Safety gas bag structure
US6095557A (en) * 1997-08-08 2000-08-01 Toyoda Gosei Co., Ltd. Air bag apparatus
US20040012180A1 (en) * 2002-07-19 2004-01-22 Hawthorn Laura Adelle Air bag restraint including selectively operable venting elements

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