WO2014056586A1 - Airbag for a motor vehicle - Google Patents

Airbag for a motor vehicle Download PDF

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Publication number
WO2014056586A1
WO2014056586A1 PCT/EP2013/002970 EP2013002970W WO2014056586A1 WO 2014056586 A1 WO2014056586 A1 WO 2014056586A1 EP 2013002970 W EP2013002970 W EP 2013002970W WO 2014056586 A1 WO2014056586 A1 WO 2014056586A1
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WO
WIPO (PCT)
Prior art keywords
airbag
volume
layers
retention
support structure
Prior art date
Application number
PCT/EP2013/002970
Other languages
German (de)
French (fr)
Inventor
Ralf Bogenrieder
Christian Burczyk
Andreas Hirth
Friedrich Reiter
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2014056586A1 publication Critical patent/WO2014056586A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/231Inflatable members characterised by their shape, construction or spatial configuration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/239Inflatable members characterised by their venting means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/231Inflatable members characterised by their shape, construction or spatial configuration
    • B60R2021/23115Inflatable members characterised by their shape, construction or spatial configuration with inflatable support compartments creating an internal suction volume
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/239Inflatable members characterised by their venting means
    • B60R2021/2395Inflatable members characterised by their venting means comprising means to control the venting

Definitions

  • the invention relates to an airbag for a motor vehicle according to the preamble of patent claim 1.
  • the airbag has a support structure comprising a plurality of volume elements.
  • the support structure is movable from a storage position to a retention position by pressurizing the volume elements with a medium, in particular gas.
  • the support structure In its retention position, the support structure surrounds a retention volume of the airbag at least in regions.
  • a gaseous medium in particular air, flows into the retention volume, so that the retention volume in the retaining position of the support structure is at least partially filled with the gaseous medium.
  • Support structure particularly fast, i. in a particularly short time, from her
  • Retention position can be moved to its retention position.
  • Total volume of the volume elements can be made much smaller than the retention volume. This allows the support structure particularly fast in the
  • an airbag for a motor vehicle of the type mentioned in such a way that a particularly advantageous damping behavior of the airbag in a particularly simple and cost-effective manner can be realized.
  • At least a portion of the volume elements of Support structure is formed by at least two in at least one overlap region in mutual overlap and interconnected layers, wherein at least one of the layers has at least one flow opening over which in the
  • Retaining position in the retaining volume medium located in an impact of a vehicle occupant on the airbag is at least partially dissipated from the retention volume.
  • Vehicle occupants on the airbag i. On the support structure, so an increase in the pressure prevailing in the retention volume internal pressure is effected in comparison to a time before the impact of the vehicle occupant on the support structure to which the support structure is already in its retention position or has found, the vehicle occupant but not yet impacted on the airbag.
  • the medium located in the retention volume can now flow out of the retention volume via the at least one flow-through opening of the at least one layer and flow, for example, into the interior of the motor vehicle.
  • the high internal pressure in the retention volume can thereby be reduced, so that a advantageous damping of the airbag is created, whereby the
  • Throughflow from the retention volume outflowing medium can be adjusted as needed, so that thereby a needs-based damping function of the airbag can be realized.
  • the at least one flow opening which is also referred to as Vent Hole
  • the at least one flow opening in a particularly simple and cost-effective manner already in the production of the volume elements or formed the support structure and in the layers, for example by cutting, punching or the like separating method can be produced.
  • the at least one layer which has the at least one flow opening projects beyond the other layer in at least one subregion, wherein the at least one flow opening is arranged in the subregion.
  • the at least one layer is thus enlarged in relation to the other layer in the subregion in order to integrate the at least one throughflow opening into the subregion.
  • the layers in the overlap region have respective, corresponding throughflow openings, via which the medium in the retention position in the retention volume can be at least partially removed from the retention volume in the event of a collision of a vehicle occupant with the airbag.
  • This integration of the flow-through openings into the layers of the support structure has the advantage that as a result of the at least two-layer configuration of the support structure or the volume elements, an additional reinforcement in the region of the flow-through openings is not required.
  • the layer which is designed as a pliable fabric, is dar.
  • the situation is charged, as it is for example the impact of the Vehicle occupants on the support structure, which is also referred to as immersion, is the case, so it may come in the flow opening to damage, for example, by tearing, since there may occur load peaks.
  • the flow-limiting edges of the layer are reinforced by, for example, a reinforcing element is provided.
  • Reinforcing elements are relatively complex and thus time consuming and expensive to display.
  • Layers are formed layers formed, the layers reinforce each other in the area of the flow openings, so that additional
  • the support structure also has a high degree of robustness in the area of the flow-through openings, so that the risk of damage if the vehicle occupant enters the
  • Submerged support structure is particularly low.
  • the layers are preferably designed as textile layers, in particular as fabric layers, so that they have a particularly high degree of robustness and thus ensure a particularly advantageous catching and retaining function.
  • the invention also includes a method for producing an airbag according to the invention.
  • Advantageous embodiments of the airbag according to the invention are to be regarded as advantageous embodiments of the method according to the invention and vice versa.
  • the support structure can be made particularly time-consuming and cost-effective in the context of the process.
  • the layers produced in the context of a cutting process of at least one contiguous and at least substantially limp semi-finished i. be tailored.
  • the at least one flow-through opening is already produced during the cutting of the layers, i. in which at least one layer is integrated.
  • the drawing shows in the single FIGURE is a schematic plan view of a support structure for an airbag of a motor vehicle, in particular a passenger car, wherein the support structure has volume elements, by two at least in one
  • Covering area arranged in mutually overlapping and interconnected textile layers are formed, which have respective, corresponding through-flow openings in the overlap region, via which a medium located in a retention volume of the airbag in the event of a collision of a
  • Vehicle occupant on the airbag is at least partially removable from the retention volume.
  • the Fig. Shows a designated as a whole with 10 airbag for a motor vehicle, especially a passenger car.
  • the airbag 10 has a support structure 12, which comprises a plurality of volume elements 14.
  • the volume elements 14 have in finished manufactured state of the support structure 12 at least substantially a tubular shape.
  • the volume elements 14 are produced in such a way that at least two textile layers in the form of fabric layers at least in one
  • Cover area arranged in mutual overlap and connected to each other in respective connection areas.
  • Tissue piece 16 is formed, which is folded around at least one folding axis.
  • the piece of fabric 16 is at least partially axially symmetrical, so that by folding the piece of fabric 16 about this folding axis two at least substantially symmetrical to each other formed areas of the fabric piece 16 folded up and thus in mutual
  • the fabric layers are now connected to each other in the respective connection areas.
  • the fabric layers or the areas of the Tissue piece 16 is not connected to each other, so that respective volumes of the volume elements 14 are formed in these non-interconnected parts.
  • tissue layers can lift off one another so that the volumes are filled with the gaseous medium.
  • the respective volumes of the volume elements 14 are fluidly connected to each other, so that thereby a fluidically coherent total volume is formed.
  • the airbag 10 also has at least one actuator, not shown in the figure, in the form of a gas generator, by means of which the volume elements 14 or their respective volumes and thus the total volume can be acted upon and thus inflated with a gaseous medium, in particular air. can.
  • a gaseous medium in particular air. can.
  • Storage position is moved to a retention position.
  • the support structure 12 surrounds a retention volume of the airbag 10 in regions.
  • Retention position is accompanied by a gradual increase in the retention volume. This results in the retention volume compared to the interior of the
  • the retention volume fills at least substantially passively with air due to the movement of the support structure 12 into the retention position.
  • At least one actuator for example at least one gas generator
  • at least one gas generator for example at least one gas generator
  • the inflow of air from the interior into the retention volume takes place via open spaces 18 between the volume elements 14.
  • the air from the interior through the open spaces 18 between the volume elements 14 can flow into the retention volume.
  • the airbag 10 also includes an enclosure 20, by means of which the retention volume in the retention position is at least partially surrounded.
  • the wrapper 20 is included at least partially disposed in the open spaces 18 and has passage openings 22 through which the air from the interior can flow into the retention volume.
  • the sheath 20 also has a valve functionality, by means of which an outflow of the air in the retention volume from the retention volume into the interior is at least substantially avoided when a vehicle occupant strikes the airbag 10 due to an accidental application of force.
  • Retention volume prevailing internal pressure As a result of this internal pressure increase, the vehicle occupant can be very well caught and retained.
  • the support structure 12 in this case has a framework structure, wherein the at least substantially tubular volume elements 14 form interconnected strut elements of the truss structure.
  • the strut elements delimits the free surfaces 18.
  • the total volume of the support structure 12 to be acted upon by the gaseous medium can be kept low.
  • the support structure 12 may be particularly fast, i. be moved from its storage position to the retention position in a very short time.
  • the supporting structure 12 can assume a particularly large volume in the interior of the motor vehicle in its retaining position, so that the vehicle occupant can be caught and retained particularly early.
  • the fabric layers or the regions of the fabric piece 16 have respective, corresponding through-flow openings 24.
  • the flow openings 24 are arranged in mutual overlap. Via the through-flow openings 24, the gaseous medium (air) located in the retention volume in the retention volume can at least partially escape from the retention volume and flow into the interior space when the vehicle occupant bumps against the support structure 12. This can be due to the impact of the gaseous medium (air) located in the retention volume in the retention volume. This can be due to the impact of the
  • the flow-through openings 24 are - in relation to the finished state of the support structure 12 - arranged in the overlapping region of the fabric layers, whereby the fabric layers reinforce each other in the region of the flow openings 24.
  • the support structure 12 also has a very high robustness and stability in the region of the throughflow openings 24.
  • the support structure 12 can be made particularly time-consuming and cost-effective due to the integration of the flow openings 24 in the fabric layers, since the flow openings 24, for example, already at a trimming or cutting of the fabric piece 16, for example

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

The invention relates to an airbag (10) for a motor vehicle, comprising a supporting structure (12), having a plurality of volume elements (14), that is movable from a storage position into a restraint position by supplying a medium to the volume elements (14) and that, in the restraint position, surrounds at least in regions a restraint volume of the airbag (10), which volume is filled at least to some extent with a gaseous medium, at least part of the volume elements (14) being formed by at least two layers which are arranged in at least one region of overlap so as to mutually overlap and which are connected to each other. At least one of the layers has at least one passage opening (24) via which the medium present in the retaining volume can be removed from the retaining volume at least to some extent upon impact of a passenger onto the airbag.

Description

Airbag für einen Kraftwagen  Airbag for a motor vehicle
Die Erfindung betrifft einen Airbag für einen Kraftwagen gemäß dem Oberbegriff von Patentanspruch 1. The invention relates to an airbag for a motor vehicle according to the preamble of patent claim 1.
Ein solcher Airbag ist der DE 10 2007 052 246 A1 als bekannt zu entnehmen. Der Airbag weist eine Stützstruktur auf, welche eine Mehrzahl von Volumenelementen umfasst. Die Stützstruktur ist durch Beaufschlagen der Volumenelemente mit einem Medium, insbesondere Gas, aus einer Aufbewahrungsposition in eine Rückhalteposition bewegbar. Such an airbag can be found in DE 10 2007 052 246 A1 as known. The airbag has a support structure comprising a plurality of volume elements. The support structure is movable from a storage position to a retention position by pressurizing the volume elements with a medium, in particular gas.
In ihrer Rückhalteposition umgibt die Stützstruktur ein Rückhaltevolumen des Airbags zumindest bereichsweise. Durch das Bewegen der Stützstruktur aus der In its retention position, the support structure surrounds a retention volume of the airbag at least in regions. By moving the support structure out of the
Aufbewahrungsposition in die Rückhalteposition strömt ein gasförmiges Medium, insbesondere Luft, in das Rückhaltevolumen ein, so dass das Rückhaltevolumen in der Rückhalteposition der Stützstruktur zumindest teilweise mit dem gasförmigen Medium gefüllt ist. Storing position in the retaining position, a gaseous medium, in particular air, flows into the retention volume, so that the retention volume in the retaining position of the support structure is at least partially filled with the gaseous medium.
Um einen bei einer unfallbedingten Kraftbeaufschlagung auf den Airbag aufprallenden Fahrzeuginsassen des Kraftwagens vorteilhaft auffangen, rückhalten und so vor schwerwiegenden Verletzungen schützen zu können, ist es von Vorteil, wenn die In order to catch a colliding with an accidental application of force to the airbag vehicle occupants of the motor vehicle advantageously, and thus be able to protect against serious injury, it is advantageous if the
Stützstruktur besonders schnell, d.h. in besonders kurzer Zeit, aus ihrer Support structure particularly fast, i. in a particularly short time, from her
Aufbewahrungsposition in ihre Rückhalteposition bewegt werde kann. Retention position can be moved to its retention position.
Dies ist bei diesem Airbag möglich, da ein mit dem Medium zu beaufschlagendes This is possible with this airbag, since a to be acted upon by the medium
Gesamtvolumen der Volumenelemente wesentlich geringer ausgebildet werden kann als das Rückhaltevolumen. Dadurch kann die Stützstruktur besonders schnell in die Total volume of the volume elements can be made much smaller than the retention volume. This allows the support structure particularly fast in the
Rückhalteposition bewegt werden und im Innenraum des Kraftwagens ein sehr großes Volumen einnehmen. Zusätzlich zu dieser vorteilhaften Auffang- und Rückhaltefunktion des Airbags ist ein entsprechendes, dämpfendes Verhalten des Airbags wünschenswert, um dadurch den auf den Airbag aufprallenden Insassen abzubremsen. Retaining position to be moved and occupy a very large volume in the interior of the motor vehicle. In addition to this advantageous fallback and retention function of the airbag, a corresponding cushioning behavior of the airbag is desirable to thereby decelerate the occupant bouncing on the airbag.
Es ist daher Aufgabe der vorliegenden Erfindung, einen Airbag für einen Kraftwagen der eingangs genannten Art derart weiterzuentwickeln, dass ein besonders vorteilhaftes dämpfendes Verhalten des Airbags auf besonders einfache und kostengünstige Weise realisierbar ist. It is therefore an object of the present invention, an airbag for a motor vehicle of the type mentioned in such a way that a particularly advantageous damping behavior of the airbag in a particularly simple and cost-effective manner can be realized.
Diese Aufgabe wird durch einen Airbag für einen Kraftwagen mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen mit zweckmäßigen und nichttrivialen Weiterbildungen der Erfindung sind in den übrigen Ansprüchen angegeben. This object is achieved by an airbag for a motor vehicle having the features of patent claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.
Um einen Airbag für Kraftwagen, insbesondere einen Personenkraftwagen, der im Oberbegriff des Patentanspruchs 1 angegebenen Art derart weiterzuentwickeln, dass ein besonders vorteilhaftes dämpfendes Verhalten des Airbags auf besonders einfache und kostengünstige Weise realisierbar ist, ist es erfindungsgemäß vorgesehen, dass zumindest ein Teil der Volumenelemente der Stützstruktur durch wenigstens zwei zumindest in einem Überdeckungsbereich in gegenseitiger Überdeckung angeordnete und miteinander verbundene Lagen gebildet ist, wobei wenigstens eine der Lagen zumindest eine Durchströmöffnung aufweist, über welche das sich in der In order to develop an airbag for motor vehicles, in particular a passenger car, specified in the preamble of claim 1 type such that a particularly advantageous damping behavior of the airbag in a particularly simple and inexpensive manner can be realized, it is inventively provided that at least a portion of the volume elements of Support structure is formed by at least two in at least one overlap region in mutual overlap and interconnected layers, wherein at least one of the layers has at least one flow opening over which in the
Rückhalteposition in dem Rückhaltevolumen befindende Medium bei einem Aufprall eines Fahrzeuginsassen auf den Airbag zumindest teilweise aus dem Rückhaltevolumen abführbar ist. Retaining position in the retaining volume medium located in an impact of a vehicle occupant on the airbag is at least partially dissipated from the retention volume.
Trifft ein Fahrzeuginsasse infolge einer unfallbedingten Verlagerung des Meets a vehicle occupant as a result of accidental relocation of
Fahrzeuginsassen auf den Airbag, d.h. auf die Stützstruktur auf, so wird dadurch eine Erhöhung eines im Rückhaltevolumen herrschenden Innendrucks bewirkt im Vergleich zu einem Zeitpunkt vor dem Aufprall des Fahrzeuginsassen auf die Stützstruktur, zu welchem sich die Stützstruktur bereits in ihrer Rückhalteposition befindet bzw. befunden hat, der Fahrzeuginsasse jedoch noch nicht auf den Airbag aufgeprallt ist. Vehicle occupants on the airbag, i. On the support structure, so an increase in the pressure prevailing in the retention volume internal pressure is effected in comparison to a time before the impact of the vehicle occupant on the support structure to which the support structure is already in its retention position or has found, the vehicle occupant but not yet impacted on the airbag.
Infolge dieser Druckerhöhung kann nun das sich in dem Rückhaltevolumen befindende Medium über die zumindest eine Durchströmöffnung der wenigstens einen Lage aus dem Rückhaltevolumen aus- und beispielsweise in den Innenraum des Kraftwagens einströmen. Je nach Ausgestaltung der zumindest einen Durchströmöffnung kann dadurch der hohe Innendruck im Rückhaltevolumen abgebaut werden, so dass ein vorteilhaftes, dämpfendes Veralten des Airbags geschaffen ist, wodurch der As a result of this pressure increase, the medium located in the retention volume can now flow out of the retention volume via the at least one flow-through opening of the at least one layer and flow, for example, into the interior of the motor vehicle. Depending on the configuration of the at least one flow-through opening, the high internal pressure in the retention volume can thereby be reduced, so that a advantageous damping of the airbag is created, whereby the
Fahrzeuginsasse abgebremst wird. Durch entsprechende Ausgestaltung der zumindest einen Durchströmöffnung kann ein Volumen- bzw. Massenstrom des über die Vehicle occupant is braked. By appropriate design of the at least one flow opening, a volume or mass flow of the over
Durchströmöffnung aus dem Rückhaltevolumen ausströmenden Mediums bedarfsgerecht eingestellt werden, so dass dadurch eine bedarfsgerechte Dämpfungsfunktion des Airbags realisierbar ist. Throughflow from the retention volume outflowing medium can be adjusted as needed, so that thereby a needs-based damping function of the airbag can be realized.
Infolge der Integration der zumindest einen Durchströmöffnung, welche auch als Vent- Hole bezeichnet wird, in die wenigstens eine Lage, aus denen auch die Volumenelemente hergestellt sind, kann die zumindest eine Durchströmöffnung auf besonders einfache und kostengünstige Weise bereits bei der Herstellung der Volumenelemente bzw. der Stützstruktur ausgebildet und in den Lagen, beispielsweise durch Schneiden, Stanzen oder dergleichen trennendes Verfahren, hergestellt werden. As a result of the integration of the at least one flow opening, which is also referred to as Vent Hole, in the at least one layer from which the volume elements are made, the at least one flow opening in a particularly simple and cost-effective manner already in the production of the volume elements or formed the support structure and in the layers, for example by cutting, punching or the like separating method can be produced.
Aufgrund dieser Integration der zumindest einen Durchströmöffnung in die Stützstruktur kann vorgesehen sein, dass die wenigstens eine Lage, welche die zumindest eine Durchströmöffnung aufweist, die andere Lage in wenigstens einem Teilbereich überragt, wobei die zumindest eine Durchströmöffnung in dem Teilbereich angeordnet ist. Dies bedeutet, dass somit die wenigstens eine Lage gegenüber der anderen Lage in dem Teilbereich vergrößert ist, um die zumindest eine Durchströmöffnung in den Teilbereich zu integrieren. Due to this integration of the at least one flow opening into the support structure, it can be provided that the at least one layer which has the at least one flow opening projects beyond the other layer in at least one subregion, wherein the at least one flow opening is arranged in the subregion. This means that the at least one layer is thus enlarged in relation to the other layer in the subregion in order to integrate the at least one throughflow opening into the subregion.
Bei einer besonders vorteilhaften Ausführungsform der Erfindung weisen die Lagen in dem Überdeckungsbereich jeweilige, korrespondierende Durchströmöffnungen aufweisen, über welche das sich in der Rückhalteposition in dem Rückhaltevolumen befindende Medium bei einem Aufprall eines Fahrzeuginsassen auf den Airbag zumindest teilweise aus dem Rückhaltevolumen abführbar ist. In a particularly advantageous embodiment of the invention, the layers in the overlap region have respective, corresponding throughflow openings, via which the medium in the retention position in the retention volume can be at least partially removed from the retention volume in the event of a collision of a vehicle occupant with the airbag.
Diese Integration der Durchströmöffnungen in die Lagen der Stützstruktur weist den Vorteil auf, dass infolge der wenigstens zweilagigen Ausgestaltung der Stützstruktur bzw. der Volumenelemente eine zusätzliche Verstärkung im Bereich der Durchströmöffnungen nicht erforderlich ist. This integration of the flow-through openings into the layers of the support structure has the advantage that as a result of the at least two-layer configuration of the support structure or the volume elements, an additional reinforcement in the region of the flow-through openings is not required.
Falls keine entsprechenden Gegenmaßnahmen getroffen sind, stellen If no appropriate countermeasures are taken, provide
Durchströmöffnungen in einer Lage, insbesondere in einer Gewebelage, Flow-through openings in one layer, in particular in a fabric layer,
herkömmlicherweise Schwächungen der Lage, welche als biegeschlaffes Flächengebilde ausgebildet ist, dar. Wird die Lage belastet, wie es beispielsweise beim Aufprallen der Fahrzeuginsassen auf die Stützstruktur, was auch als Eintauchen bezeichnet wird, der Fall ist, so kann es im Bereich der Durchströmöffnung zu Beschädigungen beispielsweise durch Reißen kommen, da dort Belastungsspitzen auftreten können. Um solche weakening of the layer, which is designed as a pliable fabric, is dar., the situation is charged, as it is for example the impact of the Vehicle occupants on the support structure, which is also referred to as immersion, is the case, so it may come in the flow opening to damage, for example, by tearing, since there may occur load peaks. To such
Beschädigungen zu vermeiden, kann die Lage entsprechend verstärkt werden. Dazu werden beispielsweise die Durchströmöffnung begrenzende Ränder der Lage verstärkt, indem beispielsweise ein Verstärkungselement vorgesehen wird. Derartige Damage can be avoided, the situation can be strengthened accordingly. For this purpose, for example, the flow-limiting edges of the layer are reinforced by, for example, a reinforcing element is provided. such
Verstärkungselemente sind relativ aufwändig und somit zeit- und kostenintensiv darstellbar. Reinforcing elements are relatively complex and thus time consuming and expensive to display.
Da nun die Durchströmöffnungen im Überdeckungsbereich der als biegeschlaffe Since now the flow-through openings in the overlap area as a pliable
Flächengebilde ausgebildeten Lagen angeordnet sind, verstärken sich die Lagen im Bereich der Durchströmöffnungen gegenseitig, so dass zusätzliche Layers are formed layers formed, the layers reinforce each other in the area of the flow openings, so that additional
Verstärkungsmaßnahmen nicht erforderlich sind. Durch diese gegenseitige Verstärkung weist die Stützstruktur auch im Bereich der Durchströmöffnungen eine hohe Robustheit auf, so dass die Gefahr einer Beschädigung, wenn der Fahrzeuginsasse in die Reinforcement measures are not required. As a result of this mutual reinforcement, the support structure also has a high degree of robustness in the area of the flow-through openings, so that the risk of damage if the vehicle occupant enters the
Stützstruktur eintaucht, besonders gering ist. Submerged support structure is particularly low.
Vorzugsweise sind die Lagen als Textillagen, insbesondere als Gewebelagen, ausgebildet, so dass sie eine besonders hohe Robustheit aufweisen und somit eine besonders vorteilhafte Auffang- und Rückhaltefunktion gewährleisten. The layers are preferably designed as textile layers, in particular as fabric layers, so that they have a particularly high degree of robustness and thus ensure a particularly advantageous catching and retaining function.
Zur Erfindung gehört auch ein Verfahren zum Herstellen eines erfindungsgemäßen Airbags. Vorteilhafte Ausgestaltungen des erfindungsgemäßen Airbags sind als vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens anzusehen und umgekehrt. Durch die Integration der zumindest einen Durchströmöffnung in die The invention also includes a method for producing an airbag according to the invention. Advantageous embodiments of the airbag according to the invention are to be regarded as advantageous embodiments of the method according to the invention and vice versa. By integrating the at least one flow opening in the
Volumenelemente bzw. in die Stützstruktur kann die Stützstruktur im Rahmen des Verfahrens besonders zeit- und kostengünstig hergestellt werden. Volume elements or in the support structure, the support structure can be made particularly time-consuming and cost-effective in the context of the process.
Dabei kann vorgesehen sein, dass die Lagen im Rahmen eines Schnittverfahrens aus wenigstens einem zusammenhängenden und zumindest im Wesentlichen biegeschlaffen Halbzeug hergestellt, d.h. zugeschnitten werden. Vorzugsweise ist dabei vorgesehen, dass die zumindest eine Durchströmöffnung bereits beim Zuschnitt der Lagen hergestellt, d.h. in die wenigstens eine Lage integriert wird. It can be provided that the layers produced in the context of a cutting process of at least one contiguous and at least substantially limp semi-finished, i. be tailored. Preferably, it is provided that the at least one flow-through opening is already produced during the cutting of the layers, i. in which at least one layer is integrated.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels sowie anhand der Zeichnung. Die vorstehend in der Beschreibung genannten Merkmale und Merkmalskombinationen sowie die nachfolgend in der Figurenbeschreibung genannten und/oder in der Figur alleine gezeigten Merkmale und Merkmalskombinationen sind nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar, ohne den Rahmen der Erfindung zu verlassen. Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features mentioned above in the description and Feature combinations as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figure can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the invention.
Die Zeichnung zeigt in der einzigen Fig. eine schematische Draufsicht einer Stützstruktur für einen Airbag eines Kraftwagens, insbesondere eines Personenkraftwagens, wobei die Stützstruktur Volumenelemente aufweist, die durch zwei zumindest in einem The drawing shows in the single FIGURE is a schematic plan view of a support structure for an airbag of a motor vehicle, in particular a passenger car, wherein the support structure has volume elements, by two at least in one
Überdeckungsbereich in gegenseitiger Überdeckung angeordnete und miteinander verbundene Textillagen gebildet sind, die in dem Überdeckungsbereich jeweilige, korrespondierende Durchströmöffnungen aufweisen, über welche ein sich in einem Rückhaltevolumen des Airbags befindendes Medium bei einem Aufprall eines Covering area arranged in mutually overlapping and interconnected textile layers are formed, which have respective, corresponding through-flow openings in the overlap region, via which a medium located in a retention volume of the airbag in the event of a collision of a
Fahrzeuginsassen auf den Airbag zumindest teilweise aus dem Rückhaltevolumen abführbar ist. Vehicle occupant on the airbag is at least partially removable from the retention volume.
Die Fig. zeigt einen im Ganzen mit 10 bezeichneten Airbag für einen Kraftwagen, insbesondere einen Personenkraftwagen. Der Airbag 10 weist eine Stützstruktur 12 auf, welche eine Mehrzahl von Volumenelementen 14 umfasst. Die Volumenelemente 14 weisen in fertig hergestelltem Zustand der Stützstruktur 12 zumindest im Wesentlichen eine Röhrenform auf. Die Volumenelemente 14 werden dabei derart hergestellt, dass wenigstens zwei Textillagen in Form von Gewebelagen zumindest in einem The Fig. Shows a designated as a whole with 10 airbag for a motor vehicle, especially a passenger car. The airbag 10 has a support structure 12, which comprises a plurality of volume elements 14. The volume elements 14 have in finished manufactured state of the support structure 12 at least substantially a tubular shape. The volume elements 14 are produced in such a way that at least two textile layers in the form of fabric layers at least in one
Überdeckungsbereich in gegenseitiger Überdeckung angeordnet und in jeweiligen Verbindungsbereichen miteinander verbunden werden. Cover area arranged in mutual overlap and connected to each other in respective connection areas.
Diese Gewebelagen werden dabei vorliegend durch ein zusammenhängendes These fabric layers are present in this case by a coherent
Gewebestück 16 gebildet, welches um wenigstens eine Klappachse geklappt wird. Tissue piece 16 is formed, which is folded around at least one folding axis.
Bezogen auf diese Klappachse ist das Gewebestück 16 zumindest bereichsweise achsensymmetrisch ausgebildet, so dass durch Klappen des Gewebestücks 16 um diese Klappachse zwei zumindest im Wesentlichen symmetrisch zueinander ausgebildete Bereiche des Gewebestücks 16 aufeinandergeklappt und somit in gegenseitige Based on this folding axis, the piece of fabric 16 is at least partially axially symmetrical, so that by folding the piece of fabric 16 about this folding axis two at least substantially symmetrical to each other formed areas of the fabric piece 16 folded up and thus in mutual
Überdeckung angeordnet werden. Diese Bereiche des Gewebestücks 16 stellen dabei die Gewebelagen dar. Cover can be arranged. These regions of the fabric piece 16 represent the fabric layers.
Die Gewebelagen werden nun in den jeweiligen Verbindungsbereichen miteinander verbunden. In Teilen des Überdeckungsbereichs, welche zwischen den jeweiligen Verbindungsbereichen angeordnet sind, werden die Gewebelagen bzw. die Bereiche des Gewebestücks 16 nicht miteinander verbunden, so dass in diesen nicht miteinander verbundenen Teilen jeweilige Volumina der Volumenelemente 14 gebildet sind. The fabric layers are now connected to each other in the respective connection areas. In parts of the overlapping area, which are arranged between the respective connecting areas, the fabric layers or the areas of the Tissue piece 16 is not connected to each other, so that respective volumes of the volume elements 14 are formed in these non-interconnected parts.
Wird in diese Volumina ein gasförmiges Medium, beispielsweise Luft, eingefüllt, so können die Gewebelagen voneinander abheben, so dass sich die Volumina mit dem gasförmigen Medium füllen. Die jeweiligen Volumina der Volumenelemente 14 sind dabei fluidisch miteinander verbunden, so dass dadurch ein fluidisch zusammenhängendes Gesamtvolumen gebildet ist. If a gaseous medium, for example air, is introduced into these volumes, then the tissue layers can lift off one another so that the volumes are filled with the gaseous medium. The respective volumes of the volume elements 14 are fluidly connected to each other, so that thereby a fluidically coherent total volume is formed.
Der Airbag 10 weist auch wenigstens ein in der Fig. nicht dargestelltes Stellglied in Form eines Gasgenerators auf, mittels welchem die Volumenelemente 14 bzw. ihre jeweiligen Volumina und somit das Gesamtvolumen mit einem gasförmigen Medium, insbesondere Luft, beaufschlagt und somit aufgeblasen werden können bzw. kann. Durch dieses Beaufschlagen der Volumenelemente 14 mit dem gasförmigen Medium werden die Volumenelemente 14 aufgeblasen, wodurch die Stützstruktur 12 aus einer The airbag 10 also has at least one actuator, not shown in the figure, in the form of a gas generator, by means of which the volume elements 14 or their respective volumes and thus the total volume can be acted upon and thus inflated with a gaseous medium, in particular air. can. By this loading of the volume elements 14 with the gaseous medium, the volume elements 14 are inflated, whereby the support structure 12 of a
Aufbewahrungsposition in eine Rückhalteposition bewegt wird. In ihrer Rückhalteposition umgibt die Stützstruktur 12 ein Rückhaltevolumen des Airbags 10 bereichsweise. Storage position is moved to a retention position. In its retaining position, the support structure 12 surrounds a retention volume of the airbag 10 in regions.
Das Bewegen der Stützstruktur 12 aus der Aufbewahrungsposition in die Moving the support structure 12 from the storage position in the
Rückhalteposition geht mit einem sukzessiven Vergrößern des Rückhaltevolumens einher. Dadurch entsteht im Rückhaltevolumen im Vergleich zum Innenraum des Retention position is accompanied by a gradual increase in the retention volume. This results in the retention volume compared to the interior of the
Kraftwagens ein Unterdruck, wodurch ein gasförmiges Medium in Form von Luft aus dem Innenraum in das Rückhaltevolumen eingesaugt wird. Dies bedeutet, dass sich das Rückhaltevolumen infolge des Bewegens der Stützstruktur 12 in die Rückhalteposition zumindest im Wesentlichen passiv mit Luft füllt. Alternativ oder zusätzlich dazu ist es möglich, das Füllen des Rückhaltevolumens mit einem gasförmigen Medium, Motor vehicle vacuum, whereby a gaseous medium in the form of air from the interior is sucked into the retention volume. This means that the retention volume fills at least substantially passively with air due to the movement of the support structure 12 into the retention position. Alternatively or additionally, it is possible to fill the retention volume with a gaseous medium,
insbesondere Luft, mit wenigstens einem Stellglied, beispielsweise wenigstens einem Gasgenerator, zu unterstützen, und aktiv ein gasförmiges Medium, insbesondere Luft, in das Rückhaltevolumen einzublasen. in particular to support air with at least one actuator, for example at least one gas generator, and to actively inject a gaseous medium, in particular air, into the retention volume.
Das Einströmen der Luft aus dem Innenraum in das Rückhaltevolumen erfolgt dabei über Freiflächen 18 zwischen den Volumenelementen 14. Mit anderen Worten kann die Luft aus dem Innenraum durch die Freiflächen 18 zwischen den Volumenelementen 14 in das Rückhaltevolumen einströmen. The inflow of air from the interior into the retention volume takes place via open spaces 18 between the volume elements 14. In other words, the air from the interior through the open spaces 18 between the volume elements 14 can flow into the retention volume.
Der Airbag 10 umfasst auch eine Umhüllung 20, mittels welcher das Rückhaltevolumen in der Rückhalteposition zumindest bereichsweise umgeben ist. Die Umhüllung 20 ist dabei zumindest teilweise in den Freiflächen 18 angeordnet und weist Durchtrittsöffnungen 22 auf, über welche die Luft aus dem Innenraum in das Rückhaltevolumen einströmen kann. Die Umhüllung 20 weist auch eine Ventilfunktionalität auf, mittels welcher ein Ausströmen der sich in dem Rückhaltevolumen befindenden Luft aus dem Rückhaltevolumen in den Innenraum zumindest im Wesentlichen vermieden wird, wenn ein Fahrzeuginsasse aufgrund einer unfallbedingten Kraftbeaufschlagung auf den Airbag 10 auftrifft. The airbag 10 also includes an enclosure 20, by means of which the retention volume in the retention position is at least partially surrounded. The wrapper 20 is included at least partially disposed in the open spaces 18 and has passage openings 22 through which the air from the interior can flow into the retention volume. The sheath 20 also has a valve functionality, by means of which an outflow of the air in the retention volume from the retention volume into the interior is at least substantially avoided when a vehicle occupant strikes the airbag 10 due to an accidental application of force.
Infolge eines solchen Auftreffens des Fahrzeuginsassen auf den Airbag 10 kommt es im Vergleich zu einem Zeitpunkt vor dem Auftreffen, zu welchem sich die Stützstruktur 12 bereits in der Rückhalteposition befindet, zu einer Erhöhung eines in dem As a result of such an impact of the vehicle occupant on the airbag 10 occurs in comparison to a time before impact, to which the support structure 12 is already in the retaining position, to an increase in the
Rückhaltevolumen herrschenden Innendrucks. Infolge dieser Innendruckerhöhung kann der Fahrzeuginsasse sehr gut aufgefangen und rückgehalten werden. Retention volume prevailing internal pressure. As a result of this internal pressure increase, the vehicle occupant can be very well caught and retained.
Ein weiterer Vorteil des Airbags 10 ist, dass dieser als sogenannter Fachwerkbag ausgebildet ist. Die Stützstruktur 12 weist dabei eine Fachwerkstruktur auf, wobei die zumindest im Wesentlichen röhrenförmigen Volumenelemente 14 miteinander verbundene Strebenelemente der Fachwerkstruktur bilden. Dabei begrenzend die Strebenelemente (Volumenelemente 14) die Freiflächen 18. Infolge dieser Another advantage of the airbag 10 is that this is designed as a so-called truss bag. The support structure 12 in this case has a framework structure, wherein the at least substantially tubular volume elements 14 form interconnected strut elements of the truss structure. In this case, the strut elements (volume elements 14) delimits the free surfaces 18. As a result of this
fachwerkartigen Ausgestaltung der Stützstruktur 12 kann das mit dem gasförmigen Medium zu beaufschlagende Gesamtvolumen der Stützstruktur 12 gering gehalten werden. Somit kann die Stützstruktur 12 besonders schnell, d.h. in besonders kurzer Zeit aus ihrer Aufbewahrungsposition in die Rückhalteposition bewegt werden. Gleichzeitig kann die Stützstruktur 12 in ihrer Rückhalteposition ein besonders großes Volumen im Innenraum des Kraftwagens einnehmen, so dass der Fahrzeuginsasse besonders frühzeitig aufgefangen und rückgehalten werden kann. Truss-like configuration of the support structure 12, the total volume of the support structure 12 to be acted upon by the gaseous medium can be kept low. Thus, the support structure 12 may be particularly fast, i. be moved from its storage position to the retention position in a very short time. At the same time, the supporting structure 12 can assume a particularly large volume in the interior of the motor vehicle in its retaining position, so that the vehicle occupant can be caught and retained particularly early.
Um nun eine besonders vorteilhafte Dämpfungsfunktion des Airbags 10 zu realisieren, weisen die Gewebelagen bzw. die Bereiche des Gewebestücks 16 jeweilige, miteinander korrespondierende Durchströmöffnungen 24 auf. Im fertig hergestellten Zustand der Stützstruktur 12 sind die Durchströmöffnungen 24 dabei in gegenseitiger Überdeckung angeordnet. Über die Durchströmöffnungen 24 kann das sich in der Rückhalteposition im Rückhaltevolumen befindende, gasförmige Medium (Luft) zumindest teilweise aus dem Rückhaltevolumen aus- und in den Innenraum einströmen, wenn der Fahrzeuginsasse auf die Stützstruktur 12 aufprallt. Dadurch kann der infolge des Aufprallens des In order to realize a particularly advantageous damping function of the airbag 10, the fabric layers or the regions of the fabric piece 16 have respective, corresponding through-flow openings 24. In the finished state of the support structure 12, the flow openings 24 are arranged in mutual overlap. Via the through-flow openings 24, the gaseous medium (air) located in the retention volume in the retention volume can at least partially escape from the retention volume and flow into the interior space when the vehicle occupant bumps against the support structure 12. This can be due to the impact of the
Fahrzeuginsassen auf die Stützstruktur 12 zunächst sehr hohe Innendruck im Vehicle occupants on the support structure 12, first very high internal pressure in
Rückhaltevolumen kontrolliert abgebaut werden, so dass der Fahrzeuginsasse abgebremst werden kann. Die Durchströmöffnungen 24 sind dabei - bezogen auf den fertig hergestellten Zustand der Stützstruktur 12 - im Überdeckungsbereich der Gewebelagen angeordnet, wodurch sich die Gewebelagen im Bereich der Durchströmöffnungen 24 gegenseitig verstärken. Dadurch weist die Stützstruktur 12 auch im Bereich der Durchströmöffnungen 24 eine sehr hohe Robustheit und Stabilität auf. Gleichzeitig kann die Stützstruktur 12 infolge der Integration der Durchströmöffnungen 24 in die Gewebelagen besonders zeit- und kostengünstig hergestellt werden, da die Durchströmöffnungen 24 beispielweise bereits bei einem Beschnitt bzw. Zuschnitt des Gewebestücks 16, beispielsweise durch Retention volume can be reduced in a controlled manner, so that the vehicle occupant can be braked. The flow-through openings 24 are - in relation to the finished state of the support structure 12 - arranged in the overlapping region of the fabric layers, whereby the fabric layers reinforce each other in the region of the flow openings 24. As a result, the support structure 12 also has a very high robustness and stability in the region of the throughflow openings 24. At the same time, the support structure 12 can be made particularly time-consuming and cost-effective due to the integration of the flow openings 24 in the fabric layers, since the flow openings 24, for example, already at a trimming or cutting of the fabric piece 16, for example
Schneiden, Stanzen oder dergleichen, hergestellt werden können. Cutting, punching or the like, can be produced.

Claims

Patentansprüche claims
1. Airbag (10) für einen Kraftwagen, mit einer eine Mehrzahl von An air bag (10) for a motor vehicle, comprising a plurality of
Volumenelementen(14) umfassenden Stützstruktur (12), welche durch  Volume elements (14) comprehensive support structure (12), which by
Beaufschlagen der Volumenelemente (14) mit einem Medium aus einer  Applying the volume elements (14) to a medium of one
Aufbewahrungsposition in eine Rückhalteposition bewegbar ist und in ihrer Rückhalteposition ein zumindest teilweise mit einem gasförmigen Medium gefülltes Rückhaltevolumen des Airbags (10) zumindest bereichsweise umgibt,  Storage position is movable into a retaining position and at least partially surrounds in its retaining position at least partially filled with a gaseous medium retention volume of the airbag (10),
dadurch gekennzeichnet, dass  characterized in that
zumindest ein Teil der Volumenelemente (1 ) durch wenigstens zwei zumindest in einem Überdeckungsbereich in gegenseitiger Überdeckung angeordnete und miteinander verbundene Lagen gebildet ist, wobei wenigstens eine der Lagen zumindest eine Durchströmöffnung (24) aufweist, über welche das sich in dem Rückhaltevolumen befindende Medium bei einem Aufprall eines Fahrzeuginsassen auf den Airbag zumindest teilweise aus dem Rückhaltevolumen abführbar ist.  at least one part of the volume elements (1) is formed by at least two layers arranged in mutual overlap at least in an overlapping area, wherein at least one of the layers has at least one throughflow opening (24) over which the medium located in the retention volume is at Impact of a vehicle occupant on the airbag is at least partially dissipated from the retention volume.
2. Airbag (10) nach Anspruch 1 , 2. Airbag (10) according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
die Lagen in dem Überdeckungsbereich jeweilige, korrespondierende  the layers in the coverage area corresponding, respectively
Durchströmöffnungen (24) aufweisen, über welche das sich in dem  Throughflow openings (24), over which in the
Rückhaltevolumen befindende Medium bei einem Aufprall eines Fahrzeuginsassen auf den Airbag zumindest teilweise aus dem Rückhaltevolumen abführbar ist.  Residual volume located medium in an impact of a vehicle occupant on the airbag is at least partially dissipated from the retention volume.
3. Airbag (10) nach einem der Ansprüche 1 oder 2, 3. Airbag (10) according to one of claims 1 or 2,
dadurch gekennzeichnet, dass  characterized in that
die Lagen als Textillagen ausgebildet sind. the layers are formed as textile layers.
4. Airbag (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass 4. Airbag (10) according to one of the preceding claims, characterized in that
eine Umhüllung (20) vorgesehen ist, mittels welcher das Rückhaltevolumen zumindest in der Rückhalteposition zumindest bereichsweise umgeben ist.  an enclosure (20) is provided, by means of which the retention volume is at least partially surrounded in the retention position.
5. Verfahren zum Herstellen eines Airbags (10) nach einem der vorhergehenden Ansprüche. 5. A method for producing an airbag (10) according to any one of the preceding claims.
PCT/EP2013/002970 2012-10-11 2013-10-02 Airbag for a motor vehicle WO2014056586A1 (en)

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DE201210019898 DE102012019898A1 (en) 2012-10-11 2012-10-11 Airbag for motor vehicle, has support structure with part of volume elements formed by two overlapping layers having throughflow opening, through which medium is partially discharged from retention volume during impact of occupant on airbag
DE102012019898.1 2012-10-11

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970328A (en) * 1973-02-12 1976-07-20 Ab Inventing Method and blank for manufacturing shock-absorbing safety devices for vehicle passengers
US5542695A (en) * 1993-12-28 1996-08-06 R. Stresau Laboratory, Inc. Air bag deployment system
DE102006043552A1 (en) * 2006-09-12 2008-03-27 Takata-Petri Ag Gas bag for side airbag module e.g. head airbag module, of motor vehicle, has gas-permeable material section attached to gas-permeable cover section, where material section is pressed against cover section based on inner pressure of bag
DE102007052246A1 (en) 2007-11-02 2009-05-07 Daimler Ag Airbag, in particular for a motor vehicle
DE102009021854A1 (en) * 2009-05-19 2010-11-25 Daimler Ag Airbag with woven functional elements
DE102010045693A1 (en) * 2010-09-16 2011-05-05 Daimler Ag Airbag for protecting e.g. head in body of passenger of passenger car, has separative element arranged within support volume and dividing support volume into two partial chambers that are separated from each other

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970328A (en) * 1973-02-12 1976-07-20 Ab Inventing Method and blank for manufacturing shock-absorbing safety devices for vehicle passengers
US5542695A (en) * 1993-12-28 1996-08-06 R. Stresau Laboratory, Inc. Air bag deployment system
DE102006043552A1 (en) * 2006-09-12 2008-03-27 Takata-Petri Ag Gas bag for side airbag module e.g. head airbag module, of motor vehicle, has gas-permeable material section attached to gas-permeable cover section, where material section is pressed against cover section based on inner pressure of bag
DE102007052246A1 (en) 2007-11-02 2009-05-07 Daimler Ag Airbag, in particular for a motor vehicle
DE102009021854A1 (en) * 2009-05-19 2010-11-25 Daimler Ag Airbag with woven functional elements
DE102010045693A1 (en) * 2010-09-16 2011-05-05 Daimler Ag Airbag for protecting e.g. head in body of passenger of passenger car, has separative element arranged within support volume and dividing support volume into two partial chambers that are separated from each other

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