WO2008034479A1 - Procédé de fabrication d'une poche à gaz pour un système d'airbag, et poche à gaz fabriquée d'après ce procédé - Google Patents

Procédé de fabrication d'une poche à gaz pour un système d'airbag, et poche à gaz fabriquée d'après ce procédé Download PDF

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Publication number
WO2008034479A1
WO2008034479A1 PCT/EP2007/006343 EP2007006343W WO2008034479A1 WO 2008034479 A1 WO2008034479 A1 WO 2008034479A1 EP 2007006343 W EP2007006343 W EP 2007006343W WO 2008034479 A1 WO2008034479 A1 WO 2008034479A1
Authority
WO
WIPO (PCT)
Prior art keywords
seams
airbag
coating
fabric layers
chambers
Prior art date
Application number
PCT/EP2007/006343
Other languages
German (de)
English (en)
Inventor
Markus Gottschalk
Original Assignee
Automotive Safety Components
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 Automotive Safety Components filed Critical Automotive Safety Components
Publication of WO2008034479A1 publication Critical patent/WO2008034479A1/fr

Links

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
    • B60R21/235—Inflatable members characterised by their material
    • 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
    • B60R21/235—Inflatable members characterised by their material
    • B60R2021/23571—Inflatable members characterised by their material characterised by connections between panels
    • B60R2021/23595—Sealing

Definitions

  • the invention relates to a method according to the preamble of claim 1. It further relates to a gas bag produced by this method.
  • the pressure under which the gas bag of an airbag is after the initiation of an inflation process should follow a timed sequence, so that must be given to this process adapted global gas permeability. This means that in the manufacture of the airbag, the surface portions of sutures and other portions differing from one another in the gas permeability must be taken into account. In any case, seams are simply considered areas of increased gas permeability, which regularly require special treatment.
  • a partial coating of tissue parts which are to be sewn in a subsequent process step to a gas bag of an airbag system, is also known from DE 40 28 637 A1.
  • tissue parts which are to be sewn in a subsequent process step to a gas bag of an airbag system
  • DE 40 28 637 A1 A partial coating of tissue parts, which are to be sewn in a subsequent process step to a gas bag of an airbag system.
  • the partial coating serves to provide zones of the fabric whose suitability for cutting and sewing is improved.
  • Airbag systems are arranged in the vehicle depending on the intended protective effect or the underlying risk situation at defined locations and adapted in shape to their respective function.
  • An important application is a side airbag system, which is intended to provide protection against the vehicle occupant side effects, especially in the event of a vehicle rollover. (Roll over protection)
  • the gas bag of such a side airbag or curtain airbag system is characterized by a, in the deployment case, a planar buffer zone representing structure, which in the general case of two spaced apart, a series of juxtaposed chambers comprising main layers is formed, to which in general the demand for a certain service life is made, according to which an initial gas pressure must not drop by more than 50% after a defined period of, for example, 8 seconds.
  • a planar structure of the main layers of the airbag is generally achieved by dividing the interior thereof into a number of chambers by an arrangement of seams, by means of which mutually opposite layers are interconnected, the size and areal distribution of which simulates said planar structure. This means that a more or less complex seam pattern has to be created according to the shape and size of the chambers.
  • Gas bags for such side airbag systems are known in the form of woven airbags in which the actual airbag including an array of seams bounding said chambers are formed in a unitary operation.
  • the fabric as a whole is coated with a coating material according to a high basis weight or, alternatively, the fabric is laminated with a film. The latter measures are required by the manufacturer to ensure a required service life of the airbag during deployment.
  • Such gas bags are also known in sewn form, with two fabric layers are sewn together as a rule, with the proviso that in turn a flat structure is formed by a juxtaposition of chambers bounded by seams.
  • For the production of this type of gas bags is based on fabric layers, which are coated on one side, that is regularly inside with a relatively thin coating of silicone. These layers of fabric are first glued together in the area of the seams, wherein adhesive is initially applied according to the course of the seams and can be glued to the inside coating material. Subsequently, the fabric layers are sewn together in the region of the strip-like bonds.
  • the known woven gas bags have a high packing volume due to the extensive use of expensive coating materials.
  • a similar disadvantage arises in sewn gas bags by the comparatively thick adhesive layers used there.
  • the bonding represents a comparatively expensive working step.
  • both the production and the service properties of these known gas bags can not be regarded as satisfactory.
  • US 2003/0178823 A1 discloses a gas bag intended for use in the context of a curtain airbag system.
  • This is made of a synthetic fiber fabric, which is coated with a rubber-containing material, and in accordance with a coating thickness at the seaming areas with 50 to 200 g / m 2 and the rest with is measured at about 30 g / m 2 .
  • Besi ichtungstechnikstoff include a chloroprene, silicone or urethane rubber into consideration.
  • the fabric is first cut to size and then manually coated with said coating material, specifically with a specially adapted tool which is set up to produce different coating thicknesses in accordance with a predetermined seam pattern. Subsequently, the fabric pieces prepared in this way are sewn together at the thus prepared locations. The aim is to achieve a defined gas outlet in the seam area.
  • tissue parts are assumed which are further processed by cutting and subsequent sewing into a gas bag, wherein the tissue parts are coated in the seam area or are coated in accordance with a coating thickness increased in relation to other areas.
  • tissue parts are coated in the seam area or are coated in accordance with a coating thickness increased in relation to other areas.
  • fabric parts are used, which have been treated before the suturing and cutting by modified coating methods.
  • the coating of the seams is carried out according to the features of claim 2 in a screen printing process. This opens up a rational cost-effective production possibility, in particular with a multiplicity of seams or a seam pattern complicated in the surface.
  • the method is used in sewn gas bags, where it is assumed, for example, of cut and one side thin coated fabric layers.
  • the said thin coating may in this case have a thickness of about 20 g / m 2 to 30 g / m 2 and also serves to influence the gas permeability of the fabric layers.
  • fabric layers are regularly used, the inner surface of which is coated thinly with respect to the gas bag.
  • the method finds application in woven airbags, in which the fabric layers and the seams or joints delimiting the chambers are produced by weaving means.
  • a thin coating which is directed to an improvement in the sealing effect of the fabric layers, in particular the setting of a defined gas permeability known - with respect to the airbag - applied externally to the fabric layers.
  • the method according to the invention eliminates relatively expensive bonding operations and minimizes the use of even expensive coating materials in an extremely rational manner. Additional coating materials are thus used only at the locations of the gas bag, which require additional sealing measures as a result of a seam formation, due to the otherwise only thin precoating.
  • a gas bag produced by the method according to the invention is thus characterized according to the features of claims 7 to 9 by fabric layers, either outside or inside wear a thin pre-coating, in each case seams are additionally coated on the outside.
  • the thickness of the pre-coating as well as the additional coating in the region of the seams is created with a view to the setting of a defined gas permeability, taking into account a desired service life of the airbag after initial deployment.
  • the gas bag is characterized by a low packing volume and the resulting favorable folding properties.
  • the gas bag according to the invention is one for a side airbag system. This is characterized by a multiplicity of chambers arranged next to one another, which together form a planar, protective effect-imparting structure. Such a gas bag is characterized by a plurality of seams or comparable connections of the opposing at least two fabric layers, which serve to delimit said chambers from each other.
  • the material used for the outside coating of the seams is identical to the material otherwise used in the context of the thin coating of the fabric layers.
  • both in the context of the thin pre-coating and in the additional coating of the seams silicone is used, a material that meets all requirements for airbag systems.
  • FIG. 1 is an enlarged partial view of a first embodiment of an inventively designed seam region of a gas bag.
  • Fig. 2 is an enlarged partial view of a second embodiment of an inventively designed seam portion of a gas bag.
  • Fig. 1 shows a sectional view of the wall structure of the airbag of a so-called side airbag system, in which two conventional fabric layers 1, 2 in accordance with defined distances 3 with each other perpendicular to the plane extending seams 4 communicate with each other.
  • the fabric layers are inside, that is, on the sides facing each other with a comparatively thin layer 5 of a gas-impermeable material, eg. B. silicone coated.
  • a gas-impermeable material eg. B. silicone coated.
  • the seams 5 laterally delimit respective chambers 6, whose shape and arrangement form the planar structure of the gas bag which fulfills a buffer function in the deployed active state.
  • FIG. 2 also shows in a partial view an airbag of a side airbag system of the OPW type (One Piece Woven).
  • OPW One Piece Woven
  • the fabric layers 1 ' , 2 ' can be a one-piece or one-piece fabric layer.
  • the region of the seams 9 is coated with strip-shaped coatings 12 to improve the sealing effect.
  • This coating which is limited to the seam area and extends along the entire length of the seams, may also be made of silicone.

Landscapes

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

Abstract

Une poche à gaz à utiliser dans un système d'airbag latéral est caractérisée par deux couches de tissu (1, 2) en vis-à-vis, qui sont mutuellement reliées par des coutures (4) selon des espacements identiques (3), de sorte que des compartiments (6) sont formés. Dans l'état déplié de la poche à gaz, l'ensemble de ces compartiments (6) forme une structure surfacique destinée à exercer une action de protection. Les couches de tissu (1, 2) sont coupées à dimension et revêtues sur leur côté intérieur d'une mince couche (5) de silicone. Afin d'améliorer l'étanchéité dans la région des coutures (4), celles-ci sont revêtues sur le côté extérieur d'une enduction (7) de silicone. L'application de cette enduction peut s'effectuer de façon particulièrement rationnelle par sérigraphie. On obtient une poche à gaz présentant un faible volume de rangement et de bonnes propriétés de pliage.
PCT/EP2007/006343 2006-09-18 2007-07-18 Procédé de fabrication d'une poche à gaz pour un système d'airbag, et poche à gaz fabriquée d'après ce procédé WO2008034479A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006044385.3 2006-09-18
DE200610044385 DE102006044385A1 (de) 2006-09-18 2006-09-18 Verfahren zur Herstellung eines Gassackes für ein Airbag-System und nach diesem Verfahren hergestellter Gassack

Publications (1)

Publication Number Publication Date
WO2008034479A1 true WO2008034479A1 (fr) 2008-03-27

Family

ID=38514252

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/006343 WO2008034479A1 (fr) 2006-09-18 2007-07-18 Procédé de fabrication d'une poche à gaz pour un système d'airbag, et poche à gaz fabriquée d'après ce procédé

Country Status (2)

Country Link
DE (1) DE102006044385A1 (fr)
WO (1) WO2008034479A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013009764B4 (de) * 2013-06-10 2019-04-18 Global Safety Textiles Gmbh Nahtkonstruktion für ein Gewebe für einen OPW-Airbag

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0962363A1 (fr) * 1998-06-01 1999-12-08 Takata Corporation Coussin gonflable
DE19852232A1 (de) * 1998-11-12 2000-05-18 Takata Europ Gmbh Aufblasbarer Luftsack für Kraftfahrzeuge

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028637A1 (de) * 1990-09-08 1992-03-12 Akzo Gmbh Verfahren zum partiellen beschichten von geweben
US5110666A (en) * 1991-05-06 1992-05-05 Reeves Brothers, Inc. Coated fabric structure for air bag applications
US5538280A (en) * 1994-09-30 1996-07-23 Highland Industries, Inc. Anti-ravel airbag fabric reinforcement
DE29908210U1 (de) * 1999-05-07 1999-09-16 Trw Repa Gmbh Gassack
US6435543B1 (en) * 1999-12-20 2002-08-20 Trw Inc. Inflatable side curtain
KR100658384B1 (ko) * 2000-08-25 2006-12-15 주식회사 코오롱 사이드 커튼타입의 에어백용 원단, 그의 제조방법 및 그의사이드 커튼타입 에어백

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0962363A1 (fr) * 1998-06-01 1999-12-08 Takata Corporation Coussin gonflable
DE19852232A1 (de) * 1998-11-12 2000-05-18 Takata Europ Gmbh Aufblasbarer Luftsack für Kraftfahrzeuge

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Publication number Publication date
DE102006044385A1 (de) 2008-03-27

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