WO2003080402A1 - An air-bag - Google Patents

An air-bag Download PDF

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Publication number
WO2003080402A1
WO2003080402A1 PCT/SE2003/000399 SE0300399W WO03080402A1 WO 2003080402 A1 WO2003080402 A1 WO 2003080402A1 SE 0300399 W SE0300399 W SE 0300399W WO 03080402 A1 WO03080402 A1 WO 03080402A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
bag
reinforcement
fabric
gas
Prior art date
Application number
PCT/SE2003/000399
Other languages
French (fr)
Inventor
Ian Taylor
Original Assignee
Autoliv Development Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Autoliv Development Ab filed Critical Autoliv Development Ab
Priority to DE10392409T priority Critical patent/DE10392409B4/en
Priority to AU2003214742A priority patent/AU2003214742A1/en
Publication of WO2003080402A1 publication Critical patent/WO2003080402A1/en

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
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • 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
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R2021/23123—Heat protection panels
    • 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
    • B60R2021/23504—Inflatable members characterised by their material characterised by material
    • B60R2021/23509—Fabric
    • B60R2021/23514—Fabric coated fabric
    • 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
    • B60R2021/23533—Inflatable members characterised by their material characterised by the manufacturing process
    • B60R2021/23542—Weaving
    • B60R2021/23547—Weaving one piece weaving

Definitions

  • THE PRESENT INVENTION relates to a an air-bag, and more particularly relates to an air-bag adapted to provide protection for an occupant of a motor vehicle.
  • Many air-bags are designed to have an aperture formed therein which receives part of a gas generator, so that the gas generator has part of its housing located within the air-bag, and another part of its housing extending from the air-bag to facilitate mounting of the air-bag. On inflation of the air-bag gas emerges from that part of the air-bag housing located within the air-bag.
  • gas generators Whilst some gas generators release compressed gas, and thus produce a cold gas, other gas generators, which are of a pyrotechnic nature, produce a very hot gas, and other gas generators, which are so-called hybrid gas generators produce gas at an intermediate temperature.
  • the flow of gas at least during the initial stages of inflation of the air- bag, may be very aggressive, and thus the region of the air-bag immediately surrounding the gas generator, which may be termed the "throat" region, has to be capable of withstanding the gas flow without being compromised.
  • an additional layer of fabric in the throat region to act as a heat protective layer, especially if a pyrotechnic or hybrid gas generator is utilised.
  • This layer can be glued or stitched to the main fabric of the air-bag, or may be mounted in position by means of studs provided on the gas generator.
  • the fabric of the air-bag may be provided with a coating formed from silicone or some other similar material.
  • an air-bag the air-bag being provided with an aperture adapted to receive a gas generator, the aperture being surrounded by a throat region, the throat region being provided with a reinforcement, the reinforcement comprising two layers of fabric which form a plurality of substantially hermetically sealed cells.
  • the reinforcement is a separate reinforcement element which is additional to the fabric of the air-bag.
  • the reinforcement is formed using a one-piece weaving technique.
  • At least the reinforcement is provided with a silicone coating.
  • the reinforcement is woven in 470 Dtex yarn.
  • the reinforcement is woven in 350-235 Dtex yarn.
  • FIGURE 1 illustrates part of an air-bag provided with a reinforcement
  • FIGURE 2 illustrates part of the air-bag of Figure 1 in combination with a gas generator
  • FIGURE 3 is an enlarged view of part of Figure 2
  • FIGURE 4 is an enlarged view of part of Figure 3.
  • FIG. 1 part of an air-bag 1 formed from an appropriate fabric is shown, the air-bag having an aperture 2 adapted to receive part of a gas generator, as will be described hereinafter.
  • the air-bag is provided with a separate reinforcement sheet element 3 of annular form, having a central aperture of the same size and shape as the aperture 2.
  • the annular reinforcement element 3 is adapted to lie in the throat region of the air-bag, that is to say the region immediately surrounding the aperture 2.
  • the reinforcement element 3 is formed using a one-piece weaving technique. Such a technique is well known in the manufacture of air-bags. In using a one-piece weaving technique it is possible to weave two layers of fabric simultaneously with the weft yarns of the layers of fabric becoming interwoven between the layers of fabric so as to secure the layers of fabric together in predetermined regions to form seams or the like. In the preferred embodiment of the invention a double-woven fabric is utilised using an interchange matrix construction which may have a silicone coating.
  • the fabric may be woven using a 470 Dtex yarn, although it may be preferable to weave the fabric using a 350-235 Dtex yarn in order to improve the inherent gas-tightness of the fabric.
  • the reinforcement element 3 is woven to form two layers of fabric that are selectively interconnected to form a plurality of adjacent substantially hermetically sealed cells or chambers 4.
  • the cells or chambers 4 are shown, in Figure 1, as being of "diamond" configuration, but the cells may be of any convenient shape or configuration.
  • the cells may be contiguous, or may be spaced-apart slightly by portions of the reinforcement element which do not form part of the cell.
  • the cells may be of a honeycomb form, or a diamond pattern form, or even an offset block form, thus having a pattern resembling that of a brick wall. Cells of any particular shape may be split, and thus the details of the design of the cells are not crucial to the present invention.
  • the gas generator 5 is of conventional form having a housing which has a relatively large diameter portion 6 adapted to be located within the air-bag, and a smaller diameter portion 7 adapted to extend through the central hole in the reinforcement element 3, and through the aperture 2 formed in the air-bag 1.
  • the gas generator is shown mounted on a support 8.
  • the larger diameter portion 6 of the air-bag housing is provided with studs 9 which extend through apertures provided for that purpose within the reinforcement element 3, the fabric of the air-bag 1 and the support 8.
  • the studs may co-operate with nuts (not shown) to secure the housing in position. This technique for securing a gas generator housing in position with an air-bag is conventional.
  • the outer periphery of the larger diameter portion 6 of the housing of the gas generator 5 is provided with apertures 10 through which gas 11 will emerge when the gas generator is actuated.
  • the gas will, as it emerges from the gas generator, come into contact with the reinforcement element 3. If the gas is hot gas, because the gas generator is a pyrotechnic gas generator, or if the gas is warm gas, because the gas generator is a hybrid gas generator, the gas will inevitably warm up the air contained within the hermetically sealed cells 4 within the reinforcement element 3. The cells will consequently expand.
  • the air trapped within the cells will act as a thermal insulation layer, and thus the reinforcement element 3, when the air in the cells has expanded, will provide good thermal insulation properties, thus minimising the risk of the fabric of the air-bag becoming comprised in any way.
  • the reinforcement element 3 of the preferred embodiment of the invention is capable of withstanding the aggressive flow of gas that emerges through the apertures 10, at least during an initial stage of deployment of the air-bag.

Landscapes

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

Abstract

An air-bag (1) has an aperture (2) surrounded by a throat region (3). The throat region is provided with a reinforcement. The reinforcement comprises two layers of fabric which form a plurality of substantially hermetically sealed cells (4).

Description

"AN AIR-BAG"
THE PRESENT INVENTION relates to a an air-bag, and more particularly relates to an air-bag adapted to provide protection for an occupant of a motor vehicle. Many air-bags are designed to have an aperture formed therein which receives part of a gas generator, so that the gas generator has part of its housing located within the air-bag, and another part of its housing extending from the air-bag to facilitate mounting of the air-bag. On inflation of the air-bag gas emerges from that part of the air-bag housing located within the air-bag. Whilst some gas generators release compressed gas, and thus produce a cold gas, other gas generators, which are of a pyrotechnic nature, produce a very hot gas, and other gas generators, which are so-called hybrid gas generators produce gas at an intermediate temperature.
The flow of gas, at least during the initial stages of inflation of the air- bag, may be very aggressive, and thus the region of the air-bag immediately surrounding the gas generator, which may be termed the "throat" region, has to be capable of withstanding the gas flow without being compromised. In order to minimise the risk of damage occurring to the fabric of the air-bag, it has been proposed to provide an additional layer of fabric in the throat region to act as a heat protective layer, especially if a pyrotechnic or hybrid gas generator is utilised. This layer can be glued or stitched to the main fabric of the air-bag, or may be mounted in position by means of studs provided on the gas generator. Alternatively the fabric of the air-bag may be provided with a coating formed from silicone or some other similar material.
It is inconvenient to have many different versions of heat protective layer, and the present invention seeks to provide an improved air-bag.
According to this invention there is provided an air-bag, the air-bag being provided with an aperture adapted to receive a gas generator, the aperture being surrounded by a throat region, the throat region being provided with a reinforcement, the reinforcement comprising two layers of fabric which form a plurality of substantially hermetically sealed cells.
Preferably the reinforcement is a separate reinforcement element which is additional to the fabric of the air-bag.
Conveniently the reinforcement is formed using a one-piece weaving technique.
Preferably at least the reinforcement is provided with a silicone coating.
Advantageously the reinforcement is woven in 470 Dtex yarn.
Alternatively the reinforcement is woven in 350-235 Dtex yarn.
In order that the invention may be more readily understood, and so that further features thereof maybe appreciated, the invention will now be described, by way of example, with reference to the accompanying drawings in which: FIGURE 1 illustrates part of an air-bag provided with a reinforcement,
FIGURE 2 illustrates part of the air-bag of Figure 1 in combination with a gas generator,
FIGURE 3 is an enlarged view of part of Figure 2, and
FIGURE 4 is an enlarged view of part of Figure 3.
Referring initially to Figure 1 of the accompanying drawings, part of an air-bag 1 formed from an appropriate fabric is shown, the air-bag having an aperture 2 adapted to receive part of a gas generator, as will be described hereinafter.
In the illustrated embodiment, the air-bag is provided with a separate reinforcement sheet element 3 of annular form, having a central aperture of the same size and shape as the aperture 2. The annular reinforcement element 3 is adapted to lie in the throat region of the air-bag, that is to say the region immediately surrounding the aperture 2. The reinforcement element 3 is formed using a one-piece weaving technique. Such a technique is well known in the manufacture of air-bags. In using a one-piece weaving technique it is possible to weave two layers of fabric simultaneously with the weft yarns of the layers of fabric becoming interwoven between the layers of fabric so as to secure the layers of fabric together in predetermined regions to form seams or the like. In the preferred embodiment of the invention a double-woven fabric is utilised using an interchange matrix construction which may have a silicone coating. The fabric may be woven using a 470 Dtex yarn, although it may be preferable to weave the fabric using a 350-235 Dtex yarn in order to improve the inherent gas-tightness of the fabric.
The reinforcement element 3 is woven to form two layers of fabric that are selectively interconnected to form a plurality of adjacent substantially hermetically sealed cells or chambers 4. The cells or chambers 4 are shown, in Figure 1, as being of "diamond" configuration, but the cells may be of any convenient shape or configuration. The cells may be contiguous, or may be spaced-apart slightly by portions of the reinforcement element which do not form part of the cell. Thus, in alternative embodiments of the invention, the cells may be of a honeycomb form, or a diamond pattern form, or even an offset block form, thus having a pattern resembling that of a brick wall. Cells of any particular shape may be split, and thus the details of the design of the cells are not crucial to the present invention.
Turning now to Figure 2, the combination of the air-bag 1 and the reinforcement element 3 are illustrated together with a gas generator 5. The gas generator 5 is of conventional form having a housing which has a relatively large diameter portion 6 adapted to be located within the air-bag, and a smaller diameter portion 7 adapted to extend through the central hole in the reinforcement element 3, and through the aperture 2 formed in the air-bag 1. The gas generator is shown mounted on a support 8. The larger diameter portion 6 of the air-bag housing is provided with studs 9 which extend through apertures provided for that purpose within the reinforcement element 3, the fabric of the air-bag 1 and the support 8. The studs may co-operate with nuts (not shown) to secure the housing in position. This technique for securing a gas generator housing in position with an air-bag is conventional. As can be seen from Figure 3, the outer periphery of the larger diameter portion 6 of the housing of the gas generator 5 is provided with apertures 10 through which gas 11 will emerge when the gas generator is actuated. The gas will, as it emerges from the gas generator, come into contact with the reinforcement element 3. If the gas is hot gas, because the gas generator is a pyrotechnic gas generator, or if the gas is warm gas, because the gas generator is a hybrid gas generator, the gas will inevitably warm up the air contained within the hermetically sealed cells 4 within the reinforcement element 3. The cells will consequently expand. The air trapped within the cells will act as a thermal insulation layer, and thus the reinforcement element 3, when the air in the cells has expanded, will provide good thermal insulation properties, thus minimising the risk of the fabric of the air-bag becoming comprised in any way. The reinforcement element 3 of the preferred embodiment of the invention is capable of withstanding the aggressive flow of gas that emerges through the apertures 10, at least during an initial stage of deployment of the air-bag.
Whilst, in the described embodiment, a separate reinforcing element has been described, it is to be appreciated that a reinforcing element incorporating the hermetically sealed cells may be incorporated integrally with the air-bag.
In the present Specification "comprises" means "includes or consists of and "comprising" means "including or consisting of.

Claims

CLAIMS:
1. An air-bag, the air-bag being provided with an aperture adapted to receive a gas generator, the aperture being surrounded by a throat region, the throat region being provided with a reinforcement, the reinforcement comprising two layers of fabric which form a plurality of substantially hermetically sealed cells.
2. An air-bag according to Claim 1 wherein the reinforcement is a separate reinforcement element which is additional to the fabric of the air-bag.
3. An air-bag according to any one of the preceding Claims wherein the reinforcement is formed using a one-piece weaving technique.
4. An air-bag according to any one of the preceding Claims wherein at least the reinforcement is provided with a silicone coating.
5. An air-bag according to any one of the preceding Claims wherein the reinforcement is woven in 470 Dtex yarn.
6. An air-bag according to any one of Claims 1 to 4 wherein the reinforcement is woven in 350-235 Dtex yarn.
PCT/SE2003/000399 2002-03-27 2003-03-11 An air-bag WO2003080402A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10392409T DE10392409B4 (en) 2002-03-27 2003-03-11 air bag
AU2003214742A AU2003214742A1 (en) 2002-03-27 2003-03-11 An air-bag

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0207244.5 2002-03-27
GB0207244A GB2386870B (en) 2002-03-27 2002-03-27 Improvements in or relating to an air-bag

Publications (1)

Publication Number Publication Date
WO2003080402A1 true WO2003080402A1 (en) 2003-10-02

Family

ID=9933828

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/000399 WO2003080402A1 (en) 2002-03-27 2003-03-11 An air-bag

Country Status (4)

Country Link
AU (1) AU2003214742A1 (en)
DE (1) DE10392409B4 (en)
GB (1) GB2386870B (en)
WO (1) WO2003080402A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726492A3 (en) * 2005-05-24 2008-07-16 TRW Automotive Safety Systems GmbH Airbag
EP3305603A1 (en) * 2016-10-07 2018-04-11 Autoliv Development AB An air-bag

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040877A1 (en) * 2008-07-31 2010-02-04 Zf Lenksysteme Gmbh Device for use in steering system of vehicle for locking steering, has locking unit, which is arranged on low momentum side of steering system, where locking unit has spring element
DE102021118314A1 (en) * 2020-11-25 2022-05-25 Zf Automotive Germany Gmbh gas bag fabric

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131677A (en) * 1990-03-29 1992-07-21 Toyoda Gosei Co., Ltd. Air bag device
US5294148A (en) * 1991-07-29 1994-03-15 Ikeda Bussan Co., Ltd. Reinforcement structure for vehicle airbag and method of producing the same
US5447330A (en) * 1992-10-30 1995-09-05 Takata Corporation Air bag having flameproof sheet protecting inflator and vent region
FR2724144A1 (en) * 1994-09-02 1996-03-08 Aerazur Method for assembly of air bags by sewing

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3586347A (en) * 1969-06-05 1971-06-22 Eaton Yale & Towne Safety device
US3638755A (en) * 1970-12-14 1972-02-01 Allied Chem Outer energy absorber for air-bag-restraint system
JPH0534285Y2 (en) * 1987-02-05 1993-08-31
GB8903559D0 (en) * 1989-02-16 1989-04-05 Marling Ind Plc Air bag
GB2282995B (en) * 1990-11-30 1995-07-12 Takata Corp Air bag attaching structure of air bag device
DE19534483A1 (en) * 1995-09-16 1997-03-20 Temic Bayern Chem Airbag Gmbh Airbag system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131677A (en) * 1990-03-29 1992-07-21 Toyoda Gosei Co., Ltd. Air bag device
US5294148A (en) * 1991-07-29 1994-03-15 Ikeda Bussan Co., Ltd. Reinforcement structure for vehicle airbag and method of producing the same
US5447330A (en) * 1992-10-30 1995-09-05 Takata Corporation Air bag having flameproof sheet protecting inflator and vent region
FR2724144A1 (en) * 1994-09-02 1996-03-08 Aerazur Method for assembly of air bags by sewing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726492A3 (en) * 2005-05-24 2008-07-16 TRW Automotive Safety Systems GmbH Airbag
EP3305603A1 (en) * 2016-10-07 2018-04-11 Autoliv Development AB An air-bag
WO2018065477A1 (en) * 2016-10-07 2018-04-12 Autoliv Development Ab An air-bag

Also Published As

Publication number Publication date
DE10392409T5 (en) 2005-06-30
DE10392409B4 (en) 2006-07-13
GB2386870A (en) 2003-10-01
GB2386870B (en) 2005-03-16
AU2003214742A1 (en) 2003-10-08
GB0207244D0 (en) 2002-05-08

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