WO2020078881A1 - Unité de fermeture pour coussin gonflable et coussin gonflable - Google Patents

Unité de fermeture pour coussin gonflable et coussin gonflable Download PDF

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Publication number
WO2020078881A1
WO2020078881A1 PCT/EP2019/077736 EP2019077736W WO2020078881A1 WO 2020078881 A1 WO2020078881 A1 WO 2020078881A1 EP 2019077736 W EP2019077736 W EP 2019077736W WO 2020078881 A1 WO2020078881 A1 WO 2020078881A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
closure
ignition
gas bag
ignition unit
Prior art date
Application number
PCT/EP2019/077736
Other languages
German (de)
English (en)
Inventor
Daniele Aranzulla
Martin Burkhardtsmaier
Bernd Issler
Jens Debler
Original Assignee
Trw Automotive Gmbh
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 Trw Automotive Gmbh filed Critical Trw Automotive Gmbh
Publication of WO2020078881A1 publication Critical patent/WO2020078881A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/239—Inflatable members characterised by their venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/239—Inflatable members characterised by their venting means
    • B60R2021/2395—Inflatable members characterised by their venting means comprising means to control the venting

Definitions

  • the invention relates to a closure unit for an airbag of a motor vehicle safety device and an airbag for a motor vehicle safety device.
  • the inflation behavior of a gas bag can be controlled via openings in a gas bag jacket of the gas bag, through which an inflation gas can flow that has been generated by a gas generator for inflating the gas bag.
  • Closure elements are usually assigned to the openings, which can be controlled in order to control the amount of gas flowing out through the openings. This allows, among other things, the hardness of the gas bag to be adjusted or the inflation behavior of the gas bag to be adapted to the vehicle occupant, for example its seating position and / or its weight.
  • Such an airbag is described, for example, in DE 10 2007 058 656 A1, where a closure element is provided which comprises a plurality of outflow openings.
  • the closure element is attached to an opening in the gas bag jacket of the gas bag in such a way that it forms an extension of the gas bag wall that can be folded outwards and inwards.
  • the closure element is connected to a tether and pulled over the tether into the interior of the gas bag in order to close the outflow openings. To open the outflow openings, the closure element is pressed outwards by the gas bag.
  • an airbag which has a closure element which is provided at an opening in the airbag jacket of the airbag, the closure element being coupled via a tether to a release device which releases the tether.
  • the object of the invention is to improve the ventilation of a gas bag, so that a quick ventilation of the gas bag is possible if this is desired.
  • a closure unit for a gas bag of a motor vehicle safety device comprising an electrical ignition unit and a plurality of closure elements, via which an opening in a gas bag jacket of the gas bag can be closed when the ignition unit is not activated, the ignition unit being on one of the closure elements is attached.
  • the invention relates to an airbag for a motor vehicle safety device, with at least one opening provided in an airbag jacket, to which a closure unit of the aforementioned type is assigned.
  • the release device provided for opening the closure unit is in the form of an electrical ignition unit which is attached directly to one of the closure elements.
  • the clearance complexity of the opening in the gas bag jacket is considerably reduced.
  • the effectiveness of the outflow of the gas is increased, since a faster and more targeted ventilation of the gas bag is possible.
  • the opening time which results from the activation time and the reaction time, is increased, as a result of which the ventilation of the gas bag is improved.
  • closure elements which close the opening in the non-activated state of the ignition unit, therefore together form a gas-tight cover layer which covers and seals the opening in the gas bag jacket.
  • the closure elements are in particular formed separately from the gas bag jacket.
  • the electrical ignition unit is the component that receives an electrical signal and this in a mechanical pulse implemented to release the opening in the gas bag jacket. Since the electrical ignition unit is arranged directly on one of the closure elements, it is therefore not necessary to use a transmission element such as a tether or the like which acts between a corresponding release device and the closure elements.
  • the arrangement of the electrical ignition unit directly on the closure element ensures that no high tensile forces occur on the closure elements, that is to say the components which cover the opening in the gas bag jacket in order to close the opening in a gas-tight manner. As a result, the manufacturing outlay of the closure unit and that of the gas bag is reduced accordingly.
  • the closure unit can be completely pre-assembled.
  • the closure unit can then be coupled to the gas bag jacket, in particular sewn to the gas bag jacket.
  • the closure unit and thus also the gas bag can be manufactured in the flat state, which reduces the manufacturing effort accordingly.
  • the closure unit can be prefabricated separately and then connected, in particular sewn, to the gas bag jacket. This results in a simple manufacture of the gas bag by connecting the closure unit to the gas bag jacket in the area of the opening in the gas bag jacket.
  • the closure unit has a ring-shaped base support which can be fastened to the gas bag jacket, in particular wherein the plurality of closure elements are connected to the base support, for example are sewn.
  • the gas bag comprises a ring-shaped base carrier of the closure unit, which is attached to the gas bag jacket of the gas bag, wherein the plurality of closure elements can be connected to the base carrier, in particular are sewn.
  • the closure elements can be aligned in a defined manner with respect to one another in advance in order to achieve a defined opening behavior of the closure unit or the closure elements when the ignition unit is activated.
  • the plurality of closure elements can be connected directly to the gas bag, in particular sewn, without a base carrier.
  • the closure elements can first be assembled into a circular closure unit in the manner of bleeds or scales.
  • the closure elements can first be connected to one another, in particular sewn, in a region of the connection and / or overlap sections.
  • the closure elements can also be aligned with one another beforehand in a defined form in order to achieve a defined opening behavior of the closure unit or the closure elements when the ignition unit is activated.
  • a completely pre-assembled closure unit can also be created as a result.
  • the plurality of closure elements each have an ignition unit section, in which a recess is provided, through which the ignition unit extends at least partially.
  • a compact closure unit is created in which the ignition unit is directly assigned to the closure elements which close the openings in the gas bag jacket when the ignition unit is not activated. This also ensures that the ignition unit is held securely on the closure elements, since these together provide a corresponding connection point for the ignition unit.
  • the plurality of closure elements can partially overlap when viewed from the outside of the closure unit, in particular the ignition unit sections.
  • the overlapping arrangement of the closure elements ensures that the closure unit, that is to say the cover layer formed by the closure elements, is designed to be appropriately gas-tight in order to seal the opening in the gas bag jacket.
  • closure element to which the ignition unit is attached, completely contributes to the outside of the closure unit. This makes it easier to open the closure unit if the electrical ignition unit is ignited, since the other closure elements to which the ignition unit is not attached all have a similar opening behavior. The only difference from this is the closure element to which the ignition unit is attached, because the ignition unit arranged thereon the weight and thus also the inherent stability of the closure element with the ignition unit changes compared to the closure elements without the ignition unit.
  • the ignition unit can have two housing sections, each of which has a contact section.
  • the ignition unit can therefore be made in several parts.
  • the housing sections are detachably coupled, for example in order to convert the electrical pulse into a mechanical pulse, in particular whereby the closure elements and thus the opening in the gas bag jacket are released.
  • the closure elements can rest on the contact sections via their ignition unit sections, so that they are held in a defined manner by the ignition unit.
  • the two housing sections enclose an ignition chamber in which ignition material is accommodated, the two housing sections detaching from one another when the ignition unit is activated.
  • the two housing sections can accordingly be detached from one another when the ignition material of the ignition unit is ignited.
  • the ignition unit accordingly represents a type of detonator capsule in order to open the closure unit and to open the opening in the gas bag jacket.
  • a further aspect provides that the closure elements are received in a form-fitting manner between the two housing sections, in particular wherein the closure elements are received in a form-fitting manner via ignition unit sections between the two housing sections.
  • the closure elements can each overlap, in particular over their ignition unit sections.
  • Two closure elements can then serve as outer layers of the ignition unit sections of the closure elements, which are configured as a stack and which are directly assigned to, or bear against, the contact sections of the housing sections. This results in a compact design of the entire closure unit.
  • the two housing halves therefore extend at least partially through the stack which is formed by the closure elements in the overlap region of the ignition unit sections.
  • the closure elements are held in the closed state by the ignition unit, in particular the two housing sections, and at the same time the ignition unit is held in the correct position.
  • one of the two housing sections is firmly connected to the one of the closure elements, in particular wherein at least one holding position for fixing the ignition unit is assigned to the one closure element.
  • the housing section is arranged in a form-fitting manner on the closure element via its contact section, the housing section additionally being fixed on the closure element via the holding position, so that this housing section is positively fixed on the closure element in all directions.
  • the ignition unit can be designed as a push-button igniter. As a result, the ignition unit can be designed in a simple and inexpensive manner.
  • the ignition unit can have an electrical line via which the ignition unit receives the control command for ignition, in particular wherein the electrical line extends through the airbag interior surrounded by the airbag jacket.
  • the electrical line can lead to a control unit via which the ignition unit receives the control command to open the closure unit in order to open the opening in the gas bag jacket, so that the gas bag can be ventilated.
  • the electrical signal is therefore converted into a mechanical pulse by the ignition unit in order to open the opening in the gas bag jacket.
  • the electrical line can be designed, for example, as a flat cable and / or a fabric tape with integrated ignition lines.
  • the ignition lines can be woven into the fabric tape.
  • the closure unit can be assigned to an outside or an inside of the gas bag jacket.
  • the annular base support can be connected to the gas bag jacket, in particular sewn.
  • the ring-shaped base support and the closure elements can also be connected, in particular sewn, to the gas bag jacket.
  • several concentric circular seams can be used here.
  • closure elements can be assigned to an outside of the gas bag casing and / or the ring-shaped base support can be assigned to an inside of the gas bag casing.
  • FIG. 1 shows a schematic partial illustration of an airbag according to the invention with a closure unit according to the invention
  • FIG. 2 shows an exploded view of the closure unit from FIG. 1,
  • FIG. 3 shows a schematic illustration of the ignition unit of the closure unit from FIG. 2 in the triggered or activated state
  • FIG. 4 shows a perspective partial illustration of the gas bag according to the invention with the closure unit according to the invention from the outside
  • FIG. 5 shows an interior view of the gas bag from FIG. 4,
  • FIG. 6 shows the gas bag from FIG. 4 in the open state
  • Figure 7 is a plan view of the gas bag in the open state.
  • FIG. 1 A gas bag 10 for a motor vehicle safety device of a motor vehicle is partially shown in FIG. 1.
  • the airbag 10 comprises an airbag jacket 12, which is shown from the inside in FIG. 1. Accordingly, the inside of the gas bag jacket 12 is partially shown in FIG. 1.
  • the airbag 10 comprises a closure unit 14 which is assigned to an opening 16 in the airbag jacket 12, the opening 16 being covered by the closure unit 14.
  • the closure unit 14 is accordingly in the non-activated state, so that no gas can escape from the gas bag interior via the opening 16 to the surroundings.
  • the closure unit 14 comprises an electrical ignition unit 18, which can be coupled via an electrical line 20, at the end of which a plug 22 is provided, to a plug connector 24, which leads, for example, to a control unit of the motor vehicle, not shown here, for example a control unit of the motor vehicle Security device.
  • the electrical ignition unit 18 receives an electrical control signal to be ignited, which is generated by the control device of the motor vehicle, as will be explained below.
  • the closure unit 14 also comprises a plurality of closure elements 26, each of which is fastened to a ring-shaped base support 28 which is connected to the gas bag jacket 12 and has a central recess 29, as can be seen from FIG. 2.
  • the closure unit 14 comprises at least one holding position 30, which is shown separately in FIG. 2, in which the closure unit 14 is shown in an exploded view.
  • FIG. 2 also shows the shape of the individual closure elements 26, six of which are connected to the base support 28 in the embodiment shown in FIG.
  • the closure elements 26 each comprise a connecting section 31, via which they are connected or sewn to the base support 28, and an ignition unit section 32, which has a recess 34.
  • the closure elements 26 are sewn over the respective connecting sections 31 to the base support 28.
  • the respective connecting sections 31 are essentially in the form of part circles, so that they can each be assigned to a region of the essentially circular base support 28.
  • closure elements 26 are connected to the base support 28 before the closure unit 14 is coupled to the gas bag jacket 12. Accordingly, the closure unit 14 is a prefabricated component which is first manufactured and then connected to the gas bag jacket 12.
  • closure elements 26 can be connected, in particular sewn, directly to the gas bag jacket 12 in the region of the connecting sections 31.
  • the base carrier 28 can then be sewn to the gas bag jacket 12.
  • closure elements 26 can then also be sewn to the gas bag jacket 12. It can be provided that the closure unit 14 is arranged on an inside or an outside of the gas bag casing 12. In particular, the base support 28 and / or the closure elements 26 can be connected to the gas bag jacket 12 via concentric seams 48, 52 (see FIGS. 4 to 7).
  • the base carrier 28 bears against an inside of the gas bag jacket 12, whereas the closure elements 26 attached to the base carrier 28 are at least partially assigned to an outside of the gas bag jacket 12. Accordingly, the edge of the opening 16 of the gas bag casing 12 is received between the base support 28 and the closure elements 26. This increases the tightness of the closure unit 14.
  • closure elements 26 can each have an overlap section 35, which is provided between the connection section 31 and the edge of the respective closure element 26.
  • the overlap section 35 and the ignition unit section 32 are accordingly formed at opposite ends of the closure elements 26.
  • the closure unit 14 can be coupled to the gas bag casing 12 in such a way that the central recess 29 and the opening 16 in the gas bag casing 12 are essentially flush with one another or at least their central axes coincide, provided the central recess 29 and the opening 16 should be of different sizes.
  • the individual closure elements 26 are each coupled to the base support 28 via their connecting sections 31 such that their ignition unit sections 32 overlap like scales in the central region of the closure unit 14, that is to say in the region of the central recess 33 of the base support 28.
  • the ignition unit sections 32 overlap in such a way that the respective cutouts 34 of the closure elements 26 are aligned with one another, so that a stack results which has a continuous cutout.
  • the ignition unit 18 then extends through the aligned recesses 34 of the closure elements 26, so that the ignition unit 18 is held securely.
  • the holding position 30, which is arranged on the outside of the closure unit 14, is provided for fastening the ignition unit 18 to one of the closure elements 26, as will be explained below.
  • FIG. 2 which comprises two housing sections 36, 38 and an ignition chamber 40 enclosed by the two housing sections 36, 38, in which ignition material 42 is accommodated.
  • the two housing sections 36, 38 each have contact sections 44 which, when the ignition unit 18 is assembled, point to one another, that is to say are arranged opposite one another.
  • the two contact sections 44 define an annular receiving space 46 in which the respective positions of the closure elements 26 can be accommodated, that is to say their ignition unit sections 32.
  • the closure elements 26 are thus held positively by the ignition unit 18 in the assembled state of the closure unit 14.
  • the ignition unit 18 is simultaneously fixed to one of the closure elements 26, namely via the at least one holding position 30 arranged from the outside.
  • the ignition unit 18 receives a control signal via its electrical line 20, the ignition material 42 is ignited in the ignition chamber 40, so that the two housing sections 36, 38 move away from one another, as is shown schematically in FIG. 3. In this way, the closure elements 26 are released, which were previously received in a form-fitting manner in the annular receiving space 46, so that the closure unit 14 can open to expose the opening 16 in the housing jacket 12.
  • the closure unit 14 is opened due to the greater pressure in the interior of the gas bag, so that the closure elements 26, which are then no longer held positively by the ignition unit 18, in particular the two housing sections 36, 38, can be pressed outwards.
  • This process is shown in more detail in FIGS. 4 to 7.
  • the electrical line 20 is not shown in FIGS. 4 to 7.
  • FIGS. 4 and 5 show the gas bag 10 with the closure unit 14 from the outside or inside in the closed state, that is to say the non-activated state. 6 and 7, on the other hand, the gas bag 10 with the closure unit 14 is shown in perspective in the open state from the outside, in which the ignition unit 18 has been activated, so that the opening 16 in the gas bag jacket 12 has been released, which for reasons of a better overview only partially is shown.
  • FIG. 4 shows how the outer holding position 30 positively fixes the ignition unit 18 to the closure element 26 from the outside of the closure unit 14, the ignition unit 18 extending from the outside to the gas bag interior, as can be seen in FIG. 5.
  • FIGS. 4 and 5 also illustrate that the closure elements 26 are each coupled to the base support 28 via their connecting section 31, in particular via a circular double seam 48.
  • the base support 28 is connected to the gas bag jacket 12, in particular via a seam 52, which is preferably formed concentrically to the double seam 48 and can also be designed as a double or triple seam 52.
  • the base support 28 can be connected to the gas bag jacket 12 and / or the closure elements by means of proximity 50, which run radially in particular with respect to the annular base support 28.
  • the closure unit 14, in particular the base carrier 28, is connected in particular to the outside or the inside of the gas bag jacket 12, in particular via the seams 50 and 52
  • the tightness and / or the stability of the closure unit in the gas bag jacket 14 can be increased.
  • the base carrier 28 bears against the inside of the gas bag jacket 12, whereas the closure elements 26 of the Outside of the gas bag jacket 12 are assigned.
  • the edge of the opening 16 of the gas bag casing 12 is accommodated between the overlapping sections 35 and the base support 28.
  • FIG. 4 also shows that the individual closure elements 26 are arranged in a scale-like manner in the circumferential direction of the closure unit 14, since they overlap each other as viewed in the circumferential direction. This means that a closure element 26 is at least partially overlapped in the circumferential direction by the respectively adjacent closure element 26.
  • closure element 26 to which the ignition unit 18, in particular the one housing section 38, is fastened, is not overlapped by another closure element 26 as seen from the outside of the closure unit 14.
  • This closure element 26 thus completely forms part of the outside of the closure unit 14, provided that there is no holding position 30, which has been applied to the outside of this closure element 26 in order to hold the housing section 38 in a form-fitting manner on the closure element 26.
  • FIGS. 6 and 7 show that the ignition unit 18 is at least partially, namely via its housing section 38, still attached to the corresponding closure element 26 even in the triggered state, since the housing section 38 is held in a form-fitting manner in the corresponding recess 34 of the closure element 26 , in particular due to the holding position 30.
  • a closure unit 14 results, the closure elements 26 of which are held together centrally by the ignition unit 18 in the closed state. This takes place via a corresponding positive connection, which the ignition unit 18 provides via its correspondingly shaped housing sections 36, 38.
  • the ignition unit 18, which serves as a release unit is arranged directly on the closure elements 26, so that tether straps, cords or similar transmission elements can be dispensed with in order to open the closure unit 14.
  • the flower-like or petal-shaped arrangement of the closure elements 26 therefore makes it possible to provide a fast-reacting, easy-to-produce and inexpensive closure unit 14, since the ignition unit 18 can be coupled directly to the closure elements 26, which are held together centrally by the ignition unit 18.

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

Abstract

L'invention concerne une unité de fermeture (14) destinée à un coussin gonflable (10) d'un dispositif de sécurité de véhicule automobile. L'unité de fermeture comprend une unité d'allumage électrique (18) et une pluralité d'éléments de fermeture (26) qui sont adaptés pour fermer une ouverture (16) ménagée dans une enveloppe (12) du coussin gonflable (10) dans un état non activé de l'unité d'allumage (18). L'unité d'allumage (18) est fixée à l'un des éléments de fermeture (26). L'invention concerne également un coussin gonflable (10).
PCT/EP2019/077736 2018-10-18 2019-10-14 Unité de fermeture pour coussin gonflable et coussin gonflable WO2020078881A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018125873.9 2018-10-18
DE102018125873.9A DE102018125873A1 (de) 2018-10-18 2018-10-18 Verschlusseinheit für einen Gassack sowie Gassack

Publications (1)

Publication Number Publication Date
WO2020078881A1 true WO2020078881A1 (fr) 2020-04-23

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ID=68461737

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/077736 WO2020078881A1 (fr) 2018-10-18 2019-10-14 Unité de fermeture pour coussin gonflable et coussin gonflable

Country Status (2)

Country Link
DE (1) DE102018125873A1 (fr)
WO (1) WO2020078881A1 (fr)

Cited By (1)

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US10974683B2 (en) * 2016-05-25 2021-04-13 Yanfeng Automotive Safety Systems Co., Ltd. Safety airbag

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US6517108B1 (en) * 2002-01-02 2003-02-11 Ford Global Technologies, Inc. Pyrotechnic air bag stitch vent
US20030214124A1 (en) * 2002-05-17 2003-11-20 Depottey Timothy Active venting apparatus and method for airbag systems
US20030214125A1 (en) * 2002-05-17 2003-11-20 Schneider David W. Active venting apparatus and method for airbag systems
DE202004015294U1 (de) * 2004-10-01 2005-02-17 Trw Automotive Safety Systems Gmbh Gassackmodul
EP1683685A2 (fr) * 2005-01-19 2006-07-26 TRW Automotive Safety Systems GmbH Sac gonflable pour un dispositif de retenue pour occupant de véhicule
DE202005005797U1 (de) * 2005-04-12 2005-07-21 Trw Automotive Safety Systems Gmbh Gassackmodul mit Abströmeinrichtung
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EP2671763A1 (fr) * 2012-06-08 2013-12-11 Autoliv Development AB Panneaux de remplissage pour les peaux de réservoirs de carburant d'aéronefs
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Publication number Priority date Publication date Assignee Title
US10974683B2 (en) * 2016-05-25 2021-04-13 Yanfeng Automotive Safety Systems Co., Ltd. Safety airbag

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