WO1997020712A1 - Systeme pour remplir un dispositif de retenue - Google Patents

Systeme pour remplir un dispositif de retenue Download PDF

Info

Publication number
WO1997020712A1
WO1997020712A1 PCT/EP1996/005431 EP9605431W WO9720712A1 WO 1997020712 A1 WO1997020712 A1 WO 1997020712A1 EP 9605431 W EP9605431 W EP 9605431W WO 9720712 A1 WO9720712 A1 WO 9720712A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
membrane
module
combustion chamber
pressure vessel
Prior art date
Application number
PCT/EP1996/005431
Other languages
German (de)
English (en)
Inventor
Hermann Bauer
Richard Bender
Uwe Dölling
Thomas Kistler
Siegfried Zeuner
Original Assignee
Trw Airbag Systems Gmbh & Co. Kg
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 Airbag Systems Gmbh & Co. Kg filed Critical Trw Airbag Systems Gmbh & Co. Kg
Publication of WO1997020712A1 publication Critical patent/WO1997020712A1/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
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/268—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous release of stored pressurised gas
    • B60R21/272—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous release of stored pressurised gas with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators

Definitions

  • the invention relates to a device for filling a restraining device, in particular an impact cushion (airbag) for protection for the occupants of a motor vehicle, according to the preamble of claim 1
  • Hyb ⁇ d-Casgenerator is known for example from the patent DE 44 05 997 ci
  • the hybrid gas generator described therein has the disadvantages that, on the one hand, only insufficient mixing takes place between the cold gas stored in the high-pressure container and the pyrotechnically generated hot gas in the mixing chamber, so that due to the only slightly cooled hot gas, a strong thermal Loading of parts of the gas generator and the impact cushion takes place. On the one hand, this results in an increased risk of injury for vehicle occupants and, on the other hand, there are larger, thicker walls of the affected parts and thus additional material and weight required
  • the gas generator has an unreproducible opening behavior of the membrane, so that the point in time at which cold gas emerges from the high-pressure container is associated with a large uncertainty factor.
  • the fuel is dimensioned so that only the membrane is welded on and there is insufficient heating of the propellant gas at a low ambient temperature.
  • a device for filling a restraint device in particular an impact cushion (airbag) for protecting the occupants of a motor vehicle, with the following features.
  • a gas mixture consisting of a cold gas and a hot gas is used to fill the impact cushion;
  • the cold gas is stored in a pressure vessel;
  • the pressure vessel has an outlet opening which is closed with a membrane, the hot gas is generated pyrotechnically in a module, the module has a combustion chamber with outlet openings which are directed towards the membrane, the outlet openings are directed towards the membrane;
  • the pyrotechnically generated hot gas first welds through the membrane and then heats the emerging cold gas, the pressure vessel being arranged in a toroidal shape around the module
  • the hybrid gas generator has a modular structure, so that the individual modules can be prefabricated, tested and easily and inexpensively connected to one another during final assembly.
  • tige very pure and tempered propellant gas, so that no complex and expensive filter media for cleaning and cooling of the propellant gas generated must be used
  • the figure shows a hybrid gas generator 1, the circular and mostly made of aluminum, an aluminum alloy or sheet steel
  • IO home is composed of an upper housing part 2 and a lower housing part 3 for fastening an impact cushion 4 as part of an occupant protection system and for fastening the hybrid gas generator 1 to structural elements of a motor vehicle, for example the steering wheel, which is used with the housing lower part 3 one-piece flange 5 in the center is in one
  • igniter 6 arranged an ignition unit 11 consisting of electrical igniter 7, primary charge 8, intensifying charge 9 and early charge 10
  • a toroidal combustion chamber 0 12 is arranged concentrically around the igniter unit 11 and contains a solid fuel 13, which is usually in tablet form.
  • Volume compensation means in the form of full bodies 14 ensure a secure hold of the fuel tablets 13 and prevent noise caused by rattling during driving operation In a draw, hot gas jets flow from the ignition unit 11 through nozzle holes 5 into the combustion chamber 12 and ignite the fuel tablets there
  • the propellant gas which arises when the fuel tablets 13 burn off leaves the combustion chamber 12 through discharge openings in the form of nozzles 16 and flows into a mixing zone 17 em in order to protect the mostly moisture-sensitive fuel tablets 13 from the ingress of moisture, the 0 nozzles 16 by means of a dam 18 sealed in the form of a dense film, for example an aluminum film
  • a pressure vessel 19 with filling device 20 for storing an inert gas, a gas mixture or a liquid gas is arranged around the combustion chamber 12 and between the upper housing part 2 and the lower housing part 3, the outlet opening 26 of which is closed by a membrane 21
  • the membrane 21 is towards the mixing zone 17 and opposite the du- sen 16 of the combustion chamber 12 arranged such that it is welded when the hybrid gas generator 1 is triggered by the hot gas jets formed when the fuel tablets 13 are burnt off.
  • the opening behavior when welding through can be achieved by suitable curvature or 5 notching of the membrane 21 and by the distance between the membrane
  • the diameter of the nozzles 16 must be dimensioned according to how much hot gas has to flow through them in order to achieve a burning through of the membrane 21 in the shortest tent, so that cold gas can escape from the pressure vessel 19.
  • the pyrotechnically generated hot gas also has the task of heating the cold gas flowing out of the pressure vessel 19 in the mixing zone 17 so that its volume increases and the impact cushion 4 is inflated 15 to a sufficient extent.
  • the mixing creates a well-tempered gas mixture, so that a high thermal load on the hybrid gas generator 1 and the baffle cushion 4 due to insufficiently mixed hot gas is avoided.
  • the cold gas emerging from the pressure vessel 19 mixes with the hot gas generated in the combustion chamber 12 to form a gas mixture with a defined temperature.
  • the modular structure results in a simple and inexpensive construction of the hybrid gas generator 1 housing lower part 3 with the pressure vessel 19 and the approximately rotationally symmetrical housing upper part 2 with the ignition unit 11 and the combustion chamber 12, designed as an insert and designated as a pyrotechnic module 27 preassembled and checked before all modules are connected to each other during final assembly. Since the upper housing part 2 and the lower housing part 3 must be permanently and inseparably connected to one another, a form-locking connection in the form of a thread 24, which is at least partially self-tapping, is used as the connecting means
  • the fuel tablets 13 are filled into the combustion chamber 12 and these are sealed with a seal 25. Finally, the upper housing part 2 is screwed into the lower housing part 3

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne un système pour remplir un dispositif de retenue, notamment un airbag (4) destiné à protéger les passagers d'un véhicule automobile, ce système présentant les caractéristiques suivantes: un mélange de gaz comprenant un gaz froid et un gaz chaud est utilisé pour remplir l'airbag (4); le gaz froid est stocké dans un récipient pressurisé (19); ce dernier comporte une ouverture d'admission (26) fermée par une membrane (21); le gaz chaud est produit par voie pyrotechnique dans un module (27); ce dernier comprend une chambre de combustion (12) pourvue d'ouvertures de sortie (16) dirigées vers la membrane (21); lorsque le système se déclenche, le gaz chaud produit par voie pyrotechnique fait d'abord fondre la membrane (21) puis chauffe le gaz froid sortant; et le récipient pressurisé (19) est disposé de manière toroïdale autour du module (27).
PCT/EP1996/005431 1995-12-06 1996-12-05 Systeme pour remplir un dispositif de retenue WO1997020712A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995145494 DE19545494A1 (de) 1995-12-06 1995-12-06 Vorrichtung zum Befüllen einer Rückhaltevorrichtung
DE19545494.4 1995-12-06

Publications (1)

Publication Number Publication Date
WO1997020712A1 true WO1997020712A1 (fr) 1997-06-12

Family

ID=7779337

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/005431 WO1997020712A1 (fr) 1995-12-06 1996-12-05 Systeme pour remplir un dispositif de retenue

Country Status (2)

Country Link
DE (1) DE19545494A1 (fr)
WO (1) WO1997020712A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5851027A (en) * 1996-09-09 1998-12-22 Bendix-Atlantic Inflator Company Variable output driver side hybrid inflator
DE19726276A1 (de) * 1997-06-20 1998-12-24 Temic Bayern Chem Airbag Gmbh Gasgenerator mit einer Vorrichtung zur Erzeugung eines Fluidfilms
DE20114664U1 (de) 2001-09-05 2002-01-17 Trw Airbag Sys Gmbh & Co Kg Hybrid-Gasgenerator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2243843A1 (en) * 1973-09-14 1975-04-11 Eaton Corp Hybrid gas generator for steering wheel mounted airbag - has flat cylindrical housing with central pyrolytic charge and mixing chamber for purifying system
DE4405997C1 (de) * 1994-02-24 1995-03-30 Temic Bayern Chem Airbag Gmbh Hybrid-Gasgenerator zum Füllen eines Gassacks

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450414A (en) * 1965-11-06 1969-06-17 Gic Kk Safety device for vehicle passengers
US3567245A (en) * 1968-05-17 1971-03-02 Eaton Yale & Towne Vehicle safety apparatus
US3901530A (en) * 1973-08-08 1975-08-26 Allied Chem Multiple mini hybrid with direct bag connection
US5199740A (en) * 1991-06-10 1993-04-06 Bendix Atlantic Inflator Co. Hybrid inflator for air bag
DE4135299C2 (de) * 1991-10-25 1998-12-24 Temic Bayern Chem Airbag Gmbh Gasgenerator
DE4208844C2 (de) * 1992-03-19 1999-12-02 Trw Airbag Sys Gmbh & Co Kg Gasgenerator-System
DE4312646C2 (de) * 1993-04-19 1997-06-05 Hs Tech & Design Vorrichtung zum Befüllen eines Airbags
US5423570A (en) * 1994-05-09 1995-06-13 Morton International, Inc. Hybrid inflator with tortuous delivery passage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2243843A1 (en) * 1973-09-14 1975-04-11 Eaton Corp Hybrid gas generator for steering wheel mounted airbag - has flat cylindrical housing with central pyrolytic charge and mixing chamber for purifying system
DE4405997C1 (de) * 1994-02-24 1995-03-30 Temic Bayern Chem Airbag Gmbh Hybrid-Gasgenerator zum Füllen eines Gassacks

Also Published As

Publication number Publication date
DE19545494A1 (de) 1997-06-12

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