EP0833763A1 - Generateur de gaz pour systemes d'airbag equipes d'un depoussiereur a force centrifuge - Google Patents

Generateur de gaz pour systemes d'airbag equipes d'un depoussiereur a force centrifuge

Info

Publication number
EP0833763A1
EP0833763A1 EP96920828A EP96920828A EP0833763A1 EP 0833763 A1 EP0833763 A1 EP 0833763A1 EP 96920828 A EP96920828 A EP 96920828A EP 96920828 A EP96920828 A EP 96920828A EP 0833763 A1 EP0833763 A1 EP 0833763A1
Authority
EP
European Patent Office
Prior art keywords
gas
gas generator
chamber
generator according
swirl chamber
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP96920828A
Other languages
German (de)
English (en)
Inventor
Uwe Brede
Anton Bretfeld
Harald Frank
Josef Kraft
Gerrit Scheiderer
Franz Durst
Dimosthenis Trimis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dynamit Nobel AG
Dynamit Nobel GmbH Explosivstoff und Systemtechnik
Original Assignee
Dynamit Nobel AG
Dynamit Nobel GmbH Explosivstoff und Systemtechnik
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
Priority claimed from DE19600843A external-priority patent/DE19600843A1/de
Application filed by Dynamit Nobel AG, Dynamit Nobel GmbH Explosivstoff und Systemtechnik filed Critical Dynamit Nobel AG
Publication of EP0833763A1 publication Critical patent/EP0833763A1/fr
Withdrawn legal-status Critical Current

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
    • B60R21/264—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 generation of gas, e.g. pyrotechnic
    • B60R21/2644—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 generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder

Definitions

  • the invention relates to a gas generator, in particular for inflating a gas bag (airbag) which serves to protect vehicle occupants, according to the preamble of claim 1.
  • a gas generator in particular for inflating a gas bag (airbag) which serves to protect vehicle occupants, according to the preamble of claim 1.
  • a gas generator of the generic type for inflating a gas bag (airbag system) serving to protect vehicle occupants is known from US Pat. No. 4,084,839, in which an ignition element and a gas-generating material are arranged in a housing. When the gas-generating material is ignited by the ignition element, the generated gas and particle stream enters a swirl chamber in which dust is separated by centrifugal force. The cleaned gas flow enters the gas bag via a dip tube immersed centrally in the swirl chamber.
  • a disadvantage of this gas generator is the incomplete cleaning of the gas and particle stream.
  • the invention has for its object to improve a gas generator according to the preamble of claim 1 with a view to optimal cleaning of the gas and particle stream.
  • the gas generator should have a simple construction with a smaller construction volume.
  • a preferred embodiment of the invention is characterized in that the loading container, the ignition element, the swirl chamber, the immersion tube and the outflow came on a common axis of symmetry and are arranged
  • the swirl chamber, the immersion tube and the outflow chamber form a component to which the loading container is coupled to the ignition element via a connecting element.
  • This embodiment achieves optimal cleaning of the gas and particle stream with a small construction volume and a simple construction.
  • the coupling is advantageously carried out via a clamping ring.
  • This has the advantage that pre-assembled gas generators can be opened cheaply by opening the clamping ring. This is necessary if e.g. the pyrotechnic assemblies such as the ignition element or loading container are to be replaced.
  • the connecting element has a bore, which is connected on the one hand to a predetermined breaking point of the loading container and on the other hand to a distribution space adjacent to the connecting element, the distribution space having openings in the direction of the swirl chamber.
  • a wire mesh molded part arranged in the way of the gas flow is provided in the loading container or in the distribution space.
  • the openings of the distribution space are connected to an annular space coaxially surrounding the swirl chamber, the peripheral wall of the swirl chamber being slit at one or more points over all or part of the width and being bent inward, so that the gas flow is inevitable a tangential inflow into the swirl chamber results.
  • the slotted ends of the swirl chamber expediently overlap.
  • An alternative embodiment is characterized in that the distribution space is connected directly to the swirl chamber via two openings, the swirl chamber consisting of two coiled spiral channels and each opening being connected to a channel.
  • This spiral-shaped guidance of the gas and particle flow increases the angular velocity towards the center while maintaining the flow velocity, thereby making it possible to separate particles of low mass from the gas channel walls.
  • the gas flow is directed through the dip tube into the outflow chamber.
  • the immersion tube can also be designed as a screw (like a cooling coil).
  • cooling elements such as, for example, are advantageously in front of the openings to the annular space and / or in the annular space and / or in the outflow chamber.
  • Wire mesh arranged.
  • the walls of the swirl chamber or of the spiral channels have a roughened surface or pockets. This can be achieved by attaching grids or perforated sheets. As a result, the separation of the particles from the main flow is additionally promoted, especially at low flow speeds, since the particles separate out in the roughened surface or in the pockets, grids or perforated sheets.
  • An alternative embodiment according to the invention is characterized in that the swirl chamber, the outflow chamber and the immersion tube are arranged in a continuous tube and that in the tube at least one tangential bore leads into the swirl chamber, which is connected to a pressure element.
  • the gas-generating material is accommodated in the pressure element.
  • This embodiment is particularly inexpensive to manufacture and has an extremely small construction volume.
  • the pressure element is advantageously integrated in a fastening part flanged to the tube.
  • the pressure element can also be easily replaced in this embodiment.
  • a special embodiment is characterized in that the tube contains two gas generators constructed in mirror image.
  • the ignition element is advantageously integrated in the loading container or the pressure element.
  • Fig. 4 is a spiral dip tube.
  • FIG. 1 a, b show in two sections a gas generator according to the invention which consists of two modules or components.
  • An ignition element 1 and a gas-generating charge 4 in the form of gas pack tablets or pellets are arranged in a first module, the charging container 3.
  • the loading container 3 consists of a cylindrical housing 36, the front end of which is curved.
  • the ignition element 1 is inserted into this arch so that the exit point of the ignition flame of the ignition element 1 is opposite a predetermined breaking point 2 in the arch of the cylindrical housing 36 of the charging container 3.
  • the latter is closed with a loading container cover 5.
  • a wire mesh molded part 8 is arranged like a lid.
  • the gas-generating charge 4 is located between the wire mesh molded part 8 and the ignition element 1. So that the gas-generating charge 4 is fixed, there is a volume compensation 37 made of, for example, a wire mesh between the Wire mesh molding 8 and the gas-generating charge 4 are provided.
  • the loading container 3 is inserted into a cylindrical jacket 38, on the front side of which only the connection socket 39 of the ignition element 1 protrudes. The casing 38 and thus the loading container 3 are fastened to a connecting element 7 via a clamping ring 28.
  • a through hole 6 is made in the center of the connecting element 7.
  • the loading container cover 5 is provided with a predetermined breaking point 29 at this point.
  • connection socket 39 When the electrical ignition element 1 is activated via the connection socket 39, an ignition flame is generated in the ignition element 1, which breaks through the predetermined breaking point 2 of the cylindrical housing 36 of the charging container 3 and which ignites the gas-generating charge 4.
  • the generated gas and particle flow flows through the wire mesh molded part 8 and breaks through the predetermined breaking point 29 in the loading container cover 5 and passes through the bore 6 in the connecting element 7 into a distribution space 30, which will be described later.
  • the wire mesh molded part 8 is inserted in the loading container 3.
  • the mesh size of the wire mesh is much smaller than the size of the gas pack tablets.
  • the lid-like configuration of the wire mesh molding 8 provides the hot gas and particle stream with a much larger wire mesh area than would be the case if the wire mesh molding 8 were in direct contact with the bore 6. This prevents erosion of the wire mesh.
  • a swirl chamber 25 and an immersion tube 18 projecting into it are arranged, via which the cleaned gas flow enters an outflow chamber 27 and from there into the gas bag, not shown.
  • the charging container 3, the ignition element 1, the swirl chamber 25, the immersion tube 18 and the outflow chamber 27 lie on a common axis of symmetry 26.
  • this second component or module also consists of a cylindrical jacket 40 which has the same external dimensions and which together with the cylindrical jacket 38 of the first component via the clamping ring 28 is attached to the connecting element 7.
  • the clamping ring 28 is fastened by means of a fold.
  • a bell-shaped baffle 10 is arranged in front of the bore 6, so that a distribution space 30 is created.
  • openings 12 are provided which open into an annular space 13 which surrounds the swirl chamber 25.
  • cooling elements 11, 14 such as Wire mesh arranged.
  • the peripheral wall 16 of the swirl chamber 25 is slit here at one point over the entire width of the swirl chamber 25 and bent inwards so that an inlet slot 15 results, the two ends overlapping. This inevitably results in a tangential inflow into the swirl chamber 25 for the gas flow.
  • the front ends of the swirl chamber form the baffle plate 10 and a stiffening element 9.
  • the stiffening element 9 is penetrated in the center by an immersion tube 18, which protrudes at one end into the swirl chamber 25 and at the other end into the outflow chamber 27. Via openings 19 distributed around the circumference of the immersion tube 18, the gas flow reaches the outflow chamber 27 and from there via openings 22 in the cylindrical jacket 40 into the gas bag (not shown).
  • the gas generator according to the invention is constructed in a modular design from deep-drawn sheet metal parts and simple turned, embossed or forged parts.
  • FIGS. 1a, b show an alternative embodiment of the gas generator according to the invention.
  • An alternative is that the wire mesh molding 8 is integrated into the distribution space 30 instead of in the loading container 3. This embodiment can of course also be used for the embodiment in FIGS. 1a, b.
  • the vortex chamber is designed as a spiral vortex in FIGS. 2a, b.
  • the swirl chamber is designed as a casting.
  • the openings 12 are each connected to an elongated hole 31a, 31b (see FIG. 2b).
  • Each of these elongated holes 31a, 31b is connected to a spiral channel 32a, 32b, these channels 32a, 32b being wound up in a spiral.
  • Particles of low mass are also separated through these spiral channels, since the angular velocity to the center i.e. to the dip tube 18 is increased. As a result, the particles separate on the outer gas channel walls.
  • the immersion tube 18 extends far into the swirl chamber 25 and fills the axial length of the swirl chamber to approximately 80%.
  • the embodiment according to FIGS. 2a, 2b is identical to that of FIGS. 1a, 1b, so that the same reference numerals also designate the same object.
  • 3a-c show an embodiment in which the swirl chamber 25, the outflow came 27 and the immersion tube 18 are arranged in a continuous tube 33.
  • at least one tangential bore 34 is arranged in the tube 33, which is connected to a pressure element 43.
  • the pressure element 43 is integrated in a fastening part 35 flanged to the tube 33.
  • the gas-generating material, cooling elements and the ignition element are accommodated in the pressure element 43, so that the pressure element 43 forms a "smaller" gas generator.
  • the fastening part 35 consists of two parts which are connected to one another via screws 20.
  • the pipe 33 is guided between the two parts of the fastening part.
  • the gas and particle flow is cleaned according to the "normal vortex" principle, ie as shown in FIGS. 1a, b.
  • the dip tube 18 is in one Partition 23 let in, which is connected by screws 24 to the tube 33.
  • the tube 33 is closed gas-tight by plugs 41 which are screwed into the tube 33 with a seal 42.
  • the tube 33 contains two gas generators constructed in mirror image. This embodiment is particularly suitable for side airbag systems in motor vehicles.
  • FIG. 4 shows a special embodiment of the immersion tube 18.
  • the immersion tube 18 is of helical design (like a cooling coil).

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Air Bags (AREA)

Abstract

Le générateur de gaz décrit, qui sert notamment pour gonfler un coussin de gaz de protection des passagers d'un véhicule, comprend un conteneur de charge (3) qui contient un matériau gazogène (4), un élément électrique d'allumage (1) qui allume le matériau gazogène (4), une chambre de turbulence (25) qui sert de dépoussiéreur à force centrifuge et un tube plongeur (18) monté sur l'axe de symétrie (24) de la chambre de turbulence (25) et qui fait saillie dans celle-ci. Le courant épuré de gaz parvient à une chambre d'écoulement (27) dans le coussin de gaz à travers ce tube plongeur (18). Afin d'améliorer l'effet d'épuration avec un dispositif compact et simple, le conteneur de charge (3), l'élément d'allumage (1), la chambre de turbulence (25), le tube plongeur (18) et la chambre d'écoulement (27) se situent sur un axe commun de symétrie (26) et la chambre de turbulence (25), le tube plongeur (18) et la chambre d'écoulement (27) forment un module couplé par un élément de liaison (7) au conteneur de charge (3) et à l'élément d'allumage (1).
EP96920828A 1995-06-22 1996-06-19 Generateur de gaz pour systemes d'airbag equipes d'un depoussiereur a force centrifuge Withdrawn EP0833763A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19522705 1995-06-22
DE19522705 1995-06-22
DE19600843 1996-01-12
DE19600843A DE19600843A1 (de) 1995-06-22 1996-01-12 Gasgenerator für Airbag-Systeme mit einem Fliehkraft-Staubabscheider
PCT/EP1996/002644 WO1997000794A1 (fr) 1995-06-22 1996-06-19 Generateur de gaz pour systemes d'airbag equipes d'un depoussiereur a force centrifuge

Publications (1)

Publication Number Publication Date
EP0833763A1 true EP0833763A1 (fr) 1998-04-08

Family

ID=26016195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96920828A Withdrawn EP0833763A1 (fr) 1995-06-22 1996-06-19 Generateur de gaz pour systemes d'airbag equipes d'un depoussiereur a force centrifuge

Country Status (8)

Country Link
EP (1) EP0833763A1 (fr)
JP (1) JPH11507891A (fr)
BR (1) BR9608622A (fr)
CA (1) CA2221652A1 (fr)
CZ (1) CZ413597A3 (fr)
PL (1) PL324241A1 (fr)
TR (1) TR199701655T1 (fr)
WO (1) WO1997000794A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10202096B2 (en) * 2016-12-13 2019-02-12 Autoliv Asp, Inc. Thrust vector tuning of inflator devices

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3618980A (en) * 1969-10-31 1971-11-09 Chrysler Corp Trap for nongaseous matter
DE2364268C3 (de) * 1973-12-22 1980-07-03 Rudolf 8025 Unterhaching Reiter Feststoffgasgenerator, inbesondere zum Aufblasen eines dem Schütze von Fahrzeuginsassen dienenden Gassacks
JPS5211533A (en) * 1975-07-14 1977-01-28 Nippon Soken Inc Gas bag device
DE9013129U1 (de) * 1990-09-15 1990-11-29 Temic Bayern-Chemie Airbag Gmbh, 84544 Aschau Gasgenerator
DE9013128U1 (de) * 1990-09-15 1990-11-22 Bayern-Chemie Gesellschaft für flugchemische Antriebe mbH, 8261 Aschau Gasgenerator
DE4121039C2 (de) * 1991-06-26 1995-08-17 Rudolf Reiter Gasgenerator als Teil einer Aufprallschutzeinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9700794A1 *

Also Published As

Publication number Publication date
JPH11507891A (ja) 1999-07-13
TR199701655T1 (xx) 1998-05-21
CZ413597A3 (cs) 1998-09-16
WO1997000794A1 (fr) 1997-01-09
BR9608622A (pt) 1999-05-04
MX9710050A (es) 1998-03-29
PL324241A1 (en) 1998-05-11
CA2221652A1 (fr) 1997-01-09

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