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DE3921472C1 - Device for gas generator - in which gas for inflating cushion for protecting travellers in vehicle crash can take two routes to gas outlet - Google Patents

Device for gas generator - in which gas for inflating cushion for protecting travellers in vehicle crash can take two routes to gas outlet

Info

Publication number
DE3921472C1
DE3921472C1 DE19893921472 DE3921472A DE3921472C1 DE 3921472 C1 DE3921472 C1 DE 3921472C1 DE 19893921472 DE19893921472 DE 19893921472 DE 3921472 A DE3921472 A DE 3921472A DE 3921472 C1 DE3921472 C1 DE 3921472C1
Authority
DE
Germany
Prior art keywords
gas
opening
gas stream
cover
routes
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.)
Expired - Fee Related
Application number
DE19893921472
Other languages
German (de)
Inventor
Karl-Heinz 8035 Stockdorf De Sommer
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.)
Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
Original Assignee
Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
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 Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH filed Critical Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
Priority to DE19893921472 priority Critical patent/DE3921472C1/en
Priority to US07/526,704 priority patent/US5054811A/en
Priority to JP2163013A priority patent/JPH0365453A/en
Application granted granted Critical
Publication of DE3921472C1 publication Critical patent/DE3921472C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J7/00—Apparatus for generating gases
    • 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
    • B60R2021/26094—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 characterised by fluid flow controlling valves

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Air Bags (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

After passing through a sieve at the gas generator mouth, gas for inflating a protective cushion for travellers in a crushed vehicle can take two possible routes towards the gas discharge outlet, via central and lateral holes in an angled partition. The balance between the two routes is determined by a mobile cover element of material and dimensions such that with ambient temp. above a pre-set threshold level, one of the holes is closed, increasing the amt. of propellant gas discharged into the atmos. ADVANTAGE - Effective inflation is achieved without any pressure redn. caused by low atmos. temp.

Description

Die Erfindung betrifft eine Vorrichtung für einen Gasgenerator einer Kraftfahrzeuginsassen-Schutzvorrichtung, der eine an die Treibstoffkam­ mer anschließende und mit dieser durch Öffnungen verbun­ dene Filterkammer mit Filtern für den austretenden Gasstrom aufweist.The invention relates to a device for a gas generator Motor vehicle occupant protection device that came to the fuel subsequent and connected to it through openings has filter chamber with filters for the escaping gas flow.

Gasgeneratoren für Luftkissen sind in der Kraftfahrzeugtechnik in viel­ fältigen Ausführungen bekannt. Die DE-PS 31 47 780 beschreibt den Gasgenerator einer Aufprallschutzvorrichtung, bei dem eine ventilartige Vorrichtung vorge­ sehen ist, um bei temperaturbedingtem Anstieg der erzeugten Gasmenge und des dadurch bedingten Gasdruckes einen Teil des Gases über eine Öffnung in die Atmosphäre abzulassen.Gas generators for air cushions are many in automotive engineering well-known versions. DE-PS 31 47 780 describes the gas generator one Impact protection device in which a valve-like device is featured is to see with temperature-related increase in the amount of gas generated and the gas pressure caused thereby a part of the gas through an opening release into the atmosphere.

Weiterhin schlagen Druckschriften, wie die DE-OS 37 33 436 oder die US-PS 43 80 346 als Entlastungsmaßnahme vor, mit Folie verschlossene Öffnungen vorzusehen, die bei Überschreitung eines vorbestimmten Druckes aufreißen, so daß das überschüssige Gas nach außen entweichen kann.Furthermore, publications such as DE-OS 37 33 436 or US-PS 43 80 346 as a relief measure, sealed with foil Provide openings that exceed a predetermined pressure tear open so that the excess gas can escape to the outside.

In allen Fällen werden aber die Kraftfahrzeuginsassen oder die Umgebung mit dem austretenden Gas belastet.In all cases, however, the motor vehicle occupants or the environment loaded with the escaping gas.

Der Erfindung liegt die Aufgabe zugrunde, einen Gasgenerator mit Filter­ kammer so auszubilden, daß die Temperaturabhängigkeit der Gaserzeugung einen erheblich reduzierten Einfluß auf das rechtzeitige und funktions­ sichere Aufblasen des Luftkissens ausübt.The invention has for its object a gas generator with a filter chamber so that the temperature dependence of gas generation a significantly reduced impact on timely and functional inflates the air cushion safely.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Patentanspruches 1 wiedergegebenen Merkmale gelöst. Vorteilhafte Ausgestal­ tungen ergeben sich aus den Unteransprüchen.This object is achieved by the in the characterizing part of Claim 1 reproduced features solved. Advantageous design cations result from the subclaims.

Die besonderen Vorteile der Erfindung liegen zum einen darin, daß gerade bei niedrigen Umgebungstemperaturen eine höhere Betriebssicherheit er­ reicht wird. Zum anderen kann auch die Treibstoffmenge reduziert werden, so daß bei hohen Umgebungstemperaturen ein niedrigerer Spitzendruck er­ reicht wird und sich dadurch die Betriebssicherheit aufgrund der gerin­ geren Druckbelastung des Gehäuses und des Luftkissens erhöht.The particular advantages of the invention lie in the fact that higher operating safety at low ambient temperatures is enough. On the other hand, the amount of fuel can also be reduced,  so that at high ambient temperatures he has a lower peak pressure is enough and thereby operational safety due to the gerin low pressure load on the housing and the air cushion.

Gleichzeitig wird aufgrund der geringeren Treibstoffmenge auch das Ei­ gengewicht des Gasgenerators reduziert und die beim Abstand erzeugte Schadstoffmenge verringert.At the same time, due to the lower amount of fuel, the egg also counterweight of the gas generator is reduced and the distance generated Reduced amount of pollutants.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and is described in more detail below.

Die einzige Figur der Zeichnung zeigt einen schematisch vereinfachten Schnitt durch einen Gasgenerator einer Aufprallschutzvorrichtung.The only figure of the drawing shows a schematically simplified Section through a gas generator of an impact protection device.

Mit dem Treibstoffgehäuse 3, das den Treibstoff 4 zur Gaserzeugung enthält, ist das Gehäuse 2 der Filterkammer F verbunden. Für den Gasstrom aus der Treibstoffkammer T in Die Filterkammer F ist eine mit einem Sieb 13 abgedeckte Öffnung 5 vor­ gesehen. Die Filterkammer F weist eine Trennwand 6 auf, die diese in zwei gegeneinander abgeschottete Räume 14 und 15 unterteilt, von denen ei­ ner 14 über die Öffnung 5 mit der Treibstoffkammer T verbunden ist und der andere 15 der mit einem Filterpaket 16 abgedeckten Ausblasöffnung 12 zugeordnet ist.The housing 2 of the filter chamber F is connected to the fuel housing 3 , which contains the fuel 4 for generating gas. For the gas flow from the fuel chamber T in the filter chamber F , an opening 5 covered with a sieve 13 is seen before. The filter chamber F has a partition wall 6 which divides them against each other insular into two spaces 14 and 15 ner of which 14 is connected via the opening 5 with the fuel chamber T ei and the other 15 of the covered with a filter package 16 blow-out opening 12 is associated .

Die Trennwand 6 weist wenigstens eine erste Öffnung 7 und wenigstens ei­ ne zweite Öffnung 8 auf. Die zweite Öffnung 8 ist vollständig durch ein weiteres Filterpaket 9 abgedeckt und dient als Hauptweg 10 für den Gas­ strom wie er aus dem Stand der Technik geläufig ist.The partition 6 has at least one first opening 7 and at least one second opening 8 . The second opening 8 is completely covered by a further filter package 9 and serves as the main path 10 for the gas flow as is known from the prior art.

Die erste Öffnung 7 ermöglicht dem Gasstrom unter Umgehung des weiteren Filterpaketes 9 einen erheblich widerstandsärmeren Nebenweg 11 zur Aus­ blasöffnung 12.The first opening 7 enables the gas flow, bypassing the further filter package 9, a considerably lower resistance side path 11 to the blow opening 12 .

Auf der der Treibstoffkammer zugewandten Seite der Trennwand 6 ist die erste Öffnung 7 von einer beweglichen Abdeckung 1 überdeckt, die im Aus­ führungsbeispiel aus einem dünnen Aluminiumblech geformt ist. Entschei­ dend bei der Dimensionierung der Abdeckung ist die Maßgabe, daß die Ab­ deckung oberhalb einer bestimmten Schwelle des von der Umgebungstempera­ tur abhängigen Gasdruckes, beispielsweise bei der Raumtemperatur (etwa 20°C), so beweglich ist, daß sie von dem vom Treibstoff entwickelten Gasdruck auf die erste Öffnung 7 gedrückt wird und diese verschließt. Bei Temperaturen unter der genannten Schwelle reichen der bei niedrigen Temperaturen geringere Gasdruck und die reduzierte Beweglichkeit der Ab­ deckung nicht mehr aus, die erste Öffnung zu verschließen.On the side facing the fuel chamber of the partition 6 , the first opening 7 is covered by a movable cover 1 , which is formed in the exemplary embodiment from a thin aluminum sheet. Decisive in the dimensioning of the cover is the requirement that the cover from a certain threshold of the gas temperature dependent on the ambient temperature, for example at room temperature (about 20 ° C), is so mobile that it is from the gas pressure developed by the fuel is pressed onto the first opening 7 and closes it. At temperatures below the threshold mentioned, the lower gas pressure at low temperatures and the reduced mobility of the cover are no longer sufficient to close the first opening.

Mit dieser temperaturabhängigen Ventilfunktion der ersten Öffnung 7 wird folgendes erreicht. Bei niedrigen Temperaturen des Betriebsbereiches des Gasgenerator, d. h. im Bereich von -40°C bis etwa +20°C ist der Gasdruck niedrig bzw. die pro Zeiteinheit erzeugte Gasmenge gering. Infolgedessen soll vermieden werden, daß die austretende Gasmenge durch den Filter- und Kühlungsvorgang beim Durchströmen der Filter 9 noch weiter reduziert wird, wodurch die Funktionssicherheit der Aufprallschutzvorrichtung in Frage gestellt wäre. Deshalb wird ein wesentlicher Teil des Gasstromes auf dem Nebenweg 11 über die bei niedrigen Temperaturen offene erste Öffnung 7 in den Raum 15 geführt und dann durch das weitere Filterpaket 16 zur Ausblasöffnung 12 geleitet. Somit ist ein unverzögertes Aufblasen des Luftkissens gewähr­ leistet. Im Falle höherer Umgebungstemperaturen, d. h. im Bereich zwi­ schen +20°C und +85°C, ist die erste Öffnung durch die erfindungsgemäße Abdeckung 1 verschlossen und der gesamte Gasstrom verläuft auf dem an sich be­ kannten Hauptweg 10 durch beide Filterpakete 9 und 16 zur Ausblasöffnung 12. Somit wird mit Hilfe der Abdeckung 1 und deren Materialeigenschaften und Dimensionierung eine zuverlässige Umschaltung der Gasstromwege bei einer bestimmten Temperaturschwelle erreicht.The following is achieved with this temperature-dependent valve function of the first opening 7 . At low temperatures of the operating range of the gas generator, ie in the range from -40 ° C to about + 20 ° C, the gas pressure is low or the amount of gas generated per unit of time is low. As a result, it should be avoided that the amount of gas escaping is further reduced by the filtering and cooling process when the filter 9 flows through, which would jeopardize the functional safety of the impact protection device. Therefore, a substantial part of the gas flow on the secondary path 11 is led into the space 15 via the first opening 7 , which is open at low temperatures, and then passed through the further filter package 16 to the blow-out opening 12 . This guarantees an instantaneous inflation of the air cushion. In the case of higher ambient temperatures, ie in the range between + 20 ° C and + 85 ° C, the first opening is closed by the cover 1 according to the invention and the entire gas flow runs on the main path 10 , which is known per se, through both filter packs 9 and 16 Blow-out opening 12 . Thus, with the help of the cover 1 and its material properties and dimensions, a reliable switching of the gas flow paths at a certain temperature threshold is achieved.

Claims (3)

1. Vorrichtung für einen Gasgenerator einer Kraftfahrzeuginsassen- Schutzvorrichtung, der eine an die Treibstoffkammer an­ schließende und mit dieser durch Öffnungen verbundene Filterkammer mit Filtern für den austretenden Gasstrom aufweist, gekennzeichnet durch folgende Merkmale:
  • a) in der Filterkammer (F) ist eine durch den aus der Treibstoffkammer (T) austretenden Gasstrom beaufschlagte Trennwand (6) vorgesehen, die wenigstens eine erste Öffnung (7) und wenigstens eine zweite Öffnung (8) aufweist, wobei die zweite Öffnung in bekannter Art mit den Filtern (9) abgedeckt ist und den Hauptweg (10) für den die Schutzvorrichtung betätigenden Gasstrom bildet;
  • b) die erste Öffnung (7), durch die der Gasstrom auf einem gegenüber dem Hauptweg wesentlich widerstandsärmeren Nebenweg (11) zur Schutz­ vorrichtung geführt wird, ist mit einer beweglichen, die erste Öff­ nung (7) normalerweise freigebenden Abdeckung (1) versehen, deren Material- und Geometrie-Eigenschaften so gewählt sind, daß sie ober­ halb einer einstellbaren Schwelle der Umgebungstemperatur die erste Öffnung (7) verschließt.
1. Device for a gas generator of a motor vehicle occupant protection device which has a filter chamber which closes the fuel chamber and is connected to it by openings with filters for the escaping gas stream, characterized by the following features:
  • a) in the filter chamber ( F ) is a partition wall ( 6 ) which is acted upon by the gas stream emerging from the fuel chamber ( T ) and has at least one first opening ( 7 ) and at least one second opening ( 8 ), the second opening in known type is covered with the filters ( 9 ) and forms the main path ( 10 ) for the gas flow actuating the protective device;
  • b is performed), the first opening (7) through which the gas stream on a relative to the main path much more resistant poorer secondary path (11) device for protection, is provided with a movable, the first Publ voltage (7) is normally releasing the cover (1), whose material and geometry properties are selected so that it closes the first opening ( 7 ) above half an adjustable threshold of the ambient temperature.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Bewegung der Abdeckung (1) in Abhängigkeit vom Staudruck des Gasstromes und/oder der Temperatur steuerbar ist.2. Device according to claim 1, characterized in that the movement of the cover ( 1 ) depending on the dynamic pressure of the gas stream and / or the temperature is controllable. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Abdeckung (1) aus einem Aluminiumblech geeigneter Wandstärke be­ steht.3. Apparatus according to claim 1 or 2, characterized in that the cover ( 1 ) be made of an aluminum sheet of suitable wall thickness.
DE19893921472 1989-06-30 1989-06-30 Device for gas generator - in which gas for inflating cushion for protecting travellers in vehicle crash can take two routes to gas outlet Expired - Fee Related DE3921472C1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19893921472 DE3921472C1 (en) 1989-06-30 1989-06-30 Device for gas generator - in which gas for inflating cushion for protecting travellers in vehicle crash can take two routes to gas outlet
US07/526,704 US5054811A (en) 1989-06-30 1990-05-22 Arrangement for an airbag gas generator
JP2163013A JPH0365453A (en) 1989-06-30 1990-06-22 Device for gas generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893921472 DE3921472C1 (en) 1989-06-30 1989-06-30 Device for gas generator - in which gas for inflating cushion for protecting travellers in vehicle crash can take two routes to gas outlet

Publications (1)

Publication Number Publication Date
DE3921472C1 true DE3921472C1 (en) 1990-11-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893921472 Expired - Fee Related DE3921472C1 (en) 1989-06-30 1989-06-30 Device for gas generator - in which gas for inflating cushion for protecting travellers in vehicle crash can take two routes to gas outlet

Country Status (2)

Country Link
JP (1) JPH0365453A (en)
DE (1) DE3921472C1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538665A1 (en) * 1991-10-19 1993-04-28 TEMIC Bayern-Chemie Airbag GmbH Gas generator
EP0733520A1 (en) * 1995-03-24 1996-09-25 Morton International, Inc. An airbag inflator having a housing protected from high-temperature, reactive generated gases
DE19541798A1 (en) * 1995-11-09 1997-05-15 Temic Bayern Chem Airbag Gmbh Gas generator with regulation of the propellant gas flow path and method for its operation
EP1571049A1 (en) * 2002-12-09 2005-09-07 Daicel Chemical Industries, Ltd. Gas generator for air bag
US7172214B2 (en) 2002-12-09 2007-02-06 Daicel Chemical Industries, Ltd. Gas generator for air bag
DE102006060580A1 (en) * 2006-12-19 2008-07-03 Carl Freudenberg Kg Filter arrangement with a separating element
US8028627B2 (en) 2007-10-05 2011-10-04 Takata-Petri Ag Gas generator and method for influencing a gas flow in a gas generator
CN111433083A (en) * 2017-12-05 2020-07-17 株式会社大赛璐 Igniter assembly and gas generator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3147780A1 (en) * 1981-02-26 1982-09-09 The Firestone Tire & Rubber Co., 44317 Akron, Ohio PASSIVE CLAMPING AND IMPACT LOCKING DEVICE FOR VEHICLE VEHICLE occupants HAVING A CUSHION OR CUSHION INFLATED BY A FLUID GENERATOR. AIR BAG
US4380346A (en) * 1981-04-24 1983-04-19 Thiokol Corporation Method of and apparatus for speeding the response of an air bag inflator at low temperatures
DE3733436A1 (en) * 1986-10-03 1988-04-21 Trw Automotive Products Inc INFLATABLE RESTRAINT SYSTEM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3147780A1 (en) * 1981-02-26 1982-09-09 The Firestone Tire & Rubber Co., 44317 Akron, Ohio PASSIVE CLAMPING AND IMPACT LOCKING DEVICE FOR VEHICLE VEHICLE occupants HAVING A CUSHION OR CUSHION INFLATED BY A FLUID GENERATOR. AIR BAG
US4380346A (en) * 1981-04-24 1983-04-19 Thiokol Corporation Method of and apparatus for speeding the response of an air bag inflator at low temperatures
DE3733436A1 (en) * 1986-10-03 1988-04-21 Trw Automotive Products Inc INFLATABLE RESTRAINT SYSTEM

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538665A1 (en) * 1991-10-19 1993-04-28 TEMIC Bayern-Chemie Airbag GmbH Gas generator
EP0733520A1 (en) * 1995-03-24 1996-09-25 Morton International, Inc. An airbag inflator having a housing protected from high-temperature, reactive generated gases
DE19541798A1 (en) * 1995-11-09 1997-05-15 Temic Bayern Chem Airbag Gmbh Gas generator with regulation of the propellant gas flow path and method for its operation
EP1571049A1 (en) * 2002-12-09 2005-09-07 Daicel Chemical Industries, Ltd. Gas generator for air bag
EP1571049A4 (en) * 2002-12-09 2006-03-08 Daicel Chem GAS GENERATOR FOR AIRBAG
US7172214B2 (en) 2002-12-09 2007-02-06 Daicel Chemical Industries, Ltd. Gas generator for air bag
DE102006060580A1 (en) * 2006-12-19 2008-07-03 Carl Freudenberg Kg Filter arrangement with a separating element
DE102006060580B4 (en) * 2006-12-19 2009-04-30 Carl Freudenberg Kg Filter arrangement for filtering a fluid medium
US8028627B2 (en) 2007-10-05 2011-10-04 Takata-Petri Ag Gas generator and method for influencing a gas flow in a gas generator
CN111433083A (en) * 2017-12-05 2020-07-17 株式会社大赛璐 Igniter assembly and gas generator
CN111433083B (en) * 2017-12-05 2022-01-28 株式会社大赛璐 Igniter assembly and gas generator

Also Published As

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