WO1999036293A1 - Ignition device for a gas generator - Google Patents
Ignition device for a gas generator Download PDFInfo
- Publication number
- WO1999036293A1 WO1999036293A1 PCT/EP1999/000297 EP9900297W WO9936293A1 WO 1999036293 A1 WO1999036293 A1 WO 1999036293A1 EP 9900297 W EP9900297 W EP 9900297W WO 9936293 A1 WO9936293 A1 WO 9936293A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ignition
- ignition device
- contact elements
- housing
- plug
- 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.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/703—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
- H01R13/7036—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part the switch being in series with coupling part, e.g. dead coupling, explosion proof coupling
- H01R13/7037—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part the switch being in series with coupling part, e.g. dead coupling, explosion proof coupling making use of a magnetically operated switch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
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- 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
- B60R2021/26029—Ignitors
Definitions
- the present invention relates to an ignition device for a gas generator, in particular an airbag of a motor vehicle, with a housing for receiving a propellant, with an ignition unit which has an ignition charge and first contact elements connected to the ignition charge, and with a plug with second contact elements, which can be connected in an electrically conductive manner to the operation of the ignition device with the first contact elements.
- DE 28 30 552 discloses a short-circuit protection for the contact elements of an ignition device, which is only canceled when the ignition device is connected to an ignition circuit when the connection of the contact elements to the corresponding poles of the connecting line has been established.
- the short-circuit protection comprises contact springs which are in an electrically conductive connection with one another and before the ignition device is connected to the contact elements of the ignition device.
- the contact elements protrude from the housing of the ignition device in such a way that the electrical connection between the ignition device and the connecting line is established before the short-circuit protection device is interrupted.
- DE 44 29 175 discloses an electrical detonator in which the contact pins which are in electrical connection with the ignition charge are arranged at a defined distance from an annular pole element which surrounds the contact pins and is in electrically conductive connection with the housing of the detonator.
- the distance between the annular pole element and the contact pins is aligned with an intended breakdown field strength.
- the plug has at least one first pole element and that, at least when the plug is plugged in, a discharge path is provided between the first pole element and a second pole element, which is in electrically conductive connection with the vehicle ground. It is thereby achieved that the discharge path is not formed in the ignition device itself, but in the area of the plug, which means that the probability of an unintentional triggering of the ignition charge in the event of an arcing is effectively reduced both at high and at low voltage values.
- a contact spring which can be electrically conductively connected to the first contact elements is provided as the second pole element.
- Such Contact springs serve to form a short-circuit bridge between the contact elements when the ignition device is not connected.
- the contact springs are removed from the contact elements and, according to the invention, can serve as second pole elements of the discharge path in this position.
- the electrically conductive connection of the contact springs to the housing leads to a good shielding of the ignition device against electromagnetic radiation.
- both pole elements have electrodes that taper to a point.
- the peak effect that can be achieved in this way favors the charge equalization over the spark gap.
- the first pole element has a projection which is electrically connected to the second contact elements and extends in the region of the second pole element through an opening in the jacket of the plug.
- the distance between the projection and the second pole element can be adjusted by the dimension of the projection and by the thickness of the casing.
- two projections are provided, each of which is electrically conductively connected to one of two second contact elements.
- a holder is provided in the housing for fixing the ignition unit, said holder being in electrically conductive connection with the housing and with the second pole element. If a contact spring is provided as the second pole element, it is electrically conductively connected to the holder and, when the plug is not plugged in, to one or more first contact elements of the ignition device. If the plug is plugged in, between the correspondingly removed from the first contact element distant contact spring and the first pole element of the connector formed a spark gap. In this case, the overvoltage is derived by means of the contact spring, the holder and the housing which is electrically connected to the contact springs by the holder.
- An electrical resistance connected to the first contact elements can be arranged in the primer charge.
- the resistor can be in the form of fine metal wires or printed circuit boards. The current flow through the resistor leads to the generation of heat, which causes the ignition charge to ignite. If necessary, the current flow is brought about by trigger electronics, and undesired discharges can be avoided by the arrangement of the spark gap according to the invention.
- an ignition housing which receives the ignition charge is provided and is electrically insulated from the housing of the ignition device. This avoids that a potential difference between the housing of the ignition device and the contact elements leads to a corresponding potential difference between the ignition housing and a trigger element, for example an electrical resistance.
- the priming charge and the first contact elements connected to the priming charge are received in the housing of the ignition device.
- Such an arrangement leads to a particularly effective shielding of the ignition unit against electromagnetic radiation.
- the discharge path between the first and second pole elements can be realized by a spark gap with a defined length.
- the discharge path can be realized by an electronic component, for example a diode or a varistor, with this Construction variant a more controllable discharge can be achieved in a spark gap compared to the sparkover.
- the plug can have an additional third contact element which is in electrically conductive connection with the vehicle ground.
- This third contact element can in turn be connectable to a fourth contact element, which is in electrically conductive connection with the housing of the gas generator, when the plug is inserted into the ignition unit.
- FIG. 7 is a sectional view taken along line A-A in Fig. 5,
- FIG. 11 is a sectional view along the line C-C in Fig. 10 and
- FIG. 12 a further embodiment of an ignition device according to the invention according to FIG. 12 with a plug attached.
- FIG. 1 and 2 show an ignition device according to the prior art in the non-connected (FIG. 1) and in the connected (FIG. 2) state.
- the ignition device consists of the housing 10 in which the ignition unit 30 is arranged.
- the ignition unit 30 comprises the ignition charge 32, the first contact elements 34 connected to the ignition charge, the electrical resistance 36 and the ignition housing 38 in which the ignition charge 32 is received.
- the first contact elements 34 are in electrically conductive contact with the contact springs 50.
- the contact springs 50 are received in the annular insulator 90.
- the holder 80 arranged in the housing 10 serves to fix the ignition unit 30 in the housing 10.
- the first contact elements 34 are in electrically conductive contact with the second contact elements 42 arranged in the plug 40.
- the plugging in of the plug 40 results in the contact springs 50 being separated from the first contact elements 34 by the sheath 70.
- the ignition unit 30, the first 34 and second contact elements 42 and the plug 40 are electrically insulated from the housing 10 of the ignition device, as a result of which a corresponding potential difference can be generated. If an electrostatic field approaches, an arc flashover can occur at the point with the lowest contact resistance. If in particular electrostatic charges of low voltage ( ⁇ 10 kV) are introduced, the Form spark gap in the area of the ignition unit 30, which leads to an undesired triggering of the ignition device.
- FIG. 3 and FIG. 4 show an ignition device according to the invention, in which the arrangement of the housing 10, the ignition unit 30, the holder 80 and the insulator 90 corresponds to the arrangement according to FIGS. 1 and 2.
- the contact springs 50 are electrically conductively connected to the holder 80 and thus to the housing 10.
- the spark gap 100 is specifically arranged in an area that is not in the immediate vicinity of the ignition charge 32.
- the spark gap 100 is created between the projection 60 serving as the first pole element, which is arranged in an electrically conductive manner on one of the second contact elements 42, and the contact spring 50 serving as the second pole element.
- the projection 60 is through the recess 72 Sheath 70 of the connector 40 guided.
- the spark gap 100 has the advantages that, on the one hand, a possible spark gap 100 is created not in the vicinity of the ignition unit 30, but in the area of the plug 40, and on the other hand the electrically conductive connection of the housing 10 to the contact spring 50 good shielding of the ignition device against electromagnetic radiation.
- the spark gap 100 can be formed on one side according to FIG. 4 or on both sides.
- the projection 60 is designed as a tapered electrode, which greatly promotes charge equalization.
- the material of the projection 60 and the contact spring 50 is advantageously made of robust, conductive material which also enables multiple discharges without significant erosion.
- FIG 5 and 6 show a further embodiment of the ignition device according to the invention, in which the ignition charge 32 is received in the ignition housing 38, which is electrically insulated from the housing 10 of the ignition device.
- This has the advantage that a potential difference between the housing 10 and first contact elements 34 do not also require a corresponding potential difference between ignition housing 38 and ignition charge 32.
- the propellant 20 is arranged in the housing 10.
- the contact springs 50 are accommodated in the holder 90 and connected to the housing 10 in an electrically conductive manner.
- the ignition unit 30 comprises an electrical resistor 36 for igniting the ignition charge 32, which is arranged in the end region of the first contact elements 34.
- the plug 40 comprises two second contact elements 42, one of the contact elements 42 being in electrically conductive connection with the projection 60.
- the projection 60 is guided through the recess 72 in the casing 70 of the plug 40.
- the desired spark gap 100 is created, which permits safe discharge outside the area of the ignition charge 32.
- FIG. 7 shows a sectional view along line A-A in FIG. 5 and illustrates the arrangement of the contact springs 50, which are electrically conductively connected to the first contact elements 34 when the plug is not attached.
- the contact springs 50 are arranged on a ring which is received in the holder 90.
- FIG 8 illustrates the arrangement of the projection 60, which is provided on one of the second contact elements 42 of the plug 40.
- the projection 60 extends in the opening 72 of the casing 70 of the plug 40.
- FIGS. 3 and 4 show a further ignition device according to the invention, in which the arrangement of the housing 10, the ignition unit 30, the holder 80 and the insulator 90 corresponds to the arrangement according to FIGS. 3 and 4.
- a spark gap 100 is created between two first pole elements 60 and a third pole element 130. create.
- the pole element 130 likewise consists of a tapered electrode, as can be seen in particular from FIG. 11.
- the spark gaps 100 are arranged in an area that is not in the immediate vicinity of the ignition charge 32.
- the projection 130 serving as the third pole element is, as shown in FIGS. 9 to 11, on the one hand electrically connected to the holder 80 made of metal via the connection 132 and on the other hand to the vehicle mass (GND). As can be seen in FIG.
- recesses 104 are provided in the insulator 90, which go as far as the electrically conductive connecting elements between the contact springs 50 and the electrically conductive holder 80, so that here, as in the inserted state of the plug 40 (FIG 10), an electrical conductor, which is connected to the vehicle ground, can be connected to the contact springs 50 and the holder 80.
- the embodiment according to FIG. 12 essentially corresponds to the embodiment according to FIG. 10.
- the spark gap 100 is replaced by electronic components, in the present case by diodes 120.
- the discharge can be controlled even better compared to the formation of a spark gap.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Air Bags (AREA)
Abstract
Description
Zündvorrichtung für einen Gasgenerator Ignition device for a gas generator
Die vorliegende Erfindung betrifft eine Zündvorrichtung für einen Gasgenerator, insbesondere eines Airbags eines Kraftfahrzeuges, mit einem Gehäuse zur Aufnahme eines Treibmittels, mit einer Zündeinheit, die eine Zündladung sowie mit der Zündladung in Verbindung stehende erste Kontaktelemente aufweist, sowie mit einem Stecker mit zweiten Kontaktelementen, die zum Betrieb der Zündvorrichtung mit den ersten Kontaktelementen elektrisch leitend verbindbar sind.The present invention relates to an ignition device for a gas generator, in particular an airbag of a motor vehicle, with a housing for receiving a propellant, with an ignition unit which has an ignition charge and first contact elements connected to the ignition charge, and with a plug with second contact elements, which can be connected in an electrically conductive manner to the operation of the ignition device with the first contact elements.
In der DE 28 30 552 wird eine Kurzschlußsicherung für die Kontaktelemente einer Zündvorrichtung offenbart, die bei Anschluß der Zündvorrichtung an einen Zündstromkreis erst dann aufgehoben wird, wenn die Verbindung der Kontaktelemente mit den entsprechenden Polen der Anschlußleitung hergestellt ist. Die Kurzschlußsicherung umfaßt Kontaktfedern, die untereinander sowie vor Anschluß der Zündvorrichtung mit den Kontaktelementen der Zündvorrichtung in elektrisch leitender Verbindung stehen. Um unerwünschte Zustände während der Montage und Demontage der Zündvorrichtung zu vermeiden, stehen die Kontaktelemente derart aus dem Gehäuse der Zündvorrichtung hervor, daß die elektrische Verbindung zwischen Zündvorrichtung und Anschlußleitung hergestellt wird, bevor die Unterbrechung der Kurzschlußsicherung erfolgt. Bei einer derartigen Vorrichtung ist es nachteilig, daß ein wirksamer Schutz gegen eine elektrostatische Entladung aufgrund von Potentialdifferenzen zwischen den Kontaktelementen bzw. der Zündla- dung und einem die Zündvorrichtung umgebenden Gehäuse nicht vorhanden ist. Kommt es zu einem Lichtbogenüberschlag, kann dies zu einer Fehlauslösung der Zündladung und somit beispielsweise zu einem unerwünschten Auslösen des Air- bags führen.DE 28 30 552 discloses a short-circuit protection for the contact elements of an ignition device, which is only canceled when the ignition device is connected to an ignition circuit when the connection of the contact elements to the corresponding poles of the connecting line has been established. The short-circuit protection comprises contact springs which are in an electrically conductive connection with one another and before the ignition device is connected to the contact elements of the ignition device. In order to avoid undesirable conditions during the assembly and disassembly of the ignition device, the contact elements protrude from the housing of the ignition device in such a way that the electrical connection between the ignition device and the connecting line is established before the short-circuit protection device is interrupted. With such a device, it is disadvantageous that effective protection against electrostatic discharge due to potential differences between the contact elements or the ignition tion and a housing surrounding the ignition device is not present. If an arcing occurs, this can lead to incorrect triggering of the primer charge and thus, for example, to undesired triggering of the airbag.
Die DE 44 29 175 offenbart einen elektrischen Zünder, bei dem die mit der Zündladung in elektrischer Verbindung stehenden Kontaktstifte in einem definierten Abstand zu einem die Kontaktstifte umgebenden ringförmigen Polelement angeordnet sind, das in elektrisch leitender Verbindung mit dem Gehäuse des Zünders steht. Der Abstand zwischen dem ringförmigen Polelement und den Kontaktstiften ist auf eine vorgesehene Durchschlagfeldstärke ausgerichtet. Trotz Ausbildung einer derartigen Funkenstrecke ist es möglich, daß insbesondere bei Annäherung eines elektrostatischen Feldes geringer Spannung eine Entladung nicht im Bereich der vorgesehenen Funkenstrecke, sondern im Bereich der Zündladung erfolgt, was eine unerwünschte Fehlzündung zur Folge haben kann.DE 44 29 175 discloses an electrical detonator in which the contact pins which are in electrical connection with the ignition charge are arranged at a defined distance from an annular pole element which surrounds the contact pins and is in electrically conductive connection with the housing of the detonator. The distance between the annular pole element and the contact pins is aligned with an intended breakdown field strength. Despite the formation of such a spark gap, it is possible that, particularly when a low voltage electrostatic field approaches, a discharge does not take place in the area of the intended spark gap but in the area of the ignition charge, which can result in undesired misfire.
Es ist die Aufgabe der vorliegenden Erfindung, eine Zündvorrichtung zu schaffen, bei der die Wahrscheinlichkeit für ein unerwünschtes Auslösen der Zündladung aufgrund einer elektrostatischen Entladung gering ist.It is the object of the present invention to provide an ignition device in which the probability of an undesired triggering of the ignition charge due to an electrostatic discharge is low.
Diese Aufgabe wird ausgehend von einer gattungsgemäßen Zündvorrichtung dadurch gelöst, daß der Stecker wenigstens ein erstes Polelement aufweist und daß zumindest bei aufgestecktem Stecker ein Entladungsweg zwischen dem ersten Polelement und einem zweiten Polelement, das mit der Fahrzeugmasse in elektrisch leitender Verbindung steht, vorgesehen ist. Dadurch wird erreicht, daß der Entladungsweg nicht in der Zündvorrichtung selbst, sondern im Bereich des Stekkers ausgebildet ist, was dazu führt, daß die Wahrscheinlichkeit für ein unbeabsichtigtes Auslösen der Zündladung bei einem Lichtbogenüberschlag sowohl bei hohen als auch bei geringen Spannungswerten wirksam verringert wird.This object is achieved on the basis of a generic ignition device in that the plug has at least one first pole element and that, at least when the plug is plugged in, a discharge path is provided between the first pole element and a second pole element, which is in electrically conductive connection with the vehicle ground. It is thereby achieved that the discharge path is not formed in the ignition device itself, but in the area of the plug, which means that the probability of an unintentional triggering of the ignition charge in the event of an arcing is effectively reduced both at high and at low voltage values.
Besonders vorteilhaft ist es, wenn als .zweites Polelement eine mit den ersten Kontaktelementen elektrisch leitend verbindbare Kontaktfeder vorgesehen ist. Derartige Kontaktfedern dienen dazu, im nicht angeschlossenen Zustand der Zündvorrichtung eine Kurzschlußbrücke zwischen den Kontaktelementen zu bilden. Bei Aufstecken eines Steckers zum Anschluß der Zündvorrichtung werden die Kontaktfedern von den Kontaktelementen entfernt und können in dieser Position erfindungsgemäß als zweite Polelemente des Entladungsweges dienen. Darüber hinaus führt die elektrisch leitende Verbindung der Kontaktfedern mit dem Gehäuse zu einer guten Abschirmung der Zündvorrichtung gegen elektromagnetische Strahlung.It is particularly advantageous if a contact spring which can be electrically conductively connected to the first contact elements is provided as the second pole element. Such Contact springs serve to form a short-circuit bridge between the contact elements when the ignition device is not connected. When a plug is plugged in to connect the ignition device, the contact springs are removed from the contact elements and, according to the invention, can serve as second pole elements of the discharge path in this position. In addition, the electrically conductive connection of the contact springs to the housing leads to a good shielding of the ignition device against electromagnetic radiation.
In weiterer Ausgestaltung der vorliegenden Erfindung ist vorgesehen, daß beide Polelemente spitz zulaufende Elektroden aufweisen. Die dadurch erzielbare Spitzenwirkung begünstigt den Ladungsausgleich über die Funkenstrecke.In a further embodiment of the present invention, it is provided that both pole elements have electrodes that taper to a point. The peak effect that can be achieved in this way favors the charge equalization over the spark gap.
Besonders vorteilhaft ist es, wenn das erste Polelement einen mit den zweiten Kontaktelementen elektrisch verbundenen Vorsprung aufweist, der sich im Bereich des zweiten Polelementes durch einen Durchbruch der Ummantelung des Steckers erstreckt. Dabei ist der Abstand zwischen Vorsprung und dem zweiten Polelement durch die Dimension des Vorsprungs sowie durch die Dicke der Ummantelung einstellbar. Durch die Verbindung des Vorsprungs mit den zweiten, im Stecker angeordneten Kontaktelementen wird eine zuverlässige Entladung im Bereich des Stekkers bewirkt und eine Fehlzündung der Zündladung vermieden.It is particularly advantageous if the first pole element has a projection which is electrically connected to the second contact elements and extends in the region of the second pole element through an opening in the jacket of the plug. The distance between the projection and the second pole element can be adjusted by the dimension of the projection and by the thickness of the casing. By connecting the projection to the second contact elements arranged in the plug, a reliable discharge is effected in the area of the plug and a misfire of the ignition charge is avoided.
Gemäß einer bevorzugten Ausgestaltung der vorliegenden Erfindung sind zwei Vorsprünge vorgesehen, die mit jeweils einem von zwei zweiten Kontaktelementen elektrisch leitend verbunden sind.According to a preferred embodiment of the present invention, two projections are provided, each of which is electrically conductively connected to one of two second contact elements.
In weiterer Ausgestaltung der vorliegenden Erfindung ist in dem Gehäuse zur Fixierung der Zündeinheit eine Halterung vorgesehen, die mit dem Gehäuse sowie mit dem zweiten Polelement in elektrisch leitender Verbindung steht. Ist als .zweites Polelement eine Kontaktfeder vorgesehen, ist diese mit der Halterung sowie im nicht aufgesteckten Zustand des Steckers mit einem oder mehreren ersten Kontaktelementen der Zündvorrichtung elektrisch leitend verbunden. Wird der Stecker aufgesteckt, wird zwischen der entsprechend von dem ersten Kontaktelement ent- fernten Kontaktfeder und dem ersten Polelement des Steckers eine Funkenstrecke gebildet. Die Ableitung der Überspannung erfolgt in diesem Fall mittels der Kontaktfeder, der Halterung sowie des durch die Halterung mit den Kontaktfedern elektrisch verbundenen Gehäuses.In a further embodiment of the present invention, a holder is provided in the housing for fixing the ignition unit, said holder being in electrically conductive connection with the housing and with the second pole element. If a contact spring is provided as the second pole element, it is electrically conductively connected to the holder and, when the plug is not plugged in, to one or more first contact elements of the ignition device. If the plug is plugged in, between the correspondingly removed from the first contact element distant contact spring and the first pole element of the connector formed a spark gap. In this case, the overvoltage is derived by means of the contact spring, the holder and the housing which is electrically connected to the contact springs by the holder.
In der Zündladung kann ein mit den ersten Kontaktelementen in Verbindung stehender elektrischer Widerstand angeordnet sein. Der Widerstand kann in Form feiner Metalldrähte oder Leiterplatten ausgeführt sein. Der Stromfluß durch den Widerstand führt zu einer Wärmeentwicklung, die eine Zündung der Zündladung bewirkt. Der Stromfluß wird im Bedarfsfall durch eine Auslöseelektronik bewirkt, wobei unerwünschte Entladungen durch die erfindungsgemäße Anordnung der Funkenstrecke vermeidbar sind.An electrical resistance connected to the first contact elements can be arranged in the primer charge. The resistor can be in the form of fine metal wires or printed circuit boards. The current flow through the resistor leads to the generation of heat, which causes the ignition charge to ignite. If necessary, the current flow is brought about by trigger electronics, and undesired discharges can be avoided by the arrangement of the spark gap according to the invention.
Besonders vorteilhaft ist es, wenn ein die Zündladung aufnehmendes Zündgehäuse vorgesehen ist, das gegenüber dem Gehäuse der Zündvorrichtung elektrisch isoliert ist. Dadurch wird vermieden, daß eine Potentialdifferenz zwischen dem Gehäuse der Zündvorrichtung und den Kontaktelementen zu einer entsprechenden Potentialdifferenz zwischen dem Zündgehäuse und einem Auslöseelement, beispielsweise einem elektrischen Widerstand, führt.It is particularly advantageous if an ignition housing which receives the ignition charge is provided and is electrically insulated from the housing of the ignition device. This avoids that a potential difference between the housing of the ignition device and the contact elements leads to a corresponding potential difference between the ignition housing and a trigger element, for example an electrical resistance.
In weiterer Ausgestaltung der vorliegenden Erfindung ist vorgesehen, daß die Zündladung sowie die mit der Zündladung in Verbindung stehenden ersten Kontaktelemente in dem Gehäuse der Zündvorrichtung aufgenommen sind. Eine derartige Anordnung führt zu einer besonders wirksamen Abschirmung der Zündeinheit gegen elektromagnetische Strahlung.In a further embodiment of the present invention it is provided that the priming charge and the first contact elements connected to the priming charge are received in the housing of the ignition device. Such an arrangement leads to a particularly effective shielding of the ignition unit against electromagnetic radiation.
Entsprechend einer Alternative der Erfindung kann der Entladungsweg zwischen dem ersten und zweiten Polelement durch eine Funkenstrecke mit definierter Länge verwirklicht werden.According to an alternative of the invention, the discharge path between the first and second pole elements can be realized by a spark gap with a defined length.
Alternativ hierzu kann der Entladungsweg durch ein elektronisches Bauteil, beispielsweise eine Diode oder einen Varistor verwirklicht sein, wobei durch diese Bauvariante eine besser kontrollierbare Entladung im Vergleich zum Funkenüberschlag in einer Funkenstrecke erzielt werden kann.As an alternative to this, the discharge path can be realized by an electronic component, for example a diode or a varistor, with this Construction variant a more controllable discharge can be achieved in a spark gap compared to the sparkover.
Gemäß einer weiteren vorteilhaften Ausführungsform der Erfindung kann der Stekker ein zusätzliches drittes Kontaktelement aufweisen, das mit der Fahrzeugmasse in elektrisch leitender Verbindung steht. Dieses dritte Kontaktelement kann wiederum mit einem vierten Kontaktelement, das mit dem Gehäuse des Gasgenerators in elektrisch leitender Verbindung steht, bei Einstecken des Steckers in die Zündeinheit verbindbar sein.According to a further advantageous embodiment of the invention, the plug can have an additional third contact element which is in electrically conductive connection with the vehicle ground. This third contact element can in turn be connectable to a fourth contact element, which is in electrically conductive connection with the housing of the gas generator, when the plug is inserted into the ignition unit.
Weitere Einzelheiten und Vorteile der vorliegenden Erfindung werden anhand in der Zeichnung dargestellter Ausführungsbeispiele gemäß Fig. 3 - Fig. 12 näher erläutert. Es zeigen:Further details and advantages of the present invention are explained in more detail with reference to exemplary embodiments shown in the drawing according to FIGS. 3-12. Show it:
Fig. 1 undFig. 1 and
Fig. 2: Eine Zündvorrichtung gemäß dem Stand der Technik ohne und mit aufgestecktem Stecker,2: an ignition device according to the prior art without and with plug inserted,
Fig. 3 undFig. 3 and
Fig. 4: eine erfindungsgemäße Zündvorrichtung ohne und mit aufgestecktem Stecker sowie mit Kontaktfeder als .zweites Polelement,4: an ignition device according to the invention without and with a plug plugged in and with a contact spring as a second pole element,
Fig. 5: eine erfindungsgemäße Zündvorrichtung mit Stecker sowie mit5: an ignition device according to the invention with a plug and with
Kontaktfeder als zweites Polelement,Contact spring as second pole element,
Fig. 6: eine erfindungsgemäße Zündvorrichtung gemäß Fig. 5 mit aufgestecktem Stecker,6: an ignition device according to the invention according to FIG. 5 with a plug,
Fig. 7: eine Schnittdarstellung gemäß Linie A-A in Fig. 5,7 is a sectional view taken along line A-A in Fig. 5,
Fig. 8: eine Schnittdarstellung gemäß Linie B-B in Fig. 5, Fig. 9 und8 is a sectional view along line BB in Fig. 5, Fig. 9 and
Fig. 10: eine weitere Ausführungsform einer erfindungsgemäßen Zündvorrichtung ohne und mit aufgestecktem Stecker,10: a further embodiment of an ignition device according to the invention without and with plug inserted,
Fig. 11 : eine Schnittdarstellung gemäß der Linie C-C in Fig. 10 und11 is a sectional view along the line C-C in Fig. 10 and
Fig. 12: eine weitere Ausführungsform einer erfindungsgemäßen Zündvorrichtung gemäß Fig. 12 mit aufgestecktem Stecker.FIG. 12: a further embodiment of an ignition device according to the invention according to FIG. 12 with a plug attached.
Fig. 1 und Fig. 2 zeigen eine Zündvorrichtung gemäß dem Stand der Technik im nicht angeschlossenen (Fig. 1 ) sowie im angeschlossenen (Fig. 2) Zustand. Die Zündvorrichtung besteht aus dem Gehäuse 10, in dem die Zündeinheit 30 angeordnet ist. Die Zündeinheit 30 umfaßt die Zündladung 32, die mit der Zündladung in Verbindung stehenden ersten Kontaktelemente 34, den elektrischen Widerstand 36 sowie das Zündgehäuse 38, in dem die Zündladung 32 aufgenommen ist. Die ersten Kontaktelemente 34 stehen im nicht angeschlossenen Zustand der Zündvorrichtung mit den Kontaktfedern 50 in elektrisch leitendem Kontakt. Die Kontaktfedern 50 sind in dem ringförmigen Isolator 90 aufgenommen. Die in dem Gehäuse 10 angeordnete Halterung 80 dient zur Fixierung der Zündeinheit 30 in dem Gehäuse 10.1 and 2 show an ignition device according to the prior art in the non-connected (FIG. 1) and in the connected (FIG. 2) state. The ignition device consists of the housing 10 in which the ignition unit 30 is arranged. The ignition unit 30 comprises the ignition charge 32, the first contact elements 34 connected to the ignition charge, the electrical resistance 36 and the ignition housing 38 in which the ignition charge 32 is received. When the ignition device is not connected, the first contact elements 34 are in electrically conductive contact with the contact springs 50. The contact springs 50 are received in the annular insulator 90. The holder 80 arranged in the housing 10 serves to fix the ignition unit 30 in the housing 10.
Wird beim Anschluß der Zündvorrichtung der Stecker 40 aufgesteckt (s. Fig. 2), stehen die ersten Kontaktelemente 34 mit den in dem Stecker 40 angeordneten zweiten Kontaktelementen 42 in elektrisch leitendem Kontakt. Das Aufstecken des Steckers 40 hat eine Trennung der Kontaktfedern 50 von den ersten Kontaktelementen 34 durch die Ummantelung 70 zur Folge. In diesem Zustand sind die Zündeinheit 30, die ersten 34 und zweiten Kontaktelemente 42 bzw. der Stecker 40 von dem Gehäuse 10 der Zündvorrichtung elektrisch isoliert, wodurch eine entsprechende Potentialdifferenz erzeugt werden kann. Kommt es zur Annäherung eines elektrostatischen Feldes, kann es an der Stelle mit dem geringsten Übergangswiderstand zu einem Lichtbogenüberschlag kommen. Werden insbesondere elektrostatische Ladungen geringer Spannung (< 10 kV) eingebracht, kann sich die Funkenstrecke im Bereich der Zündeinheit 30 ausbilden, was zu einer unerwünschten Auslösung der Zündvorrichtung führt.If the plug 40 is plugged in when the ignition device is connected (see FIG. 2), the first contact elements 34 are in electrically conductive contact with the second contact elements 42 arranged in the plug 40. The plugging in of the plug 40 results in the contact springs 50 being separated from the first contact elements 34 by the sheath 70. In this state, the ignition unit 30, the first 34 and second contact elements 42 and the plug 40 are electrically insulated from the housing 10 of the ignition device, as a result of which a corresponding potential difference can be generated. If an electrostatic field approaches, an arc flashover can occur at the point with the lowest contact resistance. If in particular electrostatic charges of low voltage (<10 kV) are introduced, the Form spark gap in the area of the ignition unit 30, which leads to an undesired triggering of the ignition device.
Fig. 3 und Fig. 4 zeigen eine erfindungsgemäße Zündvorrichtung, bei der die Anordnung des Gehäuses 10, der Zündeinheit 30, der Halterung 80 sowie des Isolators 90 der Anordnung gemäß Fig. 1 und Fig. 2 entspricht. Gemäß dem Ausführungsbeispiel nach Fig. 3 und Fig. 4 sind die Kontaktfedern 50 elektrisch leitend mit der Halterung 80 und somit mit dem Gehäuse 10 verbunden.3 and FIG. 4 show an ignition device according to the invention, in which the arrangement of the housing 10, the ignition unit 30, the holder 80 and the insulator 90 corresponds to the arrangement according to FIGS. 1 and 2. According to the exemplary embodiment according to FIGS. 3 and 4, the contact springs 50 are electrically conductively connected to the holder 80 and thus to the housing 10.
Im angeschlossenen Zustand der Zündvorrichtung gemäß Fig. 4 ist die Funkenstrecke 100 gezielt in einem Bereich angeordnet, der sich nicht in unmittelbarer Nähe zur Zündladung 32 befindet. Gemäß dem Ausführungsbeispiel nach Fig. 4 entsteht die Funkenstrecke 100 zwischen dem als ersten Polelement dienenden Vorsprung 60, der elektrisch leitend an einem der zweiten Kontaktelemente 42 angeordnet ist, und der als zweites Polelement dienenden Kontaktfeder 50. Der Vorsprung 60 ist durch die Aussparung 72 der Ummantelung 70 des Steckers 40 geführt. Die erfindungsgemäße Vorrichtung nach Fig. 4 weist die Vorteile auf, daß zum einen eine mögliche Funkenstrecke 100 nicht in der Nähe zur Zündeinheit 30, sondern im Bereich des Steckers 40 geschaffen wird und zum anderen die elektrisch leitende Verbindung des Gehäuses 10 mit der Kontaktfeder 50 eine gute Abschirmung der Zündvorrichtung gegen elektromagnetische Strahlung bewirkt. Die Funkenstrecke 100 kann einseitig gemäß Fig. 4 oder auch beidseitig ausgebildet sein. Der Vorsprung 60 ist als spitz zulaufende Elektrode ausgebildet, die einen Ladungsausgleich stark begünstigt. Das Material des Vorsprungs 60 sowie der Kontaktfeder 50 ist vorteilhaft aus robustem, leitfähigem Material hergestellt, das auch Mehrfachentladungen ohne wesentlichen Abbrand ermöglicht.In the connected state of the ignition device according to FIG. 4, the spark gap 100 is specifically arranged in an area that is not in the immediate vicinity of the ignition charge 32. According to the exemplary embodiment according to FIG. 4, the spark gap 100 is created between the projection 60 serving as the first pole element, which is arranged in an electrically conductive manner on one of the second contact elements 42, and the contact spring 50 serving as the second pole element. The projection 60 is through the recess 72 Sheath 70 of the connector 40 guided. The device according to the invention according to FIG. 4 has the advantages that, on the one hand, a possible spark gap 100 is created not in the vicinity of the ignition unit 30, but in the area of the plug 40, and on the other hand the electrically conductive connection of the housing 10 to the contact spring 50 good shielding of the ignition device against electromagnetic radiation. The spark gap 100 can be formed on one side according to FIG. 4 or on both sides. The projection 60 is designed as a tapered electrode, which greatly promotes charge equalization. The material of the projection 60 and the contact spring 50 is advantageously made of robust, conductive material which also enables multiple discharges without significant erosion.
Fig. 5 und Fig. 6 zeigen eine weitere Ausführungsform der erfindungsgemäßen Zündvorrichtung, bei der die Zündladung 32 in dem Zündgehäuse 38 aufgenommen ist, das gegenüber dem Gehäuse 10 der Zündvorrichtung elektrisch isoliert ist. Daraus ergibt sich der Vorteil, daß eine Potentialdifferenz zwischen Gehäuse 10 und ersten Kontaktelementen 34 nicht auch eine entsprechende Potentialdifferenz zwischen Zündgehäuse 38 und Zündladung 32 bedingt.5 and 6 show a further embodiment of the ignition device according to the invention, in which the ignition charge 32 is received in the ignition housing 38, which is electrically insulated from the housing 10 of the ignition device. This has the advantage that a potential difference between the housing 10 and first contact elements 34 do not also require a corresponding potential difference between ignition housing 38 and ignition charge 32.
In dem Gehäuse 10 ist das Treibmittel 20 angeordnet. Die Kontaktfedern 50 sind in der Halterung 90 aufgenommen und elektrisch leitend mit dem Gehäuse 10 verbunden. Die Zündeinheit 30 umfaßt zur Zündung der Zündladung 32 einen elektrischen Widerstand 36, der im Endbereich der ersten Kontaktelemente 34 angeordnet ist.The propellant 20 is arranged in the housing 10. The contact springs 50 are accommodated in the holder 90 and connected to the housing 10 in an electrically conductive manner. The ignition unit 30 comprises an electrical resistor 36 for igniting the ignition charge 32, which is arranged in the end region of the first contact elements 34.
Der Stecker 40 umfaßt zwei zweite Kontaktelemente 42, wobei eines der Kontaktelemente 42 mit dem Vorsprung 60 in elektrisch leitender Verbindung steht. Der Vorsprung 60 ist durch die Aussparung 72 der Ummantelung 70 des Steckers 40 geführt. Wie Fig. 6 zeigt, entsteht im aufgesteckten Zustand des Steckers 40 zwischen dem Vorsprung 60 und der Kontaktfeder 50 die gewünschte Funkenstrecke 100, die eine sichere Entladung außerhalb des Bereichs der Zündladung 32 gestattet.The plug 40 comprises two second contact elements 42, one of the contact elements 42 being in electrically conductive connection with the projection 60. The projection 60 is guided through the recess 72 in the casing 70 of the plug 40. As shown in FIG. 6, in the plugged-in state of the plug 40 between the projection 60 and the contact spring 50, the desired spark gap 100 is created, which permits safe discharge outside the area of the ignition charge 32.
Fig. 7 zeigt eine Schnittdarstellung gemäß Linie A-A in Fig. 5 und verdeutlicht die Anordnung der Kontaktfedern 50, die bei nicht aufgestecktem Stecker elektrisch leitend mit den ersten Kontaktelementen 34 in Verbindung stehen. Die Kontaktfedern 50 sind auf einem Ring angeordnet, der in der Halterung 90 aufgenommen ist.FIG. 7 shows a sectional view along line A-A in FIG. 5 and illustrates the arrangement of the contact springs 50, which are electrically conductively connected to the first contact elements 34 when the plug is not attached. The contact springs 50 are arranged on a ring which is received in the holder 90.
Fig. 8 verdeutlicht die Anordnung des Vorsprungs 60, der an einem der zweiten Kontaktelemente 42 des Steckers 40 vorgesehen ist. Der Vorsprung 60 erstreckt sich in dem Durchbruch 72 der Ummantelung 70 des Steckers 40.8 illustrates the arrangement of the projection 60, which is provided on one of the second contact elements 42 of the plug 40. The projection 60 extends in the opening 72 of the casing 70 of the plug 40.
Fig. 9, Fig. 10 und Fig. 11 zeigen eine weitere erfindungsgemäße Zündvorrichtung, bei der die Anordnung des Gehäuses 10, der Zündeinheit 30, der Halterung 80 sowie des Isolators 90 der Anordnung gemäß der Fig. 3 und 4 entspricht.9, 10 and 11 show a further ignition device according to the invention, in which the arrangement of the housing 10, the ignition unit 30, the holder 80 and the insulator 90 corresponds to the arrangement according to FIGS. 3 and 4.
Gemäß dem Ausführungsbeispiel nach den Fig. 9 bis 11 wird eine Funkenstrecke 100 zwischen zwei ersten Polelementen 60 und einem dritten Polelement 130 ge- schaffen. Das Polelement 130 besteht im hier dargestellten Ausführungsbeispiel ebenfalls aus einer spitz zulaufenden Elektrode, wie dies insbesondere aus der Fig. 11 zu ersehen ist. Auch hier sind die Funkenstrecken 100 in einem Bereich angeordnet, der sich nicht in unmittelbarer Nähe zur Zündladung 32 befindet. Der als drittes Polelement dienende Vorsprung 130 ist, wie in den Fig. 9 bis 11 dargestellt, einerseits über die Verbindung 132 elektrisch leitend mit der aus Metall bestehenden Halterung 80 und andererseits mit der Fahrzeugmasse (GND) verbunden. Wie in der Fig. 9 zu entnehmen ist, sind im Isolator 90 Ausnehmungen 104 vorgesehen, die bis zu den elektrisch leitenden Verbindungselementen zwischen den Kontaktfedern 50 und der elektrisch leitenden Halterung 80 gehen, so daß hier, wie im eingesteckten Zustand des Steckers 40 (Fig. 10) gezeigt, ein elektrischer Leiter, der mit der Fahrzeugmasse in Verbindung steht, mit den Kontaktfedern 50 und der Halterung 80 in Verbindung gebracht werden kann.According to the exemplary embodiment according to FIGS. 9 to 11, a spark gap 100 is created between two first pole elements 60 and a third pole element 130. create. In the exemplary embodiment shown here, the pole element 130 likewise consists of a tapered electrode, as can be seen in particular from FIG. 11. Here, too, the spark gaps 100 are arranged in an area that is not in the immediate vicinity of the ignition charge 32. The projection 130 serving as the third pole element is, as shown in FIGS. 9 to 11, on the one hand electrically connected to the holder 80 made of metal via the connection 132 and on the other hand to the vehicle mass (GND). As can be seen in FIG. 9, recesses 104 are provided in the insulator 90, which go as far as the electrically conductive connecting elements between the contact springs 50 and the electrically conductive holder 80, so that here, as in the inserted state of the plug 40 (FIG 10), an electrical conductor, which is connected to the vehicle ground, can be connected to the contact springs 50 and the holder 80.
Das Ausführungsbeispiel gemäß Fig. 12 entspricht im wesentlichen der Ausführungsform gemäß Fig. 10. Hier ist allerdings die Funkenstrecke 100 durch elektronische Bausteine, im vorliegenden Fall durch Dioden 120 ersetzt. Bei dieser Ausführungsform kann im Vergleich zur Ausbildung einer Funkenstrecke die Entladung noch besser kontrolliert werden. The embodiment according to FIG. 12 essentially corresponds to the embodiment according to FIG. 10. Here, however, the spark gap 100 is replaced by electronic components, in the present case by diodes 120. In this embodiment, the discharge can be controlled even better compared to the formation of a spark gap.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19980028T DE19980028B4 (en) | 1998-01-19 | 1999-01-19 | Ignition device for a gas generator |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19801772.3 | 1998-01-19 | ||
| DE19801772A DE19801772C1 (en) | 1998-01-19 | 1998-01-19 | Igniter for gas generator of motor vehicle airbag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999036293A1 true WO1999036293A1 (en) | 1999-07-22 |
Family
ID=7855005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1999/000297 Ceased WO1999036293A1 (en) | 1998-01-19 | 1999-01-19 | Ignition device for a gas generator |
Country Status (2)
| Country | Link |
|---|---|
| DE (2) | DE19801772C1 (en) |
| WO (1) | WO1999036293A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6435894B2 (en) | 1998-07-15 | 2002-08-20 | Tyco Electronics Logistics Ag | Connector for airbag gas generator |
| EP1672748A1 (en) * | 2004-12-15 | 2006-06-21 | AMPHENOL-TUCHEL ELECTRONICS GmbH | Lockable contact for a connector with a protection against disturbances |
| EP1689047A1 (en) * | 2005-02-02 | 2006-08-09 | AMPHENOL-TUCHEL ELECTRONICS GmbH | Security contact for connector with a shorter bridge with integral switch element |
| EP1689048A1 (en) * | 2005-02-02 | 2006-08-09 | AMPHENOL-TUCHEL ELECTRONICS GmbH | Protection device for an electrical connector for sets of electrical conductors |
| WO2021039328A1 (en) * | 2019-08-30 | 2021-03-04 | 株式会社ダイセル | Igniter holding structure |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10139636C1 (en) * | 2001-08-11 | 2003-04-10 | Preh Elektro Feinmechanik | Electrical resistance measuring device for detonator for passenger restraint gas generator uses spring-loaded contacts for measuring short-circuit, detonator and insulation resistances |
| FR2834134B1 (en) * | 2001-12-21 | 2004-04-02 | Peugeot Citroen Automobiles Sa | PROTECTION DEVICE AGAINST ELECTROSTATIC DISCHARGES OF AN ELECTRICAL APPARATUS, SUCH AS A PYROTECHNIC IGNITER FOR AN INFLATABLE BAG OF A MOTOR VEHICLE |
| DE10348382A1 (en) * | 2003-10-17 | 2005-05-25 | Daimlerchrysler Ag | Pyrotechnic gas generator for road vehicle airbag deployment system has electric contacts with connections to housing to prevent accidental electric discharges igniting detonator |
| DE102007031690B4 (en) * | 2007-07-06 | 2009-06-18 | Electrovac Ag | Metal / fixing material socket for igniters of airbags or the like passenger protection devices and ignition device with such a base |
| DE102008052399B4 (en) * | 2008-10-21 | 2020-03-05 | Trw Airbag Systems Gmbh | Gas generator for a safety device in a vehicle |
| DE102008054675A1 (en) * | 2008-12-15 | 2010-06-24 | Tyco Electronics Amp Gmbh | Electrical plug-in connector, particularly airbag-plug-in connector for motor vehicle, has support for electrical connecting unit of electrical cable and electrical contact unit for electrical contacting of cable |
| JP6706190B2 (en) | 2016-11-29 | 2020-06-03 | 株式会社ダイセル | Gas generator |
| FR3102314B1 (en) * | 2019-10-22 | 2023-05-12 | Aptiv Tech Ltd | Connection set for passive safety device, protected against electrostatic discharge |
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- 1999-01-19 WO PCT/EP1999/000297 patent/WO1999036293A1/en not_active Ceased
- 1999-01-19 DE DE19980028T patent/DE19980028B4/en not_active Expired - Fee Related
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| GB2025711A (en) * | 1978-07-12 | 1980-01-23 | Daimler Benz Ag | Protection arrangement for an electric igniter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6435894B2 (en) | 1998-07-15 | 2002-08-20 | Tyco Electronics Logistics Ag | Connector for airbag gas generator |
| EP1672748A1 (en) * | 2004-12-15 | 2006-06-21 | AMPHENOL-TUCHEL ELECTRONICS GmbH | Lockable contact for a connector with a protection against disturbances |
| US7249960B2 (en) | 2004-12-15 | 2007-07-31 | Amphenol-Tuchel Electronics Gmbh | Contact safety device for pin-and-socket connectors with safety mechanism against interference |
| EP1689047A1 (en) * | 2005-02-02 | 2006-08-09 | AMPHENOL-TUCHEL ELECTRONICS GmbH | Security contact for connector with a shorter bridge with integral switch element |
| EP1689048A1 (en) * | 2005-02-02 | 2006-08-09 | AMPHENOL-TUCHEL ELECTRONICS GmbH | Protection device for an electrical connector for sets of electrical conductors |
| US7247039B2 (en) | 2005-02-02 | 2007-07-24 | Amphenol-Tuchel Electronics Gmbh | Contact safety device for pin-and-socket connectors with a shorting bar with an integrated circuit element |
| WO2021039328A1 (en) * | 2019-08-30 | 2021-03-04 | 株式会社ダイセル | Igniter holding structure |
| JP2021037793A (en) * | 2019-08-30 | 2021-03-11 | 株式会社ダイセル | Ignizer holding structure |
| JP2023101583A (en) * | 2019-08-30 | 2023-07-21 | 株式会社ダイセル | gas generator |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19801772C1 (en) | 1999-04-22 |
| DE19980028B4 (en) | 2008-02-28 |
| DE19980028D2 (en) | 2001-07-12 |
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