EP0118789B1 - Sparking plugs for internal-combustion engines - Google Patents

Sparking plugs for internal-combustion engines Download PDF

Info

Publication number
EP0118789B1
EP0118789B1 EP84101508A EP84101508A EP0118789B1 EP 0118789 B1 EP0118789 B1 EP 0118789B1 EP 84101508 A EP84101508 A EP 84101508A EP 84101508 A EP84101508 A EP 84101508A EP 0118789 B1 EP0118789 B1 EP 0118789B1
Authority
EP
European Patent Office
Prior art keywords
spark gap
spark plug
spark
electrode
capacitor
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
Application number
EP84101508A
Other languages
German (de)
French (fr)
Other versions
EP0118789A1 (en
Inventor
Werner Dr. Dipl.-Ing. Herden
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0118789A1 publication Critical patent/EP0118789A1/en
Application granted granted Critical
Publication of EP0118789B1 publication Critical patent/EP0118789B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/40—Sparking plugs structurally combined with other devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/0807—Closing the discharge circuit of the storage capacitor with electronic switching means
    • F02P3/0823—Closing the discharge circuit of the storage capacitor with electronic switching means with electronic tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P9/00—Electric spark ignition control, not otherwise provided for
    • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/46—Sparking plugs having two or more spark gaps
    • H01T13/462—Sparking plugs having two or more spark gaps in series connection
    • H01T13/465—Sparking plugs having two or more spark gaps in series connection one spark gap being incorporated in the sparking plug

Definitions

  • the invention relates to a spark plug according to the preamble of the main claim;
  • a spark plug is already known (DE-OS 23 63 804, DE-AS 28 10159), in which in the immediate vicinity of the ignition electrodes by means of a capacitor and a spark gap, electrical energy is temporarily stored in an amount which, in the breakdown phase of the ignition spark, is more than conventional Spark plugs causes increased energy turnover.
  • the spark plug according to the invention with the characterizing features of the main claims has the advantage that, in addition to the increased energy consumption in the breakdown phase of the ignition spark, it also has an increased voltage supply, on the basis of an unchanged input voltage to the spark plug.
  • FIG. 1 shows the schematic structure of a spark plug according to the invention in an unscaled representation
  • FIG. 2 shows the equivalent circuit diagram of such a spark plug.
  • the high-voltage spark plug 10 shown in FIG. 1 has an essentially tubular metal housing 11 which has on its outside a screw thread 12, a hexagon key 13 and a sealing seat 14 as a means for installing the spark plug 10 in an engine head (not shown); In the area of its end on the combustion chamber side, this metal housing 11 has a hook-shaped ground electrode 15, which in the present example is designed as a welded-on wire, but can also be of a different configuration.
  • the metal housing 11 comprises in its through bore 16 in a known manner a rotationally symmetrical electrical insulating body 17 which projects at least on the connection side out of the through bore 16 of the metal housing 11.
  • This electrical insulating body 17, which for example essentially consists of aluminum oxide, is composed in the present example of three parts, namely the connection-side head 17/1, an insert 17/2 and a combustion chamber-side foot 17/3.
  • the combustion chamber-side end face 18 of the electrical insulator base 17/3 rests on a shoulder 19 formed on the combustion chamber side in the through bore 16 of the metal housing and is laterally fixed in the through bore 16.
  • a recess 20 is formed in the connection-side end section of the electrical insulating body base 17/3, in which the electrical insulating body insert 17/2 is fixed and fixed.
  • This depression 20 in the electrical insulating body foot 17/3 continues on the combustion chamber side in a longitudinal bore 21/3 with a shoulder 22 located near the end section on the combustion chamber side; this longitudinal bore 21/3 emerges on the combustion chamber side from the end face 18 of the electrical insulator base 17/3 and continues on the connection side in the electrical insulator insert 17/2 as a longitudinal bore 21/2.
  • This longitudinal bore 21/3 and 21/2 continue even further in a longitudinal bore 21/1, which axially passes through the electrical insulator head 17/1.
  • This ElektroisolierEff-head 17/1 has a flange 23 on the combustion chamber side, on the connection-side bevel 24 a flanged edge 25 of the connection-side end portion om metal housing 11 and holds the multi-part electrical insulation body 17 together.
  • sealing means and compensating elements known per se for the different expansion behavior of the different components of this spark plug 10 has been omitted.
  • an electrically conductive connecting bolt 27 which has a thread 28 and a collar 29 on its connection-side end section projecting from the electrical insulating body head 17/1, with which it attaches itself to the supports end face 30 of the electrical insulating body head 17/1.
  • the combustion chamber-side end section of the connecting bolt 27 ends approximately with the combustion chamber-side end face 31 of the electrical insulator head 17/1 and continues in a first electrode 32 of a spark gap 33.
  • This spark gap 33 which is known per se and is preferably enclosed in a capsule 34, is arranged in the longitudinal bore 21/2 of the electrical insulator insert 17/2 and has a second electrode 35, which emerges from the capsule 34 of the spark gap 33 on the combustion chamber side.
  • the second electrode 35 of the spark gap 33 continues in part of the longitudinal bore 21/3 of the electrical insulator base 17/3 and, with a considerable part of its end section on the combustion chamber side, represents a first charge carrier 36 of a capacitor 37; z serves as dielectric.
  • B. a layer of aluminum oxide, which is applied to this first charge carrier 36.
  • the second charge carrier 39 of this capacitor 37 is formed by a metallic tube which rests on the layer-shaped dielectric 38, is closed at its end on the combustion chamber side and emerges as the central electrode 40 from the longitudinal bore 21/3 of the electrical insulating body base 17/3 on the combustion chamber side.
  • This center electrode 40 has on its outside a shoulder 41 with which it is supported on the shoulder 22 in the longitudinal bore 21/3 of the insulator base 17/3.
  • the gap between the center electrode 40 and the ground electrode 15 forms the spark gap 42.
  • two further longitudinal bores 43 and 44 are also formed in the electrical insulator insert 17/2: in each of these longitudinal bores 43 and 44 there is a high-resistance resistor 45 or 46.
  • the resistor 45 is connected on the connection side with the connecting bolt 27 an electrical connector 47 is connected, which is arranged between the combustion chamber-side end face 31 of the electrical insulating body head 17/1 and the electrical insulating body insert 17/2; the combustion chamber end of this resistor 45 is connected to the second charge carrier 39 of the capacitor 37 via a connector 48 which runs at the combustion chamber end of the electrical insulator insert 17/2.
  • the other high-resistance resistor 46 is connected on the connection side to the metal housing 11 via a connector 49 which runs between the combustion-chamber-side end face 31 of the electrical insulating body head 17/1 and the electrical insulating body insert 17/2; the combustion chamber end of this resistor 46 is connected to the second electrode 35 of the spark gap 33 via an electrical connector 50 which runs at the combustion chamber end of the electrical insulator insert 17/2.
  • the connectors 48 and 49 are preferably embedded in an electrically insulating material which is connected to the dielectric 38 of the capacitor 37.
  • An additional capacitor 51 is formed from a metal tube representing the first charge carrier 52, which is arranged on the outer surface of the electrical insulating body base 17/3 and is covered by a thin-layer dielectric 53 made of a known material (for example aluminum oxide), and the one acting as a second charge carrier Metal housing 11.
  • the first charge carrier of this capacitor 51 is also electrically connected to the connecting bolt 27 at its connection-side end via a section 47 'of the connector 47.
  • FIG. 2 shows the equivalent circuit diagram of the spark plug according to the invention; the reference symbols used therein correspond to the respective components of the spark plug 10 according to FIG. 1.
  • the connecting bolt 27 is provided for connection to the secondary winding of an ignition coil, not shown.
  • a first line branch extends from this connecting bolt 27, which leads first to the ground-forming housing 11 via the spark gap 33, then via the capacitor 37 and finally via the spark gap 32 formed between the central electrode 40 and the ground electrode 15.
  • a high-resistance resistor 46 is located in the bypass to the aforementioned capacitor 37 and to the spark gap 42.
  • the other high-resistance resistor 45 is arranged in a shunt to the spark gap 33 and the capacitor 37.
  • Another circuit branch branches off from the connecting bolt 27 and contains the capacitor 51, the second charge carrier of which is formed by the housing 11 which is connected to ground.
  • spark gap 33 spark gap 33, resistors 45 and 46, capacitors 37 and 51

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Zündkerze nach der Gattung des Hauptanspruchs; bekannt ist schon eine Zündkerze (DE-OS 23 63 804, DE-AS 28 10159), bei der in unmittelbarer Nähe der Zündelektroden mittels eines Kondensators und einer Vorfunkenstrecke elektrische Energie in einer Menge zwischengespeichert wird, die in der Durchbruchsphase des Zündfunkens einen gegenüber herkömmlichen Zündkerzen erhöhten Energieumsatz bewirkt.The invention relates to a spark plug according to the preamble of the main claim; A spark plug is already known (DE-OS 23 63 804, DE-AS 28 10159), in which in the immediate vicinity of the ignition electrodes by means of a capacitor and a spark gap, electrical energy is temporarily stored in an amount which, in the breakdown phase of the ignition spark, is more than conventional Spark plugs causes increased energy turnover.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Zündkerze mit den kennzeichnenden Merkmalen der Hauptanspruche hat demgegenüber den Vorteil, daß sie zusätzlich zu dem erhöhten Energieumsatz in der Durchbruchsphase des Zündfunkens auch noch über ein erhöhtes Spannungsangebot verfügt, und zwar unter Zugrundelegung einer unveränderten Eingangsspannung zur Zündkerze.The spark plug according to the invention with the characterizing features of the main claims has the advantage that, in addition to the increased energy consumption in the breakdown phase of the ignition spark, it also has an increased voltage supply, on the basis of an unchanged input voltage to the spark plug.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Zündkerze möglich; besonders vorteilhaft ist es, daß die für die Erfindung zusätzlich erforderlichen Bauelemente alle oder zumindest zum Teil innerhalb der Zündkerze integriert werden können.The measures listed in the subclaims enable advantageous developments and improvements of the spark plug specified in the main claim; It is particularly advantageous that all or at least some of the components additionally required for the invention can be integrated within the spark plug.

Zeichnungdrawing

Die Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 den schematischen Aufbau einer erfindungsgemäßen Zündkerze in unmaßstäblicher Darstellung und Figur 2 das Ersatzschaltbild einer solchen Zündkerze.The invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows the schematic structure of a spark plug according to the invention in an unscaled representation, and FIG. 2 shows the equivalent circuit diagram of such a spark plug.

Beschreibung der ErfindungDescription of the invention

Die in der Figur 1 dargestellte Hochspannungszündkerze 10 besitzt ein im wesentlichen rohrförmiges Metallgehäuse 11, das an seiner Außenseite ein Einschraubgewinde 12, ein Schlüsselsechskant 13 und einen Dichtsitz 14 als Mittel für den Einbau der Zündkerze 10 in einen nicht dargestellten Motorkopf aufweist; im Bereich seines brennraumseitigen Endes hat dieses Metallgehäuse 11 eine hakenförmige Masselektrode 15, welche im vorliegenden Beispiel als angeschweißter Draht ausgebildet ist, jedoch auch von anderer Konfiguration sein kann. Das Metallgehäuse 11 umfaßt in seiner Durchgangsbohrung 16 in bekannter Weise einen rotationssymmetrischen Elektroisolierkörper 17, der zumindest anschlußseits aus der Durchgangsbohrung 16 des Metallgehäuses 11 herausragt. Dieser Elektroisolierkörper 17, der beispielsweise im wesentlichen aus Aluminiumoxid besteht, setzt sich im vorliegenden Beispiel aus drei Teilen zusammen, und zwar aus dem anschlußseitigen Kopf 17/1, einem Einsatz 17/2 und einem brennraumseitigen Fuß 17/3. Die brennraumseitigeStirnfläche 18 des Elektroisolierkörper-Fußes 17/3 liegt auf einer brennraumseits in der Durchgangsbohrung 16 des Metallgehäuses angeformten Schulter 19 auf und ist in der Durchgangsbohrung 16 seitlich fixiert. Im anschlußseitigen Endabschnitt des Elektroisolierkörper-Fußes 17/3 ist eine Vertiefung 20 eingeformt, in welcher der Elektroisolierkörper-Einsatz 17/2 fixiert und festgelegt ist. Diese Vertiefung 20 im Elektroisolierkörper-Fuß 17/3 setzt sich brennraumseits in einer Längsbohrung 21/3 mit einer in der Nähe des brennraumseitigen Endabschnitts befindlichen Schulter 22 fort; diese Längsbohrung 21/3 tritt brennraumseits aus der Stirnfläche 18 des Elektroisolierkörper-Fußes 17/3 aus und setzt sich anschlußseits im Elektroisolierkörper-Einsatz 17/2 als Längsbohrung 21/2 fort. Diese Längsbohrung 21/3 und 21/2 setzen sich noch weiter fort in einer Längsbohrung 21/1, welche den Elektroisolierkörper-Kopf 17/1 axial durchläuft. Dieser Elektroisolierkörper-Kopf 17/1 hat brennraumseits einen Flansch 23, auf dessen anschlußseitiger Schräge 24 sich ein Bördelrand 25 des anschlußseitigen Endabschnitts om Metallgehäuse 11 auflegt und den mehrteiligen Elektroisolierkörper 17 fest zusammenhält. Auf die Darstellung von an sich bekannten Dichtmitteln und Ausgleichselementen für das unterschiedliche Ausdehnungsverhalten der verschiedenen Bauteile dieser Zündkerze 10 wurde verzichtet. Auf der Außenseite des Elektroisolierkörper-Kopfes 17/1 sind in bekannter Weise eine Anzahl von Nuten 26 eingeformt, die als Kriechstrombarriere dienen.The high-voltage spark plug 10 shown in FIG. 1 has an essentially tubular metal housing 11 which has on its outside a screw thread 12, a hexagon key 13 and a sealing seat 14 as a means for installing the spark plug 10 in an engine head (not shown); In the area of its end on the combustion chamber side, this metal housing 11 has a hook-shaped ground electrode 15, which in the present example is designed as a welded-on wire, but can also be of a different configuration. The metal housing 11 comprises in its through bore 16 in a known manner a rotationally symmetrical electrical insulating body 17 which projects at least on the connection side out of the through bore 16 of the metal housing 11. This electrical insulating body 17, which for example essentially consists of aluminum oxide, is composed in the present example of three parts, namely the connection-side head 17/1, an insert 17/2 and a combustion chamber-side foot 17/3. The combustion chamber-side end face 18 of the electrical insulator base 17/3 rests on a shoulder 19 formed on the combustion chamber side in the through bore 16 of the metal housing and is laterally fixed in the through bore 16. A recess 20 is formed in the connection-side end section of the electrical insulating body base 17/3, in which the electrical insulating body insert 17/2 is fixed and fixed. This depression 20 in the electrical insulating body foot 17/3 continues on the combustion chamber side in a longitudinal bore 21/3 with a shoulder 22 located near the end section on the combustion chamber side; this longitudinal bore 21/3 emerges on the combustion chamber side from the end face 18 of the electrical insulator base 17/3 and continues on the connection side in the electrical insulator insert 17/2 as a longitudinal bore 21/2. This longitudinal bore 21/3 and 21/2 continue even further in a longitudinal bore 21/1, which axially passes through the electrical insulator head 17/1. This Elektroisolierkörper-head 17/1 has a flange 23 on the combustion chamber side, on the connection-side bevel 24 a flanged edge 25 of the connection-side end portion om metal housing 11 and holds the multi-part electrical insulation body 17 together. The representation of sealing means and compensating elements known per se for the different expansion behavior of the different components of this spark plug 10 has been omitted. On the outside of the electrical insulating body head 17/1 a number of grooves 26 are formed in a known manner, which serve as a leakage current barrier.

Durch die Längsbohrung 21/1 des Elektroisolierkörper-Kopfes 17/1 führt ein elektrisch leitender Anschlußbolzen 27, der an seinem anschlußseitigen, aus dem Elektroisolierkörper-Kopf 17/1 herausragenden Endabschnitt ein Gewinde 28 und einen Bund 29 hat, mit dem er sich an der anschlußseitigen Stirnfläche 30 des Elektroisolierkörper-Kopfes 17/1 abstützt. Der brennraumseitige Endabschnitt dieees Anschlußbolzens 27 endet etwa mit der brennraumseitigen Stirnfläche 31 des Elektroisolierkörper-Kopfes 17/1 und setzt sich in einer ersten Elektrode 32 einer Vorfunkenstrecke 33 fort. Diese Vorfunkenstrecke 33, die an sich bekannt ist und bevorzugt in einer Kapsel 34 eingeschlossen ist, ist in der Längsbohrung 21/2 des Elektroisolierkörper-Einsatzes 17/2 angeordnet und hat eine zweite Elektrode 35, welche brennraumseits aus der Kapsel 34 der Vorfunkenstrecke 33 austritt.Through the longitudinal bore 21/1 of the electrical insulating body head 17/1 leads an electrically conductive connecting bolt 27, which has a thread 28 and a collar 29 on its connection-side end section projecting from the electrical insulating body head 17/1, with which it attaches itself to the supports end face 30 of the electrical insulating body head 17/1. The combustion chamber-side end section of the connecting bolt 27 ends approximately with the combustion chamber-side end face 31 of the electrical insulator head 17/1 and continues in a first electrode 32 of a spark gap 33. This spark gap 33, which is known per se and is preferably enclosed in a capsule 34, is arranged in the longitudinal bore 21/2 of the electrical insulator insert 17/2 and has a second electrode 35, which emerges from the capsule 34 of the spark gap 33 on the combustion chamber side.

Die zweite Elektrode 35 der Vorfunkenstrecke 33 setzt sich in einem Teil der Längsbohrung 21/3 des Elektroisolierkörper-Fußes 17/3 fort und stellt mit einem erheblichen Teil seines brennraumseitigen Endabschnitts einen ersten Ladungsträger 36 eines Kondensators 37 dar; als Dielektrikum 38 dient z. B. eine Schicht aus Aluminiumoxid, welche auf diesem ersten Ladungsträger 36 aufgebracht ist. Der zweite Ladungsträger 39 dieses Kondensators 37 wird von einem metallischen Rohr gebildet, welches auf dem schichtförmigen Dielektrikum 38 aufliegt, an seinem brennraumseitigen Ende geschlossen ist und als Mittelelektrode 40 brennraumseits aus der Längsbohrung 21/3 des Elektroisolierkörper-Fußes 17/3 heraustritt. Diese Mittelelektrode 40 weist an ihrer Außenseite einen Absatz 41 auf, mit der sie sich auf der Schulter 22 in der Längsbohrung 21/3 des Isolierkörper-Fußes 17/3 abstützt. Der zwischen der Mittelelektrode 40 und der Masseelektrode 15 vorhandene Spalt bildet die Funkenstrecke 42.The second electrode 35 of the spark gap 33 continues in part of the longitudinal bore 21/3 of the electrical insulator base 17/3 and, with a considerable part of its end section on the combustion chamber side, represents a first charge carrier 36 of a capacitor 37; z serves as dielectric. B. a layer of aluminum oxide, which is applied to this first charge carrier 36. The second charge carrier 39 of this capacitor 37 is formed by a metallic tube which rests on the layer-shaped dielectric 38, is closed at its end on the combustion chamber side and emerges as the central electrode 40 from the longitudinal bore 21/3 of the electrical insulating body base 17/3 on the combustion chamber side. This center electrode 40 has on its outside a shoulder 41 with which it is supported on the shoulder 22 in the longitudinal bore 21/3 of the insulator base 17/3. The gap between the center electrode 40 and the ground electrode 15 forms the spark gap 42.

Im Elektroisolierkörper-Einsatz 17/2 sind neben der Längsbohrung 21/2 zwei weitere Längsbohrungen 43 und 44 mit eingeformt: In diesen Längsbohrungen 43 und 44 befindet sich jeweils ein hochohmiger Widerstand 45 bzw. 46. Der Widerstand 45 ist anschlußseits mit dem Anschlußbolzen 27 über einen elektrischen Verbinder 47 verbunden, welcher zwischen der brennraumseitigen Stirnfläche 31 des Elektroisolierkörper-Kopfes 17/1 und dem Elektroisolierkörper-Einsatz 17/2 angeordnet ist; das brennraumseitige Ende dieses Widerstandes 45 ist mit dem zweiten Ladungsträger 39 des Kondensators 37 über einen Verbinder 48 verbunden, der am brennraumseitigen Ende des Elektroisolierkörper-Einsatzes 17/2 verläuft. Der andere hochohmige Widerstand 46 ist anschlußseits mit dem Metallgehäuse 11 über einen Verbinder 49 verbunden, welcher zwischen der brennraumseitigen Stirnfläche 31 des Elektroisolierkörper-Kopfes 17/1 und dem Elektroisolierkörper-Einsatz 17/2 verläuft; das brennraumseitige Ende dieses Widerstandes 46 ist mit der zweiten Elektrode 35 der Vorfunkenstrecke 33 über einen elektrischen Verbinder 50 verbunden, welcher am brennraumseitigen Ende des Elektroisolierkörper-Einsatzes 17/2 verläuft. Die Verbinder 48 und 49 sind bevorzugt in einem elektrisch isolierendem Material eingebettet, welches mit dem Dielektrikum 38 des Kondensators 37 verbunden ist.In addition to the longitudinal bore 21/2, two further longitudinal bores 43 and 44 are also formed in the electrical insulator insert 17/2: in each of these longitudinal bores 43 and 44 there is a high-resistance resistor 45 or 46. The resistor 45 is connected on the connection side with the connecting bolt 27 an electrical connector 47 is connected, which is arranged between the combustion chamber-side end face 31 of the electrical insulating body head 17/1 and the electrical insulating body insert 17/2; the combustion chamber end of this resistor 45 is connected to the second charge carrier 39 of the capacitor 37 via a connector 48 which runs at the combustion chamber end of the electrical insulator insert 17/2. The other high-resistance resistor 46 is connected on the connection side to the metal housing 11 via a connector 49 which runs between the combustion-chamber-side end face 31 of the electrical insulating body head 17/1 and the electrical insulating body insert 17/2; the combustion chamber end of this resistor 46 is connected to the second electrode 35 of the spark gap 33 via an electrical connector 50 which runs at the combustion chamber end of the electrical insulator insert 17/2. The connectors 48 and 49 are preferably embedded in an electrically insulating material which is connected to the dielectric 38 of the capacitor 37.

Ein zusätzlicher Kondensator 51 wird gebildet aus einem den ersten Ladungsträger 52 darstellenden Metallrohr, welches auf der Mantelfläche des Elektroisolierkorper-Fußes 17/3 angeordnet und mittels eines dünnschichtigen Dielektrikums 53 aus einem bekannten Stoff (z.B. Aluminiumoxid) abgedeckt ist, und dem als zweiten Ladungsträger wirkenden Metallgehäuse 11. Der erste Ladungsträger dieses Kondensators 51 ist an seinem anschlußseitigen Ende über einen Abschnitt 47' des Verbinders 47 ebenfalls mit dem Anschlußbolzen 27 elektrisch verbunden.An additional capacitor 51 is formed from a metal tube representing the first charge carrier 52, which is arranged on the outer surface of the electrical insulating body base 17/3 and is covered by a thin-layer dielectric 53 made of a known material (for example aluminum oxide), and the one acting as a second charge carrier Metal housing 11. The first charge carrier of this capacitor 51 is also electrically connected to the connecting bolt 27 at its connection-side end via a section 47 'of the connector 47.

In der Figur 2 ist das Ersatzschaltbild der erfindungsgemäßen Zündkerze dargestellt; die darin verwendeten Bezugszeichen entsprechen den jeweiligen Bauelementen der Zündkerze 10 nach Figur 1.FIG. 2 shows the equivalent circuit diagram of the spark plug according to the invention; the reference symbols used therein correspond to the respective components of the spark plug 10 according to FIG. 1.

Der Anschlußbolzen 27 ist für den Anschluß an die Sekundärwicklung einer nicht dargestellten Zündspule vorgesehen. Von diesem Anschlußbolzen 27 geht ein erster Leitungszweig aus, welcher zunächst über die Vorfunkenstrecke 33, dann über den Kondensator 37 und schließlich über die zwischen Mittelelektrode 40 und Masseelektrode 15 gebildete Funkenstrecke 32 zu dem massebildenden Gehäuse 11 führt. Im Nebenschluß zum vorstehend genannten Kondensator 37 und zur Funkenstrecke 42 liegt ein hochohmiger Widerstand 46.The connecting bolt 27 is provided for connection to the secondary winding of an ignition coil, not shown. A first line branch extends from this connecting bolt 27, which leads first to the ground-forming housing 11 via the spark gap 33, then via the capacitor 37 and finally via the spark gap 32 formed between the central electrode 40 and the ground electrode 15. A high-resistance resistor 46 is located in the bypass to the aforementioned capacitor 37 and to the spark gap 42.

In einem Nebenschluß zur Vorfunkenstrecke 33 und dem Kondensator 37 ist der andere hochohmige Widerstand 45 angeordnet. Von dem Anschlußbolzen 27 zweigt noch ein weiterer Schaltungszweig ab, welcher den Kondensator 51 enthält, dessen zweiter Ladungsträger von dem an Masse liegendem Gehäuse 11 gebildet wird.The other high-resistance resistor 45 is arranged in a shunt to the spark gap 33 and the capacitor 37. Another circuit branch branches off from the connecting bolt 27 and contains the capacitor 51, the second charge carrier of which is formed by the housing 11 which is connected to ground.

Die vorstehend beschriebene Schaltungsanordnung hat folgende Wirkungsweise:

  • Wird über den Anschlußbolzen 27 eine Spannung zugeführt, so ergibt sich eine Aufladung der Kondensatoren 37 und 51. Die Aufladung des Kondensators 51 erfolgt unmittelbar nach Anlegen der Spannung, wogegen die Aufladung des Kondensators 37 über die jetzt in Serie liegenden, hochohmigen Widerstände 45 und 46 erfolgt. Wenn schließlich die Spannung am Kondensator 51 soweit angestiegen ist, so daß die Spannung an der Vorfunkenstrecke 33 durchbricht, dann kommt an der Funkenstrecke 42 die Summe der an den Kondensatoren 51 und 37 liegenden Spannungen zur Wirkung und sorgt hier für einen sicheren Funkenüberschlag.
The circuit arrangement described above has the following mode of operation:
  • If a voltage is supplied via the connecting bolt 27, the capacitors 37 and 51 are charged. The capacitor 51 is charged immediately after the voltage is applied, whereas the capacitor 37 is charged via the high-resistance resistors 45 and 46 now in series he follows. When the voltage across the capacitor 51 has finally risen so far that the voltage across the spark gap 33 breaks through, the sum of the voltages across the capacitors 51 and 37 comes into effect at the spark gap 42 and ensures a safe sparkover.

Es sei vermerkt, daß einzelne der in der Zündkerze 10 befindliche Bauelemente (Vorfunkenstrecke 33, Widerstände 45 und 46, Kondensatoren 37 und 51) auch außerhalb, aber nahe der Zündkerze 10 (z.B. im nicht dargestellten Anschlußstecker) angebracht sein können; die Unterbringung der Vorfunkenstrecke 33, ggf. auch mindestens einer der rohrförmigen, bevorzugt koaxial zur Mittelelektrode 40 angeordneten Kondensatoren 37 oder 51 bietet sich jedoch günstig an.It should be noted that some of the components in spark plug 10 (spark gap 33, resistors 45 and 46, capacitors 37 and 51) can also be fitted outside but close to spark plug 10 (e.g. in the connector (not shown)); however, the accommodation of the spark gap 33, possibly also at least one of the tubular capacitors 37 or 51, which are preferably arranged coaxially to the central electrode 40, is advantageous.

Claims (5)

1. Spark plug (10) for internal combustion engines, having an electrically earthed shell (11), an electrical insulator (17), which is arranged and seal-fitted in the through-bore of this metal shell, a centre electrode (40), which is seal-fitted in the longitudinal bore of the electrical insulator and, on the combustion chamber side, is opposite and away from a second electrode (15), serving as earth electrode, in such a way that a spark gap (42) is formed, and, on the terminal side, is connected via an auxiliary spark gap (33) to a terminal bolt (27), likewise surrounded by the electrical insulator, and having a capacitor (51), which is connected in parallel to that branch which contains the terminal bolt, the auxiliary spark gap, the centre electrode, the spark gap and the second electrode, characterized in that there is an additional capacitor (37) between auxiliary spark gap (33) and spark gap (42), in that furthermore a high-valued resistor (45) is connected in parallel to the auxiliary spark gap (33) and the additional capacitor (37) in series with it, and in that another additional high-valued resistor (46) is connected in parallel to the additional capacitor (37) and the spark gap (42) in series with it.
2. Spark plug according to Claim 1, characterized in that the auxiliary spark gap (33) forms a compact component with the spark plug (10).
3. Spark plug according to Claim 1 or 2, characterized in that at least one of the capacitors (37, 51) is formed from tubular structural elements which are preferably arranged coaxial to the centre electrode (40).
4. Spark plug according to Claim 1 or 2, characterized in that the auxiliary spark gap (33), the two resistors (45, 46) and the two capacitors (37,51) form a compact component with the spark plug (10).
5. Spark plug according to one of Claims 3 or 4, characterized in that the metal shell (11) forms a charge of a capacitor (51) serving as charge store.
EP84101508A 1983-03-10 1984-02-14 Sparking plugs for internal-combustion engines Expired EP0118789B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3308522 1983-03-10
DE19833308522 DE3308522A1 (en) 1983-03-10 1983-03-10 SPARK PLUG FOR INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0118789A1 EP0118789A1 (en) 1984-09-19
EP0118789B1 true EP0118789B1 (en) 1987-01-14

Family

ID=6193081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101508A Expired EP0118789B1 (en) 1983-03-10 1984-02-14 Sparking plugs for internal-combustion engines

Country Status (4)

Country Link
US (1) US4549114A (en)
EP (1) EP0118789B1 (en)
JP (1) JPS59169088A (en)
DE (2) DE3308522A1 (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338672C1 (en) * 1983-10-25 1985-03-28 Daimler-Benz Ag, 7000 Stuttgart Device for igniting combustible mixtures
DE3347027A1 (en) * 1983-12-24 1985-07-04 Robert Bosch Gmbh, 7000 Stuttgart SPARK PLUG FOR AN INTERNAL COMBUSTION ENGINE
CA1267930A (en) * 1984-02-27 1990-04-17 Ronald C. Pate Combustion initiation system employing hard discharge ignition
DE3436628A1 (en) * 1984-10-05 1986-04-10 BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg Spark plug
DE3600511A1 (en) * 1985-05-31 1986-12-04 Robert Bosch Gmbh, 7000 Stuttgart SPARK PLUG FOR INTERNAL COMBUSTION ENGINES
DE3603025A1 (en) * 1986-01-31 1987-08-06 Isotec Ag INTERMEDIATE UNIT FOR A IGNITION SYSTEM
JPH071711B2 (en) * 1986-11-26 1995-01-11 日本電装株式会社 Spark plug for internal combustion engine
JPH0831352B2 (en) * 1987-08-04 1996-03-27 株式会社日本自動車部品総合研究所 Spark plug
US5210458A (en) * 1989-03-06 1993-05-11 Mcdougal John A Spark plug
JPH0494076A (en) * 1990-08-09 1992-03-26 Yazaki Corp Discharging tube-built in type spark plug apparatus
JPH04203269A (en) * 1990-11-29 1992-07-23 Yazaki Corp High voltage cable device
US6559376B2 (en) 1996-09-30 2003-05-06 Nology Engineering, Inc. Combustion initiation device and method for tuning a combustion initiation device
US6329743B1 (en) * 1999-08-17 2001-12-11 Louis S. Camilli Current peaking sparkplug
US6374816B1 (en) 2001-04-23 2002-04-23 Omnitek Engineering Corporation Apparatus and method for combustion initiation
US7036494B1 (en) * 2005-10-21 2006-05-02 Chih-Yu Hsieh Ignition enhancement device for enhancing ignition efficiency of car engine
US8922102B2 (en) * 2006-05-12 2014-12-30 Enerpulse, Inc. Composite spark plug
US8049399B2 (en) 2006-07-21 2011-11-01 Enerpulse, Inc. High power discharge fuel ignitor
US7517235B2 (en) 2006-12-28 2009-04-14 General Electric Company Press fit connection for mounting electrical plug-in outlet insulator to a busway aluminum housing
US7735460B2 (en) * 2008-02-01 2010-06-15 Leonard Bloom Method and apparatus for operating standard gasoline-driven engines with a readily-available non-volatile fuel, thereby obviating the use of gasoline
US8015670B2 (en) * 2008-02-19 2011-09-13 Stover Equipment Co. Inc. Module feeder with non-traveling unwrapper
JP5696837B2 (en) * 2008-02-22 2015-04-08 エールリッヒ，メルヴィン Plasma plug for internal combustion engine
DE102011117600A1 (en) * 2011-11-04 2013-05-08 Andreas Stihl Ag & Co. Kg Ignition device for a two-stroke engine
EP2807711A4 (en) 2012-01-27 2015-10-07 Enerpulse Inc High power semi-surface gap plug
EP2839556A1 (en) 2012-05-30 2015-02-25 Siemens Aktiengesellschaft Spark gap with a capacitive energy accumulator
US9828967B2 (en) 2015-06-05 2017-11-28 Ming Zheng System and method for elastic breakdown ignition via multipole high frequency discharge
JP6359575B2 (en) * 2016-02-15 2018-07-18 日本特殊陶業株式会社 Spark plug
BR112019019451A2 (en) * 2017-03-27 2020-04-14 V Monros Serge spark plug cable, and plasma spark plug
JP7125289B2 (en) * 2018-06-29 2022-08-24 株式会社Soken Ignition device for internal combustion engine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376362A (en) * 1945-05-22 Ignition system
US1982950A (en) * 1933-01-23 1934-12-04 Helen Baus Curtis Spark intensifying device
FR1326756A (en) * 1962-05-21 1963-05-10 Lodge Plugs Ltd Improvements to ignition devices, in particular spark plugs
GB994525A (en) * 1962-12-06 1965-06-10 Gen Motors Ltd Spark plugs
FR1376204A (en) * 1963-12-03 1964-10-23 Gen Motors Ltd Spark plug
US3353052A (en) * 1964-07-15 1967-11-14 George H Barry Spark plug having an auxiliary series spark gap in parallel with the main spark gap
DE2363804A1 (en) * 1973-12-21 1975-06-26 Uwe Holtin Sparking plug with integrated capacitor - has dielectric material and electrode elements arranged to form parallel capacitors
US4020388A (en) * 1974-09-23 1977-04-26 Massachusetts Institute Of Technology Discharge device
DE2739413A1 (en) * 1977-09-01 1979-03-08 Daimler Benz Ag SPARK PLUG
DE2810159C3 (en) * 1978-03-09 1984-11-08 Bloss, Werner H., Prof. Dr.-Ing., 7065 Winterbach Device for igniting combustible mixtures

Also Published As

Publication number Publication date
EP0118789A1 (en) 1984-09-19
US4549114A (en) 1985-10-22
DE3462083D1 (en) 1987-02-19
DE3308522A1 (en) 1984-09-13
JPS59169088A (en) 1984-09-22

Similar Documents

Publication Publication Date Title
EP0118789B1 (en) Sparking plugs for internal-combustion engines
EP1053399B1 (en) Ignition device for a high-frequency ignition
DE3878336T2 (en) SPARK PLUG.
EP0238520B1 (en) Surface-discharge spark plug
DE69423322T2 (en) Device for detecting misfire in an internal combustion engine equipped with a double-ended coil and a distributorless ignition system
DE2436698B2 (en) Circuit arrangement for an ignition device of an internal combustion engine
EP0049372B1 (en) Spark plug for internal-combustion engines
DE3108635A1 (en) DISTRIBUTOR-FREE IGNITION SYSTEM WITH OVERVOLTAGE ABSORBER AND DEVICE EQUIPPED WITH IT
DE102016006350A1 (en) Spark plug for a high-frequency ignition system
DE4132285A1 (en) SPARK PLUG FOR AN INTERNAL COMBUSTION ENGINE EQUIPPED WITH AN IONIZATION CURRENT DETECTOR ELECTRODE
DE2654092A1 (en) SPARK PLUG
EP0147613A2 (en) Sparking plug for an internal-combustion engine
DE69033373T2 (en) Discharge device and ignition arrangement with a series spark gap using the discharge device
DE1902199C3 (en) Spark plug connector
DE19711876A1 (en) High power spark ignition system for IC engine
DE2949573A1 (en) IGNITION DISTRIBUTOR
DE2739413A1 (en) SPARK PLUG
DE102005043318A1 (en) Arrangement for high-voltage side detection of a measurement signal, in particular a signal corresponding to the ion current between the electrodes of a spark plug of an internal combustion engine
DE3728161A1 (en) Spark plug with multiple ignition
DE3505988A1 (en) Ignition device intended for an internal-combustion engine
EP0591686B1 (en) Connecting element for ignition device
DE3588119T2 (en) Device for igniting the combustion of a fuel-air mixture
DE4204731C2 (en) Ignition device for internal combustion engines
EP0304037B1 (en) Ignition system for combustion engines
EP1094575B1 (en) Spark plug

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840214

AK Designated contracting states

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19860402

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 3462083

Country of ref document: DE

Date of ref document: 19870219

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19890214

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19891027

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19891101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST