EP0249241A1 - Sparking plug for internal-combustion engines - Google Patents

Sparking plug for internal-combustion engines Download PDF

Info

Publication number
EP0249241A1
EP0249241A1 EP87108504A EP87108504A EP0249241A1 EP 0249241 A1 EP0249241 A1 EP 0249241A1 EP 87108504 A EP87108504 A EP 87108504A EP 87108504 A EP87108504 A EP 87108504A EP 0249241 A1 EP0249241 A1 EP 0249241A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
electrode
ground electrode
spark
webs
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.)
Ceased
Application number
EP87108504A
Other languages
German (de)
French (fr)
Inventor
Josef Holzmann
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0249241A1 publication Critical patent/EP0249241A1/en
Ceased 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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
    • 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
    • H01T13/467—Sparking plugs having two or more spark gaps in parallel connection

Definitions

  • the invention relates to a spark plug according to the preamble of patent claim 1.
  • Conventional spark plugs have a ground electrode, which is attached to the side and overlaps the center electrode with its free end.
  • ring-shaped ground electrodes which are arranged concentrically with the center electrode. Examples of this can be found in DE-3441997 A1 and DE-2444454 A1.
  • the ground electrode is either set back at the level of the central electrode or set back in the axial direction.
  • an insulating body is provided between the center and ground electrodes, on the surface of which the ignition spark runs.
  • the arrangement of the spark plug or the course of the spark in relation to the combustion chamber is unfavorable.
  • there is a one-sided edge of the center electrode with the result that the ignition spark sits more unfavorably with respect to the combustion chamber as the operating time increases.
  • the invention has for its object to provide a spark plug of the type mentioned, which also has a uniform wear pattern on the center electrode with prolonged use and a good position of the spark in relation to the combustion chamber. Furthermore, especially at low loads and in the partial load range, the combustion process and thus the exhaust gas are influenced favorably.
  • the position of the spark corresponds approximately to the position that it has in the conventional spark plug mentioned at the beginning.
  • the ring-shaped design of the ground electrode also ensures a uniform wear pattern.
  • the spark plug according to the invention thus combines the advantages of known spark plugs without having their disadvantages.
  • the measure according to claim 2 is advantageous insofar as it enables the free choice of the relative arrangement of the ground and center electrodes. Depending on the type of internal combustion engine, the axial distance between the ground and center electrodes can be set individually.
  • the free-standing arrangement (caused by the webs) and the plate-shaped action of the ring-shaped ground electrode leads to the formation of a calm flow of the mixture between this electrode and the center electrode, with the result of complete ignition and combustion of the mixture. This results in optimal power delivery with complete combustion in every load range.
  • the HC value of the exhaust gases is low.
  • the arrangement of the ground electrode caused by the webs is also distinguished by special mechanical stability even during prolonged operation and enables the spark plugs to be used even in mechanically highly stressed internal combustion engines. Examples of these are usually 4-valve engines.
  • the spark plug 1 according to the invention is in its upper part leading to the ignition cable, not shown, of the usual design.
  • a connection contact part 2 an insulating body 3 and a hexagonal shaft 4.
  • a center electrode 5 and an annular ground electrode 6 are arranged centrally.
  • the inside diameter of the ground electrode 6 is larger than the outside diameter of the center electrode 5.
  • the ground electrode is kept largely exposed by three webs 7, which run parallel to the longitudinal axis of the spark plug 1.
  • lugs 8 projecting radially from the ground electrode 6 rest on the end faces of the webs.
  • the ignition spark can be positioned in the desired position with respect to the combustion chamber.
  • the ring-shaped design of the ground electrode also ensures uniform erosion of the center electrode, since the ignition spark originates from different locations of the center electrode under different operating conditions of the internal combustion engine.
  • the free-standing ground electrode acts as a guide body for a part of the mixture, which is thereby introduced in the form of a calm, even flow into the spark gap between the two electrodes 5 and 6, where it is completely ignited and in the further course the remaining mixture is also completely in accordance with Art an initial spark ignited. This is done without temporal losses caused by unintended turbulence. The mixture is thus completely burned and leaves the internal combustion engine with the lowest possible proportion of unburned hydrocarbons.

Landscapes

  • Spark Plugs (AREA)

Abstract

In a spark plug for internal combustion engines an annular earthing electrode is located concentrically to a centrally-situated centre electrode. The relative position of the earthing and centre electrode is selected in such a way that the earthing electrode is arranged to project axially in front of the centre electrode.

Description

Die Erfindung bezieht sich auf eine Zündkerze nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a spark plug according to the preamble of patent claim 1.

Herkömmliche Zündkerzen besitzen eine Masseelektrode, die seitlich angesetzt ist und mit ihrem freien Ende die Mittelelektrode übergreift. Daneben ist bekannt, ringförmige Masseelektroden vorzusehen, die konzentrisch zur Mittelelektrode angeordnet sind. Beispiele hierfür finden sich in der DE-3441997 A1 sowie der DE-2444454 A1. Bei diesen Zündkerzen ist die Masselektrode entweder auf Höhe der Mittelelektrode oder in axialer Richtung zurückgesetzt angeordnet. Bei letzterer Anordnung ist dabei zwischen Mittel- und Masseelektrode ein Isolierkörper vorgesehen, an dessen Oberfläche der Zündfunken entlangläuft. In beiden Fällen ist die Anordnung der Zündkerze bzw. der Verlauf des Zündfunkens im Bezug auf den Brennraum ungünstig. Bei den eingangs genannten konventionellen Zündkerzen liegt ein einseitiger Abrand der Mittelelektrode vor mit der Folge, daß mit zunehmender Betriebsdauer der Zündfunke bezüglich des Brennraums ungünstiger sitzt.Conventional spark plugs have a ground electrode, which is attached to the side and overlaps the center electrode with its free end. In addition, it is known to provide ring-shaped ground electrodes which are arranged concentrically with the center electrode. Examples of this can be found in DE-3441997 A1 and DE-2444454 A1. With these spark plugs, the ground electrode is either set back at the level of the central electrode or set back in the axial direction. In the latter arrangement, an insulating body is provided between the center and ground electrodes, on the surface of which the ignition spark runs. In both cases, the arrangement of the spark plug or the course of the spark in relation to the combustion chamber is unfavorable. In the conventional spark plugs mentioned at the outset, there is a one-sided edge of the center electrode, with the result that the ignition spark sits more unfavorably with respect to the combustion chamber as the operating time increases.

Der Erfindung liegt die Aufgabe zugrunde, eine Zündkerze der eingangs genannten Art zu schaffen, die ein gleichmäßiges Verschleißbild an der Mittelelektrode auch bei längerem Gebrauch und eine gute Lage des Zündfunkens in Bezug auf den Brennraum, besitzt. Desweiteren wird gerade bei geringen Lasten und im Teillastbereich der Brennverlauf und somit das Abgas günstig beeinflußt.The invention has for its object to provide a spark plug of the type mentioned, which also has a uniform wear pattern on the center electrode with prolonged use and a good position of the spark in relation to the combustion chamber. Furthermore, especially at low loads and in the partial load range, the combustion process and thus the exhaust gas are influenced favorably.

Die Erfindung löst diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspruchs 1.The invention solves this problem by the characterizing features of patent claim 1.

Durch den radialen Abstand entspricht die Lage des Zündfunkens in etwa der Lage, die er bei der eingangs genannten konventionellen Zündkerze besitzt. Durch die ringförmige Ausbildung der Masseelektrode ist darüber hinaus ein gleichmäßiges Verschleißbild gewährleistet. Die erfindungsgemäße Zündkerze vereinigt somit die Vorteile bekannter Zündkerzen, ohne deren Nachteile aufzuweisen.Due to the radial distance, the position of the spark corresponds approximately to the position that it has in the conventional spark plug mentioned at the beginning. The ring-shaped design of the ground electrode also ensures a uniform wear pattern. The spark plug according to the invention thus combines the advantages of known spark plugs without having their disadvantages.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den weiteren Patentansprüchen. Dabei ist die Maßnahme nach Patentanspruch 2 insoweit vorteilhaft, als sie die Möglichkeit einer freien Wahl der relativen Anordnung von Masse- und Mittelelektrode ermöglicht. Je nach Typ der Brennkraftmaschine kann der axiale Abstand zwischen Masse- und Mittelelektrode individuell eingestellt werden.Advantageous refinements of the invention result from the further patent claims. The measure according to claim 2 is advantageous insofar as it enables the free choice of the relative arrangement of the ground and center electrodes. Depending on the type of internal combustion engine, the axial distance between the ground and center electrodes can be set individually.

Die konstruktiven Merkmale nach den Patentansprüchen 3 und 4 ermöglichen eine konstruktiv besonders einfache Realisierung der Erfindung. Damit ist es beispielsweise möglich, bereits vor Serienfertigung der Zündkerze aus der eingangs genannten konventionellen Zündkerze durch die Anordnung der Stege und der Masseelektrode ein Prüfmuster für die erfindungsgemäße Zündkerze herzustellen. Einer dieser Stege kann durch Umformung der Masselektrode dieser Zündkerze erzeugt werden.The structural features according to claims 3 and 4 enable a particularly simple construction of the invention. It is thus possible, for example, to produce a test pattern for the spark plug according to the invention from the conventional spark plug mentioned at the beginning by the arrangement of the webs and the ground electrode before the series production of the spark plug. One of these webs can be produced by reshaping the ground electrode of this spark plug.

Die (durch die Stege bewirkte) freistehende Anordnung und die tellerförmige Wirkung der ringförmigen Masseelektrode führt zur Ausbildung einer beruhigten Strömung des Gemisches zwischen dieser Elektrode und der Mittelelektrode mit der Folge einer vollständigen Zündung und Verbrennung des Gemisches. Dadurch kommt es in jedem Lastbereich zu einer optimalen Leistungsentfaltung mit vollständiger Verbrennung. Insbesondere der HC-Wert der Abgase ist dabei niedrig. Die durch die Stege bewirkte Anordnung der Masseelektrode zeichnet sich darüber hinaus auch bei längerem Betrieb durch besondere mechanische Stabilität aus und ermöglicht den Einsatz der Zündkerzen auch in mechanisch stark beanspruchten Brennkraftmaschinen. Beispiele hierfür sind i.d.R. 4-Ventil-Motore.The free-standing arrangement (caused by the webs) and the plate-shaped action of the ring-shaped ground electrode leads to the formation of a calm flow of the mixture between this electrode and the center electrode, with the result of complete ignition and combustion of the mixture. This results in optimal power delivery with complete combustion in every load range. In particular, the HC value of the exhaust gases is low. The arrangement of the ground electrode caused by the webs is also distinguished by special mechanical stability even during prolonged operation and enables the spark plugs to be used even in mechanically highly stressed internal combustion engines. Examples of these are usually 4-valve engines.

In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigt

  • Fig. 1 eine Zündkerze gemäß der Erfindung im Teilschnitt und
  • Fig. 2 die Zündkerze von Fig. 1 von unten betrachtet. Die Pfeile in Fig. 1 geben dabei die Blickrichtung an.
Exemplary embodiments of the invention are shown in the drawing. It shows
  • Fig. 1 shows a spark plug according to the invention in partial section
  • Fig. 2 shows the spark plug of Fig. 1 viewed from below. The arrows in Fig. 1 indicate the direction of view.

Die Zündkerze 1 gemäß der Erfindung ist in ihrem oberen, zu dem nicht dargestellten Zündkabel führenden Teil von der üblichen Bauform. Es befinden sich beispielsweise ein Anschlußkontaktteil 2, ein Isolierkörper 3 sowie ein 6-eckiger Schaft 4. Zentrisch angeordnet ist eine Mittelelektrode 5 sowie eine ringförmige Masseelektrode 6. Der Innendurchmesser der Masseelektrode 6 ist größer als der Außendurchmesser der Mittelelektrode 5.The spark plug 1 according to the invention is in its upper part leading to the ignition cable, not shown, of the usual design. There are, for example, a connection contact part 2, an insulating body 3 and a hexagonal shaft 4. A center electrode 5 and an annular ground electrode 6 are arranged centrally. The inside diameter of the ground electrode 6 is larger than the outside diameter of the center electrode 5.

Die Masseelektrode ist durch drei Stege 7 weitgehend freiliegend gehalten, die parallel zur Längsachse der Zündkerze 1 verlaufen. Dabei liegen radial von der Masseelektrode 6 abstehende Ansätze 8 auf den Endflächen der Stege auf.The ground electrode is kept largely exposed by three webs 7, which run parallel to the longitudinal axis of the spark plug 1. In this case, lugs 8 projecting radially from the ground electrode 6 rest on the end faces of the webs.

Durch die bauliche Ausgestaltung der Zündkerze läßt sich der Zündfunke in der gewünschten Lage bezüglich des Brennraums positionieren. Die ringförmige Ausgestaltung der Masseelektrode gewährleistet darüberhinaus einen gleichmäßigen Abbrand der Mittelektrode, da der Zündfunke bei unterschiedlichen Betriebsbedingungen der Brennkraftmaschine von unterschiedlichen Stellen der Mittelelektrode ausgeht.Due to the structural design of the spark plug, the ignition spark can be positioned in the desired position with respect to the combustion chamber. The ring-shaped design of the ground electrode also ensures uniform erosion of the center electrode, since the ignition spark originates from different locations of the center electrode under different operating conditions of the internal combustion engine.

Ferner wirkt die freistehende Masseelektrode als Leitkörper für einen Teil des Gemischs, der dadurch in Form einer beruhigten, gleichmäßigen Strömung in die Funkenstrecke zwischen den beiden Elektroden 5 und 6 eingeführt wird, dort vollständig entflammt wird und im weiteren Verlauf das verbleibende Gemisch ebenfalls vollständig nach Art einer Initialzündung entzündet. Dies geschieht ohne zeitliche, durch unbeabsichtigte Turbulenzen verursachte Verluste. Das Gemisch wird damit vollständig verbrannt und verläßt die Brennkraftmaschine mit geringst-möglichem Anteil von unverbrannten Kohlenwasserstoffen.Furthermore, the free-standing ground electrode acts as a guide body for a part of the mixture, which is thereby introduced in the form of a calm, even flow into the spark gap between the two electrodes 5 and 6, where it is completely ignited and in the further course the remaining mixture is also completely in accordance with Art an initial spark ignited. This is done without temporal losses caused by unintended turbulence. The mixture is thus completely burned and leaves the internal combustion engine with the lowest possible proportion of unburned hydrocarbons.

Claims (4)

1. Zündkerze für eine Brennkraftmaschine mit einer mit ihrem freien Ende zentrisch angeordneten Mittelelektrode und einer konzentrisch zu dieser angeordneten ringförmigen Masseelektrode, dadurch gekennzeichnet, daß die Masseelektrode (6) über die Mittelelektrode (5) in axialem Abstand hinausstehend weitgehend freiliegend angeordnet ist.1. Spark plug for an internal combustion engine with a center electrode arranged centrally with its free end and an annular ground electrode arranged concentrically to the latter, characterized in that the ground electrode (6) is arranged to be largely exposed at an axial distance from the center electrode (5). 2. Zündkerze nach Anspruch 1, dadurch gekennzeichnet, daß der Innendurchmesser der Masseelektrode (6) größer als der oder gleich dem Außendurchmesser der Mittelelektrode (5) ist.2. Spark plug according to claim 1, characterized in that the inner diameter of the ground electrode (6) is greater than or equal to the outer diameter of the central electrode (5). 3. Zündkerze nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Masseelektrode (6) durch parallel zur Längsachse der Zündkerze (1) verlaufende Stege (7) gehalten ist.3. Spark plug according to claim 1 or 2, characterized in that the ground electrode (6) is held by webs (7) extending parallel to the longitudinal axis of the spark plug (1). 4. Zündkerze nach Anspruch 3, dadurch gekennzeichnet, daß die Masseelektrode (6) radiale Ansätze (8) besitzt, die auf den Endflächen der Stege (7) aufliegen.4. Spark plug according to claim 3, characterized in that the ground electrode (6) has radial lugs (8) which rest on the end faces of the webs (7).
EP87108504A 1986-06-13 1987-06-12 Sparking plug for internal-combustion engines Ceased EP0249241A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3619938 1986-06-13
DE19863619938 DE3619938A1 (en) 1986-06-13 1986-06-13 SPARK PLUG FOR INTERNAL COMBUSTION ENGINES

Publications (1)

Publication Number Publication Date
EP0249241A1 true EP0249241A1 (en) 1987-12-16

Family

ID=6302937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108504A Ceased EP0249241A1 (en) 1986-06-13 1987-06-12 Sparking plug for internal-combustion engines

Country Status (3)

Country Link
EP (1) EP0249241A1 (en)
DE (1) DE3619938A1 (en)
WO (1) WO1987007777A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640091A1 (en) * 1988-11-24 1990-06-08 Kashiwara Ryohei HOLLOW CYLINDRICAL MOLD ELECTRODE IGNITION CANDLE AND METHOD FOR IMPLEMENTING THE SAME
EP1221187A1 (en) 1999-08-05 2002-07-10 Halo, Inc. Method of manufacturing a spark plug with concentrically disposed double ring ground electrode
DE102008040429A1 (en) * 2008-07-15 2010-01-28 Ge Jenbacher Gmbh & Co. Ohg Flow protection device on a laser spark plug to improve the ignition behavior

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705372C2 (en) * 1997-02-12 2002-06-27 Beru Werk Ruprecht Gmbh Co A Spark plug for an internal combustion engine
US9172217B2 (en) 2010-11-23 2015-10-27 Woodward, Inc. Pre-chamber spark plug with tubular electrode and method of manufacturing same
US8584648B2 (en) 2010-11-23 2013-11-19 Woodward, Inc. Controlled spark ignited flame kernel flow
US9476347B2 (en) 2010-11-23 2016-10-25 Woodward, Inc. Controlled spark ignited flame kernel flow in fuel-fed prechambers
US9856848B2 (en) 2013-01-08 2018-01-02 Woodward, Inc. Quiescent chamber hot gas igniter
US8839762B1 (en) 2013-06-10 2014-09-23 Woodward, Inc. Multi-chamber igniter
US9765682B2 (en) 2013-06-10 2017-09-19 Woodward, Inc. Multi-chamber igniter
JP5847259B2 (en) 2013-11-12 2016-01-20 日本特殊陶業株式会社 Spark plug
WO2016154056A1 (en) 2015-03-20 2016-09-29 Woodward, Inc. Parallel prechamber ignition system
US9653886B2 (en) 2015-03-20 2017-05-16 Woodward, Inc. Cap shielded ignition system
US9890689B2 (en) 2015-10-29 2018-02-13 Woodward, Inc. Gaseous fuel combustion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB418545A (en) * 1934-02-22 1934-10-26 Edward Trezise Bunt Improvements in or relating to sparking plugs for internal combustion engines
US2299924A (en) * 1941-04-11 1942-10-27 Frederick A Ost Spark plug
DE748641C (en) * 1936-12-03 1944-11-08 Spark plug with a bridge electrode
DE2444454A1 (en) * 1973-09-21 1975-04-03 Lectra Holding S A Soc Internal combustion engine spark plug - has precombustion or turbulence chamber which provokes forced ventilation of gas during induction and exhaust
GB2149852A (en) * 1983-11-18 1985-06-19 Ford Motor Co Spark plugs
EP0167687A1 (en) * 1984-07-10 1986-01-15 Wen-Tu Wang A spark plug with a ring-shaped ground electrode

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1576667A1 (en) * 1967-05-22 1970-11-26 Entwicklung Und Appbau Dipl In Electric ignition device, especially spark plug for internal combustion engines
JPS52129806A (en) * 1976-04-22 1977-10-31 Nippon Soken Inc Combustion chamber of internal combustion engine
ZA805008B (en) * 1979-10-22 1981-08-26 Champion Spark Plug Co Spark igniter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB418545A (en) * 1934-02-22 1934-10-26 Edward Trezise Bunt Improvements in or relating to sparking plugs for internal combustion engines
DE748641C (en) * 1936-12-03 1944-11-08 Spark plug with a bridge electrode
US2299924A (en) * 1941-04-11 1942-10-27 Frederick A Ost Spark plug
DE2444454A1 (en) * 1973-09-21 1975-04-03 Lectra Holding S A Soc Internal combustion engine spark plug - has precombustion or turbulence chamber which provokes forced ventilation of gas during induction and exhaust
GB2149852A (en) * 1983-11-18 1985-06-19 Ford Motor Co Spark plugs
EP0167687A1 (en) * 1984-07-10 1986-01-15 Wen-Tu Wang A spark plug with a ring-shaped ground electrode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640091A1 (en) * 1988-11-24 1990-06-08 Kashiwara Ryohei HOLLOW CYLINDRICAL MOLD ELECTRODE IGNITION CANDLE AND METHOD FOR IMPLEMENTING THE SAME
EP1221187A1 (en) 1999-08-05 2002-07-10 Halo, Inc. Method of manufacturing a spark plug with concentrically disposed double ring ground electrode
DE102008040429A1 (en) * 2008-07-15 2010-01-28 Ge Jenbacher Gmbh & Co. Ohg Flow protection device on a laser spark plug to improve the ignition behavior
US9133813B2 (en) 2008-07-15 2015-09-15 Robert Bosch Gmbh Flow-protection device on a laser spark plug for improving the ignition behavior

Also Published As

Publication number Publication date
DE3619938A1 (en) 1987-12-17
WO1987007777A1 (en) 1987-12-17

Similar Documents

Publication Publication Date Title
DE3731211C2 (en)
EP0675272B1 (en) Prechamber ignition device
EP0249241A1 (en) Sparking plug for internal-combustion engines
DE69622818T2 (en) Spark plug for use in an internal combustion engine
DE69002720T2 (en) Ignition amplifier system at gas flare.
DE3309256A1 (en) DEVICE FOR STARTING A DIESEL ENGINE WITH PLASMA SPARK PLUGS
EP2678907B1 (en) Spark plug having an end part
EP1265329A1 (en) Spark plug of an internal combustion engine
DE19849317A1 (en) Spark plug for internal combustion engine
EP2678908A1 (en) Spark plug
DE69503763T2 (en) SPARK PLUG
DE102005043636A1 (en) Spark plug with higher durability and resistance to carbon contamination
EP0812410B1 (en) Pencil type glow plug for diesel engines
DE3819220C2 (en)
DE3841941C2 (en) spark plug
DE2758734A1 (en) METHOD FOR REDUCING THE GENERATION OF POLLUTANTS BY AN INDUSTRIAL ENGINE AND ITS IMPLEMENTATION
DE10340043A1 (en) spark plug
EP0475288B1 (en) Plasma jet ignition system
DE4429272A1 (en) Spark plug for an internal combustion engine
DE69504285T2 (en) IMPROVED SPARK PLUG SYSTEM
DE3530997C2 (en)
DE19503223C2 (en) Spark plug for an internal combustion engine
DE1576667A1 (en) Electric ignition device, especially spark plug for internal combustion engines
EP0858139B1 (en) Sparking plug
DE3407951C2 (en)

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT SE

17P Request for examination filed

Effective date: 19880224

17Q First examination report despatched

Effective date: 19890124

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

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19900303

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOLZMANN, JOSEF