EP0439832A1 - Ignition device for combustion engines - Google Patents

Ignition device for combustion engines Download PDF

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Publication number
EP0439832A1
EP0439832A1 EP90125476A EP90125476A EP0439832A1 EP 0439832 A1 EP0439832 A1 EP 0439832A1 EP 90125476 A EP90125476 A EP 90125476A EP 90125476 A EP90125476 A EP 90125476A EP 0439832 A1 EP0439832 A1 EP 0439832A1
Authority
EP
European Patent Office
Prior art keywords
cylinder housing
ignition system
water
air
spark 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.)
Withdrawn
Application number
EP90125476A
Other languages
German (de)
French (fr)
Inventor
Martin Car
Erich Pöhlmann
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.)
Didier Werke AG
Original Assignee
Didier 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 Didier Werke AG filed Critical Didier Werke AG
Publication of EP0439832A1 publication Critical patent/EP0439832A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/02—Arrangements having two or more sparking plugs
    • 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
    • H01T13/02—Details
    • H01T13/16—Means for dissipating heat

Definitions

  • the invention relates to an ignition system for water- or air-cooled internal combustion engines, in which multiple ignition is possible with at least two spark plugs connected in series by at least one of the spark plugs of a pair of spark plugs being arranged in an electrically insulated manner from the cylinder housing, while the other spark plug of the pair of spark plugs is directly in the cylinder head is screwed in.
  • Such an ignition system is known for example from CH-PS 99 121. With such an ignition system, multiple ignition is possible in a cost-saving manner with a single ignition coil and a single breaker.
  • the object of the present invention is to create an ignition system of the generic type while maintaining a double or multiple ignition without the expense of two ignition systems, in which the problems of different temperature loads on the spark plugs are eliminated or at least considerably reduced.
  • spark plug which is electrically insulated from the cylinder housing, is arranged in the water-cooled or air-cooled region of the cylinder housing. This way, this spark plug can be taken advantage of anyway Existing cooling can be kept at an almost constant temperature, regardless of the type of engine, engine speed and driving style. This creates an ignition system which brings the advantages of double or multiple ignition to internal combustion engines without having to put up with the problems of different temperature loads on the spark plugs.
  • a particularly favorable cooling effect is achieved when the one electrically insulated spark plug crosses the water- or air-cooled space of the cylinder housing. In this way, the electrically insulated spark plug is immediately cooled.
  • the electrically insulated spark plug is screwed into the outer jacket of the cylinder housing and sealed against the inner jacket of the cylinder housing, while the electrodes protrude through an opening in the inner jacket into the combustion chamber.
  • the electrical insulation of the spark plug can advantageously be achieved in that the electrodes are formed from heat-resistant metal wires and are received in bores in a ceramic insulating body which crosses the water or air-flushed space of the cylinder housing.
  • the insulating body can be protected in the section crossing the water or air-flushed space without impairing its cooling by being accommodated in a metal tube, for example made of stainless steel.
  • This metal tube can advantageously be used for mounting the electrically insulated spark plug in that it is screwed into the outer jacket of the cylinder housing by means of a thread.
  • the thread of a conventional spark plug can be used here.
  • the metal tube can preferably lie with a sealing face against the inner jacket of the cylinder housing.
  • the figure shows schematically in section an embodiment of an ignition system according to the invention in the area of the cylinder housing.
  • a spark plug 1 is arranged in the water-cooled area of the cylinder housing 2 by crossing the water-cooled space 3 between the outer jacket 4 and the inner jacket 5 of the cylinder housing 2.
  • the spark plug 1 has two electrodes 6 and 7 formed by heat-resistant metal wires, which are arranged in longitudinal bores 10 and 11 of a cylindrical ceramic insulation body 12. With their free ends, the electrodes 6 and 7 protrude through an opening 8 in the inner casing 5 of the cylinder housing 2 into the combustion chamber 9 Sealing rings 17, which is arranged in a recess 18 of the inner shell 5, is sealed against the inner shell 5.
  • the metal tube 13 is screwed into the outer jacket 4 by means of a thread 14.
  • the metal tube 13 widens in the section protruding from the outer jacket 4 to form a shoulder 19.
  • a further sealing ring 16 is arranged between the shoulder 19 and the outer surface of the outer jacket 4. With its outer end, the insulating body 12 lies on an inner shoulder 20 of the metal tube 13, so that it is held axially immovably.

Abstract

The invention relates to an ignition device for water-cooled or air-cooled internal-combustion engines, in which multiple ignition is possible with at least two spark plugs which are electrically connected in series, in that at least one of the spark plugs of a pair of spark plugs is arranged electrically insulated from the cylinder housing whilst the other spark plug of the pair of spark plugs is screwed into the cylinder head in a conventional manner. In order to avoid temperature stressing of the electrically insulated spark plug, it is proposed with the invention that the latter be arranged in the water-cooled or air-cooled area of the cylinder housing.

Description

Die Erfindung bezieht sich auf eine Zündanlage für wasser- oder luftgekühlte Brennkraftmaschinen, bei welcher mit wenigstens zwei elektrisch hintereinandergeschalteten Zündkerzen eine Mehrfachzündung möglich ist, indem wenigstens eine der Zündkerzen eines Zündkerzenpaares elektrisch isoliert gegenüber dem Zylindergehäuse angeordnet ist, während die andere Zündkerze des Zündkerzenpaares unmittelbar in den Zylinderkopf eingeschraubt ist.The invention relates to an ignition system for water- or air-cooled internal combustion engines, in which multiple ignition is possible with at least two spark plugs connected in series by at least one of the spark plugs of a pair of spark plugs being arranged in an electrically insulated manner from the cylinder housing, while the other spark plug of the pair of spark plugs is directly in the cylinder head is screwed in.

Eine derartige Zündanlage ist beispielsweise aus der CH-PS 99 121 bekannt. Bei einer solchen Zündanlage ist kostensparend mit einer einzigen Zündspule und einem einzigen Unterbrecher eine Mehrfachzündung möglich.Such an ignition system is known for example from CH-PS 99 121. With such an ignition system, multiple ignition is possible in a cost-saving manner with a single ignition coil and a single breaker.

Im Flugmotorenbau wird seit langem aus Sicherheitsgründen mit Hilfe zweier herkömmlicher Zündkerzen und zweier Zündsysteme praktiziert. Auch wird für hochwertige Personenkraftwagen gelegentlich eine Doppelzündung mit zwei Zündkerzen pro Zylinder und zwei Zündspulen mit dem dazugehörigen Zubehör angeboten. Diese Lösungen sind jedoch kostenaufwendig. Problematisch bei der Verwendung herkömmlicher Zündkerzen ist zudem die unterschiedliche Temperaturbelastung bei verschiedenen Motoren und unterschiedlicher Fahrweise.For safety reasons, aircraft engine construction has long been practiced using two conventional spark plugs and two ignition systems. A double ignition with two spark plugs per cylinder and two ignition coils with the associated accessories is also occasionally offered for high-quality passenger cars. However, these solutions are expensive. Another problem when using conventional spark plugs is the different temperature loads in different engines and different driving styles.

Die Mehrfachzündung bei Brennkraftmaschinen, insbesondere Motoren von Kraftfahrzeugen, erfährt neuerdings deswegen wieder zunehmendes Interesse, weil mit ihr aufgrund einer besseren Verbrennung des Kraftstoffes eine Verminderung des Schadstoffausstoßes erzielt werden kann.The multiple ignition in internal combustion engines, in particular engines of motor vehicles, has recently gained increasing interest because it can be used to reduce pollutant emissions due to better combustion of the fuel.

Aufgabe der vorliegenden Erfindung ist es, eine Zündanlage der gattungsgemäßen Art unter Beibehaltung einer Doppel- oder Mehrfachzündung ohne den Aufwand zweier Zündsysteme zu schaffen, bei welcher die Probleme der unterschiedlichen Temperaturbelastung der Zündkerzen beseitigt oder zumindest erheblich verringert sind.The object of the present invention is to create an ignition system of the generic type while maintaining a double or multiple ignition without the expense of two ignition systems, in which the problems of different temperature loads on the spark plugs are eliminated or at least considerably reduced.

Diese Aufgabe wird erfindungsgemäß im wesentlichen dadurch gelöst, daß die eine gegenüber dem Zylindergehäuse elektrisch isolierte Zündkerze im wasser- oder luftgekühlten Bereich des Zylindergehäuses angeordnet ist. Auf diese Weise kann diese Zündkerze unter Ausnutzung der ohnehin vorhandenen Kühlung auf annähernd konstanter Temperatur gehalten werden, und zwar unabhängig von der Art des Motors, der Motordrehzahl und auch der Fahrweise. Hierdurch ist eine Zündanlage geschaffen, welche die Vorteile der Doppel- oder Mehrfachzündung bei Brennkraftmaschinen mit sich bringt, ohne die Probleme der unterschiedlichen Temperaturbeanspruchung der Zündkerzen in Kauf nehmen zu müssen.This object is essentially achieved in that the spark plug, which is electrically insulated from the cylinder housing, is arranged in the water-cooled or air-cooled region of the cylinder housing. This way, this spark plug can be taken advantage of anyway Existing cooling can be kept at an almost constant temperature, regardless of the type of engine, engine speed and driving style. This creates an ignition system which brings the advantages of double or multiple ignition to internal combustion engines without having to put up with the problems of different temperature loads on the spark plugs.

Ein besonders günstiger Kühleffekt wird dann erzielt, wenn die eine elektrisch isolierte Zündkerze den wasser- oder luftdurchkühlten Raum des Zylindergehäuses durchquert. Auf diese Weise wird die elektrisch isolierte Zündkerze unmittelbar gekühlt.A particularly favorable cooling effect is achieved when the one electrically insulated spark plug crosses the water- or air-cooled space of the cylinder housing. In this way, the electrically insulated spark plug is immediately cooled.

Bei einer baulich besonders günstigen Ausgestaltung der Erfindung ist vorgesehen, daß die elektrisch isolierte Zündkerze in den äußeren Mantel des Zylindergehäuses eingeschraubt und gegen den inneren Mantel des Zylindergehäuses abgedichtet ist, während die Elektroden durch eine Öffnung im inneren Mantel in den Verbrennungsraum hineinragen.In a structurally particularly advantageous embodiment of the invention it is provided that the electrically insulated spark plug is screwed into the outer jacket of the cylinder housing and sealed against the inner jacket of the cylinder housing, while the electrodes protrude through an opening in the inner jacket into the combustion chamber.

Die elektrische Isolierung der Zündkerze kann gemäß einem weiteren Erfindungsmerkmal vorteilhafterweise dadurch erzielt werden, daß die Elektroden von hitzebeständigen Metalldrähten gebildet und in Bohrungen eines keramischen Isolierkörpers aufgenommen sind, welche den wasser- oder luftdurchspülten Raum des Zylindergehäuses durchquert.According to a further feature of the invention, the electrical insulation of the spark plug can advantageously be achieved in that the electrodes are formed from heat-resistant metal wires and are received in bores in a ceramic insulating body which crosses the water or air-flushed space of the cylinder housing.

Der Isolationskörper kann in dem den wasser- oder luftdurchspülten Raum durchquerenden Abschnitt ohne Beeinträchtigung seiner Kühlung dadurch geschützt sein, daß er in einem, zum Beispiel aus Edelstahl bestehenden Metallrohr aufgenommen ist.The insulating body can be protected in the section crossing the water or air-flushed space without impairing its cooling by being accommodated in a metal tube, for example made of stainless steel.

Diese Metallrohr kann vorteilhafterweise zur Montage der elektrisch isolierten Zündkerze dadurch dienen, daß es mittels Gewinde in den äußeren Mantel des Zylindergehäuses eingeschraubt ist. Hier kann das Gewinde einer üblichen Zündkerze verwendet werden.This metal tube can advantageously be used for mounting the electrically insulated spark plug in that it is screwed into the outer jacket of the cylinder housing by means of a thread. The thread of a conventional spark plug can be used here.

Um die erforderliche Abdichtung des Isolierkörpers gegen den wasser- oder luftdurchspülten Raum zu erzielen, kann dabei das Metallrohr vorzugsweise mit einer Stirnfläche dichtend gegen den inneren Mantel des Zylindergehäuses anliegen.In order to achieve the required sealing of the insulating body against the water or air-flushed space, the metal tube can preferably lie with a sealing face against the inner jacket of the cylinder housing.

Weitere Ziele, Merkmale, Vorteile und Anwendungsmöglichkeiten der vorliegenden Erfindung ergeben sich aus den nachfolgenden Beschreibungen eines Ausführungsbeispieles an Hand der Zeichnung. Dabei bilden alle beschriebenen und/oder bildlich dargestellten Merkmale für sich oder in beliebiger sinnvoller Kombination den Gegenstand der vorliegenden Erfindung auch unabhängig von ihrer Zusammenfassung in den Ansprüchen oder deren Rückbeziehung.Further objectives, features, advantages and possible uses of the present invention result from the following descriptions of an exemplary embodiment with reference to the drawing. All of the described and / or illustrated features, alone or in any meaningful combination, form the subject matter of the present invention, regardless of how they are summarized in the claims or their relationship.

Es zeigt die Figur schematisch im Schnitt ein Ausführungsbeispiel einer die Erfindung aufweisenden Zündanlage im Bereich des Zylindergehäuses.The figure shows schematically in section an embodiment of an ignition system according to the invention in the area of the cylinder housing.

Eine Zündkerze 1 ist im wassergekühlten Bereich des Zylindergehäuses 2 angeordnet, indem sie den wassergekühlten Raum 3 zwischen dem äußeren Mantel 4 und dem inneren Mantel 5 des Zylindergehäuses 2 durchquert. Die Zündkerze 1 hat zwei von hitzebeständigen Metalldrähten gebildete Elektrode 6 und 7, welche in Längsbohrungen 10 und 11 eines zylindrischen keramischen Isolationskörpers 12 angeordnet sind. Mit ihren freien Enden ragen die Elektroden 6 und 7 durch eine Öffnung 8 in dem inneren Mantel 5 des Zylindergehäuses 2 bis in den Verbrennungsraum 9. Der Isolationskörper 12 ist in einem zylindrischen Metallrohr 13 aufgenommen, welches mit seiner zum inneren Mantel 5 weisenden Stirnfläche 15 mittels Dichtringe 17, welcher in einer Aussparung 18 des inneren Mantels 5 angeordnet ist, gegen den inneren Mantel 5 abgedichtet ist. An seinem gegenüberliegenden Ende ist das Metallrohr 13 mittels Gewinde 14 in den äußeren Mantel 4 eingeschraubt. Das Metallrohr 13 erweitert sich in dem aus dem äußeren Mantel 4 herausragenden Abschnitt unter Bildung einer Schulter 19. Zwischen der Schulter 19 und der Außenfläche des äußeren Mantels 4 ist ein weiterer Dichtring 16 angeordnet. Mit seinem äußeren Ende liegt der Isolierkörper 12 an einer Innenschulter 20 des Metallrohres 13, so daß er axial unverrückbar gehalten ist.A spark plug 1 is arranged in the water-cooled area of the cylinder housing 2 by crossing the water-cooled space 3 between the outer jacket 4 and the inner jacket 5 of the cylinder housing 2. The spark plug 1 has two electrodes 6 and 7 formed by heat-resistant metal wires, which are arranged in longitudinal bores 10 and 11 of a cylindrical ceramic insulation body 12. With their free ends, the electrodes 6 and 7 protrude through an opening 8 in the inner casing 5 of the cylinder housing 2 into the combustion chamber 9 Sealing rings 17, which is arranged in a recess 18 of the inner shell 5, is sealed against the inner shell 5. At its opposite end, the metal tube 13 is screwed into the outer jacket 4 by means of a thread 14. The metal tube 13 widens in the section protruding from the outer jacket 4 to form a shoulder 19. A further sealing ring 16 is arranged between the shoulder 19 and the outer surface of the outer jacket 4. With its outer end, the insulating body 12 lies on an inner shoulder 20 of the metal tube 13, so that it is held axially immovably.

Bezugszeichenliste:Reference symbol list:

11
Zündkerze spark plug
22nd
Zylindergehäuse Cylinder housing
33rd
wasser- oder luftdurchspülter Raum water or air rinsed room
44th
äußerer Mantel outer coat
55
innerer Mantel inner coat
66
Elektrode electrode
77
Elektrode electrode
88th
Öffnung opening
99
Verbrennungsraum Combustion chamber
1010th
Bohrung drilling
1111
Bohrung drilling
1212
Isolationskörper Insulation body
1313
Metallrohr Metal pipe
1414
Gewinde thread
1515
Stirnfläche Face
1616
Dichtung poetry
1717th
Dichtung poetry
1818th
Aussparung Recess
1919th
Schulter shoulder
2020th
Innenschulter Inner shoulder

Claims (7)

Zündanlage für wasser- oder luftgekühlte Brennkraftmaschinen, bei welcher mit wenigstens zwei elektrisch hintereinandergeschalteten Zündkerzen eine Mehrfachzündung ermöglicht ist, indem wenigstens eine der Zündkerzen (1) eines Zündkerzenpaares elektrisch isoliert gegenüber dem Zylindergehäuse (2) angeordnet ist, während die andere Zündkerze des Zündkerzenpaares unmittelbar in den Zylinderkopf eingeschraubt ist,
dadurch gekennzeichnet,
daß die eine Zündkerze (1) im wasser- oder luftgekühlten Bereich des Zylindergehäuses (2) ist.Ignition system for water- or air-cooled internal combustion engines, in which multiple ignition is made possible with at least two spark plugs connected in series by at least one of the spark plugs (1) of a pair of spark plugs being arranged in an electrically insulated manner from the cylinder housing (2), while the other spark plug of the pair of spark plugs is directly in the cylinder head is screwed in,
characterized,
that the one spark plug (1) in the water or air-cooled area of the cylinder housing (2). Zündanlage nach Anspruch 1,
dadurch gekennzeichnet,
daß die eine Zündkerze (1) den wasser- oder luftdurchspülten Raum (3) des Zylindergehäuses (2) durchquert.Ignition system according to claim 1,
characterized,
that a spark plug (1) passes through the water or air-flushed space (3) of the cylinder housing (2). Zündanlage nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die eine Zündkerze (1) in den äußeren Mantel (4) des Zylindergehäuses (2) eingeschraubt und gegen den inneren Mantel (5) des Zylindergehäuses (2) abgedichtet ist, während die Elektroden (6, 7) durch eine Öffnung (8) im inneren Mantel (5) in den Verbrennungsraum (9) hineinragen.Ignition system according to claim 1 or 2,
characterized,
that the one spark plug (1) is screwed into the outer jacket (4) of the cylinder housing (2) and sealed against the inner jacket (5) of the cylinder housing (2), while the electrodes (6, 7) are opened through an opening (8) protrude into the combustion chamber (9) in the inner casing (5). Zündanlage nach Anspruch 3,
dadurch gekennzeichnet,
daß die Elektroden (6, 7) von hitzebeständigen Metalldrähten gebildet und in Bohrungen (10, 11) eines keramischen Isolationskörpers (12) aufgenommen sind, welcher den wasser- oder luftdurchspülten Raum (3) des Zylindergehäuses (2) durchquert.Ignition system according to claim 3,
characterized,
that the electrodes (6, 7) are formed by heat-resistant metal wires and are received in bores (10, 11) of a ceramic insulation body (12) which traverses the water- or air-flushed space (3) of the cylinder housing (2). Zündanlage nach Anspruch 4,
dadurch gekennzeichnet,
daß der Isolationskörper (12) in einem Metallrohr (13), zum Beispiel aus Edelstahl, aufgenommen ist.Ignition system according to claim 4,
characterized,
that the insulation body (12) is received in a metal tube (13), for example made of stainless steel. Zündanlage nach Anspruch 5,
dadurch gekennzeichnet,
daß das Metallrohr (13) mittels Gewinde (14) in den äußeren Mantel (4) des Zylindergehäuses (2) eingeschraubt ist.Ignition system according to claim 5,
characterized,
that the metal tube (13) is screwed into the outer casing (4) of the cylinder housing (2) by means of a thread (14). Zündanlage nach Anspruch 5 oder 6,
dadurch gekennzeichnet,
daß das Metallrohr (13) vorzugsweise mit einer Stirnfläche (15) dichtend gegen den inneren Mantel (5) des Zylindergehäuses (2) anliegt.Ignition system according to claim 5 or 6,
characterized,
that the metal tube (13) preferably rests with an end face (15) sealingly against the inner jacket (5) of the cylinder housing (2).
EP90125476A 1990-02-02 1990-12-24 Ignition device for combustion engines Withdrawn EP0439832A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4003021A DE4003021A1 (en) 1990-02-02 1990-02-02 IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES
DE4003021 1990-02-02

Publications (1)

Publication Number Publication Date
EP0439832A1 true EP0439832A1 (en) 1991-08-07

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ID=6399242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125476A Withdrawn EP0439832A1 (en) 1990-02-02 1990-12-24 Ignition device for combustion engines

Country Status (3)

Country Link
US (1) US5101783A (en)
EP (1) EP0439832A1 (en)
DE (1) DE4003021A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19829443A1 (en) * 1998-07-01 2000-01-05 Bayerische Motoren Werke Ag spark plug

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6703770B2 (en) * 2001-04-12 2004-03-09 Akira Suzuki Spark plug attachment structure and spark plug therefor
DE10129125A1 (en) * 2001-06-16 2003-01-02 Bosch Gmbh Robert spark plug

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FR1049402A (en) * 1950-07-06 1953-12-29 Thomson Houston Comp Francaise Two spark plug ignition device
US4177783A (en) * 1978-11-03 1979-12-11 Osvaldo Palomeque Dual spark plug ignition system
US4534322A (en) * 1982-09-29 1985-08-13 Honda Giken Kogyo Kabushiki Kaisha Arrangement for insertion of spark plugs in cylinder head
DE3728161A1 (en) * 1987-08-24 1989-03-09 Wolfram Behncke Spark plug with multiple ignition
US4944259A (en) * 1988-12-05 1990-07-31 Caterpillar Inc. Engine ignition system with an insulated and extendable extender

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Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH99121A (en) * 1921-01-28 1923-05-01 Vogel Josef Insulating adapter for double ignition devices.
DE736742C (en) * 1940-03-17 1943-06-26 Messerschmitt Boelkow Blohm Device for cooling the spark plugs of internal combustion engines
FR1049402A (en) * 1950-07-06 1953-12-29 Thomson Houston Comp Francaise Two spark plug ignition device
US4177783A (en) * 1978-11-03 1979-12-11 Osvaldo Palomeque Dual spark plug ignition system
US4534322A (en) * 1982-09-29 1985-08-13 Honda Giken Kogyo Kabushiki Kaisha Arrangement for insertion of spark plugs in cylinder head
DE3728161A1 (en) * 1987-08-24 1989-03-09 Wolfram Behncke Spark plug with multiple ignition
US4944259A (en) * 1988-12-05 1990-07-31 Caterpillar Inc. Engine ignition system with an insulated and extendable extender

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19829443A1 (en) * 1998-07-01 2000-01-05 Bayerische Motoren Werke Ag spark plug

Also Published As

Publication number Publication date
US5101783A (en) 1992-04-07
DE4003021C2 (en) 1993-02-11
DE4003021A1 (en) 1991-08-08

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