EP1508947B1 - Spark plug for internal combustion engine - Google Patents

Spark plug for internal combustion engine Download PDF

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Publication number
EP1508947B1
EP1508947B1 EP04017767A EP04017767A EP1508947B1 EP 1508947 B1 EP1508947 B1 EP 1508947B1 EP 04017767 A EP04017767 A EP 04017767A EP 04017767 A EP04017767 A EP 04017767A EP 1508947 B1 EP1508947 B1 EP 1508947B1
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EP
European Patent Office
Prior art keywords
spark plug
sealing
compensating element
plug according
cylinder head
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Revoked
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EP04017767A
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German (de)
French (fr)
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EP1508947A1 (en
Inventor
Werner Niessner
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BorgWarner Ludwigsburg GmbH
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Beru AG
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    • 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
    • H01T13/08—Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber

Definitions

  • the invention relates to a spark plug for an internal combustion engine with a spark plug body having a screw thread for screwing the spark plug into the cylinder head of the internal combustion engine, a center electrode and a ground electrode, which is isolated from the center electrode.
  • Such a spark plug is used to generate the spark for the combustion process and is screwed with its screw thread into the cylinder head of the internal combustion engine.
  • the screwing takes place by means of a wrench which engages a hexagon, which is provided on the spark plug body. It should be noted that the spark plug is tightened to a specified tightening torque.
  • a spark plug according to the preamble of claim 1 is made EP-A-1 039 601 known.
  • the object underlying the invention is therefore to provide a spark plug of the type mentioned, which can be screwed into the cylinder head, that a certain desired position of the ground electrode is ensured.
  • this is achieved while maintaining the current standard design of spark plugs, maintaining the usual assembly of spark plugs by means of a screw thread, with spark plugs that are suitable for the existing cylinder head geometries, using conventional mounting techniques and unaltered high voltage interface in the case of high voltage spark plugs.
  • the spark plug according to the invention is thus a series spark plug with a screw thread in standard geometry, which can be screwed into the cylinder head in such a way that the ground electrode is in a precisely positioned position can be arranged in the combustion chamber. In this case, no changes to the cylinder head, to the connector of the high voltage terminal and during assembly necessary because the spark plug has substantially the same geometry as a standard known series spark plug.
  • FIG. 1 is a conventional spark plug for an internal combustion engine of a metallic spark plug body with hexagon 1, 6 and screw thread 7, a center electrode 3 and a ground electrode 4, and a ceramic insulator 2, the ground electrode 4 and the central electrode 3 against each other electrically insulated.
  • spark plug is formed, that is provided in the manner shown with a sealing and compensating element 5, that they can be rotated when screwing into the cylinder head after reaching the prescribed tightening torque in particular by at least one thread further.
  • the sealing and compensating element 5 is manufactured with such a geometry and / or from such a material and arranged so that when tightening the spark plug to the prescribed tightening torque of, for example 30 Nm, the yield strength of the sealing and compensating element 5 is not exceeded and this thus burdened up to a limit of elasticity.
  • the sealing and compensating element 5 can then be greatly expanded with a small increase in the expenditure of force, so that it is possible to cover a large distance, for example a thread turn, with a small increase in force, that is to say with a small increase in the torque at the spark plug.
  • the sealing and compensating element 5 is in the in Fig. 1 illustrated manner arranged so that it is clamped when tightening the spark plug with the prescribed torque between the abutment collar 6 on the spark plug body and the cylinder head. It is thus located between the abutment collar 6 and the thread 7.
  • the sealing and compensation element 5 is annular with a thickness H formed so that its upper outer surface bears against the abutment collar 6 and its lower outer surface is in contact with the cylinder head.
  • the sealing and compensating element 5 is the in Fig. 1a illustrated manner formed centrally with a groove 8, whose cross-sectional area is chosen so that the load after applying a defined force corresponding to a tightening torque of 30 Nm, for example, exceeds the yield strength and the sealing and compensating element 5 by flowing its material to a small thickness, for example, to a thickness (H-1.25) mm deformed.
  • Fig. 1b shows a preferred embodiment of a device for determining the position of the ground electrode.
  • This device consists for example of a Bihex training 9 on an outer surface of the hexagon 1, the position of the ground electrode 4 can be assigned as it is in Fig. 1b is shown.
  • the hexagon 1 of the spark plug is formed so that the spark plug wrench fits only in a well-defined position on the hexagon 1, whereby a determination of the relative position between the ground electrode 4 and the spark plug key is ensured.
  • the position of the ground electrode 4 can be read by a corresponding mark on the spark plug key.
  • Fig. 2 shows in a side view a second preferred embodiment of the spark plug according to the invention, wherein on the left side of Fig. 2 that is in Fig. 2A the condition is shown that the spark plug after screwing with the prescribed tightening torque, while on the left side, that is in Fig. 2B the state is shown, which the spark plug assumes after further rotation and reaching the desired position of the ground electrode 4.
  • the sealing and compensating element 5 is formed in the form of a ring with a diameter D1 and an inner cone 10 at an angle ⁇ and the abutment collar 6 of the spark plug body is in turn also provided with a corresponding cone with the angle ⁇ .
  • the angle ⁇ is preferably between 5 ° and 45 °.
  • the sealing and balancing element 5 is pressed onto the cone of the spark plug body before the assembly of the candle.
  • the prescribed tightening torque of, for example, 30 Nm is applied to the spark plug, without the sealing and compensating element 5 deforming, as shown in FIG Fig. 2A is shown.
  • the sealing and compensating element 5 is formed with such a geometry and of a material having such a strength that its elastic limit is exceeded after the application of a defined force which corresponds to the prescribed tightening torque and the sealing and compensating element 5 after exceeding its yield strength flows like it does in Fig. 2B is shown.
  • Attaching a standard spark plug outer sealing ring is possible and may contribute to improving the tightness between cylinder head threads and spark plug bodies.

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

Abstract

The device has a thread (7) for screwing into the engine's cylinder head, a central electrode (3) and an earth electrode (4) that is electrically isolated relative to the central electrode. The ignition plug is designed so that it can continue to be rotated after reaching the prescribed tightening torque when screwed into the cylinder head.

Description

Die Erfindung betrifft eine Zündkerze für eine Brennkraftmaschine mit einem Zündkerzenkörper, der ein Einschraubgewinde zum Einschrauben der Zündkerze in den Zylinderkopf der Brennkraftmaschine aufweist, einer Mittelektrode und einer Masseelektrode, die gegenüber der Mittelektrode isoliert ist.The invention relates to a spark plug for an internal combustion engine with a spark plug body having a screw thread for screwing the spark plug into the cylinder head of the internal combustion engine, a center electrode and a ground electrode, which is isolated from the center electrode.

Eine derartige Zündkerze dient zum Erzeugen des Zündfunkens für den Verbrennungsvorgang und wird mit ihrem Einschraubgewinde in den Zylinderkopf der Brennkraftmaschine geschraubt.Such a spark plug is used to generate the spark for the combustion process and is screwed with its screw thread into the cylinder head of the internal combustion engine.

Das Einschrauben erfolgt mittels eines Schraubenschlüssels, der an einem Sechskant angreift, der am Zündkerzenkörper vorgesehen ist. Dabei ist zu beachten, dass die Zündkerze bis zu einem vorgeschriebenen Anzugsdrehmoment angezogen wird.The screwing takes place by means of a wrench which engages a hexagon, which is provided on the spark plug body. It should be noted that the spark plug is tightened to a specified tightening torque.

Bei üblichen Zündkerzen mit dem oben beschriebenen Aufbau besteht allerdings das Problem, dass im voll eingeschraubten Zustand, das heißt bei Erreichen des vorgeschriebenen Anzugsdrehmomentes die Position der Masseelektrode nicht genau bestimmt ist, da sich immer unterschiedliche Einbaupositionen ergeben und die Zündkerze nicht genau in der gewünschten Lage eingeschraubt werden kann. Da sich die Lage der Masseelektrode auf die Qualität des Verbrennungsvorganges auswirkt, ist die Position der Masseelektrode insbesondere bei BDE Motoren, das heißt bei strahlgeführten Motoren von besonderer Bedeutung.In conventional spark plugs with the structure described above, however, there is the problem that in the fully screwed state, that is, when reaching the prescribed tightening torque, the position of the ground electrode is not determined accurately, as always result in different mounting positions and the spark plug not exactly in the desired location can be screwed. Since the position of the ground electrode affects the quality of the combustion process, the position of the ground electrode is particularly important in BDE engines, that is, in spray-guided engines of particular importance.

Eine Zündkerze, gemäss Oberbegriff des Anspruchs 1 ist aus EP-A-1 039 601 bekannt.A spark plug according to the preamble of claim 1 is made EP-A-1 039 601 known.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, eine Zündkerze der eingangs genannten Art zu schaffen, die so in den Zylinderkopf eingeschraubt werden kann, dass eine bestimmte gewünschte Position der Masseelektrode sichergestellt ist.The object underlying the invention is therefore to provide a spark plug of the type mentioned, which can be screwed into the cylinder head, that a certain desired position of the ground electrode is ensured.

Diese Aufgabe wird gemäß der Erfindung durch die Ausbildung gelöst, die im Patentanspruch 1 angegeben ist.This object is achieved according to the invention by the formation which is specified in claim 1.

Bei der erfindungsgemäßen Zündkerze ist dafür gesorgt, dass eine Drehung auch über das vorgeschriebene Anzugsdrehmoment hinaus möglich ist, so dass über diese zusätzliche Drehung die Mittelelektrode genau in die gewünschte Position gebracht werden kann.In the case of the spark plug according to the invention, it is ensured that rotation beyond the prescribed tightening torque is also possible, so that via this additional rotation the center electrode can be brought exactly into the desired position.

Gemäß der Erfindung wird das unter Beibehaltung der derzeitig üblichen Auslegung von Zündkerzen, der Beibehaltung der üblichen Montage von Zündkerzen mittels eines Einschraubgewindes, bei Zündkerzen, die zu den vorhandenen Zylinderkopfgeometrien passend sind, unter Verwendung üblicher Montagetechniken und bei unveränderter Hochspannungsschnittstelle im Fall von Hochspannungszündkerzen erreicht.According to the invention, this is achieved while maintaining the current standard design of spark plugs, maintaining the usual assembly of spark plugs by means of a screw thread, with spark plugs that are suitable for the existing cylinder head geometries, using conventional mounting techniques and unaltered high voltage interface in the case of high voltage spark plugs.

Bei der erfindungsgemäßen Zündkerze handelt es sich somit um eine Serienzündkerze mit Einschraubgewinde in Normgeometrie, die so in den Zylinderkopf geschraubt werden kann, dass die Masseelektrode in einer genau positionierten Lage im Verbrennungsraum angeordnet werden kann. Dabei sind keine Änderungen am Zylinderkopf, an der Steckverbindung des Hochspannungsanschlusses sowie bei der Montage notwendig, da die Zündkerze im Wesentlichen die gleiche Geometrie wie eine genormte bekannte Serienzündkerze hat.The spark plug according to the invention is thus a series spark plug with a screw thread in standard geometry, which can be screwed into the cylinder head in such a way that the ground electrode is in a precisely positioned position can be arranged in the combustion chamber. In this case, no changes to the cylinder head, to the connector of the high voltage terminal and during assembly necessary because the spark plug has substantially the same geometry as a standard known series spark plug.

Besonders bevorzugte Ausführungsbeispiele, Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Zündkerze sind Gegenstand der Patentansprüche 2 bis 8.Particularly preferred embodiments, refinements and developments of the spark plug according to the invention are subject matter of the claims 2 to 8.

Im Folgenden werden anhand der zugehörigen Zeichnung besonders bevorzugte Ausführungsbeispiele der Erfindung näher beschrieben. Es zeigen

  • Fig. 1 eine schematische Seitenansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Zündkerze,
  • Fig. 1a eine teilweise geschnittene Seitenansicht des Bereiches zwischen dem Anlagebund und dem Einschraubgewinde bei der in Fig. 1 dargestellten Zündkerze,
  • Fig. 1b eine Draufsicht auf den Sechskant der in Fig. 1 dargestellten Zündkerze und
  • Fig. 2 eine Seitenansicht eines zweiten Ausführungsbeispiels der erfindungsgemäßen Zündkerze, wobei Fig. 2A den Zustand bei Erreichen des vorgeschriebenen Anzugsdrehmomentes und Fig. 2B den Zustand nach Erreichen der gewünschten Position der Masseelektrode zeigen.
In the following, particularly preferred embodiments of the invention will be described with reference to the accompanying drawings. Show it
  • Fig. 1 a schematic side view of a first embodiment of the spark plug according to the invention,
  • Fig. 1a a partially sectioned side view of the area between the abutment collar and the screw thread in the in Fig. 1 illustrated spark plug,
  • Fig. 1b a top view of the hexagon of in Fig. 1 illustrated spark plug and
  • Fig. 2 a side view of a second embodiment of the spark plug according to the invention, wherein Fig. 2A the state when reaching the prescribed tightening torque and Fig. 2B show the state after reaching the desired position of the ground electrode.

Wie es in Fig. 1 dargestellt ist, besteht eine übliche Zündkerze für eine Brennkraftmaschine aus einem metallischen Zündkerzenkörper mit Sechskant 1, Anlagebund 6 und Schraubgewinde 7, einer Mittelelektrode 3 und einer Masseelektrode 4, sowie einem keramischen Isolator 2, der die Masseelektrode 4 und die Mittelektrode 3 gegeneinander elektrisch isoliert.As it is in Fig. 1 is a conventional spark plug for an internal combustion engine of a metallic spark plug body with hexagon 1, 6 and screw thread 7, a center electrode 3 and a ground electrode 4, and a ceramic insulator 2, the ground electrode 4 and the central electrode 3 against each other electrically insulated.

Die in Fig. 1 dargestellte Zündkerze ist so ausgebildet, das heißt in der dargestellten Weise mit einem Dichtund Ausgleichselement 5 versehen, dass sie beim Einschrauben in den Zylinderkopf nach Erreichen des vorgeschriebenen Anzugsdrehmomentes insbesondere um mindestens einen Gewindegang weiter gedreht werden kann.In the Fig. 1 illustrated spark plug is formed, that is provided in the manner shown with a sealing and compensating element 5, that they can be rotated when screwing into the cylinder head after reaching the prescribed tightening torque in particular by at least one thread further.

Dazu ist das Dicht- und Ausgleichselement 5 mit einer derartigen Geometrie und/oder aus einem derartigen Werkstoff gefertigt und so angeordnet, dass beim Anziehen der Zündkerze bis zum vorgeschriebenen Anzugsdrehmoment von beispielsweise 30 Nm die Streckgrenze des Dicht- und Ausgleichselementes 5 nicht überschritten wird und dieses somit bis zu einer Elastizitätsgrenze belastet wird.For this purpose, the sealing and compensating element 5 is manufactured with such a geometry and / or from such a material and arranged so that when tightening the spark plug to the prescribed tightening torque of, for example 30 Nm, the yield strength of the sealing and compensating element 5 is not exceeded and this thus burdened up to a limit of elasticity.

Wenn die Zündkerze anschließend weiter gedreht wird, wird die Streckgrenze des Dicht- und Ausgleichselementes 5 überschritten und beginnt der Werkstoff des Dicht- und Ausgleichselementes zu fließen. Durch den Spannungsabfall kann dann mit einer geringen Zunahme des Kraftaufwands das Dichtund Ausgleichselement 5 stark gedehnt werden, so dass es möglich ist, mit einer geringen Kraftaufwandszunahme, das heißt mit einer kleinen Erhöhung des Drehmoments an der Zündkerze eine große Wegstrecke, beispielsweise eine Gewindeumdrehung zurückzulegen.If the spark plug is subsequently rotated further, the yield strength of the sealing and compensating element 5 is exceeded and the material of the sealing and compensating element begins to flow. Due to the voltage drop, the sealing and compensating element 5 can then be greatly expanded with a small increase in the expenditure of force, so that it is possible to cover a large distance, for example a thread turn, with a small increase in force, that is to say with a small increase in the torque at the spark plug.

Durch diese Ausbildung ist ein Weiterdrehen der Zündkerze nach Erreichen des vorgeschriebenen Anzugsdrehmomentes möglich, bis die gewünschte Position der Masseelektrode erreicht ist. Theoretisch ist es möglich, die Zündkerze um eine Gewindeumdrehung weiter zu drehen, ohne das Drehmoment signifikant zu erhöhen.By this design further rotation of the spark plug after reaching the prescribed tightening torque is possible until the desired position of the ground electrode is reached. Theoretically, it is possible to further rotate the spark plug by one turn without significantly increasing the torque.

Bei einem praktischen Ausführungsbeispiel bedeutet das, dass die Zündkerze mit einem Drehmoment von 30 Nm angezogen wird und dass ein Weiterdrehen der Zündkerze um eine Gewindeumdrehung (bei M12 und M14 ist dieses gleich 1,25 mm) mit einem zusätzlichen Kraftaufwand in der Größenordnung von 10 bis 15 Nm möglich ist.In a practical embodiment, this means that the spark plug is tightened with a torque of 30 Nm and that further rotation of the spark plug by a thread turn (in M12 and M14 this is equal to 1.25 mm) with an additional force on the order of 10 to 15 Nm is possible.

Das Dicht- und Ausgleichselement 5 ist dazu in der in Fig. 1 dargestellten Weise so angeordnet, dass es beim Anziehen der Zündkerze mit dem vorgeschriebenen Drehmoment zwischen dem Anlagebund 6 am Zündkerzenkörper und dem Zylinderkopf eingespannt ist. Es befindet sich somit zwischen dem Anlagebund 6 und dem Einschraubgewinde 7.The sealing and compensating element 5 is in the in Fig. 1 illustrated manner arranged so that it is clamped when tightening the spark plug with the prescribed torque between the abutment collar 6 on the spark plug body and the cylinder head. It is thus located between the abutment collar 6 and the thread 7.

Bei dem in Fig. 1 dargestellten Ausführungsbeispiel, das im Einzelnen in Fig. 1a dargestellt ist, ist das Dichtund Ausgleichselement 5 ringförmig mit einer Dicke H so ausgebildet, dass seine obere Außenfläche am Anlagebund 6 anliegt und seine untere Außenfläche in Kontakt mit dem Zylinderkopf steht. Das Dicht- und Ausgleichselement 5 ist der in Fig. 1a dargestellten Weise mittig mit einer Rille 8 ausgebildet, deren Querschnittsfläche so gewählt ist, dass die Belastung nach Anlegen einer definierten Kraft, die einem Anzugsdrehmoment von 30 Nm beispielsweise entspricht, die Streckgrenze überschreitet und sich das Dicht- und Ausgleichselement 5 durch Fließen seines Werkstoffes auf eine geringe Dicke beispielsweise auf eine Dicke (H-1,25) mm verformt.At the in Fig. 1 illustrated embodiment, in detail in Fig. 1a is shown, the sealing and compensation element 5 is annular with a thickness H formed so that its upper outer surface bears against the abutment collar 6 and its lower outer surface is in contact with the cylinder head. The sealing and compensating element 5 is the in Fig. 1a illustrated manner formed centrally with a groove 8, whose cross-sectional area is chosen so that the load after applying a defined force corresponding to a tightening torque of 30 Nm, for example, exceeds the yield strength and the sealing and compensating element 5 by flowing its material to a small thickness, for example, to a thickness (H-1.25) mm deformed.

Fig. 1b zeigt ein bevorzugtes Ausführungsbeispiel einer Einrichtung zur Bestimmung der Position der Masseelektrode. Diese Einrichtung besteht beispielsweise aus einer Bihex-Ausbildung 9 an einer Außenfläche des Sechskantes 1, der die Lage der Masseelektrode 4 so zugeordnet werden kann, wie es in Fig. 1b dargestellt ist. Fig. 1b shows a preferred embodiment of a device for determining the position of the ground electrode. This device consists for example of a Bihex training 9 on an outer surface of the hexagon 1, the position of the ground electrode 4 can be assigned as it is in Fig. 1b is shown.

Zum Erkennen der Lage der Masseelektrode ist somit der Sechskant 1 der Zündkerze so ausgebildet, dass der Zündkerzenschraubenschlüssel nur in einer genau definierten Position auf den Sechskant 1 passt, wodurch eine Bestimmung der relativen Lage zwischen der Masseelektrode 4 und dem Zündkerzenschlüssel sichergestellt ist. Beim Einschrauben und Festziehen der Zündkerze kann die Position der Masseelektrode 4 durch eine entsprechende Markierung am Zündkerzenschlüssel abgelesen werden. Nachdem in dieser Weise die Position der Masseelektrode 4 nach dem Anziehen mit dem vorgeschriebenen Anzugsdrehmoment bestimmt worden ist, kann durch ein Weiterdrehen der Zündkerze die Masseelektrode 4 in die gewünschte Position gebracht werden.For detecting the position of the ground electrode thus the hexagon 1 of the spark plug is formed so that the spark plug wrench fits only in a well-defined position on the hexagon 1, whereby a determination of the relative position between the ground electrode 4 and the spark plug key is ensured. When screwing in and tightening the spark plug, the position of the ground electrode 4 can be read by a corresponding mark on the spark plug key. After thus determining the position of the ground electrode 4 after being tightened with the prescribed tightening torque, the earth electrode 4 can be set to the desired position by further rotating the spark plug.

Fig. 2 zeigt in einer Seitenansicht ein zweites bevorzugtes Ausführungsbeispiel der erfindungsgemäße Zündkerze, wobei auf der linken Seite von Fig. 2, das heißt in Fig. 2A der Zustand dargestellt ist, den die Zündkerze nach dem Einschrauben mit dem vorgeschriebenen Anzugsdrehmoment einnimmt, während auf der linken Seite, das heißt in Fig. 2B der Zustand dargestellt ist, den die Zündkerze nach dem Weiterdrehen und Erreichen der gewünschten Position der Masseelektrode 4 einnimmt. Fig. 2 shows in a side view a second preferred embodiment of the spark plug according to the invention, wherein on the left side of Fig. 2 that is in Fig. 2A the condition is shown that the spark plug after screwing with the prescribed tightening torque, while on the left side, that is in Fig. 2B the state is shown, which the spark plug assumes after further rotation and reaching the desired position of the ground electrode 4.

Bei dem in Fig. 2 dargestellten Ausführungsbeispiel ist das Dicht- und Ausgleichselement 5 in Form eines Ringes mit einem Durchmesser D1 und einem Innenkonus 10 mit einem Winkel α ausgebildet und ist der Anlagebund 6 des Zündkerzenkörpers seinerseits ebenfalls mit einem entsprechenden Konus mit dem Winkel α versehen. Der Winkel α liegt vorzugsweise zwischen 5° und 45°. Das Dicht- und Ausgleichselement 5 ist vor der Kerzenmontage auf den Konus des Zündkerzenkörpers gepresst. Beim Einschrauben der Zündkerze liegt das vorgeschriebene Anzugsdrehmoment von beispielsweise 30 Nm an der Zündkerze, ohne dass sich das Dicht- und Ausgleichselement 5 verformt, wie es in Fig. 2A dargestellt ist.At the in Fig. 2 illustrated embodiment, the sealing and compensating element 5 is formed in the form of a ring with a diameter D1 and an inner cone 10 at an angle α and the abutment collar 6 of the spark plug body is in turn also provided with a corresponding cone with the angle α. The angle α is preferably between 5 ° and 45 °. The sealing and balancing element 5 is pressed onto the cone of the spark plug body before the assembly of the candle. When screwing in the spark plug, the prescribed tightening torque of, for example, 30 Nm is applied to the spark plug, without the sealing and compensating element 5 deforming, as shown in FIG Fig. 2A is shown.

Das Dicht- und Ausgleichselement 5 ist mit einer derartigen Geometrie und aus einem Werkstoff mit einer derartigen Festigkeit gebildet, dass seine Elastizitätsgrenze nach dem Anliegen einer definierten Kraft, die dem vorgeschriebenen Anzugsdrehmoment entspricht, überschritten wird und das Dicht- und Ausgleichselement 5 nach Überschreiten seiner Streckgrenze ins Fließen kommt, wie es in Fig. 2B dargestellt ist. Durch ein Weiterdrehen der Zündkerze mit einem geringen zusätzlichen Kraftaufwand von 10 bis 15 Nm kann dann die gewünschte Positionierung der Masseelektrode 4 erreicht werden.The sealing and compensating element 5 is formed with such a geometry and of a material having such a strength that its elastic limit is exceeded after the application of a defined force which corresponds to the prescribed tightening torque and the sealing and compensating element 5 after exceeding its yield strength flows like it does in Fig. 2B is shown. By further rotation of the spark plug with a small additional effort of 10 to 15 Nm then the desired positioning of the ground electrode 4 can be achieved.

Bei dieser Verformung des Dicht- und Ausgleichselementes 5 vergrößert sich sein Durchmesser auf D2, was bei der geometrischen Auslegung der Zündkerze zu berücksichtigen ist, damit ein Festsitzen in der Zylinderkopfbohrung ausgeschlossen wird.In this deformation of the sealing and compensating element 5, its diameter increases to D2, which must be taken into account in the geometric design of the spark plug, so that a tight fit in the cylinder head bore is excluded.

Das Anbringen eines standardmäßigen Zündkerzenaußendichtrings ist möglich und kann zur Verbesserung der Dichtheit zwischen Zylinderkopfgewinde und Zündkerzenkörper beitragen. Attaching a standard spark plug outer sealing ring is possible and may contribute to improving the tightness between cylinder head threads and spark plug bodies.

Claims (8)

  1. Spark plug for an internal combustion engine with a spark plug body having a screw thread for screwing into the cylinder head of the internal combustion engine, with a centre electrode and a ground electrode which is electrically insulated from the centre electrode, [and] with a deformable sealing and compensating element (5) which is arranged so as to be put under load by a tightening torque, the sealing and compensating element (5) being made with such geometry and from such material that upon application of a predetermined tightening torque it is loaded to its elastic limit and as the spark plug is overturned the material [of the sealing and compensating element (5)] is made to flow above the yield point, characterized in that a hexagon (1) on the spark plug body is configured so that when the assembly tool for the spark plug is slipped over the hexagon (1) the ground electrode (4) has a precise[ly] defined and identifiable position in relation to the assembly tool.
  2. Spark plug according to Claim 1, characterized in that it is designed to be overturned through at least one turn.
  3. Spark plug according to Claim 1 or Claim 2, characterized in that when the spark plug is screwed home, the sealing and compensating element (5) is trapped between a seating shoulder (6) on the spark plug body and the cylinder head.
  4. Spark plug according to any one of the preceding claims, characterized by an outer seal ring on the spark plug body.
  5. Spark plug according to any one of the preceding claims, characterized in that the sealing and compensating element (5) is ring-shaped.
  6. Spark plug according to Claim 5, characterized in that a groove (8) is formed in the middle of the outer face of the ring-shaped sealing and compensating element (5).
  7. Spark plug according to Claim 5, characterized in that the ring-shaped sealing and compensating element (5) has a taper (10) on its inner face by which it is pressed on to an outer face of the spark plug body formed with a matching taper.
  8. Spark plug according to any one of Claims 1 to 7, characterized in that the hexagon (1) has a bi-hex pattern (9) on one of its six faces.
EP04017767A 2003-08-22 2004-07-27 Spark plug for internal combustion engine Revoked EP1508947B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10338743 2003-08-22
DE10338743A DE10338743B4 (en) 2003-08-22 2003-08-22 Spark plug for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1508947A1 EP1508947A1 (en) 2005-02-23
EP1508947B1 true EP1508947B1 (en) 2011-09-14

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ID=34042250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04017767A Revoked EP1508947B1 (en) 2003-08-22 2004-07-27 Spark plug for internal combustion engine

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EP (1) EP1508947B1 (en)
AT (1) ATE524860T1 (en)
DE (1) DE10338743B4 (en)

Cited By (2)

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DE102012219380B3 (en) * 2012-10-24 2014-04-03 Ford Global Technologies, Llc Method for making and checking a female thread
US11962130B2 (en) 2020-12-22 2024-04-16 Caterpillar Energy Solutions Gmbh Contact surface of the spark plug jacket

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Publication number Priority date Publication date Assignee Title
JP4272682B2 (en) * 2006-10-30 2009-06-03 日本特殊陶業株式会社 Spark plug for internal combustion engine and method for manufacturing the same
DE102011015183B4 (en) * 2011-03-26 2014-12-11 Federal-Mogul Ignition Gmbh Spark plug and method of assembling a spark plug
DE102012009506A1 (en) 2011-05-27 2012-11-29 Volkswagen Aktiengesellschaft Cylinder of an internal combustion engine for a vehicle and corresponding manufacturing method, means for producing the cylinder, spark plug, internal combustion engine and vehicle
DE102014105694A1 (en) 2014-04-23 2015-10-29 Federal-Mogul Ignition Gmbh Sealing ring for a spark plug of an internal combustion engine, spark plug and internal combustion engine
DE102017109844B4 (en) 2017-05-08 2019-08-14 Federal-Mogul Ignition Gmbh A method of manufacturing a spark plug assembly and spark plug assembly
DE102022121764B4 (en) 2022-08-29 2024-06-27 Volkswagen Aktiengesellschaft Method for mounting spark plugs on a cylinder head of an internal combustion engine

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JPS6049586A (en) * 1983-08-29 1985-03-18 株式会社デンソー Ignition plug for internal combustion engine
JP2001187966A (en) * 1999-12-28 2001-07-10 Ngk Spark Plug Co Ltd Threaded member having gasket

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DE361810C (en) * 1922-03-14 1922-10-19 Maurice Pognon Spark plug with metal seal
US2921109A (en) * 1955-12-02 1960-01-12 Jet Igniton Co Inc Spark plugs
US3529837A (en) * 1968-12-02 1970-09-22 Champion Spark Plug Co Gasket
US4454445A (en) * 1979-11-07 1984-06-12 Fisher Bernard C Spark plug attachment
DE29720529U1 (en) * 1997-11-19 1998-01-08 Jenbacher Energiesysteme AG, Jenbach Spark plug and spark plug arrangement in an internal combustion engine
JP4104211B2 (en) * 1998-06-10 2008-06-18 日本特殊陶業株式会社 Gasket and threaded member having gasket
JP2000266186A (en) * 1999-03-19 2000-09-26 Ngk Spark Plug Co Ltd Gasket and spark plug with gasket
FR2794575B1 (en) * 1999-06-07 2001-08-24 Peugeot Citroen Automobiles Sa SPARK PLUG FOR INTERNAL COMBUSTION ENGINE
JP2002327674A (en) * 2001-04-27 2002-11-15 Ngk Spark Plug Co Ltd Ignition device for internal combustion engine

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JPS6049586A (en) * 1983-08-29 1985-03-18 株式会社デンソー Ignition plug for internal combustion engine
JP2001187966A (en) * 1999-12-28 2001-07-10 Ngk Spark Plug Co Ltd Threaded member having gasket

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012219380B3 (en) * 2012-10-24 2014-04-03 Ford Global Technologies, Llc Method for making and checking a female thread
US11962130B2 (en) 2020-12-22 2024-04-16 Caterpillar Energy Solutions Gmbh Contact surface of the spark plug jacket

Also Published As

Publication number Publication date
DE10338743A1 (en) 2005-03-17
DE10338743B4 (en) 2005-07-21
ATE524860T1 (en) 2011-09-15
EP1508947A1 (en) 2005-02-23

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