EP0859437A1 - Method of fixing a ground electrode on a metallic shell of a spark plug - Google Patents

Method of fixing a ground electrode on a metallic shell of a spark plug Download PDF

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Publication number
EP0859437A1
EP0859437A1 EP98101913A EP98101913A EP0859437A1 EP 0859437 A1 EP0859437 A1 EP 0859437A1 EP 98101913 A EP98101913 A EP 98101913A EP 98101913 A EP98101913 A EP 98101913A EP 0859437 A1 EP0859437 A1 EP 0859437A1
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EP
European Patent Office
Prior art keywords
spark plug
plug body
ground electrode
electrode
fixing
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.)
Granted
Application number
EP98101913A
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German (de)
French (fr)
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EP0859437B1 (en
Inventor
Harald Knoll
Erwin Schneck
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.)
BorgWarner Ludwigsburg GmbH
Original Assignee
Beru 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 Beru AG filed Critical Beru AG
Publication of EP0859437A1 publication Critical patent/EP0859437A1/en
Application granted granted Critical
Publication of EP0859437B1 publication Critical patent/EP0859437B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs

Definitions

  • the invention relates to a method for attaching a In the form of a ring electrode or in the form of multi-pole side electrodes trained ground electrode on the metallic spark plug body a spark plug with axially arranged in the spark plug body Center electrode.
  • Spark plugs with axial in a metallic spark plug body arranged center electrode and a ground electrode, between them an ignition gap for the formation of an ignition spark form, are known per se and available on the market.
  • ground electrode is centric, i.e. concentric is attached to the axis of the spark plug body, otherwise the electrode spacing is uneven along the circumference of the ground electrode would.
  • the ground electrode by punching out a metallic Tape and prefabricated by appropriate shaping and then welded to the metallic spark plug body.
  • the ground electrode must be inside and be deburred on the outside, while still having problems with the centric Punch out and centrically weld on the ground electrode occur on the spark plug body.
  • These problems cause the ground electrode, especially at least the Drilling a ring electrode after attaching it to the spark plug body must be punched out to ensure the concentricity of the ground electrode especially the ring of the ring electrode to the axis of the spark plug body and thus a uniform electrode spacing ensure.
  • the object underlying the invention is therefore in developing the method of the type mentioned at the beginning, that there is a re-punching of the ground electrode after it is attached on the spark plug body.
  • This object is achieved according to the invention in that in the spark plug body a concentric to the axis of the spark plug body Centering groove is provided, welding cams on the prefabricated ground electrode and the ground electrode with the molded welding cams in the centering groove inserted in the spark plug body and welded to it.
  • the method according to the invention is suitable for spark plugs with ring electrode or multiple ground electrodes, in particular for two-, three- and four-pole spark plugs.
  • FIG. 1 is a partial sectional view of the electrode configuration a spark plug with a metallic spark plug body 1, in the center of a ceramic insulator 2 is arranged.
  • the insulator 2 is above the front edge of the spark plug body 1 into the combustion chamber of the internal combustion engine in front.
  • a center electrode 3 is provided, which together with a Ring electrode formed ground electrode 4 an ignition gap ZS for the formation of an ignition spark.
  • the ground electrode 4 is electrically connected to and encloses the spark plug body 1 the entire circumference of the center electrode 3.
  • ground electrode 4 formed as a ring electrode and the to ensure opposite end of the center electrode 3 it is necessary that the ground electrode 4 is exactly concentric to the axis of the spark plug or the spark plug body 1 on this is appropriate.
  • spark plug body 1 to the axis of the spark plug body 1 and thus centering groove concentric with the axis of the center electrode 3 11 trained.
  • the ground electrode 4 is, for example prefabricated by punching out of a metal band and attached their feet with sweat cams that are molded onto them will. The ground electrode 4 is then in with the welding cams the centering groove 11 provided in the spark plug body 1 is used and welded to it.
  • centering groove 11 Due to the formation of the centering groove 11 is a precise and simple centering of the ground electrode 4 on the spark plug body 1 ensures that the ground electrode is complete can be prefabricated and re-punched after they have been attached on the spark plug body 1 is omitted.
  • the welds on the prefabricated ground electrode 4 still do not have to be deburred, because welding cams on it are provided, the material of which is welded into the centering groove 11 flows.
  • the above procedure involves fewer operations and leads due to the central assembly of the ground electrode 4 into one uniform electrode spacing and for uniform heat dissipation.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)

Abstract

The procedure is for mounting an earth electrode (4) designed as a ring electrode or multipole side electrodes onto a metal spark plug body (1) with an axial centre electrode. The spark plug body has a centring groove (11) that is concentric to the axis. Welding cams are formed on the prefabricated earth electrode. The earth electrode is then inserted into the centring groove and welded to it.

Description

Die Erfindung betrifft ein Verfahren zum Anbringen einer in Form einer Ringelektrode oder in Form von mehrpoligen Seitenelektroden ausgebildeten Masseelektrode am metallischen Zündkerzenkörper einer Zündkerze mit axial im Zündkerzenkörper angeordneter Mittelelektrode.The invention relates to a method for attaching a In the form of a ring electrode or in the form of multi-pole side electrodes trained ground electrode on the metallic spark plug body a spark plug with axially arranged in the spark plug body Center electrode.

Zündkerzen mit axial in einem metallischen Zündkerzenkörper angeordneter Mittelelektrode und einer Masseelektrode, die dazwischen einen Zündspalt für die Ausbildung eines Zündfunkens bilden, sind an sich bekannt und auf dem Markt erhältlich.Spark plugs with axial in a metallic spark plug body arranged center electrode and a ground electrode, between them an ignition gap for the formation of an ignition spark form, are known per se and available on the market.

Bei der Fertigung derartiger Zündkerzen ist es von besonderer Bedeutung, daß die Masseelektrode zentrisch, d.h. konzentrisch zur Achse des Zündkerzenkörpers angebracht wird, da sonst der Elektrodenabstand längs des Umfangs der Masseelektrode ungleichmäßig würde.It is special in the manufacture of such spark plugs Meaning that the ground electrode is centric, i.e. concentric is attached to the axis of the spark plug body, otherwise the electrode spacing is uneven along the circumference of the ground electrode would.

Üblicherweise wird bei der Herstellung von derartigen Zündkerzen die Masseelektrode durch Ausstanzen aus einem metallischen Band und durch eine entsprechende Formgebung vorgefertigt und anschließend an den metallischen Zündkerzenkörper angeschweißt. Dabei muß die Masseelektrode allerdings innen und außen entgratet werden, wobei weiterhin Probleme mit dem zentrischen Ausstanzen und dem zentrischen Aufschweißen der Masseelektrode auf den Zündkerzenkörper auftreten. Diese Probleme führen dazu, daß die Masseelektrode, insbesondere wenigstens die Bohrung einer Ringelektrode nach ihrem Anbringen am Zündkerzenkörper nachgestanzt werden muß, um die Konzentrizität der Masseelektrode insbesondere des Ringes der Ringelektrode zur Achse des Zündkerzenkörpers und damit einen gleichmäßigen Elektrodenabstand sicherzustellen.Usually used in the manufacture of such spark plugs the ground electrode by punching out a metallic Tape and prefabricated by appropriate shaping and then welded to the metallic spark plug body. However, the ground electrode must be inside and be deburred on the outside, while still having problems with the centric Punch out and centrically weld on the ground electrode occur on the spark plug body. These problems cause the ground electrode, especially at least the Drilling a ring electrode after attaching it to the spark plug body must be punched out to ensure the concentricity of the ground electrode especially the ring of the ring electrode to the axis of the spark plug body and thus a uniform electrode spacing ensure.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, das Verfahren der eingangs genannten Art so auszubilden, daß sich ein Nachstanzen der Masseelektrode nach ihrem Anbringen an dem Zündkerzenkörper erübrigt.The object underlying the invention is therefore in developing the method of the type mentioned at the beginning, that there is a re-punching of the ground electrode after it is attached on the spark plug body.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß im Zündkerzenkörper eine zur Achse des Zündkerzenkörpers konzentrische Zentrierungsrille vorgesehen wird, Schweißnocken an der vorgefertigten Masseelektrode angeformt werden und die Masseelektrode mit den angeformten Schweißnocken in die Zentrierungsrille im Zündkerzenkörper eingesetzt und damit verschweißt wird.This object is achieved according to the invention in that in the spark plug body a concentric to the axis of the spark plug body Centering groove is provided, welding cams on the prefabricated ground electrode and the ground electrode with the molded welding cams in the centering groove inserted in the spark plug body and welded to it.

Bei dem erfindungsgemäßen Verfahren ist eine einfache Zentrierung der Masseelektrode auf dem Zündkerzenkörper mittels der darin vorgesehenen Zentrierungsrille möglich, so daß die Masseelektrode fertig vorgestanzt werden kann und ein Nachstanzen nach dem Anbringen der Masseelektrode am Zündkerzenkörper entfällt. Es ist auch kein Entgraten der Schweißstellen der vorgefertigten Masseelektroden notwendig, da das Material der angeformten Schweißnocken beim Schweißen in die Zentrierungsrille fließt.In the method according to the invention there is a simple centering the ground electrode on the spark plug body using the provided centering groove possible, so that the ground electrode can be pre-punched and post-punched after attaching the ground electrode to the spark plug body. There is also no deburring of the welds on the prefabricated ones Ground electrodes necessary because the material of the molded Welding cams when welding into the centering groove flows.

Das erfindungsgemäße Verfahren eignet sich für Zündkerzen mit Ringelektrode oder mehrfachen Masseelektroden, insbesondere für zwei-, drei- und vierpolige Zündkerzen.The method according to the invention is suitable for spark plugs with ring electrode or multiple ground electrodes, in particular for two-, three- and four-pole spark plugs.

Im folgenden wird anhand der zugehörigen Zeichnung ein besonders bevorzugtes Ausführungsbeispiel des erfindungsgemäßen Verfahrens näher beschrieben. Es zeigen

  • Fig. 1 eine Teilschnittansicht der zündseitigen Elektrodenkonfiguration einer Zündkerze und
  • Fig. 2 eine schematische Teilschnittansicht des zündseitigen Teils einer Zündkerze zur Erläuterung des erfindungsgemäßen Verfahrens.
    • A particularly preferred exemplary embodiment of the method according to the invention is described in more detail below with reference to the accompanying drawing. Show it
  • Fig. 1 is a partial sectional view of the ignition-side electrode configuration of a spark plug and
  • Fig. 2 is a schematic partial sectional view of the ignition-side part of a spark plug to explain the method according to the invention.

    • In Fig. 1 ist in einer Teilschnittansicht die Elektrodenkonfiguration einer Zündkerze mit einem metallischen Zündkerzenkörper 1 dargestellt, in dem zentrisch ein keramischer Isolator 2 angeordnet ist. Der Isolator 2 steht über den vorderen Rand des Zündkerzenkörpers 1 hinaus in den Brennraum der Brennkraftmaschine vor. Im keramischen Isolator 2 ist axial oder mittig eine Mittelelektrode 3 vorgesehen, die zusammen mit einer als Ringelektrode ausgebildeten Masseelektrode 4 einen Zündspalt ZS für die Ausbildung eines Zündfunkens bildet. Die Masseelektrode 4 ist elektrisch mit dem Zündkerzenkörper 1 verbunden und umschließt den gesamten Umfang der Mittelelektrode 3.1 is a partial sectional view of the electrode configuration a spark plug with a metallic spark plug body 1, in the center of a ceramic insulator 2 is arranged. The insulator 2 is above the front edge of the spark plug body 1 into the combustion chamber of the internal combustion engine in front. In the ceramic insulator 2 is axial or central a center electrode 3 is provided, which together with a Ring electrode formed ground electrode 4 an ignition gap ZS for the formation of an ignition spark. The ground electrode 4 is electrically connected to and encloses the spark plug body 1 the entire circumference of the center electrode 3.

    Um einen gleichmäßigen Elektrodenabstand zwischen dem Ring der als Ringelektrode ausgebildeten Masseelektrode 4 und dem gegenüber liegenden Ende der Mittelelektrode 3 zu gewährleisten ist es erforderlich, daß die Masseelektrode 4 genau konzentrisch zur Achse der Zündkerze oder des Zündkerzenkörpers 1 an diesem angebracht ist.To keep the electrodes even between the rings the ground electrode 4 formed as a ring electrode and the to ensure opposite end of the center electrode 3 it is necessary that the ground electrode 4 is exactly concentric to the axis of the spark plug or the spark plug body 1 on this is appropriate.

    Wie es in Fig. 2 dargestellt ist, wird zu diesem Zweck im Zündkerzenkörper 1 eine zur Achse des Zündkerzenkörpers 1 und somit zur Achse der Mittelelektrode 3 konzentrische Zentrierungsrille 11 ausgebildet. Die Masseelektrode 4 wird beispielsweise durch Ausstanzen aus einem Metallband vorgefertigt und an ihren Füßen mit Schweißnocken versehen, die daran angeformt werden. Die Masseelektrode 4 wird dann mit den Schweißnocken in die im Zündkerzenkörper 1 vorgesehene Zentrierungsrille 11 eingesetzt und damit verschweißt.As shown in Fig. 2, for this purpose Spark plug body 1 to the axis of the spark plug body 1 and thus centering groove concentric with the axis of the center electrode 3 11 trained. The ground electrode 4 is, for example prefabricated by punching out of a metal band and attached their feet with sweat cams that are molded onto them will. The ground electrode 4 is then in with the welding cams the centering groove 11 provided in the spark plug body 1 is used and welded to it.

    Durch die Ausbildung der Zentrierungsrille 11 ist eine genaue und einfache Zentrierung der Masseelektrode 4 am Zündkerzenkörper 1 sichergestellt, so daß die Masseelektrode komplett vorgefertigt werden kann und ein Nachstanzen nach ihrem Anbringen am Zündkerzenkörper 1 entfällt.Due to the formation of the centering groove 11 is a precise and simple centering of the ground electrode 4 on the spark plug body 1 ensures that the ground electrode is complete can be prefabricated and re-punched after they have been attached on the spark plug body 1 is omitted.

    Die Schweißstellen an der vorgefertigten Masseelektrode 4 müssen weiterhin nicht entgratet werden, da daran Schweißnocken vorgesehen sind, deren Material beim Schweißen in die Zentrierungsrille 11 fließt.The welds on the prefabricated ground electrode 4 still do not have to be deburred, because welding cams on it are provided, the material of which is welded into the centering groove 11 flows.

    Das obige Verfahren umfaßt weniger Arbeitsgänge und führt infolge der zentrischen Montage der Masseelektrode 4 zu einem gleichmäßigen Elektrodenabstand und zu einer gleichmäßigen Wärmeabführung.The above procedure involves fewer operations and leads due to the central assembly of the ground electrode 4 into one uniform electrode spacing and for uniform heat dissipation.

    Claims (1)

    Verfahren zum Anbringen einer in Form einer Ringelektrode oder in Form von mehrpoligen Seitenelektroden ausgebildeten Masseelektrode an einen metallischen Zündkerzenkörper eine Zündkerze mit axial im Zündkerzenkörper angeordneter Mittelelektrode, dadurch gekennzeichnet, daß im Zündkerzenkörper eine zur Achse des Zündkerzenkörpers konzentrische Zentrierungsrille vorgesehen wird, Schweißnocken an der vorgefertigten Masseelektrode angeformt werden und die Masseelektrode mit den angeformten Schweißnocken in die Zentrierungsrille im Zündkerzenkörper eingesetzt und damit verschweißt wird. Method for attaching a ground electrode designed in the form of a ring electrode or in the form of multi-pole side electrodes to a metallic spark plug body, a spark plug with a central electrode arranged axially in the spark plug body, characterized in that a centering groove which is concentric with the axis of the spark plug body is provided in the spark plug body, Welding cams are formed on the prefabricated ground electrode and the ground electrode with the molded welding cams is inserted into the centering groove in the spark plug body and is welded to it.
    EP98101913A 1997-02-12 1998-02-04 Method of fixing a ground electrode on a metallic shell of a spark plug Expired - Lifetime EP0859437B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19705373A DE19705373C2 (en) 1997-02-12 1997-02-12 Method of attaching a ground electrode to the spark plug body of a spark plug
    DE19705373 1997-02-12

    Publications (2)

    Publication Number Publication Date
    EP0859437A1 true EP0859437A1 (en) 1998-08-19
    EP0859437B1 EP0859437B1 (en) 2001-05-16

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    Application Number Title Priority Date Filing Date
    EP98101913A Expired - Lifetime EP0859437B1 (en) 1997-02-12 1998-02-04 Method of fixing a ground electrode on a metallic shell of a spark plug

    Country Status (4)

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    EP (1) EP0859437B1 (en)
    AT (1) ATE201289T1 (en)
    DE (2) DE19705373C2 (en)
    ES (1) ES2157098T3 (en)

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2000077901A1 (en) * 1999-06-16 2000-12-21 Alliedsignal Inc. Spark plug shell having a bimetallic ground electrode, spark plug incorporating the shell, and method of making same
    US10826279B1 (en) 2019-08-28 2020-11-03 Federal-Mogul Ignition Llc Spark plug ground electrode configuration

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US6080029A (en) 1999-08-05 2000-06-27 Halo, Inc. Method of manufacturing a spark plug with ground electrode concentrically disposed to a central electrode
    DE102006033578A1 (en) * 2006-07-20 2008-01-31 Beru Ag Ignition device, in particular spark plug for an internal combustion engine and method for positioning at least one ground electrode in the ignition device
    DE102006041161A1 (en) * 2006-09-01 2008-03-06 Bayerische Motoren Werke Ag Spark plug for a hydrogen internal combustion engine

    Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2360279A (en) * 1942-04-22 1944-10-10 Gen Motors Corp Method of making spark plugs
    US2377481A (en) * 1943-03-23 1945-06-05 Robert K Christie Method of gapping spark plugs
    US5408961A (en) * 1993-08-09 1995-04-25 Innovative Automative Technologies Int. Ltd. Ignition plug

    Patent Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2360279A (en) * 1942-04-22 1944-10-10 Gen Motors Corp Method of making spark plugs
    US2377481A (en) * 1943-03-23 1945-06-05 Robert K Christie Method of gapping spark plugs
    US5408961A (en) * 1993-08-09 1995-04-25 Innovative Automative Technologies Int. Ltd. Ignition plug

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2000077901A1 (en) * 1999-06-16 2000-12-21 Alliedsignal Inc. Spark plug shell having a bimetallic ground electrode, spark plug incorporating the shell, and method of making same
    US10826279B1 (en) 2019-08-28 2020-11-03 Federal-Mogul Ignition Llc Spark plug ground electrode configuration

    Also Published As

    Publication number Publication date
    DE59800707D1 (en) 2001-06-21
    DE19705373C2 (en) 2000-02-03
    EP0859437B1 (en) 2001-05-16
    ATE201289T1 (en) 2001-06-15
    ES2157098T3 (en) 2001-08-01
    DE19705373A1 (en) 1998-08-20

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