EP2761710B1 - Improved spark plug - Google Patents

Improved spark plug Download PDF

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Publication number
EP2761710B1
EP2761710B1 EP12751279.6A EP12751279A EP2761710B1 EP 2761710 B1 EP2761710 B1 EP 2761710B1 EP 12751279 A EP12751279 A EP 12751279A EP 2761710 B1 EP2761710 B1 EP 2761710B1
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EP
European Patent Office
Prior art keywords
diameter
noble metal
spark plug
electrode
pin
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Active
Application number
EP12751279.6A
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German (de)
French (fr)
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EP2761710A1 (en
Inventor
Detlef Hartmann
Dietrich Trachte
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2761710A1 publication Critical patent/EP2761710A1/en
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Publication of EP2761710B1 publication Critical patent/EP2761710B1/en
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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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • 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
    • H01T13/39—Selection of materials for electrodes
    • 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
    • H01T15/00—Circuits specially adapted for spark gaps, e.g. ignition circuits

Definitions

  • the present invention relates to an improved spark plug in a so-called pin-to-pin arrangement with significantly improved wear behavior.
  • Spark plugs are known from the prior art in various configurations, for example from the EP 1 353 423 A2 .
  • spark plugs with a so-called roof electrode in which the ground electrode is arranged in the axial direction of the spark plug above the center electrode, usually noble metal-containing pins, so-called pins, used to improve the service life of the spark plug.
  • These precious metal pencils have very good corrosion and erosion resistance.
  • the noble metal pins can be applied, for example, by welding to the respective carrier electrodes.
  • the noble metal pins are usually cylindrical and designed such that a larger of the two pin diameters is applied to the ground electrode and the smaller of the pin diameters is arranged at the center electrode.
  • the diameters of the precious metal pins are the same size.
  • single-filament coils are usually used, in which the center electrode is provided as a cathode. It has now been found that a greater wear on the center electrode than at the Ground electrode in a wear ratio of 1/3 to 2/3 is present.
  • the noble metal pins are very expensive components of the spark plugs, it would be desirable to have electrodes which have the most uniform possible wear over the life of the spark plug.
  • the spark plug according to the invention with the features of claim 1 has the advantage over that wear of noble metal pins on the center electrode and the ground electrode over the entire life of the spark plug is the same. This results in optimal utilization of expensive precious metal materials in the precious metal pins and in particular a prolonged service life of the spark plugs.
  • This is inventively achieved in that the center electrode and the ground electrode are arranged in a frontally opposite arrangement (so-called pin-to-pin arrangement).
  • the noble metal pin has a larger diameter at the center electrode than the noble metal pin at the ground electrode.
  • an optimal utilization of the precious metal is achieved according to the invention.
  • tolerances with regard to overlapping of the electrodes can be compensated by the larger diameter of the center electrode.
  • a ratio V of a diameter of the center electrode to a diameter of the ground electrode is between 1.25 ⁇ V ⁇ 1.35.
  • the diameters of the center electrode and the ground electrode at the front end portions of the noble metal pins in a range of 0.4 mm to 1.5 mm, preferably between 0.4 mm and 0.9 mm.
  • the invention relates to an ignition device comprising a spark plug according to the invention and a Einzelfunkenzündspule, wherein the center electrode is arranged as a cathode.
  • FIG. 1 a spark plug 1 according to a preferred embodiment of the invention described in detail.
  • the spark plug 1 comprises a ground electrode 2 in the form of a roof electrode and a center electrode 3. At the ground electrode 2, a noble metal pin 20 is arranged. At the center electrode 3, a noble metal pin 30 is also arranged. The two noble metal pins 20, 30 are arranged in an end face facing each other orientation (so-called pin-to-pin arrangement).
  • the spark plug 1 further includes an insulator 4 and a spark plug housing 5.
  • the noble metal pin 20 of the ground electrode to the noble metal pin 30 of the center electrode 3 is arranged such that the center axes X and Y of the noble metal pins coincide. Furthermore, the noble metal pin 30 of the center electrode 3 has a diameter D1, which is greater than a diameter D2 of the noble metal pin 20 of the ground electrode 2.
  • a diameter D1 of the noble metal pin 20 of the ground electrode 2 has a diameter D1 which is greater than a diameter D2 of the noble metal pin 20 of the ground electrode 2.
  • a diameter D1 of the center electrode 3 is 0.8 mm and a diameter D2 of the noble metal pin 20 of the ground electrode 3 is 0.6 mm.
  • the diameter at the center electrode 3 is about 1.33 times larger than the diameter D2 at the ground electrode 2.
  • the diameter D1 at the center electrode is 1.00 mm and the diameter D2 at the ground electrode is 0.8 mm, so that the diameter of the center electrode 3 is 1.25 times the diameter D2 of the ground electrode 2.
  • the inventive measure of providing a noble metal pin 30 at the center electrode 3 with a larger diameter than at the ground electrode 2 in a pin-to-pin arrangement an improved life of the spark plug can be achieved.
  • a more uniform wear of the two noble metal pins 20, 30 on the electrodes can be made possible.
  • an optimum design of the spark plug with respect to the expensive noble metal can be made possible, whereby the manufacturing cost of the spark plugs according to the invention can be significantly reduced.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft eine verbesserte Zündkerze in einer sogenannten Pin-to-Pin-Anordnung mit deutlich verbessertem Verschleißverhalten.The present invention relates to an improved spark plug in a so-called pin-to-pin arrangement with significantly improved wear behavior.

Zündkerzen sind aus dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt, beispielsweise aus der EP 1 353 423 A2 . Bei bekannten Zündkerzen mit einer sogenannten Dachelektrode, bei der die Masseelektrode in Axialrichtung der Zündkerze über der Mittelelektrode angeordnet ist, werden üblicherweise Edelmetall enthaltende Stifte, sogenannte Pins, verwendet, um die Standzeiten der Zündkerze zu verbessern. Diese Edelmetallstifte besitzen dabei sehr gute Korrosions- und Erosionsbeständigkeiten. Durch die einander gegenüberliegende Anordnung der Edelmetallstifte an der Mittelelektrode und der Masseelektrode ist ferner eine sehr gute Entflammung des Kraftstoffgemisches gewährleistet. Die Edelmetallstifte können beispielsweise durch Schweißen auf die jeweiligen Trägerelektroden aufgebracht werden. Die Edelmetallstifte sind üblicherweise zylinderförmig und derart gestaltet, dass ein größerer der beiden Stiftdurchmesser auf der Masseelektrode aufgebracht ist und der kleinere der Stiftdurchmesser an der Mittelelektrode angeordnet ist. Durch diese Maßnahme wird eine sichere Überdeckung zwischen dem Edelmetallstift der Mittelelektrode und dem der Masseelektrode erreicht, so dass auch fertigungsbedingte Toleranzen sowie Toleranzen bei der Montage kompensiert werden können.Spark plugs are known from the prior art in various configurations, for example from the EP 1 353 423 A2 , In known spark plugs with a so-called roof electrode, in which the ground electrode is arranged in the axial direction of the spark plug above the center electrode, usually noble metal-containing pins, so-called pins, used to improve the service life of the spark plug. These precious metal pencils have very good corrosion and erosion resistance. By the opposing arrangement of the noble metal pins on the center electrode and the ground electrode also a very good ignition of the fuel mixture is ensured. The noble metal pins can be applied, for example, by welding to the respective carrier electrodes. The noble metal pins are usually cylindrical and designed such that a larger of the two pin diameters is applied to the ground electrode and the smaller of the pin diameters is arranged at the center electrode. By this measure, a secure overlap between the noble metal pin of the center electrode and the ground electrode is achieved, so that manufacturing tolerances and tolerances in the assembly can be compensated.

Alternativ sind die Durchmesser der Edelmetallstifte gleich groß. Ferner werden in modernen Brennkraftmaschinen üblicherweise Einzelfunkenspulen verwendet, bei denen die Mittelelektrode als Kathode vorgesehen ist. Hierbei hat sich nun herausgestellt, dass ein größerer Verschleiß an der Mittelelektrode als an der Masseelektrode in einem Verschleißverhältnis von 1/3 zu 2/3 vorliegt. Da die Edelmetallstifte jedoch sehr teure Bestandteile der Zündkerzen sind, wäre es wünschenswert, Elektroden zu haben, welche über die Gesamtlebensdauer der Zündkerze einen möglichst gleichmäßigen Verschleiß aufweisen.Alternatively, the diameters of the precious metal pins are the same size. Furthermore, in modern internal combustion engines single-filament coils are usually used, in which the center electrode is provided as a cathode. It has now been found that a greater wear on the center electrode than at the Ground electrode in a wear ratio of 1/3 to 2/3 is present. However, since the noble metal pins are very expensive components of the spark plugs, it would be desirable to have electrodes which have the most uniform possible wear over the life of the spark plug.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Zündkerze mit den Merkmalen des Anspruchs 1 weist dem gegenüber den Vorteil auf, dass ein Verschleiß von Edelmetallstiften an der Mittelelektrode und der Masseelektrode über die gesamte Lebensdauer der Zündkerze gleich ist. Hierdurch ergibt sich eine optimale Ausnutzung der teueren Edelmetallwerkstoffe in den Edelmetallstiften und insbesondere eine verlängerte Lebensdauer der Zündkerzen. Dies wird erfindungsgemäß dadurch erreicht, dass die Mittelelektrode und die Masseelektrode in einer einander stirnseitig gegenüberliegenden Anordnung angeordnet sind (sogenannte Pin-to-Pin-Anordnung). Dabei weist der Edelmetallstift an der Mittelelektrode einen größeren Durchmesser auf als der Edelmetallstift an der Masseelektrode. Ferner wird erfindungsgemäß eine optimale Ausnutzung des Edelmetalls erzielt.The spark plug according to the invention with the features of claim 1 has the advantage over that wear of noble metal pins on the center electrode and the ground electrode over the entire life of the spark plug is the same. This results in optimal utilization of expensive precious metal materials in the precious metal pins and in particular a prolonged service life of the spark plugs. This is inventively achieved in that the center electrode and the ground electrode are arranged in a frontally opposite arrangement (so-called pin-to-pin arrangement). In this case, the noble metal pin has a larger diameter at the center electrode than the noble metal pin at the ground electrode. Furthermore, an optimal utilization of the precious metal is achieved according to the invention.

Weiterhin können durch den größer gewählten Durchmesser der Mittelelektrode auch Toleranzen hinsichtlich einer Überdeckung der Elektroden kompensiert werden.Furthermore, tolerances with regard to overlapping of the electrodes can be compensated by the larger diameter of the center electrode.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.

Ein Verhältnis V eines Durchmessers der Mittelelektrode zu einem Durchmesser der Masseelektrode liegt zwischen 1,25 ≤ V ≤ 1,35. Durch die Einhaltung dieses Größenverhältnisses kann ein besonders minimierter Verschleiß zwischen den beiden Edelmetallstiften der Elektroden erreicht werden.A ratio V of a diameter of the center electrode to a diameter of the ground electrode is between 1.25 ≦ V ≦ 1.35. By adhering to this size ratio, a particularly minimized wear between the two noble metal pins of the electrodes can be achieved.

Weiter bevorzugt liegen die Durchmesser der Mittelelektrode und der Masseelektrode an den stirnseitigen Endbereichen der Edelmetallstifte in einem Bereich von 0,4 mm bis 1,5 mm, vorzugsweise zwischen 0,4 mm und 0,9 mm.More preferably, the diameters of the center electrode and the ground electrode at the front end portions of the noble metal pins in a range of 0.4 mm to 1.5 mm, preferably between 0.4 mm and 0.9 mm.

Ferner betrifft die Erfindung eine Zündvorrichtung, umfassend eine erfindungsgemäße Zündkerze sowie eine Einzelfunkenzündspule, wobei die Mittelelektrode als Kathode angeordnet ist.Furthermore, the invention relates to an ignition device comprising a spark plug according to the invention and a Einzelfunkenzündspule, wherein the center electrode is arranged as a cathode.

Kurze Beschreibung der ZeichnungShort description of the drawing

Nachfolgend wird unter Bezug auf die begleitende Zeichnung ein Ausführungsbeispiel der Erfindung im Detail beschrieben.Hereinafter, an embodiment of the invention will be described in detail with reference to the accompanying drawings.

In der Zeichnung ist:

Figur 1
eine schematische, teilweise geschnittene Darstellung einer Zündkerze gemäß einem bevorzugten Ausführungsbeispiel der Erfindung.
In the drawing is:
FIG. 1
a schematic, partially sectioned view of a spark plug according to a preferred embodiment of the invention.

Bevorzugte Ausführungsform der ErfindungPreferred embodiment of the invention

Nachfolgend wird unter Bezugnahme auf Figur 1 eine Zündkerze 1 gemäß einem bevorzugten Ausführungsbeispiel der Erfindung im Detail beschrieben.The following is with reference to FIG. 1 a spark plug 1 according to a preferred embodiment of the invention described in detail.

Die Zündkerze 1 umfasst eine Masseelektrode 2 in Form einer Dachelektrode und eine Mittelelektrode 3. An der Masseelektrode 2 ist ein Edelmetallstift 20 angeordnet. An der Mittelelektrode 3 ist ebenfalls ein Edelmetallstift 30 angeordnet. Die beiden Edelmetallstifte 20, 30 sind dabei in einer stirnseitig zueinander gerichteten Ausrichtung angeordnet (sogenannte Pin-to-Pin-Anordnung). Die Zündkerze 1 umfasst ferner einen Isolator 4 und ein Zündkerzengehäuse 5.The spark plug 1 comprises a ground electrode 2 in the form of a roof electrode and a center electrode 3. At the ground electrode 2, a noble metal pin 20 is arranged. At the center electrode 3, a noble metal pin 30 is also arranged. The two noble metal pins 20, 30 are arranged in an end face facing each other orientation (so-called pin-to-pin arrangement). The spark plug 1 further includes an insulator 4 and a spark plug housing 5.

Wie aus Figur 1 ersichtlich ist, ist der Edelmetallstift 20 der Masseelektrode zum Edelmetallstift 30 der Mittelelektrode 3 derart angeordnet, dass die Mittelachsen X und Y der Edelmetallstifte zusammenfallen. Weiterhin weist der Edelmetallstift 30 der Mittelelektrode 3 einen Durchmesser D1 auf, welcher größer ist als ein Durchmesser D2 des Edelmetallstifts 20 der Masseelektrode 2. Somit kann sicher eine Überdeckung auch unter Berücksichtigung von herstellungsbedingten und/oder montagebedingten Toleranzen sichergestellt werden. Hierdurch wird eine sichere und gleichmäßige Entflammbarkeit eines Kraftstoffgemischs erreicht. Gleichzeitig wird ein gleichmäßigerer Verschleiß an den beiden Edelmetallstiften 20, 30 der Elektroden erreicht.How out FIG. 1 is apparent, the noble metal pin 20 of the ground electrode to the noble metal pin 30 of the center electrode 3 is arranged such that the center axes X and Y of the noble metal pins coincide. Furthermore, the noble metal pin 30 of the center electrode 3 has a diameter D1, which is greater than a diameter D2 of the noble metal pin 20 of the ground electrode 2. Thus, an overlap can certainly be ensured even taking into account production-related and / or assembly-related tolerances. This will achieved a safe and uniform flammability of a fuel mixture. At the same time a more uniform wear on the two noble metal pins 20, 30 of the electrodes is achieved.

In diesem Ausführungsbeispiel beträgt ein Durchmesser D1 der Mittelelektrode 3 0,8 mm und ein Durchmesser D2 des Edelmetallstiftes 20 der Masseelektrode 3 beträgt 0,6 mm. Somit ist der Durchmesser an der Mittelelektrode 3 ca. 1,33 mal größer als der Durchmesser D2 an der Masseelektrode 2. Alternativ beträgt der Durchmesser D1 an der Mittelelektrode 1,00 mm und der Durchmesser D2 an der Masseelektrode 0,8 mm, so dass der Durchmesser der Mittelelektrode 3 das 1,25-fache des Durchmessers D2 der Masseelektrode 2 beträgt.In this embodiment, a diameter D1 of the center electrode 3 is 0.8 mm and a diameter D2 of the noble metal pin 20 of the ground electrode 3 is 0.6 mm. Thus, the diameter at the center electrode 3 is about 1.33 times larger than the diameter D2 at the ground electrode 2. Alternatively, the diameter D1 at the center electrode is 1.00 mm and the diameter D2 at the ground electrode is 0.8 mm, so that the diameter of the center electrode 3 is 1.25 times the diameter D2 of the ground electrode 2.

Somit kann auf überraschende Weise durch die erfindungsgemäße Maßnahme des Vorsehens eines Edelmetallstifts 30 an der Mittelelektrode 3 mit einem größeren Durchmesser als an der Masseelektrode 2 bei einer Pin-to-Pin-Anordnung eine verbesserte Lebensdauer der Zündkerze erreicht werden. Insbesondere kann ein gleichmäßigerer Verschleiß der beiden Edelmetallstifte 20, 30 an den Elektroden ermöglicht werden. Somit kann eine optimale Auslegung der Zündkerze hinsichtlich des teuren Edelmetalls ermöglicht werden, wodurch die Herstellungskosten für die erfindungsgemäßen Zündkerzen signifikant reduziert werden können.Thus, in a surprising manner, the inventive measure of providing a noble metal pin 30 at the center electrode 3 with a larger diameter than at the ground electrode 2 in a pin-to-pin arrangement, an improved life of the spark plug can be achieved. In particular, a more uniform wear of the two noble metal pins 20, 30 on the electrodes can be made possible. Thus, an optimum design of the spark plug with respect to the expensive noble metal can be made possible, whereby the manufacturing cost of the spark plugs according to the invention can be significantly reduced.

Claims (3)

  1. Spark plug for an internal combustion engine, comprising:
    - a centre electrode (3), on which a first noble metal pin (30) of a first diameter (D1) is arranged, and
    - an earth electrode, on which a noble metal pin (20) of a second diameter (D2) is arranged,
    - wherein the noble metal pins of the centre electrode (3) and the earth electrode (2) are arranged such that the end faces thereof face one another, and
    - wherein the first diameter (D1) of the centre electrode (3) is greater than the second diameter (D2) of the earth electrode (2),
    characterized in that
    a ratio V of the first diameter (D1) to the second diameter (D2) lies between 1.25 ≤ V ≤ 1.35.
  2. Spark plug according to Claim 1, characterized in that a measure of the first diameter (D1) and/or of the second diameter (D2) is greater than 0.4 mm and less than 1.5 mm and, in particular, greater than 0.4 mm and less than 0.9 mm.
  3. Ignition device, comprising a spark plug according to one of the preceding claims and a single-spark ignition coil, wherein the centre electrode (3) is arranged as a cathode.
EP12751279.6A 2011-09-28 2012-08-03 Improved spark plug Active EP2761710B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011083640A DE102011083640A1 (en) 2011-09-28 2011-09-28 Improved spark plug
PCT/EP2012/065279 WO2013045145A1 (en) 2011-09-28 2012-08-03 Improved spark plug

Publications (2)

Publication Number Publication Date
EP2761710A1 EP2761710A1 (en) 2014-08-06
EP2761710B1 true EP2761710B1 (en) 2016-10-12

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ID=46754395

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12751279.6A Active EP2761710B1 (en) 2011-09-28 2012-08-03 Improved spark plug

Country Status (5)

Country Link
US (1) US9391429B2 (en)
EP (1) EP2761710B1 (en)
JP (1) JP2014528145A (en)
DE (1) DE102011083640A1 (en)
WO (1) WO2013045145A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105164876A (en) * 2013-04-17 2015-12-16 日本特殊陶业株式会社 Spark plug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1353423A2 (en) * 2002-04-10 2003-10-15 Denso Corporation Spark plug for internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05335066A (en) 1992-06-01 1993-12-17 Nippondenso Co Ltd Spark plug for internal combustion engine
US6111345A (en) 1996-08-29 2000-08-29 Denso Corporation Spark plug for apparatus for detecting ion current without generating spike-like noise on the ion current
JP2000243536A (en) 1999-02-18 2000-09-08 Ngk Spark Plug Co Ltd Spark plug and ignition system for internal combustion engine
JP2002184551A (en) 2000-10-03 2002-06-28 Nippon Soken Inc Spark plug and ignition device using same
JP2006120649A (en) 2000-10-03 2006-05-11 Nippon Soken Inc Spark plug and ignition apparatus utilizing the same
DE602004030401D1 (en) * 2003-09-27 2011-01-20 Ngk Spark Plug Co spark plug
JP4928596B2 (en) 2009-12-04 2012-05-09 日本特殊陶業株式会社 Spark plug and manufacturing method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1353423A2 (en) * 2002-04-10 2003-10-15 Denso Corporation Spark plug for internal combustion engine

Also Published As

Publication number Publication date
US20140320010A1 (en) 2014-10-30
DE102011083640A1 (en) 2013-03-28
US9391429B2 (en) 2016-07-12
EP2761710A1 (en) 2014-08-06
WO2013045145A1 (en) 2013-04-04
JP2014528145A (en) 2014-10-23

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