WO2008055483A1 - Dispositif d'allumage, en particulier bougie d'allumage pour moteur à combustion interne, et procédé pour sa fabrication - Google Patents

Dispositif d'allumage, en particulier bougie d'allumage pour moteur à combustion interne, et procédé pour sa fabrication Download PDF

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Publication number
WO2008055483A1
WO2008055483A1 PCT/DE2007/001992 DE2007001992W WO2008055483A1 WO 2008055483 A1 WO2008055483 A1 WO 2008055483A1 DE 2007001992 W DE2007001992 W DE 2007001992W WO 2008055483 A1 WO2008055483 A1 WO 2008055483A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
ignition device
ground
spark plug
noble metal
Prior art date
Application number
PCT/DE2007/001992
Other languages
German (de)
English (en)
Inventor
Werner Niessner
Christophe Houlle
Original Assignee
Beru Aktiengesellschaft
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 Aktiengesellschaft filed Critical Beru Aktiengesellschaft
Priority to DE112007003254T priority Critical patent/DE112007003254A5/de
Publication of WO2008055483A1 publication Critical patent/WO2008055483A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/39—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
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • 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

  • Ignition device in particular spark plug for an internal combustion engine and method of manufacture
  • the invention relates to an ignition device for igniting combustible mixtures, in particular a spark plug for generating the spark for a, in particular gas-fired internal combustion engine according to the preamble of patent claim 1 and a method for producing a spark plug.
  • a spark plug from DE 101 29 040 which comprises a region with a step-shaped cross-sectional change of the ground electrode.
  • an ignition device in particular a spark plug, with at least two ground electrodes fixed in the same bending height with respect to the tip of the center electrode is known, in which several types of discharge take place.
  • a high voltage is applied between the center electrode and the at least two ground electrodes, a first discharge is performed, the so-called air spark, at a first wide spark gap between the center electrode facing end surface of the ground electrode and the outer surface of the center electrode.
  • a second discharge takes place at a second wide spark gap, the so-called air sliding spark, between the ground electrode, the insulating member and the center electrode.
  • the invention is based on this prior art, the task of providing an ignition device for an internal combustion engine, which has a long service life in a simplified and cost-effective production, and to provide an economically optimized method for inexpensive precious metal reinforcement of a mass and / or center electrode in the ignition device ,
  • an ignition device for an internal combustion engine comprising:
  • An electrical insulation layer which is arranged centrally in the spark plug body,
  • a center electrode which is arranged centrally in the insulating element and projects from the tip of the insulating element and at least one
  • the ignition device according to the invention can be used for example in a gas-powered industrial engine with a high compression pressure.
  • the ignition device according to the invention has considerable advantages over the prior art, because spark gaps projecting far into the combustion space without thermal overheating or vibration fractures at the ground electrode can be realized by the frontal application of a noble metal tip .
  • a further significant advantage of the ignition device according to the invention is then that, in the case of the height-offset arrangement of the ground electrodes, a nearly 360 ° burnup surface can preferably be provided on the lateral surface of the center electrode.
  • mutual contact between the ground electrodes is essentially ruled out. With the enlargement of the Abbrand designs the spark exit surface is simultaneously increased and thus achieved an increased life
  • the electrode spacing between each ground electrode and the center electrode is set so that it is substantially equal.
  • the electrode spacing is preferably in the micrometer range to avoid undesirable misfire. Since the inventive ignition device requires a high discharge voltage, this small micrometer range satisfies the requirement for stable operation without misfire
  • the center electrode and the ground electrodes are formed substantially of a non-noble metal
  • the center electrode and the ground electrodes consist essentially of a nickel-based alloy, comprising elements such as Al, Si, Mn, Cr, Y, Hf.
  • nickel-based alloys comprising elements such as Al, Si, Mn, Cr, Y, Hf.
  • each end face of the ground electrode of the lateral surface of the center electrode is opposite and the electrode distance is less than the distance of the ground electrode to the isoher element.
  • the electrode spacing between each ground electrode and the center electrode is substantially equidistant. This leads to a uniform burn of the ground electrodes and the center electrode.
  • a micrometre reduced electrode spacing between the ground electrode and center electrode is possible, which can lead to a reduction in the voltage requirement increase over time.
  • the spark is formed directly as air sparks A gliding of the air spark on the toe of the insulating does not take place
  • the electrode spacing is approximately between 200 .mu.m to 600 .mu.m, preferably at 300 .mu.m.
  • the small electrode spacing in the micrometer range is of great importance in particular for ignition devices for use in gas-operated industrial engines with high compression pressures, since a particularly small electrode spacing leads to a reduction in the discharge voltage requirement
  • the electrode spacing can be readjusted by bending the ground electrodes. The advantage of this embodiment allows a readjustment to small electrode spacings, preferably 300 .mu.m, during engine operation at regular intervals of maintenance. A repeated use of these ignition devices is given.
  • each ground electrode forms an air gap with the center electrode over the electrode gap.
  • the height-offset arrangement of the ground electrode pairs preferably results in at least four air gaps ranging in size between 200 .mu.m and 600 .mu.m, preferably 300 .mu.m.
  • the distance between the air gap between the ground electrode and the center electrode corresponds essentially to the distance between the electrodes.
  • a significant advantage of the method according to the invention is that can be set by the erfi ⁇ dungssiee positioning of the ground electrode pairs predefined electrode distances in the micrometer range cost and with a minimum of process steps.
  • the small electrode spacings in conjunction with an increase in burnup area allow for an increase in the life of the igniter without the use of precious metals.
  • a further advantage of the method according to the invention is that the height-offset attachment of the laterally arranged ground electrodes makes it possible to use a large burnup area, which makes it possible to reduce the rise in the voltage requirement over the runtime.
  • the object of the invention shows the significant advantage that the electrode spacing can also be readjusted by attaching lateral ground electrodes.
  • a substantially equal electrode spacing is formed between each ground electrode and the center electrode.
  • the electrode spacing is set between 200 ⁇ m and 600 ⁇ m, preferably 300 ⁇ m, to avoid misfire. Since the ignition device according to the invention enables a low discharge voltage, the requirement for stable operation without misfire is met by means of an electrode spacing of between 200 ⁇ m and 600 ⁇ m.
  • the ground electrodes are bent in such a way that the electrode spacing is readjusted.
  • the advantage of the erfg ⁇ dungsg ⁇ mä touch method allows in motor operation, as needed, a readjustment to small micro-scale electrode distances, preferably 300 .mu.m, so that low raw emissions are possible until the end of life.
  • the ignition devices according to the invention can be used several times with the ground electrodes positioned according to the invention.
  • An advantage of this embodiment is that a uniform erosion of the ground electrodes and the center electrode takes place.
  • Figure 1 A schematic view of a spark plug device with a laterally arranged
  • Figure 2 1 A schematic representation of a cross-sectional view of a combustion chamber end of an ignition device with two laterally arranged ground electrodes
  • FIG. 3 The stepwise formation of an electrode with a noble metal tip
  • FIG. 4 reinforcement of the electrode
  • FIG. 5 Side electrode variants
  • Figure 6 an embodiment with stainless steel sleeve
  • the ignition device 10 has a cylindrical spark plug body 1 made of metal, in which a ceramic insulating element 2 is arranged centrally. From the insulating member 2, the tip of the center electrode 3 formed of a non-noble metal projects into the combustion chamber (not shown) of the internal combustion engine.
  • the ceramic insulating member 2 includes the center electrode 3 of the igniter.
  • the center electrode 3 is disposed axially in the ceramic insulating member 2 and protrudes from the toe of the insulating member 2. Through the center electrode 3, the center axis of the ignition device runs centrally.
  • a ground electrode 4 is mounted such that the leading end is fixed to the end face of the cylindrical spark plug body 1 by welding.
  • the ground electrode 4 formed of a non-noble metal, made of a nickel-based alloy, electrode wire z. B. used with dimensions of the order of 1.7mm x 2.7mm. After welding, the ground electrode 4 is bent in the direction of the center axis of the ignition device such that the ground electrode is positioned at the same bending height with respect to the tip 5 of the center electrode 3.
  • the invention is not limited only to the examples described, but other ground electrodes can z B arranged offset in height with respect to the tip of the center electrode
  • ground electrodes are arranged offset on the end face of the cylindrical spark plug body to another than 90 ° or 60 ° -W ⁇ nkel
  • electrode wires with other dimensions can be used for the ground electrodes.
  • the stamp with which the Masseeie- electrodes are punched have different diameters
  • the invention is generally applicable to igniters
  • Figure 1 shows a partial view of the spark plug according to the invention, which consists essentially of a metallic body (1), a ceramic insulator (2), a center electrode (3) and a ground electrode (4).
  • the ground electrode (4) is designed as a side electrode and forms a spark gap (EA) with the center electrode (3).
  • the center electrode (3) is centrally inserted in the insulator (2) and pressure-tightly embedded in the step-shaped insulator bore by means of an electrically conductive glass mass, not shown, and a firing pin.
  • the center electrode (3) is formed with an annular shaped tip, the so-called corona tip (9).
  • the center electrode (3) looks in the zund solution end and is provided at the end with a noble metal tip (5).
  • the noble metal tip can consist of a platinum or lithium alloy ,
  • the noble metal tip (5) is connected to the center electrode (3) by means of an alloying zone (7).
  • the alloying zone (7) is formed by laser welding.
  • the alloy zone (7) compensates for the different coefficients of linear expansion of the two metals nickel alloy from the center electrode (3) and indium or platinum alloys from the noble metal tip (5), so that during engine operation no stress cracks occur in the joint plane and therefore premature end of life is avoided.
  • the ground electrode (4) is formed from a round wire (0 1, 5 - 2,0 mm) and bent in the direction of spark plugs central axis to the noble metal tip (5) of the center electrode (3) in the form of a side electrode
  • the ground electrode (4) is zün technology verünt and
  • the precious metal tip (6) is welded onto the ground electrode (4) by means of a laser welding, so ) and the ground electrode (4) forms an alloying zone (8) for the purpose of compensating for the different coefficient of longitudinal expansion of the nickel base alloy of the ground electrode (4) and iridium or platinum alloy of the noble metal tip (6)
  • the noble metal tips (5) of the center electrode (3) and the noble metal tip (6) of the ground electrode (4) form a spark gap (EA).
  • the ground electrode (4) is above the Isolatorfußspitze (10) with the distance G, wherein the distance G is always greater than the electrode spacing (EA).
  • FIG. 2 shows a spark plug having the features of FIG.
  • the spark plug according to the invention in FIG. 2 differs essentially from the spark plug described in FIG. 1 in that it is formed with at least one additional auxiliary electrode (11).
  • the auxiliary electrode is arranged to form a sliding air gap (GLF) with the center electrode (12).
  • the sliding air gap (GLF) consists of a sliding spark gap (GF) and a Lucasfun kenstreck ⁇ (LF).
  • the center electrode (12) is cylindrical in the region of the insulator bore (13) and tapers only outside the insulator bore (13). This geometry ensures that the sparks are formed at the appropriate engine operating state or contaminated insulator foot tips on the sliding air gap (GLF).
  • the distance between the sliding air gap section (GLF) is greater than the air gap gap (EA).
  • the air gap (LF) of the sliding air gap (GLF) is smaller than the air gap of the center electrode (12) and the ground electrode (4).
  • the distance G between the lower edge of the ground electrode (4) and the Isolatorfußspitze is greater than that of the air gap (EA) of the center electrode (12) and the ground electrode (4).
  • FIG. 3 shows the production sequence when attaching the noble metal tip (6) to the ground electrode (4).
  • the noble metal tip (6) is applied to the ground electrode (4) in such a way that the noble metal tip (6) in the form of a blank (15) is applied on the end face (14) of the ground electrode (4).
  • the ground electrode (4) has the geometric shape of a round wire instead of conventional flat wires. This allows a mechanical processing, for example by means of turning.
  • a tapered step (16) is mounted on the end face (14) a Ronde (15) is applied by means of resistance welding.
  • the step (16) which receives the blank (15) is larger in diameter than the blank (16).
  • an alloy zone (8) is produced by laser welding between the blank (15) and the step (16) of the center electrode (4), and the ground electrode (4) is formed with a noble metal tip (6).
  • the ground electrode (4) with the noble metal tip (6) can then be welded onto the body (1) and bent. Furthermore, FIG.
  • FIG. 1 shows a spark plug with a noble-metal-reinforced center electrode (3) and a noble-metal-reinforced ground electrode (4) in the form of a side electrode, wherein the noble metal reinforcement (6) is welded onto the side electrode on the front side.
  • an alloy zone (8) is formed between precious metal (6) and ground electrode (4).
  • the alloy zone (8) is formed for example by means of beam welding, preferably by laser welding.
  • the ground electrode (4) consists of a round wire.
  • the ground electrode (4) is tapered on the ignition side and provided with a step ((16).
  • the center electrode (3) is formed with a noble metal tip (5) and a Al istszo ⁇ e (7).
  • the distance G which is shown in Figures 1 and 2, is greater than the air gap (EA).
  • An additional auxiliary electrode (11) can be seen in an alternative embodiment in Figure 2.
  • the distance of the sliding air gap (GLF), as shown in FIG. 2, is greater than the air gap (EA).
  • the air gap (LF) of the sliding air gap (GLF) is smaller than the air gap (EA) between the center electrode (12) and the ground electrode (4).
  • the distance G between the lower edge of the ground electrode (4) and the Isolatorfußspitze is greater than that of the air gap (EA) of the center electrode (12) and the ground electrode (4).
  • FIG. 4 shows a further manufacturing possibility of the noble metal reinforcement on the ground electrode. This provides that on the end face of the ground electrode, a noble metal piece is welded as described below:
  • the noble metal piece in FIG. 5 can be applied to the end face in the form of a round blank, a cylindrical wire piece, a rivet form or as a ball (with subsequent flat embossing), preferably by means of resistance welding.
  • a radiation welding process preferably a laser welding process, is additionally used.
  • FIG. 6 shows a spark plug with stainless-steel-reinforced electrodes 3, 4.
  • the center electrode 3 has a tubular sleeve 5, which is friction-welded, for example.
  • Such a sleeve 5 can also be arranged on the sides and / or auxiliary electrode.

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

Abstract

L'invention concerne un dispositif d'allumage pour moteur à combustion interne, lequel dispositif comprend au moins un corps de bougie d'allumage en un matériau électriquement conducteur, au moins un élément électriquement isolant disposé au centre du corps de bougie d'allumage, au moins une électrode centrale disposée au centre dans l'élément isolant et débordant de la pointe du pied de l'élément isolant et au moins une électrode de masse placée latéralement par rapport à l'électrode centrale et reliée au corps de bougie d'allumage. L'électrode de masse et/ou l'électrode centrale présentent une armature en métal précieux.
PCT/DE2007/001992 2006-11-08 2007-11-06 Dispositif d'allumage, en particulier bougie d'allumage pour moteur à combustion interne, et procédé pour sa fabrication WO2008055483A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112007003254T DE112007003254A5 (de) 2006-11-08 2007-11-06 Zündeinrichtung, insbesondere Zündkerze für eine Verbrennungskraftmaschine und Verfahren zur Herstellung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006052930 2006-11-08
DE102006052930.8 2006-11-08

Publications (1)

Publication Number Publication Date
WO2008055483A1 true WO2008055483A1 (fr) 2008-05-15

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PCT/DE2007/001992 WO2008055483A1 (fr) 2006-11-08 2007-11-06 Dispositif d'allumage, en particulier bougie d'allumage pour moteur à combustion interne, et procédé pour sa fabrication

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DE (1) DE112007003254A5 (fr)
WO (1) WO2008055483A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010014325A1 (de) * 2010-04-09 2011-10-13 Borgwarner Beru Systems Gmbh Verfahren zum Herstellen einer Zündkerze und dadurch hergestellte Zündkerze
DE102013102592A1 (de) * 2013-03-14 2014-10-02 Borgwarner Beru Systems Gmbh Koronazündeinrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859436A1 (fr) * 1997-02-12 1998-08-19 Beru AG Bougie d'allumage pour moteur à combustion interne et sa méthode de fabrication
DE10131391A1 (de) * 2000-06-29 2002-02-07 Denso Corp Motorzündkerze für Kogenerationssystem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859436A1 (fr) * 1997-02-12 1998-08-19 Beru AG Bougie d'allumage pour moteur à combustion interne et sa méthode de fabrication
DE10131391A1 (de) * 2000-06-29 2002-02-07 Denso Corp Motorzündkerze für Kogenerationssystem

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010014325A1 (de) * 2010-04-09 2011-10-13 Borgwarner Beru Systems Gmbh Verfahren zum Herstellen einer Zündkerze und dadurch hergestellte Zündkerze
US8471449B2 (en) 2010-04-09 2013-06-25 Federal-Mogul Ignition Gmbh Attaching a precious metal component to spark plug electrode and spark plug having the same
DE102010014325B4 (de) 2010-04-09 2018-07-05 Federal-Mogul Ignition Gmbh Verfahren zum Herstellen einer Zündkerze und dadurch hergestellte Zündkerze
DE102013102592A1 (de) * 2013-03-14 2014-10-02 Borgwarner Beru Systems Gmbh Koronazündeinrichtung
DE102013102592B4 (de) * 2013-03-14 2015-01-22 Borgwarner Ludwigsburg Gmbh Koronazündeinrichtung mit bedeckter Zündspitze
US9373941B2 (en) 2013-03-14 2016-06-21 Borgwarner Ludwigsburg Gmbh Corona ignition device

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Publication number Publication date
DE112007003254A5 (de) 2009-10-22

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