EP0452645A1 - Dispositif d'électrode d'allumage à chauffage électrique - Google Patents

Dispositif d'électrode d'allumage à chauffage électrique Download PDF

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Publication number
EP0452645A1
EP0452645A1 EP91103036A EP91103036A EP0452645A1 EP 0452645 A1 EP0452645 A1 EP 0452645A1 EP 91103036 A EP91103036 A EP 91103036A EP 91103036 A EP91103036 A EP 91103036A EP 0452645 A1 EP0452645 A1 EP 0452645A1
Authority
EP
European Patent Office
Prior art keywords
insulator
sleeve
electrode device
ignition electrode
heating winding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91103036A
Other languages
German (de)
English (en)
Inventor
Odd Karsten Dipl.-Ing. Peters
Roland Dipl.-Ing. Förster
Karl Dipl.-Ing. Möhle
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.)
BERU Ruprecht GmbH and Co KG
Beru Werk Albert Ruprecht GmbH and Co KG
Original Assignee
BERU Ruprecht GmbH and Co KG
Beru Werk Albert Ruprecht GmbH and Co KG
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 Ruprecht GmbH and Co KG, Beru Werk Albert Ruprecht GmbH and Co KG filed Critical BERU Ruprecht GmbH and Co KG
Publication of EP0452645A1 publication Critical patent/EP0452645A1/fr
Withdrawn legal-status Critical Current

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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
    • H01T13/02—Details
    • H01T13/18—Means for heating, e.g. for drying

Definitions

  • the invention relates to an electrically heatable ignition electrode device according to the preamble of patent claim 1.
  • An ignition electrode device - as a spark plug - this type is known from DE-OS 20 45 805.
  • the insulator is wrapped in a track defined by a helical recess with a heating wire, over which an insulating ceramic sleeve is pushed.
  • the heating winding and the ceramic sleeve surround only a part of the insulator that is remote from the center electrode, while the tip of the insulator in the combustion chamber is free. In this way, that part of the insulator surface on which the combustion residues - generally soot or a soot-fuel mixture - are deposited is only insufficiently and, above all, slowly heated.
  • a similarly constructed heated spark plug is known from DE-OS 22 35 370.
  • the part of the insulator which is remote from the tip is wound with a heating winding in predetermined helical recesses, the distance between the individual turns also being a multiple of the wire thickness.
  • the heating winding is surrounded on the outside by a ceramic mass applied by flame spraying.
  • the object of the invention is to design an electrically heated ignition electrode device of the type mentioned in such a way that the part of the insulator structure which is primarily loaded with combustion residues is heated more rapidly to temperatures which are closer to the temperature reached in the area of the coil winding.
  • the central electrode end of the ceramic sleeve becomes hotter than the insulator tip in the known heatable spark plugs for the same heating power.
  • the temperature of 600 ° C. and more necessary for burning off the combustion residues can be reached even with a lower heating output.
  • this temperature is reached faster than is the case in the prior art, where the heating-up time can be 10 minutes and more.
  • the heat transfer to the tip area of the insulator structure is further improved in that an intermediate space between the combustion chamber end of the sleeve and the insulator is filled with a glaze or kit layer.
  • the heating winding is formed by a prepared part with adjoining turns of oxide-layer insulated wire which can be pushed onto the insulator.
  • the specific heating power is maximized, on the one hand, and on the other hand, the heating winding can be prefabricated so that it can be pushed onto the insulator.
  • the heating winding extends to the middle electrode end of the insulator and the middle electrode end of the sleeve is drawn around the insulator to the center electrode. This further improves the heating of the surface that is loaded with deposits.
  • an insulator 2 is arranged in a housing body 1 made of metal, in which in turn a center electrode 5 is arranged, which protrudes with its tip from the insulator 2.
  • a heating winding 4 with closely adjacent turns made of oxide-layer insulated high-temperature resistant resistance wire is arranged, which is covered with a ceramic filling compound 9, for example made of baking soda or
  • Potash water glass and Al2O3 is embedded in a cylindrical ceramic sleeve 7 surrounding the heating winding, which extends from the housing body 1 over the entire protruding part of the insulator 2 to its center-electrode tip.
  • the heating winding 4 surrounds only part of the part of the insulator 2 protruding from the housing body 1 and leaves a space between the sleeve 7 and the insulator 2 on the tip side. This space is filled with an electrically insulating glaze or kit layer 6 in the region of the conically tapering end of the insulator.
  • the ceramic filling compound 9 extends behind it.
  • the heating winding 4 made of oxide-layer insulated high-temperature resistant resistance wire is prefabricated and is pushed as a whole onto the insulator. With this joining technique it is no longer necessary to use the insulator as a winding mandrel.
  • the end of the resistance wire on the middle electrode side which does not need to be wound bifilarly, is returned within the heating winding through a ceramic tube 8 to a connector plug 3 which is located in the region of the end of the ignition electrode device remote from the center electrode.
  • the other resistance wire end of the heating winding 4 is welded to the housing body 1 made of metal.
  • the sleeve 7 made of ceramic has a smooth surface, which favors a good jumping off of the deposit layer, which mostly consists of soot or a soot-fuel mixture or soot-fuel mixture.
  • the heating winding 4 extends into the area of the tip of the insulator 2.
  • the sleeve 7 made of ceramic at the end of the insulator 2 is drawn around the latter to the center electrode 5 and connected there by means of the glaze or kit layer 6.
  • Fig. 3 shows the temperature on the sleeve 7 in the area of the heating winding as a function of time for the embodiment according to FIG. 1 in comparison to a known structure which corresponds approximately to the spark plug of DE-OS 22 35 370.
  • the temperature of the latter was also measured in the area of the heating coil.
  • the heating power was about 60 watts in both cases.

Landscapes

  • Spark Plugs (AREA)
EP91103036A 1990-03-07 1991-02-28 Dispositif d'électrode d'allumage à chauffage électrique Withdrawn EP0452645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904007190 DE4007190C1 (fr) 1990-03-07 1990-03-07
DE4007190 1990-03-07

Publications (1)

Publication Number Publication Date
EP0452645A1 true EP0452645A1 (fr) 1991-10-23

Family

ID=6401628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91103036A Withdrawn EP0452645A1 (fr) 1990-03-07 1991-02-28 Dispositif d'électrode d'allumage à chauffage électrique

Country Status (2)

Country Link
EP (1) EP0452645A1 (fr)
DE (1) DE4007190C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0630086A1 (fr) * 1993-06-16 1994-12-21 NGK Spark Plug Co. Ltd. Bougie d'allumage munie d'un élément chauffant
WO2010148457A1 (fr) * 2009-06-26 2010-12-29 Orbital Australia Pty Limited Combustion de carburants à faible pression de vapeur dans des moteurs à allumage par étincelle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185529A (en) * 1986-01-16 1987-07-22 Nigel John Wilkinson Sparkplug

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2045805A1 (de) * 1970-09-16 1972-03-23 Eyquem Zündkerze fur einen Verbrennungs motor
DE7130903U (de) * 1971-08-12 1972-04-27 Beru-Werk A Ruprecht Zuendkerze mit eletrisch beheiztem isolatorfuss
DE2235370A1 (de) * 1972-07-19 1974-01-31 Daimler Benz Ag Elektrisch beheizte zuendkerze fuer brennkraftmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185529A (en) * 1986-01-16 1987-07-22 Nigel John Wilkinson Sparkplug

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0630086A1 (fr) * 1993-06-16 1994-12-21 NGK Spark Plug Co. Ltd. Bougie d'allumage munie d'un élément chauffant
WO2010148457A1 (fr) * 2009-06-26 2010-12-29 Orbital Australia Pty Limited Combustion de carburants à faible pression de vapeur dans des moteurs à allumage par étincelle

Also Published As

Publication number Publication date
DE4007190C1 (fr) 1991-09-26

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