EP0311608A1 - Bougie d'allumage a section d'etincelle glissante. - Google Patents

Bougie d'allumage a section d'etincelle glissante.

Info

Publication number
EP0311608A1
EP0311608A1 EP87903248A EP87903248A EP0311608A1 EP 0311608 A1 EP0311608 A1 EP 0311608A1 EP 87903248 A EP87903248 A EP 87903248A EP 87903248 A EP87903248 A EP 87903248A EP 0311608 A1 EP0311608 A1 EP 0311608A1
Authority
EP
European Patent Office
Prior art keywords
platinum
layer
electrically conductive
spark plug
sliding
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
EP87903248A
Other languages
German (de)
English (en)
Other versions
EP0311608B1 (fr
Inventor
Karl-Hermann Friese
Werner Gruenwald
Kurt Schmid
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0311608A1 publication Critical patent/EP0311608A1/fr
Application granted granted Critical
Publication of EP0311608B1 publication Critical patent/EP0311608B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01T13/52—Sparking plugs characterised by a discharge along a surface

Definitions

  • the invention relates to a spark plug with sliding spark gap according to the preamble of the main claim.
  • a spark plug with a sliding spark gap is known, in which the isolator body is cross-divided and has a connection-side upper part made of a material with a relatively low dielectric constant and a lower part on the combustion chamber side made of a material with a much higher dielectric constant.
  • Such spark plugs are in perfect working order, but are relatively complicated to manufacture due to the divided insulating body.
  • the spark plug according to the invention with the characterizing features of the main claim has the advantage that it is easy to manufacture by thick-film technology and the sliding spark layers are highly effective and long-term stable.
  • the measures listed in the dependent claims are advantageous further developments and improvements in the main claim specified spark plug possible. It is particularly advantageous if the electrically non-conductive ceramic made of Al p Q and the electrically conductive layer on the ceramic made of platinum or a platinum-Al 0 mixture with 60 to 85% by weight? Platinum consists, while the layer of the sliding spark gap consists of a platinum-Al-O, mixture with 1.0 to 40% by weight? Platinum is made.
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
  • the figure shows an exemplary embodiment in a schematic, sectioned illustration.
  • the spark plug consists of a spark plug body 1 made of aluminum oxide, with a bore 2 in the part on the combustion chamber side, in which there is a T-shaped component which, for example, consists of aluminum oxide and has various surface coatings. With 4 the counter electrode is indicated.
  • the component 3 has a coating 5 inside the spark plug body 1 and inside the bore 2, and also protruding a little further, which is electrically conductive and consists either of platinum or of a platinum / Al O mixture with 60 to 85% by weight platinum and has a thickness of 5 to 15 ⁇ m.
  • the coating 6 on the component 3 in the vicinity of the counter electrode 4, to which this layer 6 makes the electrical contact, is made of the same material.
  • the electrically conductive coating 5 is contacted within the spark plug body 1 by means of an electrically conductive glass 7 in the form of a glass melt flow, as is known, for example, from US Pat. No. 3,909,459.
  • the sliding spark layer 8 between the coatings 5 and 6 consists of a platinum / Al 0 mixture with 10 to 40 wt. Platinum, which has the property after sintering, has no intrinsic conductivity, since individual conductivity islands are formed which, although they have no electrical contact with one another, nevertheless allow high displacement currents, which corresponds to a high dielectric constant.
  • This coating 8 is also applied in a thickness of 5 to 15 ⁇ m.
  • the T-shaped component 3 is first made from aluminum oxide and annealed at 1100 to 1150 ° C., but not yet sintered.
  • the electrically conductive coatings 5 and 6 and thereon are then immersed or printed onto this component 3 then apply the sliding spark layer 8 by printing or brushing on.
  • the component 3 with the coatings 5, 6 and 8 is then introduced from the inside into the bore 2 of the spark plug body 1, which has a diameter of just equal and which is also also only annealed Temperatures between 1500 and 1600 ° C. are sintered in the usual way, whereby a firm fit is created between component 3 and spark plug body 1 and the sliding spark layer 8 obtains the properties described above.
  • the electrically conductive glass 7 in is then inserted into the cavity of the spark plug body 1 Formed a glass melt flow and the upper Te not shown in the figure
  • the central electrode is introduced with the connection, whereupon the whole is melted at a melting temperature suitable for the respective glass type, which can be in the range between 800 and 900 ° C.
  • the whole is flared in a gas-tight manner in the spark plug housing, not shown, with the ground electrode 4 formed thereon, in such a way that the electrically conductive coating 6 and the counter electrode 4 touch.
  • Practical tests have shown that such spark plugs have a very long service life and the sliding spark layers are highly effective and long-term stable.

Abstract

Bougie d'allumage destinée à être utilisée dans un moteur à combustion interne, et comportant un corps isolant pourvu, dans sa partie terminale côté chambre de combustion, d'une électrode centrale reliée à une masse électroconductrice située à l'intérieur du corps isolant, ainsi qu'une contre-électrode et une section d'étincelle glissante entre l'électrode centrale et la contre-électrode. Les électrodes centrales et la section d'étincelle glissante sont constituées d'un élément céramique en une seule pièce électriquement non conducteur portant en surface, dans la région du corps isolant et de la contre-électrode, une couche électroconductrices, et dans la région de la section d'étincelle glissante, une couche qui, après vitrification, ne présente aucune conductivité intrinsèque et permet le passage de courants de déplacements élevés. L'élément céramique électriquement non conducteur se compose de préférence de Al2O3, la couche électroconductrice sur l'élément céramique se compose de platine ou d'un mélange de platine/Al2O3 avec au moins 60 % en poids de platine, et la couche de la section d'étincelle glissante se compose d'un mélange de platine/Al2O3 avec un maximum de 40 % en poids de platine.
EP19870903248 1986-06-12 1987-05-23 Bougie d'allumage a section d'etincelle glissante Expired - Lifetime EP0311608B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3619854 1986-06-12
DE19863619854 DE3619854A1 (de) 1986-06-12 1986-06-12 Zuendkerze mit gleitfunkenstrecke

Publications (2)

Publication Number Publication Date
EP0311608A1 true EP0311608A1 (fr) 1989-04-19
EP0311608B1 EP0311608B1 (fr) 1991-10-16

Family

ID=6302904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870903248 Expired - Lifetime EP0311608B1 (fr) 1986-06-12 1987-05-23 Bougie d'allumage a section d'etincelle glissante

Country Status (5)

Country Link
US (1) US4939409A (fr)
EP (1) EP0311608B1 (fr)
JP (1) JPH01502945A (fr)
DE (2) DE3619854A1 (fr)
WO (1) WO1987007778A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4089012B2 (ja) * 1997-09-24 2008-05-21 株式会社デンソー スパークプラグ
US6078130A (en) * 1997-11-10 2000-06-20 Altronic, Inc. Spark plug with specific construction to avoid unwanted surface discharge
AU1494599A (en) * 1997-12-17 1999-07-05 Dawson Royalties Limited Spark plug
US7224108B2 (en) * 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost spark plug manufactured from conductive loaded resin-based materials
EP1553671B1 (fr) * 2004-01-05 2007-05-09 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Bougie d'allumage
US20070188064A1 (en) * 2006-02-13 2007-08-16 Federal-Mogul World Wide, Inc. Metallic insulator coating for high capacity spark plug
US8278808B2 (en) * 2006-02-13 2012-10-02 Federal-Mogul Worldwide, Inc. Metallic insulator coating for high capacity spark plug
CN103229372A (zh) 2010-07-29 2013-07-31 美国辉门（菲德尔莫古）点火系统有限公司 用于与火花塞一起使用的电极材料
WO2012092432A1 (fr) 2010-12-29 2012-07-05 Federal-Mogul Ignition Company Élément d'allumage à effet de couronne doté d'une commande d'espacement améliorée
US8471451B2 (en) 2011-01-05 2013-06-25 Federal-Mogul Ignition Company Ruthenium-based electrode material for a spark plug
DE112012000600B4 (de) 2011-01-27 2018-12-13 Federal-Mogul Ignition Company Zündkerzenelektrode für eine Zündkerze, Zündkerze und Verfahren zum Herstellen einer Zündkerzenelektrode
WO2012116062A2 (fr) 2011-02-22 2012-08-30 Federal-Mogul Ignition Company Matériau d'électrode pour bougie d'allumage
WO2013003325A2 (fr) 2011-06-28 2013-01-03 Federal-Mogul Ignition Company Matériau d'électrode pour une bougie d'allumage
US10044172B2 (en) 2012-04-27 2018-08-07 Federal-Mogul Ignition Company Electrode for spark plug comprising ruthenium-based material
WO2013177031A1 (fr) 2012-05-22 2013-11-28 Federal-Mogul Ignition Company Procédé de fabrication de matériau à base de ruthénium pour une électrode de bougie d'allumage
US8979606B2 (en) 2012-06-26 2015-03-17 Federal-Mogul Ignition Company Method of manufacturing a ruthenium-based spark plug electrode material into a desired form and a ruthenium-based material for use in a spark plug
JP7022628B2 (ja) 2017-03-31 2022-02-18 株式会社Soken 内燃機関用のスパークプラグ
JP7194550B2 (ja) 2018-10-03 2022-12-22 株式会社Soken 内燃機関用のスパークプラグ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB645403A (en) * 1939-02-14 1950-11-01 Wijtze Beije Smits Improvements in or relating to sparking plugs
FR886454A (fr) * 1942-06-01 1943-10-15 Nouvelle bougie d'allumage
GB719628A (en) * 1951-10-09 1954-12-08 Plessey Co Ltd Improvements in or relating to sparking plug assemblies
DE2050330A1 (de) * 1970-10-14 1972-04-20 Daimler Benz Ag Gleitfunkenzündkerze
JPS5642981A (en) * 1979-09-14 1981-04-21 Ngk Spark Plug Co Inignition plug and production thereof
ZA805008B (en) * 1979-10-22 1981-08-26 Champion Spark Plug Co Spark igniter
DE3038720A1 (de) * 1980-10-14 1982-06-03 Robert Bosch Gmbh, 7000 Stuttgart Zuendkerze fuer brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8707778A1 *

Also Published As

Publication number Publication date
DE3619854A1 (de) 1987-12-17
DE3773936D1 (de) 1991-11-21
JPH01502945A (ja) 1989-10-05
US4939409A (en) 1990-07-03
EP0311608B1 (fr) 1991-10-16
WO1987007778A1 (fr) 1987-12-17

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