EP0311608B1 - Bougie d'allumage a section d'etincelle glissante - Google Patents

Bougie d'allumage a section d'etincelle glissante Download PDF

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Publication number
EP0311608B1
EP0311608B1 EP19870903248 EP87903248A EP0311608B1 EP 0311608 B1 EP0311608 B1 EP 0311608B1 EP 19870903248 EP19870903248 EP 19870903248 EP 87903248 A EP87903248 A EP 87903248A EP 0311608 B1 EP0311608 B1 EP 0311608B1
Authority
EP
European Patent Office
Prior art keywords
platinum
electrode
discharge section
surface discharge
counter
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.)
Expired - Lifetime
Application number
EP19870903248
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German (de)
English (en)
Other versions
EP0311608A1 (fr
Inventor
Karl-Hermann Friese
Werner Grünwald
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
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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
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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
    • H01T13/52—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 sliding spark gap is known, in which the insulator 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 split insulator.
  • 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.
  • 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 embodiment in a schematic, sectional representation.
  • 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 3, which consists, for example, of aluminum oxide and has various surface coatings.
  • the counter electrode is indicated by 4.
  • the component 3 carries a coating 5 inside the spark plug body 1 and within the bore 2, as well as a little further, which is electrically conductive and consists either of platinum or of a platinum / Al 2 O 3 mixture 60 to 85 wt .-% platinum and has a thickness of 5 to 15 microns. This coating forms a central electrode.
  • the coating 6, which forms the counter electrode 4 is made of the same material from the other end of the flange part 3.
  • the counterelectrode is in electrical contact with the counterelectrode exclusion 4.
  • 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 / A] 2 0 3 mixture with 10 to 40 wt .-% platinum, which after sintering has the property of not having any intrinsic conductivity, since individual conductivity islands form have no electrical contact with each other, but 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 are then applied to this component 3 by dipping or printing and then by printing or brushing the sliding spark layer 8 applied.
  • 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 that is just right, and which is also only burned.
  • the whole is then sintered at temperatures between 1500 and 1600 ° C in the usual manner, with a firm fit being formed between component 3 and spark plug body 1 and the sliding spark layer 8 receiving the properties described above.
  • the electrically conductive glass 7 is then filled in the form of a glass melting foot and the connection of the center electrode, not shown in the figure, is introduced, whereupon the whole thing at a melting temperature suitable for the respective type of glass, which is in the range between 800 and 900 ° C may lie, is melted down. After cooling, the whole is crimped in a gas-tight manner into the spark plug housing (not shown) with the degenerate electrodes formed on it so that the counterelectrode 6 and the counterelectrode terminal 4 touch.

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  • Spark Plugs (AREA)

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.

Claims (3)

1. Bougie d'allumage à section d'étincelle glissante pour moteurs à combustion interne, avec un corps isolant (1), qui présente dans sa partie terminale du côté chambre de combustion une électrode médiane (5), qui est en relation avec une masse (7) électriquement conductrice présente à l'intérieur du corps isolant (1) et comprenant une contre-électrode (6) ainsi qu'une section d'étincelle glissante (8) entre l'électrode médiane et la contre-électrode, caractérisée en ce que l'électrode médiane (5) et la contre-électrode (6) sont constituées de couches électriquement conductrices, qui sont déposée sur les deux extrémités d'une pièce (3) constitutive en céramique, d'une pièce électriquement non conductrice, l'électrode médiane (5) pénétrant à l'intérieur du corps isolant (1) et la contre-électrode (6) étant reliée à une connexion de contre-électrode (4) et que la pièce constitutive en céramique porte dans la zone de la section d'étincelle glissante une couche (8) ne présentant pas de conductibilité électrique propre après le frittage, qui permet des courants élevés de déplacement.
2. Bougie d'allumage selon la revendication 1, caractérisée en ce que la pièce (3) constitutive en céramique non conductrice électriquement en Al2O3, les couches électriquement conductrices (5, 6) sur la céramique sont en platine ou en mélange pla- tinelA1203 comprenant au moins 60% en poids de Pt et la couche de la section d'étincelle glissante comprend un mélange platine/Al2O3 constituée au maximum de 40% en poids de Pt.
3. Bougie d'allumage selon la revendication 2, caractérisée en ce que les couches électriquement conductrices (5, 6) sur la pièce (3) constitutive en céramique sont en platine ou mélange platine/Al2O3 avec 60 à 85% en poids de platine et la couche (8) de la section d'étincelle glissante comprend un mélange de platine/A]203 avec de 10 à 40% en poids de Pt.
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 EP0311608A1 (fr) 1989-04-19
EP0311608B1 true 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
GB2346933A (en) * 1997-12-17 2000-08-23 Dawson Royalties Ltd Spark plug
US7224108B2 (en) * 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost spark plug manufactured from conductive loaded resin-based materials
DE502004003751D1 (de) * 2004-01-05 2007-06-21 Ford Global Tech Llc Zündkerze
US8278808B2 (en) * 2006-02-13 2012-10-02 Federal-Mogul Worldwide, Inc. Metallic insulator coating for high capacity spark plug
US20070188064A1 (en) * 2006-02-13 2007-08-16 Federal-Mogul World Wide, Inc. Metallic insulator coating for high capacity spark plug
US8436520B2 (en) 2010-07-29 2013-05-07 Federal-Mogul Ignition Company Electrode material for use with a spark plug
EP2659557B2 (fr) 2010-12-29 2019-01-16 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
US8760044B2 (en) 2011-02-22 2014-06-24 Federal-Mogul Ignition Company Electrode material for a spark plug
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
US8890399B2 (en) 2012-05-22 2014-11-18 Federal-Mogul Ignition Company Method of making ruthenium-based material for spark plug electrode
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

Also Published As

Publication number Publication date
JPH01502945A (ja) 1989-10-05
DE3619854A1 (de) 1987-12-17
EP0311608A1 (fr) 1989-04-19
DE3773936D1 (de) 1991-11-21
WO1987007778A1 (fr) 1987-12-17
US4939409A (en) 1990-07-03

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