EP0311608A1 - Spark plug with surface discharge section. - Google Patents
Spark plug with surface discharge section.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
Links
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims abstract description 3
- 238000005245 sintering Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 3
- 229910052593 corundum Inorganic materials 0.000 abstract 3
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 3
- 238000004017 vitrification Methods 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000012799 electrically-conductive coating Substances 0.000 description 2
- 239000000156 glass melt Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910018516 Al—O Inorganic materials 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
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.Spark plug intended for use in an internal combustion engine, and comprising an insulating body provided, in its end part on the combustion chamber side, with a central electrode connected to an electrically conductive ground located inside the insulating body, as well as a counter electrode and a sliding spark section between the central electrode and the counter electrode. The central electrodes and the sliding spark section are made of an electrically non-conductive one-piece ceramic element carrying on the surface, in the region of the insulating body and the counter electrode, an electrically conductive layer, and in the region of the sliding spark section, a layer which, after vitrification, has no intrinsic conductivity and allows the passage of high displacement currents. The electrically non-conductive ceramic element is preferably composed of Al2O3, the electrically conductive layer on the ceramic element consists of platinum or a mixture of platinum / Al2O3 with at least 60% by weight of platinum, and the layer of the Sliding spark section consists of a mixture of platinum / Al2O3 with a maximum of 40% by weight platinum.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3619854 | 1986-06-12 | ||
DE19863619854 DE3619854A1 (en) | 1986-06-12 | 1986-06-12 | SPARK PLUG WITH GLIDING RANGE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0311608A1 true EP0311608A1 (en) | 1989-04-19 |
EP0311608B1 EP0311608B1 (en) | 1991-10-16 |
Family
ID=6302904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870903248 Expired - Lifetime EP0311608B1 (en) | 1986-06-12 | 1987-05-23 | Spark plug with surface discharge section |
Country Status (5)
Country | Link |
---|---|
US (1) | US4939409A (en) |
EP (1) | EP0311608B1 (en) |
JP (1) | JPH01502945A (en) |
DE (2) | DE3619854A1 (en) |
WO (1) | WO1987007778A1 (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4089012B2 (en) * | 1997-09-24 | 2008-05-21 | 株式会社デンソー | Spark plug |
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 |
DE502004003751D1 (en) * | 2004-01-05 | 2007-06-21 | Ford Global Tech Llc | spark plug |
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 |
JP2013535786A (en) | 2010-07-29 | 2013-09-12 | フェデラル−モーグル・イグニション・カンパニー | Electrode material for use with spark plugs |
EP2659557B2 (en) | 2010-12-29 | 2019-01-16 | Federal-Mogul Ignition Company | Corona igniter having improved gap control |
US8471451B2 (en) | 2011-01-05 | 2013-06-25 | Federal-Mogul Ignition Company | Ruthenium-based electrode material for a spark plug |
WO2012102994A2 (en) | 2011-01-27 | 2012-08-02 | Federal-Mogul Ignition Company | Electrode material for a spark plug |
DE112012000947B4 (en) | 2011-02-22 | 2018-03-22 | Federal-Mogul Ignition Company | Method for producing an electrode material for a spark plug |
DE112012002699B4 (en) | 2011-06-28 | 2018-12-13 | Federal-Mogul Ignition Company | Spark plug and method of manufacturing an electrode of a spark plug |
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 (en) | 2017-03-31 | 2022-02-18 | 株式会社Soken | Spark plug for internal combustion engine |
JP7194550B2 (en) | 2018-10-03 | 2022-12-22 | 株式会社Soken | Spark plug for internal combustion engine |
Family Cites Families (7)
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 (en) * | 1942-06-01 | 1943-10-15 | New spark plug | |
GB719628A (en) * | 1951-10-09 | 1954-12-08 | Plessey Co Ltd | Improvements in or relating to sparking plug assemblies |
DE2050330A1 (en) * | 1970-10-14 | 1972-04-20 | Daimler Benz Ag | Sliding spark plug |
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 (en) * | 1980-10-14 | 1982-06-03 | Robert Bosch Gmbh, 7000 Stuttgart | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE |
-
1986
- 1986-06-12 DE DE19863619854 patent/DE3619854A1/en not_active Withdrawn
-
1987
- 1987-05-23 US US07/290,168 patent/US4939409A/en not_active Expired - Fee Related
- 1987-05-23 DE DE8787903248T patent/DE3773936D1/en not_active Expired - Lifetime
- 1987-05-23 EP EP19870903248 patent/EP0311608B1/en not_active Expired - Lifetime
- 1987-05-23 WO PCT/DE1987/000235 patent/WO1987007778A1/en active IP Right Grant
- 1987-05-23 JP JP62503147A patent/JPH01502945A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO8707778A1 * |
Also Published As
Publication number | Publication date |
---|---|
US4939409A (en) | 1990-07-03 |
DE3773936D1 (en) | 1991-11-21 |
WO1987007778A1 (en) | 1987-12-17 |
DE3619854A1 (en) | 1987-12-17 |
JPH01502945A (en) | 1989-10-05 |
EP0311608B1 (en) | 1991-10-16 |
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