EP0268598B1 - Bougie d'allumage a intervalle de decharge glissant - Google Patents
Bougie d'allumage a intervalle de decharge glissant Download PDFInfo
- Publication number
- EP0268598B1 EP0268598B1 EP87902423A EP87902423A EP0268598B1 EP 0268598 B1 EP0268598 B1 EP 0268598B1 EP 87902423 A EP87902423 A EP 87902423A EP 87902423 A EP87902423 A EP 87902423A EP 0268598 B1 EP0268598 B1 EP 0268598B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spark plug
- insulating body
- combustion chamber
- plug according
- dielectric coating
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000007750 plasma spraying Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920002050 silicone resin Polymers 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims 23
- 239000011248 coating agent Substances 0.000 claims 16
- 230000015556 catabolic process Effects 0.000 description 4
- 239000011224 oxide ceramic Substances 0.000 description 4
- 229910052574 oxide ceramic Inorganic materials 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 3
- VKJLWXGJGDEGSO-UHFFFAOYSA-N barium(2+);oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[O-2].[Ti+4].[Ba+2] VKJLWXGJGDEGSO-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000156 glass melt Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- H01T13/32—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
- H01T13/00—Sparking plugs
- H01T13/52—Sparking plugs characterised by a discharge along a surface
Definitions
- the invention relates to a spark plug with a sliding spark gap for internal combustion engines according to the preamble of claim 1.
- Such spark plugs with sliding spark gaps which form on the combustion chamber-side surface of the insulating body between the center and ground electrodes, are distinguished by an ignition voltage that is substantially lower than that of a spark plug with air spark gap. It has been shown that the higher the dielectric constant of the insulating body material, the lower the ignition voltage.
- such an insulating body made of high-dielectric material leads to a relatively high capacity in a spark plug, which causes a breakdown discharge at the sliding spark gap.
- the surfaces of the electrodes and especially the slideway of the spark gap are severely eroded, which in turn significantly impairs the proper functioning of the spark plug and its service life.
- EP-A-0.236.376 forms a state of the art according to Article 54 (3) EPC. Overall, however, the total capacity of the spark plug cannot be kept small enough, so that the energy still causes significant erosion in the insulating body surface in breakdown phases that sometimes occur.
- the spark plug according to the invention with the characterizing features of claim 1 has the advantage that the coaxial layer structure of the insulating body or candle block results in a coaxial capacitor with a layered dielectric, the total capacity of which is due to the smaller capacitance of the low-dielectric layer, i.e. the layer with the much smaller one Dielectric constant is determined. Without increasing the candle capacity, ceramics with a relative dielectric constant of up to 10,000 can therefore be used in the high-dielectric layer if only the low-dielectric layer has a relatively small dielectric constant of approximately 10 to 50.
- the spark plug according to the invention if an advantageously high-dielectric slideway is provided, has only a small plug capacity and, as a result, shows only slight erosions on the slideway. Due to the high dielectric constant of the insulating body surface on which the slideway is formed, the ignition voltage requirement of the spark plug is low, so that a considerable part of the energy made available by the ignition system is transferred to the fuel mixture. This creates good ignition conditions even for lean fuel mixtures. Due to the low ignition voltage requirement, all advantages of a low-voltage ignition, such as a smaller ignition coil, good interference suppression, and low expenditure on high-voltage insulation result.
- Fig. 1 to 6 each have a spark plug half in side view and half cut longitudinally according to six different embodiments.
- the spark plugs for internal combustion engines shown in the drawing all have an insulating body 10, which is enclosed on a longitudinal section by a metallic plug housing 11.
- the plug housing 11 carries an external thread 13 on an end section 12 with a reduced diameter by means of which the spark plug is inserted into a cylinder head of the internal combustion engine, not shown, is screwed in.
- a hexagon key 14 is used for screwing in.
- the end section 12 carries an annular ground electrode 15 on its end face projecting into the combustion chamber of the internal combustion engine.
- the rotationally symmetrical insulating body 10 which has a central axial through bore 16, projects out of the candle housing 11 on both sides thereof.
- a metallic connecting bolt 17 is arranged within the through bore 16 and carries a connecting piece 18 for the electrical connection of the spark plug to the ignition system at its end section remote from the combustion chamber.
- the connecting bolt 17 and the center electrode 19 are conductively connected to one another by a glass melt flow mass 20.
- the insulating body 10 has, at least in the end section on the combustion chamber side, two coaxial material layers with completely different dielectric constants which lie completely or partially against one another in the radial direction.
- the relative dielectric constant of the materials used is between 10 and 10,000, preferably between 50 and 5000.
- the materials used in the two material layers are paired in such a way that the difference between their dielectric constants is as large as possible.
- the insulating body 10 consists essentially of a completely continuous base body 21 made of aluminum oxide ceramic with a relatively low dielectric constant (less than 15), and a sleeve 22 made of high-dielectric material pushed open from the end of the base body 21 on the combustion chamber side. e.g. B. barium titanium oxide (Ba2 Ti03), with a relative dielectric constant of approx. 5000.
- the base body 21 is reduced in diameter via an end section on the combustion chamber side.
- the sleeve 22 extends from the front end of the base body 21 over almost the entire overlap area of the candle housing 11, while in FIG.
- the sleeve 22 covers the base body 21 only in the combustion chamber end of the insulating body 10 and approximately in the middle of the end section 12 of the candle housing 11 ends.
- the annular end face of the sleeve 22 remote from the combustion chamber is covered by a radially projecting shoulder of the base body 21.
- a high-voltage-resistant annular insulating disk 23 made of silicone or epoxy resin is inserted.
- the end faces of the base body 21 and the sleeve 22 on the combustion chamber side are covered by an end face 24, which is made of the same material as the central electrode 19 and is conductively connected to it.
- the sleeve 22 can be omitted and the high-dielectric layer directly on the insulating body 10 made of aluminum oxide ceramic, for. B. be applied by plasma spraying.
- the high-dielectric layer or layers on the insulating body 10 exclusively in the slideway area between the end face 24 of the center electrode 19 and the ground electrode 15.
- the base body 21 and the sleeve 22 do not run coaxially to one another as far as the front end of the insulating body 10 on the combustion chamber side, but only overlap in the axial direction, the base body 21 being at a distance from the end of the insulating body 10 on the combustion chamber side ends within the encompassing area of the candle housing 11, while the sleeve 22 extends to the free end.
- the central electrode 19 is widened down to the sleeve 22, so that the sleeve 22 directly surrounds the base body 21 on a longitudinal section and directly surrounds the central electrode 19 on a further longitudinal section adjoining the combustion chamber.
- the insulating body 10 in turn has a base body 25 made of aluminum oxide ceramic, which contains the through-bore 16 and ends within the metallic plug housing 11. At a distance from the end of the base body 25 on the combustion chamber side, the diameter of the through hole is enlarged.
- a hollow pin 26 made of highly dielectric material is inserted into this cylinder ring, which remains between the center electrode 19 and the base body 25, so that it surrounds the end region of the center electrode 19 on the one hand and is enclosed by the base body 25 over a longitudinal section.
- the central electrode 19 and the connecting pin 17 are not connected to one another via a glass melt flow mass, but are separated from one another by a highly insulating separating layer 27, which is pierced by a contact pin 28 for the electrically conductive connection of connecting pin 17 and central electrode 19.
- Electrode in the end area on the combustion chamber is similar to that of the spark plug in FIG. 3.
- the diameter of the center electrode 19 in turn increases in the end section on the combustion chamber side.
- the hollow pin 26 is here funnel-shaped and in turn surrounds the center electrode 19 up to its end on the combustion chamber side. Its outer circumference is aligned with the outer circumference of the base body 25.
Landscapes
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863616668 DE3616668A1 (de) | 1986-05-16 | 1986-05-16 | Zuendkerze mit gleitfunkenstrecke |
DE3616668 | 1986-05-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0268598A1 EP0268598A1 (fr) | 1988-06-01 |
EP0268598B1 true EP0268598B1 (fr) | 1989-12-20 |
Family
ID=6301045
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87902423A Expired EP0268598B1 (fr) | 1986-05-16 | 1987-05-06 | Bougie d'allumage a intervalle de decharge glissant |
Country Status (8)
Country | Link |
---|---|
US (1) | US4870319A (fr) |
EP (1) | EP0268598B1 (fr) |
JP (1) | JPS63503418A (fr) |
KR (1) | KR880701479A (fr) |
BR (1) | BR8707310A (fr) |
DE (2) | DE3616668A1 (fr) |
ES (1) | ES2005229A6 (fr) |
WO (1) | WO1987007094A1 (fr) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2219041A (en) * | 1988-05-28 | 1989-11-29 | Ford Motor Co | Spark plug |
DE68905734T2 (de) * | 1988-08-25 | 1993-07-08 | Ngk Spark Plug Co | Verfahren zum formen keramischer isolatoren fuer die verwendung in zuendkerzen. |
JP2625307B2 (ja) * | 1992-01-28 | 1997-07-02 | 日本特殊陶業株式会社 | スパークプラグ |
DE4331269C2 (de) * | 1993-09-15 | 1995-07-13 | Bosch Gmbh Robert | Verfahren zur Herstellung einer Zündkerze mit Gleitfunkenstrecke und nach den Verfahren hergestellte Zündkerzen |
US6204594B1 (en) | 1998-06-12 | 2001-03-20 | Cooper Automotive Products, Inc. | Spark plug with pressure sensor |
US6094990A (en) * | 1998-06-30 | 2000-08-01 | Cooper Automotive Products, Inc. | Spark plug with concentric pressure sensor |
FR2792374B1 (fr) * | 1999-04-15 | 2002-05-03 | Renault | Dispositif d'allumage pour moteur a combustion interne et bougie d'allumage pour sa mise en oeuvre |
JP2001135457A (ja) * | 1999-11-05 | 2001-05-18 | Denso Corp | スパークプラグ |
GB2361264A (en) * | 2000-04-10 | 2001-10-17 | Fed Mogul Ignition | Surface discharge spark plug for i.c. engines |
DE10047498A1 (de) * | 2000-09-26 | 2002-04-18 | Bosch Gmbh Robert | Zündkerze kompakter Bauart und Herstellungsverfahren |
US20090241520A1 (en) * | 2008-03-31 | 2009-10-01 | Woodward Governor Company | Diesel Exhaust Soot Sensor System and Method |
WO2009126864A2 (fr) * | 2008-04-10 | 2009-10-15 | Federal-Mogul Ignition Company | Isolant de bougie en céramique et procédé de fabrication |
JP5238803B2 (ja) * | 2008-04-28 | 2013-07-17 | 日本特殊陶業株式会社 | スパークプラグ |
JP5363475B2 (ja) * | 2008-12-25 | 2013-12-11 | 日本特殊陶業株式会社 | スパークプラグ |
JP4948515B2 (ja) * | 2008-12-26 | 2012-06-06 | 日本特殊陶業株式会社 | プラズマジェット点火プラグ |
US20110000193A1 (en) * | 2009-07-02 | 2011-01-06 | Woodward Governor Company | System and method for detecting diesel particulate filter conditions based on thermal response thereof |
US8310249B2 (en) * | 2009-09-17 | 2012-11-13 | Woodward, Inc. | Surface gap soot sensor for exhaust |
US8671901B2 (en) * | 2009-11-30 | 2014-03-18 | GM Global Technology Operations LLC | Excess demand voltage relief spark plug for vehicle ignition system |
WO2011135903A1 (fr) * | 2010-04-26 | 2011-11-03 | 日本碍子株式会社 | Appareil d'allumage pour moteur à combustion interne, et structure d'électrode pour l'appareil d'allumage |
EP2581998B1 (fr) * | 2011-10-14 | 2019-12-18 | Delphi Automotive Systems Luxembourg SA | Bougie d'allumage pour système d'allumage haute fréquence |
JP6419109B2 (ja) * | 2016-06-08 | 2018-11-07 | 日本特殊陶業株式会社 | プラズマジェットプラグ |
JP6709151B2 (ja) * | 2016-12-15 | 2020-06-10 | 株式会社デンソー | 点火制御システム及び点火制御装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0236376A1 (fr) * | 1985-09-17 | 1987-09-16 | Robert Bosch Gmbh | Bougie d'allumage a section a etincelle glissante |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2592754A (en) * | 1945-12-14 | 1952-04-15 | Smitsvonk Nv | Surface discharge spark plug |
US3295005A (en) * | 1963-10-28 | 1966-12-27 | Champion Spark Plug Co | Ceramic sealing structure |
GB1438503A (en) * | 1972-06-08 | 1976-06-09 | Lucas Industries Ltd | Spark discharge plugs |
US4419601A (en) * | 1979-11-05 | 1983-12-06 | Nissan Motor Company, Limited | Spark plug for internal combustion engine |
US4439707A (en) * | 1980-07-23 | 1984-03-27 | Nippon Soken, Inc. | Spark plug with a wide discharge gap |
JPS5765683A (en) * | 1980-10-10 | 1982-04-21 | Nippon Soken | Ignition plug |
US4631451A (en) * | 1983-11-18 | 1986-12-23 | Ford Motor Company | Blast gap ignition system |
US4695758A (en) * | 1984-07-25 | 1987-09-22 | Nippondenso Co., Ltd. | Small-sized spark plug having a spark gap parallel to an axis running through the center electrode |
-
1986
- 1986-05-16 DE DE19863616668 patent/DE3616668A1/de not_active Withdrawn
-
1987
- 1987-05-06 US US07/155,717 patent/US4870319A/en not_active Expired - Fee Related
- 1987-05-06 KR KR1019880700045A patent/KR880701479A/ko not_active Application Discontinuation
- 1987-05-06 JP JP62502705A patent/JPS63503418A/ja active Pending
- 1987-05-06 WO PCT/DE1987/000202 patent/WO1987007094A1/fr active IP Right Grant
- 1987-05-06 BR BR8707310A patent/BR8707310A/pt unknown
- 1987-05-06 EP EP87902423A patent/EP0268598B1/fr not_active Expired
- 1987-05-06 DE DE8787902423T patent/DE3761239D1/de not_active Expired - Lifetime
- 1987-05-14 ES ES8701450A patent/ES2005229A6/es not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0236376A1 (fr) * | 1985-09-17 | 1987-09-16 | Robert Bosch Gmbh | Bougie d'allumage a section a etincelle glissante |
Also Published As
Publication number | Publication date |
---|---|
EP0268598A1 (fr) | 1988-06-01 |
ES2005229A6 (es) | 1989-03-01 |
BR8707310A (pt) | 1988-09-13 |
US4870319A (en) | 1989-09-26 |
WO1987007094A1 (fr) | 1987-11-19 |
KR880701479A (ko) | 1988-07-27 |
DE3761239D1 (de) | 1990-01-25 |
DE3616668A1 (de) | 1987-11-19 |
JPS63503418A (ja) | 1988-12-08 |
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Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050506 |