EP0672312B1 - Bougie d'allumage pour moteurs a combustion interne - Google Patents

Bougie d'allumage pour moteurs a combustion interne Download PDF

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Publication number
EP0672312B1
EP0672312B1 EP94900733A EP94900733A EP0672312B1 EP 0672312 B1 EP0672312 B1 EP 0672312B1 EP 94900733 A EP94900733 A EP 94900733A EP 94900733 A EP94900733 A EP 94900733A EP 0672312 B1 EP0672312 B1 EP 0672312B1
Authority
EP
European Patent Office
Prior art keywords
coating
internal combustion
spark plug
silicone rubber
insulating
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
EP94900733A
Other languages
German (de)
English (en)
Other versions
EP0672312A1 (fr
Inventor
Irene Jennrich
Lothar Weber
Andreas Niegel
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.)
Robert Bosch GmbH
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 EP0672312A1 publication Critical patent/EP0672312A1/fr
Application granted granted Critical
Publication of EP0672312B1 publication Critical patent/EP0672312B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/38—Selection of materials for insulation
    • 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
    • H01T13/14—Means for self-cleaning

Definitions

  • the invention relates to a spark plug for internal combustion engines according to the preamble of the main claim.
  • a spark plug is already known (patent DE 31 29 025 C2), in which the combustion chamber-side longitudinal section (foot) of the insulating body is provided with a coating which is intended to prevent electrically conductive deposits and from a paraffin solution with at least 0.1% silicone oil consists;
  • the inside of the spark plug metal housing facing the insulator body can also be coated with such a coating.
  • the paraffin and the silicone must be dissolved in a solvent such as trichlorethylene, chlorobenzene, toluene or the like, the use of which is undesirable from a physiological point of view and for reasons of environmental protection.
  • This coating on the base of the insulator is intended to avoid electrically conductive deposits which form during operation of internal combustion engines at temperatures of the base of the insulator below 500 ° C. These deposits are carbon, water and other electrically conductive substances resulting from the fuel. As a result of these deposits, energy originating from the ignition system can undesirably flow away in the form of leakage currents even before the actual ignition time of the internal combustion engine and can lead to cold start problems and misfires in the internal combustion engine; these deposits with their consequences described above have a particularly disruptive effect when installing spark plugs in new vehicles which, during their running-in phase of a few 100 km, often only move at low speeds and / or low loads and consequently do not have the temperature of the insulator base of the spark plugs bring over the so-called free-burning temperature of 500 ° C.
  • Silicone oil has also already been proposed for such coatings, but this has not proven to be sufficiently effective, since it caused undesired electrical conductivity of the insulating body base due to the penetration of carbon and / or water into the silicone oil layer.
  • the spark plug according to the invention with the characterizing features of the main claim has the advantage that the material used as protection against soiling of the insulating body foot is not only sufficiently effective, but is also solvent-free, that is to say physiologically harmless and environmentally friendly; Therefore, no expensive suction devices are required to apply such coatings.
  • Another advantage is that the coating according to the invention is easy to grip and does not lose its protection against contamination even when such spark plugs are stored for a long time.
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description; the figure shows a spark plug in longitudinal view with a section through its end section on the combustion chamber side in an enlarged view.
  • the (high-voltage) spark plug 10 shown in the figure of the drawing has a substantially tubular metal housing 11, which has on its outside a screw thread 12 and a hexagon socket 13 as a means for installing the spark plug 10 in an internal combustion engine, not shown, in particular in an Internal combustion engine of motor vehicles.
  • This metal housing 11 has, in the region of its end on the combustion chamber side, a counterelectrode 14 which is hook-shaped.
  • the illustration of a sealing ring or a sealing surface arranged on the connection side of the screw-in thread 12 has been dispensed with.
  • the metal housing 11 comprises, in a known manner, a ceramic, rotationally symmetrical insulating body 16, which for the most part essentially consists of sintered aluminum oxide, on the connection side has a protruding from the metal housing 11, the so-called head 16/1, which is followed by a collar (not shown) within the metal housing 11 and then an insulating body foot 16/2, which is essentially still enclosed by the metal housing 11 .
  • This insulating body 16 is held firmly and sealingly in the area mentioned by the metal housing 11, inter alia by means of a sealing ring 17 which is located between the connection-side frustoconical end of the insulating body foot 16/2 and an annular shoulder located in the axial bore 15 of the metal housing 11 (without Reference numerals) is arranged.
  • the insulating body 16 has, in a known manner, a longitudinal bore 18, from which a connection element 19, which in the present example is designed as a threaded section, protrudes; this connecting element 19 is used to connect the spark plug 10 to a known ignition system, not shown.
  • a substantially cylindrical central electrode 20 is also fixed in a sealed manner, which is in electrical connection with the connecting element 19 and made of a burn-resistant material, for. B. consists of a nickel alloy.
  • the air spark gap formed between the end section of this center electrode 20 on the combustion chamber side and the counter electrode 14 is designated by 21.
  • the area of the spark plug 10 which is directly accessible to the internal combustion engine combustion chamber comprises, in particular, the outside 16/2 'of the insulator base 16/2 and the inside 15/1 facing this outside 16/2' of the insulator base 16/2 the metal housing axial bore 15; this area is delimited on the connection side by the sealing ring 17 between the insulating body 16 and the metal housing 11.
  • the narrow annular gap (without reference number) formed between the central electrode 20 and the longitudinal bore 18 of the insulating body, which is closed on the connection side by a sealing compound, not shown, preferably by an electrically conductive glass.
  • At least the outer side 16/2 'of the insulating body foot 16/2, which extends as far as the sealing ring 17, but preferably also the described inner side 15/1 of the metal housing 11 are coated with a coating 22 which avoids electrically conductive deposits which can be found in the Operation of internal combustion engines at temperatures of the insulator base 16/2 below 500 ° C; These deposits can be carbon, water and other electrically conductive substances that result from the fuel. As a result of such deposits, energy originating from the ignition system would undesirably in the form of leakage currents from the central electrode 20 via these deposits on the outside 16/2 'of the insulator base 16/2 to the metal housing 11, which is usually electrically connected to ground, even before the actual ignition time of the internal combustion engine flow away.
  • the coating 22 according to the invention consists of solvent-free silicone rubber or solvent-free silicone resin.
  • the solvent-free silicone rubber can also be provided with a proportion of filler (e.g. highly disperse silica).
  • the coating 22 consisting of silicone rubber can be mixed with silicone oil, the proportion of the silicone oil being up to 99.9%, but preferably between 75 and 85%.
  • the silicone can be types that crosslink through moisture or harden due to the influence of light or heat.
  • the silicone can also be used as a varnish, but this varnish should not be mixed with substances that deposit carbon during thermolysis.
  • the coating 22 is preferably introduced via nozzles into the area (16/2 'and 15/1) on the combustion chamber side which is accessible to the internal combustion engine combustion chamber, this material also being able to penetrate into the annular gap between the center electrode 20 and the longitudinal bore 18 of the insulating body; since the material used for the cover 22 is physiologically safe and environmentally friendly, no expensive extraction systems are required when carrying out this method.
  • the application of such coatings 22 on the combustion chamber-side section 16/2 of the insulating body 16, i. H. both on its outside 16/2 'and on the corresponding area of the insulating body longitudinal bore 18, can also be carried out at a suitable point on the occasion of the assembly process of such spark plugs 10 by immersion processes, brushing processes, printing processes and of course also by spraying.
  • the coating 22 according to the invention can also be used in spark plugs in which the counter electrode 14 is arranged in another known manner and the spark gap 21 is not a pure air spark gap but also a combined air-sliding spark gap or even a pure sliding spark gap.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

La présente invention concerne une bougie (10) servant à l'allumage de mélanges air-carburant dans des moteurs à combustion interne, en particulier dans les moteurs de véhicules automobiles. Cette bougie d'allumage présente à la base de son corps isolant (16/2) un revêtement (22) qui - notamment en cas de montage des bougies dans des véhicules neufs - doit protéger le moteur contre des ratés d'allumage et des difficultés de démarrage à froid suite à des dépôts électroconducteurs. Ce revêtement (22) est composé d'un caoutchouc au silicone ou d'une résine de silicone exempts de solvant. Le caoutchouc au silicone peut contenir une matière de charge et de l'huile de silicone en facilite le travail. Conformément au but recherché, la face interne (15/1) de l'enveloppe métallique (11) qui est exposée dans la chambre de combustion est elle aussi couverte de ce revêtement (22). Ce revêtement (22) est physiologiquement admissible, écologique, résiste au toucher et ne nécessite aucune installation d'aspiration coûteuse lors de son application par pulvérisation réalisée au moyen de buses sur la zone correspondante de la bougie d'allumage.

Claims (5)

  1. Bougie d'allumage (10) pour moteurs à combustion interne, notamment des moteurs à combustion interne de véhicules automobiles, comprenant un culot métallique tubulaire (11) ayant sur son côté extérieur des moyens (12, 13) pour fixer la bougie (10) dans un moteur à combustion interne et dont le perçage axial (15) entoure de manière étanche au moins un segment de longueur d'un isolateur tubulaire (16) en matière céramique, dont le perçage longitudinal (18) entoure de manière étanche, du côté de la chambre de combustion, une électrode centrale (20), celle-ci étant reliée électriquement, du côté du branchement, à un élément de connexion (19) fixé dans ce perçage longitudinal (18) de l'isolateur, et dont la zone située du côté de la chambre de combustion se trouve en regard d'une contre-électrode (14) pour former un chemin à étincelles (21), le pied (16/2) de l'isolateur exposé à la chambre de combustion du moteur à combustion interne étant muni d'un revêtement (22) contenant du silicone, pour être protégé contre l'encrassage, caractérisée en ce que le revêtement (22) est un caoutchouc au silicone sans solvant ou une résine au silicone sans solvant.
  2. Bougie d'allumage (10) selon la revendication 1, caractérisée en ce que le revêtement (22) en caoutchouc au silicone contient une partie de matière de charge.
  3. Bougie d'allumage (10) selon l'une des revendications 1 ou 2, caractérisée en ce que le revêtement (22) contenant le caoutchouc au silicone contient de l'huile au silicone pour en faciliter l'utilisation.
  4. Bougie d'allumage (10) selon la revendication 3, caractérisée en ce que le revêtement (22) contient jusqu'à 99,9 % d'huile au silicone et de préférence toutefois entre 75 et 85 % d'huile au silicone.
  5. Bougie d'allumage (10) selon l'une des revendications 1 à 4, caractérisée en ce que le revêtement (22) recouvre également la face intérieure (15/1) du culot métallique (11) tournée vers le pied (16/2) de l'isolateur.
EP94900733A 1992-12-03 1993-11-27 Bougie d'allumage pour moteurs a combustion interne Expired - Lifetime EP0672312B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4240646 1992-12-03
DE4240646A DE4240646A1 (de) 1992-12-03 1992-12-03 Zündkerze für Brennkraftmaschinen
PCT/DE1993/001133 WO1994013046A1 (fr) 1992-12-03 1993-11-27 Bougie d'allumage pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP0672312A1 EP0672312A1 (fr) 1995-09-20
EP0672312B1 true EP0672312B1 (fr) 1996-08-14

Family

ID=6474281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94900733A Expired - Lifetime EP0672312B1 (fr) 1992-12-03 1993-11-27 Bougie d'allumage pour moteurs a combustion interne

Country Status (9)

Country Link
US (1) US5550424A (fr)
EP (1) EP0672312B1 (fr)
JP (1) JPH08503804A (fr)
KR (1) KR100276034B1 (fr)
CN (1) CN1037046C (fr)
BR (1) BR9307588A (fr)
DE (2) DE4240646A1 (fr)
ES (1) ES2091116T3 (fr)
WO (1) WO1994013046A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6111345A (en) * 1996-08-29 2000-08-29 Denso Corporation Spark plug for apparatus for detecting ion current without generating spike-like noise on the ion current
JPH11214120A (ja) * 1998-01-29 1999-08-06 Ngk Spark Plug Co Ltd 内燃機関用スパークプラグとその製造方法
DE19940455C2 (de) * 1999-08-25 2003-06-18 Bosch Gmbh Robert Zündeinrichtung,insbesondere Zündkerze für Ottomotoren, und Verfahren zur Lackierung derselben
DE19943995A1 (de) * 1999-09-14 2001-03-15 Volkswagen Ag Zündkerze
DE102006033480A1 (de) * 2006-07-19 2008-01-24 Robert Bosch Gmbh Zündkerze, insbesondere für hohe Brennraumdrücke
JP2013545258A (ja) 2010-12-06 2013-12-19 フラム・グループ・アイピー・エルエルシー ファウリング防止（ａｎｔｉ−ｆｏｕｌｉｎｇ）点火プラグおよび製作方法
DE112011104037T5 (de) * 2010-12-06 2013-10-24 Fram Group Ip Llc Zündkerze mit Verrußungsschutz und Verfahren zu deren Herstellung
WO2012161886A1 (fr) * 2011-05-26 2012-11-29 Fram Group IP, LLC Bougie d'allumage antisalissure et son procédé de fabrication
US9337627B2 (en) 2011-05-26 2016-05-10 Fram Group Ip Llc Method of applying a coating to a spark plug insulator
US8729784B2 (en) 2012-02-17 2014-05-20 Fram Group Ip Llc Fouling resistant spark plug
DE102014210922A1 (de) * 2014-06-06 2015-12-17 Ford Global Technologies, Llc Verfahren zur Herstellung einer Zündkerze für einen Verbrennungsmotor sowie Zündkerze für einen Verbrennungsmotor
DE102019203478A1 (de) * 2019-03-14 2020-09-17 Robert Bosch Gmbh Zündkerzengehäuse mit Korrosionsschutz auf der Innenseite sowie Zündkerze und Herstellungsverfahren

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1005107A (fr) * 1900-01-01
US3345532A (en) * 1965-04-06 1967-10-03 Gen Motors Corp Spark plug with the insulator tip coated with a lead oxyhalide
JPS5910551B2 (ja) * 1977-10-14 1984-03-09 株式会社豊田中央研究所 点火栓及びその製造方法
JPS5949677B2 (ja) * 1978-06-05 1984-12-04 株式会社豊田中央研究所 点火栓及びその製造方法
JPS5790891A (en) * 1980-11-26 1982-06-05 Ngk Spark Plug Co Ignition plug
DE3152877C2 (de) * 1980-07-22 1985-08-14 Ngk Spark Plug Co., Ltd., Nagoya, Aichi Zündkerze
US4415828A (en) * 1980-07-22 1983-11-15 Ngk Spark Plug Co., Ltd. Sparkplug with antifouling coating on discharge end of insulator
DE3533124A1 (de) * 1985-09-17 1987-03-26 Bosch Gmbh Robert Zuendkerze mit gleitfunkenstrecke
JPH0821461B2 (ja) * 1988-03-08 1996-03-04 日本特殊陶業株式会社 耐汚損性のすぐれた点火プラグ
CA2013129C (fr) * 1989-03-28 1998-02-17 Eigo Goto Bougie d'allumage pour moteur a combustion interne
US5274298A (en) * 1991-12-23 1993-12-28 Ford Motor Company Spark plug having an ablative coating for anticontaminat fouling

Also Published As

Publication number Publication date
CN1037046C (zh) 1998-01-14
KR950704840A (ko) 1995-11-20
BR9307588A (pt) 1999-08-31
WO1994013046A1 (fr) 1994-06-09
US5550424A (en) 1996-08-27
JPH08503804A (ja) 1996-04-23
KR100276034B1 (ko) 2000-12-15
DE4240646A1 (de) 1994-06-09
CN1087758A (zh) 1994-06-08
DE59303457D1 (de) 1996-09-19
EP0672312A1 (fr) 1995-09-20
ES2091116T3 (es) 1996-10-16

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