EP0672312A1 - Bougie d'allumage pour moteurs a combustion interne. - Google Patents

Bougie d'allumage pour moteurs a combustion interne.

Info

Publication number
EP0672312A1
EP0672312A1 EP94900733A EP94900733A EP0672312A1 EP 0672312 A1 EP0672312 A1 EP 0672312A1 EP 94900733 A EP94900733 A EP 94900733A EP 94900733 A EP94900733 A EP 94900733A EP 0672312 A1 EP0672312 A1 EP 0672312A1
Authority
EP
European Patent Office
Prior art keywords
coating
internal combustion
spark plug
silicone
combustion chamber
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
EP94900733A
Other languages
German (de)
English (en)
Other versions
EP0672312B1 (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

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
    • H01T13/20—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 specification DE 31 29 025 C2), in which the longitudinal section (foot) of the insulating body on the combustion-rouge side is provided with a coating which is intended to prevent electrically conductive deposits and from a paraffin solution with at least 0.1%.
  • a paraffin solution with at least 0.1%.
  • silicone oil there is silicone oil;
  • 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 insulator base is intended to avoid electrically conductive deposits which form when the internal combustion engine is operating at temperatures of the insulator base below 500 ° C. These deposits are carbon, water and
  • Silicone oil has already been proposed for such coatings, but this has not proven to be sufficiently effective, because it caused undesired electrical conductivity of the insulating body base due to the penetration of carbon and / or water into the silicone 01 layer.
  • the spark plug according to the invention with the characterizing features of the main claim has the advantage over the fact that the material used as protection against soiling of the insulator base 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.
  • Advantageous further developments and improvements of the spark plug specified in the main claim are possible through the measures listed in the subclaims. It is particularly advantageous if the inside of the metal housing facing the insulating body base is also covered with such a coating, because as a result of this measure the undesired outflow of energy is prevented even more and the application of the coating is also mostly simplified.
  • 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 an essentially tubular metal housing 11, which has on its outside a screw thread 12 and a key hexagon 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 screw thread 12 side has been omitted.
  • the metal housing 11 comprises, in a known manner, a ceramic, rotationally symmetrical insulating body 16, which in most cases essentially consists of sintered aluminum oxide, has on the connection side a so-called head 16/1 which protrudes from the metal housing 11 and which contains a collar (not shown) within the metal housing 11 and then an insulating body foot which is still essentially encompassed by the metal housing 11 Connect 16/2.
  • 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 16/2 and one in the axial bore 15 of the metal housing 11 annular shoulder (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 connection element 19 serves 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 is made of a fire-resistant material, e.g. 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, its outer side 16/2 "from the insulating body foot 16/2 and the inner side 15/1 facing this outer side 16/2 'of the insulating body foot 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. Restricted access to the combustion chamber of the internal combustion engine is, however, also the narrow annular gap (without reference numeral) formed between the central electrode 20 and the longitudinal bore 18 of the insulating body, which is sealed 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 form during 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 resulting from the fuel Deposits would come from the ignition system, even before the actual ignition point of the internal combustion engine in the form of leakage currents, undesirably from the central electrode 20 via these deposits on the outside 16/2 'of the insulating base 16/2 to the mostly electrically grounded metal object drain off at home 11.
  • 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 (for example 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 separate carbon during thermolysis.
  • the coating 22 is preferably introduced via nozzles into the area (16/2 'and 15/1) on the combustion chamber side, accessible to the internal combustion engine combustion chamber, this material also being able to penetrate into the annular gap located between the center electrode 20 and the longitudinal bore 18 of the insulating body; since the material used for the coating 22 is physiologically harmless and environmentally friendly, no expensive extraction systems are required when practicing this method.
  • the application of such coatings 22 to the combustion chamber side section 16/2 of the insulating body 16, i. H. both on its outer side 16/2 'and on the corresponding area of the longitudinal insulating bore 18, can also be carried out at a suitable point on the occasion of the assembly process of such spark plugs 10 by dipping 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 counterelectrode 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.
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
DE4240646A DE4240646A1 (de) 1992-12-03 1992-12-03 Zündkerze für Brennkraftmaschinen
DE4240646 1992-12-03
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 true EP0672312A1 (fr) 1995-09-20
EP0672312B1 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 (15)

* 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
CN103270657B (zh) * 2010-12-06 2017-02-15 弗拉明集团知识产权有限责任公司 防污染火花塞和制备的方法
CN103270658B (zh) * 2010-12-06 2016-03-02 弗拉明集团知识产权有限责任公司 防污染火花塞和制备的方法
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
JP7203080B2 (ja) 2017-07-13 2023-01-12 イーコントロールズ エルエルシー フォークリフト用のモジュール式リチウムイオン電池システム
DE102019203478A1 (de) 2019-03-14 2020-09-17 Robert Bosch Gmbh Zündkerzengehäuse mit Korrosionsschutz auf der Innenseite sowie Zündkerze und Herstellungsverfahren
US12266953B1 (en) 2020-08-17 2025-04-01 Econtrols, Llc Dual chemistry rechargeable battery system for use in electric APU-equipped commercial trucks
WO2022256730A1 (fr) 2021-06-04 2022-12-08 Econtrols, Llc Système de charge de batterie au lithium-ion pour élévateurs à fourche

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
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
JPS5790891A (en) * 1980-11-26 1982-06-05 Ngk Spark Plug Co Ignition plug
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9413046A1 *

Also Published As

Publication number Publication date
BR9307588A (pt) 1999-08-31
CN1087758A (zh) 1994-06-08
DE4240646A1 (de) 1994-06-09
KR950704840A (ko) 1995-11-20
DE59303457D1 (de) 1996-09-19
KR100276034B1 (ko) 2000-12-15
JPH08503804A (ja) 1996-04-23
US5550424A (en) 1996-08-27
WO1994013046A1 (fr) 1994-06-09
EP0672312B1 (fr) 1996-08-14
CN1037046C (zh) 1998-01-14
ES2091116T3 (es) 1996-10-16

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