EP0633637A1 - Zündkerze - Google Patents

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Publication number
EP0633637A1
EP0633637A1 EP94110340A EP94110340A EP0633637A1 EP 0633637 A1 EP0633637 A1 EP 0633637A1 EP 94110340 A EP94110340 A EP 94110340A EP 94110340 A EP94110340 A EP 94110340A EP 0633637 A1 EP0633637 A1 EP 0633637A1
Authority
EP
European Patent Office
Prior art keywords
layer
insulating element
metal body
plug according
central electrode
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.)
Withdrawn
Application number
EP94110340A
Other languages
English (en)
French (fr)
Inventor
Gianmichele Latte
Roberto Rossi
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.)
Cooper Industries LLC
Original Assignee
Cooper Industries LLC
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 Cooper Industries LLC filed Critical Cooper Industries LLC
Publication of EP0633637A1 publication Critical patent/EP0633637A1/de
Withdrawn legal-status Critical Current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 present invention relates to spark plugs for internal combusion engines with controlled ignition.
  • the invention relates to a spark plug of the type comprising: an outer tubular metal body, a tubular insulating element disposed in the body, a central electrode which extends through the insulating element and projects axially beyond the end of the insulating element which faces the combustion chamber in use, and at least one earth electrode which extends from the outer metal body towards the side surface of the portion of the central electrode which projects from the insulator.
  • An object of the invention is to provide a spark plug of the type specified above which prevents the deposition of carbon particles on the end of the ceramic insulating element.
  • the object of the present invention is to provide a spark plug for internal combustion engines with controlled ignition which is highly resistant to fouling during the pre-sale life of the motor-vehicle in which it is mounted.
  • the plug 1 comprises, in known manner, an outer tubular metal body 2, a portion 2' of which is threaded externally.
  • An end portion 3a of the insulating element 3 projects axially beyond the end of the metal body 2 which faces the combustion chamber in use.
  • a central electrode, indicated 4 extends through a portion of the insulating element 3 and projects beyond the end 3a of the insulating element.
  • a conductor core 5 is also disposed in the insulating element 3. One end of the core projects axially from the insulating element 3 and forms an electrical connection terminal 6.
  • the plug 1 also comprises one (or more) substantially arcuate earth electrodes 9 which are connected (for example, by welding) to the annular end surface of the metal body 2 and the ends of which face the central electrode 4.
  • moisture and carbon particles are deposited on the surfaces 11 of the insulating element 3 which are directly exposed to the atmosphere of the combustion chamber near the central electrode 4 or which face the outer tubular metal body 2, and the moisture and carbon particles stick to the rough ceramic surface, forming a continuous electrically-conductive layer which, as already stated, may short-circuit the central electrode 4 to the metal body 2 at high voltages, preventing discharge to the earth electrode 9 and consequently rendering the plug unserviceable.
  • a covering layer 13 of waterproof and anti-adhesive material for example of fluorocarbon polymer or a Polytetrafluoroethylene dispersion (Teflon Oil) on the walls 11 drastically reduces fouling, by preventing the binding of the carbon particles by virtue of the waterproofing and anti-adhesive properties of the aforementioned substances.
  • the layer 13 of waterproof and anti-adhesive material may be deposited by the usual spraying, mechanical application, or immersion techniques, possibly followed by a hot cross-linking treatment.
  • the layer 13 of waterproof and anti-adhesive material is conveniently a few ⁇ m (microns) thick.
  • the thickness of the coating material, its chemical composition, and/or the application techniques may be varied.

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  • Spark Plugs (AREA)
EP94110340A 1993-07-06 1994-07-04 Zündkerze Withdrawn EP0633637A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930494 1993-07-06
ITTO930494A IT1261082B (it) 1993-07-06 1993-07-06 Candela di accensione

Publications (1)

Publication Number Publication Date
EP0633637A1 true EP0633637A1 (de) 1995-01-11

Family

ID=11411607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110340A Withdrawn EP0633637A1 (de) 1993-07-06 1994-07-04 Zündkerze

Country Status (2)

Country Link
EP (1) EP0633637A1 (de)
IT (1) IT1261082B (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3152877C2 (de) * 1980-07-22 1985-08-14 Ngk Spark Plug Co., Ltd., Nagoya, Aichi Zündkerze
JPH01231281A (ja) * 1988-03-08 1989-09-14 Ngk Spark Plug Co Ltd 耐汚損性のすぐれた点火プラグ
US4937484A (en) * 1988-05-16 1990-06-26 Nippondenso Co., Ltd. Sparking plug
EP0390065A1 (de) * 1989-03-28 1990-10-03 NGK Spark Plug Co. Ltd. Zündkerze für einen Verbrennungsmotor
EP0497189A2 (de) * 1991-01-23 1992-08-05 Matsushita Electric Industrial Co., Ltd. Wasser- und ölabweisender adsorbierter Film und Verfahren zu dessen Herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3152877C2 (de) * 1980-07-22 1985-08-14 Ngk Spark Plug Co., Ltd., Nagoya, Aichi Zündkerze
JPH01231281A (ja) * 1988-03-08 1989-09-14 Ngk Spark Plug Co Ltd 耐汚損性のすぐれた点火プラグ
US4937484A (en) * 1988-05-16 1990-06-26 Nippondenso Co., Ltd. Sparking plug
EP0390065A1 (de) * 1989-03-28 1990-10-03 NGK Spark Plug Co. Ltd. Zündkerze für einen Verbrennungsmotor
EP0497189A2 (de) * 1991-01-23 1992-08-05 Matsushita Electric Industrial Co., Ltd. Wasser- und ölabweisender adsorbierter Film und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 558 (E - 858)<3906> 12 December 1989 (1989-12-12) *

Also Published As

Publication number Publication date
ITTO930494A1 (it) 1995-01-06
ITTO930494A0 (it) 1993-07-06
IT1261082B (it) 1996-05-08

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19950712