EP0430899A1 - Zündkerze, insbesondere für aufgeladene und Rennmotoren - Google Patents

Zündkerze, insbesondere für aufgeladene und Rennmotoren Download PDF

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Publication number
EP0430899A1
EP0430899A1 EP90830497A EP90830497A EP0430899A1 EP 0430899 A1 EP0430899 A1 EP 0430899A1 EP 90830497 A EP90830497 A EP 90830497A EP 90830497 A EP90830497 A EP 90830497A EP 0430899 A1 EP0430899 A1 EP 0430899A1
Authority
EP
European Patent Office
Prior art keywords
central electrode
spark plug
lateral surface
insulating element
insulator
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Withdrawn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
EP90830497A
Other languages
English (en)
French (fr)
Inventor
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.)
Industrie Magneti Marelli SRL
Marelli Europe SpA
Original Assignee
Industrie Magneti Marelli SRL
Magneti Marelli SpA
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 Industrie Magneti Marelli SRL, Magneti Marelli SpA filed Critical Industrie Magneti Marelli SRL
Publication of EP0430899A1 publication Critical patent/EP0430899A1/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Withdrawn legal-status Critical Current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
    • H01T13/46—Sparking plugs having two or more spark gaps
    • H01T13/467—Sparking plugs having two or more spark gaps in parallel connection

Definitions

  • the present invention relates to a spark plug, particularly a plug for supercharged (turbocharged) and racing engines.
  • the subject of the invention is a spark plug comprising: an outer tubular metal body, an insulating element disposed in the body and having an end which projects axially beyond the end of the body facing the combustion chamber in use, a central electrode which extends through the insulating element and has a substantially disc-shaped end head projecting axially beyond the end of the insulating element, and a plurality of earth electrodes connected to the end of the body and extending towards the end of the central electrode which projects from the insulator.
  • the spark plug according to the invention is characterised in that the extent of the head portion of the central electrode is such that its lateral surface is substantially flush with the lateral surface of the end portion of the insulator.
  • the head portion of the central electrode constitutes a protective shield for the end portion of the insulator, reducing the erosion of the insulator by the spark and at the same time protecting the insulator from the combustion flame.
  • a spark plug according to the invention for an internal combustion engine is generally indicated 1.
  • the plug includes, in known manner, a tubular metal body 2 one end of which is threaded externally.
  • An element 3 of electrically-insulating material typically a ceramic material, is disposed in the body 2 in known manner.
  • An end portion 3a of this element projects axially beyond the end of the metal body 2 which faces the combustion chamber in use.
  • a central electrode 4 extends through the insulating element 3 and in turn projects axially beyond the end 3a of the insulating element 3.
  • the central electrode 4 is connected, in known manner, not shown, to a high-tension terminal, indicated 5 in Figure 1, projecting from the other end of the insulating element 3.
  • annular metal element 6 An end edge 2a of the metal body 2 is upset onto an annular metal element, indicated 6 ( Figure 2).
  • the annular element 6 may be made, for example, of a nickel-, platinum- or copper-based alloy.
  • the annular element 6 has a plurality of integral appendages 7 which extend from its inner edge towards the end portion 3a of the insulator in equiangularly-­spaced positions. These appendages constitute the earth electrodes of the plug.
  • the central electrode 4 has a substantially disc-shaped end head 4a whose radial extent is such that its lateral surface is substantially flush with the lateral surface of the end portion 3a of the insulating element 3.
  • the portion 3a of the insulating element is protected from the flame which develops during combustion and, moreover, is less susceptible to erosion by the spark.
  • the plug thus formed is suitable for use even in supercharged and racing engines.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP90830497A 1989-11-07 1990-10-30 Zündkerze, insbesondere für aufgeladene und Rennmotoren Withdrawn EP0430899A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5347189U 1989-11-07
IT53471U IT219104Z2 (it) 1989-11-07 1989-11-07 Candela di accensione, particolarmente per motori sovralimentati e da competizione

Publications (1)

Publication Number Publication Date
EP0430899A1 true EP0430899A1 (de) 1991-06-05

Family

ID=11283043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90830497A Withdrawn EP0430899A1 (de) 1989-11-07 1990-10-30 Zündkerze, insbesondere für aufgeladene und Rennmotoren

Country Status (3)

Country Link
EP (1) EP0430899A1 (de)
BR (1) BR7002432U (de)
IT (1) IT219104Z2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015115019B4 (de) 2014-09-08 2023-11-02 Denso Corporation Zündkerze für eine Brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3538372A (en) * 1968-01-08 1970-11-03 Kunio Terao Wide gap discharge spark plug
US4439707A (en) * 1980-07-23 1984-03-27 Nippon Soken, Inc. Spark plug with a wide discharge gap
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3538372A (en) * 1968-01-08 1970-11-03 Kunio Terao Wide gap discharge spark plug
US4439707A (en) * 1980-07-23 1984-03-27 Nippon Soken, Inc. Spark plug with a wide discharge gap
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015115019B4 (de) 2014-09-08 2023-11-02 Denso Corporation Zündkerze für eine Brennkraftmaschine

Also Published As

Publication number Publication date
IT8953471U1 (it) 1991-05-07
IT219104Z2 (it) 1992-12-01
IT8953471V0 (it) 1989-11-07
BR7002432U (pt) 1992-07-07

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Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT SE

17P Request for examination filed

Effective date: 19910725

17Q First examination report despatched

Effective date: 19930726

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19931207