EP0619631B1 - Arrangement de bougie d'allumage - Google Patents

Arrangement de bougie d'allumage Download PDF

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Publication number
EP0619631B1
EP0619631B1 EP19940105175 EP94105175A EP0619631B1 EP 0619631 B1 EP0619631 B1 EP 0619631B1 EP 19940105175 EP19940105175 EP 19940105175 EP 94105175 A EP94105175 A EP 94105175A EP 0619631 B1 EP0619631 B1 EP 0619631B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
terminal
ignition cable
terminal fixture
cap
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
EP19940105175
Other languages
German (de)
English (en)
Other versions
EP0619631A1 (fr
Inventor
Yoshinao C/O Sumitomo Wiring Syst. Ltd Kobayashi
Mika C/O Sumitomo Wiring Syst. Ltd Okada
Noriya C/O Sumitomo Wiring Syst. Ltd Okamoto
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.)
Sumitomo Wiring Systems Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
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 Sumitomo Wiring Systems Ltd filed Critical Sumitomo Wiring Systems Ltd
Publication of EP0619631A1 publication Critical patent/EP0619631A1/fr
Application granted granted Critical
Publication of EP0619631B1 publication Critical patent/EP0619631B1/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
    • H01T13/02—Details
    • H01T13/06—Covers forming a part of the plug and protecting it against adverse environment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the present invention relates to a spark plug device for a DOHC (double overhead camshaft) type gasoline engine or the like which has an ignition cable connected to a spark plug body and, more particularly, to a spark plug device capable of effectivelv preventing degradation of a plug cap by corona discharge.
  • DOHC double overhead camshaft
  • the spark plug device of Fig. 2 comprises a terminal fixture 53 shown in Fig. 3 which has a crimp-fixing portion 53a crimped and fixed to an end of an ignition cable 51 for electrical connection between the terminal fixture 53 and the ignition cable 51, and a front end portion 53b fitted to a terminal portion of a spark plug body 52 for electrical connection between the spark plug body 52 and the ignition cable 51.
  • the connected portion from the ignition cable 51 to the spark plug body 52 is covered with a relatively long tubular plug cap 54 made of synthetic resin.
  • a rain cover 55 to be fitted to a plug hole of an engine is mounted on the plug cap 54 at its one end on the ignition cable side, and a rubber cap 56 is mounted on the plug cap 54 at its other end on the spark plug body side.
  • the above-mentioned spark plug device has a gap between the outer peripheral surface of the terminal fixture 53 and the inner peripheral surface of the plug cap 54.
  • a potential gradient at a surface of the plug cap 54 of synthetic resin is not less than 3 kV/mm, which is prone to corona discharge in the air adjacent the terminal fixture 53, resulting in the likelihood of not only lowering of insulation of the plug cap 54 with degradation thereof by corona discharge but also pin holes due to dielectric breakdown.
  • US-A-2 458 121 shows a spark plug device for connecting an ignition cable to a spark plug body having a terminal, wherein a plug cap for covering a spark plug body together with the ignition cable is provided and wherein an insulating filler material is provided between the outer peripheral surface of terminal fixture means and the inner peripheral surface of the plug cap.
  • the filler material is for preventing ingress of moisture and air to the contacting portion between the ignition cable and the terminal of the spark plug body.
  • US-A-2 458 121 teaches that an insulating filler material should be used.
  • Such an insulation filler is e.g. a suitable liquid resin, which is filled into the place in question and is subsequently cured and hardened, a suitable rubber, silicon or the like.
  • An object of the present invention is to provide a spark plug device which prevents corona discharge adjacent a terminal fixture and has excellent durability and reliable insulation.
  • a spark plug device comprises: an ignition cable; a spark plug body having a terminal; a terminal fixture connected to an end of said ignition cable and fitted to the terminal of said spark plug body; a tubular plug cap for covering said spark plug body through to said ignition cable; and a filler material for filling a gap formed between the outer peripheral surface of said terminal fixture and the inner peripheral surface of said plug cap for preventing discharges between these surfaces, wherein said filler material being of a conductive material.
  • the present invention is furthermore characterized in that a conductive material is used as filler material for preventing corona discharge between the outer peripheral surface of the terminal fixture and the inner peripheral surface of the plug cap.
  • a terminal fixture 12 is crimped and fixed to an end of an ignition cable 11 for electrical connection between the ignition cable 11 and the terminal fixture 12.
  • a front end of the terminal fixture 12 is fitted to a terminal portion of a spark plug body 13 for electrical connection between the ignition cable 11 and the spark plug body 13.
  • the ignition cable 11 and spark plug body 13 electrically connected to each other through the terminal fixture 12 are covered with a plug cap 14 of elongated, tubular configuration like the prior art made of synthetic resin such as PBT (polybutylene terephthalate) and UP (unsaturated polyester resin).
  • a rubber cap 15 is fitted in and on the plug cap 14 at its one end or lower end.
  • a rain cover 16 made of rubber or the like is fitted over the plug cap 14 at its other end or upper end, and an air bent hole 16a is formed exteriorly of the rain cover 16.
  • a cylindrical cover 17 made of a conductive material having elasticity is fitted in the inner periphery of the plug cap 14 in a portion corresponding to the terminal fixture 12 to fill the gap external to the terminal fixture 12.
  • the separate cover 17 is fitted in the plug cap 14.
  • the inner peripheral surface of the plug cap 14 may be integrally coated with the same conductive material. Otherwise, the gap between the terminal fixture 12 and the plug cap 14 may be filled with a conductive material.

Landscapes

  • Spark Plugs (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (1)

  1. Dispositif de bougie d'allumage comprenant :
    un câble d'allumage (11) ;
    un corps de bougie d'allumage (13) ayant une borne ;
    une fixation de borne (12) connectée à une extrémité du dit câble d'allumage (11) et montée sur la borne du dit corps de bougie d'allumage (13) ;
    un capuchon de bougie tubulaire (14) pour recouvrir le dit corps de bougie d'allumage (13) complètement jusqu'au dit câble d'allumage (11) ; et
    une matière de remplissage (17) pour remplir un intervalle formé entre la surface périphérique extérieure de la dite fixation de borne (12) et la surface périphérique intérieure du dit capuchon de bougie (14) afin d'empêcher des décharges entre ces surfaces,
    caractérisé en ce que
       la dite matière de remplissage (17) est une matière conductrice.
EP19940105175 1993-04-05 1994-03-31 Arrangement de bougie d'allumage Expired - Lifetime EP0619631B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP103636/93 1993-04-05
JP10363693A JPH06295756A (ja) 1993-04-05 1993-04-05 スパークプラグの接続構造

Publications (2)

Publication Number Publication Date
EP0619631A1 EP0619631A1 (fr) 1994-10-12
EP0619631B1 true EP0619631B1 (fr) 1997-10-15

Family

ID=14359261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940105175 Expired - Lifetime EP0619631B1 (fr) 1993-04-05 1994-03-31 Arrangement de bougie d'allumage

Country Status (3)

Country Link
EP (1) EP0619631B1 (fr)
JP (1) JPH06295756A (fr)
DE (1) DE69406171T2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69500300T2 (de) * 1994-12-07 1997-10-02 Sumitomo Wiring Systems Zusammenbauvorrichtung für Zündkerzenstecker
US5716223A (en) * 1996-02-29 1998-02-10 General Motors Corporation Spark plug boot insulator
JP5362486B2 (ja) * 2009-08-27 2013-12-11 ダイニチ工業株式会社 燃焼装置
TWI631276B (zh) * 2017-10-31 2018-08-01 電子設計天地貿易責任有限公司 汽車點火裝置與點火加速器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2458121A (en) * 1945-06-23 1949-01-04 Bendix Aviat Corp Radio shielded ignition means
DE2261103A1 (de) * 1972-12-14 1974-06-20 Kabel Metallwerke Ghh Zuendkerzenstecker fuer verbrennungsmotoren
FR2643194B1 (fr) * 1989-02-14 1993-12-17 Musorb Application Ferrites Dispositif de connexion electrique d'un cable, notamment d'allumage, sur un plot

Also Published As

Publication number Publication date
DE69406171D1 (de) 1997-11-20
JPH06295756A (ja) 1994-10-21
EP0619631A1 (fr) 1994-10-12
DE69406171T2 (de) 1998-03-05

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