EP0619631A1 - Arrangement de bougie d'allumage - Google Patents

Arrangement de bougie d'allumage Download PDF

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Publication number
EP0619631A1
EP0619631A1 EP94105175A EP94105175A EP0619631A1 EP 0619631 A1 EP0619631 A1 EP 0619631A1 EP 94105175 A EP94105175 A EP 94105175A EP 94105175 A EP94105175 A EP 94105175A EP 0619631 A1 EP0619631 A1 EP 0619631A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
cap
terminal fixture
filler material
rubber
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
EP94105175A
Other languages
German (de)
English (en)
Other versions
EP0619631B1 (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 a ignition cable connected to a spark plug body and, more particularly, to a spark plug device capable of effectively preventing degradation of a plug cap by corona discharge.
  • DOHC double overhead camshaft
  • FIG. 3 An example of spark plug devices for DOHC type gasoline engines is shown in Fig. 3.
  • the spark plug device of Fig. 3 comprises a terminal fixture 53 shown in Fig. 4 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.
  • a spark plug device comprises: an ignition cable, a spark plug body having a terminal, a terminal fixture connected to an end of the ignition cable and fitted to the terminal of the spark plug body, a tubular plug cap for covering the spark plug body through to the ignition cable, and a filler material for filling a gap formed between the outer peripheral surface of the terminal fixture and the inner peripheral surface of the plug cap.
  • the filler material is used for filling the gap between the outer peripheral surface of the terminal fixture and the inner peripheral surface of the plug cap, there is no layer of air between the terminal fixture and the plug cap to avoid corona discharge. This effectively prevents lowering of insulation of the plug cap with degradation thereof by the corona discharge and the pin holes due to dielectric breakdown.
  • the filler material is rubber or an organic material containing neither aluminum nor calcium as an element.
  • the filler material made of rubber or the organic material other than rubber which contains neither aluminum nor calcium as an element prevents the production of the deliquescent conductive deposits such as aluminum salt or calcium salt if corona discharge is generated.
  • the continuous conduction passageway is prevented which extends from the inner surface to outer surface of the plug cap, and no energy leaks outwardly. Thus, the non-discharge of the spark plug is avoided.
  • the filler material includes an insulator for integrally covering the inner peripheral surface of the plug cap.
  • the spark plug device further comprises a rubber cap fitted to the plug cap at its one end on the spark plug body side, the filler material being formed of the same material as and integrally with the rubber cap.
  • the insulation thickness of the plug cap substantially increases by the presence of the insulative material, whereby the pin holes due to the dielectric breakdown are not liable to be produced.
  • the insulative material is rubber, abrasion of the head of the spark plug body and inner surface of the plug cap due to vibration is alleviated.
  • the filler material may be either insulative or conductive only for the purpose of preventing corona discharge.
  • 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 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 insulating cover 17 made of a fluid material having elasticity if hardened such as silicone rubber 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 insulating cover 17 made of silicone rubber, if containing a metallic element such as aluminum or calcium, produces no conductive deposits such as aluminum salt or calcium salt, thereby preventing outward energy leaks and non-discharge of the spark plug body 13.
  • ozone gas (O3) generated by the corona discharge chemically reacts with nitrogen gas (N2) in the air to produce nitrate ions (NO3 ⁇ ), which in turn react with aluminum or calcium in the insulating cover 17 to produce deliquescent Al(NO3)3 or Ca(NO3)2.
  • N2 nitrogen gas
  • NO3 ⁇ nitrate ions
  • a continuous conduction passageway is thus formed which extends from the inner surface to outer surface of the insulating cover 17, resulting in electrical energy leaks.
  • the material of the insulating cover 17, if an organic material other than rubber, preferably contains neither aluminum nor calcium.
  • the separate insulating 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 insulator. Otherwise, the gap between the terminal fixture 12 and the plug cap 14 may be filled with an insulative material.
  • the insulating cover 17 and the rubber cap 15 are separate members in this preferred embodiment, the insulating cover 17 and the rubber cap 15 may be integrally formed of the same material, provided that the material is suited for the insulating cover 17.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
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 true EP0619631A1 (fr) 1994-10-12
EP0619631B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0716482A1 (fr) * 1994-12-07 1996-06-12 Sumitomo Wiring Systems, Ltd. Appareil d'assemblage de connecteur de bougie
EP0793319A1 (fr) * 1996-02-29 1997-09-03 General Motors Corporation Capuchon isolateur pour bougie d'allumage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (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
US3914003A (en) * 1972-12-14 1975-10-21 Kabel Metallwerke Ghh Spark plug socket for internal combustion engines
EP0383661A1 (fr) * 1989-02-14 1990-08-22 Societe D'application Des Ferrites-Musorb Dispositif de connexion électrique d'un câble, notamment d'allumage, sur un plot

Patent Citations (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
US3914003A (en) * 1972-12-14 1975-10-21 Kabel Metallwerke Ghh Spark plug socket for internal combustion engines
EP0383661A1 (fr) * 1989-02-14 1990-08-22 Societe D'application Des Ferrites-Musorb Dispositif de connexion électrique d'un câble, notamment d'allumage, sur un plot

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0716482A1 (fr) * 1994-12-07 1996-06-12 Sumitomo Wiring Systems, Ltd. Appareil d'assemblage de connecteur de bougie
US5706569A (en) * 1994-12-07 1998-01-13 Sumitomo Wiring Systems, Ltd. Apparatus for assembling plug joint
EP0793319A1 (fr) * 1996-02-29 1997-09-03 General Motors Corporation Capuchon isolateur pour bougie d'allumage
US5716223A (en) * 1996-02-29 1998-02-10 General Motors Corporation Spark plug boot insulator

Also Published As

Publication number Publication date
JPH06295756A (ja) 1994-10-21
DE69406171T2 (de) 1998-03-05
EP0619631B1 (fr) 1997-10-15
DE69406171D1 (de) 1997-11-20

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