EP0478411A1 - Improved spark plug for internal combustion engine - Google Patents

Improved spark plug for internal combustion engine Download PDF

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Publication number
EP0478411A1
EP0478411A1 EP91402410A EP91402410A EP0478411A1 EP 0478411 A1 EP0478411 A1 EP 0478411A1 EP 91402410 A EP91402410 A EP 91402410A EP 91402410 A EP91402410 A EP 91402410A EP 0478411 A1 EP0478411 A1 EP 0478411A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
central electrode
spark
electrode
connection
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
EP91402410A
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German (de)
French (fr)
Other versions
EP0478411B1 (en
Inventor
Michel Matesco
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.)
Sagem SA
Original Assignee
EYQUEM DITE Ste
Eyquem Dite Ste
EYQUEM SOC
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Application filed by EYQUEM DITE Ste, Eyquem Dite Ste, EYQUEM SOC filed Critical EYQUEM DITE Ste
Publication of EP0478411A1 publication Critical patent/EP0478411A1/en
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Anticipated expiration legal-status Critical
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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
    • H01T13/04—Means providing electrical connection to sparking plugs

Definitions

  • the present invention relates to spark plugs for an internal combustion engine and relates more particularly to the means for connecting these spark plugs to the engine ignition circuit.
  • a spark plug generally has a central electrode and a ground electrode insulated from each other by a body made of insulating material such as ceramic, the two electrodes having two ends facing each other. which define a spark generation interval.
  • the spark plug At its opposite end intended to be connected to the ignition circuit, the spark plug has a connection terminal connected to the central electrode.
  • This terminal is generally made up of a standardized part produced up to now using two known techniques.
  • connection terminal is formed of a rod whose free end is threaded in accordance with ISO standard 1919-1982.
  • a connection piece consisting of a threaded nut or socket, in accordance with ISO standard 1919-1982.
  • the end rod of the electrode and the connection part are produced in one piece, by cold striking or by turning.
  • connection terminal produced according to the first technique has the drawback of being unscrewed frequently under the effect of the vibration stresses of the internal combustion engine.
  • connection terminal produced according to the second technique or "one-piece” connection terminal has the disadvantage, mainly in the technique of mounting so-called “hot” or “conductive cement” candles, of being coated with a layer of nickel oxidized, for example, which makes it particularly difficult to assemble and disassemble the spark plug electrical supply conductors.
  • the invention aims to remedy the drawbacks of the prior art by creating a connection terminal for a spark plug which, while being of reduced manufacturing cost, allows easy assembly and disassembly of the supply conductor and presents risks. reduced oxidation.
  • a spark plug for an internal combustion engine comprising a central electrode and at least one ground electrode defining between them a spark formation interval, the end of the central electrode opposite to the interval forming sparks in the form of a rod carrying a connection piece to an ignition circuit, characterized in that the connection piece made of metal which is a good conductor of electricity is force-fitted onto the rod end of the central electrode.
  • the external surface of the end rod of the central electrode has reliefs and the connection piece comprises a smooth bore force fitted onto the external surface provided with said reliefs.
  • a spark plug 1 having a metal base 2 provided with an external thread 3 for mounting the spark plug and a curved mass electrode 4 cooperating with a central electrode 5 to define a spark formation interval 6.
  • the ground electrode 4 isolated from the central electrode 5 by a sleeve 7 of insulating material such as ceramic.
  • the central electrode 5 At its end opposite to the spark formation interval 6, the central electrode 5 comprises a rod 8 which projects beyond the insulator 7 and which is intended to allow the connection of the spark plug to a circuit d 'ignition.
  • the rod 8 carries a connection piece 9 of standardized external profile, intended to cooperate with a split socket of complementary profile or with a clamp of a female connector fixed to the end of a conductor connecting the spark plug with the circuit. ignition (not shown).
  • the outer surface of the rod 8 has knurling 10 or other reliefs.
  • connection piece 9 has, as can be seen better in Fig.2, a central bore 11 smooth and blind, which opens at its free end in a hole 12 of larger diameter.
  • the bottom 13 of the central bore 11 also constitutes the bottom of a recess 14 provided at the end of the connection piece opposite the hole of larger diameter 12, which is intended to receive a touch of color used for locating the connection at its upper end.
  • the connecting piece is advantageously made by bar turning, cold stamping, foundry or other, in one of the usual materials such as Zamak, mild steel, brass, bronze or copper.
  • the connection piece 9 is fixed to the knurled rod 8 at the end of the central electrode of the spark plug by force fitting carried out by exerting a force on the top of the connection piece 9.
  • the connecting piece 9 however benefits from the elimination of the threading operation. This therefore results in a lower manufacturing cost.
  • a spark plug comprising a connection terminal of its central electrode produced according to the invention, responds particularly well to the new quality requirements of car manufacturers by allowing the use at low cost of connections made of good conductive materials such as brass.
  • connection part such as a threaded part without having the disadvantages.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

Spark plug comprising a central electrode (5) and at least one earth electrode (4) defining between them a spark-forming gap (6), the end (8) of the central electrode (5) opposite the spark-forming gap having the shape of a rod carrying a part (9) for connection to an ignition circuit, characterised in that the connection part (9) made from a metal which is a good electrical conductor is force-fitted over the end rod (8) of the central electrode. <IMAGE>

Description

La présente invention est relative aux bougies d'allumage pour moteur à combustion interne et se rapporte plus particulièrement aux moyens de connexion de ces bougies au circuit d'allumage du moteur.The present invention relates to spark plugs for an internal combustion engine and relates more particularly to the means for connecting these spark plugs to the engine ignition circuit.

Une bougie d'allumage comporte généralement une électrode centrale et une électrode de masse isolées l'une de l'autre par un corps en matière isolante telle que de la céramique, les deux électrodes ayant deux extrémités en regard l'une de l'autre qui définissent un intervalle de production d'étincelles.A spark plug generally has a central electrode and a ground electrode insulated from each other by a body made of insulating material such as ceramic, the two electrodes having two ends facing each other. which define a spark generation interval.

A son extrémité opposée destinée à être connectée au circuit d'allumage, la bougie comporte une borne de connexion reliée à l'électrode centrale.At its opposite end intended to be connected to the ignition circuit, the spark plug has a connection terminal connected to the central electrode.

Cette borne est généralement constituée d'une pièce normalisée réalisée jusqu'à présent selon deux techniques connues.This terminal is generally made up of a standardized part produced up to now using two known techniques.

Selon une première technique, la borne de connexion est formée d'une tige dont l'extrémité libre est filetée conformément à la norme ISO 1919-1982. Sur cette extrémité filetée de la tige est montée une pièce de connexion constituée par un écrou ou douille taraudée, conformément à la norme ISO 1919-1982.According to a first technique, the connection terminal is formed of a rod whose free end is threaded in accordance with ISO standard 1919-1982. On this threaded end of the rod is mounted a connection piece consisting of a threaded nut or socket, in accordance with ISO standard 1919-1982.

Selon une seconde technique, la tige d'extrémité de l'électrode et la pièce de connexion sont réalisées en une seule pièce, par frappe à froid ou par décolletage.According to a second technique, the end rod of the electrode and the connection part are produced in one piece, by cold striking or by turning.

La borne de connexion réalisée selon la première technique présente l'inconvénient de se dévisser fréquemment sous l'effet des contraintes vibratoires du moteur à explosion.The connection terminal produced according to the first technique has the drawback of being unscrewed frequently under the effect of the vibration stresses of the internal combustion engine.

La borne de connexion réalisée selon la seconde technique ou borne de connexion "monobloc" présente l'inconvénient, principalement dans la technique de montage des bougies dites " à chaud " ou " à ciment conducteur ", d'être revêtue d'une couche de nickel oxydé par exemple qui rend particulièrement difficile le montage et le démontage des conducteurs d'alimentation électrique de la bougie.The connection terminal produced according to the second technique or "one-piece" connection terminal has the disadvantage, mainly in the technique of mounting so-called "hot" or "conductive cement" candles, of being coated with a layer of nickel oxidized, for example, which makes it particularly difficult to assemble and disassemble the spark plug electrical supply conductors.

L'invention vise à remédier aux inconvénients de la technique antérieure en créant une borne de connexion pour bougie d'allumage qui tout en étant d'un coût de fabrication réduit permette un montage et un démontage facile du conducteur d'alimentation et présente des risques d'oxydation réduits.The invention aims to remedy the drawbacks of the prior art by creating a connection terminal for a spark plug which, while being of reduced manufacturing cost, allows easy assembly and disassembly of the supply conductor and presents risks. reduced oxidation.

Elle a donc pour objet une bougie d'allumage pour moteur à combustion interne comprenant une électrode centrale et au moins une électrode de masse définissant entre elles un intervalle de formation d'étincelles, l'extrémité de l'électrode centrale opposée à l'intervalle de formation d'étincelles se présentant sous la forme d'une tige portant une pièce de connexion à un circuit d'allumage, caractérisée en ce que la pièce de connexion réalisée en métal bon conducteur de l'électricité est emmanchée à force sur la tige d'extrémité de l'électrode centrale.It therefore relates to a spark plug for an internal combustion engine comprising a central electrode and at least one ground electrode defining between them a spark formation interval, the end of the central electrode opposite to the interval forming sparks in the form of a rod carrying a connection piece to an ignition circuit, characterized in that the connection piece made of metal which is a good conductor of electricity is force-fitted onto the rod end of the central electrode.

Suivant une caractéristique particulière de l'invention, la surface extérieure de la tige d'extrémité de l'électrode centrale comporte des reliefs et la pièce de connexion comporte un alésage lisse emmanché à force sur la surface extérieure pourvue desdits reliefs.According to a particular characteristic of the invention, the external surface of the end rod of the central electrode has reliefs and the connection piece comprises a smooth bore force fitted onto the external surface provided with said reliefs.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :

  • la Fig.1 est une vue en élévation et en coupe partielle d'une bougie d'allumage, perfectionnée suivant l'invention; et
  • la Fig.2 est une vue en élévation et en coupe de la pièce de connexion de la bougie d'allumage de la Fig.1.
The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings, in which:
  • Fig.1 is an elevational view in partial section of a spark plug, improved according to the invention; and
  • Fig.2 is an elevational and sectional view of the connecting piece of the spark plug of Fig.1.

Sur la Fig.1, on a représenté une bougie d'allumage 1 comportant un culot métallique 2 pourvu d'un filetage extérieur 3 pour le montage de la bougie et d'une électrode de masse recourbée 4 coopérant avec une électrode centrale 5 pour définir un intervalle 6 de formation d'étincelles.In Fig.1, there is shown a spark plug 1 having a metal base 2 provided with an external thread 3 for mounting the spark plug and a curved mass electrode 4 cooperating with a central electrode 5 to define a spark formation interval 6.

L'électrode de masse 4 isolée de l'électrode centrale 5 par un manchon 7 de matière isolante telle que de la céramique.The ground electrode 4 isolated from the central electrode 5 by a sleeve 7 of insulating material such as ceramic.

A son extrémité opposée à l'intervalle de formation d'étincelle 6, l'électrode centrale 5 comporte une tige 8 qui fait saillie au-delà de l'isolant 7 et qui est destinée à permettre la connexion de la bougie à un circuit d'allumage.At its end opposite to the spark formation interval 6, the central electrode 5 comprises a rod 8 which projects beyond the insulator 7 and which is intended to allow the connection of the spark plug to a circuit d 'ignition.

La tige 8 porte une pièce de connexion 9 de profil extérieur normalisé, destinée à coopérer avec une douille fendue de profil complémentaire ou avec une pince d'un connecteur femelle fixée à l'extrémité d'un conducteur de liaison de la bougie avec le circuit d'allumage (non représenté).The rod 8 carries a connection piece 9 of standardized external profile, intended to cooperate with a split socket of complementary profile or with a clamp of a female connector fixed to the end of a conductor connecting the spark plug with the circuit. ignition (not shown).

La surface extérieure de la tige 8 présente un moletage 10 ou autres reliefs.The outer surface of the rod 8 has knurling 10 or other reliefs.

La pièce de connexion 9 comporte, ainsi qu'on le voit mieux à la Fig.2, un alésage central 11 lisse et borgne, qui débouche à son extrémité libre dans un trou 12 de plus grand diamètre.The connection piece 9 has, as can be seen better in Fig.2, a central bore 11 smooth and blind, which opens at its free end in a hole 12 of larger diameter.

Le fond 13 de l'alésage central 11 constitue également le fond d'un évidement 14 prévu à l'extrémité de la pièce de connexion opposée au trou de plus grand diamètre 12, qui est destiné à recevoir une touche de couleur servant au repèrage de la connexion à son extrémité supérieure.The bottom 13 of the central bore 11 also constitutes the bottom of a recess 14 provided at the end of the connection piece opposite the hole of larger diameter 12, which is intended to receive a touch of color used for locating the connection at its upper end.

La pièce de connexion est avantageusement réalisée par décolletage, frappe à froid, fonderie ou autre, dans l'une des matières habituelles telles que le Zamak, l'acier doux, le laiton, le bronze ou le cuivre. La pièce de connexion 9 est fixée sur la tige moletée 8 d'extrémité de l'électrode centrale de la bougie par emmanchement à force réalisé en exerçant un effort sur le sommet de la pièce de connexion 9.The connecting piece is advantageously made by bar turning, cold stamping, foundry or other, in one of the usual materials such as Zamak, mild steel, brass, bronze or copper. The connection piece 9 is fixed to the knurled rod 8 at the end of the central electrode of the spark plug by force fitting carried out by exerting a force on the top of the connection piece 9.

On obtient ainsi un assemblage qui résiste à un effort d'arrachement supérieur à 100 daN.An assembly is thus obtained which resists a tearing force greater than 100 daN.

Bien que dans l'agencement suivant l'invention, le procédé de fabrication de la tige de connexion 8 ne soit pratiquement pas modifié, la pièce de connexion 9 bénéficie en revanche de la suppression de l'opération de filetage. Il en résulte donc un moindre coût de fabrication.Although in the arrangement according to the invention, the method of manufacturing the connecting rod 8 is practically not modified, the connecting piece 9 however benefits from the elimination of the threading operation. This therefore results in a lower manufacturing cost.

Une bougie d'allumage comportant une borne de connexion de son électrode centrale réalisée suivant l'invention, répond particulièrement bien aux nouvelles prescriptions de qualité des constructeurs automobiles en permettant l'utilisation à moindre coût de connexions en matériaux bons conducteurs comme le laiton.A spark plug comprising a connection terminal of its central electrode produced according to the invention, responds particularly well to the new quality requirements of car manufacturers by allowing the use at low cost of connections made of good conductive materials such as brass.

Elle bénéficie en outre de tous les avantages conférés par une pièce de connexion séparée telle qu'une pièce filetée sans en présenter les inconvénients.It also benefits from all the advantages conferred by a separate connection part such as a threaded part without having the disadvantages.

Claims (4)

Bougie d'allumage pour moteur à combustion interne comprenant une électrode centrale (5) et au moins une électrode de masse (4) définissant entre elles un intervalle de formation d'étincelles (6), l'extrémité (8) de l'électrode centrale (5) opposée à l'intervalle de formation d'étincelles se présentant sous la forme d'une tige portant une pièce (9) de connexion à un circuit d'allumage, caractérisée en ce que la pièce de connexion (9) réalisée en métal bon conducteur de l'électricité est emmanchée à force sur la tige d'extrémité (8) de l'électrode centrale.Spark plug for internal combustion engine comprising a central electrode (5) and at least one ground electrode (4) defining between them a spark formation interval (6), the end (8) of the electrode central unit (5) opposite to the spark formation interval in the form of a rod carrying a part (9) for connection to an ignition circuit, characterized in that the connection part (9) is produced made of metal which is a good conductor of electricity is force-fitted onto the end rod (8) of the central electrode. Bougie d'allumage suivant la revendication 1, caractérisée en ce que la surface extérieure de la tige d'extrémité (8) de l'électrode centrale (5) comporte des reliefs et la pièce de connexion comporte un alésage lisse (11) emmanché à force sur ladite surface extérieure.Spark plug according to Claim 1, characterized in that the external surface of the end rod (8) of the central electrode (5) has reliefs and the connection piece has a smooth bore (11) fitted at force on said outer surface. Bougie d'allumage suivant la revendication 2, caractérisée en ce que lesdits reliefs de la surface extérieure de l'extrémité (8) de l'électrode centrale sont constitués par un moletage.Spark plug according to Claim 2, characterized in that the said reliefs on the external surface of the end (8) of the central electrode consist of a knurling. Bougie d'allumage suivant l'une des revendications 1 à 3, caractérisée en ce que l'alésage (11) de la pièce de connexion est borgne et son fond (13) constitue également le fond d'un évidement (14) de réception d'une marque de repèrage.Spark plug according to one of claims 1 to 3, characterized in that the bore (11) of the connection piece is blind and its bottom (13) also constitutes the bottom of a receiving recess (14) of a registration mark.
EP91402410A 1990-09-26 1991-09-10 Improved spark plug for internal combustion engine Revoked EP0478411B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9011879A FR2667201B1 (en) 1990-09-26 1990-09-26 IMPROVED SPARK PLUG FOR INTERNAL COMBUSTION ENGINE.
FR9011879 1990-09-26

Publications (2)

Publication Number Publication Date
EP0478411A1 true EP0478411A1 (en) 1992-04-01
EP0478411B1 EP0478411B1 (en) 1995-11-22

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ID=9400672

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Application Number Title Priority Date Filing Date
EP91402410A Revoked EP0478411B1 (en) 1990-09-26 1991-09-10 Improved spark plug for internal combustion engine

Country Status (12)

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US (1) US5258684A (en)
EP (1) EP0478411B1 (en)
JP (1) JPH05343155A (en)
AT (1) ATE130707T1 (en)
CS (1) CS292391A3 (en)
DE (1) DE69114806T2 (en)
DK (1) DK0478411T3 (en)
ES (1) ES2083544T3 (en)
FR (1) FR2667201B1 (en)
GR (1) GR3018880T3 (en)
HU (1) HU215814B (en)
IE (1) IE71190B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011015427A3 (en) * 2009-08-03 2011-10-20 Robert Bosch Gmbh Ignition coil, spark plug, and ignition arrangement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5697334A (en) * 1996-02-16 1997-12-16 Alliedsignal Inc. Spark plug with integral retainer nut
US5918571A (en) * 1996-02-16 1999-07-06 Allied Signal Inc. Dual electrode high thread spark plug
US6495948B1 (en) 1998-03-02 2002-12-17 Pyrotek Enterprises, Inc. Spark plug

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635186A (en) * 1921-04-25 1927-07-12 Corning Glass Works Spark plug
US1996421A (en) * 1930-03-13 1935-04-02 Hurley Townsend Corp Spark plug
US3370331A (en) * 1963-04-01 1968-02-27 Zeller Corp Sparkplug and process of manufacturing the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2292216A (en) * 1939-06-29 1942-08-04 James A Doran Spark plug
JPS5337881B2 (en) * 1973-11-15 1978-10-12
DE7726104U1 (en) * 1977-08-23 1977-12-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electric switchgear
JPS62150680A (en) * 1985-12-24 1987-07-04 株式会社デンソー Ignition plug

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635186A (en) * 1921-04-25 1927-07-12 Corning Glass Works Spark plug
US1996421A (en) * 1930-03-13 1935-04-02 Hurley Townsend Corp Spark plug
US3370331A (en) * 1963-04-01 1968-02-27 Zeller Corp Sparkplug and process of manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011015427A3 (en) * 2009-08-03 2011-10-20 Robert Bosch Gmbh Ignition coil, spark plug, and ignition arrangement
US9194359B2 (en) 2009-08-03 2015-11-24 Robert Bosch Gmbh Ignition coil, spark plug, and ignition set-up including an ignition coil and spark plug

Also Published As

Publication number Publication date
DE69114806D1 (en) 1996-01-04
ATE130707T1 (en) 1995-12-15
US5258684A (en) 1993-11-02
CS292391A3 (en) 1992-04-15
ES2083544T3 (en) 1996-04-16
FR2667201B1 (en) 1996-09-20
EP0478411B1 (en) 1995-11-22
HUT58956A (en) 1992-03-30
FR2667201A1 (en) 1992-03-27
JPH05343155A (en) 1993-12-24
HU913034D0 (en) 1992-01-28
IE913367A1 (en) 1992-04-08
DE69114806T2 (en) 1996-05-02
HU215814B (en) 1999-02-01
DK0478411T3 (en) 1995-12-18
GR3018880T3 (en) 1996-05-31
IE71190B1 (en) 1997-02-12

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