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EP0401598B1 - Electrode centrale pour bougies d'allumage de moteurs à combustion interne - Google Patents

Electrode centrale pour bougies d'allumage de moteurs à combustion interne Download PDF

Info

Publication number
EP0401598B1
EP0401598B1 EP90109777A EP90109777A EP0401598B1 EP 0401598 B1 EP0401598 B1 EP 0401598B1 EP 90109777 A EP90109777 A EP 90109777A EP 90109777 A EP90109777 A EP 90109777A EP 0401598 B1 EP0401598 B1 EP 0401598B1
Authority
EP
European Patent Office
Prior art keywords
centre electrode
electrode according
separation layer
silver
formation
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
EP90109777A
Other languages
German (de)
English (en)
Other versions
EP0401598A1 (fr
Inventor
Friedrich E. Dipl-Ing. Schneider
Peter Dr. Rer. Nat. Dipl.-Ing. Tautzenberger
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.)
G RAU GmbH and Co KG
Original Assignee
G RAU GmbH and Co KG
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 G RAU GmbH and Co KG filed Critical G RAU GmbH and Co KG
Publication of EP0401598A1 publication Critical patent/EP0401598A1/fr
Application granted granted Critical
Publication of EP0401598B1 publication Critical patent/EP0401598B1/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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/39—Selection of materials for electrodes

Definitions

  • This formation of one or more separating layers enables the production of a copper-silver composite electrode, whereby a reduction in the use of noble metals by at least 50% can be achieved compared to the previously known solid silver center electrode.
  • Copper is preferably used as the core material and silver as the material of the cladding.
  • silver is preferably used as the core material and silver as the material of the cladding.
  • highly heat-conducting base metallic materials or alloys as the core material and silver or silver alloys with predominantly silver content can also be used advantageously.
  • AuNi alloys can also be used advantageously as the only separating layer to prevent the passage of oxygen and the interdiffusion between the core material and the casing.
  • FIG. 1 shows a spark plug in which a center electrode 2 is inserted into an insulating body 1.
  • the insulating body 1 is connected to a metallic screw-in part 3, which has a ground electrode 5 at the front end of a threaded section 4.
  • the sheathing of the core material can be carried out in various known processing methods, for example by deep drawing and common extrusion molding. This can result in different shapes at the interface between the core and the silver coating.

Landscapes

  • Spark Plugs (AREA)

Claims (14)

1. - Electrode centrale pour bougies d'allumage de moteurs à combustion interne, comprenant un noyau (7) constitué d'un métal commun bon conducteur de chaleur qui est muni, dans la région de la pointe d'allumage, d'une enveloppe en métal précieux (8) constituée d'argent et respectivement d'un alliage d'argent avec une proportion d'argent prépondérante, caractérisée en ce qu'à la surface de séparation entre le matériau du noyau (7) et l'enveloppe (8) est prévue au moins une couche de séparation (9) imperméable à l'oxygène et empêchant la formation d'un système eutectique entre le matériau du noyau et le matériau de l'enveloppe.
2. - Electrode centrale selon la revendication 1, caractérisée en ce qu'au moins une couche de séparation (9) imperméanle à l'oxygène est combinée avec au moins une couche de séparation supplémentaire pour empêcher la formation d'un système eutectique.
3. - Electrode centrale selon la revendication 1, caractérisée en ce que l'enveloppe (8) contient des additifs d'alliage qui suppriment et respectivement réduisent la solubilité de l'argent à l'égard de l'oxygène.
4. - Electrode centrale selon la revendication 3, caractérisée en ce que l'enveloppe (8) est constituée d'un alliage AgSi avec une teneur en silicium de 0,0-5 à 0,3 % en poids.
5. - Electrode centrale selon l'une des revendications 1 ou 2, caractérisée en ce que la couche de séparation (9) destinée à empêcher la formation d'un système eutectique est constituée de tantale.
6. - Electrode centrale selon l'une des revendications 1 ou 2, caractérisée en ce que la couche de séparation (9) destinée à empêcher la formation d'un système eutectique est constituée de fer.
7. - Electrode centrale selon l'une des revendications 1 ou 2, caractérisée en ce que la couche de séparation (9) destinée à empêcher la formation d'un système eutectique est constituée de nickel.
8. - Electrode centrale selon l'une des revendications 1 ou 2, caractérisée en ce que la couche de séparation (9) destinée à empêcher la formation d'un système eutectique est constituée d'un alliage AgSn.
9. - Electrode centrale selon la revendication 1, caractérisée en ce qu'elle comprend comme couche de séparation (9) une couche (9) unique imperméable à l'oxygène et empêchant l'interdiffusion du matériau du noyau (7) et du matériau de l'enveloppe (8).
10. - Electrode centrale selon la revendication 9, caractérisée en ce que la couche de séparation (9) est constituée de platine.
11. Electrode centrale selon la revendication 9, caractérisée en ce que la couche de séparation (9) est constituée d'un alliage AuNi.
12. - Electrode centrale selon la revendication 1, caractérisée en ce que l'épaisseur de la couche de séparation (9) unique est inférieure à 50 µm.
13. - Electrode centrale selon la revendication 1, caractérisée en ce que la section transversale de l'enveloppe d'argent diminue avec l'augmentation de la distance par rapport à la pointe d'allumage.
14. - Electrode centrale selon la revendication 1, caractérisée en ce que le matériau du noyau est constitué de cuivre.
EP90109777A 1989-06-05 1990-05-23 Electrode centrale pour bougies d'allumage de moteurs à combustion interne Expired - Lifetime EP0401598B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3918278 1989-06-05
DE3918278A DE3918278A1 (de) 1989-06-05 1989-06-05 Mittelelektrode fuer zuendkerzen und brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0401598A1 EP0401598A1 (fr) 1990-12-12
EP0401598B1 true EP0401598B1 (fr) 1992-10-28

Family

ID=6382088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109777A Expired - Lifetime EP0401598B1 (fr) 1989-06-05 1990-05-23 Electrode centrale pour bougies d'allumage de moteurs à combustion interne

Country Status (3)

Country Link
US (1) US5107169A (fr)
EP (1) EP0401598B1 (fr)
DE (2) DE3918278A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845018C1 (de) * 1998-09-30 1999-12-16 Fein C & E Kraftgetriebener Schrauber

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203250A1 (de) * 1992-02-05 1993-08-12 Beru Werk Ruprecht Gmbh Co A Silber-nickel-verbundwerkstoff fuer elektrische kontakte und elektroden
DE69320850T2 (de) * 1992-03-03 1999-02-04 Ngk Spark Plug Co., Ltd., Nagoya, Aichi Zündaussetzungsdetektor für eine Brennkraftmaschine
JP2853111B2 (ja) * 1992-03-24 1999-02-03 日本特殊陶業 株式会社 スパークプラグ
US9083156B2 (en) 2013-02-15 2015-07-14 Federal-Mogul Ignition Company Electrode core material for spark plugs
DE102014109532B4 (de) 2013-07-08 2020-04-23 Borgwarner Ludwigsburg Gmbh Koronazündeinrichtung
DE102013226163A1 (de) * 2013-12-17 2015-06-18 Robert Bosch Gmbh Zündkerzenelektrode und Zündkerze mit reduziertem korrosivem Verschleiß und Verfahren zur Herstellung einer Zündkerzenelektrode
JP7151350B2 (ja) * 2017-10-19 2022-10-12 株式会社デンソー 内燃機関用の点火プラグ
DE102023213206A1 (de) * 2023-12-21 2025-06-26 Robert Bosch Gesellschaft mit beschränkter Haftung Zündkerzenelektrode mit edelmetall-haltigen Zündelement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE354850C (de) * 1922-06-16 Jan Pieter Reijnhout Verfahren zur Erhoehung der Lebensdauer der Elektroden fuer Zuendkerzen von Verbrennungskraftmaschinen
US1515866A (en) * 1922-06-24 1924-11-18 Lena J Marten Spark plug
US2321840A (en) * 1942-01-23 1943-06-15 Gen Motors Corp Spark plug and method of making same
US2783409A (en) * 1952-03-31 1957-02-26 Gen Motors Corp Spark plug electrode and process for making same
JPS48103445A (fr) * 1972-04-14 1973-12-25
DE3730627A1 (de) * 1986-09-12 1988-03-24 Ngk Spark Plug Co Mittelelektrodenanordnung fuer eine zuendkerze

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845018C1 (de) * 1998-09-30 1999-12-16 Fein C & E Kraftgetriebener Schrauber

Also Published As

Publication number Publication date
DE59000401D1 (de) 1992-12-03
DE3918278A1 (de) 1990-12-06
EP0401598A1 (fr) 1990-12-12
US5107169A (en) 1992-04-21

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