EP0262005B1 - Herstellungsverfahren für eine bimetallische Mittelelektrode mit einem Platinstift für Zündkerze und Elektrode, hergestellt nach diesem Verfahren - Google Patents

Herstellungsverfahren für eine bimetallische Mittelelektrode mit einem Platinstift für Zündkerze und Elektrode, hergestellt nach diesem Verfahren Download PDF

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Publication number
EP0262005B1
EP0262005B1 EP87401875A EP87401875A EP0262005B1 EP 0262005 B1 EP0262005 B1 EP 0262005B1 EP 87401875 A EP87401875 A EP 87401875A EP 87401875 A EP87401875 A EP 87401875A EP 0262005 B1 EP0262005 B1 EP 0262005B1
Authority
EP
European Patent Office
Prior art keywords
cup
electrode
platinum
tip
platinum tip
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
EP87401875A
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English (en)
French (fr)
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EP0262005A1 (de
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.)
Eyquem Dite Ste
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Eyquem Dite Ste
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Filing date
Publication date
Application filed by Eyquem Dite Ste filed Critical Eyquem Dite Ste
Publication of EP0262005A1 publication Critical patent/EP0262005A1/de
Application granted granted 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
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs

Definitions

  • the invention relates to a method for manufacturing a bimetallic central electrode with a platinum tip for a spark plug, comprising inserting a copper insert (5) into a nickel cup (1), extruding the cup-mer assembly. , to shape it to obtain a bimetallic electrode, and to fix a point of platinum (2) on the nickel cup (1).
  • the two functions of an electric engine spark plug are to ignite a spark between the active central electrode and the ground electrode and to evacuate the calories from the combustion chamber.
  • the construction of the central electrode is therefore of great importance for the above-mentioned functions.
  • Processes are known for manufacturing bimetallic electrodes, essentially consisting of three operations well defined by the prior art.
  • a cup is formed from an alloyed nickel wire.
  • a copper insert is introduced into the cup and in a third operation, the cup and the piece are extruded to obtain an electrode which can be used as active central electrode in a spark plug.
  • the copper insert forms a core which is used for the dissipation of heat, which is necessary because the working temperature in the part exposed to the combustion of gases reaches more than 800 ° C.
  • a platinum tip is fixed on the alloy nickel cup constituting with the end of the cup a part of the electrode which projects out of the insulator.
  • This platinum tip can be welded electrically or according to another manufacturing process, crimped on the bimetallic electrode with a copper core.
  • Bimetallic electrodes with crimped platinum wire are also known, extending over the entire length of the electrode.
  • EP-A 0 171 994 describes a method of fixing a platinum tip on a pre-assembled bimetallic electrode consisting of a nickel cup into which a copper core has been introduced.
  • This fixing process consists of electrical resistance welding.
  • a precious metal tip in the form of a thin cylindrical wire is welded to the front end face of the electrode and is simultaneously subjected to a pressure intended to deform the precious metal tip on the welded surface. to define a flange portion.
  • the contact surface of the precious metal tip is thus widened in order to provide a relatively large contact surface between the tip and the bimetallic electrode to improve the poor resistance of the precious metal tip over time.
  • the invention aims to remedy these drawbacks by proposing a method of fixing a platinum tip on a central electrode.
  • Fig. 1 shows the result of the first two operations of the method of the invention, according to which a cylindrical cup 1 is formed from an alloyed nickel wire, not shown, and a central tip of platinum 2, preferably cylindrical, is electrically welded in 3 at the end of the cup 1.
  • the result of the following two operations is shown in FIG. 2.
  • the platinum tip 2 the melting point of which is approximately 1770 ° C, is electrically welded to the cup 1, the melting point of which is approximately 1400 ° C, and securely attached to this cup the by a solder 4 at high temperature (about 1200 ° C) carried out under vacuum.
  • a cylindrical copper insert 5 is introduced into the cup.
  • Fig.3 shows an electrode blank obtained by extruding the assembly formed by the alloyed nickel cup 1 and the copper insert 5 which forms an elongated core 5, always cylindrical inside the cup 1, the platinum tip 2 and the solder 4 retaining their shape at the center of the closed end of the cup.
  • the extrusion operation is followed by forming the electrode according to Fig. 4.
  • the open end 6 of the cup shown in Fig.3, is cut to establish the desired length of the electrode.
  • a collar 7 for holding the electrode is formed in the channel of the insulator of a spark plug (not shown).
  • the bimetallic electrode is then finished.
  • the platinum tip 2 can then be crushed, as shown in Fig.5, to present a larger active spark area 8.
  • Figs. 6 and 7 show another embodiment of the method according to the invention providing an improvement to the method described with reference to Figs 1 to 5.
  • the cup 1 is formed with an axial stud 9 made from one piece, on which a platinum tip 10 having a reduced length compared to the length of the platinum tip already described, is electrically welded and brazed. It is thus possible to reduce the length of inactive platinum present in the solder and since platinum is a very expensive precious metal, it is advantageous to be able in this way to reduce up to 50% the quantity of noble material used compared to the quantities required according to known methods.
  • a copper insert 5 is introduced into the cup, as shown in Fig. 7 and already described with reference to Fig. 2.
  • the method according to the invention therefore gives the possibility of carrying out the brazing of a platinum point on a cup of alloyed nickel and one thus obtains an electrode with platinum point mounted and fixed in a reliable and durable manner. This results in the longevity of a spark plug provided with such an electrode being improved at the same time as the manufacturing costs of the electrode are reduced.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)

Claims (3)

1. Verfahren zur Herstellung einer bimetallischen Mittelelektrode mit Platinspitze für Zündkerze, das darin besteht, ein Kupfereinsatzstück (5) in eine Kapsel aus Nickel (1) einzuführen, die Einheit Kapsel-Einsatzstück zu extrudieren, sie in Form zu bringen, um eine bimetallische Elektrode zu erhalten, und eine Platinspitze (2) auf der Kapsel aus Nickel (1) zu befestigen, dadurch gekennzeichnet, daß der Arbeitsgang zur Befestigung der Platinspitze (2) vor der Einführung des Kupfereinsatzstücks (5) in die Kapsel (1) vorgenommen wird und eine erste Stufe, die aus der Positionierung der Platinspitze auf der Kapsel aus Nickel durch elektrisches Schweißen besteht, und eine zweite Stufe aufweist, die aus der endgültigen Befestigung der Platinspitze auf der vom Kupfereinsatzstück freien Kapsel durch Hartlöten unter Vakuum besteht.
2. Verfahren nach dem Anspruch 1, dadurch gekennzeichnet, daß man die Kapsel aus Nickel (1) mit einem axialen Ansatz (9) ausbildet und anschließend die Platinspitze (10) auf dem Ansatz (9) anfügt.
3. Verfahren nach dem Anspruch 1 oder 2, dadurch gekennzeichnet, daß man die Platinspitze (2; 10) nach der Formgebung quetscht, um eine abgeflachte Zündfunkenoberfläche (8) zu erhalten.
EP87401875A 1986-09-08 1987-08-12 Herstellungsverfahren für eine bimetallische Mittelelektrode mit einem Platinstift für Zündkerze und Elektrode, hergestellt nach diesem Verfahren Expired - Lifetime EP0262005B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8612558 1986-09-08
FR8612558A FR2603749B1 (fr) 1986-09-08 1986-09-08 Procede de fabrication d'une electrode centrale bimetallique a pointe de platine pour bougie d'allumage et electrode obtenue selon ce procede

Publications (2)

Publication Number Publication Date
EP0262005A1 EP0262005A1 (de) 1988-03-30
EP0262005B1 true EP0262005B1 (de) 1990-06-06

Family

ID=9338770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401875A Expired - Lifetime EP0262005B1 (de) 1986-09-08 1987-08-12 Herstellungsverfahren für eine bimetallische Mittelelektrode mit einem Platinstift für Zündkerze und Elektrode, hergestellt nach diesem Verfahren

Country Status (6)

Country Link
US (1) US4803395A (de)
EP (1) EP0262005B1 (de)
JP (1) JPS63133476A (de)
DE (1) DE3763123D1 (de)
ES (1) ES2015078B3 (de)
FR (1) FR2603749B1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4810220A (en) * 1988-06-06 1989-03-07 Allied-Signal Inc. Method for manufacturing electrodes for a spark plug
GB2234920A (en) * 1989-08-11 1991-02-20 Ford Motor Co Forming an erosion resistant tip on an electrode
US5081563A (en) * 1990-04-27 1992-01-14 International Business Machines Corporation Multi-layer package incorporating a recessed cavity for a semiconductor chip
JPH05234662A (ja) * 1991-12-27 1993-09-10 Ngk Spark Plug Co Ltd スパークプラグ用電極およびその製造方法
JP2853108B2 (ja) * 1992-06-17 1999-02-03 日本特殊陶業 株式会社 スパークプラグ
JP3315462B2 (ja) * 1993-04-26 2002-08-19 日本特殊陶業株式会社 スパークプラグ
US5675209A (en) * 1995-06-19 1997-10-07 Hoskins Manufacturing Company Electrode material for a spark plug
DE19738574A1 (de) * 1997-09-04 1999-03-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektrode und Verfahren sowie Vorrichtung zur Herstellung derselben
JP4220218B2 (ja) * 2002-10-25 2009-02-04 株式会社デンソー スパークプラグ用中心電極の製造方法
KR100973026B1 (ko) 2007-08-14 2010-08-03 주식회사 유라테크 점화 플러그 제조방법
KR100960281B1 (ko) 2009-12-24 2010-06-07 주식회사 유라테크 점화 플러그 제조방법 및 그 장치

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB976798A (de) *
US2955222A (en) * 1958-06-25 1960-10-04 Bosch Gmbh Robert Center electrode structure for spark plugs and process for making the same
US3332140A (en) * 1964-05-22 1967-07-25 Nippon Denso Co Process for fixing contact point
US3548239A (en) * 1968-09-03 1970-12-15 Champion Spark Plug Co Spark plug electrode construction
US4699600A (en) * 1981-04-30 1987-10-13 Nippondenso Co., Ltd. Spark plug and method of manufacturing the same
US4904216A (en) * 1983-09-13 1990-02-27 Ngk Spark Plug Co., Ltd. Process for producing the center electrode of spark plug
US4700103A (en) * 1984-08-07 1987-10-13 Ngk Spark Plug Co., Ltd. Spark plug and its electrode configuration
US4684352A (en) * 1985-03-11 1987-08-04 Champion Spark Plug Company Method for producing a composite spark plug center electrode
US4705486A (en) * 1986-11-24 1987-11-10 Allied Corporation Method for manufacturing a center electrode for a spark plug

Also Published As

Publication number Publication date
US4803395A (en) 1989-02-07
FR2603749B1 (fr) 1992-06-05
FR2603749A1 (fr) 1988-03-11
JPS63133476A (ja) 1988-06-06
EP0262005A1 (de) 1988-03-30
DE3763123D1 (de) 1990-07-12
ES2015078B3 (es) 1990-08-01

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