EP0262005A1 - 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
EP0262005A1
EP0262005A1 EP87401875A EP87401875A EP0262005A1 EP 0262005 A1 EP0262005 A1 EP 0262005A1 EP 87401875 A EP87401875 A EP 87401875A EP 87401875 A EP87401875 A EP 87401875A EP 0262005 A1 EP0262005 A1 EP 0262005A1
Authority
EP
European Patent Office
Prior art keywords
electrode
cup
platinum tip
platinum
bimetallic
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
EP87401875A
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English (en)
French (fr)
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EP0262005B1 (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
Original Assignee
Eyquem Dite Ste
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 Eyquem Dite Ste filed Critical Eyquem Dite Ste
Publication of EP0262005A1 publication Critical patent/EP0262005A1/de
Application granted granted Critical
Publication of EP0262005B1 publication Critical patent/EP0262005B1/de
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
    • 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 bimetallic central electrodes with a platinum point for electric spark plugs of heat engines.
  • the two functions of a 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 piece of copper 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 piece of copper forms a core which is used for heat dissipation, 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 part of the protruding electrode out of the insulator.
  • This platinum tip can be welded electrically or according to another manufacturing process, crimped onto the bimetallic electrode with a copper core.
  • Bimetallic electrodes with crimped platinum wire are also known, extending over the entire length of the electrode.
  • the invention aims to remedy these drawbacks by proposing a method of fixing a platinum tip on a central electrode.
  • the invention also relates to a bimetallic central electrode with a platinum tip for a spark plug produced according to the process defined above.
  • 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.
  • Fig. 2 The result of the following two operations is shown in Fig. 2.
  • the platinum tip 2 the melting point of which is around 1770 ° C., is electrically welded to the cup 1, the melting point of which is around 1400 ° C., and is fixed firmly to this cup by a solder 4 at high temperature ( envy 1200 ° C) carried out under vacuum. Then, a cylindrical piece of copper 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 piece 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.
  • a platinum tip 10 having a reduced length compared to the length of the platinum tip already described, is electrically welded and brazed.
  • 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)
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 true EP0262005A1 (de) 1988-03-30
EP0262005B1 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012339A1 (en) * 1988-06-06 1989-12-14 Allied-Signal Inc. Method for manufacturing electrodes for a spark plug
WO1991002393A1 (en) * 1989-08-11 1991-02-21 Ford Motor Company Limited Forming an erosion resistant tip on an electrode
EP0624938A1 (de) * 1993-04-26 1994-11-17 Ngk Spark Plug Co., Ltd Zündkerzenelektrode zur Anwendung in einem Verbrennungsmotor
EP0901150A3 (de) * 1997-09-04 1999-04-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Eleltrode und Verfarhen sowie Vorrichtung zur Herstellung derselben

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US5675209A (en) * 1995-06-19 1997-10-07 Hoskins Manufacturing Company Electrode material for a spark plug
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3433683A1 (de) * 1983-09-13 1985-06-20 Ngk Spark Plug Co., Ltd., Nagoya, Aichi Verfahren zur herstellung einer mittelelektrode fuer eine zuendkerze
EP0171994A1 (de) * 1984-08-07 1986-02-19 NGK Spark Plug Co. Ltd. Zündkerze
BE904355A (fr) * 1985-03-11 1986-06-30 Champion Spark Plug Co Procede de production d'une ebauche d'electrode centrale composite pour bougie d'allumage.

Family Cites Families (6)

* 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
US4705486A (en) * 1986-11-24 1987-11-10 Allied Corporation Method for manufacturing a center electrode for a spark plug

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3433683A1 (de) * 1983-09-13 1985-06-20 Ngk Spark Plug Co., Ltd., Nagoya, Aichi Verfahren zur herstellung einer mittelelektrode fuer eine zuendkerze
EP0171994A1 (de) * 1984-08-07 1986-02-19 NGK Spark Plug Co. Ltd. Zündkerze
BE904355A (fr) * 1985-03-11 1986-06-30 Champion Spark Plug Co Procede de production d'une ebauche d'electrode centrale composite pour bougie d'allumage.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012339A1 (en) * 1988-06-06 1989-12-14 Allied-Signal Inc. Method for manufacturing electrodes for a spark plug
WO1991002393A1 (en) * 1989-08-11 1991-02-21 Ford Motor Company Limited Forming an erosion resistant tip on an electrode
EP0624938A1 (de) * 1993-04-26 1994-11-17 Ngk Spark Plug Co., Ltd Zündkerzenelektrode zur Anwendung in einem Verbrennungsmotor
EP0901150A3 (de) * 1997-09-04 1999-04-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Eleltrode und Verfarhen sowie Vorrichtung zur Herstellung derselben
US6109995A (en) * 1997-09-04 2000-08-29 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh Electrode for a high-pressure discharge lamp, and methods of its manufacture

Also Published As

Publication number Publication date
FR2603749B1 (fr) 1992-06-05
ES2015078B3 (es) 1990-08-01
JPS63133476A (ja) 1988-06-06
FR2603749A1 (fr) 1988-03-11
US4803395A (en) 1989-02-07
EP0262005B1 (de) 1990-06-06
DE3763123D1 (de) 1990-07-12

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