EP1110284B1 - Zündkerzenelektrode - Google Patents

Zündkerzenelektrode Download PDF

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Publication number
EP1110284B1
EP1110284B1 EP99968269A EP99968269A EP1110284B1 EP 1110284 B1 EP1110284 B1 EP 1110284B1 EP 99968269 A EP99968269 A EP 99968269A EP 99968269 A EP99968269 A EP 99968269A EP 1110284 B1 EP1110284 B1 EP 1110284B1
Authority
EP
European Patent Office
Prior art keywords
metal part
noble metal
spark plug
plug electrode
electrode
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
EP99968269A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1110284A1 (de
Inventor
Heinz Ulm
Rainer Kocik
Stephan Weigel
Jochen Fischer
Peter Metzler
Detlef Hartmann
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1110284A1 publication Critical patent/EP1110284A1/de
Application granted granted Critical
Publication of EP1110284B1 publication Critical patent/EP1110284B1/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
    • 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

  • the present invention relates to a spark plug electrode, at their spark outlet or spark entry surface erosion-resistant precious metal is applied.
  • Precious metal such as platinum or a platinum alloy causes a much longer service life of the electrodes, those in the combustion chamber due to the prevailing conditions there exposed to very strong corrosion and erosion loads are. For cost reasons, it is not yet provided for To produce a spark plug electrode entirely from precious metal. But a lot of possibilities have already been found to refine a spark plug electrode.
  • DE 3 727 526 describes a method of manufacturing a spark plug for Internal combustion engines, in which a precious metal plate the front of the center or ground electrodes by means of Laser welding associated with the material of the electrode becomes.
  • WO-A-9525372 discloses a spark plug electrode according to the preamble of claim 1 and their manufacturing process.
  • the invention relates to a spark plug electrode, according to claim 1 and a manufacturing method according to claim 3.
  • the use of a precious metal particle for welding on the spark plug electrode, which is smooth on the one hand Surface and the opposite a profiled Has surface has the advantage that the profiled Surface during the welding process due to the smaller Contact area has a high contact resistance between Has precious metal part and electrode, which in the Welding zone between the precious metal part and the Spark plug electrode a correspondingly high thermal energy arises.
  • the provision of a smooth surface of the Precious metal particle on the welding electrode facing Side again has the advantage that here is a small one There is contact resistance and on this Place less heat than at the welding point. With the present design of the welded joint is a Gaping and the associated corrosion of the Welded connection between the precious metal part and the electrode largely avoided.
  • the profiling in such a way that the contact surfaces between Precious metal part and center electrode at the beginning of the Welding process only in the edge area of the precious metal particle exist, has the advantage that the heating of the welding precious metal part starting from the edge area grows towards the center and due to the star-shaped Structure the remaining air between the precious metal part and electrode can escape via radial channels.
  • the Welding temperature is relatively even across the entire cross section and can be particularly in critical marginal area to the desired high values to be brought.
  • the durability of the welded joint is significantly increased, which in turn increases the lifespan the spark plug has a positive effect.
  • FIG. 1 shows the spark plug electrode and the Precious metal part according to the invention before the welding process
  • Figure 2 is a plan view of the profiled side of the Precious metal particle
  • Figures 3a, 3b, 4a, 4b, 5a and 5b the individual process steps for producing the profiled precious metal part and its welding the spark plug electrode.
  • FIG. 1 shows a spark plug electrode 10 in section and a precious metal part 11, which on the front side of the Spark plug electrode 10 is attached.
  • This precious metal part 11 has a smooth end face 12 and a profiled Front 13 on.
  • the precious metal part 11 is so arranged that it with its profiled side 13 on the Spark plug electrode 10 rests.
  • On the Spark plug electrode 10 opposite side with smoother Surface 12 of the precious metal 11 is schematically the Welding electrode 14 shown.
  • FIG. 2 To clarify the design of the profiled surface 13 of the precious metal 11 should be used Figure 2.
  • the Profiling of the precious metal particle 11 is designed that between the spark plug electrode 10 and the Precious metal part 11, the contact surface 20 on the outer edge of the Precious metal particle 11 are located.
  • a star-shaped profile was chosen here, the ensures that only the outer areas first with the Spark plug electrode 10 form a contact surface 20.
  • a precious metal wire 30 is, for example Platinum wire so guided by a holding part 31 that the Precious metal wire 30 on the other hand checked out this holder 31 protrudes. About a setting or too Preselection of the protrusion of the precious metal part can be the length of the precious metal part can be determined.
  • a shearing tool 32 is now the section of Precious metal wire 30 sheared out of the holding part 31st protrudes.
  • FIG. 3b shows the noble metal wire 30 a precious metal cutling 40 has already been sheared off. This shear method can also be used for relative small wire diameter a fairly large length of the Realize precious metal cutling 40.
  • the ratio of Length to diameter of the precious metal hemlock is advantageously greater than 1.
  • the precious metal cutling 40 is not in one embossing tool between two stamps 41 and 42 arranged and is used to enlarge the diameter or reduction in length compressed.
  • this setting process is a first die 41 with a smooth surface and a second stamp 42 with a profiled Surface provided.
  • the precious metal cutling 40 will due to this arrangement during the in Figure 4b the setting process shown in the figure 1 explained shape, i.e. a surface has one smooth or flat shape and the opposite Surface of the precious metal part 11 has a profiled Surface.
  • the noble metal part 11 thus shaped is now, as in FIG. 5a shown on the spark plug electrode 10 for example put a center electrode in such a way that the side with the smooth surface 12 of the welding electrode 14 opposite. This is between the one to be welded Precious metal part 11 and the welding electrode 14 a good one Given contact area with low contact resistance.
  • the profiled end face 13 of the precious metal part 11 is the Spark plug electrode arranged opposite, so that between the spark plug electrode and the precious metal part 11 for the welding process advantageous high contact resistance given is.
  • the welding process itself is preferably carried out two-stage, with the profile tips in a first stage the contact surfaces 20 with a relatively low current be welded. This will make it even Starting conditions created for the second welding stage. In the second welding stage, the precious metal is coated with a higher current strength up to the full-surface connection with the Welded electrode.
  • connection is spark plug electrode 10 and Precious metal part 11 shown after the welding process.
  • This welded bond can now be further Processing stages are fed. That's the way it is for example conceivable when used as Center electrode this composite in its edge area bevel to ensure that the precious metal particle furthest to the opposite electrode of the Spark plug reaches.
  • the method described allows a largely free Design of the precious metal part on the spark plug electrode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
EP99968269A 1998-08-25 1999-04-09 Zündkerzenelektrode Expired - Lifetime EP1110284B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19838538 1998-08-25
DE19838538A DE19838538A1 (de) 1998-08-25 1998-08-25 Zündkerzenelektrode
PCT/DE1999/001072 WO2000013274A1 (de) 1998-08-25 1999-04-09 Zündkerzenelektrode

Publications (2)

Publication Number Publication Date
EP1110284A1 EP1110284A1 (de) 2001-06-27
EP1110284B1 true EP1110284B1 (de) 2004-07-07

Family

ID=7878618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99968269A Expired - Lifetime EP1110284B1 (de) 1998-08-25 1999-04-09 Zündkerzenelektrode

Country Status (5)

Country Link
US (1) US6630771B1 (enExample)
EP (1) EP1110284B1 (enExample)
JP (1) JP2002524821A (enExample)
DE (2) DE19838538A1 (enExample)
WO (1) WO2000013274A1 (enExample)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10230269B3 (de) * 2002-07-05 2004-02-12 Robert Bosch Gmbh Zündkerze
US7049733B2 (en) * 2003-11-05 2006-05-23 Federal-Mogul Worldwide, Inc. Spark plug center electrode assembly
DE102006009790A1 (de) * 2006-03-01 2007-09-06 Beru Ag Verfahren zum Armieren eines Endes einer Mittelelektrode einer Zündkerze
JP4603005B2 (ja) * 2007-03-28 2010-12-22 日本特殊陶業株式会社 スパークプラグの製造方法
DE102010014325B4 (de) * 2010-04-09 2018-07-05 Federal-Mogul Ignition Gmbh Verfahren zum Herstellen einer Zündkerze und dadurch hergestellte Zündkerze
US9041274B2 (en) * 2013-01-31 2015-05-26 Federal-Mogul Ignition Company Spark plug having firing pad
JP6310497B2 (ja) * 2016-05-10 2018-04-11 日本特殊陶業株式会社 スパークプラグ
US9913359B1 (en) 2016-08-17 2018-03-06 General Electric Company Krypton-85-free spark gap with cantilevered component
CN110514964B (zh) * 2019-09-05 2021-10-01 国网内蒙古东部电力有限公司检修分公司 一种特高压直流输电系统接地极线路故障测距方法
EP4312326A1 (de) 2022-07-22 2024-01-31 Heraeus Deutschland GmbH & Co. KG Zündkerzenelektrode mit additiv gefertigter platingruppenmetallspitze

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3727526A1 (de) 1987-08-18 1989-03-02 Bosch Gmbh Robert Verfahren zum herstellen einer zuendkerze fuer brennkraftmaschinen
US5856724A (en) * 1994-02-08 1999-01-05 General Motors Corporation High efficiency, extended life spark plug having shaped firing tips
US5456624A (en) * 1994-03-17 1995-10-10 Alliedsignal Inc. Spark plug with fine wire rivet firing tips and method for its manufacture
US6346766B1 (en) * 1998-05-20 2002-02-12 Denso Corporation Spark plug for internal combustion engine and method for manufacturing same

Also Published As

Publication number Publication date
WO2000013274A1 (de) 2000-03-09
EP1110284A1 (de) 2001-06-27
JP2002524821A (ja) 2002-08-06
DE19838538A1 (de) 2000-03-02
US6630771B1 (en) 2003-10-07
DE59909919D1 (de) 2004-08-12

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