EP0505368B1 - Verfahren zur herstellung von elektroden für zündkerzen sowie zündkerzen-elektroden - Google Patents

Verfahren zur herstellung von elektroden für zündkerzen sowie zündkerzen-elektroden Download PDF

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Publication number
EP0505368B1
EP0505368B1 EP90916240A EP90916240A EP0505368B1 EP 0505368 B1 EP0505368 B1 EP 0505368B1 EP 90916240 A EP90916240 A EP 90916240A EP 90916240 A EP90916240 A EP 90916240A EP 0505368 B1 EP0505368 B1 EP 0505368B1
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EP
European Patent Office
Prior art keywords
electrode
erosion
initial part
shell
resistant
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
EP90916240A
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German (de)
English (en)
French (fr)
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EP0505368A1 (de
Inventor
Jürgen TREIBER
Rainer Noack
Klaus-Dieter Pohl
Willi Frank
Volker Brendick
Hans Hubert
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C33/00—Feeding extrusion presses with metal to be extruded ; Loading the dummy block
    • B21C33/004—Composite billet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals
    • 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 producing spark plug electrodes according to the preamble of the main claim.
  • a method for producing spark plug electrodes is already known from US Pat. No. 2,955,222, in which a composite body, which is composed of three starting parts of different materials, is extruded to form a spark plug center electrode;
  • the composite body has a rivet-shaped, noble metal ignition section which, with its countersunk head and part of its shaft, fills the through hole of a nickel round blank, and a copper round blank of the same diameter is soldered onto the side of the nickel round blank that receives the head of the ignition section.
  • the copper output part then forms the electrode core of high thermal conductivity and the nickel output part forms the corrosion-resistant electrode jacket, from the bottom of the combustion chamber on which the ignition section protrudes in the form of a rod.
  • the ignition section of this center electrode allows good accessibility of the fuel vapor-air mixture to the spark gap of the spark plug, but its attachment to the center electrode is in need of improvement when used for modern high-performance internal combustion engines.
  • JP-PS 49-22 989 discloses a spark plug with a central electrode which has a copper core, a nickel jacket and an ignition tip made of platinum, gold, palladium or the like, the ignition tip material having the core material is in direct contact.
  • This center electrode has been produced by extrusion molding a composite body consisting of three round blanks, the round blank provided for the ignition tip being either of almost the same diameter as the round blanks for the core and for the jacket or having a smaller diameter, so that this round blank is inserted into a through hole can be inserted in the blank.
  • the ignition section made of the noble metal is not reliably attached to the jacket and the core of this center electrode, and the spark plug does not have sufficient emergency running properties in this area if the ignition section is lost.
  • a method for producing spark plug center electrodes by extrusion is known, which is also based on a composite body which has been composed of three starting parts of different materials; the finished electrode has a jacket made of corrosion-resistant material (e.g. nickel alloy), a core encompassed by the jacket made of a material with high thermal conductivity and an ignition section made of noble metal, which is fixed in a blind hole in the bottom of the jacket on the combustion chamber side .
  • the heat-conducting electrode core is separated from the ignition section by a part of the jacket bottom and the heat flow in the electrode is consequently impeded.
  • the production of the composite body of this electrode is also relatively expensive from the point of view of mass production, because the rod-shaped output part for the core must be inserted into the deep blind hole on the connection side and the pin-shaped output part of the ignition section into the blind hole of the jacket output part on the combustion chamber side.
  • a method similar to that described in DE-OS 36 07 243 is also known from DE-OS 34 33 683: Instead of a pin-shaped ignition section output part, a disk-shaped output part is used here.
  • DE-AS 26 14 274 describes a spark plug with electrodes which have a silver core surrounded by a tubular nickel jacket and in which the silver core is exposed on the end face on the combustion chamber side.
  • Such electrodes are functional, but they have a relatively high proportion of silver, which makes these electrodes expensive.
  • the US-PS 2 296 033 shows spark plugs with center and ground electrodes, which have a structure like the electrodes of the aforementioned DE-AS 26 14 274, the combustion chamber-side end faces are additionally provided with welded-on ignition sections made of platinum or platinum alloys .
  • the manufacturing process of such electrodes by hammering and welding is very expensive; in addition, the emergency running properties of such electrodes are poor when the welded-on ignition sections are lost.
  • the invention is based on the object of developing a method for producing long-life spark plug electrodes or electrodes of this type which have a jacket made of the most corrosion-resistant material possible, have a core surrounded by the jacket made of a material with high thermal conductivity, and the core thereof is covered on its end face on the combustion chamber side by a small-volume area of a burn-off-resistant material, the burn-off-resistant area being held securely in the long term and with the stresses in modern high-performance internal combustion engines; the manufacturing process of these electrodes is said to be suitable for economical mass production.
  • a small-volume fourth section of material made of highly erosion-resistant material e.g. platinum or a Pt alloy
  • the erosion-resistant material e.g. silver or a silver alloy
  • these electrodes can also be processed further to ground electrodes.
  • FIG. 1 shows the area of a conventional spark plug 10 on the combustion chamber side:
  • the spark plug housing 11 is provided on the combustion chamber side with a screw thread 12 for the installation of the spark plug 10 in an internal combustion engine.
  • the end face of the spark plug housing 11 on the combustion chamber side is identified by reference number 13.
  • an insulating body 15 protrudes from the indicated longitudinal bore of the spark plug housing 11, which is denoted by reference number 14 and which comprises a central electrode 16 in its axial bore (not shown); the The end face 17 of the center electrode 16 on the combustion chamber side is at a distance from the free end section of a hook-shaped curved ground electrode 18.
  • the end of the ground electrode 18 opposite the free end is fastened to the end face 13 of the spark plug housing 11, e.g. B. by welding.
  • the gap between the end face 17 of the center electrode 16 and the free end section of the ground electrode 18 represents the spark gap 19 of the spark plug 10.
  • spark plugs are also known in which the spark gap is located within the housing longitudinal bore 14.
  • spark plugs of this type mostly hook-shaped, rather straight ground electrodes are used; the straight ground electrodes are also fastened to the spark plug housing 11 and can lie with their free end section on the combustion chamber side at a distance in front of the end face 17 of the center electrode 16, but they can also be aligned such that their free end face 20 radially on the end section on the combustion chamber side of the center electrode 16.
  • the end face 17 of the center electrode 16 and the free end face 20 of the ground electrode 18 face each other at a distance.
  • the position of the spark gap 19 and the design or arrangement of the ground electrode 18, and possibly also the number of ground electrodes on a spark plug, are determined by the requirements and conditions of the internal combustion engine, but are not relevant to the present invention, since the electrodes according to the invention are for everyone these spark plugs can be used advantageously.
  • Extrusion processes for producing spark plug electrodes including those composed of several material areas, are known in principle and have been described in the introduction to the description. Such extrusion processes can be used economically for the mass production of electrodes and have proven themselves well for this purpose. Due to the higher requirements for spark plugs in modern high-performance internal combustion engines and with regard to the requirement for a longer service life, spark plug electrodes are required which meet these requirements.
  • a first method for producing such a center electrode 16 for spark plugs 10 is described with reference to FIGS. 2 to 6.
  • FIG. 2 shows three output parts 31, 32 and 33 for an embodiment of a center electrode 16.
  • the output part 31 is designed as a circular blank, which consists of corrosion-resistant material (for example nickel or nickel alloy) and in the finished center electrode 16 according to FIG 6 whose jacket 31 'is to form.
  • This jacket output part 31 has a sack lock 34, which is arranged in the center of its top 35;
  • the blind hole 34 is preferably conical or truncated cone-shaped, but can also be of a different configuration and, with its smallest diameter, projects close to the underside 36 of the jacket output part 31.
  • the two output parts 31 and 32 described above are then heated in such a way that the output part 32 melts and the sack lock 34 in the jacket output part 31 completely fills.
  • the circular-shaped output part 33 of the center electrode core 33 ' which consists of a material with high thermal conductivity, is then placed on this heated arrangement; copper or a copper alloy is preferably used as the material for this core starting part 33.
  • the core output part 33 has the same diameter as the jacket output part 31 and is provided on its upper side 37 with a coaxial extension 38 for reasons of handling suitable for production; the display of radii or chamfers on the output parts 31 and 33, which can also be used for production-related handling, has been dispensed with.
  • An auxiliary device can be used for the axial alignment and connection of the output parts 31 and 33.
  • the core output part 33 is coaxially connected on its underside 39 to the two other output parts 31 and 32, the melted output part 32 serving as a solder.
  • the jacket output part 31 with the melted and cooled in the blind hole 34 output part 32 of the erosion-resistant area on the one hand and the core output part 33 on the other hand also by welding, for. B. connected by resistance welding.
  • 33 can possibly Coatings (e.g. made of silver) that facilitate the joining process are used on these parts.
  • a layer (not shown) is preferably arranged between the core output part 33 and the burn-resistant area or output part 32 made of silver or a silver alloy, which layer can avoid undesired oxidation in the contact areas and consequently poorer thermal conductivity and even spark plug defects; suitable substances for such a layer are e.g. B. nickel and platinum.
  • a layer can be produced by coating the core starting part 33 with the nickel or platinum or by additionally arranging a foil made of nickel or platinum on the underside 39 of the core starting part 33.
  • the arrangement composed and cooled of the starting parts 31, 32 and 33 results in a composite body which is identified by the reference number 40 (see FIG. 3); this composite body 40 is the starting part for the subsequent extrusion process.
  • a tool 41 for the extrusion of spark plug electrodes 16 is shown in principle in FIG.
  • This extrusion tool 41 has a die 42 which has a receiving bore 43 for the electrode output parts 31, 32, 33 or the composite body 40; this receiving bore 43 merges coaxially into a sloping shoulder 44 with a reduced diameter and then into the extrusion opening 45.
  • the extrusion opening 45 then then merges into a bore 47 via a shoulder 46 which increases in diameter.
  • the diameter of the receiving bore 43 is dimensioned such that the output parts 31 and 33 or the composite body 40 come to rest with their peripheral surfaces on the wall of the receiving bore 43; the diameter of the extrusion opening 45 of the tool 41 corresponds to the diameter of the shaft 48 of the center electrode 30 (see FIG. 6).
  • the output parts 31, 32, 33 or the composite body 40 are first correspondingly from above inserted, with the jacket output part 31 facing the extrusion opening 45, and then an extrusion die 49 is guided in a known manner; the extrusion die 49 is then pressurized and presses the output parts 31, 32, 33 or the composite body 40 partially through the extrusion opening 45; only one head section remains above the extrusion opening 45.
  • a tubular jacket 31 'made of corrosion-resistant material has formed from the output part 31, a burnout-resistant area 32, which is bounded laterally by the jacket 31 and on the combustion chamber side by a jacket bottom 54, has resulted from the output part 32 and from which Starting part 33 was formed a core 33 ', likewise encompassed laterally by the jacket 31', but free on the connection side, from a material of high thermal conductivity;
  • the bottom 54 of the jacket 31 ' is completely or only partially closed.
  • the electrode 16 has its exact length and the largest possible cross-section of the erosion-resistant region 32 'is exposed, the end section of the electrode blank 50 on the combustion chamber side is machined accordingly; the electrode end face 17 is preferably produced by grinding.
  • FIGS. 7 and 8 Another possibility for producing a composite body 60 intended for extrusion can be seen from FIGS. 7 and 8:
  • the starting part 61 for the jacket 31 'of the center electrode 16 according to FIG. 6 is assumed to be a bowl, the round circumference of which is dimensioned such that it fits snugly into the receiving bore of an extrusion tool.
  • This extrusion die essentially has the structure of the extrusion die shown in FIG. 4; the diameter of the receiving bore and the stamp are adapted to the outer diameter of the output part 61.
  • the bottom of the jacket output part 61 is designated by the reference number 63.
  • An output part 64 for the erosion-resistant area 32 ′ of the central electrode 16 according to FIG. 6 is then inserted into the blind hole 62 of the jacket output part 61; this output part 64 is preferably a circular blank with a round circumference, but can also be of another shape, for. B. spherical or rod-shaped. These two output parts 61 and 64 are preferably heated so that the output part 64 melts in the blind hole 62 of the cup-shaped output part 61.
  • a rod-shaped output part 65 for the core 33 ′ of the central electrode 16 is inserted into the free space in the blind hole 62 of the jacket output part 61, which space is not taken up by the melted output part 64;
  • the upper end face 66 of the core output part 65 is preferably flush with the ring-shaped upper side 67 of the jacket output part 61, but may also protrude somewhat beyond the mentioned upper side 67.
  • the core output part 65 can also be inserted into the blind hole 62 above the output part 64 when the output part 64 has not yet been melted.
  • the three output parts 61, 64 and 65 are heated together in such a way that the output part 64 melts for the erosion-resistant area. It is advantageous if, after the melting of the output part 64, pressure is exerted on the core output part 65 with a stamp (not shown). The rod-shaped core output part 65 is held in the jacket output part 61 by the melted output part 64 and / or also as a result of the shrinking of the diameter of the blind hole 62. Otherwise, all of the features described above also apply to these process variants.
  • a further improvement in the electrode properties, in particular an extension of the service life, can be achieved by the additional process measures described below with reference to FIGS. 9 to 12:
  • FIG. 9 as in FIG. 7, the output parts of a center electrode 70 to be pressed (see FIG. 12) are shown.
  • the jacket output part 71 arranged at the bottom corresponds to the jacket output part 31
  • the output part 72 for the erosion-resistant area corresponds to the output part 32
  • the core output part 73 corresponds to the output part 33.
  • a very first small-volume output part 75 inserted for a highly erosion-resistant area 81 of a central electrode according to FIG. 12 this output part 75 is preferably designed as a ball and preferably consists of a platinum metal, an alloy of platinum metals, but can also be composed of platinum metal with another metal.
  • the output part 72 for the erosion-resistant area 82 is then also inserted into the blind hole 74 and this arrangement is then heated until the output part 72 melts.
  • the highly erosion-resistant outlet part 75 which has a higher melting point, will be arranged at the lowest point 76 of the blind hole 74 in the jacket outlet part 71; it is advantageous if the area of the lowest point 76 in the jacket output part 71 is shaped such that the spherical surface of the output part 75 for the highly erosion-resistant area 81 lies flat.
  • the size of the output part 72 for the erosion-resistant area 82 is to be dimensioned such that it fills the blind hole 74 flush after melting.
  • the core output part 73 is then also attached to this arrangement with the aid of an auxiliary device, not shown, as in the first exemplary embodiment (see FIG. 3).
  • the resulting composite body 77 is shown in FIG. 10.
  • this composite body 77 has the appearance of the electrode blank 79 shown in FIG. 11.
  • the electrode blank 79 - like the blank according to FIG. 5 - has a jacket bottom 80 which is more or less closed on the combustion chamber side , which is then followed by the small-volume region 81 of the highly erosion-resistant material (e.g. platinum), then an area 82 of erosion-resistant material (e.g. silver) and then the core 83 (e.g. copper).
  • the highly erosion-resistant material e.g. platinum
  • the core 83 e.g. copper
  • this highly erosion-resistant area 81 is extremely small, such an electrode 70 would still have emergency running properties over many kilometers even if this area 81 were worn.
  • the jacket of this electrode is designated by the reference number 84 and the end face on the combustion chamber side by the reference number 85.
  • such a center electrode 70 which is composed of four material areas, can in principle also be produced according to FIG. 12 using the method shown in FIGS. 7 and 8.
  • FIG. 13 it is shown that the jacket output part 90 is again cup-shaped in this method, that the Core output part 91 is again designed as a rod and that the output part 92 for the erosion-resistant area 82 is again cylindrical or of another configuration (e.g. spherical).
  • the output part 93 for the highly erosion-resistant area 81 there is also an output part 93 for the highly erosion-resistant area 81; this additional output part 93 is first put into the blind hole 94 of the jacket output part 90 when the output parts are assembled.
  • the inside of the bottom 95 of the jacket starting part 90 is provided with a centrally arranged, conical recess 96 and the starting part 93 for the highly erosion-resistant area 81 is designed as a ball; due to this design of the bottom 95 of the jacket output part 90 and the output part 93, the latter can be kept particularly small.
  • the further processing of the listed starting parts 90 to 93 takes place in accordance with the method steps which have already been described for the exemplary embodiments according to FIGS. 7 and 8.
  • the composite body 97 resulting from this method is shown in FIG. 14 and is extruded and processed in the same manner as is described in the above exemplary embodiments; what has been said in the preceding exemplary embodiments about the materials used applies accordingly to this exemplary embodiment.
  • the combustion chamber-side section can the central electrodes 16, 70 are made smaller in diameter than their shafts 100, 100 ';
  • the center electrode region concerned is shown in this way using a center electrode 70 according to FIG.
  • the jacket of this center electrode 70 ' is 84', the core 83 ', the erosion-resistant area 82' and the highly erosion-resistant area designated 81 '.
  • the shaft 100 of this center electrode 70 ' has the diameter produced by the extrusion method described, while the cylindrical end section 101 on the combustion chamber side has a reduced diameter.
  • the diameter of the shaft 100 can be approximately 2.7 millimeters and the diameter of the end section 101 on the combustion chamber side can be approximately 1.2 millimeters.
  • the diameter of the highly erosion-resistant area 81 ' can be 0.8 millimeters, its thickness 0.35 millimeters.
  • the area 82 'of erosion-resistant material following the area 81' can extend in the axial direction over a length of approximately 2 to 4 millimeters.
  • the region 102 adjoining the combustion chamber-side end section 101, which is arranged in the fully assembled spark plug 10 in the combustion chamber-side end section of the insulating body 15, is provided with a diameter which is slightly smaller than the diameter of the center electrode shaft 100 ; this measure, known per se, prevents the insulating body 15 from being broken up when the warm spark plug 10 is in operation due to the thermal expansion of the central electrode 70 '.
  • FIG. 16 alternatively shows a center electrode 70 ′′, the structure of which corresponds to the center electrode 70 ′ and its transition surface 105, however, runs directly and continuously, preferably frustoconically, from the end face 103 'on the combustion chamber side to the adjoining region 102'.
  • the shaft of this electrode 70 is identified by the reference number 100 '.
  • the areas 101 and 102 or 101 'and 102' with reduced diameter are produced by known round hammering; in the case of such center electrodes 70 ', 70 ", the end faces 103, 103' on the combustion chamber side are expediently ground only after the relevant areas 101, 102 or 101 'and 102' have been hammered out.
  • FIGS. 17 and 18 show an electrode blank 110 for a ground electrode 18 or 18 'according to FIGS. 19 or 20, which was created by extruding a composite body according to one of FIGS. 3, 8, 10 or 14, then in FIG The area of the shaft 111 was additionally provided with a cross section corresponding to FIG. 18 by flat stamping. To complete the ground electrode 18 or 18 ', as shown in FIGS.
  • the head 112 and, in most spark plug types, the free end section 113 is separated from the electrode blank 110 in such a way that the Electrode 18, 18 'receives its required length and the burn-resistant area 115 (FIG. 19) or the highly burn-resistant area 116 (FIG. 20) is exposed on its end face 114, 114' on the combustion chamber side.
  • the method step "bending" is to be provided, which is to be carried out either for the individual part ground electrode 18, 18' or only when the ground electrode 18, 18 'is already on the end face 13 of the spark plug housing 11 was attached.
  • the hook-shaped curved ground electrode 18 which partially or completely protrudes the end face 17 of the center electrode 16
  • at least one area of the ground electrode facing the center electrode end face 17 can also be used 18, 18 'are freed from the jacket 117, 117' in order to expose the erosion-resistant area 115, 115 'and / or the highly erosion-resistant area 116 (not shown); the exposure of these areas 115, 115 ', 116 can e.g. B. also be done by grinding or milling.
  • the jacket of the pig electrode 18 or 18 ' is identified by 117 or 117' and the core by 118 or 118 '.
  • the electrodes according to the invention withstand the heavy loads in modern high-performance internal combustion engines and can be economically manufactured in known and proven mass production facilities.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
EP90916240A 1989-12-16 1990-11-13 Verfahren zur herstellung von elektroden für zündkerzen sowie zündkerzen-elektroden Expired - Lifetime EP0505368B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3941649 1989-12-16
DE3941649A DE3941649A1 (de) 1989-12-16 1989-12-16 Verfahren zur herstellung von elektroden fuer zuendkerzen sowie zuendkerzen-elektroden
PCT/DE1990/000864 WO1991009438A1 (de) 1989-12-16 1990-11-13 Verfahren zur herstellung von elektroden für zündkerzen sowie zündkerzen-elektroden

Publications (2)

Publication Number Publication Date
EP0505368A1 EP0505368A1 (de) 1992-09-30
EP0505368B1 true EP0505368B1 (de) 1996-02-07

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EP90916240A Expired - Lifetime EP0505368B1 (de) 1989-12-16 1990-11-13 Verfahren zur herstellung von elektroden für zündkerzen sowie zündkerzen-elektroden

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US (1) US5310373A (zh)
EP (1) EP0505368B1 (zh)
JP (1) JPH05502751A (zh)
KR (1) KR920704388A (zh)
CN (1) CN1024876C (zh)
AU (1) AU638540B2 (zh)
BR (1) BR9007920A (zh)
CZ (1) CZ285181B6 (zh)
DE (2) DE3941649A1 (zh)
ES (1) ES2083465T3 (zh)
HU (1) HUT60876A (zh)
PL (1) PL163659B1 (zh)
SK (1) SK278875B6 (zh)
WO (1) WO1991009438A1 (zh)
YU (1) YU219890A (zh)

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US6971937B2 (en) 2000-03-29 2005-12-06 Robert Bosch GmbH Method of manufacturing a spark plug for an internal combustion engine

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DE10031906B4 (de) * 2000-06-30 2006-05-24 Becromal S.P.A. Verfahren zur Herstellung von Elektroden sowie damit hergestellte Elektroden
DE10331418A1 (de) * 2003-07-10 2005-01-27 Bayerische Motoren Werke Ag Plasmastrahl-Zündkerze
DE102005052425A1 (de) * 2005-11-03 2007-05-10 Robert Bosch Gmbh Zündkerzenelektrode und Verfahren zum Herstellen einer Zündkerzenelektrode
EP1950856B1 (en) * 2006-03-14 2014-01-15 NGK Spark Plug Co., Ltd. Method for manufacturing spark plug and spark plug
CN101064414B (zh) * 2006-04-28 2010-11-03 柳孟柱 一种汽车火花塞的复合中心电极及其制备工艺
JP5279870B2 (ja) * 2011-01-27 2013-09-04 日本特殊陶業株式会社 スパークプラグ用電極の製造方法およびスパークプラグの製造方法
US9083156B2 (en) 2013-02-15 2015-07-14 Federal-Mogul Ignition Company Electrode core material for spark plugs
DE102013109612A1 (de) * 2013-09-03 2014-09-25 Federal-Mogul Ignition Gmbh Zündkerze
JP5815649B2 (ja) * 2013-11-20 2015-11-17 日本特殊陶業株式会社 スパークプラグ
JP6017027B2 (ja) * 2013-12-20 2016-10-26 日本特殊陶業株式会社 スパークプラグ
DE102016108592B4 (de) * 2016-05-10 2018-06-28 Borgwarner Ludwigsburg Gmbh Glühkerze und Verfahren zum Herstellen einer Glühkerze
DE102016224502A1 (de) * 2016-12-08 2018-06-14 Robert Bosch Gmbh Zündkerzenelektrode, Zündkerze und Verfahren zur Herstellung einer Zündkerzenelektrode
WO2020223413A1 (en) 2019-04-30 2020-11-05 Federal-Mogul Ignition Llc Spark plug electrode and method of manufacturing same

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CA1268020A (en) * 1985-01-14 1990-04-24 Ronnie W. Clark Method for producing a composite center electrode for spark plug
US4684352A (en) * 1985-03-11 1987-08-04 Champion Spark Plug Company Method for producing a composite spark plug center electrode
JP2822450B2 (ja) * 1989-05-25 1998-11-11 株式会社デンソー スパークプラグ用電極の製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6971937B2 (en) 2000-03-29 2005-12-06 Robert Bosch GmbH Method of manufacturing a spark plug for an internal combustion engine

Also Published As

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US5310373A (en) 1994-05-10
DE59010125D1 (de) 1996-03-21
PL163659B1 (pl) 1994-04-29
EP0505368A1 (de) 1992-09-30
PL288226A1 (en) 1991-12-02
WO1991009438A1 (de) 1991-06-27
AU638540B2 (en) 1993-07-01
KR920704388A (ko) 1992-12-19
JPH05502751A (ja) 1993-05-13
YU219890A (sh) 1994-01-20
CN1052577A (zh) 1991-06-26
CS9006165A2 (en) 1991-08-13
CN1024876C (zh) 1994-06-01
ES2083465T3 (es) 1996-04-16
HU9201991D0 (en) 1992-09-28
BR9007920A (pt) 1992-10-06
AU7043091A (en) 1991-07-18
HUT60876A (en) 1992-10-28
DE3941649A1 (de) 1991-06-20
SK278875B6 (sk) 1998-04-08
CZ285181B6 (cs) 1999-06-16

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