EP1094575B1 - Bougie d'allumage - Google Patents

Bougie d'allumage Download PDF

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Publication number
EP1094575B1
EP1094575B1 EP00122635A EP00122635A EP1094575B1 EP 1094575 B1 EP1094575 B1 EP 1094575B1 EP 00122635 A EP00122635 A EP 00122635A EP 00122635 A EP00122635 A EP 00122635A EP 1094575 B1 EP1094575 B1 EP 1094575B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
central electrode
region
bore
diameter
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
EP00122635A
Other languages
German (de)
English (en)
Other versions
EP1094575A1 (fr
Inventor
Manfred Adolf
Werner Niessner
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.)
BorgWarner Ludwigsburg GmbH
Original Assignee
Beru AG
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 Beru AG filed Critical Beru AG
Publication of EP1094575A1 publication Critical patent/EP1094575A1/fr
Application granted granted Critical
Publication of EP1094575B1 publication Critical patent/EP1094575B1/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
    • H01T13/02—Details
    • H01T13/14—Means for self-cleaning
    • 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 invention relates to a spark plug.
  • a spark plug is included an electrically insulating ceramic insulator, a metallic one Spark plug body, a ground electrode and one Center electrode, which is centered in a bore of the ceramic insulator is arranged, described in the ignition side End area on the circumference of the center electrode a circumferential Tip is formed or formed, the center electrode comprises annular; this circumferential tip is in Area of the spark outlet area near the ground potential arranged and serves one at the tips Establish field concentration to do the spark work to reduce; however, this training has no influence on the emergence or burnup of electrically conductive Combustion residues in the gap between the insulator and the center electrode.
  • Figure 1 gives an embodiment a spark plug according to the invention schematically and in partial longitudinal section again;
  • Figure 2 is a partial cross section through the combustion chamber Area of the insulator base of the spark plug version according to FIG. 1.
  • the embodiment of the spark plug according to the invention 1 has an electrically insulating ceramic insulator 1, a metallic spark plug body 2, a ground electrode 3 and a center electrode 4, which is centric is arranged in a bore 5 of the ceramic insulator 1.
  • the center electrode 4 is electrically conductive Sealing compound 6, preferably a glass melt in the Insulator hole 5 fixed.
  • the Center electrode 4 has a jacket made of a nickel alloy 7 with a core 8 made of a good heat-conducting material, preferably Copper, on.
  • the insulator bore 5 has a ring-shaped tip 10 the center electrode 4, the circumferential tip 10 is in present case formed burr-shaped and has one Slope ⁇ from about 15 to about 90 degrees; she is on the Sheath 7 of the center electrode 4 molded on or from this formed.
  • combustion chamber side Area of the center electrode 4 is tapered
  • this area is not tapered, but the surrounding area of the Insulator bore 5 has a larger diameter than the connection side Has bore area.
  • the center electrode 4 with a noble metal reinforcement is preferred 9 provided; it essentially has one corresponding to the diameter of the center electrode tip Diameter from about 0.5 mm to about 1.5 mm and exists preferably made of a platinum alloy or an iridium alloy.
  • the gap S between Insulator foot 11 and bore diameter of the breathing space 12 of the spark plug body 2 has a width that is at least 1.5 times the ignition gap Z between the ground electrode 3 and center electrode 4 corresponds.
  • the center electrode 4 is geometrical designed and defined in this way in the insulator bore 5 placed that on the spark plug in extreme cold start operation or when operating the engine with an oxygen / fuel ratio ⁇ ⁇ 1.0 no shunt on the insulation gap of the insulator foot between the center electrode 4 and the spark plug body 2, which is ⁇ 100 MOhm.
  • Center electrode 4 with around the circumference of the center electrode jacket 7 trending sharp tip 10 becomes local Field peak increase caused, in connection with the sooty insulator foot creates a strong inhomogeneous field, which in turn is a prerequisite for the training of Partial discharges, so-called corona discharges. While engine operation occurs before the electrical breakthrough on the spark gap between the center electrode 4 and the Ground electrode 3 targeted pre-discharges between the sharp ones Tip 10 on the center electrode and the insulator hole 5th
  • a corona discharge is a Gap between the sharp tip 10 of the center electrode 4 and the insulator bore 5 of at least about 0.15 mm. Due to the constructively initiated pre-discharge it leads to a stable glow discharge.
  • the glow discharge growing discharge channels with tufted, bluish discharge pattern clean the insulator bore 5 and interrupt the electrical conductor strip of the soot particles coated insulator base 11 to the ground potential of the spark plug body Second
  • the spark plugs of the invention have excellent Cold start and high resistance to Soot with the resulting malfunctions on.
  • the high shunt resistance of the combustion chamber Current conduction path prevents parasitic discharge through the Insulator foot and leads to the best possible ignition of the Fuel / air mixture.

Landscapes

  • Spark Plugs (AREA)

Claims (10)

  1. Bougie d'allumage avec un isolateur en céramique assurant une isolation électrique (1), un corps métallique de bougie d'allumage (2), une électrode de masse (3) et une électrode centrale (4), qui est disposée au centre dans une forure (5) de l'isolateur en céramique (1), caractérisée en ce qu'une pointe circulaire (10), qui entoure l'électrode centrale (4) dans le sens circulaire et qui est disposée à l'intérieur de la zone d'extrémité située du côté de la chambre de combustion de la forure de l'isolateur (5), est aménagée ou formée autour de la zone d'extrémité sur le côté de l'allumage sur le pourtour de l'électrode centrale (4).
  2. Bougie d'allumage selon la revendication 1, caractérisée en ce que la pointe circulaire (10) présente une pente α de 15 à 90°.
  3. Bougie d'allumage selon la revendication 1 ou 2, caractérisée en ce que la pointe (10) est réalisée dans le matériau de l'enveloppe (7) de l'électrode centrale (4).
  4. Bougie d'allumage selon l'une des revendications précédentes, caractérisée en ce que la zone de l'électrode centrale (4) située du côté de l'allumage, autour de laquelle est disposée la pointe (10), est rétrécie par rapport à la zone de l'électrode centrale (4) s'étendant du côté de la connexion.
  5. Bougie d'allumage selon la revendication 4, caractérisée en ce que le rapport entre le diamètre D1 de la forure de l'isolateur (5), le diamètre D2 de la zone rétrécie de l'électrode centrale plus la pointe circulaire (10), le diamètre D3 de la zone rétrécie de l'électrode centrale et le diamètre D5 de la zone non rétrécie de l'électrode centrale remplit les conditions suivantes : D2 = D1 - (0,3 à 1,0) mm ; D3 = D1 - (0,5 à 1,5) mm ; D5 = D1 - (0,05 à 0,1) mm.
  6. Bougie d'allumage selon la revendication 1 à 3, caractérisée en ce que le diamètre de la forure (5) dans la zone de l'électrode centrale (4) située du côté de la connexion, autour de laquelle est disposée la pointe (10), est agrandi par rapport à la zone de la forure située du côté de la connexion.
  7. Bougie d'allumage selon l'une des revendications 1 à 5, caractérisée en ce que la zone rétrécie de l'électrode centrale (4) située du côté de l'allumage est entourée pour l'essentiel par la forure (5), la pointe (10) de la zone rétrécie de l'électrode centrale (4) s'étendant dans le sens circulaire et étant disposée à environ 1/2 de A au centre de la cote de dépassement A du pied de l'isolateur (11) et du corps de la bougie d'allumage.
  8. Bougie d'allumage selon l'une des revendications précédentes, caractérisée en ce que l'électrode centrale (4) est réalisée sur la totalité de la surface de la pointe d'allumage avec une armature en métal précieux (9) d'un diamètre de 0,5 mm à 1,5 mm.
  9. Bougie d'allumage selon la revendication 8, caractérisée en ce que l'alliage en métal précieux est un alliage de platine ou un alliage d'iridium.
  10. Bougie d'allumage selon l'une des revendications précédentes, caractérisée en ce que la fente S prévue entre le pied de l'isolateur (11) et le diamètre de la forure de la cavité d'évent (12) du corps de la bougie d'allumage (2) a une largeur, qui correspond au moins à 1,5 fois l'écartement d'allumage Z entre l'électrode de masse (3) et l'électrode centrale (4).
EP00122635A 1999-10-21 2000-10-17 Bougie d'allumage Expired - Lifetime EP1094575B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19950922A DE19950922A1 (de) 1999-10-21 1999-10-21 Zündkerze
DE19950922 1999-10-21

Publications (2)

Publication Number Publication Date
EP1094575A1 EP1094575A1 (fr) 2001-04-25
EP1094575B1 true EP1094575B1 (fr) 2003-01-15

Family

ID=7926531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00122635A Expired - Lifetime EP1094575B1 (fr) 1999-10-21 2000-10-17 Bougie d'allumage

Country Status (6)

Country Link
US (1) US6583538B1 (fr)
EP (1) EP1094575B1 (fr)
JP (1) JP4837819B2 (fr)
AT (1) ATE231297T1 (fr)
DE (2) DE19950922A1 (fr)
ES (1) ES2187419T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009004257A (ja) * 2007-06-22 2009-01-08 Nippon Soken Inc スパークプラグ取付構造
JP4719191B2 (ja) * 2007-07-17 2011-07-06 日本特殊陶業株式会社 内燃機関用スパークプラグ
JP4965471B2 (ja) * 2008-01-23 2012-07-04 日本特殊陶業株式会社 スパークプラグ
US9728429B2 (en) 2010-07-27 2017-08-08 Lam Research Corporation Parasitic plasma prevention in plasma processing chambers

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1323932A (en) * 1919-12-02 Spark-plug
US1332904A (en) * 1920-03-09 Spaek-plxjg
US1216139A (en) * 1915-07-21 1917-02-13 Mccormick Mfg Company Spark-plug for internal-combustion engines.
US1192602A (en) * 1915-10-04 1916-07-25 Charles H Bond Spark-plug.
GB113774A (en) * 1917-12-13 1918-03-07 Harry James Berry Improvements in and relating to Spark Plugs.
US1332704A (en) * 1918-01-17 1920-03-02 Walter W Carson Spark-plug
US1350319A (en) * 1919-09-27 1920-08-24 A L Mccormick Spark-plug
US1497985A (en) * 1920-09-29 1924-06-17 Harry A Rasmussen Spark plug
FR572446A (fr) * 1923-10-30 1924-06-05 Bougie d'allumage
CH192902A (de) * 1936-02-03 1937-09-15 Schlatter Rudolf Zündkerze.
JPS4967037A (fr) * 1972-11-04 1974-06-28
US3883762A (en) * 1974-06-17 1975-05-13 Bendix Corp Electrical discharge device comprising an insulator body having an electrically semi-conducting coating formed thereon
JPS58216378A (ja) * 1982-06-11 1983-12-16 トヨタ自動車株式会社 スパ−クプラグ
JP2805781B2 (ja) * 1988-12-29 1998-09-30 株式会社デンソー 内燃機関用スパークプラグ
JP2789749B2 (ja) * 1989-12-26 1998-08-20 株式会社デンソー 内燃機関用スパークプラグ
JP3079383B2 (ja) * 1990-09-29 2000-08-21 日本特殊陶業株式会社 内燃機関用スパークプラグ
JPH04206488A (ja) * 1990-11-30 1992-07-28 Ryohei Kashiwabara 点火栓用の速燃焼装置
JPH04249877A (ja) * 1990-12-28 1992-09-04 Ngk Spark Plug Co Ltd スパークプラグ
US5569971A (en) * 1994-03-31 1996-10-29 Clifford; Gerald R. Readily assembled spark electrode
JPH09219274A (ja) * 1995-12-06 1997-08-19 Denso Corp スパークプラグ
DE69702476T3 (de) * 1996-04-25 2006-08-03 NGK Spark Plug Co., Ltd., Nagoya Zündkerze für einen Verbrennungsmotor

Also Published As

Publication number Publication date
JP2001155838A (ja) 2001-06-08
DE19950922A1 (de) 2001-04-26
ES2187419T3 (es) 2003-06-16
ATE231297T1 (de) 2003-02-15
JP4837819B2 (ja) 2011-12-14
US6583538B1 (en) 2003-06-24
EP1094575A1 (fr) 2001-04-25
DE50001081D1 (de) 2003-02-20

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