EP3235079B1 - Bougies d'allumage à electrode centrale - Google Patents

Bougies d'allumage à electrode centrale Download PDF

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Publication number
EP3235079B1
EP3235079B1 EP15804147.5A EP15804147A EP3235079B1 EP 3235079 B1 EP3235079 B1 EP 3235079B1 EP 15804147 A EP15804147 A EP 15804147A EP 3235079 B1 EP3235079 B1 EP 3235079B1
Authority
EP
European Patent Office
Prior art keywords
electrode
main body
region
core
spark plug
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.)
Active
Application number
EP15804147.5A
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German (de)
English (en)
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EP3235079A1 (fr
Inventor
Manfred Roeckelein
Andreas Benz
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
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Robert Bosch GmbH
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Publication of EP3235079A1 publication Critical patent/EP3235079A1/fr
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Publication of EP3235079B1 publication Critical patent/EP3235079B1/fr
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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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/39—Selection of materials for electrodes
    • 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
    • H01T13/16—Means for dissipating heat
    • 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
    • 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
    • H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode

Definitions

  • the invention is based on a spark plug according to the preamble of the independent claim.
  • the DE 10 2004 044 152 A1 discloses a spark plug according to the preamble of claim 1.
  • the insulator is the more sensitive component in the spark plug in terms of mechanical and electrical loads than the metallic components.
  • the object of the present invention is to provide a spark plug which can meet the requirements mentioned at the beginning.
  • the electrode base body has three areas, of which a third area has a constant diameter that corresponds to a diameter of a second area at the transition to the third area, it is achieved according to the invention that a spark plug with this central electrode meets the above-mentioned requirements.
  • the insulator can be made with a sufficient wall thickness, so that the spark plug can withstand the thermal, mechanical and electrical loads during operation.
  • the center electrode or the electrode base body have areas of different diameters.
  • the stated limits for the diameter of the electrode main body relate in each case to the largest diameter of the electrode main body, neglecting the electrode head.
  • the electrode head is formed on the end of the center electrode facing away from the combustion chamber. In the case of the spark plug, the electrode head rests on a seat formed on the inside of the insulator. The electrode head extends from the seat formed on the inside of the insulator to the end of the center electrode facing away from the combustion chamber. If the geometry of the cross section of the electrode base body deviates from the round shape, then the diameter relates to the circumference of the non-round geometry of the cross section of the electrode base body.
  • the diameter of the electrode base body is not greater than 1.5 mm.
  • the diameter of the electrode base body is not smaller than 1 mm so that the stability of the center electrode itself is not endangered.
  • the electrode base body should preferably have this minimum diameter so that the cross-section of the electrode base body is large enough for sufficient heat dissipation along the center electrode, so that the insulator at its end on the combustion chamber side does not additionally burden the heat absorbed from the combustion chamber with the heat absorbed by the central electrode becomes.
  • the heat absorbed by the combustion chamber is conducted within the center electrode to areas further away from the combustion chamber and therefore cooler.
  • the housing and the center electrode are at different electrical potentials.
  • the center electrode and the housing have their smallest distance from one another due to the design. This makes this area of the insulator very susceptible to electrical breakdowns.
  • the insulator it has been found to be advantageous for the insulator to have a wall thickness of not less than 2 mm in the area of the seat formed on its inside. Additionally or alternatively, it can be provided that the area of the insulator surrounding the electrode head has a wall thickness of not less than 2 mm. It is thereby achieved that the insulator has a sufficiently large wall thickness to withstand the high electrical fields occurring in the area of the seat formed on the insulator and the electrical breakdowns caused thereby.
  • the core of the electrode base body consists of a material which has a higher thermal conductivity than the material of the electrode base body. This promotes heat conduction within the basic electrode body.
  • the material of the core preferably has a thermal conductivity of at least 350 W / mK at room temperature. Additionally or alternatively, it can be provided that at room temperature the thermal conductivity of the material of the core is at least 300 W / mK greater than the thermal conductivity of the material of the electrode base body.
  • the electrode base body has, for example, an alloy containing nickel.
  • the alloy preferably contains at least 20% by weight of chromium, in particular at least 25% by weight of chromium.
  • this alternatively or additionally contains yttrium.
  • the core consists for example of copper or silver or an alloy with copper and / or silver. Investigations by the applicant have shown that, for example, a copper-containing core in the electrode base body reduces the temperature at the end of the electrode base body facing the combustion chamber by 50-80K.
  • the cross-sectional area of the core is not less than 20% of the cross-sectional area of the electrode base body or the center electrode in at least one first area, with at least one first area Area of the electrode base body and the core each have a constant diameter.
  • the cross-sectional area of the electrode base body is composed of the cross-sectional area of the core and the cross-sectional area of the jacket.
  • the at least one first area is preferably cylindrical.
  • the at least one first area preferably has a length along the longitudinal axis of the center electrode that is equal to or longer than the diameter of the electrode base body in this first area, in particular the length of the at least one first area is at least 1.5 times as long as Diameter of the electrode body.
  • the cross-sectional area of the core corresponds to a maximum of 65% of the total cross-sectional area of the electrode base body or the center electrode. This ensures that the center electrode has a sufficiently large jacket thickness.
  • the electrode base body is advantageously made of a more wear-resistant material than the core, so that the electrode base body preferably has to have a minimum jacket thickness so that the center electrode has a sufficiently long service life, for example at least 50,000 km.
  • the electrode base body has a minimum jacket thickness of not less than 0.15 mm, in particular not less than 0.25 mm. Additionally or alternatively, it can be provided that the jacket thickness in the at least one first region with constant diameters of the core and the electrode base body is not greater than 0.35 mm.
  • the center electrode has an ignition surface containing noble metal on its end surface on the combustion chamber side, which ignition surface has a higher wear resistance than the material of the electrode base body.
  • the distance b from the ignition surface to the core has a value in the range from 0.2 mm to 2 mm.
  • the center electrode has no ignition surface.
  • the distance b from the end face of the electrode base body on the combustion chamber side to the end of the core on the combustion chamber side is at least 0.6 mm long in order to ensure a sufficiently long service life of the center electrode.
  • the distance b preferably has a value which is not smaller than 1 mm, and in particular is not larger than 3.5 mm.
  • the cross-sectional area of the core and the cross-sectional area of the electrode base body have the same geometric shape, in particular the core being arranged within a cross-sectional plane in the center of the electrode base body. This ensures that the electrode base body has a uniform jacket thickness within the cross-sectional plane.
  • Spark plugs with a reduced outer diameter of the housing are, in the context of this application, spark plugs whose threads have an outer diameter smaller than 14 mm, for example so-called M12 or M10 spark plugs.
  • FIG. 1 shows schematic representations of the center electrode 10.
  • the center electrode 10 has an electrode base body 11 and a core 12, which is arranged within the electrode base body 12.
  • the core 11 consists of a material with a higher thermal conductivity than the material of the electrode base body 11.
  • the material of the electrode base body 11 has a higher wear resistance than the material of the core 12.
  • the core 12 consists of copper, silver or an alloy with copper and / or silver.
  • a Ni alloy is preferably used as the material for the electrode base body 11, and the alloy can contain chromium and / or yttrium.
  • the core of the center electrode 10 shown here in section has at least one first section 15a in which the core 12 has a relatively constant diameter d K.
  • the term “relatively constant” means that the diameter d K in the section changes its value by a maximum of 5%.
  • the diameter d K of the core 12 is reduced within a second section 14a.
  • the at least one first section 15a is arranged on a side of the center electrode 10 facing away from the combustion chamber, with an electrode head 4 (not shown here) following the end of the first facing away from the combustion chamber Section 15 is formed.
  • the second section 14a adjoins the at least one first section 15a.
  • the core 12 has a plurality of first sections 15a with constant diameters d K , the diameters d K of the individual first sections 15a being different. This is particularly the case when the center electrode 10 or the electrode base body 11 itself has a plurality of regions with different diameters d E.
  • the section closest to the combustion chamber is the second section 14a with the continuously decreasing diameter d K of the core 12.
  • the center electrode 10 shown is constructed from an electrode base body 11 which has a constant diameter d E along its length and thus the center electrode 10 also has a constant diameter d E.
  • the electrode base body 11 In the case of the electrode base body 11, at least three areas 13, 14, 15 can be distinguished. In a first region 15, the electrode base body 11 has a core 12 with a constant diameter d K. In a second region 14a, the electrode base body 11 has a core 12 with a continuously reducing diameter d K. In a third region 13, the electrode base body 11 does not have a core.
  • the thickness c of the jacket of the electrode base body 11 results from half the difference between the electrode base body diameter d E and the core diameter d K. If the electrode base body 11 has a constant diameter d E1 in the first region 15, then the jacket thickness c in this first region 15 is constant. It is advantageously provided that in this first region 15 the jacket thickness c of the electrode base body 11 is not less than 0.15 mm and not greater than 0.35 mm, for example the jacket thickness c is 0.25 mm or less.
  • the electrode base body 11 can have a constant diameter d E2 , in which case the jacket thickness c increases within the region 14 in the direction of the combustion chamber.
  • the jacket thickness c is at least 0.15 mm thick in the region 14.
  • the diameter d E2 of the electrode base body 11 is also reduced in the second region 14.
  • the jacket thickness c it is preferably in the range from 0.15 mm to 0.35 mm. It can be provided that the diameter d E2 of the electrode base body 11 changes at the same rate as the diameter d K of the core 12. This has the advantage that the jacket thickness c remains constant in the second region 14.
  • the jacket thickness c corresponds to half the diameter d E3 of the electrode base body 11.
  • the third area 13 has a constant diameter d E3 , which corresponds to the diameter d E2 of the second area 14 at the transition to third area 13 corresponds.
  • the third region 13 of the electrode base body 11 has a length b which extends from an end 17 of the core 12 on the combustion chamber side to an end face 16 of the electrode base body 11 on the combustion chamber side.
  • the length b is not greater than 3.5 mm. If the center electrode 10 is designed with a noble metal-containing ignition surface 19, the length b can be made shorter than without a noble metal-containing ignition surface 19, as in FIG Figure 1b shown. If a noble metal-containing ignition surface 19 is dispensed with, as in Figure 1a shown, then the length b should have a minimum length of 0.6 mm so that the noble metal base body 12 has enough material for a sufficiently long service life of the center electrode 10. When using a noble metal-containing ignition surface 19, a length b of at least 0.2 mm is sufficient for a sufficiently long service life of the center electrode 10.
  • Figure 2 shows an example of a cross section of the center electrode 10.
  • the diameter d E of the center electrode 10 and the electrode base body 11 is less than 1.7 mm.
  • the cross section of the core 12 is arranged centrally in the cross section of the center electrode 10 or of the electrode base body 11.
  • the thickness c of the jacket of the electrode base body 11 results from half the difference between the electrode base body diameter d E and the core diameter d K.
  • the cross-sections of the electrode base body 11 and of the core 12 advantageously have the same geometric shape.
  • FIG. 3 shows a schematic representation of a spark plug 1 with a central electrode 10 according to the invention.
  • the spark plug 1 has a metallic housing 2 with a thread for mounting the spark plug 1 in a cylinder head. Furthermore, the housing has a hexagon section 9, on which a tool for mounting the spark plug 1 in the cylinder head is attached.
  • An insulator 3 is arranged inside the housing 2.
  • a center electrode 10 and a connecting bolt 7 are arranged inside the insulator 3 and are electrically connected via a resistance element 6.
  • the insulator (3) On the inside of the insulator 3 there is a seat (3a) on which the center electrode (10) rests with its center electrode head (4).
  • the insulator (3) has a wall thickness of not less than 2 mm in the area of the seat (3a).
  • the center electrode 10 typically protrudes from the insulator 3 at the end of the spark plug 1 on the combustion chamber side.
  • the center electrode has a base body 10 and an ignition surface 19 arranged on the end of the base body on the combustion chamber side.
  • the base body 10 has a core 12 which is surrounded by a jacket 11.
  • a ground electrode 5 is arranged at the end of the housing 2 on the combustion chamber side. Which forms an ignition gap together with the center electrode 10.
  • the ground electrode 5 can be designed as a roof electrode, side electrode or bracket electrode.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (9)

  1. Bougie d'allumage (1), présentant un culot (2), un isolateur (3) disposé dans le culot (2), une électrode centrale (10) disposée dans l'isolateur (3), et une électrode de masse (5) disposée sur le culot (2), l'électrode de masse (5) et l'électrode centrale (10) étant disposées l'une par rapport à l'autre de telle sorte que l'électrode de masse (5) et l'électrode centrale (10) constituent une fente d'allumage, et dans laquelle l'électrode centrale (10) repose avec une tête d'électrode (4) sur un siège (3a) réalisé sur une face intérieure de l'isolateur (3), et l'électrode centrale (10) présentant un corps de base d'électrode (11) et un noyau (12) disposé dans le corps de base d'électrode (11), dans laquelle le noyau (12) est composé d'un matériau qui présente une conductivité thermique supérieure au matériau du corps de base d'électrode (11), le corps de base d'électrode (11) ayant un diamètre (dE) non supérieur à 1,7 mm, dans laquelle le corps de base d'électrode (11) présente une première partie (15), une deuxième partie (14) côté chambre de combustion de celui-ci, et une troisième partie (13) encore une fois côté chambre de combustion de celui-ci, dans laquelle le corps de base d'électrode (11) présente dans la première partie (15) un diamètre constant (dE1) et le noyau (12) présente un diamètre constant (dK), le corps de base d'électrode (11) présentant dans la deuxième partie (14a) un noyau (12) d'un diamètre (dK) diminuant en continu, et le corps de base d'électrode (11) ne présentant aucun noyau dans la troisième partie (13), le diamètre (dE2) du corps de base d'électrode (11) diminuant également dans la deuxième partie (14), caractérisée en ce que le corps de base d'électrode (11) présente dans la troisième partie (13) un diamètre constant (dE3) qui correspond au diamètre (dE2) du corps de base d'électrode (11) dans la deuxième partie (14) à la transition vers la troisième partie (13).
  2. Bougie d'allumage (1) selon la revendication 1, caractérisée en ce que l'isolateur (3) présente une épaisseur de paroi d'au moins 2 mm dans la partie du siège (3a) réalisé sur la face intérieure de celui-ci.
  3. Bougie d'allumage (1) selon l'une des revendications 1 ou 2, caractérisée en ce que la superficie de la section du noyau (12) dans ladite au moins une première partie (15) correspond à au moins 20 % de la superficie de la section totale de l'électrode (10).
  4. Bougie d'allumage (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la superficie de la section du noyau (12) dans ladite au moins une première partie (15) correspond au maximum à 65 % de la superficie de la section totale de l'électrode (10).
  5. Bougie d'allumage (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le corps de base d'électrode (11) présente une épaisseur de gaine c d'au moins 0,15 mm, et en particulier d'un maximum de 0,35 mm, en particulier dans ladite au moins une première partie (15).
  6. Bougie d'allumage (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'à une extrémité (16) côté chambre de combustion du corps de base d'électrode (11), la distance b entre l'extrémité (16) du corps de base d'électrode (11) et une extrémité (17) tournée vers la chambre de combustion du noyau (12) n'est pas supérieure à 3,5 mm, et en particulier n'est pas inférieure à 0,2 mm.
  7. Bougie d'allumage (1) selon l'une quelconque des revendications 1 à 6, caractérisée en ce que ladite au moins une première partie (15) est plus longue que le diamètre du corps de base d'électrode (11).
  8. Bougie d'allumage (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la superficie de la section du noyau (12) et la superficie de la section du corps de base d'électrode (11) présentent la même forme.
  9. Bougie d'allumage (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le corps de base d'électrode (11) présente un alliage contenant du nickel, en particulier en ce que l'alliage présente au moins 20 % en poids de chrome.
EP15804147.5A 2014-12-16 2015-12-03 Bougies d'allumage à electrode centrale Active EP3235079B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014226107.4A DE102014226107A1 (de) 2014-12-16 2014-12-16 Zündkerzen mit Mittelelektrode
PCT/EP2015/078538 WO2016096462A1 (fr) 2014-12-16 2015-12-03 Bougies d'allumage à electrode centrale

Publications (2)

Publication Number Publication Date
EP3235079A1 EP3235079A1 (fr) 2017-10-25
EP3235079B1 true EP3235079B1 (fr) 2021-02-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15804147.5A Active EP3235079B1 (fr) 2014-12-16 2015-12-03 Bougies d'allumage à electrode centrale

Country Status (8)

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US (1) US10250015B2 (fr)
EP (1) EP3235079B1 (fr)
JP (1) JP6753852B2 (fr)
KR (1) KR20170094230A (fr)
CN (1) CN107005029A (fr)
DE (1) DE102014226107A1 (fr)
ES (1) ES2865177T3 (fr)
WO (1) WO2016096462A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014226107A1 (de) 2014-12-16 2016-06-16 Robert Bosch Gmbh Zündkerzen mit Mittelelektrode

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US6528929B1 (en) * 1998-11-11 2003-03-04 Ngk Spark Plug Co., Ltd. Spark plug with iridium-based alloy chip
DE102004044152A1 (de) * 2003-09-11 2005-04-07 NGK Spark Plug Co., Ltd., Nagoya Zündkerze
JP2005108821A (ja) * 2003-09-11 2005-04-21 Ngk Spark Plug Co Ltd スパークプラグ
JP2005327743A (ja) * 1997-04-23 2005-11-24 Ngk Spark Plug Co Ltd 抵抗体入りスパークプラグ、スパークプラグ用抵抗体組成物及び抵抗体入りスパークプラグの製造方法
US20090127998A1 (en) * 2007-11-21 2009-05-21 Ngk Spark Plug Co., Ltd. Spark plug

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BE788263A (fr) * 1971-08-02 1973-02-28 Int Nickel Ltd Alliages a base de nickel renforces par dispersion, leur preparation etleur utilisation
JPH0343982A (ja) * 1989-07-07 1991-02-25 Nippondenso Co Ltd 点火プラグの中心電極の製造方法
JPH0737672A (ja) 1993-07-22 1995-02-07 Ngk Spark Plug Co Ltd 内燃機関用スパークプラグ
JP2006269441A (ja) 1998-11-11 2006-10-05 Ngk Spark Plug Co Ltd スパークプラグ
JP4159211B2 (ja) 1998-11-11 2008-10-01 日本特殊陶業株式会社 スパークプラグ
DE19854861A1 (de) 1998-11-27 2000-05-31 Beru Ag Zündkerze
JP3795374B2 (ja) * 2001-10-31 2006-07-12 日本特殊陶業株式会社 スパークプラグ
US7599002B2 (en) 2003-12-02 2009-10-06 Logitech Europe S.A. Network camera mounting system
JP2005203119A (ja) 2004-01-13 2005-07-28 Ngk Spark Plug Co Ltd スパークプラグ
WO2007105695A1 (fr) * 2006-03-14 2007-09-20 Ngk Spark Plug Co., Ltd. Procede de fabrication de bougie d'allumage et bougie d'allumage
JP2010165698A (ja) * 2010-05-07 2010-07-29 Ngk Spark Plug Co Ltd スパークプラグ
JP5036894B1 (ja) 2011-06-17 2012-09-26 日本特殊陶業株式会社 スパークプラグ
JP5599840B2 (ja) 2012-04-27 2014-10-01 日本特殊陶業株式会社 スパークプラグ、スパークプラグの製造方法
JP2014038773A (ja) 2012-08-17 2014-02-27 Ngk Spark Plug Co Ltd スパークプラグ
US9083156B2 (en) 2013-02-15 2015-07-14 Federal-Mogul Ignition Company Electrode core material for spark plugs
DE102014226107A1 (de) 2014-12-16 2016-06-16 Robert Bosch Gmbh Zündkerzen mit Mittelelektrode

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005327743A (ja) * 1997-04-23 2005-11-24 Ngk Spark Plug Co Ltd 抵抗体入りスパークプラグ、スパークプラグ用抵抗体組成物及び抵抗体入りスパークプラグの製造方法
US6528929B1 (en) * 1998-11-11 2003-03-04 Ngk Spark Plug Co., Ltd. Spark plug with iridium-based alloy chip
DE102004044152A1 (de) * 2003-09-11 2005-04-07 NGK Spark Plug Co., Ltd., Nagoya Zündkerze
JP2005108821A (ja) * 2003-09-11 2005-04-21 Ngk Spark Plug Co Ltd スパークプラグ
US20090127998A1 (en) * 2007-11-21 2009-05-21 Ngk Spark Plug Co., Ltd. Spark plug

Also Published As

Publication number Publication date
US10250015B2 (en) 2019-04-02
EP3235079A1 (fr) 2017-10-25
JP2017538270A (ja) 2017-12-21
ES2865177T3 (es) 2021-10-15
CN107005029A (zh) 2017-08-01
US20170346260A1 (en) 2017-11-30
JP6753852B2 (ja) 2020-09-09
DE102014226107A1 (de) 2016-06-16
KR20170094230A (ko) 2017-08-17
WO2016096462A1 (fr) 2016-06-23

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