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WO2015090723A1 - Bougie d'allumage dotée d'un joint en matière non conductrice - Google Patents

Bougie d'allumage dotée d'un joint en matière non conductrice Download PDF

Info

Publication number
WO2015090723A1
WO2015090723A1 PCT/EP2014/074022 EP2014074022W WO2015090723A1 WO 2015090723 A1 WO2015090723 A1 WO 2015090723A1 EP 2014074022 W EP2014074022 W EP 2014074022W WO 2015090723 A1 WO2015090723 A1 WO 2015090723A1
Authority
WO
WIPO (PCT)
Prior art keywords
spark plug
seal
conductive material
housing
insulator
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.)
Ceased
Application number
PCT/EP2014/074022
Other languages
German (de)
English (en)
Inventor
Detlef Hartmann
Heribert Duetsch
Arnold Schneider
Klaus BUNDSCHUH
Jorge Diaz Alfonso
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 WO2015090723A1 publication Critical patent/WO2015090723A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement

Definitions

  • the invention relates to a spark plug, in particular for an internal combustion engine, comprising a housing, an insulator arranged in the housing, an insulator arranged in the insulator
  • seals are used at different points of the spark plug, so that the built-in engine block or spark plug in the shaft plug is gas-tight compared to the gases in the combustion chamber.
  • inner seal also called inner seal or inner seal, which seals the transition between the housing and insulator.
  • Inner gaskets have hitherto been used for metal gaskets, e.g. made of steel or copper, used for spark plugs.
  • the metallic inner seal is at the same electrical potential as the housing and thus reduces the effective distance between located at different electrical potential levels housing and center electrode.
  • the metallic inner seals have production-related edges, which can lead to local increases in the electric field. The field increase extends into the insulator and reduces its dielectric strength. The combination of the reduced distance between the housing and center electrode and the local increase in the electric field promotes the occurrence of flashovers in the region of the metallic inner seal.
  • the seal contains a non-conductive material.
  • the gasket is entirely made of a non-conductive material.
  • the seal has a core and a shell, wherein the shell consists of the non-conductive material.
  • the sheath is at least partially, in particular completely, formed on the surface of the core.
  • a non-conductive material such as non-metals, has an electrical conductivity of less than 10 "10 L / Qcm at room temperature.
  • the material used for the seal should not only be non-conductive, but also plastically deformable. This has the advantage that during assembly, the seal of the non-conductive material, the geometry and the
  • a plastically deformable material is a plastic material which assumes permanent deformations only above its yield point, according to the definitions of "plastic material”, “plastic flow” and “plasticity” in DIN 1342-1 and DIN 1342-3.
  • the seal is intended to be the transition between the components to be sealed
  • gas-tight seal ie that the leakage rate of the transition between the components to be sealed is ideally less than 10 "7 mbar * l / s.
  • the non-conductive material for the seal should be plastically deformable at least at room temperature.
  • the non-conductive material should also have a larger
  • Temperature range such as -60 ° C to 650 ° C, preferably for a temperature range of - 40 ° C to 550 ° C or -30 ° C to 450 ° C, be plastically deformable. So as not to reduce the elasticity of the non-conductive material and the gasket, and thus also the plastic deformability of the non-conductive material and the gasket during operation of the spark plug. This could cause the seal to lose its sealing properties.
  • the non-conductive material is temperature resistant. It is preferably provided that the non-conductive material for the seal is temperature resistant for temperature up to at least 550 ° C or preferably up to at least 400 ° C. As a result, the seal takes in the in the Spark plug operating temperatures no harm and does not lose their sealing property over time.
  • the non-conductive material for the seal should be pressure-resistant, in particular for pressures up to 200 bar, in order to withstand the pressures prevailing in the combustion chamber during engine operation.
  • the non-conductive material should be resistant to oxidation and / or corrosion in the conditions typically occurring during operation of the spark plug, in particular at pressures up to 200 bar and temperatures up to 400 ° C. This would have the advantage that the seal does not lose its sealing properties during operation and the spark plug has a longer life.
  • the non-conductive material has a relative permittivity of less than 10, preferably less than 9. This results in a high dielectric strength of the insulator and the spark plug is achieved.
  • a polymer or a ceramic material or carbon layers may be used for the seal as a non-conductive material.
  • a polymer for example, a plastic or a varnish, e.g. Insulating varnish to be used as a non-conductive material for the seal.
  • Ceramic material for example, offer oxide ceramics.
  • Materials are non-conductive and have a high temperature resistance.
  • carbon layers in the sense of VDI guideline 2840: 2005-11, for example diamond-like-carbon (DLC) layers can be used as non-conductive material for the gasket, in particular as material for the shell.
  • DLC diamond-like-carbon
  • an oxide ceramics of the titanate group e.g. Strontium titanate (SrTi03) can be used.
  • Strontium titanate combines all the aforementioned properties that the non-conductive material should have. It is plastically deformable for the temperature range from -100 ° C to 600 ° C as well
  • the seal made of a nonconductive material may have a round or oval or polygonal cross section.
  • the non-conductive seal is annular.
  • the seal is formed of a non-conductive material as an inner seal and is arranged in the space of insulator and housing.
  • a plurality of inner seals are provided and it is at least one of the inner seals of the non-conductive material.
  • the inner seal closest to the combustion chamber contains or is made of a non-conductive material, since the distance between the housing and center electrode is the lowest in the region of this inner seal and thus increases the risk of flashovers and misfires in the case of spark plugs with metallic seals known from the prior art is.
  • Inner gasket may contain or consist of other internal gaskets or gaskets of a non-conductive material.
  • at least one seal made of nonconductive material can also be arranged on the end of the insulator-housing transition facing away from the combustion chamber, e.g. in the area of the hexagon intended for mounting on the housing.
  • FIG. 1 shows an example of a spark plug according to the invention.
  • Figure 2 shows an example of a gasket with core and shell. Description of the embodiment
  • a spark plug 1 shows a schematic representation of a spark plug 1, which comprises a housing 3, an insulator 2 arranged in the housing 3, a center electrode 8 arranged in the insulator 2 and a ground electrode 9 arranged on the housing 3.
  • the center electrode 8 and earth electrode 9 are arranged to each other so that between their combustion chamber side ends forms a spark gap.
  • the ground electrode 9 and / or the center electrode 8 may have platelets made of a corrosion-resistant and / or erosion-resistant metal, for example a noble metal or a noble metal alloy, such as Pt, Pd, Ir, Re and / or Rh, at their combustion chamber ends.
  • a contact pin 4 is arranged in the insulator 2, via which the spark plug 1 is contacted with an ignition coil, not shown here.
  • the electrical contact between the contact pin 4 and center electrode 8 is produced by a Panat.
  • the Panat layer may be constructed, for example, two Maispanaten 5,7 and a suitsspanat 6.
  • the Panat 5, 6, 7 seals the insulator - center electrode - contact pin transitions against the
  • the housing 3 has a thread, wherein the thread is arranged closer to the combustion chamber than the outer seal 10.
  • the threaded portion of the housing 3 is referred to as the combustion chamber side end of the housing.
  • the rest of the housing, which faces away from the combustion chamber, is called the end of the housing facing away from the combustion chamber.
  • a first inner seal 11 is arranged in the region of the combustion chamber-side end of the housing, in particular arranged closer to the combustion chamber than the outer seal 10.
  • the outer seal 10 is arranged closer to the combustion chamber than a second inner seal 12.
  • the second inner seal 12 is in the region of
  • first inner seal 11 and the second inner seal 12 further inner seals may be provided in the insulator-housing transition.
  • the first inner seal 11 is arranged in the region of the combustion-chamber-side end of the insulator-housing transition, in particular in the region of the foot of the insulator.
  • the housing for example, on its inside its
  • the first inner seal 11 is designed as a sealing ring and consists of a polymer or an oxide ceramic, such. Strontium titanate.
  • Figure 2 is a cross section of an alternative construction of the seal or the
  • the gasket or inner gasket 11, 12 comprises a core 16 made, for example, of a conductive material and / or a metal, and a shell 15, the shell 15 being made of the non-conductive material described above.
  • deemeddichtung 11, 12 is that the non-conductive material does not necessarily have to meet all the requirements described above as a seal or a
  • Inner seal 11, 12 which consists entirely of the non-conductive material.
  • the core may be plastically deformable, while the sheath of the non-conductive material provides for the electrical insulation of the seal, so that as with a completely made of the non-conductive material seal the effective distance from the electrical housing potential to the insulator or the Mittelelektroden- Potential is greater than in the prior art.
  • the sheath 15 preferably has a layer thickness of at least 2 mm.
  • the layer thickness is preferably at most 850 mm.
  • the layer thickness is preferably at most 850 mm.
  • Layer thickness of the sheath 15 in the range of 10 mm to 650 mm, preferably in the range of 25 mm to 450 mm.
  • the layer thickness is selected to suit the prevailing conditions, such as material used, pressure, electrical potential, and / or temperature, in the intended use, such that the sheath has sufficiently high electrical insulation and mechanical strength such that the dielectric strength of the insulator and the spark plug is granted.
  • mechanical strength is meant in this context that the shell does not flake off the core during assembly of the spark plug and thereby the seal as a whole loses its electrical insulating properties.

Landscapes

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

Abstract

Bougie d'allumage (1), notamment pour moteur à combustion interne, comprenant un boîtier (3), un isolateur (2) disposé dans le boîtier (3), une électrode centrale (8) disposée dans un isolateur (2) et au moins une électrode de masse (9) disposée sur l'extrémité côté chambre de combustion du boîtier (3), la bougie d'allumage (1) présentant au moins un joint, ce joint contenant une matière non conductrice constituée notamment d'une matière non conductrice.
PCT/EP2014/074022 2013-12-19 2014-11-07 Bougie d'allumage dotée d'un joint en matière non conductrice Ceased WO2015090723A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013226667.7A DE102013226667B4 (de) 2013-12-19 2013-12-19 Zündkerze mit Dichtung aus einem nichtleitenden Material
DE102013226667.7 2013-12-19

Publications (1)

Publication Number Publication Date
WO2015090723A1 true WO2015090723A1 (fr) 2015-06-25

Family

ID=51866163

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/074022 Ceased WO2015090723A1 (fr) 2013-12-19 2014-11-07 Bougie d'allumage dotée d'un joint en matière non conductrice

Country Status (2)

Country Link
DE (1) DE102013226667B4 (fr)
WO (1) WO2015090723A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018117212A1 (de) 2018-07-17 2020-01-23 Federal-Mogul Ignition Gmbh Zündkerze mit polymerem Dichtungsring
US11473485B2 (en) 2018-12-20 2022-10-18 Caterpillar Energy Solutions Gmbh Cooling of the spark plug with improved contact surface

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB586014A (en) * 1943-07-13 1947-03-04 Bendix Aviat Corp Spark plug and method of making the same
US3012084A (en) * 1958-12-17 1961-12-05 Neutronic Dev Corp Ignition device
US3295005A (en) * 1963-10-28 1966-12-27 Champion Spark Plug Co Ceramic sealing structure
DE2721843A1 (de) * 1976-05-18 1977-12-08 Meister & Co H Runddichtungsring fuer statische abdichtung und verfahren zu dessen herstellung
US4417733A (en) * 1978-10-10 1983-11-29 Metex Corporation Method of producing high temperature composite seal
EP1923609A1 (fr) * 2005-08-09 2008-05-21 Best Corporation Joint annulaire pour raccords spheriques de tuyaux d'echappement et son procede de fabrication

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193012A (en) 1978-10-10 1980-03-11 Champion Spark Plug Company Spark plug seal
DE4029624A1 (de) 1989-09-29 1991-04-11 Ntm Nova Tec Motor Ltda Vorrichtung zum zufuehren von luft in einen verbrennungsmotor nach der verbrennung und zuendkerze zur verwendung in dieser vorrichtung
JP2003077620A (ja) 2001-06-20 2003-03-14 Denso Corp スパークプラグおよびその製造方法
JP2005190762A (ja) 2003-12-25 2005-07-14 Ngk Spark Plug Co Ltd スパークプラグおよびその製造方法
DE102006043593B3 (de) 2006-09-16 2008-04-10 Multitorch Gmbh Zündkerze
FR2965984B1 (fr) 2010-10-12 2012-10-12 Renault Sa Prevention contre un court-circuit de la bougie rf
DE112013002420T5 (de) 2012-05-09 2015-02-05 Federal-Mogul Holding Deutschland Gmbh Zündkerze mit erhöhter mechanischer Festigkeit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB586014A (en) * 1943-07-13 1947-03-04 Bendix Aviat Corp Spark plug and method of making the same
US3012084A (en) * 1958-12-17 1961-12-05 Neutronic Dev Corp Ignition device
US3295005A (en) * 1963-10-28 1966-12-27 Champion Spark Plug Co Ceramic sealing structure
DE2721843A1 (de) * 1976-05-18 1977-12-08 Meister & Co H Runddichtungsring fuer statische abdichtung und verfahren zu dessen herstellung
US4417733A (en) * 1978-10-10 1983-11-29 Metex Corporation Method of producing high temperature composite seal
EP1923609A1 (fr) * 2005-08-09 2008-05-21 Best Corporation Joint annulaire pour raccords spheriques de tuyaux d'echappement et son procede de fabrication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018117212A1 (de) 2018-07-17 2020-01-23 Federal-Mogul Ignition Gmbh Zündkerze mit polymerem Dichtungsring
US10651631B2 (en) 2018-07-17 2020-05-12 Federal-Mogul Ignition Gmbh Spark plug with polymer sealing ring
US11473485B2 (en) 2018-12-20 2022-10-18 Caterpillar Energy Solutions Gmbh Cooling of the spark plug with improved contact surface

Also Published As

Publication number Publication date
DE102013226667B4 (de) 2018-03-01
DE102013226667A1 (de) 2015-06-25

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