EP3192138A1 - Isolant en céramique pour bougie d'allumage, bougie d'allumage et utilisation d'une glaçure sur un isolant de bougie d'allumage - Google Patents

Isolant en céramique pour bougie d'allumage, bougie d'allumage et utilisation d'une glaçure sur un isolant de bougie d'allumage

Info

Publication number
EP3192138A1
EP3192138A1 EP15739600.3A EP15739600A EP3192138A1 EP 3192138 A1 EP3192138 A1 EP 3192138A1 EP 15739600 A EP15739600 A EP 15739600A EP 3192138 A1 EP3192138 A1 EP 3192138A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
insulator
surface area
plug insulator
glaze
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.)
Granted
Application number
EP15739600.3A
Other languages
German (de)
English (en)
Other versions
EP3192138B1 (fr
Inventor
Klaus BUNDSCHUH
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 EP3192138A1 publication Critical patent/EP3192138A1/fr
Application granted granted Critical
Publication of EP3192138B1 publication Critical patent/EP3192138B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H01T13/38—Selection of materials for 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
    • H01T13/02—Details
    • H01T13/08—Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber
    • 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 present invention relates to a ceramic spark plug insulator, a spark plug including the same, and a use of a glaze on a spark plug insulator.
  • the protagonistkehle is a portion of the spark plug insulator, in which the cross section is tapered or slimmed in the direction of Isolatorfußspitze. The protagonistkehle reflects the
  • the spark plug insulator which has a first length L A in the axial direction XX of the spark plug insulator, reduces open pores and depressions, such as occur during the grinding process of the insulator, are closed.
  • the length L A is defined as the maximum length in the axial direction XX of the spark plug insulator. This will be local
  • the glaze forms a kind of protective layer, which improves the strength of the spark plug insulator in mechanically stressed areas, such as e.g. the foot, increased.
  • mechanically stressed areas such as e.g. the foot
  • Cross section of the spark plug insulator can be reduced in the area of the foot and in the area adjacent to the contemplatkehle insulator areas.
  • a mechanical compressive stress can be built up, which leads to a partial pre-compensation of a tensile stress under the action of
  • the spark plug insulator comprises an adjacent second surface region B lying from the foot groove in the direction of the insulator head, with a second length L B defined in the axial direction XX of the spark plug insulator and an adjacent third adjacent to the root groove Surface area C with a third length L c defined in the axial direction XX of the spark plug insulator.
  • the lengths of the respective surface areas are respectively defined as maximum lengths in the axial direction XX of the spark plug insulator.
  • the second surface area B In order to avoid a notch formation in the area of the foot-surrounding area particularly effectively and thus to further improve the mechanical transverse loadability of the spark plug insulator, it is further advantageous for the second surface area B to have a glazed fourth surface area D adjacent to the foot-throat and a to the fourth
  • unglazed fifth surface area E includes.
  • Surface area D extends from the foot groove up to 4 mm and in particular up to 3 mm, in the direction of the insulator head of the
  • Surface region C comprises a glazed sixth surface region F adjacent to the footthorn having a sixth length L F and an unglazed seventh surface region G having a seventh length L G adjoining the sixth surface region F in the direction of an insulator foot tip, the lengths being in each case as maximum lengths in
  • Axial direction XX of the spark plug insulator are defined, and the following relation is satisfied: L F > L G.
  • the sixth length L F of the sixth surface region F satisfies the relation: 4 mm ⁇ L F (L A + L E + L F ) / 2, the lengths being respectively defined as maximum lengths in the axial direction XX of the spark plug insulator , In addition, shunts (gliding sparks) on the foot groove can be better avoided.
  • the installation area connects insulator head side to the contemplatkehle and thus has the second surface area B.
  • the installation area comprises a waistband and a collar height adjoining the waistband in the direction of the insulator head.
  • a waistband is understood to mean a region of the spark plug insulator which reduces in cross section in the direction of the insulator foot.
  • a collar height is the area of the spark plug insulator, which usually includes a hexagon, which facilitates the installation of the spark plug in an engine block.
  • the Bundiere thus represents one of the other, surrounding
  • Sections of the spark plug insulator in cross-section widened section are Sections of the spark plug insulator in cross-section widened section.
  • an eighth surface area H of the waistband facing the outside of the spark plug insulator also has a glaze.
  • the eighth surface area H not only has a surface area of the collar throat facing the outside of the spark plug insulator, ie the eighth surface area H, with an eighth length L H glaze, but also adjoins the waistband and thus the waistband in Direction of the insulator head adjacent, ninth
  • Waist height is thus glazed on a ninth length U.
  • Si0 2 37.0 to 46.0% by weight, preferably 37.0 to 44.0% by weight
  • B 2 O 3 12.0 to 28.0% by weight, preferably 17.5 to 23.0% by weight
  • Al 2 O 3 4.0 to 21, 0 wt .-%, preferably 8.5 to 16.0 wt .-%
  • ZnO 6.0 to 1 1, 4 wt .-%, preferably 7.8 to 1 1, 4 wt .-%
  • F 0.6 to 4 wt.%, Preferably 0.6 to 3.0 wt.%
  • Na 2 O 0.1 to 2.5 wt.%
  • K 2 0 0.5 to 4.5 wt .-%, preferably 3.0 to 4.5 wt .-%
  • CaO 1, 8 to 6 wt .-%, preferably 2.1 to 4.2 wt .-%
  • a layer thickness of the glaze is on average 5 to 40 ⁇ m and in particular 7 to 25 ⁇ m.
  • Also according to the invention is also a spark plug for a
  • An internal combustion engine comprising a metallic housing, a center electrode, at least one ground electrode disposed on the housing, and a ceramic spark plug insulator as described above to separate the center electrode from the ground electrode.
  • the spark plug according to the invention is characterized by space-saving design due to the partially applied to the outside of the spark plug insulator applied glaze by a high Durglerfestmaschine and good mechanical strength. The electrical strength and the mechanical strength of the spark plug, and thus their life, are high.
  • the glaze is also designed so that it is possible to dispense with an inner seal, as a rule a sealing ring, for gas-tight sealing of the combustion chamber between the ground electrode and the center electrode.
  • the glaze can also all
  • Figure 1 is a partial sectional view of a first invention
  • FIG. 2 is a partial sectional view of the spark plug of FIG. 1;
  • FIG. 3 shows an enlarged detail of the partial sectional view of FIG
  • Figure 4 is an enlarged detail of a partial sectional view of a
  • the spark plug 100 comprises a ground electrode 13, a center electrode 8 and a ceramic
  • a metallic housing 7 surrounds the
  • Spark plug insulator 10 at least partially.
  • a thread 15 is arranged, which is for a fastening of the spark plug 100 in a
  • Cylinder head 14 is designed.
  • a sealing ring 1 1 seals the combustion chamber of the spark plug 100 gas-tight.
  • FIG. 2 is a partial sectional view of the spark plug 100 of Figure 1 and
  • the spark plug insulator 10 has an electrical direction
  • Connection area 5 aligned insulator head 1 and a combustion chamber side Isolatorfuß 2 on. Between the insulator head 1 and the insulator 2 a mounting area 3 is arranged, which comprises a cross-sectional reduction, a so-called waist 9a and a waist 9b.
  • a so-called foot throat 4 a transition area between the insulator base 2 located in the combustion space and that outside the combustion chamber lying insulator area.
  • the combustion chamber as shown here, be sealed gas-tight from the area outside the combustion chamber by a sealing ring 1 1.
  • Theticiankehle 4 has a directed to the outside of the spark plug insulator 10 first surface area A with an axial direction X-X of the
  • Spark plug insulator defined first length L A has a glaze 12 and is thus glazed. At one of the foot 4 in the direction of the
  • the insulator base 2 In an adjacent section of the spark plug insulator 10 lying on the side of the root of the combustion chamber 4, the insulator base 2 has a third surface area C directed towards the outside of the spark plug insulator 10. The surface area C is unglazed.
  • the waist 9a has on one to the outside of the spark plug insulator 10 directed eighth surface area H with an eighth length L H a glaze 12.
  • the waist 9b has a surface area I with a ninth length U and one in the direction of the insulator head 1 at the ninth
  • FIG. 3 is a detailed view of a section of the transition region between the insulator base 2 located in the combustion chamber and the region of the spark plug insulator 10 of the spark plug 100 of FIGS. 1 and 2 located outside the combustion chamber.
  • the surface area of the foot groove 4 coincides with the first
  • the glaze 12 advantageously has an average layer thickness of 5 to 40 ⁇ , in particular from 7 to 25 ⁇ .
  • the glaze 12 significantly increases the flexural strength of the ceramic insulator. It lies for the spark plug 100 according to the invention at over 850 N, while corresponding unglazed spark plugs have only bending strengths of about 660 N. Also the breakdown strengths of
  • Spark plugs 100 according to the invention are significantly increased and amount to at least about 42 kV, while comparable conventional spark plugs have breakdown strengths of only about 35 kV.
  • the first surface area A has a first length L A , the second
  • Spark plug insulator 10 thus results from: L A + L c .
  • FIG. 4 is a detailed view of a section of the transition region between the insulator base 2 located in the combustion chamber and the region of the spark plug insulator 10 of a spark plug 100 according to the invention located outside the combustion chamber.
  • the second surface area B comprises a fourth surface area D adjacent to the foot groove 4 and a fifth surface area E adjoining the fourth surface area D in the direction of the insulator head 1.
  • the fourth surface area D points, as well as the first surface area A, a glaze 12 on.
  • the glazed surface area is thus extended starting from the statkehle 4 in the direction of the insulator head 1, namely, the glazed fourth surface area D extends from the solicitkehle 4 up to 4 mm, in particular up to 3 mm, in the direction of the insulator head first
  • the third surface area C comprises a glazed sixth surface area F adjoining the foot groove 4 and an insulator foot tip 6 extending to the sixth surface area F
  • the glazed sixth surface region F extends from the foot groove 4 on the combustion chamber side to a maximum of 2 mm in front of the insulator base tip 6 on the combustion chamber side, which prevents notch formation due to mechanical stress.
  • the glazed sixth surface region F has a sixth length L F and the following relation is satisfied: 4 mm ⁇ L F ⁇ (L A + L F + L G ) / 2, the lengths each defining maximum lengths in the axial direction XX of the spark plug insulator are.
  • the glazed total surface area A comprises the surface area of the solicitkehle A and extends here in the direction of the insulator head 1 on the first surface area A of the contemplatkehle 4 addition to the fourth surface area D and the combustion chamber side on the sixth surface area F. This contributes to the lateral load capacity of the Spark plug insulator 10 at.
  • the first surface area A has a first length L A
  • the second surface area B has a second length L B
  • Surface area C is a third length L c and the fourth surface area D is a fourth length L D
  • the fifth surface area E is a fifth length L E
  • the sixth surface area F is a sixth length L F and the seventh
  • the total length of the insulator foot 2 is also given by: L A + L F + L G.
  • the respective lengths are maximum lengths and are defined in the axial direction XX of the spark plug insulator 10.
  • the sixth glazed surface area F has a length L F and the unglazed, the insulator foot tip 6 directed seventh surface area G has a length L G and the following relation is satisfied: L F > L G.
  • the spark plugs 100 are characterized by space-saving design by a high dielectric strength and very good mechanical strength.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)

Abstract

L'invention concerne un isolant en céramique pour bougie d'allumage présentant une résistance mécanique et électrique améliorée.
EP15739600.3A 2014-09-10 2015-07-22 Isolant en céramique pour bougie d'allumage, bougie d'allumage et utilisation d'une glaçure sur un isolant de bougie d'allumage Active EP3192138B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014218062.7A DE102014218062A1 (de) 2014-09-10 2014-09-10 Keramischer Zündkerzenisolator, Zündkerze und Verwendung einer Glasur auf einem Zündkerzenisolator
PCT/EP2015/066741 WO2016037751A1 (fr) 2014-09-10 2015-07-22 Isolant en céramique pour bougie d'allumage, bougie d'allumage et utilisation d'une glaçure sur un isolant de bougie d'allumage

Publications (2)

Publication Number Publication Date
EP3192138A1 true EP3192138A1 (fr) 2017-07-19
EP3192138B1 EP3192138B1 (fr) 2020-04-08

Family

ID=53716489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15739600.3A Active EP3192138B1 (fr) 2014-09-10 2015-07-22 Isolant en céramique pour bougie d'allumage, bougie d'allumage et utilisation d'une glaçure sur un isolant de bougie d'allumage

Country Status (6)

Country Link
US (1) US10038309B2 (fr)
EP (1) EP3192138B1 (fr)
JP (1) JP6415700B2 (fr)
CN (1) CN106605341B (fr)
DE (1) DE102014218062A1 (fr)
WO (1) WO2016037751A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6559740B2 (ja) * 2017-07-13 2019-08-14 日本特殊陶業株式会社 スパークプラグ
DE102018215204A1 (de) * 2018-09-07 2020-03-12 Robert Bosch Gmbh Zündkerze für ein Kraftfahrzeug und Verfahren zur Herstellung einer Zündkerze
CN111525395B (zh) * 2019-02-03 2022-11-15 罗伯特·博世有限公司 用于火花塞的绝缘器和火花塞
CN112608028A (zh) * 2020-12-31 2021-04-06 江苏南瓷绝缘子股份有限公司 一种高强度悬式绝缘子头部釉及其制备方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1355272A (en) * 1920-03-24 1920-10-12 Christian F Sauereisen Insulator
JPS59130079A (ja) 1983-01-14 1984-07-26 日本特殊陶業株式会社 スパ−クプラグ
JPH0650663B2 (ja) 1989-03-28 1994-06-29 日本特殊陶業株式会社 内燃機関用スパークプラグ
JPH10115424A (ja) * 1996-01-31 1998-05-06 Ngk Spark Plug Co Ltd スパークプラグ
US5985473A (en) * 1997-11-17 1999-11-16 Cooper Automotive Products, Inc. Low-temperature barium/lead-free glaze for alumina ceramics
JP4474724B2 (ja) * 1999-05-24 2010-06-09 株式会社デンソー 無鉛釉薬及びスパークプラグ
JP3510172B2 (ja) 2000-02-29 2004-03-22 日本特殊陶業株式会社 スパークプラグ
DE60107735T2 (de) * 2000-02-29 2005-12-08 NGK Spark Plug Co., Ltd., Nagoya Zündkerze
JP3511602B2 (ja) * 2000-09-29 2004-03-29 日本特殊陶業株式会社 スパークプラグ
DE10229338B4 (de) * 2002-06-29 2014-04-03 Robert Bosch Gmbh Zündkerze und Zündkerzenisolator
CN100511887C (zh) * 2005-08-19 2009-07-08 日本特殊陶业株式会社 火花塞
EP1976079B1 (fr) * 2007-03-30 2014-03-05 NGK Spark Plug Co., Ltd. Bougie d'allumage pour moteur à combustion interne
JP4473316B2 (ja) * 2007-03-30 2010-06-02 日本特殊陶業株式会社 内燃機関用スパークプラグ

Also Published As

Publication number Publication date
JP2017530519A (ja) 2017-10-12
WO2016037751A1 (fr) 2016-03-17
JP6415700B2 (ja) 2018-10-31
US20170256918A1 (en) 2017-09-07
CN106605341A (zh) 2017-04-26
EP3192138B1 (fr) 2020-04-08
CN106605341B (zh) 2019-04-02
DE102014218062A1 (de) 2016-03-10
US10038309B2 (en) 2018-07-31

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