EP2962370B1 - Zündkerze - Google Patents

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Publication number
EP2962370B1
EP2962370B1 EP14706033.9A EP14706033A EP2962370B1 EP 2962370 B1 EP2962370 B1 EP 2962370B1 EP 14706033 A EP14706033 A EP 14706033A EP 2962370 B1 EP2962370 B1 EP 2962370B1
Authority
EP
European Patent Office
Prior art keywords
insulator
spark plug
housing
seat
rounded portion
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
EP14706033.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2962370A1 (de
Inventor
Hermann Kersting
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
Priority to PL14706033T priority Critical patent/PL2962370T3/pl
Publication of EP2962370A1 publication Critical patent/EP2962370A1/de
Application granted granted Critical
Publication of EP2962370B1 publication Critical patent/EP2962370B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding
    • 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

Definitions

  • the present invention relates to a spark plug for an internal combustion engine.
  • the prior art knows a wide variety of designs for spark plugs for internal combustion engines.
  • the spark plugs are used to ignite a fuel mixture.
  • the spark plugs have a large number of transitions when the cross-section changes. These transitions are usually rounded.
  • the fillets usually describe a segment of a circle. The fillets are typical weak points for the mechanical failure of a spark plug.
  • the JP S51 15526 U discloses a spark plug according to the preamble of claim 1.
  • the roundings on the cross-sectional changes of the individual components of the spark plug are designed in accordance with the load that occurs. This improves the mechanical and electromechanical strength and durability of the spark plug.
  • the spark plug is simple and inexpensive to manufacture and can be used with little maintenance.
  • at least one rounding on the spark plug is designed such that, when viewed in cross section, it no longer corresponds to a circular segment.
  • the leg lengths of the rounding are designed differently and can therefore correspond to the force acting on the rounding or on the cross-sectional transition be constructed.
  • a spark plug comprising a housing, an insulator inserted into the housing, a center electrode inserted into the insulator and a connecting bolt inserted into the insulator.
  • the insulator serves to electrically isolate the center electrode and the connecting bolt from the housing.
  • An ignition spark is generated with the center electrode on a side of the spark plug facing the combustion chamber.
  • the connecting bolt is used to connect a cable or a plug.
  • a ground electrode is preferably connected to the housing in an electrically conductive manner and is also positioned on the side of the spark plug facing the combustion chamber.
  • the rounding viewed in cross section has a first leg length and a second leg length angled to the first leg length. If you look at the rounding in cross-section, the rounding changes to a straight line at two transition points. The leg lengths are measured from one transition point to the other transition point. One leg length is measured parallel to one of the straight lines. The first leg length is greater than the second leg length. The first leg length is at least 1.3 times the second leg length.
  • the rounding can be designed in accordance with the force.
  • the rounding used according to the invention is mechanically more stable than the conventional circular rounding.
  • the term “rounding” describes a curve which is tangential to the legs and, between its beginning and end, can have a general shape. This general form can be described, for example, by a hyperbola, ellipse, parabola, evolute, involute, bezier curve, spline, or the like.
  • the curve is preferably tangentially continuous.
  • the first leg length is preferably at least 1.5 times, particularly preferably at least 2 times, the second leg length. This allows a sufficient response to the one-sided force on the fillet.
  • the first leg length is arranged perpendicular to the greatest force acting on the rounding.
  • the first leg length is perpendicular to the central axis of the spark plug.
  • the two leg lengths are each defined between two transition points, the rounding at the transition points becoming a straight line.
  • the two leg lengths are measured parallel to one of the two straight lines into which the fillet merges.
  • the connecting bolt preferably comprises a bolt shank and a collar.
  • the connecting bolt rests on the insulator with the collar.
  • the rounding is preferably formed at the transition from the collar to the bolt shank.
  • the first leg length preferably extends in the direction of the collar, that is, perpendicular to the central axis of the spark plug. This reduces the maximum tensile stress and thus avoids or reduces stress corrosion cracking.
  • the housing preferably comprises a shaft on which a thread, a polygon and a shrink groove are formed.
  • the thread is used to screw the spark plug into an engine block.
  • a tool for screwing in the spark plug can be attached to the polygon.
  • the rounding is preferably formed at the transition from the shaft to the thread, in particular thread recess.
  • the first leg length preferably extends perpendicular to the central axis, whereby a reduction in the maximum tensile stress at this rounding is achieved.
  • the rounding is formed at the transition from the shank to the shrink recess and / or at the transition from the polygon to the shrink recess.
  • the first leg length preferably extends perpendicular to the central axis, so that a reduction in the maximum tensile stress is achieved.
  • the center electrode preferably has a first seat on a change in cross section. This first seat rests on the isolator. This location of the insulator is referred to as the center electrode seat.
  • the insulator itself preferably has a second seat on a change in cross section. With this second seat, the insulator rests on the housing. The corresponding location on the housing is called the isolator seat.
  • the insulator has a housing seat on a change in cross section. A side of the housing facing away from the combustion chamber rests on this housing seat.
  • the rounding is preferably formed on the first seat and / or second seat and / or center electrode seat and / or insulator seat and / or housing seat. As a rule, there are two roundings on each of these different seats, which are constructed in accordance with the embodiment according to the invention. At the first seat (on the center electrode), the rounding serves to reduce the maximum tensile / bending stresses and thus to avoid or reduce center electrode breaks.
  • the housing seat of the insulator is designed as a collar on which the housing rests. The use of the rounding at the transition from the head of the insulator to the collar reduces the maximum bending stress and thus significantly increases the head bending strength of the insulator.
  • the rounding at the transition from the center electrode seat to the center electrode bore of the insulator reduces the maximum internal bending stress at the insulator and at the same time reduces the electrical field increase in interaction with the geometry change of the center electrode in the area of the first seat.
  • the isolator at the second seat merges into a so-called foot cone.
  • This foot cone is the end of the insulator facing the combustion chamber.
  • the rounding with the different leg lengths is preferably used.
  • this type of rounding can preferably be used at all cross-sectional transitions of the spark plug.
  • FIG. 1 shows a semi-sectional view of a spark plug 1.
  • the spark plug 1 comprises a housing 2.
  • An insulator 3 is inserted into the housing 2.
  • the housing 2 and the insulator 3 are each hollow on the inside.
  • a center electrode 4 is inserted into the insulator 3.
  • a connector pin 5 is inserted in the insulator 3.
  • the Panat 6 connects the center electrode 4 to the connector pin 5 in an electrically conductive manner
  • the corresponding ignition spark is generated between the ground electrode 7 and the center electrode 4.
  • the spark plug 1 extends around a central axis 8.
  • the housing 2 has a shaft 9.
  • a polygon 10, a shrink groove 11 and thread 12 are formed on this shaft 9.
  • the thread 12 is used to screw the spark plug 1 into an internal combustion engine.
  • the connecting bolt 5 comprises a bolt shank 14, which extends along the central axis 8, and a collar 13. With the collar 13, the connecting bolt 5 lies on the insulator 3.
  • the insulator 3 has an insulator collar 23 and a foot cone 28.
  • the insulator 3 comprises a center electrode seat 16 at the transition to the base cone 28.
  • the center electrode 4 with a first seat 15 rests on this center electrode seat 16.
  • the housing 2 has an insulator seat 18 on its inside.
  • a second seat 17 is formed on the insulator 3. This second seat 17 rests on the isolator seat 18. Depending on the temperature of the spark plug 1, there may be a gap between the second seat 17 and the insulator seat 18.
  • the insulator 3 has a housing seat 19 on its insulator collar 23. The housing 2 rests on this housing seat 19.
  • the geometry of the fillets 20 shows the Figures 3 and 4 in detail. A cross section of the fillet 20 can be seen in both figures.
  • Figure 3 shows that the rounding 20 merges into a straight line at both ends.
  • the transition points from the fillet 20 to the straight line are provided with the reference number 24.
  • a first leg length 21 and a second leg length 22 are measured between the two transition points 24.
  • the two leg lengths are of the same length, corresponding to the two reference symbols 22 and 22 '.
  • the first leg length 21 is substantially longer than the second leg length 22.
  • the first leg length 21 is defined in accordance with the force 25 acting on the fillet 20. In particular, tensile stress occurs in the direction of the central axis 8 in the spark plug 1, so that the first leg length 21 is defined perpendicular to the central axis 8 at the corresponding fillets 20.
  • Figure 4 also shows the fillet 20 viewed in cross section.
  • the final contour of the fillet 20 and the ratio of the two leg lengths 21, 22 are determined by means of the three straight lines 27.
  • Figure 4 shows to Compare the course of a conventional rounding 26 with two legs of equal length.
  • the fillet 20 according to the invention can be applied to all cross-sectional transitions of the spark plug 1.

Landscapes

  • Spark Plugs (AREA)
EP14706033.9A 2013-03-01 2014-02-21 Zündkerze Active EP2962370B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14706033T PL2962370T3 (pl) 2013-03-01 2014-02-21 Świeca zapłonowa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013203566.7A DE102013203566A1 (de) 2013-03-01 2013-03-01 Zündkerze
PCT/EP2014/053451 WO2014131705A1 (de) 2013-03-01 2014-02-21 Zündkerze

Publications (2)

Publication Number Publication Date
EP2962370A1 EP2962370A1 (de) 2016-01-06
EP2962370B1 true EP2962370B1 (de) 2020-08-05

Family

ID=50156768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14706033.9A Active EP2962370B1 (de) 2013-03-01 2014-02-21 Zündkerze

Country Status (9)

Country Link
US (1) US9819155B2 (pl)
EP (1) EP2962370B1 (pl)
JP (1) JP6186014B2 (pl)
CN (1) CN105009389B (pl)
BR (1) BR112015020538B1 (pl)
DE (1) DE102013203566A1 (pl)
ES (1) ES2827958T3 (pl)
PL (1) PL2962370T3 (pl)
WO (1) WO2014131705A1 (pl)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6422841B2 (ja) * 2015-10-20 2018-11-14 日本特殊陶業株式会社 スパークプラグ
DE102019126831A1 (de) 2018-10-11 2020-04-16 Federal-Mogul Ignition Llc Zündkerze
DE102018222460A1 (de) 2018-12-20 2020-06-25 Robert Bosch Gmbh Zündkerze mit verrundetem Isolatorfuß-Abschnitt
DE102018222475A1 (de) * 2018-12-20 2020-06-25 Robert Bosch Gmbh Zündkerze mit verrundetem Gehäuse-Abschnitt
DE102018222468A1 (de) * 2018-12-20 2020-06-25 Robert Bosch Gmbh Zündkerze mit verrundetem Isolatorfuß-Abschnitt und verrundetem Gehäuse-Abschnitt
DE102020206970A1 (de) 2020-06-04 2021-12-09 Robert Bosch Gesellschaft mit beschränkter Haftung Zündkerze

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5115526U (pl) * 1974-07-22 1976-02-04

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3876071B2 (ja) * 1998-06-03 2007-01-31 日本特殊陶業株式会社 スパークプラグ
JP4596700B2 (ja) * 2001-07-26 2010-12-08 日本特殊陶業株式会社 スパークプラグ
JP2004022450A (ja) * 2002-06-19 2004-01-22 Denso Corp 内燃機関用スパークプラグ
JP4220308B2 (ja) * 2003-05-29 2009-02-04 株式会社デンソー スパークプラグ
DE10340043B4 (de) * 2003-08-28 2014-10-30 Robert Bosch Gmbh Zündkerze
DE10342912A1 (de) * 2003-09-17 2005-04-21 Bosch Gmbh Robert Zündkerze
JP2005129377A (ja) * 2003-10-24 2005-05-19 Denso Corp スパークプラグ
JP4534870B2 (ja) * 2004-07-27 2010-09-01 株式会社デンソー スパークプラグ
JP4730747B2 (ja) 2007-03-29 2011-07-20 日本特殊陶業株式会社 スパークプラグおよびその製造方法
JP5525454B2 (ja) * 2008-01-28 2014-06-18 フラム・グループ・アイピー・エルエルシー 高い位置のねじ山の接地シールド
JP2010267425A (ja) * 2009-05-13 2010-11-25 Ngk Spark Plug Co Ltd スパークプラグ
DE102009047055A1 (de) * 2009-11-24 2011-05-26 Robert Bosch Gmbh Zündkerze für eine Verbrennungskraftmaschine
DE102009055397A1 (de) * 2009-12-30 2011-07-07 Robert Bosch GmbH, 70469 Zündkerze
JP5134044B2 (ja) * 2010-06-22 2013-01-30 日本特殊陶業株式会社 内燃機関用スパークプラグ
JP4928626B2 (ja) 2010-09-21 2012-05-09 日本特殊陶業株式会社 スパークプラグ
JP4874415B1 (ja) * 2010-10-29 2012-02-15 日本特殊陶業株式会社 スパークプラグ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5115526U (pl) * 1974-07-22 1976-02-04

Also Published As

Publication number Publication date
US9819155B2 (en) 2017-11-14
WO2014131705A1 (de) 2014-09-04
CN105009389B (zh) 2018-04-24
BR112015020538A2 (pt) 2017-07-18
EP2962370A1 (de) 2016-01-06
JP6186014B2 (ja) 2017-08-23
CN105009389A (zh) 2015-10-28
ES2827958T3 (es) 2021-05-25
PL2962370T3 (pl) 2021-01-11
JP2016508663A (ja) 2016-03-22
BR112015020538B1 (pt) 2021-11-30
US20160006220A1 (en) 2016-01-07
DE102013203566A1 (de) 2014-09-04

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