EP0101547B1 - Hochspannungszündkerze - Google Patents

Hochspannungszündkerze Download PDF

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Publication number
EP0101547B1
EP0101547B1 EP83106476A EP83106476A EP0101547B1 EP 0101547 B1 EP0101547 B1 EP 0101547B1 EP 83106476 A EP83106476 A EP 83106476A EP 83106476 A EP83106476 A EP 83106476A EP 0101547 B1 EP0101547 B1 EP 0101547B1
Authority
EP
European Patent Office
Prior art keywords
end section
spark plug
terminal side
electrical insulator
longitudinal hole
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
Application number
EP83106476A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0101547A3 (en
EP0101547A2 (de
Inventor
Walter Benedikt
Klaus-Dieter Dr. Pohl
Rudolf Pollner
Christian Dr. Dipl.-Ing. Schaffrin
Leo Steinke
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 EP0101547A2 publication Critical patent/EP0101547A2/de
Publication of EP0101547A3 publication Critical patent/EP0101547A3/de
Application granted granted Critical
Publication of EP0101547B1 publication Critical patent/EP0101547B1/de
Expired 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
    • H01T13/20—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
    • H01T13/34—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
    • H01T13/39—Selection of materials for electrodes

Definitions

  • the invention relates to a high-voltage spark plug according to the preamble of the main claim.
  • a high-voltage spark plug is already known (GB-A-547 119), in which a relatively short center electrode made of platinum is located in the bottom of the combustion chamber on the longitudinal bore of the electrical insulating body of this spark plug; The central electrode is joined by a metal body in the longitudinal bore, which is pressed against the central electrode and the wall of the longitudinal bore by means of a stamp on the occasion of the spark plug assembly at temperatures in the range from 900 to 950 degrees Celsius. On the connection-side end of the metal body, an electrically conductive glass fusion is then arranged in the longitudinal bore in a known manner. The close contact between the metal body and the center electrode or the longitudinal bore wall serves for good heat dissipation from the ignition area of the spark plug.
  • a spark plug which has electrodes made of platinum or a platinum alloy and also has a pin-shaped metal body which is connected to the central electrode within the longitudinal bore of the insulating body; at its connection-side end section, the metal pin is embedded in an electrically-conductive sealing compound, in which the combustion-chamber-side end section of the connection bolt protruding from the longitudinal bore of the electrical insulating body is also anchored.
  • the GB publication does not contain any information on the type of connection between the center electrode and the metal pin, or information on the passage of the center electrode through the area of the electrical insulating body on the combustion chamber side; the claims of this GB publication are directed to a spark plug with a housing which is provided on its outside with a color which changes color at high operating temperatures.
  • the high-voltage spark plug according to the invention with the characterizing features of the main claim has the advantage that it is easier and cheaper to assemble in the area of its electrical insulating body, its central electrode, its metal body and its casting compound, and that it nevertheless fulfills the conditions with regard to its function (including heat dissipation) and service life able to fulfill. This is achieved in particular by the welded connection between the center electrode and the metal body.
  • FIG. 1 shows the side view of a high-voltage spark plug, shown enlarged, in a half-section
  • FIG. 2 shows the section through the combustion-chamber-side section of the electrical insulating body with the central electrode, metal body, casting compound and part of the connecting bolt, which is shown further enlarged.
  • the high-voltage spark plug 10 shown in FIGS. 1 and 2 has an essentially tubular metal housing 11, which has on its outside a screw thread 12, a hexagon key 13 and a sealing seat 14 as a means for installing the spark plug 10 in an engine head (not shown); In the region of its end on the combustion chamber side, this housing 11 has a ground electrode 15, which in the present example is designed as a welded wire, but can also be of a different configuration. In its stepped through bore 16, the metal housing 11 comprises, in a known manner, a rotationally symmetrical electrical insulating body 17.
  • This electrical insulating body 17 which for example essentially consists of aluminum oxide, has a so-called head 17/1 on the connection side, with a collar 17/2 in the direction of the combustion chamber Connect collar 17/3 and foot 17/4.
  • This electrical insulating body 17 lies with a shoulder 18, which is formed between the foot 17/4 and the collar shoulder 17/3, on a shoulder 19 in the through bore 16 of the metal housing 11;
  • a sealing ring 20 is usually arranged between the shoulder 18 and the shoulder 19.
  • the electrical insulating body 17 is held firmly and tightly in the metal housing 11.
  • the electrical insulating body 17 can also be sealed in the metal housing 11 by cementing or the like.
  • the electrical insulating body 17 has, in a known manner, a step-shaped longitudinal bore 24, which has a larger diameter in its connection-side area - the so-called head bore 24/1 - than the area on the combustion chamber side - the so-called foot bore 24/2; the foot hole 24/2 begins approximately in the area of the shoulder 17/3.
  • the foot hole 24/2 is closed by means of a molded-on, thin-walled base 25, in which there is a central electrode 26 which consists of precious metal or contains precious metal.
  • This center electrode 26 is preferably made of platinum or a platinum metal, extends coaxially to the longitudinal bore 24 of the electrical insulating body 17 and has a diameter of 0.3 mm; the maximum diameter of such a metallic center electrode is 0.5 mm.
  • the bottom 25 of the electrical insulating body 17 is only 1.5 mm thick, but can also be made thicker or thinner if necessary.
  • the central electrode 26 passing through this base 25 is sintered into the base 25 without a gap in the present example and protrudes 0.5 mm into the foot bore 24/2 of the electrical insulating body 17; depending on the embodiment, the connection-side end section of the center electrode 26 can also protrude up to 1 mm into the foot hole 24/2.
  • the center electrode 26 which can alternatively be installed without a gap in the bottom 25 of the electrical insulating body 17 by means of putty, glass or the like, is flush with the end face 27 of the electrical insulating body 17 and stands at a distance - the so-called spark gap 28 - the free end section opposite the ground electrode 15.
  • the combustion chamber-side end section of the center electrode 26 can also be of a different configuration, e.g. protrude from the end face 27 or be provided with a head.
  • the center electrode 26 shown with its diameter of 0.3 mm has a total length of 2 mm and is preferably sintered into the bottom 25 of the electrical insulating body 17 as a pin; depending on the selected thickness of the bottom 25 of the electrical insulating body 17 - preferably it is between 1 and 2.5 mm thick - the length of the center electrode 26 is also selected, which will then be between 1 and 3 mm.
  • the center electrode 26 can, however, also be introduced as a platinum suspension in a preformed bore in this area with a small diameter of the electrical insulation body 17 that has not yet been sintered, and can then be finish-sintered with the insulation body 17.
  • connection-side region of the center electrode 26 is provided with a recess 29 which is arranged axially to the center electrode 26 and is preferably of a conical or similar shape.
  • this recess 29 which according to the present example is 0.3 mm deep, the end section 30 of a metal body 31 serving as a contact pin projects into the combustion chamber; this metal body 31 with its end section 30 located on the combustion chamber side is preferably of circular cross section, consists of a relatively inexpensive material, but has good thermal conductivity, high corrosion resistance (with sufficient electrical conductivity of scale layers being formed), high corrosion resistance to avoid spark gaps and a coefficient of thermal expansion that is adapted to the ceramic material of the electrical insulating body 17.
  • This metal body 31 can consist, for example, of a nickel alloy, which is known under the trade name Vacon 20 (company VAC-Hanau), has a diameter of the order of 1.5 to 2.5 mm and extends somewhat into the head bore with its connection-side end section 24/1 of the electrical insulating body 17.
  • a head 32 is formed on the connection-side end section of the metal body 31, which is provided with a taper 33 pointing towards the connection area.
  • the head 32 of the metal body 31 lies closely in the foot hole 24/2 of the electrical insulating body 17; the combustion chamber end section of the metal body 31 is additionally fixed in a guide part 24/2 'of the foot hole 24/2.
  • connection side The end portion of the metal body 31 on the connection side, including the taper 33 of its head 32, and the region of the head bore 24/1 of the insulating body 17 which adjoins the connection side is filled with an electrically conductive casting compound 34; such casting compounds 34 are known per se (e.g. DE-PS 1206209, US-PS 2 106 578) and can additionally also contain layers (not shown) acting as electrical resistance (US-PS 3 903 453).
  • casting compounds 34 are known per se (e.g. DE-PS 1206209, US-PS 2 106 578) and can additionally also contain layers (not shown) acting as electrical resistance (US-PS 3 903 453).
  • connection bolt 36 On the connection side protrudes into this casting compound 34 the connection bolt 36 provided with an anchoring 35 (for example thread or cross knurling) on the combustion chamber side;
  • This connecting bolt 36 is made of unalloyed steel, rests with a collar 37 on the end face 38 of the electrical insulating body 17 and has a connecting thread 39 which protrudes from the electrical insulating body 17 on the connection side.
  • the metal body 31 which, depending on the embodiment of the spark plug 10, is between 8 and 20 mm long, not only is expensive material saved for central electrodes 26 consisting of or containing noble metal, but it is also avoided that casting compounds 34 in a region of the Spark plug 10 are arranged in which they melt due to the high operating temperatures occurring in the (not shown) combustion chamber of internal combustion engines and, as a result, may be adversely affected.
  • the length of the metal body 31 is chosen such that the casting compound 34 is always safely below the transformation range of the selected, electrically conductive Ver at all operating temperatures occurring in this area casting compound 34 remains.
  • the metal body 31 usually has a length between 8 and 20 mm and usually a diameter of the order of 1 to 2.5 mm.
  • the metal body 31 consists of the already mentioned Vacon 20 nickel alloy and has a diameter of 1.5 mm, a head diameter of 2 mm and a total length of 12 mm. While the head bore 24/1 of the electrical insulating body 17 has a diameter of 4.5 mm, the diameter of the foot bore 24/2 is 2.1 mm and the diameter of the guide part 24/2 'of the foot bore 24/2 is 1.53 mm.
  • the metal body 31 is inserted into the longitudinal bore 24 of the electrical insulating body 17 at room temperature and pressed against the connection-side end section of the center electrode 26 at approximately 100 N; this pressing pressure is sufficient to form the recess 29 in this area of the central electrode 26.
  • the connecting bolt 36 is also pressed into the casting compound 34, in which it is held securely and with good electrical contact as a result of its anchoring means 35.
  • the metal body 31 is only partially in close contact with the electrical insulating body 17, it has been found that the heat generated in the region of the center electrode 26 is sufficiently dissipated to the electrical insulating body 17 in all operating states.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP83106476A 1982-08-14 1983-07-02 Hochspannungszündkerze Expired EP0101547B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823230362 DE3230362A1 (de) 1982-08-14 1982-08-14 Hochspannungszuendkerze
DE3230362 1982-08-14

Publications (3)

Publication Number Publication Date
EP0101547A2 EP0101547A2 (de) 1984-02-29
EP0101547A3 EP0101547A3 (en) 1984-08-22
EP0101547B1 true EP0101547B1 (de) 1987-11-19

Family

ID=6170941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106476A Expired EP0101547B1 (de) 1982-08-14 1983-07-02 Hochspannungszündkerze

Country Status (5)

Country Link
EP (1) EP0101547B1 (enrdf_load_stackoverflow)
JP (1) JPS5949181A (enrdf_load_stackoverflow)
BR (1) BR8304350A (enrdf_load_stackoverflow)
DE (2) DE3230362A1 (enrdf_load_stackoverflow)
ES (1) ES524936A0 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431143B4 (de) * 1994-09-01 2004-09-23 Robert Bosch Gmbh Zündkerze für eine Brennkraftmaschine
DE10329269B4 (de) * 2003-06-30 2005-12-29 Robert Bosch Gmbh Zündkerze mit mindestens zwei Mittelelektroden

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6161390A (ja) * 1984-08-30 1986-03-29 日本特殊陶業株式会社 点火プラグ
DE19623989C2 (de) * 1996-06-15 1998-07-30 Bosch Gmbh Robert Zündkerze für eine Brennkraftmaschine
US6628051B1 (en) * 1999-07-29 2003-09-30 Robert Bosch Gmbh Spark plug for an internal combustion engine
RU2187869C1 (ru) * 2000-12-25 2002-08-20 Государственное унитарное предприятие Производственное объединение "Ульяновский машиностроительный завод" Способ изготовления сердечника свечи зажигания двигателя внутреннего сгорания
DE10156949B4 (de) * 2001-11-20 2004-03-04 Robert Bosch Gmbh Zündkerze
DE10257995B4 (de) 2002-04-09 2011-03-24 Robert Bosch Gmbh Zündkerze
US7443089B2 (en) 2006-06-16 2008-10-28 Federal Mogul World Wide, Inc. Spark plug with tapered fired-in suppressor seal
DE102010004345B4 (de) * 2010-01-11 2018-02-22 Viessmann Werke Gmbh & Co Kg Elektrode zur Flammenüberwachung an einem Heizungsbrenner
CN107790862B (zh) * 2017-10-20 2020-02-07 株洲湘火炬火花塞有限责任公司 火花塞侧电极焊接熔化量控制方法及其控制系统

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE199601C (enrdf_load_stackoverflow) *
US1361328A (en) * 1919-05-28 1920-12-07 Chauncey R Watson Spark-plug
US2072732A (en) * 1935-08-28 1937-03-02 Gen Electric Spark plug
GB801685A (en) * 1955-03-26 1958-09-17 Lodge Plugs Ltd Improvements in or relating to sparking plugs
US3509403A (en) * 1967-07-24 1970-04-28 Cecil J Krow Spark plug having a reversible inner electrode
JPS4922987A (enrdf_load_stackoverflow) * 1972-06-19 1974-02-28
DE2308915A1 (de) * 1973-02-23 1974-09-05 Otto Pickl Zuendkerze fuer otto-motoren
GB2054738A (en) * 1979-07-31 1981-02-18 Meadowbank Investments Ltd Improvements in Sparking Plugs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431143B4 (de) * 1994-09-01 2004-09-23 Robert Bosch Gmbh Zündkerze für eine Brennkraftmaschine
DE10329269B4 (de) * 2003-06-30 2005-12-29 Robert Bosch Gmbh Zündkerze mit mindestens zwei Mittelelektroden

Also Published As

Publication number Publication date
DE3374633D1 (en) 1987-12-23
BR8304350A (pt) 1984-03-20
ES8405206A1 (es) 1984-05-16
JPH0544151B2 (enrdf_load_stackoverflow) 1993-07-05
EP0101547A3 (en) 1984-08-22
ES524936A0 (es) 1984-05-16
JPS5949181A (ja) 1984-03-21
EP0101547A2 (de) 1984-02-29
DE3230362A1 (de) 1984-02-16

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