EP0073939A1 - Bougie d'allumage pour haute tension - Google Patents

Bougie d'allumage pour haute tension Download PDF

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Publication number
EP0073939A1
EP0073939A1 EP82107130A EP82107130A EP0073939A1 EP 0073939 A1 EP0073939 A1 EP 0073939A1 EP 82107130 A EP82107130 A EP 82107130A EP 82107130 A EP82107130 A EP 82107130A EP 0073939 A1 EP0073939 A1 EP 0073939A1
Authority
EP
European Patent Office
Prior art keywords
insulating body
spark plug
millimeters
combustion chamber
electrode
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.)
Withdrawn
Application number
EP82107130A
Other languages
German (de)
English (en)
Inventor
Walter Benedikt
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 EP0073939A1 publication Critical patent/EP0073939A1/fr
Withdrawn legal-status Critical Current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
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
    • 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 invention relates to a high-voltage spark plug according to the preamble of the main claim.
  • a spark plug which is already known from US Pat. No. 2,265,352
  • such spark plugs have an unsatisfactory ignition behavior, a relatively high ignition voltage requirement and, because of their multilayer structure in the center electrode area, they are both material-intensive and labor-intensive.
  • the high-voltage spark plug according to the invention with the characterizing features of the main claim has the advantage that, due to the design of its ignition area (central electrode, insulating body, ground electrode), it has a favorable ignition behavior in all operating states of the internal combustion engine, has a normal ignition voltage requirement, does not lead to sliding spark discharges and therefore does not Misfiring tends and is well suited for industrial production in terms of both production technology and cost; it should also be mentioned that this spark plug has a relatively long service life, does not have any problems with regard to its free-burning temperature when the internal combustion engine is cold started and when it is pushed, and also does not tend to glow ignition under load of the internal combustion engine.
  • the measures listed in the subclaims permit advantageous developments and improvements of the spark plug specified in the main claim.
  • the spark plug according to the invention is particularly advantageous when noble metals are used for the central electrode: the need for expensive noble metals can be considerably reduced if a thin noble metal nail, ceramic with precious metals or a conductor track containing precious metals is used as the central electrode.
  • FIG. 1 shows a partial section through the enlarged ignition area of a spark plug
  • FIG. 2 shows a partial section through the spark plug according to FIG. 1 along the section line A / B
  • FIG. 3 shows a further enlarged section through the combustion chamber-side end section of the insulator and central electrode of the spark plug according to FIGS 1 and 2 (noble metal nail as center electrode)
  • FIG. 4 shows an even larger enlarged, combustion chamber-side end section of the spark plug insulator with the principle of an advantageous possibility for inserting a nail-shaped noble metal electrode
  • FIG. 5 shows another embodiment of the spark plug area shown in FIG. 3 (noble metal nail with hollow shaft as the center electrode)
  • FIG. 6 shows an additional embodiment of a combustion chamber-side end section of a spark plug insulator with a center electrode (center electrode introduced as a precious metal suspension).
  • the combustion chamber-side section of the spark plug 10 according to the invention shown in FIGS. 1 and 2 has a metal housing 11 which has a screw thread 12 on its outside and a key hexagon no longer recorded in FIGS. 1 and 2 for installing the spark plug 10 in an engine head (not shown) having;
  • a metallic sealing ring 13 is provided at the connection-side end of the screw thread 12.
  • the metal housing 11 includes with its through hole 14 in a known manner a rotationally symmetrical insulating body 15 and carries at its combustion chamber end a wire-shaped ground electrode 16.
  • the insulating body 15 which consists for example essentially of aluminum oxide, known by flanging and heat shrinking - optionally with the interposition of sealing rings 17 - in the Housing through bore 14 is fixed sealing, has a step-shaped longitudinal bore 18; the insulating body 15 can also be sealed in the megall housing 11 by cementing or the like.
  • the connection-side area of this insulating body - longitudinal bore 18 has a larger diameter than the areas adjoining the combustion chamber - accommodates the section of a metallic connecting bolt 19 on the combustion chamber side and is designated 18/1.
  • the region of the insulating body longitudinal bore 18 adjoining the combustion chamber contains an electrically conductive glass melt flow 20 in a known manner - but can additionally also contain resistance elements - and is designated by 18/2.
  • the area on the combustion chamber side has the smallest diameter of this insulating body longitudinal bore 18, serves to receive the center electrode 21 and is designated 18/3.
  • the longitudinal bore region 18/2 adjoining the combustion chamber has a diameter of 2 millimeters, tapers on the combustion chamber side by approximately 0.5 millimeters and merges via a shoulder 22 into the combustion chamber side region 18/3 of the insulating body longitudinal bore 18; the combustion chamber-side area 18/3 of the insulating body longitudinal bore 18 has a diameter of about 0.3 millimeters.
  • the center electrode 21, which consists of a noble metal - preferably a platinum metal - is composed (see FIG. 3) of a shaft 23 and a flat head 24 and projects with the free end section of the shaft 23 just like the end section of the connecting bolt 19 in the combustion chamber the electrically conductive glass melt flow 20; a suitable glass melt flow 20 is known, for example, from US Pat. No.
  • the center electrode head 24 has a diameter of 0.5 millimeters and is only about 0.1 millimeters high.
  • the insulating body end face 25 is essentially flat and has a diameter of 2 millimeters; Depending on the application, the center electrode head 24 can also be made larger, but in no case does it exceed the maximum diameter of the insulating body end face 25 of 4 millimeters.
  • the diameter of the insulating face 25 is mostly between 1.5 and 3 millimeters, but preferably between 2 and 2.5 millimeters.
  • the combustion chamber-side end face 25 of the insulating body 15 merges into a flat groove 26 which is arranged coaxially to the end face 25 and which forms transition edges 27 and 28 on the end section of the insulating body 15 on the combustion chamber side.
  • the amount of the insulating body end face 25 up to the v transition edge 28 is 1.5 millimeters, but may be from 0.8 to 3.0 millimeters; the maximum depth of the groove 26 measured by an imaginary line between the transition edges 27 and 28 is 0.8 millimeters, however, is preferably in the range of 0.4 mm.
  • the diameter of the insulating body 15 in the area of the transition edge 28 depends on the application of the spark plug 10 and is 4.5 millimeters in the present example; the diameter in this area of the insulating body 15 can be between 3.0 and 7.0 millimeters.
  • a frustoconical transition from the edge 27 to the edge 28 can also be present in the borderline case.
  • the center electrode 21 is preferably installed with its shaft 23 in the combustion chamber side area 18/3 of the insulating body longitudinal bore 18 such that it is inserted into the longitudinal bore area 18/3 of the presintered insulating body 15 and is sintered together with it. As can be seen from FIG.
  • the insertion of the center electrode 21 into the combustion chamber-side area 18/3 of the insulating body longitudinal bore 18 is to be made rational in that the cross section of a wire 29 made of noble metal by means of a hammering or rolling process at an appropriate distance with annular Notches 30 are provided, which simultaneously form a bulge forming the central electrode head 24 and a taper of the central electrode shaft 23;
  • the center electrodes 21 adjoining the head 24 of this center electrode 21 can be broken off or the like. be separated from the front center electrode 21.
  • the central electrode head 24 By compressing the central electrode head 24 protruding beyond the end face 25 of the insulating body 15 on the combustion chamber side, the central electrode head 24 can be reshaped or enlarged in diameter; there is also the possibility to heat the preformed center electrode head 24 before upsetting, possibly even up to a temperature which brings it in the range from pasty to molten.
  • the operations described above are easy to automate in industrial production.
  • the center electrode head 24 can be made larger by connecting it with additional electrode material; Additional electrode material can be attached to the preformed central electrode head 24 by welding a sheet (not shown) consisting of electrode material to the central electrode head 24, or by having the noble metal on the end face 25 as a suspension or by means of electrolysis (melt flow electrolysis, galvanic electrolysis) is applied.
  • the height of the finished center electrode head 24 is preferably 0.1 millimeters, but can - depending on the application - be up to about one millimeter thick.
  • the center electrode head 24 is at a distance of 0.8 millimeters from the end section of the ground electrode 16, which is wider than the diameter of the combustion chamber end face 25 of the insulating body 15; in the present example, the ground electrode 16 has a width of 2.5 millimeters.
  • the width of the ground electrode 16 is to be adapted to the application of the spark plug 10.
  • This ground electrode 16 is made in a known manner from a corrosion-resistant metal and is usually attached to the spark plug housing 11 by welding.
  • a further embodiment (not shown) for producing a suitable center electrode can be carried out in such a way that an electrically conductive surface is applied to an electrically non-conductive rod (for example made of platinum), and that this type of center electrode instead of a metallic center electrode 21, 21 'in the Insulating body 15 is introduced (see DE-OS 30 38 720).
  • Electrode 21 can also be used electrically conductive, ceramic mass (see DE-PS 405 342 or as an example a mixture of 75% A1 2 0 3 , 20% Cu 2 0 and 5% Cr 2 0 3 ) or a center electrode 21 from one Cermet (eg consisting of 60% Al 2 0 3 and 40% platinum), if necessary, another metal such as palladium can also be added to such a cermet (see DE-OS 27 29 099).
  • Cermet eg consisting of 60% Al 2 0 3 and 40% platinum
  • another metal such as palladium can also be added to such a cermet (see DE-OS 27 29 099).
  • ceramic-containing center electrodes 21 have the advantage that they can be better adapted to the ceramic of the insulating body 15 with their thermal expansion coefficient than metallic center electrodes 21.
  • the center electrodes 21, .. described so far were sintered into the insulating body 15, 15 ', they Alternatively, however, they can also be fixed in the finished sintered insulating body 15, 15 'in a known manner by means of glass or putty.
  • FIG. 6 shows a further variant for the installation of a center electrode 21 "in an insulating body 15":
  • This center electrode 21 " is produced by placing a noble metal suspension (preferably in the area 18/3" of the insulating body longitudinal bore 18 in the combustion chamber a platinum suspension) is introduced and sintered; if the precious metal suspension is dripped into the insulating body 15 "which has not yet been sintered, the finished sintering is carried out together with the finished sintering of the insulating body 15".
  • a noble metal suspension preferably in the area 18/3" of the insulating body longitudinal bore 18 in the combustion chamber a platinum suspension
  • the precious metal suspension can only be introduced into the combustion chamber-side area 18/3 "of the insulating body longitudinal bore 18 by any known method after the insulating body 15" has already been sintered; in this case the center electrode 21 "requires an additional sintering process to complete it.
  • This last-described method is particularly suitable for producing spark plugs 10 of this type if the center electrode 21 "is to be provided with a relatively large-area head 24", since such a head 24 "can then be applied with the same noble metal suspension in the same operation
  • an enlargement of their center electrode head can also be produced by means of such a noble metal suspension, or that the center electrode head can also be enlarged by applying an electrically conductive one Layer can be carried out by means of melt flow electrolysis or galvanic electrolysis or - if a cermet is used - even by welding on a noble metal sheet -
  • a central electrode 21 with a head 24 which is relatively large in diameter and possibly up to 1 millimeter thicker brings the additional advantage of long service life.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP82107130A 1981-08-20 1982-08-06 Bougie d'allumage pour haute tension Withdrawn EP0073939A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813132903 DE3132903A1 (de) 1981-08-20 1981-08-20 Hochspannungszuendkerze
DE3132903 1981-08-20

Publications (1)

Publication Number Publication Date
EP0073939A1 true EP0073939A1 (fr) 1983-03-16

Family

ID=6139708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107130A Withdrawn EP0073939A1 (fr) 1981-08-20 1982-08-06 Bougie d'allumage pour haute tension

Country Status (4)

Country Link
EP (1) EP0073939A1 (fr)
JP (1) JPS5840789A (fr)
BR (1) BR8204845A (fr)
DE (1) DE3132903A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0845167B1 (fr) * 1996-06-15 2003-01-15 Robert Bosch Gmbh Bougie d'allumage pour moteur a combustion interne

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235379A (ja) * 1984-05-07 1985-11-22 日本特殊陶業株式会社 小型点火プラグ
JPS6161390A (ja) * 1984-08-30 1986-03-29 日本特殊陶業株式会社 点火プラグ
JPS61253785A (ja) * 1985-05-04 1986-11-11 日本特殊陶業株式会社 点火プラグ
JPS625581A (ja) * 1985-07-01 1987-01-12 日本特殊陶業株式会社 小型点火プラグ
JPS62105385A (ja) * 1985-10-31 1987-05-15 日本特殊陶業株式会社 点火プラグ
CN109539305B (zh) * 2019-01-15 2023-10-10 佛山市科皓燃烧设备制造有限公司 一种应用于工业燃烧器的新型自冷却电极

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB188874A (en) * 1921-10-26 1922-11-23 William Henry Shute Improvements in or relating to sparking plugs of internal combustion engines
US1646318A (en) * 1926-10-27 1927-10-18 Schneider Edward Albert Spark plug
GB505085A (en) * 1937-10-28 1939-04-28 John Gabler Improvements in or relating to sparking plugs
US2301686A (en) * 1940-02-08 1942-11-10 James A Doran Spark plug
GB559805A (en) * 1943-01-28 1944-03-06 Ac Sphinx Sparking Plug Compan The manufacture of spark plugs
GB801685A (en) * 1955-03-26 1958-09-17 Lodge Plugs Ltd Improvements in or relating to sparking plugs
DE2444454A1 (de) * 1973-09-21 1975-04-03 Lectra Holding S A Soc Zuendkerze, insbesondere fuer verbrennungsmotoren

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB188874A (en) * 1921-10-26 1922-11-23 William Henry Shute Improvements in or relating to sparking plugs of internal combustion engines
US1646318A (en) * 1926-10-27 1927-10-18 Schneider Edward Albert Spark plug
GB505085A (en) * 1937-10-28 1939-04-28 John Gabler Improvements in or relating to sparking plugs
US2301686A (en) * 1940-02-08 1942-11-10 James A Doran Spark plug
GB559805A (en) * 1943-01-28 1944-03-06 Ac Sphinx Sparking Plug Compan The manufacture of spark plugs
GB801685A (en) * 1955-03-26 1958-09-17 Lodge Plugs Ltd Improvements in or relating to sparking plugs
DE2444454A1 (de) * 1973-09-21 1975-04-03 Lectra Holding S A Soc Zuendkerze, insbesondere fuer verbrennungsmotoren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0845167B1 (fr) * 1996-06-15 2003-01-15 Robert Bosch Gmbh Bougie d'allumage pour moteur a combustion interne

Also Published As

Publication number Publication date
DE3132903A1 (de) 1983-03-03
BR8204845A (pt) 1983-08-02
JPS5840789A (ja) 1983-03-09

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Withdrawal date: 19830128

RIN1 Information on inventor provided before grant (corrected)

Inventor name: POLLNER, RUDOLF

Inventor name: BENEDIKT, WALTER

Inventor name: STEINKE, LEO

Inventor name: SCHAFFRIN, CHRISTIAN, DR. DIPL.-ING.