US3680538A - Spark plug for internal combustion engines - Google Patents

Spark plug for internal combustion engines Download PDF

Info

Publication number
US3680538A
US3680538A US12632A US3680538DA US3680538A US 3680538 A US3680538 A US 3680538A US 12632 A US12632 A US 12632A US 3680538D A US3680538D A US 3680538DA US 3680538 A US3680538 A US 3680538A
Authority
US
United States
Prior art keywords
spark plug
insulating body
heating
arrangement according
internal combustion
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 - Lifetime
Application number
US12632A
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English (en)
Inventor
Hans O Scherenberg
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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
Priority claimed from DE19691908971 external-priority patent/DE1908971C3/de
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Application granted granted Critical
Publication of US3680538A publication Critical patent/US3680538A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01T13/02—Details
    • H01T13/18—Means for heating, e.g. for drying

Definitions

  • ABSTRACT [51] Int. Cl. .,F02p l/00, F02b 53/00 A k 1 f par p ug or an Internal combusnon engme, espe [58] Field Of Search ..l23/l69, 128/809, 8.ll ciany for rotary piston internal combustion engines of f d trochoidal construction, in which the end of the insu- [56] Re erences Iating body surrounding the center electrode which UNITED STATES PATENTS faces ignition, is adapted to be heated to achieve selfcleaning under all operatingconditions.
  • the present invention relates to a spark plug for internal combustion engines, especially for rotary piston internal combustion engines of trochoidal construction, with an insulating body surrounding the center electrode and arranged in a spark plug housing.
  • a spark plug for a rotary piston internal combustion engine is so designed that the spark plug has a sufficient length of life and satisfies all requirements at high rotational speeds and in the full load range, its insulating body does not reach a temperature at lower rotational speeds and in the lower partial load range that suffices for a self-cleaning of the spark plug.
  • deposits form at the end of the insulating body on the ignition side thereof stemming from the fuel and from the lubricating oil which impair a proper and orderly functioning of the sparkplug.
  • a coating of lead stemming from the lead tetraethyl in the fuel forms at the insulating body which in a relatively short time leads to a shunt or leakage connection, causes misfirings and leads to a complete failure of the spark plug.
  • the present invention is predicated on the aim to eliminate the aforementioned shortcomings.
  • the underlying problems are solved according to the present invention in that means are provided at the spark plug in order to heat the end of the insulating body on the ignition side thereof.
  • the insulating body can be brought to a temperature during starting operations or during drives in city traffic at which a deposit of especially lead no longer takes place.
  • the spark plug remains fully operative in its function.
  • a glow or heating wire spiral may be arranged in the insulating body within the area of the ignition end, by means of which takes place the heating of the insulating body. Furthermore, switching means may be provided, by means of which the glow or heating wire spiral is energized or turned on in dependence on the rotational speed and on the load of the internal combustion engine at lower rotational speeds or at a high vacuum.
  • Another object of the present invention resides in a spark plug for rotary piston internal combustion engines which assures proper operation and self-cleaning under all driving conditions inclusive starting and city traffic.
  • a further object of the present invention resides in a spark plug for internal combustion engines, especially for rotary piston internal combustion engines of trochoidal construction which minimizes the danger of harmful deposits at its end exposed to ignition.
  • Still a further object of the present invention resides in a spark plug for internal combustion engines, especially for rotary piston internal combustion engines of trochoidal construction which excels by relatively long length of life.
  • the single FIGURE is a partial longitudinal crosssectional view through a spark plug in accordance with the present invention.
  • reference numeral 1 indicates the spark plug housing, within which is arranged the insulating body 2 that surrounds the center electrode 3.
  • a glow or heating wire spiral 5 is arranged in the ignition end 4 of the insulating body 2.
  • This heating wire spiral 5 which has several windings or turns, is connected, on the one hand, by means of the electrically conductive connecting rail 6 and the contact body 7 connected therewith by way of the metallic seal 8 for the insulating body 2 with the spark plug housing 1 and is connected, on the other, by way of the electrically conductive connecting rail 9 with a current source.
  • Switching means illustrated only schematically and generally designated by reference numeral 10 are provided, which are of any conventional construction, and by means of which the current supply to the heating wire spiral 5 is engaged automatically only when the internal combustion engine rotates at low rotational speeds or if a higher vacuum prevails in the suction pipe or intake manifold of the internal combustion engine, i.e., if the temperature at the spark plug drops below the self-cleaning temperature. With increasing rotational speed or decreasing vacuum, the switch means automatically interrupt the current supply to the heating wire spiral 5. Since such switching means are known, per se, in the prior art and form no part of the present invention, a detailed showing and description thereof is dispensed with.
  • a spark plug arrangement for internal combustion engines especially for engines of the type utilizing rotary pistons of trochoidal constructions; said arrangement comprising: spark plug housing means, an insulating body arranged in said housing means, a spark plug center electrode arranged in said insulating body and having an ignition end extending out of said insulating body, electrical heating means in said insulating body for heating the insulating body, air pressure detecting means for detecting engine air suction line pressure, engine speed detecting means for detecting the rotative speed of the engine, first switch means responsive to said air pressure detecting means so as to close when said pressure is in a predetermined range, second switch means responsive to said engine speed detecting means so as to close when said engine speed is in a predetermined range, and actuating means responsive to the closing of either of the first or second switch means for actuating the heating means, whereby sufficient heating of the spark plug is provided to assure self-cleaning thereof during partial load conditions.
  • a spark plug arrangement characterized in that said first switch means closes at a relatively high vacuum compared to normal engine operation and said second switch means closes at a relatively small rotational speed compared to normal engine operation.
  • a spark plug arrangement characterized in that said heating means includes a heating wire spiral arranged in and surrounded by the insulating body within the area of theignition end thereof, with said heating wire spiral disposed in said insulating body radially outwardly from its inner surface surrounding said central electrode and radially inwardly of the outer surfaces thereof to assure good heat transfer between said wire and said insulating body.
  • a spark plug arrangement characterized in that the heating means includes a heating wire spiral adapted to be connected with a voltage source by way of a metallic seal means between the insulating body and the housing means, and in that both said spark plug housing and said insulating body are provided with complementary inwardly and downwardly inclined shoulder surfaces with the metallic seal means disposed therebetween.

Landscapes

  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)
US12632A 1969-02-22 1970-02-19 Spark plug for internal combustion engines Expired - Lifetime US3680538A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691908971 DE1908971C3 (de) 1969-02-22 Zündkerze für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3680538A true US3680538A (en) 1972-08-01

Family

ID=5726040

Family Applications (1)

Application Number Title Priority Date Filing Date
US12632A Expired - Lifetime US3680538A (en) 1969-02-22 1970-02-19 Spark plug for internal combustion engines

Country Status (4)

Country Link
US (1) US3680538A (enExample)
JP (1) JPS4826091B1 (enExample)
FR (1) FR2033372A1 (enExample)
GB (1) GB1243156A (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800179A (en) * 1972-10-02 1974-03-26 Gen Motors Corp Self-cleaning spark plug
DE2417968A1 (de) * 1973-04-18 1974-11-07 Champion Spark Plug Co Zuendkerze mit gluehkerze
US5297519A (en) * 1992-02-19 1994-03-29 Syilvan Simons Method and apparatus for direct fuel injection in an internal combustion engine
US6060821A (en) * 1993-06-16 2000-05-09 Ngk Spark Plug Co., Ltd. Heater equipped spark plug
WO2010148457A1 (en) * 2009-06-26 2010-12-29 Orbital Australia Pty Limited Combustion of low vapour-pressure fuels in spark ignition engines
US20110139107A1 (en) * 2009-12-15 2011-06-16 John Burrows Spark ignition device for an internal combustion engine and central electrode assembly therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8601040D0 (en) * 1986-01-16 1986-02-19 Wilkinson N J Sparkplug

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE139632C (enExample) *
US1099365A (en) * 1914-01-21 1914-06-09 John C Henderson Combined spark-plug and vaporizer for internal-combustion engines.
US1290780A (en) * 1917-06-07 1919-01-07 Albert A Radtke Spark-plug.
US1364262A (en) * 1920-01-30 1921-01-04 Edward C Theis Spark-plug
US1430964A (en) * 1921-03-17 1922-10-03 Electric Heated Spark Plug Co Spark plug
US1432214A (en) * 1918-03-15 1922-10-17 Elmer A Sperry Fuel injecting and igniting means for oil engines
US1662724A (en) * 1926-07-23 1928-03-13 Charles E Nolte Spark plug
US1667960A (en) * 1925-04-01 1928-05-01 Jaech O Spark plug
FR732674A (fr) * 1932-03-05 1932-09-23 Bougie d'allumage avec système de réchauffage électrique
US3155085A (en) * 1963-04-29 1964-11-03 Curtiss Wright Corp Internal combustion engine with spark plug subject to high temperature operating conditions

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE139632C (enExample) *
US1099365A (en) * 1914-01-21 1914-06-09 John C Henderson Combined spark-plug and vaporizer for internal-combustion engines.
US1290780A (en) * 1917-06-07 1919-01-07 Albert A Radtke Spark-plug.
US1432214A (en) * 1918-03-15 1922-10-17 Elmer A Sperry Fuel injecting and igniting means for oil engines
US1364262A (en) * 1920-01-30 1921-01-04 Edward C Theis Spark-plug
US1430964A (en) * 1921-03-17 1922-10-03 Electric Heated Spark Plug Co Spark plug
US1667960A (en) * 1925-04-01 1928-05-01 Jaech O Spark plug
US1662724A (en) * 1926-07-23 1928-03-13 Charles E Nolte Spark plug
FR732674A (fr) * 1932-03-05 1932-09-23 Bougie d'allumage avec système de réchauffage électrique
US3155085A (en) * 1963-04-29 1964-11-03 Curtiss Wright Corp Internal combustion engine with spark plug subject to high temperature operating conditions

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800179A (en) * 1972-10-02 1974-03-26 Gen Motors Corp Self-cleaning spark plug
DE2417968A1 (de) * 1973-04-18 1974-11-07 Champion Spark Plug Co Zuendkerze mit gluehkerze
US3851637A (en) * 1973-04-18 1974-12-03 Champion Spark Plug Co Spark plug with glow plug
US5297519A (en) * 1992-02-19 1994-03-29 Syilvan Simons Method and apparatus for direct fuel injection in an internal combustion engine
US6060821A (en) * 1993-06-16 2000-05-09 Ngk Spark Plug Co., Ltd. Heater equipped spark plug
WO2010148457A1 (en) * 2009-06-26 2010-12-29 Orbital Australia Pty Limited Combustion of low vapour-pressure fuels in spark ignition engines
US20110139107A1 (en) * 2009-12-15 2011-06-16 John Burrows Spark ignition device for an internal combustion engine and central electrode assembly therefor
US8707922B2 (en) 2009-12-15 2014-04-29 Federal Mogul Ignition Company Spark ignition device for an internal combustion engine and central electrode assembly therefor
US10027092B2 (en) * 2009-12-15 2018-07-17 Federal-Mogul Ignition Company Spark ignition device for an internal combustion engine and central electrode assembly therefore

Also Published As

Publication number Publication date
DE1908971B2 (de) 1976-09-30
FR2033372A1 (enExample) 1970-12-04
JPS4826091B1 (enExample) 1973-08-06
GB1243156A (en) 1971-08-18
DE1908971A1 (de) 1970-09-24

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