US3890519A - Spark discharge plugs - Google Patents

Spark discharge plugs Download PDF

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Publication number
US3890519A
US3890519A US365154A US36515473A US3890519A US 3890519 A US3890519 A US 3890519A US 365154 A US365154 A US 365154A US 36515473 A US36515473 A US 36515473A US 3890519 A US3890519 A US 3890519A
Authority
US
United States
Prior art keywords
spark discharge
insulator
electrode
discharge plug
air gap
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
US365154A
Other languages
English (en)
Inventor
Henry James Chafer
Stuart Graham
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Application granted granted Critical
Publication of US3890519A publication Critical patent/US3890519A/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
    • H01T13/52—Sparking plugs characterised by a discharge along a surface
    • 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
    • H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement

Definitions

  • a spark discharge plug comprises an outer annular electrode and an inner electrode, the two electrodes in use being connected to a source of electric supply, an annular air gap intermediate the electrodes and a dielectric material having a high permittivity interposed between one of the electrodes and the air gap.
  • a known form of spark discharge plug comprises an outer annular electrode and an inner electrode, the two electrodes in use being connected to a source of electric supply, and air gap surrounding the inner electrode and an annular body of semi-conductive material interposed between the air gap and the outer electrode.
  • the object of the invention is to provide a spark discharge plug in a simple and convenient form.
  • a spark discharge plug of the kind specified comprises an annular outer electrode, an inner electrode, an annular air gap intermediate the electrodes and a dielectric material having a permittivity interposed between one of the electrodes and the air gap, said dielectric material having a high resistance to corrosion.
  • a hollow body formed from metal and having a hollow cylindrical extension 11 at the end of which is mounted an annular electrode 12, the electrode having a tapered internal surface.
  • the body 10 defines an inclined step 13 against which is located in sealing relationship, a complementary surface formed on a flange 14 on a hollow cylindrical insulator 15 having a skirt 16 extending within the body 10.
  • the insulator is retained in position by a sleeve member 17 and this in turn is retained by means ofa rolled over portion of the body 10.
  • the insulator is formed for example, from alumina and a further skirt is provided which extends within the sleeve member.
  • This skirt accommodates, in use, a high voltage lead the core of which is connected to a central electrode 18 of rod like form and having a head 19 which is brazed to the insulator. Moreover, interposed between the sleeve member 17 and the flange is a compression seal which can accommodate differences in the thermal expansions of the individual materials.
  • the central electrode 18 has a tip 20 which extends flush with the electrode 12 and is formed from silicided tungsten.
  • a further insulator 21 this is formed from material having a high permittivity, at least 50, and which is also resistant to corrosion by the hot gases resulting from the combustion of the air/fuel mixture within the combustion chamber.
  • insulator 21 has an end portion having tapered surface which co-operates with the tapered surface of the electrode 12, the insulator being actuated to maintain the tapered surfaces in contact with each other.
  • the insulator 21 has an enlargement which cooperates as a sliding fit, with the bore in the body 10.
  • the electrode 18 extends with a small annular clearance within a bore formed in the insulator 21. This is particularly the case at the end of the plug. Moreover, by virtue of the tapered surfaces the thickness of the insulator 21 at the end of the plug is less than at any other position.
  • the fact that the insulator is formed from material having a high permittivity means that the potential across the air gap between the electrode tip 20 and the insulator 21 is greater than the potential across the insulator.
  • One material which is particularly suited for the insulator 21 is calcium titanate this material having a value of permittivity of the order of 100.
  • One such material is that supplied by Stealite and Porcelain Products Limited as TEMPRADES NISOO. This permittivity of at l Mc/s and 20c.
  • a spark discharge plug for igniting and air/fuel mixture in an internal combustion engine and comprising an annular outer electrode, and inner electrode, an annular air gap intermediate the electrodes and an a nular body of dielectric material having a permittvity of at least 50 interposed between one of the electrodes and the air gap, said body acting to ensure that when the electrodes are connected to a source of electric supply a substantial proportion of the voltage of the electric supply appears across the air gap.
  • a spark discharge plug as claimed in claim 1 in which the air gap is positioned adjacent the inner electrode.
  • a spark discharge plug as claimed in claim 1 comprising a hollow metallic body having at one end said outer electrode, the internal surface of said outer electrode tapering inwardly towards said end of the body, a hollow insulator within the body and having an outer end surface complementary to said tapered portion of the body, means urging said surface of said insulator into engagement with the tapered portion of the body and an electrode extending with clearance through said insulator, said insulator being formed from said dielectric material and said electrode defining said inner electrode.
  • a spark discharge plug as claimed in claim 4 in which said inner electrode is mounted on a further insulator carried within the body, said further insulator having a skirt portion surrounding said first mentioned insulator and a flange having a surface in sealing engagement with the body.
  • a spark discharge plug as claimed in claim 5 including a sleeve member for retaining said further insulator in position within the body said sleeve member being retained in the body by a rolled over portion of the body.

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  • Spark Plugs (AREA)
US365154A 1972-06-08 1973-05-30 Spark discharge plugs Expired - Lifetime US3890519A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2669272A GB1438503A (en) 1972-06-08 1972-06-08 Spark discharge plugs

Publications (1)

Publication Number Publication Date
US3890519A true US3890519A (en) 1975-06-17

Family

ID=10247695

Family Applications (1)

Application Number Title Priority Date Filing Date
US365154A Expired - Lifetime US3890519A (en) 1972-06-08 1973-05-30 Spark discharge plugs

Country Status (7)

Country Link
US (1) US3890519A (de)
JP (1) JPS4962828A (de)
CA (1) CA979764A (de)
DE (1) DE2329273A1 (de)
FR (1) FR2188333B1 (de)
GB (1) GB1438503A (de)
IT (1) IT985322B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4155093A (en) * 1977-08-12 1979-05-15 Dennison Manufacturing Company Method and apparatus for generating charged particles
US4374450A (en) * 1979-06-04 1983-02-22 The Bendix Corporation Method of making an igniter plug with nickel coating on center electrode
DE3404081A1 (de) * 1983-03-14 1984-09-20 Champion Spark Plug Co., Toledo, Ohio Zuendkerze
US4963784A (en) * 1988-05-18 1990-10-16 Beru Reprecht GmbH & Co. KB Spark plug having combined surface and air gaps

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3149676A1 (de) * 1981-04-23 1982-11-18 Champion Spark Plug Co., Toledo, Ohio Zuendvorrichtung
DE3533123A1 (de) * 1985-09-17 1987-03-26 Bosch Gmbh Robert Zuendkerze mit gleitfunkenstrecke
DE3533124A1 (de) * 1985-09-17 1987-03-26 Bosch Gmbh Robert Zuendkerze mit gleitfunkenstrecke
DE3616668A1 (de) * 1986-05-16 1987-11-19 Bosch Gmbh Robert Zuendkerze mit gleitfunkenstrecke

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2025914A (en) * 1932-12-29 1935-12-31 Lewis J Tetlow Spark plug
US2833950A (en) * 1955-11-07 1958-05-06 Jr Arthur C Hastings Spark plug
US2926275A (en) * 1960-02-23 Pgras
US3488556A (en) * 1967-12-01 1970-01-06 Gen Motors Corp Spark plug with main and teaser gaps in parallel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE883077C (de) * 1944-11-25 1953-07-13 Bosch Gmbh Robert Gleitfunkenzuendkerze
FR1149914A (fr) * 1956-04-17 1958-01-03 Renault Bougie d'allumage par étincelles glissantes
FR1307681A (fr) * 1961-12-07 1962-10-26 Lodge Plugs Ltd Perfectionnements aux systèmes d'allumage électrique
JPS4113607Y1 (de) * 1965-10-04 1966-06-27

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926275A (en) * 1960-02-23 Pgras
US2025914A (en) * 1932-12-29 1935-12-31 Lewis J Tetlow Spark plug
US2833950A (en) * 1955-11-07 1958-05-06 Jr Arthur C Hastings Spark plug
US3488556A (en) * 1967-12-01 1970-01-06 Gen Motors Corp Spark plug with main and teaser gaps in parallel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4155093A (en) * 1977-08-12 1979-05-15 Dennison Manufacturing Company Method and apparatus for generating charged particles
US4374450A (en) * 1979-06-04 1983-02-22 The Bendix Corporation Method of making an igniter plug with nickel coating on center electrode
DE3404081A1 (de) * 1983-03-14 1984-09-20 Champion Spark Plug Co., Toledo, Ohio Zuendkerze
DE3404081C2 (de) * 1983-03-14 1992-08-20 Champion Spark Plug Co., Toledo, Ohio, Us
US4963784A (en) * 1988-05-18 1990-10-16 Beru Reprecht GmbH & Co. KB Spark plug having combined surface and air gaps

Also Published As

Publication number Publication date
GB1438503A (en) 1976-06-09
FR2188333A1 (de) 1974-01-18
CA979764A (en) 1975-12-16
DE2329273A1 (de) 1973-12-20
JPS4962828A (de) 1974-06-18
FR2188333B1 (de) 1977-02-11
IT985322B (it) 1974-11-30

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