US1852265A - Spark plug - Google Patents

Spark plug Download PDF

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Publication number
US1852265A
US1852265A US589677A US58967732A US1852265A US 1852265 A US1852265 A US 1852265A US 589677 A US589677 A US 589677A US 58967732 A US58967732 A US 58967732A US 1852265 A US1852265 A US 1852265A
Authority
US
United States
Prior art keywords
core
shell
carbon
restricted
tip
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
US589677A
Other languages
English (en)
Inventor
Otto C Rohde
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.)
Federal Mogul Ignition LLC
Original Assignee
Champion Spark Plug Co
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 Champion Spark Plug Co filed Critical Champion Spark Plug Co
Priority to US589677A priority Critical patent/US1852265A/en
Priority to FR733482D priority patent/FR733482A/fr
Priority to DEC46174D priority patent/DE587402C/de
Application granted granted Critical
Publication of US1852265A publication Critical patent/US1852265A/en
Priority to GB11583/32A priority patent/GB383875A/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
    • H01T13/20—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
    • 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
    • H01T13/16—Means for dissipating heat
    • 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

Definitions

  • This invention relates to a spark pl u" and more particularly to the construction 0 porcelain type core for a plug.
  • the invention has tor its pur ose to provide a spark plug with a core which will'have the various portions thereof maintained at proper working ill lit
  • Thepurpose of the present invention is to provide a core and shell properly related so as toguard against preignition'and to provide an ample length of core which will be normally free from either incrusted or deposited carbon and eliminate any region
  • Figure 1 is a longitudinal section through so a plug embodying one form of the invention and 1n whlch the inner end of the core extends beyond the surrounding shell;
  • Flgure 2 is a view similar to Fig. 1, but showing a beyond the inner end of the core.
  • the plug disclosed in Fig. 1 comprises a shell 10 of common type having an inner screw threaded end 11 ada ted to be screwed into,
  • the shell is provided with a slight? restricted end portion 12 andhas a shoul er 13 supporting a gasket 14 on whlch there rests a core 15.
  • the core is provided with a downwardly facing seating 75 surface 16 u on its shoulder 17, which seatmg surface 1s adapted to rest upon gasket 14.
  • the shoulder has an upwardly facing seating surface 18 against which a gasket 19 is pressed by a sleeve 20 screwed into the 80 upper portion of shell 10.
  • An electiode 21 asses through the core and extends at its lnner end 22 into sparking relation with an eaeciiirode 23 attached to the inner end of the s e
  • the construction as thus far described is common, and is merely indicated for the purpose of showing the setting of the improvement constituting the present invention.
  • Fig. 2 In the form shown there is a slightl stee er gradient 31 immediately above t e cy drical portion than there-is'just below the seat.
  • the construction shown in Fig. 2 is similar to that shown in Fi 1 and hke reference numerals are applie tolike parts, with a prime added for Fig. 2.
  • the chief distinction between the two figures is that in Fig. 2 portion -11' is extended downward beyond 15 the inner end of the core, or the core is shortened so that it does not extend as far as the shell. Under these circumstances it is preferable to have shoulder 27 above restricted portion 12 instead of within such restricted portion, as is preferable when the tip of the core extends below the shell.
  • cylindrical portion 29' In the construction shown in Fig. 2 cylindrical portion 29' is shortened, but it is still longer, than tapered portion28.
  • the diameter of the electrode 21 is substantially uniform and that there is no enlargement of this electrode where it extends below the core. Any enlargement of the extending inner end of the electrode, particularly if such enlargfment is in direct contact with the core, is hig ly objectionable because the electrode is normally of higher heat conductivity than the core and as a consequence such enlar ement of the inner end of the electrode resu ts in transmission of excessive heat to the portion of the. core in contact therewith.
  • the outward flaring portion 26 provides increasin space above t e tip for the carr ing off 0 heat and in this way reduces t e extreme temperature of the end ofthe tip and thereby decreases the danger of preignition. It has been found. preferable to maintain. this flare alon substantially conical lines in order to obtaln the desirable heat gradient.
  • Bulge 27 between flare portions 26 and 28 is somewhat rounded in order to prevent any sha edge, since a sharp projecting edge, articularly near the inner end of the core, is likely to become overheated and cause preignition.
  • the inwardly tapered portion 28 and the substantially cylindrical portion 29 provide a fairly long) surface which is normally hot enough to urn ofl' deposited carbon and not hot enough to be covered with incrusted carbon, and, therefore, maintains an effective insulating surface.
  • This reduced cylindrical o0 portion decreases the cross sectional area of the core through which heat may be carried off from the tip to the seating shoulder and thereby prevents the cooling of this portion of the core to such an extent that carbon is deposited thereon.
  • a spark plug core-having a downwardly facing seating surface the core between said seating surface and its lower end presenting one continuous insulating surface with only curvin changes in direction and consisting of an mtermediate substantially cylindrical restricted portion, a single enlargement between said portion and said lower end, and a portion enlarging from said restricted portion to said seatin surface, the heat transfer being v from said enlarged end portion through said restricted ortion and then through said enlarged seating portion whereby'a carbon free zone is provided at said restricted portion.
  • a spark plug core having a shoulder with a downward facing seating surface and an electrode embedded in and projecting from the lower end of the core, the cross section of the lower part of the embedded por-.
  • the electrode being as large as the cross section at any point of the projecting end of the electrode, the core presenting one continuous insulating surface with only curving changes of direction between said seating surface and its lower end, and the core having a single enlargement adjacent its lower end and a single restricted portion be tween said enlargement and said seating surface, whereby the heat transfer is from said enlarged end portion through said restricted portion and a carbon free zone is provided at said restricted portion.
  • a spark plug core having a downwardly facing seating surface and an electrode extending through the core and projecting from its lower end, said electrode being of substantially uniform cross section from its lower end to at least as high as said seating surface, the core between said seating surface and its lower end presenting one continuous insulating surface with only curving changes in direction and consisting of an intermediate substantially cylindrical portion, a single enlargement between said portion and said lower end, and a portion enlarging from said cylindrical portion to said seating surface, the heat transfer from said enlarged end portion through said cylindrical portion and then through said enlarged seating portion whereby a carbon free zone is provided at said cylindrical portion.
  • a spark plug core having a downwardly seating shoulder and a tip, said core flaring from its tip to a bulge, tapering from the bulge to a substantially cylindrical portion, and flaring from the upperend of said cylindrical portion to its seat, the first said flare being at least as long as said cylindrical por-' tion and said taper being shorter than said cylindrical portion, whereby the heat transfer is from said enlarged end portion through said cylindrical portion and a carbon free zone is provided at said cylindrical portion.
  • a spark plug comprising a shell havin a seat for a core and a restricted inner en and a core with a shoulder having a downwardly facing surface cooperating with said seat, the core projecting inward from said seat farther than the shell and flaring outward from its tip substantially conically to a bulge within but out of contact with the restricted portion of said shell, tapering from the bulge to a substantially cylindrical portion and flaring from the upper end of the cylindrical portion to said downwardly facing surface, the distance from the bulge to the cylindrical portion being substantially less than that from the cylindrical portion to the seat.
  • spark plug comprising ashell having a seat for a core and a restricted inner end, and a core with a shoulder having a downwardly facing surface cooperating with said seat, the core projecting inward from said seat to a tip within said restricted portion of the shell, the core flaring upward from the tip to a bulge located above the restricted portion of the shell, tapering from the bulge to a substantially cylindrical portion and flaring from the upper end of the cylindrical portion to said downwardly facing surface, the heat transfer being from said enlarged end portion through said cylindrical portion and then through said enlarged seating portion whereby a carbon free zone is provided at said cylindrical portion.
  • a spark plug comprising a core having a seating surface and projecting inward from said surface to a tip, and an electrode embedded in the core and projecting from said tip, the cross section of the lower end of the embedded portion and the projecting portion of the electrode being substantially uniform, the core flaring outward from its tip to carry off the heat from the tip and minimize preignition, having a restricted portion of substantial length above said flaring portion to retain sufficient heat to eliminate deposited carbon, flaring from the upper end of said restricted portion to said seating surface, presentin an insulating surface from seat to tip to avoid disturbance of heat distribution, and changing in contour gradually to avoid excessive heat gradients.

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  • Spark Plugs (AREA)
US589677A 1932-01-29 1932-01-29 Spark plug Expired - Lifetime US1852265A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US589677A US1852265A (en) 1932-01-29 1932-01-29 Spark plug
FR733482D FR733482A (fr) 1932-01-29 1932-03-14 Bougie d'allumage
DEC46174D DE587402C (de) 1932-01-29 1932-03-15 Zuendkerze
GB11583/32A GB383875A (en) 1932-01-29 1932-04-22 Improvement in spark plugs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US589677A US1852265A (en) 1932-01-29 1932-01-29 Spark plug

Publications (1)

Publication Number Publication Date
US1852265A true US1852265A (en) 1932-04-05

Family

ID=24359024

Family Applications (1)

Application Number Title Priority Date Filing Date
US589677A Expired - Lifetime US1852265A (en) 1932-01-29 1932-01-29 Spark plug

Country Status (4)

Country Link
US (1) US1852265A (fr)
DE (1) DE587402C (fr)
FR (1) FR733482A (fr)
GB (1) GB383875A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037142A (en) * 1956-03-15 1962-05-29 Radiologie Cie Gle X-ray generator tubes
US8643263B2 (en) 2011-12-09 2014-02-04 Federal-Mogul Corporation Insulator strength by seat geometry
US9041273B2 (en) 2010-12-14 2015-05-26 Federal-Mogul Ignition Company Corona igniter having shaped insulator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5625194Y2 (fr) * 1978-10-17 1981-06-13
DE102010029420A1 (de) * 2010-05-27 2011-12-01 Robert Bosch Gmbh Laserinduzierte Fremdzündung für eine Brennkraftmaschine
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037142A (en) * 1956-03-15 1962-05-29 Radiologie Cie Gle X-ray generator tubes
US9041273B2 (en) 2010-12-14 2015-05-26 Federal-Mogul Ignition Company Corona igniter having shaped insulator
US8643263B2 (en) 2011-12-09 2014-02-04 Federal-Mogul Corporation Insulator strength by seat geometry

Also Published As

Publication number Publication date
GB383875A (en) 1932-11-24
DE587402C (de) 1933-11-03
FR733482A (fr) 1932-10-06

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