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WO2006014840A2 - Bougie a etincelles multiples - Google Patents

Bougie a etincelles multiples Download PDF

Info

Publication number
WO2006014840A2
WO2006014840A2 PCT/US2005/026208 US2005026208W WO2006014840A2 WO 2006014840 A2 WO2006014840 A2 WO 2006014840A2 US 2005026208 W US2005026208 W US 2005026208W WO 2006014840 A2 WO2006014840 A2 WO 2006014840A2
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
spark plug
insulative body
electrodes
ground
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.)
Ceased
Application number
PCT/US2005/026208
Other languages
English (en)
Other versions
WO2006014840A3 (fr
Inventor
Abdul S. Assad
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.)
MTD Products Inc
Original Assignee
MTD Products Inc
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 MTD Products Inc filed Critical MTD Products Inc
Publication of WO2006014840A2 publication Critical patent/WO2006014840A2/fr
Publication of WO2006014840A3 publication Critical patent/WO2006014840A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H01T13/46—Sparking plugs having two or more spark gaps
    • H01T13/462—Sparking plugs having two or more spark gaps in series connection
    • 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
    • H01T13/46—Sparking plugs having two or more spark gaps

Definitions

  • This invention relates to a sparkplug for an internal combustion engine, and more particularly, to a sparkplug with multi-sparking electrodes.
  • sparkplugs utilize a single centrally located positive electrode that discharges the high voltage to a ground electrode.
  • Certain plugs may contain two, three or four ground electrodes evenly spaced away from the center positive electrode.
  • the centrally located positive electrode will often only have enough energy to jump the gap to one of the ground electrode (i.e., the path to the least resistance).
  • sparks may contact the second, or third and forth ground electrode.
  • the spark source is still located at the center of the plug. The combustion generated from such a plug has to radially travel to the perimeter of the cylinder and expand axially in the piston direction.
  • spark plug that consistently and reliably forms multiple sparks with each firing sequence of the spark plug. It is also desired that the spark plug be manufacturable in a cost effective manner.
  • the invention pertains to a spark plug that substantially simultaneously produces a plurality of sparks in a combustion chamber of an internal combustion engine.
  • the spark plug includes an insulative plug body having and a combustion chamber facing surface.
  • the spark plug also includes a main electrode, a ground, and at least one intermediate electrode in series with the main electrode and said ground.
  • the intermediate electrode(s) each have first and second ends and a mid portion in between the ends.
  • Each intermediate electrode is partially embedded within the insulative body such that the first and second ends of the electrode extend from the combustion chamber facing surface of the insulative body and said mid portion is embedded in the insulative body.
  • a first gap is formed between the main electrode and the first end of the first of the at least one intermediate electrodes and a final gap is formed between a second end of the final one of the at least one intermediate electrodes and the ground electrode so that high voltage power jumps across the plurality of gaps to form a plurality of sparks.
  • the intermediate electrodes are generally U-shaped electrodes.
  • the invention also pertains to a method for manufacturing a spark plug that substantially simultaneously produces a plurality of sparks in a combustion chamber of an internal combustion engine.
  • the method includes forming an insulative plug body having a combustion chamber facing surface.
  • the method also includes inserting a main electrode through the insulative body and affixing a ground to the insulative body.
  • the method further includes inserting at least one intermediate electrode into the insulative body in series with the main electrode and said ground.
  • Each intermediate electrode has first and second ends and a mid portion in between said ends.
  • the intermediate electrodes are inserted such that they are partially embedded within the insulative body such that the first and second ends of said electrode extend from the combustion chamber facing surface of the insulative body and said mid portion is embedded in the insulative body such that a first gap is formed between the main electrode and the first end of the first of the at least one intermediate electrodes and a final gap is formed between a second end of the final one of the at least one intermediate electrodes and the ground electrode so that high voltage power jumps across the plurality of gaps to form a plurality of sparks.
  • Figure 1 illustrates a spark plug according to one aspect of the invention
  • Figure 2 illustrates partially cut away view of the spark plug of Figure
  • Figure 3 illustrates the electrodes being inserted in the spark plug of
  • Figure 4 illustrates partially cut away view of the spark plug of Figure
  • FIG 1 shows a combustion chamber end of a spark plug 10 having an insulative body 40.
  • the spark plug 10 desirably includes a conductive outer housing (not shown) that is provided with a screw thread (not shown) and a hexagon drive (now shown).
  • the spark plug 10 is screwed into a mating thread in the cylinder head of an internal combustion engine so that spark plug 10 projects into a combustion chamber of a cylinder of the internal combustion engine.
  • the spark plug 10 may be connected with the support structure of an internal combustion engine (not shown).
  • the spark plug 10 may be provided with an engagement portion (not shown) for facilitating engagement of the spark plug 10 with a tool such as a wrench for threadily engaging the spark plug 10 with the cylinder head.
  • a tool such as a wrench for threadily engaging the spark plug 10 with the cylinder head.
  • the spark plug 10 utilizes a plurality of electrodes positioned in series with spark-forming gaps formed between adjacent electrodes.
  • the spark plug 10 includes a first main electrode 20, two intermediate electrodes 22, 24 and a final ground 26.
  • the ground 26 may comprise or be connected to the conductive outer shell of the spark plug 10.
  • the insulative body 40 electrically insulates the electrode 20, 22, 24 from having direct electrical contact with the conductive outer housing.
  • more or fewer intermediate electrodes may be included using sound engineering judgment depending on the desired number of sparks to be produced without departing from the scope of the invention.
  • a first gap 30 is formed between the main electrode 20 and a first end
  • the high voltage power jumps a plurality of gaps 30, 32 through the series of electrodes 20, 22, 24 before jumping to ground at the final gap 34, substantially simultaneously forming separate sparks at each gap. It is contemplated that such a series of sparks may quickly merge to form large stable flame front for ignition.
  • the number of electrodes and the placement of the electrodes and thus the spark producing gaps are selected based on the size of the cylinder in which the spark plug is to be received or the available area in the combustion chamber (i.e., typically the middle of the radius of the cylinder).
  • the electrodes are placed in a ring-like manner around the outer edge of the insulative body 40.
  • the materials used to make the electrodes 20-26 and the insulative body portion 40 of the spark plug 10 can be materials commonly used for such applications in known spark plugs.
  • the spark plug 10 is manufactured by embedding the main electrode 20 and the intermediate electrodes 22, 24 in the insulative end portion 40 of the spark plug 10.
  • the main electrode 20 includes an electrical connection end 2OA and a spark ignition end 2OB.
  • the main electrode 20 extends through the insulative body 40 with the spark ignition end 20B and the electrical connection end 2OA protruding beyond the insulative body 40 in opposing directions along the longitudinal axis of the spark plug 10.
  • the electrical connection end 2OA facilitates connection to a source of electrical current (not shown).
  • the intermediate electrodes 22, 24 are generally U-shaped electrodes and are sealed in the insulative portion 40 of the spark plug body such that the ends 22A, 22B, 24A, 24B of the electrodes 22, 24 extend from a combustion chamber facing surface 42 of the spark plug body 10 as shown in FIG. 1. As best seen in FIG. 2, the intermediate electrodes 22, 24 have a mid portion 23 connecting the respective ends 22A, 22B, 24A, 24B that is embedded in the insulative body portion 40 of the spark plug. The ends 22 A, 22B, 24A, 24B of the intermediate electrodes 22, 24 are spaced apart from one another to form the spark gaps 30, 32, 34 between adjacent ends. Using this design, a spark plug 10 having multiple electrodes 20, 22, 24, 26 can be manufactured in an economical manner.
  • the spark plug may be manufactured by inserting the electrodes 20, 22, 24, 26 in the insulative body portion 40 of the spark plug body 10 and then sealing the insulative body portion using methods well known in the art.
  • the insulative body 40 may be a ceramic molding.
  • the electrodes 20, 22, 24, 26 can be positioned then the insulative body 40 is molded around the electrodes using conventional techniques.
  • the spark plug 10 facilitates the formation of an electrical circuit.
  • electrical current may be applied to the electrical connection end 2OA of the main electrode 20 and may flow to the spark ignition end 2OB thereof. Such current may continue to flow progressively to the intermediate electrodes 22, 24 by traversing the spark gaps 30, 32 therebetween in the form of sparks.
  • the electrical circuit is completed as a spark traverse from the last intermediate electrode 24 to the ground 26.
  • the size, shape, material selection and relative positioning of the spark ignition end 2OB of the main electrode 20, the intermediate electrodes 22, 24 and the ground 26 will impact upon the propensity of sparks traversing the spark gaps 30, 32, 34.

Landscapes

  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

La présente invention concerne une bougie qui produit simultanément une pluralité d'étincelles dans une chambre de combustion de moteur thermique au moyen d'une pluralité d'électrodes en série. Cette bougie comprend un corps isolant, une électrode principale, une masse et une pluralité d'électrodes intermédiaires partiellement intégrées dans la partie isolante de la bougie de sorte que la puissance haute tension saute une pluralité d'écartement entre les électrodes puis passe à la masse à l'écartement final. De préférence, les électrodes intermédiaires possèdent une forme générale en U et sont scellées dans la partie isolante du corps de bougie de sorte que l'extrémité de la patte s'étende à partir d'une chambre de combustion en face de la surface de la bougie. Les extrémités des électrodes intermédiaires sont espacées entre elles de façon à former des écartements entre les extrémités contiguës.
PCT/US2005/026208 2004-07-28 2005-07-25 Bougie a etincelles multiples Ceased WO2006014840A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59164504P 2004-07-28 2004-07-28
US60/591,645 2004-07-28

Publications (2)

Publication Number Publication Date
WO2006014840A2 true WO2006014840A2 (fr) 2006-02-09
WO2006014840A3 WO2006014840A3 (fr) 2006-06-15

Family

ID=35787734

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/026208 Ceased WO2006014840A2 (fr) 2004-07-28 2005-07-25 Bougie a etincelles multiples

Country Status (1)

Country Link
WO (1) WO2006014840A2 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6603245B1 (en) * 1988-09-23 2003-08-05 Jay W. Fletcher Three-dimensional multiple series gap spark plug

Also Published As

Publication number Publication date
WO2006014840A3 (fr) 2006-06-15

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