SPARK PLUG AND INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Nov 27, 2014
app pub date -
Nov 21, 2012
filing date -
Nov 24, 2011
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Abstract
To improve a heat conductance of an center electrode of a spark plug in which its center electrode protrudes to a combustion chamber from the defining surface of the chamber, the ignition plug includes a center electrode to where high voltage for spark discharge is applied; an insulator having a penetration hole to where the center electrode is fit; and an earth electrode that forms a discharge gap between the center electrode at where the spark discharge is generated. The center electrode protrudes from a defining surface of an internal combustion engine to a combustion chamber when the ignition plug is attached to the engine. The entirety of a main body of the center electrodes that is fixed by fitting into a penetration hole of the insulator is made of high heat conductance material having heat-conductivity of 250 W/mK or more.
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