Spark plug and its manufacturing method
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United States of America Patent
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Jul 3, 2012
Grant Date -
Jan 5, 2012
app pub date -
Jun 28, 2011
filing date -
Jul 2, 2010
priority date (Note) -
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Abstract
A spark plug includes an insulator, a center electrode, a metal shell, a ground electrode, and a noble metal tip joined to at least one of the two electrodes. The noble metal tip is joined to the electrode via a melt portion formed by using a laser or electron beam from a side surface of the noble metal tip. In a predetermined section, including a central axis of the noble metal tip, ¾ or more of one end face of the noble metal tip is joined to the electrode. When the thickness of the melt portion is taken to be TX (mm), and the length in a direction of irradiation with the laser beam is taken to be LX (mm), TX and LX satisfy 1.5≦LX/TX, and an angle αX or angle αY, formed by two predetermined straight lines, satisfies −15≦αX (αY)≦25.
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