Spark plug and method of manufacturing the same
a technology of spark plugs and spark plugs, applied in the field of spark plugs, can solve the problems of affecting the quality of spark plugs, and affecting the quality of spark plugs, and achieve the effect of superior air tightness
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[0046]Hereafter, a description will be given, referring to the drawings, of one embodiment. FIG. 1 is a partially sectioned front view showing a spark plug 1. In FIG. 1, a description will be given with a direction of an axis CL1 of the spark plug 1 as an up-down direction in the drawing, the lower side as a leading end side of the spark plug 1, and the upper side as a rear end side.
[0047]The spark plug 1 is configured of an insulator 2 acting as an insulator forming a hollow cylindrical shape, a hollow cylindrical metal shell 3 which holds the insulator 2, and the like.
[0048]The insulator 2, being formed by firing alumina or the like, as is well known, includes in the external portion thereof a rear end side barrel portion 10 formed on the rear end side, a large diameter portion 11 formed closer to the leading end side than the rear end side barrel portion 10 so as to protrude radially outward, a middle barrel portion 12 formed closer to the leading end side than the large diameter...
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