| 摘要 |
PROBLEM TO BE SOLVED: To provide a spark plug capable of restraining heated-surface ignition due to overheating of a grounding electrode, and realizing stable ignitability to fuel-air mixture even in case of an internal combustion engine with strong in-cylinder air stream existing in a combustion chamber. SOLUTION: In the spark plug 1 setting in protrusion a tip part 32 of a housing 30 exposed to an inside of the combustion chamber 400 so as to cover a tip part 21 of an insulator 20 in nearly ring-shaped and making at least a part of the outer periphery face a rectifying means for rectifying the in-cylinder air flowing in the combustion chamber 400 and guiding it in a desired direction, a tip 310 of the grounding electrode 31 opposed to a central electrode 10 arranged on a center axis C/L is to be decentered toward a base-end side of the housing 30 with a given angle of eccentricityθ<SB>OFS</SB>against the center axis C/L, and at the same time, the rectifying means is to make an outer periphery face of the tip part 32 of the housing 30 a part of a slanted face of a circular cone with one point on a linear line connecting a tip 101 of the central electrode 10 and the tip 310 of the grounding electrode 31 as a virtual vertex P. COPYRIGHT: (C)2011,JPO&INPIT
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