| 摘要 |
PROBLEM TO BE SOLVED: To provide a spark plug shell in which a heat radiating property is raised by devising a better structure of a cylindrical shank and ignition precision and durability are improved. SOLUTION: In a spark plug shell 1 having a cylindrical shank 1e with a hexagonal head 1c on one end and a screw part 1d on a circumference of the other end, a serration is formed in order that a heat radiating area can be expanded inside the cylindrical shank 1e and a heat radiating property can be improved. COPYRIGHT: (C)2007,JPO&INPIT
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