| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a manufacturing method of a spark plug, and the spark plug manufactured by its manufacturing method wherein a position in which an impact by a spark is frequently generated in a side peripheral face of the center electrode can be protected effectively and improvement of a durability against a spark consumption can be accomplished in a hybrid spark plug provided with a parallel earth electrode and a semi creepage earth electrode. SOLUTION: In a shaft state member 201 which becomes an electrode base material of the center electrode, at a side face front end or nearest to the side face front end side in the case one side of the shaft line direction is taken as the forward side, bonding is carried out in which a metallic member for spark consumption resistance composed of a metal with a high spark consumption resistance property is bonded to form a bonded body. Further, tip part molding is carried out after the bonding process, and against the front end part of the side face of the bonded body 210 of the shaft state member 201, by applying a plastic working and/or a remove working in a shape of stretching over both of the electrode base material and the metallic member for the spark consumption resistance, a convex part made of a metal for the spark consumption resistance is formed. Then, a noble metal chip bonding process in which the noble metal chip is bonded in a forward direction of the tip part after that tip part molding process, thereby the center electrode 2 having the convex part 2k consisted of the metallic member for the spark consumption resistance is obtained.</p> |
