| 摘要 |
PROBLEM TO BE SOLVED: To provide a spark plug for an internal-combustion engine in which suppression of a channeling and suppression of a spark exhausting of the center electrode are compatible. SOLUTION: The spark plug 100 for this internal-combustion engine has a cylindrical insulator 140 having a shaft hole 140b, the center electrode 120 which is inserted in the tip part side of the shaft hole 140 and in which the tip part 120b is protruded from the tip side of the insulator 140, a ground electrode 110 in which at least one part of spark discharges generated between the tip surface 110b and the tip part side face 120c of the center electrode 120 is arranged so that a surface discharge along the tip part side face 140e of the insulator 140 and the tip surface 140d may be included. The tip part 120b of the center electrode 120 contains Ni of 80 wt% or more as the main component, and Fe and Cr of 2.5 wt% or more and 10.0 wt% or less as accessory constituents in total, and furthermore, Al of 0.2 wt% or more and 0.8 wt% or less are contained. COPYRIGHT: (C)2004,JPO&NCIPI
|
