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US 12,407,148 B2Granted
Spark plug
AssigneeNiterra Co., Ltd.
InventorsKaito Nakamura, Daisuke Sumoyama, Takaaki Kikai, Kengo Hattori
Life of this patent
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Abstract
A spark plug which is reduced in consumption of a discharge member, thereby having a longer service life. This spark plug is provided with: a first electrode that comprises a discharge member; and a second electrode that faces the discharge member, with a spark gap lying therebetween. The discharge member is mainly composed of Ru, while containing 0.5% by mass to 30% by mass of Ni or Co.
Claims3
A spark plug comprising:
- a center electrode including a base material and a discharge member at a tip of the base material, the discharge member covering a front end of the tip of the base material;
- and
- a ground electrode opposed to the discharge member with a spark gap therebetween, wherein
- the discharge member contains Ru as a main component, and not lower than 0.5% by mass and not higher than 30% by mass of Ni or Co.
1 more element
Dependencies are inferred from the claim text.