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公开(公告)号：US12160089B1
公开(公告)日：2024-12-03
申请号：US18747514
申请日：2024-06-19
Applicant: Niterra Co., Ltd.
Inventor： Kenji Ban , Naoyuki Mukoyama , Kento Kubota
Abstract: A spark plug includes a center electrode includes a base member, a tip and a melted portion. In a projection view formed by projecting the spark plug perpendicularly to an axial line direction, when an angle that is formed by a discharge surface of the tip and a straight line passing through a first boundary between the tip and the melted portion and a second boundary between the melted portion and the base member, the first boundary and the second boundary being located at two ends of an external shape line of the melted portion, expressed by θ, a distance between the first boundary and the discharge surface in the axial line direction expressed by A, and a distance between the first boundary and the second boundary in a direction perpendicular to the axial line expressed by B, 0
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