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US 12,283,796 B2Granted
Spark plug
AssigneeNiterra Co., Ltd.
InventorsNatsuki Kurimoto, Naomichi Miyashita, Naoki Sakade, Kanji Higuchi
Life of this patent
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Abstract
A spark plug includes a center electrode extending along an axial line, a metal shell holding the center electrode in an insulated manner, and a ground electrode connected to the metal shell by a connection portion. At least one of the center electrode and the ground electrode includes a protrusion. A discharge member joined to the protrusion via a fused portion forms a spark gap between the discharge member and the other one of the electrodes. A recess is formed at a position including the protrusion.
Claims8
A spark plug comprising:
- a center electrode extending along an axial line;
- a metal shell holding the center electrode with an insulator interposed therebetween;
- and
- a ground electrode connected to the metal shell by a connection portion,
- wherein the center electrode includes a protrusion, a discharge member, and a fused portion, the protrusion protruding from an end of the insulator, and the discharge member being joined to the protrusion and forming a spark gap between the ground electrode and the discharge member, the fused portion joining the discharge member to the protrusion, and
- wherein a recess is formed at a position including the protrusion.
3 more elements
A spark plug comprising:
- a center electrode extending along an axial line;
- a metal shell holding the center electrode with an insulator interposed therebetween;
- and
- a ground electrode connected to the metal shell by a connection portion,
- wherein the ground electrode includes a protrusion, a discharge member, and a fused portion, the protrusion being formed on an end portion of the ground electrode, and the discharge member being joined to the protrusion and forming a spark gap between the center electrode and the discharge member, the fused portion joining the discharge member to the protrusion, and
- wherein a recess is formed at a position including the protrusion.
3 more elements
Dependencies are inferred from the claim text.