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US 10,833,486 B1Granted
Spark plug
AssigneeNgk Spark Plug Co., Ltd.
InventorsTatsuya Gozawa, Kenji Ban, Daiki Goto
Life of this patent
Estimating the term…
Abstract
A spark plug having excellent ignitability including a rod-shaped center electrode; a ground electrode that includes a facing portion facing a front end portion of the center electrode and forms a discharge gap between the facing portion and the front end portion of the center electrode; an insulator; a metal shell; and a cover portion that covers, from a front end side of the spark plug, the front end portion of the center electrode and the facing portion of the ground electrode to form a pre-chamber and includes injection holes that are through holes.
Claims4
A spark plug, comprising:
- a rod-shaped center electrode extending along an axial line, the center electrode having a front end portion, the front end portion having an outer periphery;
- a ground electrode having a facing portion, the facing portion facing the front end portion of the center electrode, the facing portion being positioned to form a discharge gap with the front end portion of the center electrode, the facing portion including a proximity portion that is closest to the front end portion of the center electrode, the proximity portion being positioned in a virtual space that is an inside of a cylindrical shape formed by extending the outer periphery of the front end portion of the center electrode in a direction of the axial line of the center electrode;
- a cylindrical insulator having a front end, the cylindrical insulator accommodating the center electrode therein with the front end portion of the center electrode being exposed from the front end of the insulator;
- a cylindrical metal shell that accommodates the insulator therein;
- and
- a cover portion that covers the front end portion of the center electrode and the facing portion of the ground electrode to form a pre-chamber, the cover portion including at least one injection hole that is a through hole,
- wherein a middle point of a shortest line segment connecting the front end portion of the center electrode and the proximity portion of the facing portion is displaced from the axial line of the center electrode.
4 more elements
Dependencies are inferred from the claim text.