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US 9,853,422 B2Granted
Spark plug
AssigneeHyundai Motor Company
InventorsJung Hun Lee, Dong Soo Lee
Life of this patent
Estimating the term…
Abstract
A spark plug may include a center electrode disposed in a center portion of the spark plug, an insulator surrounding the center electrode, and a metal shell surrounding the insulator and having a ground electrode extending downwards from a lower end of the metal shell and an inner surface facing the insulator, the inner surface being concavely shaped to form a shielding space between the concavely shaped portion of the inner surface and the insulator for adjusting a heat range of the spark plug.
Claims7
A spark plug comprising:
- a center electrode disposed in a center portion of the spark plug;
- an insulator surrounding the center electrode;
- and
- a metal shell surrounding the insulator and having:
- a ground electrode extending downwards from a lower end of the metal shell;
- and
- an inner surface facing the insulator, wherein the inner surface is concavely shaped to form a shielding space between the concavely shaped portion of the inner surface and the insulator for adjusting a heat range of the spark plug,
- wherein the inner surface of the metal shell is concave to form the shielding space, the inner surface having an uneven section including concave portions and convex portions alternately arranged on the inner surface at a predetermined interval in an axial direction.
5 more elements
A spark plug comprising:
- a center electrode disposed in a center portion thereof;
- an insulator surrounding the center electrode;
- and
- a metal shell surrounding the insulator and having a ground electrode extending downwards from a lower end of the metal shell and an inner surface facing the insulator, the inner surface being concave to form a shielding space between the concave portion of the inner surface and the insulator so as to adjust a heat range,
- wherein the inner surface of the metal shell is concavely shaped to form the shielding space therein;
- and
- wherein the inner surface of the metal shell has a zigzag-shaped section including threaded portions formed on the inner surface at predetermined intervals in an axial direction of the spark plug.
4 more elements
Dependencies are inferred from the claim text.