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US 9,871,352 B2Granted
Spark plug
AssigneeNgk Spark Plug Co., Ltd.
InventorsSeiji Nakano, Kouta Yamauchi, Hironori Uegaki
Life of this patent
Estimating the term…
Abstract
The spark plug includes: an insulator having a through hole that penetrates therethrough along an axial direction; a center electrode disposed on one end side of the through hole; a metal terminal disposed on the other end side of the through hole; and a conductive seal layer connected to at least one of the center electrode and the metal terminal. The conductive seal layer contains glass and a Cu—Zn alloy. A volumetric percentage of the Cu—Zn alloy in the conductive seal layer is greater than or equal to 44% and not greater than 55%.
Claims4
A spark plug comprising:
- an insulator having a through hole that penetrates therethrough along an axial direction;
- a center electrode disposed on one end side of the through hole;
- a metal terminal disposed on the other end side of the through hole;
- and
- a conductive seal layer connected to at least one of the center electrode and the metal terminal, wherein
- the conductive seal layer contains glass and a Cu—Zn alloy, and
- a volumetric percentage of the Cu—Zn alloy in the conductive seal layer is greater than or equal to 44% and not greater than 55%.
4 more elements
Dependencies are inferred from the claim text.