Spark plug

Details Spark plug Spark plug

2005-03-08

2005-03-08

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

Reexamination Certificate

active

06864623

ABSTRACT:
A front end portion of a center electrode3is a circular cylindrical center-electrode noble-metal ablation resistance portion31whose radius r mm and length l mm are determined so as to satisfy 5≦l/r2<20. An ignition-performance-improving ground electrode4is configured such that a distal end portion thereof is bent in a direction toward the center electrode3; and a rear end-edge32tof a distal end surface4s, 32sis located frontward in relation to a front end surface31aof the center-electrode noble-metal ablation resistance portion31. In orthogonal projection on a projection plane P perpendicularly intersecting an axis O of the center electrode3, the rear end-edge32tis located outward in relation to the front end surface31aof the center-electrode noble-metal ablation resistance portion31. A portion of the ignition-performance-improving ground electrode4which includes at least the rear end-edge32tis a ground-electrode noble-metal ablation resistance portion32.

REFERENCES:
patent: 59-37684 (1984-03-01), None

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