Spark plug and ignition apparatus using same

Details Spark plug and ignition apparatus using same Spark plug and ignition apparatus using same

2006-08-08

2006-08-08

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Igniters

Sparkers

C313S141000

Reexamination Certificate

active

07086363

ABSTRACT:
A power-saving type of ignition apparatus is provided with a spark plug of which electrodes (30, 40) are regulated in their shapes to lower an amount of energy required for its ignition. To face to a tip (31) of a center electrode (30) extending from a mounting bracket (10), a cylindrical protrusion (41) is built on one surface (43) of an earth electrode (40). The protrusion extends toward the center electrode to form a discharge gap (50) between the protrusion and the tip of the center electrode. Both of the tip of the center electrode and the protrusion of the earth electrode are 2.3 [mm] or less in each diameter (D1,D2), thus an amount of energy required for ignition being limited to 17 [mJ] or less.

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