Spark plug having horizontal discharge

Details Spark plug having horizontal discharge Spark plug having horizontal discharge

1994-08-16

1996-03-26

Yusko, Donald J.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, 123169EL, H01T 1320

Patent

active

055023525

ABSTRACT:
According to the present invention, a spark plug for an internal combustion engine includes a center electrode, a ground electrode so as to form a spark gap with the center electrode, and a tip electrode composed of a material having a superior consumable resistance as compared to the center electrode and disposed on an end face of the center electrode so as to form a spark gap with the ground electrode. An axial length of the discharge portion of the ground electrode where spark discharge occurs is substantially larger than an axial length of the tip electrode where spark discharge occurs. When used for an internal combustion engine, a spark discharge is mainly generated between the peripheral surface of the center electrode and the ground electrode during early operation. Consequently, as the center electrode has been consumed, the spark discharge is mainly generated between the tip electrode and the ground electrode. Therefore, the frequency of the spark discharge with the center electrode is lowered, and a low required voltage is maintained.

REFERENCES:
patent: 4514657 (1995-04-01), Igashira et al.

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