Spark plug having dual gaps

Details Spark plug having dual gaps Spark plug having dual gaps

1981-04-24

1984-03-27

Demeo, Palmer C.

Electric lamp and discharge devices

Spark plugs

Plural parallel gaps

313142, H01T 1320

Patent

active

044397089

ABSTRACT:
A spark plug includes a body of dielectric substance mounted on one of central and earth electrodes and having polarization effects. A gap for capacitive discharge is defined between the body of dielectric substance and the other of the electrodes, and a gap for inductive discharge is defined between the electrodes, which gap for inductive discharge is larger in dimension than the gap for capacitive discharge. With the arrangement, capacitive discharge to be produced in the early stage of discharge is caused at low discharge breakdown voltage due to polarization effects of the body of dielectric substance, and inductive discharge taking the main part of discharge for ignition is produced by utilizing the capacitive discharge of low voltage as trigger, thereby lowering discharge breakdown voltage to improve ignition performance of the spark plug.

REFERENCES:
patent: 2900547 (1959-08-01), Engel
patent: 3854067 (1974-12-01), Morgan
patent: 3872338 (1975-03-01), Wax

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