US 6,095,124 A · Spark plug and an internal combustion engine igniting system using the same

Abstract

A spark plug having a center electrode, a ground electrode, and an insulator. The ground electrode has a firing surface formed in a tip end side, and the firing surface is opposed to a side face of the center electrode. The insulator covers the outside of the center electrode and is placed such that a tip end portion is between the side face of the center electrode and the firing surface of the ground electrode. A discharge high voltage is applied across the center electrode and the ground electrode such that a polarity of the center electrode is positive and that of the ground electrode is negative. The high voltage causes a spark discharge to be generated between the firing surface of the ground electrode and a tip end portion of the center electrode.

Claims20

Dependent claims

A spark plug comprising:

a center electrode;
a ground electrode in which a firing surface is formed in a tip end side, said firing surface being opposed to a side face of said center electrode;
and
an insulator which covers an outside of said center electrode and which is placed in a positional relationship that a tip end portion of said insulator is between said side face of said center electrode and said firing surface of said ground electrode;
wherein a discharge high voltage is applied across said center electrode and said ground electrode such that a polarity of said center electrode is positive, and a spark discharge is caused between said firing surface of said ground electrode and a tip end portion of said center electrode by the application of said high voltage.

2 more elements

An internal combustion engine igniting system, comprising:

at least one spark plug, each of the at least one spark plug including
a center electrode having a side face and an outside portion;
a ground electrode having a tip end side and a firing surface formed in said tip end side and being opposed to said side face of said center electrode;
and
an insulator covering said outside portion of said center electrode and placed in a positional relationship so that a tip end portion of said insulator is arranged between said side face of said center electrode and said firing surface of said ground electrode;
and
a discharge high voltage applying circuit for applying a discharge high voltage across the center electrode and the ground electrode of each of the at least one spark plug such that the polarity of said center electrode of each of the at least one spark plug is positive.

4 more elements

Dependencies are inferred from the claim text.

Spark plug and an internal combustion engine igniting system using the same

Life of this patent

Spark plug and an internal combustion engine igniting system using the same

Life of this patent

Abstract

Claims20