IGNITION SYSTEM

摘要

An ignition system for an internal combustion engine includes a discharge portion of the center electrode in which a part thereof is surrounded by a bottom portion and a tubular tip portion of the center dielectric, the part of the discharge portion and the tubular tip portion are projected into a combustion chamber of the internal combustion engine from a substantially annular tip portion of the ground electrode that opens to the combustion chamber at a distal end of the ground electrode, a diameter-changing portion formed by reducing a diameter of a part of the tubular tip portion in a radial direction gradually as approaching toward a tip thereof, and a thin-walled portion formed by reducing a thickness of the tip of the tubular tip portion.

主权项

1. An ignition system for an internal combustion engine comprising:
a substantially shaft-like center electrode that has a length with a base end and a tip end in both ends thereof; a substantially bottomed cylindrical center dielectric disposed coaxially with the center electrode; a substantially cylindrical ground electrode disposed coaxially with the center dielectric with a discharge gap having a predetermined distance therebetween; a power source that applies a high voltage between the center electrode and the ground electrode; a discharge portion of the center electrode in which a part thereof is surrounded by a bottom portion of the center dielectric; a tubular tip portion of the center dielectric; the part of the discharge portion and the tubular tip portion are projected into a combustion chamber of the internal combustion engine from a substantially annular tip portion of the ground electrode that opens to the combustion chamber at a distal end of the ground electrode; a diameter-changing portion formed by reducing a diameter of a part of the tubular tip portion in a radial direction gradually as approaching toward a tip thereof; and a thin-walled portion formed by reducing a thickness of the tip of the tubular tip portion.