Introduction to Spark Plug Structure

1. Steel shell: The lower part of the steel shell has a fine thread, which is used to fit with the spark plug hole in the cylinder head. The upper part has an outer hexagonal nut, which is used to install the spark plug sleeve for tightening or screwing out the spark plug .
2. The metal rod is the central electrode. The lower end of the metal rod is in contact with the upper end of the central electrode through a conductor glass body, and the upper end of the metal rod is equipped with a wiring nut .
3. There is a high alumina ceramic insulator between the steel shell and the central electrode, which insulates the central electrode when energized .
4. The lowest part of the steel shell is equipped with curved side electrodes .
5. There is a copper washer in the middle of the outer part of the steel shell .