Spark Plug Composition Structure?

[LaPreston]

Spark plugs are mainly composed of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. What is a spark plug: A spark plug is a crucial component in the ignition system of a gasoline engine. It introduces high-voltage electricity into the combustion chamber, causing it to jump across the electrode gap and generate a spark, thereby igniting the combustible air-fuel mixture in the cylinder. What does a spark plug consist of: Spark plugs are primarily made up of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. How does a spark plug work: Under high voltage, the air between the center electrode and side electrode of a spark plug rapidly ionizes, forming positively charged ions and negatively charged free electrons. When the voltage between the electrodes reaches a certain level, the number of ions and electrons in the gas increases like an avalanche, causing the air to lose its insulating properties and forming a discharge channel in the gap, resulting in a "breakdown" phenomenon. At this point, the gas becomes a luminous body, known as a "spark." Along with the heat and expansion, a "crackling" sound is also produced. The temperature of this electric spark can reach as high as 2000-3000°C, sufficient to ignite the air-fuel mixture in the cylinder's combustion chamber.