Spark plug structure
The spark plug consists of the following parts: 1. Wiring nut; 2. Central electrode; 3. Ground electrode; 4. Metal shell; 5. Insulator .
How the spark plug works
The ground electrode on the spark plug is connected to the metal housing, and is connected to the engine block through the cylinder head threaded connection. The insulator mainly plays the role of isolating the metal shell and the central electrode. The wiring nut is the part of the spark plug that is in contact with the high-voltage coil. After the current passes through the wiring nut and the central electrode, it breaks down the medium between the central electrode and the ground electrode to generate sparks, thereby igniting the mixture in the cylinder.
Specific process:
1.Spark
In the spark plug The high voltage generated by the ignition device is applied between the center electrode and the ground electrode, the insulation state between the electrodes is destroyed, and a current is generated, and the discharge generates an electric spark. The spark energy determines whether the compressed air mixture can be ignited and exploded. The discharge phenomenon is completed in a very short time (about one thousandth of a second) and is extremely complex.
The function of the spark plug is to generate a strong spark between the electrodes within a specified time, which becomes the starting point of the combustion of the mixture.
2. Ignition
Ignition caused by electric spark is to activate combustion particles through spark discharge between electrodes, resulting in a chemical reaction ( acid), and a thermal effect occurs, eventually forming a flame core. This thermal energy activates the surrounding air-fuel mixture, and finally forms a flame core that expands toward the periphery with self-combustion as the center.
