The four-stroke engine is used in a wide range, and the four-stroke engine means that the piston does four reciprocating movements and the cylinder fires once. The specific working principle is as follows:
1. Intake air: At this time, the intake valve opens, the piston goes down, and the mixture of gasoline and air is sucked into the cylinder.
2. Compression: At this time, the intake valve and exhaust valve are closed at the same time, the piston is up, and the mixture is compressed.
3. Combustion: When the mixer is compressed to the minimum spark plug fire igniting the mixed gas, the pressure generated by combustion pushes the piston down and drives the crankshaft to rotate.
4. Exhaust: When the piston goes down to the lowest point, the exhaust valve opens, the exhaust gas is discharged, and the piston continues to discharge the excess exhaust gas.
The working process of the two-punch engine is as follows:
1. Piston upward movement mixed air into the crankcase.
2. Piston down the mixed pressure to the combustion chamber to complete the first compression.
3. After the gas is mixed to the cylinder, the piston closes the intake and exhaust ports, and the spark plug ignits when the piston compresses the gas to the minimum volume (this is the second compression).
4. The combustion pressure pushes the piston down, and when the piston goes down to a certain position, the exhaust port opens first, the exhaust gas is discharged, and then the intake port opens, and the new mixture enters the cylinder to squeeze out the remaining exhaust gas.