Engine valve train introduction
The engine valve train (internal engine valve train) is to open and close the intake and exhaust valves of each cylinder according to the requirements of the work cycle and ignition sequence in each cylinder of the engine, so that the fresh combustible mixture (gasoline engine) Or the air (diesel engine) can enter the cylinder in time, and the exhaust gas can be discharged from the cylinder in time. In the compression and work strokes, the valve is closed to ensure the seal of the combustion chamber.