What is the principle of the engine valve train?

[VanRose]

The principle of the engine valve train is to open and close the intake and exhaust valves of each cylinder in a timely manner according to the working cycle and ignition sequence requirements of each cylinder of the engine, allowing fresh air to be drawn into the cylinder and exhaust gases to be expelled from the cylinder after combustion. Depending on the installation position of the valves, the valve train can be divided into two types: overhead valve train and side valve train. An engine is a machine that converts other forms of energy into mechanical energy, originating in the UK. It can refer to both the power generation device and the entire machine including the power unit. Types of engines include internal combustion engines (gasoline engines), external combustion engines, electric motors, etc.