What are the two major mechanisms and five major systems of an automobile?

[DeReese]

The two major mechanisms of an automobile engine are the crank-connecting rod mechanism and the valve train mechanism. The five major systems are the starting system, fuel supply system, cooling system, lubrication system, and ignition system. The specific introductions are as follows: Crank-connecting rod mechanism: The crank-connecting rod is an important component of an automobile engine that realizes the working cycle and completes energy conversion. It consists of the engine block group, piston-connecting rod group, and crankshaft-flywheel group. Valve train mechanism: The function of the valve train mechanism is to open and close the intake and exhaust valves according to the working sequence and process of the engine, allowing the combustible mixture or air to enter the cylinder and exhaust the waste gas from the cylinder, achieving the gas exchange process. Starting system: The process of rotating the crankshaft under external force until the engine starts to idle automatically is called engine starting. The device required to complete the starting process is called the engine starting system. Fuel supply system: The function of the gasoline engine fuel supply system is to prepare a certain amount and concentration of the mixture according to the requirements of the engine, supply it to the cylinder, and exhaust the combustion products from the cylinder. Cooling system: The function of the cooling system is to dissipate the heat absorbed by the heated parts in time to ensure that the engine works at the most suitable temperature. The cooling system of a water-cooled engine usually consists of a cooling water jacket, water pump, fan, radiator, thermostat, and other components. Lubrication system: The function of the lubrication system is to deliver a certain amount of lubricating oil to the surfaces of relatively moving parts to achieve liquid friction, reduce friction resistance, and reduce wear of the parts. Ignition system: The ignition system is usually composed of a generator, battery, distributor, ignition coil, spark plug, and other parts.