What are the main components of an engine in terms of mechanisms and systems?
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An engine consists of the crank-connecting rod mechanism, valve mechanism, cooling system, lubrication system, ignition system, fuel supply system, and starting system. An engine is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, and electric motors. Introduction to the two main mechanisms: 1. The crank-connecting rod mechanism converts the gas pressure generated after fuel combustion into the rotational torque of the crankshaft through the piston and connecting rod, utilizing the inertia of the flywheel to complete the four auxiliary strokes: intake, compression, power, and exhaust; 2. The valve mechanism opens and closes the intake and exhaust valves in a timely manner according to the engine's working sequence and the requirements of each cylinder's working cycle, allowing the combustible mixture or fresh air to enter the cylinder and expelling the exhaust gases.