Gasoline engine is generally composed of the following parts:
1. Engine block: it is the assembly base of all engine parts. It includes cylinder head, cylinder block and lower crankcase (oil pan). The cylinder head and the inner wall of the cylinder block together form a part of the combustion chamber. Many parts of the body are parts of other systems respectively.
2. Crank and connecting rod mechanism: it is the mechanism by which the engine generates and transmits power, through which the linear reciprocating motion of the piston is transformed into the rotary motion of the crankshaft to output power. It includes piston, piston pin, connecting rod, crankshaft with flywheel, cylinder block, etc.
3. Valve distribution mechanism: including intake valve, exhaust valve, valve tappet, camshaft and camshaft timing gear (driven by crankshaft timing gear), etc. Its function is to charge the combustible mixture into the cylinder timely and exhaust the exhaust gas from the cylinder in time.
4. Fuel supply system: gasoline engine fuel supply system includes gasoline tank, gasoline pump, gasoline filter, air filter, carburetor, intake pipe, exhaust pipe, exhaust muffler, etc. Its function is to mix gasoline and air into a suitable combustible mixture and supply it to the cylinder for combustion, and discharge the combustion generated exhaust gas from the engine.
5. Cooling system: mainly including water pump, radiator, fan, water distribution pipe, cylinder block and water jacket in cylinder head. Its function is to dissipate the heat of the high-temperature parts into the atmosphere, so as to ensure the normal operation of the engine.
6. Lubricating system: including oil pump, pressure limiting valve, lubricating oil passage, strainer, oil filter, oil radiator, etc. Its function is to supply lubricating oil to friction parts, so as to reduce the friction resistance between them, reduce the wear of parts, partially cool the friction parts and clean the friction surface.
7. Starting system: including the starting mechanism of the engine and its accessories.
