The engine body group is mainly composed of the body, cylinder head, cylinder head cover, cylinder liner, main bearing cap and oil pan. The body group is the bracket of the engine, and is the assembly base of the crank connecting rod mechanism, the gas distribution mechanism and the main parts of the engine systems.
The body is a continuous casting body of the cylinder block and the crankcase, and is generally cast with high-strength gray cast iron or aluminum alloy. The structure of the engine body is related to the arrangement of the cylinders, the structure of the cylinders and the structure of the crankcase. The arrangement of the cylinders is divided into in-line, V-type, and horizontally opposed. This engine adopts in-line.
The cylinder head is used to close the top of the cylinder and forms the combustion chamber together with the piston top and the cylinder wall. In addition, the water passages and oil passages in the cylinder head and the body, as well as the oil pan are the components of the cooling system and the lubrication system respectively.
The cylinder gasket is the seal between the top surface of the block and the bottom surface of the cylinder head. Its function is to keep the cylinder seal airtight, and keep the coolant and engine oil flowing from the body to the cylinder head from leaking. The cylinder liner bears the pressure generated when the cylinder head bolts are tightened, and is subjected to the high temperature and high pressure of the combustion gas in the cylinder, as well as the corrosion of engine oil and coolant.
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