How to classify the cylinder block? What are the structural characteristics of each?
The cylinder block should have sufficient strength and rigidity. According to the position of the cylinder block and the oil pan mounting plane, the cylinder block is usually divided into the following three forms.
(1) The general type cylinder block is characterized in that the oil pan mounting plane and the crankshaft rotation center are at the same height. The advantage of the cylinder block is that the height of the cylinder body is small, the weight is light, the structure is compact, the processing is convenient, and the crankshaft is easy to disassemble; but the disadvantage is that the rigidity and the strength are poor.
(2) The gantry type cylinder block is characterized in that the oil pan mounting plane is lower than the rotation center of the crankshaft. Its advantages are good strength and stiffness, and can withstand large mechanical loads; but its shortcomings are poor processability, heavy structure and difficult processing.
(3) Tunnel type cylinder block The main bearing hole of the cylinder block of this type is a one-piece type, which adopts a rolling bearing, the main bearing hole is large, and the crankshaft is loaded from the rear of the cylinder block. The advantages are compact structure, good rigidity and strength, but the disadvantages are high processing precision, poor processability, and inconvenient cranking.