The inner surface of the cylinder is very easy to wear due to the action of high temperature and high-pressure gas and contact with the piston moving at high speed. In order to improve the abrasion resistance of the cylinder and extend the service life of the cylinder, there are different cylinder structure forms and surface treatment methods. there are three types of cylinder liners according to the structure: no cylinder liner type, dry cylinder liner type, and wet cylinder liner type.
No cylinder liner type body, that is, a body without any cylinder liner, the cylinder is directly processed on the body, the advantage is that the center distance of the cylinder can be shortened, reduce the size and mass of the body, but the cost is higher.
The dry cylinder liner is not in contact with coolant, Wall thickness is 2 ~ 3mm, both the outer surface and the inner surface of the cylinder liner seat hole must be finished, to ensure the necessary positional accuracy and easy disassembly. The advantages are high rigidity of the body, the small center distance of the cylinder, lightweight and simple processing technology. disadvantages are poor heat transfer, uneven temperature distribution, and easy local deformation.
The outer wall of the wet cylinder liner is in direct contact with the coolant, wall thickness 5 ~ 8mm, radial positioning with upper and lower positioning loops, axial positioning is achieved by matching the upper flange of the cylinder liner with the corresponding bearing surface on the top of the body. the advantage of wet cylinder liner is that there is no sealed water jacket on the body, easy to cast, good heat transfer, relatively uniform temperature distribution, convenient repair, cylinder liner can be replaced without removing the engine from the car.the disadvantage is that the body has poor rigidity and is prone to leaking water.
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