Service HotlineCeramic cylinder liners should have sufficient strength, rigidity, and heat resistance, as well as good wear resistance. Good lubrication and cooling should be provided during work. The inner surface of the cylinder is prone to wear due to the action of high-temperature and high-pressure gas and contact with the high-speed moving piston. There are different cylinder structure forms and surface treatment methods to improve the wear resistance and prolong the service life of cylinders. There are three types of cylinder structures: ceramic free cylinder liner, dry ceramic cylinder liner, and wet ceramic cylinder liner.
The ceramic cylinder liner free body refers to a body that does not have ceramic cylinder liners embedded, and the cylinder is directly machined on the body. The advantage is that it can shorten the center distance of the cylinder, reducing the size and mass of the body. But the cost is relatively high. Dry ceramic cylinder liner does not come into contact with coolant, with a wall thickness of 2-3mm. The outer surface and the inner surface of the ceramic cylinder liner seat hole must be precision machined to ensure necessary positional accuracy and facilitate disassembly and assembly. The advantages are high body stiffness, small cylinder center distance, light weight, and simple processing technology. The disadvantage is poor heat transfer, uneven temperature distribution, and easy occurrence of local deformation.
The outer wall of the wet ceramic cylinder liner is in direct contact with the coolant, with a wall thickness of 5-8mm. Radial positioning is achieved using upper and lower positioning rings, while axial positioning is achieved by matching the upper flange of the ceramic cylinder liner with the corresponding support surface at the top of the machine body. The advantage of wet ceramic cylinder liner is that there is no sealed water jacket on the body, making it easy to cast, with good heat transfer, uniform temperature distribution, and convenient repair. The ceramic 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 water leakage.
As is well known, ceramic cylinder liners are one of the main components of combustion chambers, and sometimes small parts also play a significant role. Now the ceramic cylinder liner manufacturer will introduce to you the reasons for abnormal wear of ceramic cylinder liners.
1. Severe wear in the middle of the ceramic cylinder liner: related to corrosion wear caused by engine undercooling and frequent cold starts, the cooling system should be checked.
2. Severe wear of the top dead center piston ring indicates that the engine is overheated and the heat dissipation is poor. Check the cooling system and ignition system (including spark plug selection), and check if the connecting rod big end bearing is loose.
3. Severe wear of the ceramic cylinder liner on the upper part of the cylinder: related to inhaling a large amount of dust or accumulating carbon. The air filter should be maintained or replaced, carbon deposits should be removed, and whether it is caused by oil grooves should be checked.
4. The ceramic cylinder liner at the lower part of the cylinder is severely worn: the oil contains a large amount of metal abrasive particles or dust, and should be replaced with clean oil.
