Automotive engine cylinder liners are divided into two categories: dry cylinder liners and wet cylinder liners. The difference is:
1. If exposed to cold water. The back side of the dry cylinder liner does not come into contact with the cooling water, and the back side of the wet cylinder liner does not come into contact with the cooling water.
2. Differences in appearance and structure. The dry cylinder liner is thinner, has a simple structure and is easy to process. The wet cylinder liner is thicker and has a more complex structure than the dry cylinder liner.
3. Different performance functions. The wet cylinder liner is in direct contact with the cooling water, which is beneficial to engine cooling and reducing engine size and weight.
The rear side of the dry cylinder liner does not entern contact with the cooling water, the engine cooling time is therefore long.
Detailed information:
1. Structural form of the cylinder liner
Dry cylinder liner is not used for Contact with the coolant, the wall thickness is 2-3mm, the outer surface and the inner surface of the cylinder liner seat hole must be precisely machined to ensure the necessary positional accuracy and facilitate disassembly and assembly. The advantages are high body rigidity, small cylinder center distance, light weight and simple processing technology. The disadvantages are poor heat transfer, uneven temperature distribution and a tendency to local deformation.
The outer wall of the wet cylinder liner is en direct contact with the coolant. The wall thickness is 5-8mm. The upper and lower positioning rings are used to achieve radial positioning. upper flange of the cylinder liner to match the corresponding bearing surface on the top of the body.
The advantage of wet cylinder liner is that there is no water liner sealed on the body, it is easy to flow, it has good transfer heat, relatively uniform temperature distribution and is easy to repair. The 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.
2. Analysis of the causes of wear of cylinder liners
The working environment of cylinder liners is very harsh and the causes of wear are numerous. Normal wear and tear is generally allowed for structural reasons, butImproper use and maintenance will result in abnormal wear.
1. Wear caused by structural reasons.
2. Wear caused by misuse.
3. Wear caused by poor maintenance.
Baidu Encyclopedia - Automotive Cylinder Liner
Baidu Encyclopedia - Automotive Cylinder Liner cylinder
The waste heat of the internal combustion engine generator set is
1. The cylinder block is the largest body of the diesel engine (the main part below the cylinder head and above the oil pan), the cylinder block is installed on the oil pan, and the cylinder head is installed on the cylinder block. The cylinder block is usually made of ductile iron.
2. Cylinder liner - a working cavity installed in the cylinder body, in the form of a circular tube (the inner cavity is smooth, the outer wallThere are flanges and groovess o-ring at the top end, and there are also o-ring grooves at the bottom end). The inner wall of the cylinder liner, the piston and the cylinder head jointly form a combustion cavity, and the outer wall of the cylinder liner is used to cool the water. Water present in the cylinder body cavity and heat from diesel combustion is transferred to the cooling water through the outer walls of the cylinder liner. The material of the cylinder liner is generally made of. high temperature and friction resistant materials.
What is engine humidity?
Exhaust gas, cooling water.
1. The heat lost during the operation of the internal combustion engine mainly includes exhaust gas and cooling water (cylinder liner cooling water, lubrication system cooling water).ification, intercooler cooling water).
2. During the operation of the internal combustion engine, the heat exchanger is divided into a high temperature water system and a low temperature water system according to different medium temperatures. mainly first level intercooler, first level lubricating oil cooling and cooler cylinder liner.
Wet cylinder liner of the cylinder of an automobile engine. The wet cylinder liner is a thick-walled sleeve in direct contact with cooling water. The wall thickness should ensure that the cylinder liner has sufficient strength and rigidity, generally 5.% of the cylinder diameter ~10%. It dissipates heat well, cools evenly and is easy to process. Usually, only the interior surface needs to be finished, while the exterior surface in contact with water does notdoes not need to be treated. However, it is easy to disassemble and assemble. The disadvantage is that the strength and rigidity are not as good as that of dry cylinder liner, and it is easy to produce water leakage.