Service HotlineThose who are familiar with bimetallic cylinder liners should know that they are divided into two types: dry bimetallic cylinder liners and wet bimetallic cylinder liners. We should selectively purchase according to our own actual situation.
Let's first introduce the dry bimetallic cylinder liner. The dry bimetallic cylinder liner does not come into direct contact with cold water, has a thin wall, and fits snugly with the cylinder body bearing hole, making it less prone to water and moisture leakage; Next, let's learn about wet bimetallic cylinder liners. Wet bimetallic cylinder liners come into direct contact with cold water, have thick walls, good heat dissipation effects, and are prone to air and cold leaks.
Bimetallic cylinder liners are divided into two categories: dry bimetallic cylinder liners and wet bimetallic cylinder liners. The dry bimetallic cylinder liner has a thin thickness, simple structure, and easy processing. Wet bimetallic cylinder liners come into direct contact with cooling water, which is beneficial for engine cooling and the miniaturization and lightweighting of the engine.
Bimetallic cylinder liner is the abbreviation for engine gas bimetallic cylinder liner, which is embedded in the cylinder of the cylinder block and forms the combustion chamber together with the piston and cylinder head. The gas bimetallic cylinder liner that does not come into contact with cooling water on the back is called a dry bimetallic cylinder liner, while the gas bimetallic cylinder liner that comes into contact with cooling water on the back is a wet bimetallic cylinder liner.
The bimetallic cylinder liner should have sufficient strength, stiffness, 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: non bimetallic cylinder liner type, dry bimetallic cylinder liner type, and wet bimetallic cylinder liner type.
The body without bimetallic cylinder liners is a body without embedded bimetallic cylinder liners, and cylinders are 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. The dry bimetallic cylinder liner does not come into contact with the coolant, with a wall thickness of 2-3mm. The outer surface and the inner surface of the bimetallic 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 bimetallic 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 bimetallic cylinder liner with the corresponding support surface at the top of the engine body. The advantage of wet bimetallic 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 bimetallic 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.
