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Cylinder Liner
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Join Date: 12.12.2022
Posts: 1
Location: United States

Posted: 12.12.2022 6:22:31

What Is a Cylinder Liner?
The cylinder is one which is attached to the block of engine to create the cylinder and it is a vital component that makes up the engine interior.
It is in Japan they are generally referred to as Cylinder Liners, however certain countries (companies) refer to them as Cylinder Sleeves.
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Functions of Cylinder Liners
Function 1: Form the sliding surface
It is held tightly when the valve is in place, preventing the gas that is compressed or burning from escape into the manifold within the manifold and between it and Valve Seat.
Resistance to high-temperature fire
  • Low self-friction
  • A low coefficient of friction in the piston Ring.
  • A low consumption of lubricant oil
    Function 2 Conduction of heat
    Reduces friction between the cylinder head and vale simultaneously.
    Function 3 Keep airtightness
    Make sure that you prevent combustion and compressed gas from leaking. The liner must not be susceptible to deformation because of the pressure and temperature that is high within the cylinder.
    The cylinder wall of the engine is very high pressure/high temperature and the piston ring/piston sliding at a rapid speed especially with bus and truck engines, a long-lasting engine is required therefore we employ extremely friction-resistant casting material Cylinder Liners specifically for the cylinders.
    In recent years in order to make engines lighter engine blocks are being changed in castings to aluminium alloys however, aluminum alloys can suffer friction and deformation during direct sliding when used to create the inner circumference of the cylinder; thus, the aluminum die cast block is mostly used in the cylinder where the Liner is put into.
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    Different types of Cylinder Liners:
    There are three types of liners that are used in internal combustion engines.
  • Dry-liner
  • Wet-liner liner and
  • Finned Liner
    Dry liner:
    Liners that aren''t in contact with liquid coolant are referred to as dry lines. They are tube hollows that can be inserted into the block of cylinders.
    The picture below illustrates the basics of the structure of dry liner.
    The liner is inserted inside the cylinder block, which will fit perfectly within the mould. It is then secured to the top of the block. The coolants in the water jackets are not directly in touch on the liner.
    The pressure created due to burning of charge is blocked by the liner and the block of the engine. It is because of the low clearance between the liner as well as the block of the cylinder.
    The liner''s thickness is kept to a minimum within the interval of 1.5mm to 3 millimeters. The heat transfer process occurs through the liner to the engine block, and then from the engine block is then transferred to cool jackets.
    Thus, the time required for cooling down the engine is longer. Removing the dry liner requires specific tools, and they are not able to detect corrosion since they''re not directly in contact with any water jackets.
    Wet liners:
    Liners that come into direct contact with cooling fluid or coolants are known as wet liner. The design of wet liners differs slightly from dry liner.
    Construction of wet liner
    The picture below illustrates the fundamental structure of wet liner.
    Wet liners are installed within the cylinder block, and are secured at each end to avoid escape of coolant or cooling water. Wet liners are 3mm to 6mm higher than dry liners due to the fact that they do not have a supporting structure as the cylindrical block.
    The liner is the only thing that can take the force created by the combustion of the charge. The transfer of heat in the case of a wet liner is directly transferred between the liner and the coolant.
    This leads to a higher efficiency of heat transfer and the chamber will be able to attain higher temperatures to improve thermal efficiency. It is very easy to remove the wet liner since it''s not fitting as tightly as dry lined ones.
    Finned Liner:
    Finned lines are employed in air-cooled motors. The fundamental design for the finned liner is shown below.
    Fins on the liner have been exposed air. If air is able to pass through the fins, it boosts the efficiency of heat transfer and helps cool the engine.
    The fin-cooled engines may also feature an wet liner, which can further enhance the rate of heat transfer. Liners are typically employed in engines where an engine has to be exposed the open air.
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