Causes and prevention of cylinder liner cavitation in small loaders
Posted: Oct 21st, '24, 23:15
Cavitation damage of the cylinder block and cylinder liner of small loaders will cause cracks and even produce some through holes, which will lead to cooling water entering the cylinder and oil, significantly reducing the life and reliability of our diesel engine.
The main reason of cavitation is the vibration of cylinder liner. When the inner piston reaches the top dead center, the direction of the side pressure will change to a certain extent, and our piston will swing from one side of the cylinder liner to the opposite side, there will be a piston swing phenomenon.
Because there is a thermal gap between the piston and the cylinder liner, the swing of the piston is a certain impact. And this impact causes strong vibration of the cylinder liner.
When the liner wall vibrates, alternating stretching and compression occur in the water chamber, which creates local high pressure and vacuum bubbles in the water near the outer wall.
Under the action of high vacuum, the cooling water evaporates into bubbles, and some vacuum bubbles and bubbles occur in the tiny pinholes on the outer wall of the cylinder liner, or are squeezed into the pinholes under the action of vibration. When the vacuum bubble or bubble is ruptured by high pressure impact, the pressure shock wave is generated near the rupture zone, its pressure can reach tens of atmospheres and impact the outer wall of the cylinder, so frequent repeated impact, the cylinder liner surface is sharply damaged.
In order to prevent cavitation, the commonly used methods are: reduce the gap between the cylinder and the piston, so as to reduce the vibration of the cylinder liner; Adopt long piston skirt part; Increase the flow rate of cooling water, improve the flow direction and the structure of cooling system; Increase the support stiffness of cylinder liner; The material and process of cylinder liner should be improved to improve its cavitation resistance and so on.
for more info just visit our website at www.bonovogroup.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com
The main reason of cavitation is the vibration of cylinder liner. When the inner piston reaches the top dead center, the direction of the side pressure will change to a certain extent, and our piston will swing from one side of the cylinder liner to the opposite side, there will be a piston swing phenomenon.
Because there is a thermal gap between the piston and the cylinder liner, the swing of the piston is a certain impact. And this impact causes strong vibration of the cylinder liner.
When the liner wall vibrates, alternating stretching and compression occur in the water chamber, which creates local high pressure and vacuum bubbles in the water near the outer wall.
Under the action of high vacuum, the cooling water evaporates into bubbles, and some vacuum bubbles and bubbles occur in the tiny pinholes on the outer wall of the cylinder liner, or are squeezed into the pinholes under the action of vibration. When the vacuum bubble or bubble is ruptured by high pressure impact, the pressure shock wave is generated near the rupture zone, its pressure can reach tens of atmospheres and impact the outer wall of the cylinder, so frequent repeated impact, the cylinder liner surface is sharply damaged.
In order to prevent cavitation, the commonly used methods are: reduce the gap between the cylinder and the piston, so as to reduce the vibration of the cylinder liner; Adopt long piston skirt part; Increase the flow rate of cooling water, improve the flow direction and the structure of cooling system; Increase the support stiffness of cylinder liner; The material and process of cylinder liner should be improved to improve its cavitation resistance and so on.
for more info just visit our website at www.bonovogroup.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com