The engine cylinder sleeve and the piston ring are a pair of friction pairs in the case of high temperature, high pressure, alternating load and corrosion. Long term in the complex and changeable situation, the result is caused by the cylinder liner wear deformation, which affects the engine power, economy and service life. It is very important to analyze the reason of the cylinder liner wear deformation and to improve the economic performance of the engine.
Analysis of the reasons for the wear of cylinder liner
The working environment of the cylinder liner is very poor, and there are many reasons for the wear. Usually due to structural reasons allow normal wear and tear, but improper use and maintenance, it will cause non normal wear and tear.
1 structural causes of wear and tear
1) lubrication condition is not good, make the cylinder liner wear serious. The upper part of the cylinder jacket is adjacent to the combustion chamber, the temperature is very high, and the lubrication condition is very poor. Fresh air and non evaporated fuel are washed and diluted, which aggravate the deterioration of the upper conditions, so that the cylinder is in a dry or semi dry friction state, which is the cause of the serious wear of the cylinder.
2) the upper bearing pressure, so that the cylinder wear and tear on the weight of light. In the spring and back pressure under the action of pressure in the cylinder wall tight piston ring is more pressure, oil film formation and maintenance more difficult, mechanical wear. In the process of work, with the piston down, the pressure is gradually reduced, and thus the cylinder wear is heavy and light.
3) mineral acids and organic acids to cause corrosion and spalling of the surface of the cylinder. The combustible mixture in cylinder combustion, produce water vapor and acid oxide dissolved in water, they generate mineral acid, organic acid generated in combustion and the corrosive effect on the cylinder surface, corrosion gradually by the piston ring scrape in friction, resulting in deformation of the cylinder sets.
4) into the mechanical impurities, so that the central cylinder wear. The dust in the air, the impurity in the lubricating oil, into the piston and cylinder wall caused by abrasive wear. The dust or impurities in the piston in the cylinder reciprocating motion, due to the central position in the central position of the largest movement, it is exacerbated by the middle of the cylinder wear.
2 improper use of wear
1) oil filter filtration effect is poor. If the oil filter does not work properly, the lubricating oil are not effectively filter, lubricating oil contains a lot of hard particle will make the cylinder wear is intensified.
2) Baotou beiben heavy truck parts air filter filtration efficiency is low. The air filter is to remove the dust and sand from the air entering the cylinder to reduce the wear of the cylinder, piston and piston rings. Experiments show that if the engine does not contain air filter, the wear of the cylinder will increase 6-8 times. The air cleaner is not a long-term cleaning and maintenance, cleaning effect is poor, the cylinder liner wear will accelerate.
3) long time low temperature operation. Long period of low temperature operation, one is caused by poor combustion, carbon accumulation from the upper part of the cylinder jacket began to spread, so that the upper part of the cylinder liner to produce serious abrasive wear; two is caused by electrochemical corrosion.
4) often use inferior lubricating oil. Some owners to save money, often at the roadside shop to buy or sell illegal oil inferior oil, resulting in strong corrosion of the upper cylinder, the wear volume is 1-2 times larger than the normal value.
3 wear and tear caused by improper maintenance
1) Baotou beiben heavy truck parts cylinder improper installation position. When installing the cylinder liner, if there is an error, the cylinder center line and the crankshaft axis is not perpendicular, will cause the cylinder liner is not normal wear and tear.
2) the hole deviation of the connecting rod of the connecting rod. In the process of repair, reaming connecting rod copper sleeve, reamer tilt caused by deflection of connecting rod copper sleeve hole, a piston pin connecting rod center line and the center line is not parallel, forcing the piston to the cylinder liner a side tilt, can also cause abnormal wear cylinder liner.
3) Baotou beiben heavy truck parts connecting rod bending deformation. Because of the car accident or other reasons, the impact of the connecting rod will produce bending deformation, if not timely correction and continue to use, will accelerate the wear of the cylinder liner.

4) the crankshaft connecting rod journal is not parallel to the principal axis. Because of burning tile and other reasons, the crankshaft will be deformed due to severe impact, if not timely correction and continue to use, the same will accelerate the cylinder liner wear.
Two, to reduce the wear of the cylinder liner
1 right start and start
When the engine is cold, the temperature is low, the oil viscosity is big, the flow is poor, so that the oil pump is insufficient. At the same time, the original wall of oil in the parking along the cylinder walls dirty, so in the starting moment of lubrication is not the normal work as well, resulting in the starting cylinder wear increase greatly. Therefore, the initial start, should first make the engine idling a few laps to get lubrication friction surface after starting. After starting the heating should be idle, no Meng oil outlet, start again until the oil temperature reached 40 degrees; the start should adhere to hang low gear and sequential each gear driving a mileage, until the temperature is normal, can be turned into normal running.
2 proper selection of lubricating oil
To strictly in accordance with the requirements of the season and the engine performance requirements for the use of the best viscosity of the lubricating oil, can not be purchased with poor quality lubricating oil, and often check and maintain the quantity and quality of lubricating oil.
3 to strengthen the maintenance of the filter
The air filter, oil filter and fuel filter to maintain a good working state, to reduce the wear of the cylinder liner is essential. Strengthen the “three” maintenance, is to prevent the mechanical impurities into the cylinder, reduce cylinder wear, prolong the service life of the engine is one of the important measures, is particularly important in rural and wind areas. In order to save fuel, some drivers don’t install the air filter.
4 maintain the normal operating temperature of the engine
The normal operating temperature of the engine should be at 80-90. The temperature is too low, can’t keep good lubrication, will increase the wear of the cylinder wall, cylinder water vapor condenses into water, acidic gas molecules dissolved in waste gas, formation of acidic substances, so that the cylinder subjected to corrosive wear. Experiments show that when the cylinder temperature from 90 degrees to 50 degrees, cylinder wear for 4 times at 90. The temperature is too high, the strength of the cylinder will be reduced and increased wear and tear, and even may cause excessive expansion of the piston caused by “cylinder” accident.
5 improve the quality of warranty
In the use of the process, the timely detection of problems in a timely manner to be ruled out, at any time to replace or repair the damaged and deformed parts. Install the cylinder liner beiben heavy truck fittings according to the strict technical requirements of inspection and assembly. In guarantee for ring assignments, to choose the proper elasticity piston ring, tension is too small, so that the gas into the crankcase blow down the walls of the cylinder oil, increasing cylinder wall wear; elastic is too large, directly aggravate the wear of the cylinder walls, or because of the cylinder wall oil film is destroyed and aggravate the wear.