Cause Analysis of Cylinder Liner Wear_Yucheng Wantong Power Machinery Parts Co., Ltd

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Cause Analysis of Cylinder Liner Wear

2022-11-24 14:33

1) The lubrication conditions are not good, so that the upper part of the cylinder liner is severely worn. The upper part of the cylinder liner is adjacent to the combustion chamber, the temperature is very high, and the lubrication condition is very poor. The flushing and dilution of fresh air and unevaporated fuel aggravates the deterioration of the upper condition, making the cylinders in a state of dry friction or semi-dry friction, which is the cause of severe wear on the upper parts of the cylinders.

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2) The upper part bears a lot of pressure, so that the wear of the cylinder is heavy at the top and light at the bottom. The piston ring is pressed tightly against the cylinder wall under the action of its own elasticity and back pressure. The greater the positive pressure, the more difficult it is to form and maintain the lubricating oil film, and the mechanical wear will increase.
3) Mineral acid and organic acid corrode and peel off the cylinder surface. After the combustible mixture in the cylinder is combusted, water vapor and acidic oxides are produced. They dissolve in water to form mineral acids, and the organic acids generated during combustion will corrode the surface of the cylinder. The corrosion products are gradually scraped by the piston ring during friction. If it falls off, the cylinder liner will be deformed.
4) The entry of mechanical impurities aggravates the wear in the middle of the cylinder. Dust in the air, impurities in the lubricating oil, etc., enter between the piston and the cylinder wall to cause abrasive wear.

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