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Wear caused by the structure of the engine cylinder liner

2021-03-29

The working environment of the cylinder liner is very harsh, and there are many reasons for the wear. Normal wear is usually allowed due to structural reasons, but improper use and maintenance will cause abnormal wear such as abrasive wear, fusion wear and corrosion wear.

1. Poor lubrication conditions cause serious wear on the upper part of the cylinder

The upper part of the cylinder liner is close to the combustion chamber, the temperature is high, and the lubrication strip price difference. The flushing and dilution of fresh air and unevaporated fuel aggravated the deterioration of the upper conditions. During the period, they were in dry friction or semi-dry friction. This is the cause of serious wear on the upper part of the cylinder.

2 The acidic working environment causes chemical corrosion, which makes the surface of the cylinder liner corrode and peel off

After the combustible mixture in the cylinder is burned, water vapor and acidic oxides are produced. They dissolve in water to generate mineral acid. Together with the organic acid generated during combustion, the cylinder liner always works in an acidic environment, causing corrosion on the cylinder surface. , Corrosion is gradually scraped off by the piston ring during friction, causing deformation of the cylinder liner.

3 Objective reasons lead to the entry of mechanical impurities in the cylinder, which intensifies the wear of the middle of the cylinder liner

Due to the principle of the engine and the working environment, dust in the air and impurities in the lubricating oil enter the cylinder, causing abrasive wear between the piston and the cylinder wall. When dust or impurities move back and forth with the piston in the cylinder, the movement speed of the part in the cylinder is the highest, which intensifies the wear in the middle of the cylinder.