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What are the characteristics of the wear process of cylinder liners?

2016-08-15


To the normal technical condition, because with the parts fit well, lubrication conditions are improved, in a longer working time, wear is slow and uniform. When due to wear and cylinder gap more than a certain value, due to the gas and oil leakage and moving parts of the knock and other factors, wear and increase.

Cylinder liner along the height direction of each wear is not the same, the size of the wear and tear with the temperature, pressure and lubrication conditions and different changes. In the case of normal wear, the wear occurs near the point where the gas ring is located when the piston is at the upper stop. Because of the high temperature here, poor lubrication conditions, the metal wear resistance is reduced, and because of the role of gas, the piston on the cylinder liner wall pressure is also large. The middle of the cylinder liner oil film is richer, can maintain more favorable lubrication conditions, protect the cylinder liner from serious wear and corrosion, thus the wear is relatively small. Piston in the lower stop near the location, due to the low sliding speed, oil film is not easy to form, the cylinder liner wear is also slightly larger than the middle.

Because of the use of poor maintenance or other artificial reasons, can make the cylinder liner in a short period of time a lot of wear, called abnormal wear. For example, when the air filter efficiency or short circuit when the wear and tear; when the oil filter poor or degradation of pollution caused by wear and tear.

Corrosion wear occurs when the diesel engine uses high sulphur fuel or starts frequently at low temperatures. The piston ring is subjected to strong acid corrosion in the position near the upper stop, and the wear is 1 to 2 times greater than normal wear. This time the middle of the wear also increased 4 to 6 times, mainly due to corrosion flaking metal particles caused by abrasive wear and tear.

From the above, to extend the service life of the cylinder liner, we strictly abide by the operating procedures, careful maintenance, eliminate all factors that may cause abnormal wear. In particular, we need to keep the filter, with oil off, to do oil net air net.

2016/08/15

Factors to consider when choosing a diesel engine

the use of diesel engines. For frequent starting and often moving machinery, such as tractors, agricultural vehicles, mobile power stations, etc., can choose light high-speed diesel engine; for fixed power devices, such as agricultural irrigation and drainage, agricultural by-products processing machinery supporting power, you can choose a lower speed and the potential of a larger diesel engine. At the same time, for agricultural power, most of the time long-term continuous operation, so good economy is very important.

2016/08/15

What are the characteristics of the wear process of cylinder liners?

To the normal technical condition, because with the parts fit well, lubrication conditions are improved, in a longer working time, wear is slow and uniform. When due to wear and cylinder gap more than a certain value, due to the gas and oil leakage and moving parts of the knock and other factors, wear and increase.

2016/08/15

Basic requirements for diesel engines

Basic requirements for diesel engines

This question concerns how to evaluate the diesel engine. With the development of socialist construction cause, China's diesel engine models continue to increase, the performance indicators gradually improve and enhance. At present, the domestic civilian diesel engine has more than one hundred kinds, there is a comprehensive use of high degree of general models, but also for special purposes of special models. In this case, how to correctly evaluate, reasonable choice of diesel engine is a very important issue.