As the main and connecting rod bearing, the most common faults in use is wear-resistant alloy layer peeling or burning, and bearing early wear. If the diesel engine after short-term operation, the bearing surface that quickly damage or serious wear, the reasons are not in the bearing itself, which is mainly due to the use of conditions or with the parts or technical condition caused by poor. There’s a show in the investigation materials, 44.9% cause bearing damage is caused by impurities, 13.4% is the assembly is bad, 12.7% is the concentricity of 10.8% is too poor, poor lubrication, overload is 9.5%, the rest are other factors such as corrosion.
In the process of starting and stopping of diesel engine, the bearing parts of Baotou North Benz parts are often in a state of critical lubrication. Even if the diesel engine is in normal operation, due to the instability of the load and other factors, the journal and the bearing is also difficult to maintain uniform and uninterrupted liquid lubrication. In addition, the new diesel engines failed to completely remove the sand and iron filings in the assembly, can enter the dust and dirt in the process of operation, but also accelerated wear, mainly caused by the tile burning lava.
Baotou North Benz parts bearing spalling is mainly due to fatigue damage. Because the size and direction of the load of the bearing vary with time, when the load is unstable, the bearing friction surface can not maintain a uniform and continuous oil film, and the pressure of the oil film is also fluctuating. When the minimum oil film thickness, high temperature in the local area of the bearing surface, greatly reduce the fatigue strength of the alloy layer. In addition, the bearing itself manufacturing assembly is not bad, but also the direct cause of the alloy layer peeling.
In addition to wear and spalling, the corrosion of sliding bearings is also a matter of concern, depending on the quality of the oil, temperature, pressure and bearing load. The high load part of the bearing is the most prone to corrosion, and the deterioration of the lubricating oil at high temperature and the formation of organic acids and sulfides is the direct cause of bearing corrosion. Baotou North Benz accessories bearing damage, that is usually called “burnt”, the main reason is that the gap is too small, poor lubrication and operation problems.