Main Shaft Bearing and Connecting Rod Bearing of Diesel Generator Set 1

Modern production and daily life are highly dependent on electricity. Most enterprises and high - rise buildings are equipped with diesel generator sets as backup power sources. Currently, the engine brands of diesel generator sets in the market usually include Perkins, Weichai, Cummins, Yuchai, Shangchai, etc. After long - term use, diesel generator sets inevitably require maintenance. As a complete set of equipment, diesel generator sets have numerous accessories. Many people may not be familiar with the main bearing shells and connecting rod bearing shells of diesel generator sets. As sliding bearings, the most common faults of main bearing shells and connecting rod bearing shells during use are the peeling or burning of the wear - resistant alloy layer and the early wear of the bearings.

If the bearing shells of a diesel generator are rapidly damaged or severely worn after a short - term operation, the cause usually does not lie in the bearing shells themselves, but is mainly due to poor operating conditions, poor - fitting parts, or improper technical conditions. A survey shows that 44.9% of bearing shell damages are caused by impurities, 13.4% by improper assembly, 12.7% by poor concentricity, 10.8% by poor lubrication, 9.5% by overloading, and the rest by corrosion and other factors.

During the starting and stopping processes of a diesel engine, the bearings are often in a critical lubrication state, which can cause the oil film to break and the friction surfaces to come into direct contact. Even when the diesel engine is running normally, due to factors such as unstable loads, it is difficult to maintain uniform and continuous liquid lubrication between the journal and the bearing. Additionally, if the sand and iron filings are not thoroughly removed during the assembly of a new diesel engine, dust and dirt can enter during operation, which is also a major cause of accelerated wear, bearing scoring, and burning.

The peeling of the bearing is mainly due to fatigue damage. Since the magnitude and direction of the load on the bearing change over time, when the load is unstable, a uniform and continuous oil film cannot be maintained between the friction surfaces of the bearing, and the pressure of the oil film also changes in a pulsating manner. At the minimum oil film thickness, high temperatures are generated in local areas of the bearing surface, greatly reducing the fatigue resistance of the alloy layer. Moreover, poor manufacturing and assembly of the bearing itself are also direct causes of alloy layer peeling.

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