The burning of bearings is caused by the tin alloy layer of the main bearing or connecting rod of the diesel generator set, which is caused by the dry friction with the journal due to the deterioration of lubrication conditions, resulting in the melting of the high-temperature surface and sintering with the crankshaft journal.
The mechanism of the burning bearing failure is analyzed, and there are several reasons:
1. Oil deterioration. Oil deterioration is generally caused by cooling water and fuel leaking into the oil pan. In addition, poor atomization of the injector and frequent throttle when the engine is working will also cause the diesel engine to not burn completely, causing oil deterioration.
2. Impurities such as sand and metal chips entering the oil channel cause burning bearings. Damage to the oil pump causes the oil supply to stop, the bearing quality is unqualified, the fit between the journal and the bearing changes, the oil channel is blocked, the lubricating oil cannot be delivered to the friction point, and insufficient oil pressure will cause burning bearings. Oil leakage is an important cause of insufficient oil pressure.
3. The oil level is too low. When the tractor goes uphill, accelerates or brakes, the oil filter may be exposed, and the air intake surface cannot be supplied with oil. If the operator fails to find that the oil pressure has disappeared in time and continues to drive, it will immediately cause the bearing to burn.
4. Other reasons such as wrong use of oil, frequent overloading resulting in excessive load or over-tightening of the oil pressure limiting valve bolts, resulting in excessive oil pressure, and long-term low-load operation may also cause bearing to burn. Operators should pay attention to avoid this when using and maintaining diesel engines to reduce the occurrence of failures.
