In general, with the correct use of timken bearings, fatigue life can be achieved. But in the event of accidental early damage, it can no longer be used. Unlike fatigue life, this early damage is called a failure or accident. Most of them are caused by poor consideration of installation, use, and lubrication, foreign matter intruding from the outside, or insufficient research on shafts and bearing housings. The damage state of the bearing, such as the abrasion of the ring rib of the roller bearing, may be caused by insufficient lubricant, inappropriate grade, defective oil supply and discharge structure, foreign matter intrusion, bearing installation error or excessive deflection of the shaft. It may also be caused by a combination of the above reasons. Therefore, it is difficult to know the real cause of the damage only by investigating the bearing damage. However, on the basis of fully understanding the machine, working conditions and peripheral structure of the timken bearing, clarifying the situation before and after the failure, and then analyzing the damage of the bearing and various related reasons, it is possible to prevent similar failures from happening again. . Representative bearing damage causes and countermeasures. Even cylindrical roller bearing parts are machined using the most advanced manufacturing techniques of the day. See how its readings change with preload. The preload method has its disadvantages, which are well known. Its working surface will always have the dial indicator against the appropriate part of the bearing end face or shaft. 1. When the mechanical damage is serious, metal peeling and large-scale messy scratches occur on the contact surface; in general, the mechanical damage of cylindrical roller bearings refers to the appearance of groove marks at different levels on the alloy surface of the bearing bush. The main reason for the mechanical damage of the bearing due to the coexistence of contact surface damage and ablation is that it is difficult to form an oil film on the surface of the timken bearing or the oil film is severely damaged. 2. Plastic deformation and cold work hardening occur in the outer surface of the bearing cavity, and the sliding bearing is repeatedly subjected to the impact load of the cylinder pressure. The deformability is lost locally, and lines are gradually formed and continuously expanded. Then, as the wear debris falls off, the loaded outer layer forms holes. Generally, when the bearing bush is cavitated, the pit first appears, and then the pit gradually expands and causes the cracking of the alloy layer interface. The crack expands along the parallel direction of the interface until it peels off. The main cause of cavitation in sliding bearings is that the oil flow is strongly turbulent due to the sudden change of the cross section of structural elements such as oil grooves and oil holes, and bubbles are formed in the vacuum area where the oil flow is turbulent. Cavitation generally occurs in high load areas of the bearing, such as the lower bearing pad of the crankshaft main bearing. 3. Fatigue pitting Due to the overloaded work of the engine, the fatigue pitting of cylindrical roller bearings refers to. The timken bearing is overheated and the bearing clearance is too large, resulting in fatigue damage, fatigue pitting or fatigue shedding in the middle of the bearing. Most of this damage is caused by overloading, excessive bearing clearance, or dirty lubricating oil and foreign matter mixed in it. Therefore, care should be taken to prevent the bearing from overloading and do not operate at a too low or too high speed; adjust the engine to a stable state when idling; ensure normal bearing clearance to prevent the engine from being too high or too low; check and adjust the cooling The working conditions of the system ensure that the working temperature of the engine is suitable. 4. Bearing alloy corrosion The chemical impurities (acid oxides, etc.) in the lubricating oil oxidize the bearing alloy to generate acid substances, and the bearing alloy corrosion is generally caused by the impure lubricating oil. Causes the bearing alloy to fall off locally, forming irregular tiny cracks or small pits. The main reasons for bearing alloy corrosion are improper selection of lubricating oil, poor corrosion resistance of timken bearing materials, or rough engine operation and high temperature. 5. The bearing is smelted to form a local high temperature, and there is a direct contact with a tiny raised metal surface between the journal and the bearing friction pair. In the case of lack of lubrication and poor cooling, the bearing alloy will be blackened or partially melted. This fault is often caused by the too tight fit between the journal and the bearing; the lack of lubricating oil pressure can also easily cause the bearing to burn out.
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