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Five considerations in bearing operation

Precautions when using deep groove ball bearings


Mechanical damage

In severe cases, metal peeling occurs on the touch surface and a large area of messy scratches occur; usually, mechanical bearing damage means that the alloy surface of the bearing pad shows different levels of groove marks. The main reason for the damage of the touch surface and the ablation phenomenon is that the bearing mechanical damage is difficult to form an oil film on the bearing surface or the oil film is severely damaged.


2. Bearing Cavitation

The surface layer undergoes plastic deformation and cold work hardening, and the sliding bearing is under the repeated effect of cylinder pressure shock load. Part of the deformation ability is lost, gradually forming lines and continuously expanding, and then following the falling of the wear debris, the load surface layer forms a cavity. Generally, when the bearing bush is pitted, it first presents a pit, and then the pit gradually expands and causes cracking at the interface of the alloy layer. The crack expands along the parallel direction of the interface until the drop stops. The main reason for the sliding bearing cavitation is that the cross section of the layout elements such as oil grooves and oil holes suddenly changed, resulting in drastic imbalance of the oil flow. The vacuum area of the oil flow imbalance formed bubbles, and then the cavitation occurred due to the increase in pressure and bubble collapse. Cavitation usually occurs in high-load areas of bearings, such as the lower bearing pads of crankshaft main bearings.


3. tired pitting

Because the engine is overloaded, the fatigue pitting of the bearing means. The bearing operation is overheated and the bearing gap is too large, which constitutes fatigue damage to the middle part of the bearing, fatigue pitting, or fatigue drop. Most of this damage is caused by overload, bearing gap is too large, maybe the smooth oil is not clean, and foreign matter is mixed inside. Therefore, when using it, you should pay attention to avoid bearing overload operations and not operate at too low or too high speed; adjust the engine to a stable condition when idling; ensure normal bearing clearances to avoid engine speed is too high or too low; check, adjust cooling The operating conditions of the system ensure that the operating temperature of the engine is suitable.


4. Bearing alloy corrosion

The chemical impurities (acid oxides, etc.) contained in the smooth oil oxidize the bearing alloy to generate acidic materials. The corrosion of the bearing alloy is usually due to the impure smooth oil. Causes the bearing alloy to fall, forming irregular fine cracks or pits. The main reason for bearing alloy corrosion is improper selection of smooth oil, poor bearing material corrosion resistance, and perhaps rough engine operation and excessive temperature.


5.Bearing melting

The component part is high temperature, and there is a small raised metal surface between the journal and the bearing conflict pair to touch directly. In the case of lack of smoothness and poor cooling, the bearing alloy is blackened or partially melted. This problem is usually caused by the too tight cooperation between the journal and the bearing; the lack of smooth oil pressure also simply causes the bearing to burn.


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