1. Oil-free sliding bearings also need to be maintained when they are in use

In engines, we often use a variety of bearings. There are many types of bearings. Now, different bearings have different functions and different functions. When in use, the engine's bearings should also be maintained. In order to avoid various problems with our bearings, we must understand the causes of bearing damage and solve them. Poor lubrication: the engine will run at high speed immediately after starting. Improper selection of lubricating oil, insufficient filling, failure to change in time according to seasonal changes, and deterioration of lubricating oil. Impurities mixed in the lubricating oil: If impurities enter the lubricating oil during the operation of the engine, it will cause the alloy layer of the sliding bearing to wear. Bearings are an indispensable part of the engine, and we must pay attention to maintenance during use, so that we can use our bearings. Now, as our technology develops faster and faster, the functions of the bearings will also be better. good.

2. The bearing temperature is too high

When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When touching the housing of the mechanism with your hand, it should be normal if you don’t feel hot, otherwise it indicates that the bearing temperature is too high.。   

The reasons for the excessively high bearing temperature include: the quality of the lubricant does not meet the requirements or deterioration, the viscosity of the lubricant is too high; the mechanism assembly is too tight (insufficient clearance); the bearing assembly is too tight; the bearing race rotates on the shaft or in the housing; Large; bearing cage or rolling element chipping, etc.

3. Bearing noise

Rolling bearings are allowed to have a slight running noise during work. If the noise is too loud or there is abnormal noise or impact, it indicates that the bearing is faulty. The causes of noise produced by rolling bearings are more complicated. One is the wear of the mating surfaces of the inner and outer rings of the bearing. Due to this kind of wear, the matching relationship between the bearing and the housing, and the bearing and the shaft is destroyed, causing the axis to deviate from the correct position, causing abnormal noise when the shaft is moving at high speed. When the bearing is fatigued, the metal on its surface will peel off, which will also increase the radial clearance of the bearing and produce abnormal noise. In addition, insufficient bearing lubrication, formation of dry friction, and bearing breakage will cause abnormal noise. After the bearing is worn and loosened, the cage is loosened and damaged, and abnormal noise will also be produced.

4. Bearing damage

When the rolling bearing is disassembled and inspected, the fault and the cause of the damage can be judged according to the damage of the bearing.   

1. The metal peeling off the surface of the raceway   

The rolling elements of the bearing and the inner and outer ring raceways are all subjected to periodic pulsating loads, resulting in periodic contact stresses. When the number of stress cycles reaches a certain value, fatigue spalling occurs on the working surfaces of the rolling elements or inner and outer ring raceways. If the bearing load is too large, this fatigue will be aggravated. In addition, if the bearing is installed incorrectly and the shaft is bent, the raceway will peel off.   

Fatigue spalling of the bearing raceway will reduce the running accuracy of the shaft and cause vibration and noise to the mechanism.   

2. Bearing burns   

Burnt bearings have tempered colors on raceways and rolling elements. The causes of burns are generally insufficient lubrication, the quality of the lubricating oil does not meet the requirements or deterioration, and the bearing assembly is too tight.   

3. Plastic deformation