During use, the basic external conditions of bearing operation should be monitored frequently, such as temperature, vibration and noise measurement. These regular inspections will find potential problems as soon as possible and prevent unexpected machine stoppage, so that the production plan can be realized and the factory productivity and efficiency can be improved.
In the process of operation, the bearing requires correct re lubrication to perfect its performance. The lubrication methods of micro bearings are divided into grease lubrication and oil lubrication. In order to give full play to the function of the bearing, first of all, we should choose the lubrication method suitable for the use conditions and purposes. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing.
The accuracy grade of bearings is increased from grade 0, which is sufficient for general purposes, but when used in the conditions or occasions shown in Table 1, grade 5 or higher accuracy is required.
Although the above accuracy levels are based on ISO standards, their names are different in national standards.
The Accuracy grades applicable to various bearing types and the comparison between national standards are listed.
Dimensional accuracy (items related to shaft and Housing installation)
1. Allowable deviation of inner diameter, outer diameter, width and assembly width
2. Allowable deviation of inner and outer diameter of roller set
3. Allowable limit value of chamfer size
4. Allowable variation of width
Rotation accuracy (items related to the runout of the rotating body)
1. Allowable radial and axial runout of inner ring and outer ring
2. Allowable lateral runout of inner ring
3. Allowable variation of inclination of outer diameter surface
4. Allowable variation of thrust bearing raceway thickness
There are many sizes and forms of standard bearings. It is best to use standard bearings in the design of mechanical devices (considering whether the bearings are easy to purchase, as an aside, some models in the bearing catalogue do exist, but some non-standard bearings are not available in stock in Chinese Mainland, and sometimes the futures will take a long time, so the time cost and later replacement cost should be considered when selecting bearings), The nature, size and direction of the load applied to the bearing are variable. Generally, the rated base load is shown on the dimension table. However, axial load and radial load are also important factors in selecting suitable bearings. When the sizes of ball and needle roller bearings are equal, needle roller bearings usually have high load capacity and bear large vibration and impact loads.
