The main factors affecting the dynamic load capacity of bearings

1. The influence of material. Due to different smelting methods, the size, distribution and content of inclusions in bearing steel are also different. This difference in material will have a favorable or unfavorable effect on the bearing's load capacity. The basic rated dynamic loads of bearings listed in the bearing size and performance table are all based on vacuum degassed bearing steel as the basic material. If ordinary electric furnace bearing steel is used, the load capacity of the bearing will decrease to varying degrees. On the contrary, if bearing steel or other equivalent steel materials smelted by methods such as vacuum remelting and electroslag remelting are used, the load capacity of the bearing will be improved to varying degrees.

2. The influence of temperature. The operating temperature that general bearings can withstand can reach 120C. For working conditions exceeding this limit temperature, bearings made of special (stable) heat treatment or special (heat-resistant) materials should be used.

If the bearing is often used at a temperature above 120C, or when used at extremely high temperatures for a very short time, the bearing's organization will change, resulting in a reduction in the bearing's load capacity.

3. The influence of hardness. The surface hardness of bearing parts is generally 60~65HRC. However, in some applications, the actual hardness is lower than the specified range. For example, high-temperature bearings that have undergone high-temperature tempering treatment, certain needle roller bearings that directly use the journal and bearing box hole as raceways, etc. The reduction of the surface hardness of the bearing material, especially when it drops below 58HRC, will lead to a corresponding reduction in the bearing's load capacity.