Effective gap or working gap refers to the actual gap in rolling bearings when the rolling bearings are installed on the host and under a certain load to reach a certain temperature rise state. Obviously, the effective gap is smaller than the work clearance. The original gap of the rolling bearing refers to the gap in a free state after the scroll bearing is installed in front of the machine. In fact, it is difficult to know that the original gap is not measured. Therefore, the original gap is often replaced by testing the gap.
Rolling bearing circles and rolling bodies usually use high -carbon chromium bearing steel. Most of the bearings use suj2 in the JIS steel species. Large bearing uses suj3. SUJ2's chemical ingredients, in countries around the world, have been specified as imported bearing materials. For example:: AISL52100 (United States), DIN100CR6 (West Germany), BS535A99 (UK), etc. are the same steel.
The rolling bearing sleeve and rolling body repeatedly withstand high contact pressure on the one hand, and accompanied by sliding rolling contact on the one hand. The holder, one side with the two sides of the sleeve and the rolling body, or a sliding contact with one side, to withstand the tension and compression force. Therefore, the performance of the rolling body and the material, performance, and the main requirements for the rolling bodies and maintenance materials, the performance of the rolling shelf, the performance required by the imported bearings, and the rolling body materials: high rolling fatigue strength, high hardness, and high massage resistance.