Selection of clearance of deep groove ball bearings

Selection of deep groove ball bearing clearance: When purchasing deep groove ball bearings, users generally only tell what model and grade they are in, and rarely make requirements for the clearance of deep groove ball bearings. Business personnel must ask about the use conditions of deep groove ball bearings, among which the speed, temperature, and fit tolerance of deep groove ball bearings are directly related to the selection of deep groove ball bearing clearance. Generally, motors with speeds below 3500 rpm mostly use CM clearance, while high-temperature and high-speed motors require relatively large clearance.
The clearance of deep groove ball bearings will decrease after assembly due to the expansion of the inner hole and the reduction of the outer circle. The reduction in clearance = interference × 60% (except for deep groove ball bearings with aluminum chambers). For example, if the clearance of the deep groove ball bearing before assembly is 0.01mm and the interference during assembly is 0.01mm, the clearance of the deep groove ball bearing after assembly is 0.004mm. In theory, the noise and life of deep groove ball bearings are in the best state when the clearance is zero, but in actual operation, considering the temperature rise and other issues, the clearance of deep groove ball bearings after assembly is preferably 0.002mm-0.004mm.
Grease selection: Grease is generally selected based on the speed, temperature resistance, noise requirements and starting torque of deep groove ball bearings, requiring business personnel to have a good understanding of the performance of various greases.