Selection of clearance of deep groove ball bearing

Selection of clearance of deep groove ball bearings: When purchasing deep groove ball bearings, users usually only tell what model and grade they are in, but rarely ask for clearance of deep groove ball bearings. The business personnel must ask about the service conditions of deep groove ball bearings, in which the speed, temperature and fit tolerance of deep groove ball bearings are directly related to the selection of clearance of deep groove ball bearings. Generally, the motor with the speed below 3500 rpm mostly adopts CM clearance. For example, high-temperature high-speed motor requires relatively large clearance. After assembly, the clearance of deep groove ball bearing will be reduced due to the expansion of inner hole and the reduction of outer circle. The reduction of clearance=interference × 60% (except that the deep groove ball bearing chamber is aluminum). For example, if the clearance before assembly of deep groove ball bearing is 0.01mm, and the interference during assembly is 0.01mm, the clearance after assembly of deep groove ball bearing is 0.004mm. Theoretically, the noise and service life of deep groove ball bearing reach a better state when the clearance is zero. However, considering the temperature rise in actual operation, it is better that the clearance of deep groove ball bearing is 0.002mm-0.004mm after assembly. Selection of grease: The selection of grease is generally based on the speed, temperature resistance, noise requirements, starting torque and other aspects of deep groove ball bearings. The business personnel are required to have a good understanding of the performance of various grease.