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Selection of clearance of deep groove ball bearing

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Selection of clearance of deep groove ball bearing: when purchasing deep groove ball bearing, users will only tell what model and grade they are in, and rarely put forward requirements for clearance of deep groove ball bearing. Business personnel must ask about the service conditions of deep groove ball bearing, among which, speed, temperature and fitting tolerance of deep groove ball bearing are directly related to the selection of clearance of deep groove ball bearing. Generally, CM clearance is adopted for motors with speed below 3500 rpm, and relatively large clearance is required for high-temperature and high-speed motors.

After assembly, the clearance of deep groove ball bearing will be reduced due to the enlargement of inner hole and the reduction of outer circle. The reduction of clearance = interference amount × 60% (except that the deep groove ball bearing chamber is aluminum). For example, the clearance of deep groove ball bearing before assembly is 0.01mm, and the interference is 0.01mm during assembly, then the clearance of deep groove ball bearing after assembly is 0.004mm. Theoretically, the noise and life of the deep groove ball bearing reach the best state when the clearance is zero. However, considering the temperature rise and other problems in the actual operation, the clearance of the deep groove ball bearing after assembly is 0.002mm-0.004mm.


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