Selection of rolling bearings

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(1) Effective space: In mechanical design, the shaft journals are generally determined first, after which bearings are selected. The shaft journals serve as an important basis for choosing bearings; once the bearings have been selected, dynamic analysis is conducted on both the bearings and the shaft to verify their service life and mechanical properties. Generally, when the journal size is small, a ball bearing is chosen ； When the journal size is large, select a roller bearing. (2) Load capacity: The load capacity of rolling bearings is related to the type and size of the bearings. Under the same size and shape, the load-carrying capacity of roller bearings is approximately 1.5 to 3 times that of ball bearings. Centrifugal bearings mainly bear radial loads. Thrust bearings mainly bear axial loads. Angular contact ball bearings can withstand both radial and axial loads, and their capacity to handle axial loads increases as the contact angle increases. (3) Speed characteristics: Generally speaking, deep groove and angular contact ball bearings, as well as cylindrical roller bearings, have higher limiting speeds. When the inner diameter of the bearing is the same, the smaller the outer diameter, the smaller and lighter the rolling elements become; as a result, the centrifugal force during operation is reduced, making it more suitable for high-speed operation. Therefore, at high speeds, ultra-light, extra-light, and light series bearings should be selected. The limit speed of thrust bearings is relatively low. (4) Friction characteristics: Generally speaking, ball bearings experience less friction than roller bearings