The selection of fits is usually carried out according to the following principles. Based on the direction, nature of the load acting on the bearing, and whether the inner or outer ring rotates, the load on each bearing race can be divided into rotating load, stationary load, or undirected load. For the race that bears rotating loads or undirected loads, a static fit (interference fit) should be used. For the race that bears stationary loads, a transition fit or a loose fit (clearance fit) can be adopted.
When the bearing load is heavy or when it is subjected to vibration or impact loads, the interference must be increased. When using hollow shafts, thin-walled bearing housings, or lightweight alloy or plastic bearing housings, the amount of interference for cylindrical roller bearings also needs to be increased.
To maintain high-speed rotation, high-precision bearings must be used, and the dimensional accuracy of the shaft and bearing housing should be improved, avoiding excessive interference. If the interference is too large, the geometric shape accuracy of the shaft or bearing housing may affect the geometric shape of the bearing race, thereby impairing the rotational accuracy of the bearing.
For non-separable bearings (such as deep groove ball bearings), if both the inner and outer rings use a static fit, installation and removal of the bearing will be extremely inconvenient. It is best to use a loose fit for one of the inner or outer rings.
SKF Bearings: 61848, 16048MA, 16052MA