Relative to the rotation of the sleeve, the loads on the bearing sleeve are divided into local loads, cyclic loads and swing loads. For ordinary cyclic loads (rotational loads), swing loads are tightly assembled; for local loads, tight fits are usually not used unless there is a special purpose. When bearing a large load, both the inner and outer rings need to be interference fit, but sometimes the outer ring can be slightly loose and can swing axially in the outer shell hole of the bearing seat; when bearing a swing load and a light load, a slightly looser fit can be selected.

1. Load specifications

The interference between the bearing sleeve and the shaft or housing hole in the products wholesaled by the head bowl bearing manufacturer is determined by the load size. When the load is concentrated, a larger interference should be selected; when the load is light, a smaller interference fit should be adopted. When P<0.07 C, it is usually a lighter load, and when P is greater than 0.07 C, it is less than 0.15℃ is a normal load, and P is greater than 0. At 15°C, the main load (C is the rated dynamic load of the bearing).

2. Operating temperature

During the operation of the bearing, the temperature of the ring is often higher than that of the adjacent parts. Therefore, the inner ring of the customized head cup bearing of the card type may loosen with the shaft due to thermal expansion, and the outer ring may affect the axial shaking of the bearing in the housing hole due to thermal expansion. When selecting the fit, the temperature difference and expansion and contraction of the bearing equipment should be taken into account. When the temperature difference is large, the interference fit between the shaft and the inner ring should be larger.

3. Rotation accuracy

When there is a high rotation accuracy requirement for the bearing, in order to eliminate the influence of elastic deformation and vibration, the use of clearance fit should be avoided.

The structure and material of the bearing housing hole.

For the outer ring of the bearing, the customized motorcycle head bowl bearing should not be fitted with an interference fit, nor should the outer ring be allowed to rotate in the housing hole. For bearings installed in thin-walled housing holes, light metal housing holes or hollow shafts, a tighter fit should be used than for thick-walled housing holes, cast iron housing holes or solid shafts.