Xikai Ou explained with spherical bearings

Bearing clearance:

The radial clearance of a cylindrical bore ball bearing with a seat bearing uses the radial clearance of a deep groove ball bearing. Cone hole ball bearings. Considering the inner ring expansion due to the sleeve, the normal clearance value is the same value as the C3 clearance of the cylindrical bore ball bearing.

Recommended with:

The recommended fittings for bearing inner rings and shafts with ball bearings facing the ball bearings are shown in the table.

Table: Bearings with housings Bearings for inner rings and shafts Types of use Conditions of use Tolerance of the shaft Domain Rating Remarks General h7,h8,js7,j7 Cylindrical bore bearings Displacement of the shaft from the inner diameter mating face h7,h8 on the shaft The keyway, using the head stop screw, has a large load, withstands vibration shock (1) k6, k7, m6 Conical hole bearing adapter sleeve mounting h9 shaft roundness tolerance and cylindricity tolerance is IT6 Note (1) In particular In the case of impact, the tolerance field grade of the ball bearing inner diameter of the bearing seat also needs to use j7 (j6) or k7 (k6)

Remarks: In any case where the shaft expands and contracts greatly, it is necessary to consider the free side and use the fixed side separately.

Permissible alignment angle:

Permissible aligning angles for the ball bearings facing the ball bearings are allowed to be around 5° to 6° without installation of surrounding restrictions. However, for bearings that need to be replenished with grease, if the centering angle exceeds 2° to 3°, it will be difficult to replenish the grease. Therefore, it is preferably 2° or less.

In addition, the covered bearing with the cover, the rubber seal lip of the cover and the shaft are not evenly contacted, so the alignment angle should be within 1°.