How to Fit Tapered Roller Bearing Accuracy Design

Jul 05, 2021

1. Under normal circumstances, the tapered roller bearing will use the base hole system when fitting, but if it is a standard part, the matching nature of the parts that match it is determined by the standard part. As for the tapered roller bearing, since it is a standard part, the part matching the outer ring is made of base shaft, and the shaft matching the inner ring is made of base hole.

The fit of the bearing inner ring and the shaft is made of base holes, although the tolerance bands of all tolerance grades of the tapered roller bearing inner ring are below the zero line and the upper deviation is zero. The main reason is the special requirements for bearing coordination. In most cases, the inner hole of the bearing should rotate with the shaft, and the fit between the two must have a certain interference.

2. Choice of tolerance grades for journals and bearing seats

The tolerance level of the hole and shaft matched with the tapered roller bearing is closely related to the tolerance level of the bearing. Generally, the shafts matched with /P6 and /PO bearings have a tolerance class of IT5~IT7, and a box hole of IT6~IT8.

3. The choice of nature

The choice of the bearing matching nature is to determine the basic deviation code of the journal and bearing seat matched with the bearing. 

The basis for selecting the matching nature of the bearing is: the type of load on the inner and outer rings of the bearing, the size of the load on the bearing, the working conditions of the bearing, the material and loading and unloading requirements of the hole and shaft that cooperate with the bearing, etc.