Installation Method of Bearing Base

Installation Method of Bearing Base

As a close partner of bearing, bearing seat plays an important role in the whole shaft system. It is generally located at both ends of the shaft. Its main function is to support and fix bearings, so that the shaft and its connecting parts have a certain position relationship. In addition, bearing seats are usually equipped with sealing devices, thus reducing the pollution of bearings.

When it comes to the installation method of bearing seat, there are the following concentrations:

1. Pressure fit method

It is possible to press the bearing on the shaft with a press first, then install the shaft and the bearing together into the bearing seat hole. When pressing, attention should be paid to the end face of the bearing inner ring, padded with an assembly sleeve made of soft metal material, and the inner diameter of the assembly sleeve is larger than that of the journal, while the outer diameter should be smaller than that of the inner ring of the bearing. Bearing outer ring should be closely matched with bearing seat hole. If the inner ring and shaft are loosely matched, the bearing can be pressed into the hole of bearing seat first. At this time, it should be noted that the outer diameter of the assembly casing should be smaller than the diameter of the seat hole. If the bearing ring is closely matched with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time.

2. Heating Coordination Method

This is a commonly used and labor-saving installation method, which uses thermal expansion to change tight fit into loose fit. Firstly, the rings of bearings or separable bearings should be put into the oil tank for uniform heating. The temperature range is generally 80-100 C. After heating, the rings should be removed from the mailbox and installed on the axle as soon as possible. In order to avoid the discrepancy between the end face of the inner ring and the shoulder of the bearing after cooling, axial tightening can be carried out.

When the outer ring of the bearing is closely matched with the bearing seat, the scratch surface can be avoided by heating the bearing seat. When heating bearings with mailbox, the bearings can not be placed directly at the bottom of the box. A mesh grid should be placed at a certain distance from the bottom of the box, or the bearings should be hanged directly with a hook. In addition, a thermometer must be installed in the mailbox to control the oil temperature not exceeding 100 C in order to prevent tempering effect and reduce the hardness of the ring.

3. Installation of tapered hole bearings

If the conical surface is fitted with a fixing sleeve and a retracting sleeve, the tapered bore bearing can be installed on the tapered journal. The radial clearance reduction of the bearing can be used to balance the tightness. Before installation, the radial clearance of the bearing should be measured, and the clearance should be measured regularly during installation until the required clearance reduction is achieved. In general, locking nuts are used for installation, and heating installation method can also be used.

4. Installation of thrust bearings

The installation of thrust bearing is relatively simple. Firstly, the middle axle of the two-way thrust bearing is fixed on the bearing to prevent it from rotating on the axle. The fit between bearing inner ring and shaft belongs to interference fit, while the fit between bearing outer ring and bearing chamber belongs to clearance fit.