Bearing structure and performance

At present, double-row tapered roller bearing is a typical TDO structure, that is, it is composed of two inner ring components, a middle ring and an outer ring. The bearing can withstand axial loads in two directions. The rolling body is in linear contact with the channel of the inner and outer ring, and it has certain radial and axial load capabilities, but not as good as the aligning performance. Will cause bearing uneven force, performance decline.

It is mainly cage wear, which leads to locking. The characteristics are as follows:

1. Single column of positioning bearings is damaged, and most of them are concentrated in the outer column.

3.the inner row of rolling body normal wear, bright surface, no high temperature and rolling step problems.

Cause analysis

From the above damage characteristics analysis, it is concluded that: When the rolling mill is running at high speed, there is a large abnormal axial load. The axial load acts on the outer row of rolling body, leading to serious sliding friction between the end face of rolling body and the guard edge, causing high temperature and oil shortage. At the same time, the ball base surface of the end face of rolling body and the rolling body wear and damage, and the rotating track of rolling body skew, which leads to the unstable operation of the cage and the periodic shear force. Causes the above 3 phenomena, leading to cage damage, cage damage directly leads to bearing lock burning.

Recommended adjustment measures

1. Ensure that the eccentricity of the center line of the main bearing box hole and the positioning bearing hole meets the requirements of the drawings to avoid the deviation of the center line of the main bearing and the positioning bearing and the wear of the cage caused by rotation;

2, increase the lubrication of positioning bearing;

3. Adjust the compression degree of the outer ring, first measure the distance between the gland end face and the positioning bearing end face before installation, determine the thickness of the gasket, and ensure that there is 0.05-0.10mm gap between the gland locking and the positioning bearing end face after installation;

4. Customized thickened cage to improve the strength and deformation resistance of cage.