What is the reason of this early damage to tapered roller bearings? The following editor will tell you the main reasons for the early failure of this tapered roller bearing:

(1) The hardness of the bearing ring does not match the hardness of the roller. The hardness of the inner ring is slightly higher than that of the roller, which enhances the ability of the inner ring raceway to leave the edge and press into the roller.

(2) The contact between the roller and the raceway of the tapered roller bearing under the condition of zero load is a line contact. Because the inner ring raceway is ground and left, the contact between the roller and the roller changes from the line contact to the line contact. Approximate point contact. Therefore, when the bearing is working, its rollers are subjected to a great shear stress, resulting in stress concentration. When the shear stress exceeds the fatigue limit of the material, fatigue cracks occur. With the action of cyclic loading, fatigue cracks propagate along the grain boundaries and form spalling, which in turn leads to early fatigue failure of the bearing.

(3) The grinding edge of the tapered roller bearing inner ring raceway is caused by the improper adjustment of the clamping position of the raceway and the grinding wheel during the final grinding of the inner ring raceway, or the narrow selection of the final grinding wheel width.

From the above analysis, it can be seen that the tapered roller bearing here fails because of the edge left on the inner ring raceway during the grinding process of the bearing inner ring. Therefore, during the grinding process of the inner ring raceway, the width of the grinding wheel must be selected properly and the clamping position of the inner ring raceway and the grinding wheel must be accurate to avoid the generation of the inner ring raceway edge, thereby avoiding the early failure of the bearing.