The radial clearance of a double-row deep groove ball bearing refers to the movement amount of one ring that is fixed while the other ring moves from one extreme position to the other in a direction perpendicular to the axis of the double-row deep groove ball bearing. . Whether the choice of bearing clearance is correct or not has a great influence on the mechanical operation accuracy, bearing life, friction resistance, temperature rise, vibration and noise. If the clearance of the radial bearing is too small, the number of rolling elements bearing the load will increase, the contact stress will decrease, and the operation will be more stable. However, the friction resistance will increase and the temperature rise will also increase. On the contrary, the contact stress increases, the vibration is large, while the frictional resistance decreases and the temperature rise is low. Therefore, it is of great significance to select the most suitable clearance value according to the service conditions of the bearing. When selecting the actual bearing clearance, the following main factors must be fully considered:
1. The tightness of the fit between the double row deep groove ball bearing and the shaft and housing hole will lead to changes in the bearing clearance value. After the general bearing is installed, the clearance value will be reduced;
2. During the operation of the double-row deep groove ball bearing, due to the difference in heat dissipation conditions between the shaft and the housing, there is a temperature difference between the inner ring and the outer ring, which will lead to a reduction in the clearance value;
3. Due to the difference in expansion coefficient between the shaft and the shell material, the clearance value will be reduced or increased.
