double row deep groove ball bearing radial clearance refers to a ring fixed, but another ring in the direction perpendicular to the axis of the double row deep groove ball bearing, the position of an extreme to another extreme position of the mobile. the choice of bearing clearance correctly or not, for precision and mechanical operation of the bearing life, friction, temperature rise, vibration and noise and so on all have great influence. as the choice of centripetal bearing clearance before hours, can make the load of rolling element number increases, the contact stress is reduced, operation is stable, but will increase friction resistance, temperature rise will increase. conversely, increases the contact stress, vibration, and the frictional resistance is reduced, low temperature rise. therefore, according to the bearing conditions of use, select the most appropriate clearance value, has the very vital significance. choose in fact bearing clearance, must fully consider the following several major factors:
1, double row deep groove ball bearing and shaft and the shell hole with elastic will lead to the change of the bearing clearance value. general bearings after installation will make the clearance value reduces;
2, double row deep groove ball bearing in the process of institutions, because of the different cooling condition of shaft and the shell, to produce temperature difference between inner ring and outer ring, and thus leads to narrowing of the clearance value;
3, because the axis and shell material because of the different expansion coefficient, leads to narrowing or increase the clearance value.
