If the working clearance of the bearing is too small, the friction torque of the bearing will be increased, which will generate a lot of heat, which will easily lead to heat damage to the bearing. This is because when the working clearance of the bearing is too small, the rolling elements of the bearing and the inner and outer rings of the bearing will be poorly lubricated, and a lot of heat will be generated due to dry friction, resulting in wear, cementation, and cracking of the inner and outer rings of the bearing until the bearing is damaged.