Selection of bearing installation clearance

Selection of clearance

The clearance after deducting the expansion or contraction of the ferrule caused by interference fit when the bearing is installed on the shaft or in the housing from the theoretical clearance is called "installation clearance". 

The clearance after adding or subtracting the dimension change caused by the temperature difference inside the bearing to the installation clearance is called "effective clearance". The bearing is installed with a clearance when it is placed under a certain load, That is, the effective clearance plus the elastic deformation caused by the bearing load is called "working clearance\ ". when the working clearance is slightly negative, the fatigue life of the bearing is long, but the fatigue life decreases significantly with the increase of the negative clearance. Therefore, when selecting the bearing clearance, it is generally appropriate to make the working clearance zero or slightly positive. In addition, when it is necessary to improve the rigidity of the bearing or reduce the noise, the working clearance should be further taken as a negative value, while when the bearing temperature rises sharply, the working clearance should be further taken as a positive value, etc., which must be done according to the service conditions Specific analysis.