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Selection tips for roller bearing clearance

May 27, 2019

Do you know which method to pick the roller bearing clearance?


1. Roller bearing clearance: means that the idler bearing is not installed in the shaft or bearing housing; the one of the inner or outer ring is fixed; then the unfixed one is moved radially or axially. The amount of movement. According to the direction of movement; it can be divided into the radial clearance and the play of the axial clearance operation (called the working clearance), which has the functions of rolling fatigue life, temperature rise, noise, oscillation, etc. influences.


2. When measuring the clearance of the bearing; in order to obtain a stable measurement value; usually the regular measurement load is applied to the bearing. Therefore, the measured value obtained is larger than the actual clearance (referred to as the theoretical clearance); that is, the measurement load is increased. The amount of elastic deformation that occurs is related to the roller bearing; because the amount of elastic deformation is higher than the internal clearance of the front roller bearing of the device, it is usually indicated by the theoretical clearance.


3, the selection of the idler bearing clearance: from the theoretical clearance minus the bearing device on the shaft or the outer casing when the expansion of the ferrule caused by the interference cooperation, the expansion of the lap is called "device clearance" The clearance of the device clearance plus or minus the scale variation caused by the internal temperature difference of the bearing is called “useful clearance”. The bearing device has the clearance when the mechanical load is accepted by a certain load; that is, the useful clearance plus the bearing load After the amount of elastic deformation occurs, it is called “working clearance”. When the working clearance is slightly negative, the fatigue life of the roller bearing is the longest, but the fatigue life decreases with the increase of the negative clearance. Therefore; when selecting the clearance of the bearing; usually the job clearance is zero or slightly positive.