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Clearance measurement of bearing, as measured by the stable value, generally applied to the measurement of bearing load regulation.
Therefore, the obtained measurements than real clearance (called the theory of clearance), that increases the measuring load produced by the elastic deformation.
But for roller bearing, the elastic deformation is small, can be neglected.
Before installing the bearing internal clearance is generally used theoretical clearance said.
Clearance choice
From the theory of minus the bearing clearance is mounted on the shaft or housing for the ring expansion or contraction of the play called "installation clearance fit".
In the installation clearance on addition and subtraction caused by bearing internal temperature difference of dimensional variation after clearance called "effective clearance".
Bearing is provided with a mechanical bearing clearance certain load placement, effective clearance and bearing load produced by the elastic deformation of the so called "after work clearance".
When the working clearance is slightly negative, bearing fatigue life is the longest but with increasing negative clearance with significantly reduced fatigue life. Therefore, selection of bearing clearance, the clearance for general zero or slightly positive is appropriate.
In addition, the need to improve the rigidity of the bearing or the need to reduce noise, clearance work to further negative, while in the bearing temperature rise is violent, clearance work to further take positive values and so on, must also make a concrete analysis according to the terms of use.