The so-called rolling bearing clearance, meaning Rolling is not installed on the shaft or the Rolling Box, a party to the inner or outer ring fixed, then the party is not a fixed amount of movement in the radial or axial movement. Under the direction of movement can be divided into the radial clearance and axial clearance.
Clearance operation (referred to as the size of the clearance work) rolling fatigue life of rolling bearings, temperature, noise, vibration and affect performance.
Rolling clearance measurements, in order to get a stable measurement value, usually imposed on the rolling bearing load of the specified measurement.
Therefore, the measured values ??than the true clearance (known as the theory of clearance), an increase of elastic deformation generated by the measuring load.
But for rolling bearings, the elastic deformation can be negligible.
The internal clearance before installation Rolling general theoretical clearance.
The choice of clearance
Clearance due to interference with the amount of expansion or contraction of the ring from the theoretical clearance minus the rolling bearing is installed on the shaft or housing known as the "installation clearance.
Size changes in the amount of addition and subtraction in the installation clearance due to the temperature difference of the rolling bearing internal clearance is called "clearance".
Rolling installed to withstand the load placed on the clearance machinery, effective clearance coupled with elastic deformation generated by the rolling bearing load, so called "work clearance.
Clearance work for the micro-negative, the longest fatigue life of rolling bearings but with the increase of the negative clearance fatigue life with a significant decline. Therefore, the rolling bearing clearance, the general working clearance is zero or slightly positive is appropriate.
In addition, the need to improve the rolling bearing rigid or need to reduce the noise, the clearance should further be negative, in the rolling bearing temperature rise of violent clearance work will have to further positive, but also for specific analysis must be based on conditions of use .
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