Bearing clearance

Source: China Bearing Network Time: 2014-07-06

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The so-called bearing clearance; that is, when the bearing is not installed in the shaft or the bearing box; the one of the inner ring or the outer ring is fixed; then the unmoved one is moved in the radial or axial direction. Direction; can be divided into radial clearance and axial clearance.
The size of the play during operation (called work clearance) has an impact on the bearing's tumbling fatigue life, temperature rise, noise, oscillation and other functions.
When measuring the clearance of the bearing; in order to obtain a stable measurement value; usually impose a regular measurement load on the bearing.
Therefore, the measured value is larger than the real clearance (called the theoretical clearance); that is, the amount of elastic deformation occurring by the measured load is increased.
But with regard to roller bearings; because the amount of elastic deformation is more serious than the round.
The internal clearance of the front bearing of the device is usually indicated by the theoretical clearance.
The selection of the clearance from the theoretical clearance minus the expansion of the ferrule caused by the interference cooperation when the bearing device is on the shaft or the casing is referred to as "device clearance".
The clearance after adding or subtracting the scale variation caused by the internal temperature difference of the bearing on the device clearance is called "useful clearance".
The bearing device has a clearance when the machine is subjected to a certain load; that is, the available clearance plus the amount of elastic deformation of the bearing load is referred to as "working clearance".
When the working clearance is slightly negative; the fatigue life of the 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 working clearance is zero or Slightly positive.
The relationship between the working clearance and the fatigue life is different; when the rigidity of the bearing needs to be improved or the noise needs to be reduced; the working clearance should further take a negative value; and when the bearing temperature rises sharply; the working clearance should further take a positive value, etc. Etc.; must also be based on the conditions of use for specific analysis.

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