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How to adjust the bearing clearance
Author:admin Date:2022-12-09
Bearing clearance is also called bearing clearance. The so-called bearing clearance refers to the amount of movement when the bearing is not installed on the shaft or bearing box, fixes one side of its inner ring or outer ring, and then moves the side whose bearing clearance is not fixed radially or axially. According to the moving direction, the PTFE soft belt bearing can be divided into radial clearance and axial clearance. The size of clearance (called operation clearance) during operation of self-lubricating thrust gasket has an impact on the rolling fatigue life, temperature rise, noise, vibration and other performances of bearing.
The bearing clearance standard is not stipulated by the state, but depends on the use: it is still a messy problem, which is briefly described as follows:
A. Selection criteria of clearance:
1. The large clearance group should be selected when tight cooperation, large temperature difference between inner and outer rings, oil-free self-lubricating composite bearings are required to reduce the conflicting torque, and deep groove ball bearings accept large axial loads or need to improve the centering performance.
2. When the rotation accuracy is required to be high or the axial displacement needs to be strictly limited, the small clearance group should be selected.
B. Elements related to clearance:
1. Cooperation between the bearing cone and the shaft.
2. Cooperation between bearing cup and housing bore.
3. The effect of temperature.
Note: The reduction of radial clearance is related to the size of interference, the size of matching shaft diameter, and the wall thickness of shell hole.
bearing clearance
1. Sensory method
Check the axial clearance of the rolling bearing with your finger. This method is applied to the situation where the shaft end is exposed. When the shaft end is closed or cannot be viewed with fingers for other reasons, check whether the shaft can roll flexibly.
2. Measurement method
(1) Use a feeler gauge to check the radial clearance in the same way as using a plug, but the axial clearance should be
c= λ/ （2sin β）
Where, c - axial clearance, mm;
λ—— Thickness of feeler gauge, mm;
β—— Bearing cone angle, (°).
(2) Check with a dial indicator. When the shaft is shifted to the two pole positions with a crowbar, the difference between the readings of the dial indicator is the axial clearance of the bearing. However, the force applied to the crowbar cannot be too large, otherwise the shell will undergo elastic deformation, even if the deformation is small, it will affect the accuracy of the measured axial clearance.
The bearing clearance standard is not stipulated by the state, but depends on the use: it is still a messy problem, which is briefly described as follows:
A. Selection criteria of clearance:
1. The large clearance group should be selected when tight cooperation, large temperature difference between inner and outer rings, oil-free self-lubricating composite bearings are required to reduce the conflicting torque, and deep groove ball bearings accept large axial loads or need to improve the centering performance.
2. When the rotation accuracy is required to be high or the axial displacement needs to be strictly limited, the small clearance group should be selected.
B. Elements related to clearance:
1. Cooperation between the bearing cone and the shaft.
2. Cooperation between bearing cup and housing bore.
3. The effect of temperature.
Note: The reduction of radial clearance is related to the size of interference, the size of matching shaft diameter, and the wall thickness of shell hole.
bearing clearance
1. Sensory method
Check the axial clearance of the rolling bearing with your finger. This method is applied to the situation where the shaft end is exposed. When the shaft end is closed or cannot be viewed with fingers for other reasons, check whether the shaft can roll flexibly.
2. Measurement method
(1) Use a feeler gauge to check the radial clearance in the same way as using a plug, but the axial clearance should be
c= λ/ （2sin β）
Where, c - axial clearance, mm;
λ—— Thickness of feeler gauge, mm;
β—— Bearing cone angle, (°).
(2) Check with a dial indicator. When the shaft is shifted to the two pole positions with a crowbar, the difference between the readings of the dial indicator is the axial clearance of the bearing. However, the force applied to the crowbar cannot be too large, otherwise the shell will undergo elastic deformation, even if the deformation is small, it will affect the accuracy of the measured axial clearance.
