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Challenges to consider when selecting a bearing clearance: /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Clearance is an important factor in the normal operation of the rolling bearing; it is divided into axial clearance and radial clearance. Select the appropriate clearance; the load can be reasonably distributed between the bearing rolling elements, and the shaft (or casing) can be restrained. The axial and radial displacement; ensure the rotation accuracy of the shaft, can make the bearing work normally at regular temperature, reduce the oscillation and noise; help to improve the life of the bearing. Therefore, when selecting the bearing; it is necessary to select the appropriate Bearing clearance.
When selecting a bearing clearance; consider the following aspects:
1, the working conditions of the bearing; such as load, temperature, speed, etc.
2. The demand for bearing function (rotational accuracy, collision torque, oscillation, noise),
3. When the bearing and the shaft and the casing hole are in interference cooperation, the bearing clearance is reduced.
4. When the bearing is in operation; the temperature difference of the inner jacket ring causes the bearing clearance to decrease.
5. The expansion coefficient of the shaft and casing data is different; the bearing clearance is reduced or increased.
6, according to the application experience; the most suitable working clearance of the ball bearing is close to zero, the roller bearing should maintain a small amount of work clearance. In the parts with outstanding support rigidity; the bearing promises a certain value of pre-tightening force. It is uniquely pointed out here; the so-called working clearance refers to the clearance of the bearing under practical working conditions. There is also a kind of clearance called the original clearance; it refers to the clearance before the bearing is installed. The original clearance is larger than the device clearance. The choice of clearance; mainly to select the appropriate job clearance.
7. The clearance values ​​of the national standard rules are divided into three groups: basic group (0 group), small clearance auxiliary group (1, 2 group) and large clearance auxiliary group (3, 4, 5 groups). Under normal working conditions; the basic group should be preferred; the bearing can get the proper working clearance. When the basic group can not be used satisfactorily, the auxiliary group clearance should be used. The large clearance auxiliary group is suitable for bearings and The shaft and the shell hole adopt interference cooperation; the temperature difference between the inner and outer rings of the bearing is large; the deep groove ball bearing needs to accept a large axial load or needs to improve the centering function; the heart and the demand progress limit speed and the falling bearing conflict torque, etc. The gap auxiliary group is suitable for the rotation precision with high demand, the axial displacement of the housing hole to be strictly controlled, and the occasion where the oscillation and noise need to be reduced.
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What should be considered when choosing a bearing clearance?
Source: Bearing network time: 2017-11-13