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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Several aspects that should be considered when selecting a bearing clearance Several aspects to consider when choosing a bearing clearance
When selecting a bearing clearance; consider the following aspects: /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
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 selection of the clearance; mainly to select the appropriate working clearance. Valve inlet pump 7, the national standard rules of the clearance value is divided into three groups: there are basic group (0 group), small clearance auxiliary group (1, 2 groups) ) and the large clearance auxiliary group (groups 3, 4, 5). When selecting; under normal working conditions; the basic group should be preferred; the bearing can get the appropriate working clearance. When the basic group is not satisfied with the demand ; should use the auxiliary group clearance. The large clearance auxiliary group is suitable for the bearing and the shaft and the shell hole to use the interference cooperation; the bearing inner and outer ring temperature difference is large; the deep groove ball bearing needs to accept the large axial load or need to improve the alignment Function; heart and demand progress limit speed and down axis Conflict moment other occasions, a small clearance assisted group suitable for higher rotational accuracy requirements, should be strictly controlled axial displacement of the housing bore; and where the need to reduce vibration and noise.
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.
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Several aspects to consider when choosing a bearing clearance
Source: China Bearing Network Time: 2014-03-06