1, the working conditions of the bearing, such as load, temperature, speed, etc.;
2. Requirements for bearing performance (rotational accuracy, friction torque, vibration, noise);
3. When the bearing and the shaft and the housing hole are in an interference fit, the bearing clearance is reduced;
4. When the bearing is working, the temperature difference of the inner jacket ring causes the bearing clearance to decrease;
5. The bearing clearance is reduced or increased due to the different expansion coefficients of the shaft and the outer casing material.
6, according to the experience of use, the most suitable working clearance of the ball bearing is close to zero; roller bearings should maintain a small amount of working clearance. In components requiring good bearing rigidity, the bearings allow a certain amount of preload. It is specifically pointed out here that the so-called working clearance refers to the clearance of the bearing under actual operating conditions. There is also a kind of play called the original play, which refers to the play before the bearing is not installed. The original clearance is larger than the installation clearance. Our choice of clearance is mainly to choose the right working clearance. Valve inlet pump
7. The clearance values specified by national standards 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). When selecting, under normal working conditions, the basic group should be preferred, so that the bearing can get the proper working clearance. When the basic group does not meet the usage requirements, the auxiliary group clearance should be used. The large clearance auxiliary group is suitable for interference fit between the bearing and the shaft and the housing hole. The temperature difference between the inner and outer rings of the bearing is large. The deep groove ball bearing needs to bear a large axial load or needs to improve the centering performance. Reduce the bearing friction torque and other occasions; the small clearance auxiliary group is suitable for the requirements of higher rotation accuracy, strict control of the axial displacement of the housing hole, and the need to reduce vibration and noise.
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