Import bearings rolling the radial clearance refers to a fixed collar, and the other a contractor in vertical axis in bearing, by an extreme position to the other extreme position of moving. Bearing clearance choice is correct or not, the mechanical operation precision, bearing life, friction resistance, normal temperature, vibration and noise etc all has very big effect. As to the heart of NTN bearing clearance choice over hours, can make up the load of the increased number of roller, reduce the contact stress, running a smooth, however, will increase friction resistance, temperature rise would increase. Conversely, the contact stress increases, vibration, and reduce the friction resistance, low temperature. Accordingly, according to bearing conditions of use, to select the most appropriate clearance value, has the extremely vital significance. Choose in fact FAG bearing clearance, must consider the following several kinds of main factors:

(1) bearings and shaft and the shell holes with aid can lead to bearing clearance of the values of the change. General bearing installation would make a clearance value reduces;

(2) bearing in institutions in the process of operation, because of the heat and shell of shaft of the different conditions, make the inner ring and outer ring temperature difference between produce, and this can lead to clearance of value reduces;

(3) the shaft and the shell material for different expansion coefficient, will lead to the clearance of the values of the narrow or increased.

Usually NACHI bearing to the heart to select the most suitable work clearance value is bearing clearance as stipulated in the standard of the basic group clearance value. Basic group clearance value used in general working conditions, priority should be to choose. For in the special conditions of work to heart bearings cannot use the basic group clearance, can choose auxiliary group clearance value. Such as deep groove ball bearing 3, 4, and 5 group clearance value, applicable to bearing and shaft and the shell holes are more tightly than normal with the interference or bearing inner circle with their work of the large temperature difference of mechanical components. In the shaft center and housing holes large center line gradient, and in order to increase their carry axial load capacity, improve SKF bearing limit rotational speed, and reduce the friction resistance, bearing conditions or a 3, 4, and 5 groups of clearance value. Asking for rotation precision or limit axial swimming shaft, generally USES the group 2 clearance value (small clearance value) bearing, when necessary, to give certain the add load "preloaded" to improve shaft rigidity.



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