Rolling bearing radial clearance refers to a ring fixed, while the other rings in the amount of movement perpendicular to the direction of the NSK bearings axis, move from one extreme position to the other extreme position. Select the correct bearing clearance or not, has a great influence on the accuracy of mechanical operation, the bearing life, friction, temperature, vibration and noise, etc.. Such as travel to the heart bearing gap choice over an hour, then make to bear the load of rolling elements increased, the contact stress decreases relatively stable operation, NSK Bearings, however, the frictional resistance will increase the temperature rise will also increase. The contrary, the contact stress increases, vibration, while reducing the frictional resistance, low temperature rise. Thus, according to the conditions of use of NSK Bearings, choose the most appropriate value of the clearance of very important significance. Election a matter of fact bearing clearance, you must take full account of several factors:
1, the bearing and shaft and shell holes with elastic will lead to changes in the value of bearing clearance. General bearing mounting clearance values will cause narrowing;
NSK Bearings in the process of agency operation, due to a different axis and the thermal conditions of the shell, so that the temperature difference between inner and outer rings, which will lead to the narrowing of the value of the clearance;
3 axis and the shell material will lead to different coefficient of expansion, reduce or increase the value of the clearance.
Usually choose the most suitable value of the clearance is the bearing clearance standards set forth in the basic group clearance value of radial bearings. The basic group clearance values apply to the general working conditions, should be preferred. Clearance for radial bearings to work under special conditions can not be a basic group, the choice of the value of the auxiliary group clearance. Such as deep groove ball bearings 3, 4, 5 clearance values, tighter interference fit, or NSK bearing inner ring and the outer ring temperature difference larger than normal with the mechanical components used in the bearing and the shaft and shell holes in. In the larger inclination of the axis center and the center line of the shell hole, and in order to increase its ability to withstand the axial load to improve the bearing limit speed, and reduce the NSK bearing frictional resistance under working conditions, we can use the 3,4,5 group clearance value. For the requirements of the rotation precision or limit axial swimming, axis, generally use the Group 2 clearance values (small clearance value) of the bearing, if necessary, give a degree of pre-load "preload" in order to increase shaft rigidity.
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