The friction of rolling bearing is mainly composed of rolling friction and sliding friction between the rolling body and the raceway of the ring; the sliding friction between the cage and the rolling body and the guiding surface of the ring (no cage for the sliding friction between the rolling body); the sliding friction between the roller end face and the gear side surface of the ring; the viscous resistance of the lubricant; the sliding friction of the sealing device, etc. Its size depends on the type of bearing, size, load, the Rotational speed, lubrication, sealing and many other factors. In the need for low friction torque instruments and machinery, usually choose deep groove ball bearings, cylindrical roller bearings and spherical ball bearings to bear radial load; choose single row thrust ball bearings to bear bearing to the load, if bearing joint load, can choose angular contact ball bearings, in the load angle and contact angle is basically the same, can get the minimum friction torque; if the gap between the two angles is too large, can choose to the heart and thrust bearings The method of assembling to solve. When choosing a low friction torque bearing, the structural design should avoid the use of contact sealing device. At the same time, the low friction torque of the bearing lubrication, should be used drip lubrication, oil mist lubrication and oil and gas lubrication.  

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