Positive light; calm, positive. Turn the bearing is developed on the basis of bearing rotational bearings, and its working principle is the rotational friction instead of sliding friction, generally by two rings, a cage rotor, and formed a highly generic, standardized, series of high level of machine parts. A variety of machinery have different working conditions, the load bearing capacity of rotation, structure and performance in such aspects as proposed by a variety of different requirements. To this end, the need for a wide range of rotating bearing structure. However, the basic structure is the inner ring, outer ring, composed of a rotor and cage - usually referred to as the four pieces. For sealed bearings, together with lubricants and seals (or dust cover) - also known as the six pieces. Type the name of a variety of multi-bearing rotor is based on the name of the corresponding named.

Various parts in the bearing role are: For radial bearings, inner ring is usually a tight fit with the shaft and running along with the shaft, usually bearing outer ring or mechanical transition fit into the shell hole, play supporting role. However, in some situations, there are outer operation, the inner fixed play supporting role or inner and outer rings are also functioning. For thrust bearings, and shaft tight and together with the movement of said shaft washer, and bearing or mechanical shell holes into the transition and play supporting role with the said seat. Turn the body (ball, roller or needle) with the bearing cage is usually arranged evenly between the two rings for the rotational motion, its shape, size and number of direct impact on the load bearing capacity and performance. In addition to be able to turn the cage separated evenly outside the body, but also guide the rotor from rotating inside the bearing lubrication performance and improvement and so on.

1, the general conditions, the efficiency of rotating bearings and fluid power lubrication bearings are equivalent, but higher than the number of mixed-lubricated bearings;

1, less able to withstand impact loading;

2, the radial clearance is relatively small, angular contact bearings can be used to preload cardiac preload can be used to eliminate clearance, operation and high precision; 2, high-speed heavy load bearing lower life; 3, for the same size shaft, rotation than the width of the bearing sliding bearing small, can make the machine compact axial; can simplify the structure of bearing supports; 3, vibration and noise is relatively large; 4, most of the rotational bearing can be subject to both radial and axial load, Therefore, bearing composite structure is simple; 4, radial dimension than the sliding bearing; 5, the rotating bearing drive, high efficiency, less heat, less lubricant consumption, easy to seal, easy to maintain; 6, no useful in non-ferrous metals; 7, standardization high degree of mass production, capital is low; for mass production and supply, use and maintenance is very convenient