Characteristics of rolling bearings compared to plain bearings

Bearings are the product of social development. Bearings can be divided into many types. The following is a brief introduction of the characteristics of rolling bearings compared with sliding bearings.

Rolling bearings are made of bearing steel and heat treated, so rolling bearings not only have high mechanical properties and long service life, but also save the expensive non-ferrous metals used in the manufacture of sliding bearings. Since the rolling bearing has high transmission efficiency and low heat generation, the consumption of lubricating oil can be reduced, and lubrication maintenance is relatively trouble-free. Some rolling bearings can also withstand radial and axial loads, simplifying the structure of the bearing support.

Rolling bearings have been standardized, serialized and generalized, suitable for mass production and supply, easy to use and maintain, and rolling bearings can be easily applied to uranium in any orientation in space. The internal clearance of the rolling bearing is small, and the machining accuracy of each part is high, so the running accuracy is high. At the same time, the rigidity of the bearing can be increased by a preloading method. This is very important for precision machinery.

Rolling bearings also have certain disadvantages: the rolling bearing vibration and noise are relatively large, and it is more remarkable in the later stage of use. In the case where the precision is high and vibration is not allowed, the rolling bearing is difficult to perform, and the sliding bearing is generally better. The ability of a rolling bearing to withstand a load is much smaller than that of a plain bearing of the same volume, and the radial dimension of the rolling bearing is large. Therefore, in the case of a large load and a case where a small radial size and a compact structure are required, a sliding bearing is often used.

Compared with sliding bearings, rolling bearings have their own advantages and disadvantages, but the two can not completely replace each other, and each develops in a certain direction to expand their field. At present, rolling bearings have developed into the main support type of machinery, and the application is more and more extensive.