Rolling bearings have advantages over plain bearings

Compared with plain bearings, rolling bearings have the following advantages:

1. The friction coefficient of rolling bearing is smaller than that of sliding bearing, and the transmission efficiency is high. The friction coefficient of general sliding bearings is 0.08-0.12, while the friction coefficient of rolling bearings is only 0.001-0.005;

2. Rolling bearings have been standardized, serialized and generalized, suitable for mass production and supply, and very convenient to use and maintain;

3． Rolling bearings are made of bearing steel and are heat-treated. Therefore, rolling bearings not only have higher mechanical properties and longer service life, but also can save the expensive non-ferrous metals used in the manufacture of sliding bearings;

4． 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 pre-loading. This is very important for precision machinery;

5. Some rolling bearings can support both radial and axial loads, so the structure of the bearing support can be simplified;

6. Because the rolling bearing has high transmission efficiency and low heat generation, it can reduce the consumption of lubricating oil and save lubrication and maintenance;

7. Rolling bearings can be easily applied to uranium in any orientation in space.

However, everything is divided into two, and rolling bearings also have certain disadvantages, mainly:

1. Rolling bearings can withstand loads much smaller than sliding bearings of the same volume. Therefore, the radial size of rolling bearings is large. Therefore, in the case of bearing large loads and where the radial size is small and the structure is required to be compact, sliding bearings are often used;

2. Rolling bearings have large vibration and noise, especially in the later stage of use. Therefore, when high precision is required and no vibration is allowed, rolling bearings are difficult to perform. Generally, sliding bearings are more effective.

3． Rolling bearings are particularly sensitive to foreign objects such as metal filings. Once foreign objects enter the bearing, intermittent vibration and noise will occur, and early damage will also occur. In addition, rolling bearings are also prone to early damage due to impurities such as metal clips. Even if early damage does not occur, the life of rolling bearings has a certain limit. In short, the life of rolling bearings is shorter than that of plain bearings.

However, compared with sliding bearings, rolling bearings have their own advantages and disadvantages, and each has a certain application. Therefore, the two cannot completely replace each other, and each develops in a certain direction to expand its own field. However, due to the outstanding advantages of rolling bearings, there is a tendency for latecomers to take the lead. At present, rolling bearings have developed into the main supporting types of machinery, and their applications are becoming more and more widespread.