Compared with sliding bearing, rolling bearing has larger radial dimension, poor damping capacity, low service life and larger noise at high speed. This is its shortcoming.
The basic structure of sliding bearing is divided into bearing bush and journal.
Sliding friction is essentially different from rolling friction (one is point contact, the other is surface contact), which has its own advantages and disadvantages.
advantage:
1. High bearing capacity; (reason for large contact area)
2. Simple structure, convenient manufacture, processing and disassembly;
3. Good shock resistance and good vibration absorption performance, stable operation and high rotation accuracy.
1. The maintenance is complex and requires high lubrication conditions;
2. The boundary lubrication bearing has large friction and wear. (this is also the disadvantage of large contact area)
The use of sliding bearing is: high speed, high precision, heavy load, there is the presence of low-speed impact in the machine. In addition, rolling bearings are widely used in most occasions.