Advantages and disadvantages of rolling bearings
In the design of mechanical parts, rolling bearings and plain bearings are often used. Compared with sliding bearings, rolling bearings have the following advantages and disadvantages.
(1) In the general working condition, the friction coefficient of the rolling bearing is small, does not change with the change of the friction coefficient, and is relatively stable; the starting and running torque are small, the power loss is small, and the efficiency is high.
(2) The radial clearance of the rolling bearing is small, and can be eliminated by the axial pre-tightening method, so the running precision is high.
(3) The axial width of the rolling bearing is small, and some bearings are subjected to the combined radial and axial loads at the same time, and the structure is compact and the combination is simple.
(4) Rolling bearings are standardized components with high standardization and can be produced in batches, so the cost is low.
(1) The contact area between the rolling bearing and the pipe of the rolling bearing is small, especially the ball bearing, and the impact resistance is poor.
(2) Due to the structural characteristics of the rolling bearing, the radial clearance is determined to be large, resulting in large vibration and noise.
(3) Rolling bearings have a reduced life at high speed and heavy load.
(4) The inner and outer rings of the rolling bearing adopt a monolithic structure, and part of the structure cannot be used, which makes it difficult to install the bearing in the middle of the long axis.