What is the difference between rolling bearings and sliding bearings?

Summary: What is the difference between rolling bearings and sliding bearings? Bearings are indispensable parts in most mechanic...
What is the difference between rolling bearings and sliding bearings?
Bearings are indispensable parts in most mechanical equipment, and have the function of supporting point rotation. According to the different characteristics of friction in the bearing, it can be divided into two types of bearings (rolling bearings) and (sliding bearings). The two bearing structure types have their own characteristics, and the characteristics also have their own advantages and disadvantages, which can be considered in connection with the actual application.
The characteristics of rolling bearings and sliding bearings are relatively
(1) Comparison between structure and movement mode
The most significant difference between rolling bearings and sliding bearings is whether there are rolling elements.
The rotation of the rolling bearing relies on the rolling elements to support the point drive shaft, so the touched position is a point. The more rolling elements, the larger the touched point.
The sliding bearing is designed without rolling elements and relies on a smooth surface to drive the shaft.
The different structures of the two types of bearings determine the operating methods of the two types of bearings are also completely different.
Rolling bearing
(2) Comparison of bearing capacity
Generally speaking, the bearing capacity of the sliding bearing is higher than that of the rolling bearing, and the rolling bearing is not capable of working under the impact load, but the thoroughly liquid lubricated bearing has a buffering effect due to the lubricating slick oil, and can bear relatively large impacts. Sexual load. When the bearing speed is high, the centripetal force of the rolling elements in the rolling bearing increases, and the bearing capacity needs to be reduced.
(3) Comparison of frictional resistance and starting frictional resistance
Under working conditions, the friction resistance of rolling bearings is much lower than that of sliding bearings, and the marked value is relatively stable. The lubrication of sliding bearings is very susceptible to damage from external elements, resulting in a large range of friction system changes.

Sliding bearing
(4) Comparison of output power damage
Because the frictional resistance of the rolling bearing is small, the damage to the output power during operation is not large. Compared with the bearing without thorough liquid lubrication, the output power damage will increase sharply if the lubrication and installation are not good.
(5) Comparison on other levels
The amount of grease and lubricant used in the maintenance of rolling bearings is relatively small, and the amount is relatively large in the case of high-speed rotation. The cleanliness of the lubricating oil is regulated, so the sealing is stipulated, but the bearing is easy to replace and replace, and there is no need to repair the motor shaft. For sliding bearings, in addition to incompletely liquid lubricated bearings, lubricants are also generally used in liquid or vapor. The amount of lubricant is also relatively large, and the oil cleanliness regulations are also high. Bearing piston pins must be replaced frequently. At that time, the motor shaft was also repaired.