What is the difference between engineering plastic sliding bearings and plastic rolling bearings?

What is the difference between engineering plastic sliding bearings and plastic rolling bearings?

From the structure of plastic sliding bearings and plastic rolling bearings: Plastic sliding bearings are a single integral structure, while plastic rolling bearings are composed of inner and outer rings, cages, balls and sealing covers.

In terms of materials: Plastic sliding bearings are generally made of high-performance engineering plastics which is optimized for friction; The requirements for material production are high since friction optimization takes advantages of polymer material compound modification technology; For manufacturers, not only talents polymer materials engineers are needed, but also the powerful performance testing equipment are required as supports. On the other hand, the plastic rolling bearings are generally made of engineering plastic rods, which are made by turning the inner and outer rings, coupled with plastic cages and balls; In addition to the relatively high requirements for processing accuracy of plastic rolling bearings, the requirements for friction and wear properties of engineering plastics themselves are lower than those of plastic sliding bearings.

About the working principles: The outer surface of plastic sliding bearings and the housing bore are assembled with each other by interference fit during the installation and there is no relative movement; It is a sliding Friction pair between the inner surface of the plastic sliding bearing and the grinding shaft. While for the plastic rolling bearing, it is press-fitted into the housing bore. The outer ring and the housing bore are relatively fixed and there is no relative movement between the inner ring of the plastic rolling bearing and the shaft, and it is rolling friction between the balls and the inner and outer rings.

In a word, we can tell the differences between the plastic sliding bearing and the plastic rolling bearing in actual use from above easily: The plastic sliding bearing and the grinding shaft are surface-to-surface contact, and the plastic rolling bearing is point-to-line contact during work. This determines that the bearing capacity of plastic sliding bearings is much greater than that of plastic rolling bearings. The sliding friction occurs when the plastic sliding bearing works, and the rolling friction occurs when the plastic rolling bearing works, that makes the allowable rotation speed of the plastic rolling bearing is greater than that of the plastic sliding bearing. In addition, the temperature resistance and chemical corrosion resistance of plastic sliding bearings and plastic rolling bearings are basically the same if using the same base material.