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What differences are there between engineering plastic sliding bearings and plastic rolling bearings?
Release Date:2015-06-24    Total Hits:1480bout

We can distinguish plastic sliding bearings and plastic rolling bearings on the basis of structure: Plastic sliding bearings have a simple overall structure, while plastic rolling bearings are composed of inner and outer rings, retainers, balls, and seals.

We can also distinguish them on the basis of their materials: Plastic sliding bearings are ordinarily made of high-performance engineering plastic optimized to reduce friction. Because polymer composite modification technology is needed for friction optimization, materials production requirements are quite high, and manufacturers require both polymer specialists and extensive performance testing equipment. In the case of plastic rolling bearings, inner and outer rings are produced from engineering plastic rod using lathes, and are then fitted with plastic retainers and balls. While plastic rolling bearings require a high level of processing precision, the wear performance requirements of their engineering plastic material are lower than in the case of plastic sliding bearings.

We can further distinguish them on the basis of their operating principles: Plastic sliding bearings are installed via an interference fit between the bearings' outer diameter and their mounting holes, while plastic sliding bearings are installed with a sliding friction couple between their inner diameter and the mating shafts. The outer rings and mounting holes of plastic rolling bearings are fixed relative to each other after installation, while the inner rings and shafts of plastic rolling bearings can move relative to each other. The balls and inner and outer rings of plastic rolling bearings are subject to rolling friction.

Finally, we can easily distinguish the usage plastic sliding bearings and plastic rolling bearings based on the foregoing differences: Plastic sliding bearings are in face-to-face surface with their mating shafts, while plastic rolling bearings are in point and line contact with their shafts. As a result, plastic sliding bearings have far greater load-bearing capacity than plastic rolling bearings. Because plastic sliding bearings are subject to sliding friction during use, while plastic rolling bearings are subject to rolling friction, plastic rolling bearings permit greater rotation speeds than plastic sliding bearings.Such other characteristics of plastic sliding bearings and plastic rolling bearings as the ability to withstand high temperatures and chemical corrosion are basically identical when the bearings are made from the same materials;

塑料滑动轴承 塑料滚动轴承


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