What are the advantages of engineering plastic bearing cage compared with metal cage？

In the process of development of modern rolling bearing technology, in order to improve bearing capacity, optimize bearing design, reduce bearing noise and vibration, improve bearing reliability, extend bearing service life and reduce production cost.The retainer made of engineering plastics has shown its unique superiority.Engineering plastic cage has obvious technical and economic benefits, compared with metal cage, the main advantages are as follows:

1.The cage has good toughness, impact resistance and fracture resistance. The plastic cage has better damage resistance than the metal cage.When the metal cage is severely impacted, it will produce permanent deformation or fracture.And plastic retainer suffers external force temporarily after deformation, reliable its flexibility restores original state.As a result, plastic retainers are less prone to damage.

2.Acid-resistant and corrosion-resistant engineering plastics have better acid-resistant and corrosion-resistant properties than metals and are suitable for application in chemical machinery.

3.The flexibility of the product design of large plastic cage can be directly injected into the shape of complex structural forms, easy to optimize the design of bearings.The plastic retainer can be provided with oil groove at the window hole site, which is convenient for oil storage, thus greatly improving the lubrication condition of the bearing.

4.The retainer has low centrifugal force, low density and low quality.In high-speed rotating bearings, the cage centrifugal force is small, the starting torque is small, the bearing rotation is flexible.

5.Resistance to friction and wear, low temperature rise bearing running, rolling body and cage pocket friction will occur.Since the friction factor between steel and nylon is 0.05, which is far less than 0.20 between steel-steel and 0.15 between steel-copper, the starting torque of plastic cage bearing is smaller than that of metal cage bearing, which is conducive to reducing the generation of friction heat.Especially under the condition of boundary lubrication, the plastic cage bearing has better self-lubrication performance and is not easy to be stuck suddenly when the bearing is in low oil or broken oil.