The structural composition of plastic coated bearings
The structure of plastic coated bearings consists of two parts: the core bearing component and the outer plastic layer. Some special working condition products may also add auxiliary reinforcement structures.
The core bearing component is the functional core of the plastic coated bearing, which is consistent with the standard rolling bearing structure and includes three basic components:
Inner ring: It fits tightly with the transmission shaft or installation shaft, rotates synchronously with the shaft, and is mostly made of GCr15 bearing steel or 440C/304 stainless steel. The surface is quenched and hardened to improve wear resistance.
Rolling element: a steel ball or roller located between the inner and outer rings, which converts sliding friction into rolling friction, reduces running resistance, and is made of the same material as the inner ring. Its accuracy determines the smoothness of the bearing's rotation.
Outer Ring: A component that is directly bonded to the outer plastic layer. To enhance the adhesion of the plastic layer, the outer wall of the outer ring will undergo special treatment, such as processing circular grooves, rolling, sandblasting to form a rough surface, and some parts will also be coated with special adhesive.
Optional accessories: According to usage requirements, the bearing can be equipped with a retainer (to separate rolling elements and avoid collision wear), a sealing ring/dust cover (to prevent dust and liquid from entering, suitable for harsh environments), and filled with lubricating grease to reduce internal friction.
The outer plastic layer is a differentiated structure of plastic coated bearings, which is tightly wrapped around the outer ring of the bearing through injection molding technology. Its structure and thickness are customized according to the application scenario:
Infrastructure: It is a regular cylindrical or circular ring with a thickness of usually 2-10mm, depending on the load size and installation space.
Special structure: Customized shapes can be designed for different purposes, such as with flange edges (for axial positioning), grooves (for adapting to drive belts), anti slip patterns (to enhance friction), etc.
Material adaptation: The plastic layer material is selected according to the working conditions, such as POM material for high wear resistance scenarios, PU material for shock absorption and noise reduction scenarios, and PP material for corrosion-resistant scenarios.
Auxiliary reinforcement structure (optional) For plastic coated bearings under heavy load, high-speed, or high vibration conditions, additional reinforcement structures will be added:
Fiberglass reinforcement layer: Adding fiberglass to the plastic layer enhances its rigidity and deformation resistance.
Metal inlay: Embedding small metal rings or metal sheets inside the plastic layer to enhance the connection strength with the installation components and prevent deformation and cracking of the plastic layer.
