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Filament Wound Bearing
What Is A Filement Wound Bearing?

CSB filement wound bearings use continuous fiberglass filaments incorporated into a proprietary epoxy resin matrix for a very high strength bearing that is naturally concentric with no seam or overlap. This structure not only has high strength anti-friction bearings of the main characteristics and permanently without oil. The resulting bearing exhibits a very low coefficient of friction coupled with high load bearing capacity.

Filement Wound Bearing Design
The back material of CRB series material is high strength glass fiber with epoxy resin and the lubricating layer of it is PTFE wound fiber or special lubricating fiber. Therefore, this special structure performs an outstanding anti-wear feature and low friction coefficient under high load and low speed condition. Furthermore, this absolutely new idea gives better solution for high load and excellent wear resistance possibility.
The differences in filement wound bearing construction can be seen most dramatically during three periods: first, how coefficient of friction and wear change during the break-in period,second, how the bearing handles contamination in a dirty or unsealed environment,and third, long term bearing life. Differences in liner construction can also impact performance in the following areas:
• Coefficient of Friction—The required breakaway torque & startup forces required.
• Amount of Wear—The orientation of the PTFE in relation to the mating surface as well as the content of the PTFE will impact the amount of wear the finished journal bearing will exhibit.

A True Self-lubrication Bearing

CSB filement wound bearings not only exhibit excellent load capacities, low frictional values and resistance to corrosion, they also allow for true self-lubrication.CSB recommended that the bearings is used in a completely oil-free condition forever.

Filement Wound Bearing Break-in and Film Transfer
The Filement Wound Bearing’s high load greaseless operation is the use of uniquely woven PTFE super-filaments in the bearing liner. They exhibit tensile strengths twenty times greater than PTFE resins and are not subject to cold flow under high load. No secondary lubrication is necessary due to the film transfer process, even during start-up. As the bearing begins service, the liner’s PTFE undergoes a phase change and disburses over the mating pin surface, transferring from the inner diameter to the pin's wear surface and smoothing out any macroscopic surface imperfections. Essentially, a small amount of the liner is worn away and sacrificed to coat the pin with a low friction PTFE film. This wear is often negligible, usually less than 0.03mm.
This allows the bearing to have a very low coefficient of friction with minimal long-term wear, under high loading conditions. Following the break-in period, the wear rate stabilizes, remaining relatively constant for the bearings’ life.
The elapsed time for break-in is PV (Pressure and Velocity) dependent. The equilibrium wear rate varies from operation to operation, due to a number of factors including:loads, speeds, shaft hardness, material, and shaft surface finish.
CSB filement wound bearings are designed to minimize wear; however, the bearing wear is dependent on general operating conditions, such as speed, sliding distance and load. With intermittent rotation or oscillation, radial wear should be negligible over thousands of hours. Hard chrome plating gives excellent wear performance and protects the shaft from corrosion.


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