EPB Plastic Plain Bearings
EPB Plastic Plain Bearings
The most common CSB plastic bearing material. It is suitbale for the applications with working temperature not higher than 80?. It is the prefereable material with good wear resistance and economic efficient for a new designation.
Continuous working temperature: -40?~80?;
Very common; suitable for most of average and low load;
Maintenance-free dry operation;
Light wear against different shaft materials;
The Material Data Sheet
Dynamic friction /steel(dry)
Max. PV (dry)
Max. roatating velocity
Max. oscillating velocity
Max. linear velocity
Compressive strength (Axial)
Max. static pressure of the surface, 20?
Continuous work temperature
Short-time work temperature
Linear coef. of thermal expansion
Moisture absorption RH50/23?
|Max. water absorption, 23?|
PV Value of Bearings
The max PV value of the CSB-EPB series bearing is 0.4N/mm2*m/s which determines the load capacity of bearing is inversely proportional to the speed. Please refer to the chart for more detailed information (Graph EPB-1).
The Relation of Load, Speed and Temperature
CSB-EPB allows the Max static load of 35Mpa, The max compressive deformation rate under the max load is listed in Graph EPB-2, The actual load capacity of bearing is slightly less than 35Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax:1.0m/s) results into higher temperature (Tmax: 80?) which decreases the load capacity of the bearing. Please refer to the Graph EPB-3 for such variation.
The Relation of Friction Factor, Wearing and shaft material
CSB-EPB friction factor is not sensitive to the operation speed and bearing loading (see Graph EPB-4 and GraphEPB-5). The above features are the most common considerations for the bearing material selection. The friction of CSB-EPB could be maintained at a relatively lower level so that the good wearing features are guaranteed. From the Graph EPB-6, we could see that the friction factor is variable against the changing of shaft roughness. The recommended shaft roughness is Ra0.3~0.5.
Wearing and shaft material
The shaft material is an important media for the bearing wearing but CSB-EPB is suitable for almost all kinds of shaft materials. Graph EPB-7 and Graph EPB-8 show that the wearing feature of CSB-EPB is excellent when the shaft material are hardened chrome steel or hardened steel or hardened Aluminum.
CSB-EPB is good at chemical resistance against mild base, weak acidic medium and various kinds of lubricants.
The water absorb rate of CSB-EPB is 0.2% under the atmospheric pressure while it is 1.2% when the material is immerged into water. With its low water absorbability, the material is suitable for humid environment applications.
CSB-EPB can maintain its color unchanged when it is exposed into the UV ray. The hardness, Compressive strength and wear resistance of the material is also stable under such condition.
CSB-EPB The Interfit Tolerance
Tolerance after fit E10
Fit Housing H7
Fit Shaft h9