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EPB3 Plastic Plain Bearings


Best for middle to high load applications. With the perfect combination of reinforced fibre and good lubrication feature, this material is suitbale to be used under the temperature of 130℃.


Continuous working temperature: -40℃～130℃;


Suitable for medium and high load operation;


Maintenance-free dry operation;


Applicable for various shaft materials;


Good for rotation and oscillating operation;


Excellent dust resistance.


The Material Data Sheet









Typical Item




Standard




Unit




CSB-EPB3






? ?Density




ISO1183




g/cm3




1.46






? ?Color






Dark Grey






? ?Dynamic friction /steel(dry)






0.08-.018






? ?Max. PV (dry)





N/mm2×m/s




0.5






? ?Max. roatating velocity





m/s




1.0






? ?Max. oscillating velocity





m/s




0.7






? ?Max. linear velocity





m/s




4.0






? ?Tensile strength




ISO527




MPa




200






? ?Compressive strength (Axial)





MPa




80






? ?E-module




ISO527




MPa




7700






? ?Max. static pressure of the surface, 20℃





MPa




80






??Shore hardness




ISO868




D




81






? ?Continuous work temperature





℃




-40/130






? ?Short-time work temperature





℃




-40/220






? ?Thermal conductivity




ASTME1461




W/m×k




0.25






? ?Linear coef. of thermal expansion




ASTMD696




K-1×10-5




9






? ?Moisture absorption RH50/23℃




ASTMD570




%




0.7





? ?Max. water absorption, 23℃



%


4.0





? ?Flammability




UL94





HB






? ?Volume resistivity




IEC60093




Ωcm




>1013






? ?Surface resistivity




IEC60093




Ω




>1011









PV Value of Bearings


The max PV value of the CSB-EPB3 series bearing is 0.5N/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 EPB3-1).





The Relation of Load, Speed and Temperature


CSB-EPB3 allows the Max static load of 80Mpa, The max compressive deformation rate under the max load is listed in Graph EPB3-2, The actual load capacity of bearing is slightly less than 80Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.0m/s) results into higher temperature (Tmax: 130℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB3-3 for such variation.








The Friction Factor,Wearing and shaft material


Friction Factor


The friction factor of the sliding bearings is relative to the bearing load, operation speed and the roughness of the shaft material.CSB-EPB3 Bearing Friction factor decreased along with the increasing of the loading (See Graph EPB3-5) and increased along with the increasing of the operation speed(See Graph EPB3-4). The above feature induces the CSB-EPB3 material is applicable for the high load and low speed operation while too smooth and too rough surface may result into the increasing of friction factor. The recommended surface roughness of CSB-EPB3 is Ra0.5~Ra0.8 (See Graph EPB3-6).








CSB-EPB3


Dry


Grease


Oil


Water




Friction coef.?μ


0.08~0.18


0.09


0.04


0.04

















Wearing and shaft material


Test of the bearing against various shaft materials shows that the material CSB-EPB3 features the best performance where the shaft material is carbon steel and hard chrome steel under low loading. (See Graph EPB3-7 and Graph EPB3-8). Therefore, the higher the load is, the more critical the hardness of the shaft will have to be. The softer shaft will be worn off sooner and as a result, the bearing wearing will be increased. But when the loading is increased over 2Mpa, the wearing of the bearing will be better along with the increasing of the shaft hardness. Refer to Graph EPB3-8. It shows that the material CSBEPB3 is better under the oscillation operation comparing with the rotation operation. Under the same condition, the wearing feature of the oscillation operation is much better than that of the rotation operation. This feature is sharply improved under higher loading.








Chemical Resistance


CSB-EPB3 is good at chemical resistance against weak acidic medium and various kinds of lubricants.


Water Absorbability


The water absorb rate of CSB-EPB3 is 0.7% under the atmospheric pressure while it is 4.0% when the material is immerged into water. The application environment has to be considered because of its water absorb properties.





UV Resistance


CSB-EPB3 can maintain its color unchanged when it is exposed into the UV ray. The material performance stays stable.


Bearing Installation


CSB-EPB3 The Interfit Tolerance






Diameter mm




Tolerance after fit E10




Fit Housing H7




Fit Housing?h9






>0～3




+0.014～+0.054




0～+0.010




0～-0.025






>3～6




+0.020～+0.068




0～+0.012




0～-0.030






>6～10




+0.025～+0.083




0～+0.015




0～-0.036






>10～18




+0.032～+0.102




0～+0.018




0～-0.043






>18～30




+0.040～+0.124




0～+0.021




0～-0.052






>30～50




+0.050～+0.150




0～+0.025




0～-0.062






>50～80




+0.060～+0.180




0～+0.030




0～-0.074






>80～120




+0.072～+0.212




0～+0.035




0～-0.087






>120～180




+0.085～+0.245




0～+0.040




0～-0.100





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