EPB3 Plastic Plain Bearings

CSB Plastic is one of the leading China epb3 plastic plain bearings manufacturers and suppliers,Website:http://www.csbbearings.com, and also a professional plastic sleeve bearings factory and company, we are always at your services. 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