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Plastic Bearing Technical Reference

Load capacity calculation


 

As the factor of clearance, bushes chamfer, oil groove ect., The actually load (Pact) is higher than theory of calculation (Pmean).
Maximum surface static load


The actual dynamic load (Graph 6) is usually less than the maximum surface static load recommended in the data sheet. Due to the clearance exists between the shaft and bearings, the actual working surface area are not the same as the projected area of the bearing. The working area is depended on the clearance between the shaft and the bearing. The value in the datasheet is valid when the shaft is not moving or the operating speed is less than 0.01m/s. The value could also be applicable for a short run (shorter than 3 minutes) condition.

图表6 CSB Max static load


The load, temperature and speed


 The load capacity will be decreased along with the temperature increase. Load capacity may sharply decrease when the operating temperature is higher than the recommended maximum temperature (Graph 7). The load capacity will be decreased along with the speed increase. Speed increase will result into a temperature increase that decreases the load capacity.

Graph 7: Load vs Temperature

The operating speed is one of the key parameters for the sliding bearings. The friction between the sliding bearing and the shaft is a linear friction. So the operating speed of sliding bearing is much less than that of a rolling bearing where the friction is a rotation method. The speed here is the relative linear speed between the bearing and the shaft but not a rotation speed.
Calculation of Linear Speed

Bearing Speed


The maximum operating speed: Rotation, Oscillating, Linear indicates the maximum allowable speed (Graph 8). The value in the datasheet is calculated under the condition of a very low load. So the actual allowable speed will be limited against different load and other conditions. The higher the load, the lower the speed will be. The speed and the temperature is in a inverse proportion relation, the maximum speed allowable will be different depending on different operation method of the bearings.
Graph 8: Max Operating Speed                                                      Graph 9:Max Operating Temperature
Bearing Temperature
There is a limited temperature range that CSB-EPB Series bearings could be used. The lowest temperature is the one the material will become brittle under that value (Graph 10) and the highest temperature is the one the bearing material wear resistance feature will start to change (Graph 9). If the bearings are used under the conditions of alternatively changing high and low temperature, the bearing feature will be considerably affected and thus shorten the bearing service life.
Graph 10: Min Operating Temperature

Material

Min Temperature Material Min Temperature Material Min Temperature
CSB-EPB -40 CSB-EPB5Z -100 CSB-EPB15 -40
CSB-EPBH -40 CSB-EPB6 -40 CSB-EPB16 -40
CSB-EPB1 -50 CSB-EPB6A -40 CSB-EPB17 -200
CSB-EPB2 -50 CSB-EPB7 -40 CSB-EPB17A -200
CSB-EPB2D -40 CSB-EPB8 -40 CSB-EPB18 -50
CSB-EPB3 -40 CSB-EPB9 -40 CSB-EPB19 -40
CSB-EPB3G -40 CSB-EPB10 -100 CSB-EPB20 -50
CSB-EPB3M -40 CSB-EPB11 -40 CSB-EPB21 -40
CSB-EPB4 -40 CSB-EPB12 -40 CSB-EPB22 -40
CSB-EPB4H -40 CSB-EPB13 -50 CSB-EPB23 -100
CSB-EPB5 -100 CSB-EPB14 -200 CSB-EPB24 -40
CSB-EPB5A -100 CSB-EPB14A -200 CSB-EPB25 -100
Graph11:Temperatue at which additional securing of the bearing is required

Material

Min Temperature Material Min Temperature Material Min Temperature
CSB-EPB 50 CSB-EPB5Z 145 CSB-EPB15 65
CSB-EPBH 50 CSB-EPB6 50 CSB-EPB16 90
CSB-EPB1 60 CSB-EPB6A 50 CSB-EPB17 140
CSB-EPB2 55 CSB-EPB7 60 CSB-EPB17A 140
CSB-EPB2D 50 CSB-EPB8 100 CSB-EPB18 90
CSB-EPB3 100 CSB-EPB9 105 CSB-EPB19 65
CSB-EPB3G 90 CSB-EPB10 145 CSB-EPB20 80
CSB-EPB3M 60 CSB-EPB11 50 CSB-EPB21 80
CSB-EPB4 120 CSB-EPB12 50 CSB-EPB22 100
CSB-EPB4H 120 CSB-EPB13 60 CSB-EPB23 140
CSB-EPB5 135 CSB-EPB14 135 CSB-EPB24 110
CSB-EPB5A 130 CSB-EPB14A 135 CSB-EPB25 140

Bearing UV- resistance Performance


Bearings used for outdoor equipments are constantly exposed to different critical environment. Anti-UV property is one of the most important indexes of a variety of bearing materials to resist UV-ray damage. CSB-EPB Series plastic bearing UV-resistance reference (Graph 16).


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Bearing Design System