Frictional coefficient (reference)

The frictional moment of rolling bearings can be easily compared with that of plain bearings. The frictional moment of rolling bearings can be obtained from their bore diameter, using the following equation :


The friction coefficient is greatly dependent on bearing type, bearing load, rotation speed and lubrication, etc.
Reference values for the friction coefficient during stable operation under normal operating conditions are listed in Table 8-1.
For plain bearings, the value is normally 0.01 to 0.02 ; but, for certain cases, it is 0.1 to 0.2.

Table 8-1 Friction coefficient μ

Bearing typeFriction coefficientμ
Deep groove ball bearing 0.0010~0.0015
Angular contact ball bearing 0.0012~0.0020
Self-aligning ball bearing 0.0008~0.0012
Cylindrical roller bearing 0.0008~0.0012
Full complement type needle roller bearing 0.0025~0.0035
Needle roller and cage assembly 0.0020~0.0030
Tapered roller bearing 0.0017~0.0025
Spherical roller bearing 0.0020~0.0025
Thrust ball bearing 0.0010~0.0015
Spherical thrust roller bearing 0.0020~0.0025
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