The Friction Coefficient of Bearings

Time：2017.05.18  Source：Roller Bearings Suppliers

    For easy comparison with sliding bearing , the rolling bearings’ friction moment can be calculated according to the inner diameter by below equation: 

M=uPd/2

In this equation: 

M : stands for friction moment , mN.m

u : friction coefficient

P : bearing load , N

d : bearing nominal bore diameter,mm

    The friction coefficient “u” is greatly affected by bearing type, bearing load, rotating speed and lubrication . In common condition, the reference value of friction coefficient is showed below: 

For sliding bearing , normally , the u = 0.01 - 0.02 , sometimes 0.1 - 0.2

Bearing type                                  Friction coefficient “u”

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 

Tapered roller bearing                 0.0017-0.0025

Spherical roller bearings              0.0020-0.0025

Thrust ball bearing                       0.0010-0.0015