Lust CDA3000 - Page 322

Engineering Guide CDA3000
A-31
Appendix A Formula bank
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EN
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7
A
Coefficients of friction for bearing friction
Coefficients of friction for roller bearing friction
Coefficients of friction for spindles
Coefficients for rim and side friction
Bearing type Coefficient of friction
Roller bearing µ = 0.001 to 0.005
Friction bearing µ = 0.08 -0.1
Table 7.17 Coefficients of friction for bearing friction
Roller bearing Coefficient of friction
Axial groove ball bearing 0.0013
Radial self-aligning ball bearing 0.0010
Radial self-aligning roller bearing 0.0018
Radial groove ball bearing 0.0015
Radial taper roller bearing 0.0018
Radial cylinder roller bearing 0.0011
Radial needle bearing 0.0045
Table 7.18 Coefficients of friction for roller bearing friction
Spindle type Coefficient of friction
Trapezoidal threaded spindle
µ = 0.05 - 0.08 (greased)
µ = 0.1 - 0.18 (dry)
Recirculating ball spindle
µ = 0.005 -0.05
Table 7.19 Coefficients of friction for spindles
Wheel type Coefficients for rim and side friction
Roller bearing supported wheels c=0.003
Friction bearing supported wheels c=0.005
Side guide rollers c=0.002
Table 7.20 Coefficients for rim and side friction