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118 KRW
Friction
Load dependent friction moment
M 1 = f 1
. .
P1 dm [Nmm]
M 1 load dependent friction moment [Nmm]
f 1
factor for load intensity (see table)
P1 load applicable for M1 (see table) [N]
D+d
d m Teilkreisdurchmesser d m m=
——– [mm]
2
Factor f 1 and significant load P1 for double row spherical roller bearings
Series f 1 P 1
222 0,0005 · (P0 / C0 ) 0,33
223 0,0008 · (P0 / C0 ) 0,33
231, 240 0,0012 · (P0 / C0 ) 0,5
230, 239 0,00075 · (P0 / C0 ) 0,5
232 0,0016 · (P0 / C0 ) 0,5
241 0,0022 · (P0 / C0 ) 0,5
Source Brändlein: Wälzlagerpraxis
Friction moment for cylindrical roller bearings with additional axial load
M a = f a
M a
f a
1,6 . Fa / e if Fa / Fr > e
Fr {1 + 0,6[Fa / (e . Fr )] 3 } if Fa / Fr ≤ e
. . .
0,06 Fa dm [Nmm]
friction moment of cylindrical roller bearings with
additional axial load [mm]
factor, dependent of axial load and lubrication
conditions, see table.
Fa axial force F a [N]
d m reference diameter [mm]
Factor f a depends on parameter BT:
1
. . . . 2 2
BT = fb ν n — (D -d ) · dm
2
Fa f b
Total friction moment will be:
0,0048 cage bearings
0,0061 cageless bearings
D bearing outer diameter [mm]
d bearing bore diameter [mm]
d m reference diameter [mm]
ν operating viscosity of the lubricating oil or of the
basic oil of the lubricating grease, respectively [mm 2 /s]
n speed [rpm]
F a axial force [N]
M R = (M 0 +M 1 +M a ) [Nmm]
M R total friction moment [Nmm]
M 0 load independent friction moment [Nmm]
M 1 load dependent friction moment [Nmm]
M a
additional friction moment at cylinderrical
roller bearings with axial load [Nmm]
The friction loss is calculated from the total friction moment and the operating speed. The heat transfer conditions
of the bearing and the friction loss determine the operating temperature. From the thermal balance, it is possible to
draw conclusions regarding the required lubrication method.