REXROTH EcoDrive Cs Project Planning Manual page 155

Rexroth EcoDrive Cs Drives
Nominal bearing service life
DOK-ECODR3-DKC**.3-CS*-PR02-EN-P
Bearing service life
If the MSM motors are operated within the limits specified for radial and
axial loads, the nominal service life of the bearings is as follows:
L = 20.000 operating hours
10h
In other cases, the bearing service life is reduced as follows:
L
10
L : (Bearing service life according to ISO 281, ed. 12/1990)
10h
F : Determined permissible radial force in N (Newton)
radial
F : Actually acting radial force in N (Newton)
radial_ist
Fig. 8-44: Calculation of the bearing service life L
F is exceeded
radial
Note: Under no circumstances may the actually acting radial force
F be higher than the maximum permissible radial force
radial_ist
F .
radial_max
30000
25000
20000
15000
10000
5000
0
0 20
A: at 70% of maximum permissible axial force
B: at 80% of maximum permissible axial force
C: at 90% of maximum permissible axial force
D: at 100% of maximum permissible axial force
Abb. 8-45: Bearing service life depending on radial and axial force
3
F
 
= radial ⋅
20000
 
h
F
 
radial _ ist
 
if the permissible radial force
10h
40 60
radial force [%]
8-33
Motors
A
B
C
D
80 100
motor_lager_lebensdauer.fh7