Bosch MSK030B-0900-NN, Project Planning Manual

Page: 221 / 282

9.8 Bearing lifetime
The bearing lifetime for MSK motors for operation within the specified limits
for radial and axial load and for ambient conditions is:
L
10h
= 30000 h (calculation acc. to ISO 281, edition 12/1990)
Different loads may have the following effects:
●
Premature failure of the bearing due to increased wear or mechanical
damage.
● Reduction of the grease lifetime leads to premature failure of the bear‐
ing.
Bearing lifetime with increased ra‐
dial force
Calculation of mechanical bearing lifetime at increased radial force:
L
10h
Bearing service life (according to ISO 281, Version 12/1990)
F
radial
Determined allowed radial force in N (newton)
F
radial_act
Actually acting radial force in N (newton)
Fig. 9-11: Calculation of bearing lifetime L10h at increased radial force:
The actually acting radial force F
radial_act
may never be higher than
the maximum allowed radial force F
radial_max
.
DOK-MOTOR*-MSK********-PR12-EN-P Bosch Rexroth AG 219/279
Synchronous Servomotors MSK
Operating conditions and application notes