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DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P
Synchronous Servomotors MSK For Potentially Explosive Areas
10.8
Bearing lifetime
Bearing lifetime with increased ra‐
dial force
The bearing lifetime for MSK-ATEX motors for operation within the specified
limits for radial and axial load and for ambient conditions is:
L
= 30000 h (calculation acc. to ISO 281, edition 12/1990)
10h
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.
Calculation of mechanical bearing lifetime at increased radial force:
L
Bearing service life (according to ISO 281, Version 12/1990)
10h
F
Determined allowed radial force in N (newton)
radial
F
Actually acting radial force in N (newton)
radial_act
Fig. 10-10:
Calculation of bearing lifetime L10h at increased radial force:
The actually acting radial force F
the maximum allowed radial force F
Bosch Rexroth AG
Operating conditions and application notes
may never be higher than
radial_act
.
radial_max
129/175
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