Technical data

L
10h
(Bearing lifetime according to ISO 281, ed. 12/1990)
F
radial
Determined permissible radial force in N (Newtons)
F
radial_ist
Actually acting radial force in N (Newtons)
Fig.9-18: Calculation of the bearing service life L10h if the permissible radial force
Fradial is exceeded
Under no circumstances may the actually acting radial force
F
radial_ist
be higher than the maximum permissible radial force
F
radial_max
.
9.8 Attachment of Drive Elements
For all attachments of drive elements to the drive shaft, such as
● Gearboxes
● Couplings
● Gear pinion
it is imperative that the following notes are observed.
Are gearboxes mounted on motors, the thermal coupling of the motors on ma-
chines or constructions changes.
Depending on the gearbox type, the heat development on the gearbox is dif-
ferent. The heat dissipation of the motor via the flange is reduced in every case
when a gearbox is mounted. This must be heeded at project planning.
A reduction of the given performance data is necessary, to do not overload
motors when using gearboxes.
Fig.9-19: S1 characteristic curve of gearboxes
The indicated torques in the characteristic curves of the motor have
to be reduced by 10-20% when mounting gearboxes.
Please, heed all further notes and specifications within this documentation for
the used gearboxes.
Generally, redundant bearings are to be avoided by all means when connecting
drive elements. The tolerances inevitably present in such cases will lead to
Gearbox mounting on motors
Overtermined Bearing
166/194 Bosch Rexroth AG | Electric Drives
and Controls
Rexroth IndraDyn S | Project Planning Manual
Operating Conditions and Application Notes