Bosch MSK030B-0900-NN, Project Planning Manual

Page: 216 / 282

9.7 Bearing and shaft load
9.7.1 Radial load, axial load
During operation, radial and axial forces act on the motor shaft and the motor
bearings. The design of the machine, the selected motor type and the shaft-
side mounting of drive elements must be coordinated to ensure that the
specified load limits are not exceeded.
x Point of application of force
Fig. 9-6: Example diagram of shaft load
Maximum allowed radial force The maximum permissible radial force F
radial_max
depends on the following
factors
●
Shaft breaking load
● Force action point x
● Shaft plain or with keyway
Permissible radial force
The permissible radial load F
radial
depends on the following factors
● Arithmetically averaged speed (n
average
)
● Force action point x
● Bearing service life
Permissible axial force The maximum permissible axial force F
axial
for the individual motor sizes is
shown in the following table.
Motor F
axial
[N] Motor F
axial
[N]
MSK030 0 MSK075 60
MSK04x 30 MSK076 60
MSK050 40 MSK100 80
MSK060 40 MSK101 80
MSK061 40 MSK103 80
MSK070 60 MSK131 50
MSK071 60 MSK133 50
Tab. 9-8: Maximum permissible axial force F
axial
Axial forces are permissible without restriction up to the specified values.
Larger axial forces may be possible after detailed examination by your
Rexroth sales partner. Specify the following information for the valuation:
●
Axial and radial force with force application point
● Installation position (horizontal, vertical with the shaft end pointing to the
top or bottom)
● Average speed
Average speed Run-up and braking times can be omitted from the calculation if the time dur‐
ing which the drive is operated at constant speed is considerably longer than
Bosch Rexroth AG DOK-MOTOR*-MSK********-PR12-EN-P 214/279
Synchronous Servomotors MSK
Operating conditions and application notes