9.10
Bearings and Shaft Load
9.10.1
Radial Load, Axial Load
During operation, both radial and axial forces act upon the motor shaft and
the motor bearings. The construction of the machine, the selected motor type
and the attachment of driving elements on the shaft side must be adapted to
one another to ensure that the load limits specified are not exceeded.
n= 250 min-1
n= 500 min-1
n= 1000 min-1
n= 2000 min-1
n= 3000 min-1
n= 4000 min-1
n= 6000 min-1
100
200
300
400
500
600
700
800
0
10
20
30
x/mm
Fradial/N
①
②
x
F
axial
F
radial
X
Distance point of force application
F
radial
Permittable radial force
F
axial
Permittable axial force
①
Limiting curve maximal radial force for smooth output shaft
②
Limiting curve for maximum radial force for output shaft with keyway
n=xxxx min
-1
Characteristic curve of maximum radial force for specified average
speed n
m
Fig.9-12:
Example shaft load diagram
Maximum allowed radial force
The maximum permissible radial forceF
radial_max
depends on the following fac‐
tors:
●
Shaft-breaking load
●
Shaft design (plain; with keyway)
Allowed radial force
The permitted radial force F
radial
depends on the following factors:
●
Arithmetically averaged speed (n
mean
)
●
Force action point x
●
Bearing service life
Bosch Rexroth AG
DOK-MOTOR*-MKE*GEN2***-PR06-EN-P
Rexroth MKE Synchronous Motors for Potentially Explosive Areas acc. to ATEX and UL/CSA
84/135
Operating Conditions and Application Notes
LSA Control S.L. www.lsa-control.com [email protected] (+34) 960 62 43 01
