Technical data

12-8 Notes Regarding Application MKE UL/CSA
DOK-MOTOR*-MKE*UL/CSA*-PR01-EN-P
Bearing and shaft load
During operation, radial and axial forces affect the motor shaft and the
motor bearing. The construction of the machine and the attachment of
drive elements to the shaft must be attuned to one another in order to
ensure that the provided load limits are not exceeded.
Radial load, axial load
x/mm
n
mittel
F
radial
F
radial-max
F
radial-max
(Welle mit
Passfedernut)
F
radial-max
(glatte Welle)
1
2
F
axial
F
radial
x
welle_allg.fh7
(1): F
radial_max
(smooth shaft)
(2): F
radial_max
(keyed shaft)
Fig. 12-11: Example diagram of shaft load
The maximum permissible radial force F
radial_max
depends on the following
factors:
· shaft /force load
· distance x of the point of application of force (see Fig. 12-11)
· design of the drive shaft (plain or with keyway)
The permissible radial force F
radial
depends on the following factors:
· arithmetically determined average rotational speed (n
avg
)
· distance x of the point of application of force (see Fig. 12-11)
· Bearing lifespan
The maximum permissible axial force F
axial
is proportional to the radial
force. The factor of proportionality factor can be found in the Technical
Data, in the “Shaft load” section.
Maximum permissible radial
force F
radial_max
Permissible radial force F
radial
Permissible axial force F
axial