REXROTH MKD025A-144, Manual

Page: 130 / 184

13-12
Application Instructions Synchronous Motors MKD
19.05.2004 Version7.0 DOK-MOTOR*-MKD*******-PR07-EN-P
Rexroth recommend that any direct contact of the output shaft and the
radial shaft sealing ring with the processing medium (coolant, material
corrosion), caused by the type of machine or system construction,
should be avoided.
Bearings and Shaft Load
During operation, both radial and axial forces act upon the motor shaft
and the motor bearings. The construction of the machine and the
attachment of driving elements on the shaft side must be adjusted to one
another to ensure that the load limits specified are not exceeded.
Radial load, axial load
x/mm
n
mean
F
radial
F
radial-max
F
radial-max
(shaft with
keyway)
F
radial-max
(plain shaft)
1 2
Faxial
Fradial
x
welle_allg_en.fh7
(1): F
radial_max
(plain shaft)
(2): F
radial_max
(shaft with keyway)
Fig. 13-18: Example of a shaft load diagram
The maximum permissible radial force F
radial_max
depends on the following
factors:
•
Shaft break load
•
Point of force application x (see Fig. 13-18)
•
Shaft design (plain; with keyway)
The permissible radial force F
radial
depends on the following factors:
•
Arithmetic mean speed (n
mean
)
•
Point of force application x (see Fig. 13-18)
•
Bearing service life
The maximum permissible axial force F
axial
is proportional to the radial
force. Please refer to the section entitled “Shaft load” in the technical
data for the proportionality factor.
Note on construction
Maximum permissible radial
force F
radial_max
Permissible radial force F
radial
Permissible axial force F
axial