Couplings, Clutches - Siemens FLENDER B3 E Series Assembly And Operating Instructions Manual

6.8

Couplings, clutches

As a rule, flexible couplings or safety slip clutches are provided for the drive of the gear unit.
If rigid couplings or other in­ and/or output elements, which create additional radial and/or axial forces,
(e.g. gear wheels, belt pulleys, disk flywheels, hydraulic couplings) are to be used, this must be agreed by
contract.
Couplings must be balanced in accordance with the specifications in the pertinent
instructions manual!
For maintenance and operation of the couplings, refer to the specific operating instructions for
the couplings.
When installing the drives, make absolutely certain that the individual components are
accurately aligned in relation to each other. Inadmissibly large errors in the alignment
of the shaft ends to be connected due to angular and/or axial misalignments result in
premature wear and/or material damage.
Insufficiently rigid base frames or sub­structures can also during operation cause
a radial and/or axial misalignment, which cannot be measured when the unit is at
a standstill.
For permissible alignment errors in case of couplings supplied by Siemens, please refer to the
operating instruction manuals for the couplings.
If you use couplings manufactured by other manufacturers, ask these manufacturers which
alignment errors are permissible, stating the radial loads occurring.
Increased system­service life and reliability and reduced running noise can be achieved
through the least possible radial and angular misalignment.
The coupling parts may get out of alignment
due to imprecise alignment during assembly or installation
during operation of the system due to:
heat expansion,
shaft flexure,
too weak machine frames, etc.
Axial misalignment
( Ka)
Fig. 52: Possible misalignments
Alignment has to be done in two axial planes arranged perpendicularly to each other. This can be done by
means of a ruler (radial misalignment) and feeler gauge (angular misalignment), as shown in the
illustration. The aligning accuracy can be increased by using a dial gauge or a laser alignment system.
Ka
Angular misalignment
( Kw)
BA 5033 EN 03/2011
66 / 96
Radial misalignment
( Kr)