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BA 5010 EN 03.10
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 cannnot be measured when the
unit is at a standstill.
For permissible alignment errors in the case of couplings supplied by FLENDER, 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 system service 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
• by imprecise alignment during assembly or installation
• during operation of the system by:
─ heat expansion, shaft flexure, too weak machine frames, etc.
ΔKa
Axial misalignment
(ΔKa)
Angular misalignment
(ΔKw)
Radial misalignment
(ΔKr)
ΔKw
ΔKr
Fig. 57: 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.