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Apparecchi di misura di precisione. Sensori e Sistemi
per grandezze elettriche, termiche e meccaniche
3
Mechanical Assembly
For the assembly of a torque sensor in a shaft line, we always recommend to use couplings which can be misaligned.
3.1
Couplings
We recommend multi-disc couplings for our torque sensors. Couplings must be able to balance an axial, radial or
angular offset of the shafts and not allow large forces to act on the sensor. The assembly instructions of the
respective coupling manufacturer must be considered.
During the assembly, the sensor must be supported to protect if from falling down
.
3.1.1 Misalignment Possibilities of Single-Jointed Couplings
Note
: Radial misalignments are only possible in the combination of
single-jointed coupling - torque sensor (as adapter) - single-jointed coupling.
Thus, with both single-jointed couplings the torque sensor forms a double-jointed coupling.
3.1.2 Double-Jointed Couplings
Double-jointed couplings are used for the balance of inevitable angular, axial and radial misalignments.
3.1.3 Alignment of the Measurement Arrangement
Precisely alignment of the couplings reduces the reaction forces and increases the durability of the couplings.
Disturbance variables are minimized as well.
Due to the multitude of applications, an alignment of the coupling with a straight edge in two levels, vertical to each
other, is sufficient.
However, in drives with high speed an alignment of the coupling (shaft ends) with a dial gauge or a laser is
recommended.
For further references see coupling manual
.
3.2
General
Before the assembly, shafts must be cleaned with dissolver (e.g. acetone), no foreign particles may
adhere to them. The hub must fit corresponding to the connection.
Connections with Clamping Piece:
The indications of the clamping piece manufacturer must be considered. The clamping piece must be able to transfer
the arising torques safely.
Caution:
During the assembly inadmissibly large forces may not act on the sensor or the couplings. At
small torques (< 20 N·m) connect the sensor electrically during the assembly and observe the signal, the
measurement signal may not exceed the limit values
Angular Misalignments
Axial Misalignments
Radial Misalignments
