10.6 Output shaft
10.6.1 Plain shaft
The recommended standard version for MSK motors offers a force-fit, back‐
lash-free shaft-hub connection with very quiet running. Use clamping sets,
clamping sleeves or tensioning elements to couple the machine elements to
be driven.
10.6.2 Output shaft with keyway
The optional key according to DIN 6885, Sheet 1, Edition 08-1968, allows
form-locking transmission of torques with constant direction and low require‐
ments for the shaft-hub connection.
① Key
② Keyway
① Motor shaft
① Centering hole
Fig. 10-4: Output shaft with keyway
In addition, the machine elements to be driven must be secured axially via
the frontal centering hole.
Damage to property due to reversing mode!
Shaft damage! In case of intense reversing operation, the seat of the fitting
spring may deflect. Increasing deformations can lead to a break of shaft.
Preferably, use plain output shafts.
Balancing with full key
MSK motors are balanced with full key. The machine element to be driven
must therefore be balanced without key.
10.6.3 Output shaft with shaft sealing ring
MSK motors are designed with radial shaft sealing rings according to DIN
3760 - version A.
DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P Bosch Rexroth AG 123/175
Synchronous Servomotors MSK For Potentially Explosive Areas
Operating conditions and application notes
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