Output Shaft With Shaft Sealing Ring - Bosch Rexroth MAD Project Planning Manual

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Application notes
Balancing with a half key
Balancing with complete key
9.12.3

Output shaft with shaft sealing ring

Bosch Rexroth AG R911295781_Edition 11
1
2
3
4
① Key
② Keyway
③ Motor shaft
④ Centering hole
Fig. 9-10: Output shaft with keyway
In addition, the machine elements to be driven have to be secured in axial di‐
rection via the centering hole on the end face.
⇒ Avoid strong reversing operation.
⇒ Deformations in the area of the keyway can lead to breakage of
the shaft.
⇒ The key is included in the scope of delivery of the motor.
The motor is balanced with a half key. Mass ratios are comparable to those
of a plain shaft. If a complete key is inserted, there will be an imbalance
which has to be compensated at the machine element to be driven.
The hub of a machine element to be driven (pinion, pulley, etc.) should corre‐
spond to the length of the key.
If the hub is shorter, use a graduated key.
The motor is balanced with the supplied key. That means that the machine
element to be driven has to be balanced without key. The keyway length in
the hub is independent of the length of the keyway.
Modifications to the keys can only be made by the users themselves and
within their own responsibility. Bosch Rexroth does not give any warranty for
modified keys or motor shafts.
If equipped with the optional radial shaft sealing ring according to DIN 3760 -
design A, MAD/MAF motors are, e.g., suitable for attachment in a dusty envi‐
ronment and in moist rooms or for attachment of gears with closed oil bath or
oil circulation lubrication.
If the motor is used in strong atomized spray or at speeds over
4000 min , we recommend ordering the motor with additional lab‐
-1
yrinth seal (see
on page 211).
Fluids (e.g., cooling lubricants, gear oil, etc.) may not be present
at the output shaft. If, e.g., gears are attached, only gears with a
closed (oil-tight) lubrication system may be used.
MAD / MAF Asynchronous Housing Motors
chapter 9.12.4 "Output shaft with labyrinth seal"