Bearing Variants And Shaft Load; Bearing Variants - Bosch Rexroth MAD Project Planning Manual

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Application notes
Modifying the position of the drain
hole of the labyrinth seal
9.13

Bearing variants and shaft load

9.13.1

Bearing variants

Bosch Rexroth AG R911295781_Edition 11
On delivery of the motor, the labyrinth seal is mounted such that, as seen
from side A of the motors, the terminal box and the power plug are positioned
at the top and the drain hole of the labyrinth seal is positioned at the bottom
(below the output shaft).
There are certain installation situations where the motor has to be
installed with the power connection being positioned laterally or
facing down. In these cases, the flange of the labyrinth seal has
to be turned before installation of the motor such that the drain
hole is again positioned below the output shaft.
If the motor is not mounted as delivered (power connection at the top), the
position of the drain hole of the labyrinth seal has to be adjusted.
To achieve this, the flange of the labyrinth seal can be rotated in 30° incre‐
ments. In this manner, the drain hole can be quickly adjusted to the condi‐
tions of the machine, i.e., aligned downwards.
1
① Drain hole (always align the drain hole downwards in relation to
the motor installation position)
② Mounting screws M6 DIN912 (4 pcs. for MAx225)
Fig. 9-12: Allowed position of the drain hole of the labyrinth seal (example
MAD130)
To put the drain hole into the correct position, the following working steps
have to be carried out before the motor is mounted:
1. Unscrew the mounting screws ②.
⇒ To facilitate unscrewing the screws, heat them up to approx. 70 °C
since they are locked with Loctite 243 screwlock.
2. Observe the required installation position of the motor and turn the
flange into the position in which the drain hole ① is again positioned be‐
low the output shaft.
3. Apply Loctite 243 to the mounting screws and screw them into the corre‐
sponding threaded holes through the holes in the flange.
⇒ Observe the 30° increments!
⇒ Tightening torque of the mounting screws: 9 Nm.
The following bearing variants are available depending on the frame size of
the MAD/MAF motors:
● Standard bearing "N" = deep-groove ball bearing
● A-side fixed bearing "A" = deep-groove ball bearing
MAD / MAF Asynchronous Housing Motors
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