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Rexroth IndraDyn A
Resistance
Vertical mounting positions
IM V3/IM V6
Labyrinth Seal
DOK-MOTOR*-MAD/MAF****-PR03-EN-P
useful life of the sealing lip at the radial shaft sealing ring depends in
cleanliness, lubrication and motor speed.
Note:
Prevent the sealing point from becoming dry and dirty. Always
ensure sufficient cleanliness and lubrication.
The materials used for the radial shaft sealing rings are highly resistant to
oils and chemicals. The performance test for the particular operating
conditions lies, however, within the machine manufacturer's responsibility.
As of the publication date of this document, the following material
assignment is applicable:
MAD/MAF motor ...
100...160
180
225
Fig. 9-27:
IndraDyn A shaft sealing ring
The complex interactions between the sealing ring, the shaft and
the fluid to be sealed, as well as the particular operating conditions
(frictional heat, soiling, etc.), do not allow accurate calculation of the
lifetime of the shaft sealing ring.
However, with a circumferential speed of 5 m/s and under favorable
conditions (e.g. sufficient cleanliness and lubrication), a useful life of
5,000...10,000 h can be realized.
The degree of protection on the flange side of motors with a shaft sealing
ring is IP 65. Hence, tightness is ensured only in case of splashing fluids.
Fluid levels present on the A-side require a higher degree of protection. In
the case of the vertical installation position of the motor, also heed the
notes in the "9.6" section of this chapter ("Vertical Installation").
To protect the motor output shaft against spraying fluids, IndraDyn A
motors of frame size 225 can be directly ordered with labyrinth seal
Please heed the correct order designation of the motors according to
chapter 6, "Type Codes".
The labyrinth seal is provided to prevent the penetration of oil and
splashing water (lubricating coolants etc). into the motor.
However, correct functioning of the labyrinth seal is only ensured when
the motor installation position is horizontal, the position of the drain hole is
always below the output shaft, the fluid level present at the motor is at
least 5 mm below the drain hole (Fig. 7-2), the motor speed is at least 200
rpm.
On delivery, the labyrinth seal at the motor is installed in such a way that
when looking at the A-side of the motors, the terminal box points up and
the drain hole points down (below the output shaft).
Application Notes
Sealing material
Polytetrafluorethylene
Viton
Polytetrafluorethylene
9-23
Abbreviation
PTFE
FKM
PTFE
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