REXROTH IndraDyn A Series, Project Planning Manual

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Rexroth IndraDyn A Application Notes
9-21
Deterioration of the friction seal can be reduced only if lubrication is
sufficient and if the point of contact is clean. Here, the lubricant also acts
as a coolant, supporting the discharge of frictional heat from the contact
area. The lifetime of the lip seal on the radial shaft seal depends on how
clean it is, on the lubrication and on the motor speed.
Note:
Prevent the surface area near the seal from becoming dry and
dirty. Always ensure sufficient cleanliness and lubrication.
The materials used for the shaft seal 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:
Motor MAD/MAF … Sealing material Abbreviation
100...160 Polytetrafluorethylene PTFE
180 Viton FKM
Fig. 9-23: IndraDyn A shaft seal
The complex interactions between the seal, the shaft and the fluid
to be sealed, as well as the particular operating conditions (frictional heat,
soiling, etc.), do not allow for an exact calculation of the lifetime of the
shaft seal.
With a circumferential speed of 5 m/s and in favorable conditions (e.g.
sufficient cleanliness and lubrication), a lifetime of between 5,000 and
10,000 h can nevertheless be achieved.
The international protection rating on the flange side of motors with an
optional shaft seal is IP 65. Hence, impermeability is only ensured against
splashing fluids. Liquid levels present on the motor-output side require a
higher degree of protection. In the case of vertical installations, also heed
the notes in Chapter 9.6 "Vertical Installation".
Resistance to Oil and Chemicals
Vertical Mounting Positions
IM V3/IM V6