① Radial shaft sealing ring
Fig. 10-5: Radial shaft sealing ring
Wear
Radial shaft sealing rings are abrasive seals. Wear and tear can only be re‐
duced with sufficient lubrication and cleanliness of the sealing point. The lu‐
bricant simultaneously acts as a coolant and supports the dissipation of fric‐
tional heat from the sealing point.
Avoid dry running and soiling of the sealing point.
Under normal ambient conditions, shaft seals are greased for life.
However, unfavorable environmental conditions (e.g. grinding
dust, metal chips) may require maintenance intervals.
Stability
The materials used for radial shaft sealing rings are highly resistant against
oils and chemicals. However, the machine manufacturer is responsible for
the suitability test for the respective operating conditions.
Vertical mounting positions IM V3
Motors with shaft sealing ring have protection class IP65 on the flange side.
The tightness is therefore only guaranteed for splash liquids. Liquid levels on
the A side require a higher protection type. If the motor is installed vertically
(shaft upwards), also observe the instructions in chapter 10.3 "Design and
installation positions" on page 120.
Rexroth recommends avoiding direct contact of the output shaft
and radial shaft seal with the machining medium (cooling lubri‐
cant, material abrasion) due to the machine or system design.
Bosch Rexroth AG DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P124/175
Synchronous Servomotors MSK For Potentially Explosive Areas
Operating conditions and application notes
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