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Notes on project planning
Resistance
Vertical mounting positions IM V3
Design information
7.3.3
Bearings and shaft load
General information
Bosch Rexroth AG R911335703_Edition 04
1
Radial shaft sealing ring
Fig. 7-25:
Radial shaft sealing ring
Wear
Radial shaft sealing rings are rubbing seals. This means that they are subject
to wear and generate frictional heat.
Wear of the rubbing seal can be reduced only if lubrication is adequate and
the sealing point is clean. Here, the lubricant also acts as a coolant,
supporting the discharge of frictional heat from the sealing point.
●
Prevent the sealing point from becoming dry and dirty. Always ensure
adequate cleanliness.
The materials used for the radial shaft sealing rings are highly resistant to oils
and chemicals. However, the suitability test for the particular operating
conditions lies within the machine manufacturer's responsibility.
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 calculating
the lifetime of the shaft sealing ring.
The degree of protection on the flange side of motors with a shaft sealing ring
is IP 65. Therefore, tightness is ensured only in case of splashing fluids. Fluid
levels present on side A require a higher degree of protection. If the motor is
mounted in vertical position (output shaft pointing up), there should not be
any fluid present at the output shaft.
Rexroth recommends that any direct contact of the output shaft and the radial
shaft sealing ring with the processing medium (coolant, material corrosion)
should be avoided by the machine or installation design.
During operation, both radial and axial forces act upon the motor shaft and
the motor bearings. The design of the machine, the selected motor type and
driving elements attached on the shaft side have to be adapted to one
another to ensure that the specified load limits are not exceeded.
IndraDrive Mi Drive Systems with KCU02, KSM02,
KMS02/03, KMV03, KNK03, KLC03
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