Motor components (options)
5.3 Radial sealing ring
1PH7 induction motors (Machine tools)
Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
193
5.3 5.3 Radial sealing ring
For mounting a ZF gearbox, a radial shaft sealing ring according to DIN 3760 is optionally
installed in the motor at the DE.
Figure 5-2 Radial sealing ring
The sealing lip must be adequately cooled and lubricated using the gearbox oil to guarantee
reliable and safe functioning of the radial shaft sealing ring.
Note
Radial shaft sealing rings are seals that are in constant contact. This is the reason that they
are subject to wear and generate heat due to friction.
Sealing ring wear can only be reduced using adequate lubrication and ensuring that the
sealing location is clean. In this case, the lubricant also acts as a cooling medium and
supports the dissipation of heat caused by friction from the sealing location.
If a radial shaft sealing ring runs dry, then this has a significant negative impact on the
functionality and the lifetime.
Degree of protection
1PH7 motors with radial shaft sealing ring have, on the flange side, degree of protection
IP65. This means that the sealing effect is only guaranteed when the appropriate liquid is
sprayed onto it. Liquid must be prevented from collecting at the DE as well as jets of oil.
Otherwise, a higher degree of protection is required or additional measures must be taken.
Note
The complex interaction between the sealing ring, shaft and liquid to be sealed as well as the
application conditions (heat due to friction, accumulated dirt etc.) make it impossible to
calculate the lifetime of the shaft sealing ring. Under unfavorable conditions, from
experience, an increased probability of failure can occur after 2000 operating hours.
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