Siemens Flender H2NV Series - Shaft Seals; Radial Shaft­sealing Rings; Oil­dam Pipe

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BA 5060 EN 04/2011
5.6 Shaft seals
Radial shaft seals at the shaft outlets prevent oil or grease from escaping from, or dirt from entering into
the gear unit.
5.6.1 Radial shaftsealing rings
Radial shaftsealing rings are the standard type of seal. They are fitted preferably with an additional dust
lip to protect the actual sealing lip from external contamination.
Use in an area with much dust is not possible.
In addition the radial shaftsealing ring on the input shaft is provided with protection
against dry running (see item 5.6.3).
If agreed in the order, instead of the protection against dry running, a regreasable
Taconite seal may be used (see item 5.6.4).
Fig. 8: Radial shaftsealing ring
5.6.2 Oildam pipe
By sealing the vertically downward pointing input shaft with a contactfree and wearfree shaft seal
(a socalled "oildam pipe") the shaft outlet is sealed absolutely tight to prevent oil escaping. This system
is used only for forced lubrication.
The lower antifriction bearing of the output shaft is separated from the gearunit interior by the oildam pipe
and is lubricated by grease. Grease is prevented from escaping by the use of a radial shaft-sealing ring.
The relubrication intervals must be observed for relubrication of the lower bearing
(see section 7, "Startup", and section 10, "Maintenance and repair").
1
2
Fig. 9: Oildam pipe
1 Oildam pipe 2 Lubricating point