Technical data

MKE UL/CSA Notes Regarding Application 12-7

DOK-MOTOR*-MKE*UL/CSA*-PR01-EN-P

Drive shaft with shaft seal ring

MKE motors are equipped with radial shaft seal rings according to DIN

3760 – Design A.

RWDR.fh7

(1) Radial shaft seal ring

Fig. 12-9: MKE radial shaft seal ring

Radial shaft seal rings are grinding seals. Therefore, they are

fundamentally exposed to wear and generate frictional heat.

Wear effects of the grinding seal can be reduced only by sufficient

lubrication and cleanliness of the area to be sealed. The lubrication is

simultaneously a coolant and supports the dissipation of the frictional heat

away from the sealing area.

Þ Avoid having the area being sealed from running dry and being

contaminated. Always ensure sufficient cleanliness and lubrication.

The materials used for radial shaft sealrings have a high resistance

against oils and chemicals. However, the machine manufacturer is

responsible for testing the their suitability for the corresponding conditions

of use.

The following material assignment applies (as of the time of printing of

this document):

Motor Seal material Abbreviation

MKE Viton FPM

Fig. 12-10: MKE shaft seal ring

The complex interrelationship between the seal ring, the shaft and

the liquid being sealed against, as well as the corresponding conditions of

use (frictional heat, contamination, etc.) make it impossible to calculate

the lifetime of the shaft seal ring. Experience has shown that, under

unfavorable conditions, an increase in the failure probability can already

occur after 2000 operating hours.

Motors with a shaft seal ring have protection class IP65 on the flange.

Impermeability is thus ensured only in the case of spraying liquids. Liquid

levels pooling on the A side require a higher protection class. In the case

of the vertical installation position (shaft pointing up) of the motor, please

regard the notes in the “Structural shape and installation positions”

section of this chapter.

Rexroth Indramat recommends that direct contact of the drive shaft and

the shaft seal ring with the processing medium (coolant lubricant, material

wear) due to the machine/system construction, be avoided.

Wear

Resistance

Vertical installation positions

IM V3

Note regarding construction