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Your benefits at a glance

Wear reduced
on the sealing lip by about 50%

Expected service life longer
by a factor of 2 (compared to other systems on the market), which means longer maintenance intervals

No run-in
or wear on the shaft – replacement oil seals can be installed at the same location

Improved reliability
against leakage with increased system availability

Sealing solutions for gearmotors

Oil seals are subject to increasing boundary conditions in today's production systems. For example, our gear units and thus the sealing systems are used in machines that run at variable speeds or in continuous duty and thus change the temperatures of the drive system. Depending on the capacity utilization, the internal pressure of a gear unit also varies.

We use special sealing systems to protect your system from escaping lubricant, our gear unit from entering dirt and the motor from escaping oil from the gear unit.

In addition to the conventional oil seals, we offer you two sealing rings that have been specially developed for us as an option: The Premium Sine Seal and the Premium Sine Seal conductive. Together with Freudenberg Sealing Technologies, these oil seals were developed for the input motor shaft of gearmotors/mounted gearmotors and are only used in conjunction with a gear unit.

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The two keep tight

The Premium Sine Seal oil seals are available in two designs: Standard for an extended service life and with special fleece to prevent harmful leakage currents via the bearings.

Your advantage: The sinusoidal sealing lip means that both the Premium Sine Seal and the Premium Sine Seal conductive have a significantly longer shelf life and, in case of service, the new oil seal can be used at the same point on the shaft, as the Premium Sine Seal does not cause the shaft to run in. Due to the special shape of the sealing lip, the contact on the rotating shaft is larger, which results in better heat dissipation and also promotes lubricant exchange on the sealing surface.

Electrically conductive fleece – strong effect against electrical erosion

An electrically conductive fleece is attached to the Premium Sine Seal conductive as a contact bridge for the current between the housing and the shaft. The fleece protects the bearings from harmful leakage currents within the drive unit. This prevents premature bearing failure and significantly extends the service life of the bearings.

  • Internal membrane with applied sinusoidal sealing lip. The usual ring spring is omitted.
  • Increased contact surface of the sinusoidal sealing lip leads to better temperature dissipation
  • Protects the motor against oil (input side)
  • Protects the gear unit interior (no leaks)
  • Generates less heat at the sealing lip
  • Expected service life of about 20 000 h
  • No grease required
Sealing systemDesignRecommended useRecommended maintenance interval
NBR
Standard sealing system

Material:
High-quality NBR
(Acrylonitrile butadiene
Rubber)1)
Radial oil seal
  • Rotational speeds up to 1800 min-1
  • Temperature range
    -40 °C to
    +80 °C
≈ 10000 h
FKM
Sealing system for increased
Speeds
and/or increased
Temperatures

Material:
High-quality FKM
(Fluorocarbon rubber)1)
Radial oil seal with optimization
  • Rotational speeds up to 4500 min-1
  • Temperature range
    -25 °C to
    +115 °C
  • S3 operation (high
    Switching frequencies)
≈ 10000 h
Premium Sine Seal
Premium sealing system
for longer periods
Service life

Material:
High-quality FKM
(Fluorocarbon rubber)1)
Premium Sine Seal
  • Rotational speeds up to 4500 min-1
  • Temperature range
    -25 °C to
    +115 °C.
  • S3 operation (high
    Switching frequencies)
  • extended
    maintenance interval
  • in particular
    recommended with
    GearOil by
    SEW-EURODRIVE
≈ 20000 h
Premium Sine Seal conductive
Sealing system for avoidance
of current continuity

Material:
High-quality FKM
(Fluorocarbon rubber)1),
Non-woven material with electrical
conductive properties
Premium Sine Seal
with electrically conductive
properties
  • Rotational speeds up to 4500 min-1
  • Temperature range
    -25 °C to
    +115 °C
  • S3 operation (high
    Switching frequencies)
  • Current continuity
    In the motor bearings
  • in particular
    recommended with
    GearOil by SEW-EURODRIVE
≈ 10000 h

1) According to SEW-EURODRIVE specification 97 118 __15.

  • Packaging machines
  • Food and beverage industry
  • Wood processing
  • Baggage handling systems in airports
  • Automotive production
  • Transport and logistics
  • Handling and robotics
  • Processing
  • And many more

The radial oil seals are available as an option for our CM3C../CMP.. synchronous servomotors as also for our DR.., DRN/DR2S.. und DAS.. asynchronous motors.

It can be combined with:

  • Helical gear units of the R series
  • Parallel-shaft helical gear units of the F series
  • Helical-bevel gear units of the K series
  • Helical-worm gear units of the S series
  • Right-angle gear units of the W series
  • Planetary servo gear units of the PS.F series
  • Helical-bevel servo gear units of the BS.F series

The radial oil seals can also be ordered as an option for our MOVIGEAR® mechatronic drive units.