FREUDENBERG SIMRIT
Technical Principles | Informations Techniques
Informaciones Técnicas | Princípios técnicos
31
Technical Principles | Informations Techniques
Informaciones Técnicas | Princípios técnicos
Excessively high pressure must not be permitted to build up in
the unit. A pressure that is too high shortens the service life.
The housing is to be ventilated if there is not sufficient room
available for expansion.
Pressing into the housing
We recommend pressing into the bore with the aid of
mechanical, pneumatic or hydraulic insertion equipment and
an assembly press (
→
Fig. 8).
The axis for the assembly press is the axis of the bore.
An inclined position is not permitted (
→
Fig. 10).
A metal face (assembly press housing) must be present
(
→
Fig. 8,
→
Fig. 9). If this is not possible, a metal face
must be provided on the underside of the fitting equipment.
The press-in force, particularly when installing from the back
side, must be applied as near as possible to the outside
diameter of the seal. The diameter of the assembly press must
be chosen to suit (
→
Fig. 8,
→
Fig. 9). If necessary, please
inquire.
If the diameter of the assembly press is too small, there is a
risk that the seal will bend (
→
Fig. 11).
A mounting plate must be used for hammer assembly (common
with large seals) (
→
Fig. 12). In case of an excessively high
load on a specific point during installation, there is a risk that
the seal will be bent (
→
Fig. 10).
When bonding the seal in the housing, the adhesive may not
under any circumstances come into contact with the shaft or
the sealing lip.
Installing the shaft
A
When fitting over a keyway on the shaft, the groove on the
shaft must be covered with a protective cap (
→
Fig. 14), to
avoid damage to the sealing lip
A
Wall thickness of protective cap < 0,5 mm (0.02 in) to
avoid over-stretching the sealing lip
A
When fitting part of a unit with a pre-assembled seal, a
centering pin should be used to avoid tilting, which would
damage the sealing lip
A
When fitting a long shaft, the use of a guide plate to guide
the shaft parallel is recommended to avoid deformation of
the sealing lip.
A
If parts of the unit with a press fitting and the same nominal
diameter are pushed over the contact area, the diameter of
the contact area is to be reduced by 0,2 mm (0.008 in) to
avoid damage to the contact area. The sealing function is
not impaired by the reduction of the diameter.
Installation of Simmerring with sealing lip made from PTFE
The same recommendations for Simmerring with
elastomer
sealing lip according to DIN 3760 apply to installing Simmer-
ring with PTFE sealing lip.
It is important that the PTFE sealing lip is not damaged, espe-
cially when assembling the front side in the direction of the
installation. The use of a pilot shaft with a chamfer angle of
10° … 15° (
→
Fig. 14) is recommended.
Replacement of Simmerring
New seals must always be installed during the repair or
overhaul of a unit. The sealing lip of the new seal must not be
positioned over the old contact surface. Suitable measures for
achieving this situation are:
A
Installation of spacer rings (
→
Fig. 15)
A
replacement of shaft sleeves or selection of different press-in
depth in the bore.
Wall thickness
max. 0,5 mm (0.02 in)
Fig. 11
Diameter of assembly press too small
WRONG!
Fig. 12
Permissible hammer assembly
USE MOUNT±NG PLATE!
Fig. 13
±nstallation over a shaft with a keyway (also
for a sharp-edged shoulder on shaft)