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Introduction NILOS-RING
DIFKU, DISKU special rings
10 points to be noted
The 10 points
Circumferential speeds
Fitting Rules
Design suggestions

The 10 points

Filling the NILOS-Ring with grease

In order to reduce the moment of friction during first start-up, the dished sealing groove is to be filled with grease before fitting. Once the NILOS-Ring has been fully run in, it does not need any further maintenance.

Grease chamber in the NILOS-AK-Ring

The space between the two sealing edges of the NILOS-AK-Ring should likewise be filled with grease before installation. Under normal operating conditions the type of grease used to lubricate the taper roller bearings can also be used. In special cases, especially if it is necessary to take into account a severe intrusion of water into the bearing position, the grease chamber should be filled with a water-repellent sealing grease.

Sealing effect

Sealing is produced by placing the sealing edge of the NILOS-Ring under light pressure at the inner or outer roller bearing ring and so that it rubs to a greater or lesser depth into the hardened roller bearing ring. The fine labyrinth that is produced as a result prevents both the leaking of grease and also the penetration of dirt into the bearing.
If the design allows it, inner-sealing NILOS-Rings should be used in all cases.

Basic rule: Concentric location

As with all sealing elements, the sealing edge of the NILOS-Ring must be exactly concentric. This is the only way to produce the sealing effect required for the labyrinth groove. The externally-sealing NILOS-Ring should be installed so that it rubs lightly on the shaft, the inner sealing ring must be located centrally within the bearing casing hole.
The inner and outer edges of the inside recess should therefore not be on or in threads, thread runouts, pushed-up sections or hollow sections. The radius at the shaft or casing shoulder must be ≤ 0.1.

Space required “h1”

Installation height “h” is given as the maximum dimension within the dimensional tables down to which there is no effect on the sealing action. It is therefore always sufficient if the space required is taken into consideration with “h1” = h + 1 mm.

Non-slip clamping required

The NILOS-Ring must not slip at the clamping point. With an externally-sealing NILOS-Ring a firm location of the roller bearing into the shaft shoulder is adequate for non-slip clamping, and in the case of an internally-sealing NILOS-Ring the type of clamping elements normally used are also adequate.

Self-aligning and barrel-type bearings

Self-aligning and barrel-type bearingsNILOS-Rings can be used if these bearings are to be used only due to their higher loading capacities. The NILOS-Ring is not suitable for sealing if these bearings are to be used according to their intended purpose for self-aligning movements >1°.

Cylindrical roller bearings without rim

NILOS-Rings of type LSTO should be used exclusively for these and a series of similar bearings, since they can accommodate the axial shifts of these bearings to a certain extent (max. 0.3 mm).

Taper roller bearings

NILOS-Rings of type AV, JV and AK are suitable to seal taper roller bearings for the bearing sides quoted. The installation of the taper roller bearings and also the associated NILOS-Rings must be done with particular care and accuracy to ensure that the sealing edges of the NILOS-Rings are not damaged.

Connection dimensions

The NILOS-Ring fits all roller bearings with rounding and shoulder heights as per DIN 5418, with the exception of the smallest bearings. In the case of roller bearings of makes that deviate from this, it is possible to provide special configurations of NILOS-Rings as necessary. The connection dimensions for NILOS-Rings of type AK are given separately in the relevant dimensional tables.