Cover or sealing plates for Z and RS bearings are not always adequate for the requirements placed upon them so that they need to be saled in addition with NILOS-Rings. Working in collaboration with the roller bearing industry, NILOS-Rings of types ZAV and ZJV were produced to seal bearings of this type. The job of these NILOS-Rings is to protect against dirt contamination; they prevent above all a relatively quick destruction of the sealing lip in deeep-groove ball bearings of RS design. The design suggestions can only illustrate the fitting of NILOS-Rings in a general way and point out the most likely mistakes.
Most likely mistakes
Image 1: Right installation
Particular attention must be given to the design as far as keyways or grooves are concerned.
The bearing housing does not allow enough space for the seal width. At least 1 mm clearance behind the NILOS-Ring is necessary.
The clamping of the NILOS-Ring is insufficient if the shaft shoulder is too small in diameter; a solution may be the NILOS distancering.
Every sealing element must run absolutely concentric. The NILOS-Ring must therefore according to its application either be centered on the bearing housing or on the shaft.
Problems may occur with this design on the left page regarding the circlip groove and the NILOS-Ring especially during the mounting process. A solution may be the NILOS-Spacer-Ring.