Support Rollers
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Support
rollers are thick walled needle or cylindrical roller bearings. The crowned
outer surface of the outer ring prevents edge stresses if the roller runs in
a tilted or inclined position. They are grease filled ready-to-mount units
suitable for all types of cam drives, tracks and conveyor systems etc.
The support rollers without axial guidance are supplied in a non-sealed
(open) design and a sealed version. Five series of support roller with axial
guidance are available. Four of the series have the same dimensions,
differing only in their internal design.
Support rollers without axial guidance come in sealed and
unsealed forms and are used for applications where the other components can
provide axial guidance. The support rollers without inner ring are for
arrangements where the pin or shaft can be hardened. The inner rings of
support rollers with inner ring are extended to ensure the required axial
play.
Support rollers with axial guidance are non-separable
units and are especially suitable for applications where lateral (thrust)
surfaces are not available. Side washers that are either loose or pressed on
to the inner ring take up thrust forces due to alignment errors.
Internal clearance - Support rollers are produced with a
radial internal clearance, which corresponds to the ones, specified for
needle roller bearings and cylindrical roller bearings.
Cages - The cages of the support rollers are made of
pressed steel or of polyamide 6,6.
Load Carrying Ability - The outer ring of a support roller
has only a small contact area with the surface. The actual contact area
depends on the load and the crowning. The deformation of the outer ring
caused by this limited contact alters the force distribution in the bearing
and thus has an influence on load carrying ability. Supporting rollers are
used for radial loads. If axial loads act on the outer ring they will
produce tilting moments in the cam rollers.
