Description
Cylindrical roller bearingshave rollers, which are cylindrical, are
in linear contact with the raceways. They have a high radial load
capacity and are suitable for high speeds. There are different
types designated NU, NJ, NUP, N, NF for single row bearings, and
NNU, NN for double row bearings depending on the design or absence
of side ribs.
The outer ring and inner rings of all types are separable.
Some cylindrical roller bearings have no ribs on either the inner
ring and outer ring, so the rings can move axially relative to each
other. These can be used as free-end bearings.
Cylindrical roller bearings, in which either the inner or outer
rings has two ribs and the other ring has one, are capable of
taking some axial load in one direction.
Double row cylindrical roller bearings have low sectional height,
high load carrying capacity and little resilience. They enable
stiff bearing arrangements for the support of heavy loads to be
made and are mainly employed in machine tools and rolling
mills.
Pressed steel or machined brass cages are generally used, but
sometimes molded polyamide cages are also used.
Cylindrical roller bearingsare manufactured to normal tolerances
and have normal radial internal clearance as standard.
