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The outer rings of regular ball and roller bearings are typically
mounted in rigid housings providing support around the entire
circumference. Individual roller forces are transmitted through the outer
ring directly into the housing with no major deformations.
By contrast, cam followers and yoke rollers are supported at a single
point on their circumference. Individual roller forces produce bending
moments on the outer ring around the point of contact. The effects are
outer ring deformation with reversed bending stresses in dynamic
applications, a reduced load zone, and a higher maximum roller load.
INA Cam Followers
To keep deformation to a minimum, the outer ring of a cam follower must
have a considerably heavier cross section than a standard bearing. This
requirement conflicts with the desire for maximum dynamic bearing capacity
requiring as large of a roller diameter as possible.
Needle roller cam followers have a heavy outer ring cross-section and a
full complement of needle rollers. They offer high dynamic and static load
carrying capability, and anti-friction performance, in a compact design.
They are used as track rollers, cam followers, and in a wide range of
linear motion systems.
INA Cam Followers
Cam followers come in a variety of design options including
relubrication with built-in grease fitting or seals, mounting options such
as an integral threaded stud, crowned outer rings to handle misalignment,
additional stud strength for high shock loading and corrosion resistance
for food and pharmaceutical industry applications.
Yoke type cam followers are intended primarily for applications where
loading conditions exceed the capabilities of stud type cam followers, or
where clevis mounting is desired. Clevis mounting provides support on both
sides of the cam follower and permits use of a high strength pin. Yoke
type cam followers are available with and without seals, and with crowned
outer rings.
INA Cam Followers
Crowned outer rings are used to minimize outer ring thrusting in
applications where the axis of the cam follower is not parallel to the
surface of the track or is skewed relative to the direction of travel.
Crowned outer rings are a good selection for use with curved or circular
tracks. In well-aligned applications, crowned outer rings can cause
accelerated track wear.
Caged roller followers provide large internal grease storage capacity for
applications where re-lubrication is infrequent. Cage guided rollers and a
very heavy outer ring cross-section permit operation at high loads and
high speeds. Caged roller followers are available with and without seals.
The unsealed design provides the additional advantages of very low
friction to prevent skidding in lightly loaded applications and
flow-through lubrication. Caged roller followers normally mount directly
on a hardened and ground pin.
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