Roller
bearings is a rolling elements which carry rolling load uses balls which hold
by the separation of two bearing rings
called races. The motion of the races causes the rolling elements to roll and
slide. Support
the rotating shaft of the inner ring that may be misaligned with respect to the
outer ring.
There
is many types of roller bearing are made as per the applications.
CYLINDRICAL ROLLER BEARING
In
a cylindrical roller have the greater length than diameter. Roller bearings can
bares the higher load capacity than the ball bearings, but the lower capacity
and higher friction under loads perpendicular to the primarily supported
direction.
SPHERICAL ROLLER
BEARING
Spherical
roller bearings have an outer ring with an internal spherical shape. The
rollers are thicker in the middle and thinner at the ends. Spherical roller
bearings can thus accommodate both static and dynamic misalignment.
GEAR BEARINGS
The
gear bearing is roller bearing combining to epicyclical gear. Each element of
it is represented by a concentric alternation of rollers and gearwheels with
equality of roller(s) diameter(s) to gearwheel(s) pitch diameter(s). The widths
of conjugated rollers and gearwheels in pairs are the same. The engagement is
herringbone or with the skew end faces to realize efficient rolling axial
contact.
TAPERED BEARINGS
In
this type of bearings, one side of the inner race is smaller while the one side
of the outer race is larger which allows more balls to assembled then the other
usual bearings which result in bear extra load capacity.it supports both the
axil and radial loads
NEEDLE ROLLER
In
these types of roller bearings use very long and thin cylinders. And the end of
the roller taper to points, which keeps the roller captive, or it can
hemispherical held by the shaft. The outside diameter of the bearing is
slightly larger than the hole in the middle.
The
performance of modern plant and machinery depends on largely depend upon the reliability of rolling bearings.
Proper lubrication is one of the major factors of reliability on the bearings.
Bearings operate on very thin films of lubricant, which have to be maintained
for the long lifespan of the elements life is achieved.
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| Roller Bearings |
Reduces
friction and wear by providing a flexible hydrodynamic film of sufficient
strength and thickness to support the load and separate the balls from the
raceways, preventing metal-to-metal contact. Minimizes cage wears by reducing
sliding friction in land surfaces. Prevents oxidation, corrosion of the metals
through rolling elements. Acts as a barrier to contaminants. Serves as a heat
transfer agent.
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