Load Carrying Capacity Of A Bearing
|The example shows a shaft mounted fan
driven by a belt and powered by a motor.
Radial loads originate
A. Weight of the shaft
B. Weight of the pulley
C. Tension of the belt
D. Weight of the propeller
E. Propeller rotation
Axial loads originate from the wind (E) induced by the propeller
rotation. Combination loads are the result of both radial load (s) and
axial load (s) being combined and exerted on a single bearing.
To ensure a define load carrying capacity of ball and roller bearings
for a given application, it is essential to have a clear idea about the
running speed, the size and direction of the loads and the designed
expectation of life.
The magnitude of load is always influenced by the running speed. For
every bearing number its maximum load carrying capacity is specified,
corresponding to various running speeds. This load carrying capacity is
considered to be valid only for the bearing having normal dimensional
and running accuracy, proper methods of lubrication and a speed which
yields a life expectance of approximately 5000 running hours.
The Load Zone and Contact Points
When a bearing is supporting a radial load, the load is distributed through only
a portion of the bearing—approximately one-third (1/3)—at any given time. This
area supporting the load is called the bearing load zone.
Radial ball bearings are probably the most widely used and most recognized ball
bearing. These bearings have one row of balls (referred to as a
single row), that revolves around the ball path. This feature provides
another name for the bearings; they are commonly called deep groove ball
bearings. Although designed to primarily carry radial loads, a radial ball
bearing’s raceways are deep enough that it can also carry reasonable thrust
loads. (However, if thrust loads are excessive, an alternative type of bearing
should be considered.)
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