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Historically
speaking, fluid film bearings were the first type of rotary bearing
to appear simply because they are more simple than rolling-contact
bearings. Early sliding bearings were almost certainly first made
from wood after the invention of the wheel in prehistoric times, and
these were lubricated with grease derived from animal fat. Metal
wheel journal bearings followed. When the industrial revolution
began in the eighteenth century, machine rotational speeds reached a
point where lubricated metal journal bearings became
hydrodynamically isolated so that there was no metal-to-metal
contact. The initial discovery was certainly by accident, but soon
an empirical methodology was developed followed by the science of
tribojlogy related to journal bearings.
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know more about Journal Bearings, Click Here
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