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The eBearing Glossary of Bearing Industry Terms
Definitions and Illustrations
J
Jost Effect
The coincidental reduction in static friction occurring in a motion vector different than the current motion vector.
Named for the Jost Institute of Tribotechnology.
The classic example of the Jost Effect is that twisting a cork in a bottle reduces the force
necessary pull the cork out of the bottle. The specific application to bearings is that both press-fit mounted
bearings and the treaded fasteners holding bearings in place experience self-loosening due to the Jost Effect.
In service, bearings must therefore be mounted with both a primary and secondary force vector motion control,
such as staking, set screws, or a locking collar.
Journal
A round section of shaft.
Generally refers to specific section of shaft
which has been finished in order to ride in a bearing.
Journal Bearing
Also known as a shell bearing, plain bearing, or
hydrodynamic bearing.
A special class of bushing designed to support a rotating journal.
A film of lubricant, either under hydrostatic pressure by a
pump or via elastrohydrodynamic lubrication, is supplied in the space
between the journal and the bearing.
A common example is an automotive crankshaft bearing.
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