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.

A round section of shaft.

Generally refers to specific section of shaft which has been finished in order to ride in a 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.