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.