Re: Friction Bearings – How Old Is This Term?
I came late to this thread, but the first time ‘friction bearing’ was used related to truck journals was in the March 1956 Model Railroader. ‘Solid bearings’ was first mentioned relative to truck journals in the October 1941 issue of Model Railroader.
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> On Behalf Of Clarence Zink
Sent: Tuesday, July 6, 2021 6:21 PM
Subject: Re: [RealSTMFC] Friction Bearings – How Old Is This Term?
As a model railroader professionally employed in the oil & gas, water well, geotechnical, and mineral drilling businesses since 1972, the "friction bearing" has been
used in the drill bit field for several decades, and is understood to be a lubricated,
sliding contact type bearing. In the drilling business, the term "friction bearing" is interchangeable with "journal bearing", and represent certain characteristics for durability. A friction/journal
bearing may consist of an internal stationary spindle in direct contact with the external "rolling cone" (which breaks the rock), or it may have a 'bushing' between the rolling cone and spindle. In any case, metal slides against metal. It must be lubricated,
or the friction will quickly destroy the bearing. In the drilling business, these types of drill bits are always "sealed", to prevent contamination by drill cuttings, and premature destruction of the bearings.