Re: Solid, Roller & Friction Bearing Journals

Doug Brown <brown194@...>

Non-roller bearings were labor intensive with the checking and adding of
lubrication. With higher labor rates and lower parts cost, the
break-even point favored roller bearings. Roller bearings also helped
eliminate hotbox failures.

Doug Brown

-----Original Message-----
From: [] On Behalf Of
Sent: Friday, August 26, 2005 8:44 AM
Subject: [STMFC] Re: Solid, Roller & Friction Bearing Journals

Tony Thompson wrote;

Looking into roller bearing history, Timken was selling roller
bearings for horse-drawn equipment in 1893. Their bearings were
incorporated into automobiles quite early, and into machine tools
before World War I. (Timken began to call their product an
"anti-friction" bearing around 1910.) It is an indication of the
conservatism of railroad mechanical people that railroad
applications came as late as they did.


In the 1903 book, "Railroad Construction-Theory & Practice", which I
afore referred to, concerning at that time the application of roller-
journals to freight cars;

" But the advantages (of roller-journals) disappear as the velocity
increases. The advantages also decrease as the load is increased, so
that with heavily loaded cars the gain is small. The excess of cost
for construction and maintenance has been found to be more than the
gain from power saved."

Their thoughts in 1903 were apparently more along the lines of
better lubrication of "solid-bearings";

" The resistance could probably be materially lowered (in 'ordinary -
journals') if some practicable form of journal-box could be devised
which would give a more perfect lubrication."

Something happened in later years for the ultimate conversion to
roller-journals, probably a significant reduction in costs in
applying them to 100's of thousands of freight-cars?? (It's ALWAYS
about the "money".)

Paul Hillman

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