Re: Photo: Boiler On NYC Flatcar


Dennis Storzek
 

On Tue, Jul 21, 2020 at 05:09 PM, Matt Goodman wrote:
The radial lubrication streaking on the left most wheel face caught my eye. Probably from a leak through the rear seal while standing still.
 
Solid bearing journal boxes don't really have seals... the rear opening was closed by a "dust guard" which in the period of this photo would have been wood.. The oil level was maintained below the level of the axle. if the box was over filled, the excess quickly ran out the back. In operation, capillary action brought the oil up into the ball of wool yarn "waste" (short strands of yarn of no use for weaving) where it wetted the exposed bottom of the axle. When the axle turned the oil was drawn in between the axle journal and the journal bearing, and the car actually rode on a film of oil. This was a "total loss" lubrication system, as the oil spread across the journal it came out both the front and back edges of the bearing, which were shoulders that acted as thrust bearings to keep the truck aligned with the wheels. The oil that crept out the back was flung out and ended up on the face of the wheel, which is why there are no rusty wheels during the steam era.

Dennis Storzek

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