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An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.
Spherical roller bearing with a brass cage in a cut-through view. A spherical roller bearing is a rolling-element bearing that permits rotation with low friction, and permits angular misalignment. Typically these bearings support a rotating shaft in the bore of the inner ring that may be misaligned in respect to the outer ring.
No. 1309 was based on a 40-year-old design, with mechanical lubricators, stoker, and superheater, the last of a series of 2-6-6-2s that the Chesapeake and Ohio Railway (C&O) began in 1911. A very similar design, the USRA 2-6-6-2 , was chosen by the United States Railroad Administration as one of its standard designs thirty years earlier during ...
A bearing can last indefinitely—longer than the rest of the machine—if it is kept cool, clean, lubricated, is run within the rated load, and if the bearing materials are sufficiently free of microscopic defects. Cooling, lubrication, and sealing are thus important parts of the bearing design.
The principal parts of a MORGOIL bearing are relatively uncomplicated. The sleeve is an alloy steel forging, heat-treated and ground to a fine finish. The sleeve has a precision non-locking tapered bore, which fits on, and is keyed to, the tapered roll neck, thus becoming the bearing journal.
Thrust ball bearings, composed of bearing balls supported in a ring, can be used in low-thrust applications where there is little axial load. Cylindrical roller thrust bearings consist of small cylindrical rollers arranged flat with their axes pointing to the axis of the bearing. They give very good carrying capacity and are cheap, but tend to ...
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