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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.
A hot box is the term used when an axle bearing overheats on a piece of railway rolling stock. [1] The term is derived from the journal-bearing trucks used before the mid-20th century. The axle bearings were housed in a box that used oil-soaked rags or cotton (collectively called "packing") to reduce the friction of the axle against the truck ...
Journal (friction, radial or rotary) bearing: This is the most common type of plain bearing; it is simply a shaft rotating in a hole. [3] In locomotive and railroad car applications a journal bearing specifically referred to the plain bearing once used at the ends of the axles of railroad wheel sets, enclosed by journal boxes .
A journal box A Swiss axlebox A diagram of an American-style truck. To say that axlebox and journal box are synonyms is a bit inaccurate even if the function may originally been the same. The appearance is not the same, and unlike the journal box, which was rarely adapted to rolling-element bearings the axle box was readily
They register the radiation from every journal bearing that passes over them. If a bearing reaches the maximum temperature for safe travel, the detector will flag and count it as a defect. Because bearings can burn off in as little as three minutes, hotbox detector installations are extremely common on many railroads.
An equalising system links not only the driving-wheel axles but also the trailing and/or leading truck axle(s). [3]: 32 [5] [6]: 425 Leaf springs Main suspension springs for the locomotive. Each driving wheel supports its share of the locomotive's weight via leaf springs that connect the axle's journal box / axle box (40) to the frame.