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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.
In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. [1] Several notations exist to describe the wheel assemblies of a locomotive by type, position, and connections, with the adopted notations varying by country.
A sprocket, [1] sprocket-wheel [2] or chainwheel is a profiled wheel with teeth that mesh with a chain, rack or other perforated or indented material. [ 3 ] [ 4 ] The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain passing over it.
The wheel arrangement of small diesel and petrol locomotives can be classified using the same notation as steam locomotives, e.g. 0-4-0, 0-6-0, 0-8-0. Where the axles are coupled by chains or shafts (rather than side rods) or are individually driven, the terms 4w (4- wheeled ), 6w (6-wheeled) or 8w (8-wheeled) are generally used.
It consists of one or more sprockets, also called chainrings [1] [2] [3] or chainwheels [3] attached to the cranks, arms, [4] or crankarms [5] to which the pedals attach. It is connected to the rider by the pedals , to the bicycle frame by the bottom bracket , and to the rear sprocket, cassette or freewheel via the chain.
Chain conveyors use an endless chain both to transmit power and to propel material through a trough, either pushed directly by the chain or by attachments to the chain. The chain runs over sprockets at either end of the trough. Chain conveyors are used to move material up to 90 metres (300 ft), and typically under 30 metres (98 ft). [1]: 271
The more common classical type is a solid chain track made of steel plates (with or without rubber pads), also called caterpillar tread or tank tread, [1] which is preferred for robust and heavy construction vehicles and military vehicles.
Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.