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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.
A drill bushing, also known as a jig bushing, [1] is a tool used in metalworking jigs to guide cutting tools, most commonly drill bits. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. They are designed to guide, position, and support the cutting tool. [2]
Like the O-ring chain it has sealing rings which keep the contaminant (dirt) out, and lubricant in between the pins and bushings. This is known as internal lubrication. However, unlike O-ring chain, it has X-shaped seal which does not experience increased surface area (which is in contact with the chain plates) when under pressure.
In this assembly, the outside plate with the two pins protruding from it are spaced at the same pitch as the chain at 12.7 mm (0.50 in), and the free ends of the pins are grooved. The other plate fits over the ends of the pins and is secured with a spring clip to make the connection, and this type of master link comes closest to being re-usable.
A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole.
As with standard roller chains, self-lubricating roller chains consist of five basic parts: inner plates, outer plates, pins, bushes, and rollers. However, the bushes for self-lubricating chains are sintered metal, produced using powder metallurgy. Self-lubricating chains can be manufactured cheaply, quickly, and to precision tolerances. [8]
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