double roller chain

There are two types of links alternating in the bush roller chain. The first type is inner links, having two internal plates held with each other by two sleeves or bushings upon which rotate two rollers. Internal links alternate with the next type, the outer links, comprising two outer plates held together by pins moving through the bushings of the internal links. The “bushingless” roller chain is comparable in operation though not in construction; instead of separate bushings or sleeves holding the inner plates with each other, the plate includes a tube stamped into it Transmission Chain protruding from the hole which serves the same purpose. This has the advantage of removing one part of assembly of the chain.

The roller chain design reduces friction in comparison to simpler designs, resulting in higher efficiency and less wear. The initial power transmission chain types lacked rollers and bushings, with both inner and external plates kept by pins which directly contacted the sprocket tooth; however this configuration exhibited incredibly rapid use of both the sprocket teeth, and the plates where they pivoted on the pins. This issue was partially solved by the advancement of bushed chains, with the pins keeping the outer plates moving through bushings or sleeves connecting the inner plates. This distributed the use over a larger area; however the the teeth of the sprockets still wore quicker than is appealing, from the sliding friction against the bushings. The addition of rollers around the bushing sleeves of the chain and provided rolling contact with the teeth of the sprockets leading to excellent resistance to wear of both sprockets and chain as well. There is even very low friction, provided that the chain can be sufficiently lubricated. Constant, clean, lubrication of roller chains can be of primary importance for efficient operation and also correct tensioning.

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