There are actually two types of links alternating in the bush roller chain. The initial type is inner links, having two inner plates held with each other by two sleeves or bushings where rotate two rollers. Internal links Auto Chain alternate with the next type, the outer links, consisting of two external plates held jointly by pins moving through the bushings of the inner links. The “bushingless” roller chain is comparable in procedure though not in construction; instead of individual bushings or sleeves keeping the inner plates with each other, the plate includes a tube stamped into it protruding from the hole which serves the same purpose. This has the advantage of removing one step in assembly of the chain.
The roller chain design reduces friction in comparison to simpler designs, leading to higher efficiency and less wear. The initial power transmission chain varieties lacked rollers and bushings, with both inner and external plates held by pins which directly contacted the sprocket teeth; however this configuration exhibited extremely rapid use of both sprocket teeth, and the plates where they pivoted on the pins. This issue was partially solved by the development of bushed chains, with the pins holding the outer plates moving through bushings or sleeves connecting the inner plates. This distributed the put on over a larger area; however the teeth of the sprockets still wore quicker than is appealing, from the sliding friction against the bushings. The addition of rollers surrounding the bushing sleeves of the chain and offered rolling contact with one’s teeth of the sprockets resulting in excellent resistance to use of both sprockets and chain as well. There is even suprisingly low friction, provided that the chain is definitely sufficiently lubricated. Constant, clean, lubrication of roller chains is of primary importance for efficient operation and also correct tensioning