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The roller chain runs on rotating sprockets connected to the motor that drives the chain. In most roller chains, there are two types of back links employed alternately to make it operate. Internal join (also called roller join): The two interior plates are joined together by two sleeves or bushings underneath the two rollers. Outer ring (also referred to as pin ring): The two outer plates are pinned together, via the bushing of the interior ring.
Silent chain, also acknowledged as inverted tooth chain. It is created to eradicate the sick results of stretching and develop a quiet walk. As the chain is stretched and the pitch of the chain will increase, the radius that the chainrings journey above the sprocket teeth increases slightly.

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