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,printingpresses,cars,motorcycles, and bicycles. It consists of a series of short cylindrical rollers held together by side links. It is driven by a toothed wheel called a sprocket.
Roller chain滚子链; 滚链
bush roller chain套筒滚子链
type类型; 铅字; 文字; 于…类型的; 打字; 按类型把…归类; 成为…的典型; 浇铸
chain drive利用链条传送动力的装备
https://en.m.wikipedia.org/wiki/Roller_chain
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