Roller chain with randomized pitch

摘要

A roller chain is provided with sets of links constructed of unequal pitch in order to alter the pattern of contacts between the chain and the sprocket and the resulting noise spectrum. The varying pitch lengths through the chain are achieved by varying the length of the inside links or the lengths of the outside links. Alternatively, the sizes and configurations of the rollers or bushings are varied. Configurations can include circular rollers, elliptical rollers or triangular rollers. The pattern of variation of the pitch of the links is randomized throughout the chain.