Importance

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Abstract

A roller-chain bushing with a stress-relief opening centrally located along the seam of a rolled or roll-formed bushing has a tapered or relief segment at each bushing end to permit compressive fitting of the bushing ends into a link-plate hole thereby minimizing deformation of the bushing end, which tapered or relief segment is locally deformed or worked at a specific location prior to forming the bushing and the tapered segment is provided in a bushing region diametrically opposite the seam to reduce barreling of the bushing at mating of the bushing with the roller link-plate, and positioning of the tapered region along the chain pitch line at the point of stress concentration during chain assembly reduces the initial wear of the pin and bushing from initial chain loading.

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First Claim