Cylindrical roller-incorporated roller chain

A cylindrical roller-incorporated roller chain comprising a bushing whose both end portions are connected to bushing holes in a pair of inner plates, a special hollow roller having no collar on an inner circumferential surface disposed between said pair of inner plates, a series of cylindrical rollers incorporated between said bushing and said special hollow roller, and a pair of side plates respectively disposed on both axial end portions of said special hollow roller, characterized in that

• said series of cylindrical rollers are composed either of a steel cylindrical roller or of an oil-impregnated sintered alloy cylindrical roller, said steel cylindrical roller and said oil-impregnated sintered alloy cylindrical roller being alternately disposed in a circumferential direction,
• said pair of side plates are each composed of an oil-impregnated sintered alloy having a collar portion and a cylindrical portion, an axial end surface of said each collar portion abutting on an end surface of said special hollow roller, said each cylindrical portion being fitted between the inner circumferential surface of said hollow roller and the outer circumferential surface of said bushing, the fit between the outer circumferential surface of said each cylindrical portion and the inner circumferential surface of said hollow roller being a close fit and the fit between an inner circumferential surface of said each cylindrical portion and an outer circumferential surface of said bushing being a loose fit.