Abstract: A roller chain incorporates a plurality of rolling members between a roller and a bushing. A thrust bearing plate is provided between the end surfaces of the roller and inside surfaces of inner link plates. The outer diameter of the roller is smaller than the widths of the inner link plates and the outer link plates and the roller is accomodated in a projected area of the widths of the inner link plates and the outer link plates.

Abstract: A roller chain incorporating the roller bearings wherein a plurality of rollers are disposed between a roller that functions as an outer ring and a bush that functions as an inner ring comprises a substantially ring-shaped retainer disposed on both ends of the roller respectively. The retainer includes a plurality of pockets for guiding at least a part of each of the rollers on the inner side of the retainer.

Abstract: A roller chain incorporates a plurality of roller members between a roller and a bushing. A thrust bearing plate is provided between the end surfaces of the roller and inside surfaces of inner link plates. The outer diameter of the roller is smaller than the widths of the inner link plates and the outer link plates and the roller is accommodated in a projected area of the widths of the inner link plates and the outer link plates.

Abstract: A roller chain incorporating the roller bearings wherein a plurality of rollers are disposed between a roller that functions as an outer ring and a bush that functions as an inner ring comprises a substantially ring-shaped retainer disposed on both ends of the roller respectively. The retainer includes a plurality of pockets for guiding at least a part of each of the rollers on the inner side of the retainer.

Abstract: A sealed chain includes an elastic seal member fitted around the circumferential surface of a pin and disposed between the inner side surface of an outer link plate and the end face of a bushing. The end face of the bushing is retracted from the outer side surface of an inner link plate so that an annular recess or space is formed between the end face of the bushing, the outer circumferential surface of the pin and the peripheral wall of a bushing hole in the inner link plate. The seal member is partly received in the annular space. The width of the sealed chain is equal to that of a standard chain even when a relatively thick seal member such as an O-ring is used.