To maintain the lubricating oil between a bush and a linking pin without leaking out it externally for a long period of time while preventing the foreign substance invasion from the chain outside completely, and to provide the oil-free chain which raises the assembly accuracy of the chain in the width direction when assembling a chain.
The oil-free chain 100 is filled with the lubricating oil between the linking pin 122 and the bush 112, and covered with the resin layer 140 by insert molding except for the bush contact part 121b which the plate surface of the outside plate 121 face and contacts to the bush projection end part 112a of the bush 112 which is projected partly from the outer face of the inner plate 111 and the inner circumference part of the pin fitting hole to press fit the linking pin 122.
ISHIDA HIROKI
NAKAGAWA TAKASHI
IEMURA NORIHITO
Nobuo Fujimoto