| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oil-free chain with its weight reduced and chain-driving power suppressed that prevents the entry of foreign matters outside the chain completely, holds lubricating oil between a bush and a connecting pin for a long time while preventing leakage thereof to the outside, and avoids mutual abrasion wearing liable to occur between an outer plate and an inner plate. <P>SOLUTION: The oil-free chain 100 has the end surface 121 of the bush 120 located at the same level as the outside surface of the inner plate 110. The oil-free chain 100 includes an inside annular projecting part 152 of the outer plate 150 that projects from the reference inside surface 151 of the outer plate 150 to be concentric with a pin hole and faces the end surface 121 of the bush 120, and with an outside annular recessed part 154 that dents from the reference outside surface 153 of the outer plate 150 to be concentric with the pin hole, and corresponds to the inside annular projecting part 152. <P>COPYRIGHT: (C)2012,JPO&INPIT |
