Patent ID: 7874952
Filing Date: 2011-01-25
Classification: F16G

Abstract:
1. A power transmission chain, comprising: a plurality of links aligned in a chain travel direction; and a plurality of coupling members that couple the plurality of links one to another, the coupling members each including a first power transmission member and a second power transmission member, the first power transmission member including an opposing portion that opposes the corresponding second power transmission member, the opposing portion coming into contact with the corresponding second power transmission member on a contact portion undergoing displacement in association with a change of a bending angle between corresponding links in a contact state including at least one of rolling contact and sliding contact, wherein when viewed in a chain width direction orthogonal to the chain travel direction, the opposing portion includes an arc-shaped portion having a predetermined radius of curvature and a rate-of-change increasing portion in which a rate of change in amount of displacement of the contact portion increases with an increase of the bending angle, the arc-shaped portion includes a portion that forms the contact portion when the bending angle is equal to or greater than zero and equal to or smaller than a predetermined boundary angle during displacement in a first rotational direction, the rate-of-change increasing portion forms the contact portion when the bending angle is greater than the predetermined boundary angle during displacement in a second rotational direction opposite to the first rotational direction, the power transmission chain is wound over a pulley while producing at least the bending angle, and the boundary angle is smaller than the bending angle.