Patent ID: 8708851

Claim:
A power transmission chain comprising: a plurality of links which are aligned in a chain advancing direction and a plurality of connecting members which extend in a chain widthwise direction which is at right angles to the chain advancing direction so as to connect the links together, wherein the connecting member includes first and second power transmission members which have facing portions which face each other, the facing portions rollingly and slidably contact each other at a contact portion A which is displaced in association with a change in a turning angle between the links, a flat portion is provided on a back surface of the first power transmission member which lies opposite to the facing portion, the flat portion is inclined along an inclination direction which is inclined relative to the chain advancing direction when a chain straight-line area is seen from the chain widthwise direction, a point of intersection P 0 is formed by an imaginary line L 1 which passes through a central position of an overall height of the first power transmission member along the inclination direction and which intersects the inclination direction at right angles intersecting the flat portion when the chain straight-line area is seen from the chain widthwise direction, a point of intersection P 2 is formed by an imaginary line L 2 which passes through the contact portion A and extends in the chain advancing direction intersecting the flat portion between the point of intersection P 0 and one end P 1 of the flat portion when the chain straight-line area is seen from the chain widthwise direction, and the following expression is satisfied when a distance between the point of intersection P 0 and the point of intersection P 2 is referred to as h 1 and a distance between the point of intersection P 2 and the one end P 1 of the flat portion is referred to as h 2 with respect to the inclination direction: 0.1 ·h 1≦ h 2, and wherein the first power transmission member includes the curved corner portion and a curved connecting portion which connects the flat portion and the corner portion together, the connecting portion has a portion which connects to the flat portion and a portion which connects to the corner portion, and the radius curvature R 1 of the corner portion, a radius R 2 of curvature of the portion which connects to the corner portion and a radius R 3 of curvature of the portion which connects to the flat portion satisfy the following expression: R 2 <R 1 <R 3.