Patent ID: 8636611

Claim:
A power transmission chain configured so as to extend between pulleys to thereby transmit power by a frictional force, the power transmission chain comprising: a plurality of links each comprising front and rear insertion through holes through which pins are inserted; and a plurality of first pins and a plurality of second pins which are arranged in a line for connecting together the links which are arranged in a chain width direction such that the front insertion through hole of one link is associated with the rear insertion through hole of another link, a longitudinal bending of the links being enabled through relative rolling contact movement of the first pins and the second pins, wherein the links comprise links of small pitch length and links of large pitch length, and opposite end faces of at least either of the first pins and the second pins are brought into contact with sheave surfaces of the pulleys when the power transmission chain is placed so as to extend between the pulleys to thereby transfer power by the frictional force, wherein a pin held by one of the pulleys is referred to as a node, and wherein the links of large pitch length are arranged in the power transmission chain such that when a pulley of the pulleys is operating at a minimum radius thereof, a number of nodes of the links of large pitch length clamped by said pulley is in a range of one node to one-half of a total number of nodes clamped by said pulley along an entire length of the power transmission chain.