| 摘要 |
In a power transmission chain, an increase in rigidity in connection between pins and pulleys, a reduction in looseness of the pins when the pins bite into the pulleys, a reduction in driving noise and a further increase in practical durability are attained. A chain 1 which is wound round on a pair of pulleys so as to extend therebetween includes a plurality of links 2 and a plurality of connecting members 50. A first pin 3 and a second pin 4 of the connecting member 50 are brought into rolling and sliding contact with each other at a contact portion T which is displaced in association with a change in a flexing angle between the links 2. End faces 17 of the first pin 3 each have a projecting curved portion 20 where a contact area 21 is formed when the end faces 17 are brought into contact with sheave surfaces of the pulleys. With respect to a vertical direction, a projecting center M of the projecting curved portion 20 is disposed between a position S1 of a first contact portion T1 when the chain 1 bites into the drive pulley and a position S2 of a second contact portion T2 when the chain 1 bites into the driven pulley.
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