| 摘要 |
PROBLEM TO BE SOLVED: To reduce abrasion of a connecting part of a driving chain. SOLUTION: In the driving chain A in which a pair of right and left links 1 are connected to links 2 adjacent to the links 1 through pins 5, at least one of connections of the links 1 is constituted by inserting the pin 5 into a hole (long hole) 1a opening in the links 1 with play, and an edge 9 contacting with the pin 5 of the hole (long hole) 1a has a round shape.
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