| 摘要 |
PROBLEM TO BE SOLVED: To provide a cogged V-belt capable of improving durability and excellent in transmission efficiency, in applications for transmitting a high load even in a small rate of a reinforcing agent.SOLUTION: A transmission belt comprises: an adhesive rubber layer 1 that contacts at least part of a core wire 2 extending in a longitudinal direction of the belt; an extensible rubber layer 4 formed on one surface of the adhesive rubber layer 1; and a compressed rubber layer 3 having a plurality of cogged parts 6 formed on the other surface of the adhesive rubber layer 1 and provided on the belt inner peripheral surface at predetermined intervals along the belt length, and frictionally engaging with a pulley in its sides. In the transmission belt, any of the adhesive rubber layer, the extensible rubber layer, and the compressed rubber layer is formed of a vulcanized rubber composition containing a hydrogenated nitrile rubber and a co-crosslinking agent. In any layer of the extensible rubber layer and the compressed rubber layer, the rubber hardness (durometer, type D) is set within a range of 50-70° and the rubber hardness of the adhesive rubber layer is set within a range of 30-60°. Further, in the extensible rubber layer and the compressed rubber layer, 15 pts. mass or less of a reinforcing agent is included with the total content of the hydrogenated nitrile rubber and the co-crosslinking agent as 100 pts. mass. |
