| abstract |
A toothed belt (1) is provided which has excellent environmental resistance such as heat resistance and cold resistance, high load resistance and high rigidity and achieves high accuracy, light weight, compactness and low noise. A toothed belt (1) is provided with a belt body (4) comprising a plurality of tension cords (2) juxtaposed in the widthwise direction of a rubber part (3), a plurality of toothed rubber parts (5) on a surface of the belt body (4) are formed and a tooth tissue part (6) covers the surface of the toothed rubber parts (5). The rubber part (3) contains dioctyl sebacate and trimellitic acid ester in a mass ratio of 1:19 to 1: 1, the mass percentage of the dioctyl sebacate to the whole amount of the rubber part (3) is less than 4 mass%, and the mass percentage of the total amount of the dioctyl sebacate and of the trimellitic acid ester in the entire amount of the rubber part (3) is in a range of 4% by mass to 8% by mass. |