| 摘要 |
A power transmission V-belt having a tensile member (11) arranged in the form of a layer along the center line of the belt and first and second elastic rubber layers (14), (13), formed on opposite surfaces of the layer. The modulus of elasticity of the second elastic rubber layer is either equal to or smaller than that of the first elastic rubber layer. A first stretchable fabric (16) is provided on the surface of the first elastic rubber layer (14) and a second stretchable fabric (15) is provided on the surface of the second elastic rubber layer (13). The stretchability of the second stretchable fabric in the longitudinal direction is larger than that of the first stretchable fabric (16). The belt has a trapezoid cross-section. The method of manufacture comprises the steps of laying a second stretchable fabric (15) on a cylindrical drum (19) laying a first elastic rubber sheet (20) small in tension elasticity modulus on the stretchable fabric (15); spirally winding a rope-shaped tensile member (11) on the elastic rubber sheet to form a tensile member layer; laying a elastic rubber sheet (21) larger in tension elasticity modulus than the first elastic rubber sheet (20) on the tensile member layer; laying a first stretchable fabric (16) lower in stretchability than the second stretchable fabric (15) on the second elastic rubber sheet (21), to form an assembly. The assembly is subjected to vulcanization to obtain a sleeve-shaped molded belt blank, and then cut into rings to form alternately indirect molded V-belts which are turned inside out before use and direct molded V-belts which can be used without turning inside out.
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