| 摘要 |
PROBLEM TO BE SOLVED: To make a transmission belt excellent in elasticity and fatigue even if it is used by a small pulley driving system as securing the required strength by the glass fiber composing a cord being of E glass, the occupied area by the glass fiber on the cord cross section being within a specific range and the pitch of the cord being specific times of the occupied area. SOLUTION: An E glass (non-alkali glass) excellent in tenacity is used for a glass fiber 21. The glass fiber 21 is converged, a plural number of glass fiber bundles are brought into lines, dipped in a VP-SBR system RFL (an adhesive processing fluid, which principal component is a mixture of an initial condensation product of a resorcinol formalin and a latex) fluid, pulled up and after given a heat treatment, a first twist thread 22 is made by given the first twist. A plural number of the first twist threads are collected, brought into lines and given a final twist. The glass fiber occupying area A on the cross section of a glass fiber cord 13 is set for 0.25 to 0.36mm<2> . The cord pitch in the interior of the belt is set for 1.9 to 2.3×A.
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