| 摘要 |
PROBLEM TO BE SOLVED: To properly restrain progress of a crack generated on an interface between a belt cord and covering rubber by setting an elastic modulus of wires of a revolving belt layer and a modulus of elasticity of volume of rubber to cover the arranged wires not less than a prescribed value, and forming the arranged wires in a waveform in an area less than a prescribed quantity of a belt width in a side end part of the revolving belt layer. SOLUTION: An elastic modulus of wires 10 of a revolving belt layer 7 is set not less than 2000kgf/m<3> , and a modulus of elasticity of volume of rubber to cover the arranged wires 10 is set to 200kgf/mm<2> , and the arranged wires 10 are formed in a waveform in an area SW less than 10% of a belt width in a side end part of the revolving belt layer 7. Then, a crack progressing along the wires by being generated on an interface between the wires and its covering rubber in the side end part of the revolving belt layer 7, is checked by tread rubber. When the wires 10 are formed in a waveform, the wires can be easily moved, and since there is the possibility of cutting the wires, a modulus of elasticity of volume of covering rubber is set to 200kgf/mm<2> , and a movement of the wires is restrained. |
