Abstract
The rubber belt for CVT in scooter is subjected to the complex loadings, because the CVT performs as the variable speed device and as the power transmission. Therefore, the failure mechanism of the CVT rubber belt is considerably complex, and therefore the failure mechanism has not sufficiently been understood. There are three major failure modes for the CVT rubber belts, namely tension rubber crack, bottom land crack and adhesive rubber crack. Moreover, the adhesive rubber crack was classified into the surface crack and the de-bonding of the interface. In this study, the authors focused on the initiation of the surface crack for the adhesive rubber. Namely, the initiation mechanism of the surface crack was discussed using FEA, and proposed the equation for the surface crack initiation based on the Euler's equation.
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