抄録
The rubber belt for CVT in scooter is subjected to the complex loadings, because the CVT performs as a variable speed device and as a 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 failureanodes 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 surface-crack initiation type. The damage for the surface-crack initiation was accumulated by the shearing between the belt cord and the belt side-surface, where the torque was transformed by the friction between the belt and pulley. The extent of the shearing stress was estimated by a simplified mechanical model, which was proposed basing on the Euler's theory.
