金属平ベルトによる摩擦伝動時の張力分布とスリップ率の変化

Abstract

The objective of this study is to investigate the changes of tension distributions and slip ratios of metal flat belt driven by frictional force. In this study, thin flat belt made of metal was driven between 2 shafts in lab scale. The power generated by the motor was transmitted from the drive pulley to the driven pulley through a belt and absorbed by an electromagnetic brake. Tension distributions of belt were obtained by strain gauges attached to the belt surface. Slip ratio was also obtained by measuring the difference of rotational speeds of the drive and driven pulleys. The results showed that tension distributions during winding on the pulley were explained by Euler model. In contrast, the slip ratios were not well expressed by Euler model. Experimental data of the slip ratio were about three times larger than those predicted by Euler model. In other words, as opposed to the assumptions of the Euler model, entire area of wound metal belt was contributed to transmit the power throughout slip. In this study, the Euler model was modified where the change of frictional coefficient was assumed to be depended on sliding velocity between belt and pulley. The predicted results by the modified model were almost agreed with the experimental results. The modified model was also effective in predicting slip ratios even if the surface properties of the pulleys were changed.