The synchronous belt drive with noncircular pulleys can be used to obtain accurate transmission with a specific motion law, but the shortage of big belt slack caused by noncircular pulleys limits its application. In order to reduce the belt slack, a novel synchronous belt drive with noncircular pulleys, which is formed by a driving circular pulley, a driven eccentric pulley and a noncircular tension pulley, was presented in this paper. During the transmission from the driving circular pulley to the driven eccentric pulley, the belt slack is compensated by the noncircular tension pulley. The calculation models for this novel synchronous belt drive were built based on tangent equations of the noncircular pulleys. The pitch curve of the noncircular tension pulley and the length of the synchronous belt were deduced by iterative algorithm. Subsequently, an auxiliary application program for the numerical calculation of these models, using MATLAB, was developed. The calculation examples by using this program prove that the proposed noncircular synchronous belt drive has far less belt slack than the traditional noncircular synchronous belt drive without tension pulley. At last, the results of the mathematical calculation were compared with the experimental data and good agreement has been reached.

中文翻译：

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一种新型非圆滑轮同步带传动的设计、建模与试验

非圆滑轮同步带传动可用于获得具有特定运动规律的精确传动，但非圆滑轮造成的皮带松弛度不足，限制了其应用。为了减少皮带松弛，本文提出了一种由主动圆轮、从动偏心轮和非圆张紧轮组成的非圆轮同步带传动。在从主动圆轮到从动偏心轮的传动过程中，皮带的松弛由非圆张紧轮补偿。这种新型同步带传动的计算模型是基于非圆滑轮的切线方程建立的。通过迭代算法推导出非圆形张紧轮节距曲线和同步带长度。随后，使用 MATLAB 开发了用于这些模型的数值计算的辅助应用程序。使用该程序的计算实例证明，所提出的非圆同步带传动比没有张紧轮的传统非圆同步带传动的皮带松弛要小得多。最后，将数学计算结果与实验数据进行了比较，达到了较好的一致性。