传统的非圆同步带传动只有两个非圆带轮，无法同时满足非匀速传动比和实时张紧要求，不能实现多个大中心距的不同非匀速直接精确传动。因此，本项目提出一种变松弛量自补偿的非圆多轮同步带传动：多个非圆从动轮满足多个不同非匀速传动要求，带的变松弛量由非圆张紧轮来实时补偿，实现实时张紧。.研究内容包括：变松弛量自补偿的非圆多轮同步带传动非圆从动轮和非圆张紧轮节曲线设计方法；基于共轭啮合原理的非圆同步带轮齿廓计算方法；变松弛量自补偿的非圆多轮同步带传动试验；非圆同步带传动“类多边形效应”理论计算及修正方法；非圆三轮同步带传动在栽植机构上的应用。.本项目将提出一种变松弛量自补偿的非圆多轮同步带传动及其设计方法，为实现多个大中心距的不同非匀速直接精确传动提供新传动机构和新方法，在机构学领域具有普遍意义；并将该传动应用于双曲柄五杆式旱地钵苗移栽机上，研制出性能优越的新型栽植机构，为提升我国移栽机水平提供技术支持。

For traditional synchronous belt drive based on non-circular belt pulleys, there are only two non-circular belt pulleys, so it can’t meet the requirements of non-uniform velocity ratio and real-time belt tension at the same time, and can’t realize the non-uniform and accurate transmission directly with multiple large center distance. Aiming at this problem, this project proposed a new kind of synchronous belt drive based on multi-non-circular belt pulleys with varying slack self-compensation, which can meet the requirements of multiple and different non-uniform transmissions by multiple non-circular driven belt pulleys, in which slack variations of synchronous belt during work are compensated by non-circular tension pulleys, realizing real-time tension..The research contents of this project include design method of centrodes of non-circular driven pulleys and non-circular tension pulleys in synchronous belt drive based on multi-non-circular belt pulleys with varying slack self-compensation, calculation method of tooth profiles of non-circular belt pulleys based on application of conjugate engagement theory, theoretical calculation and correction method of “similar polygon effect” of synchronous belt drive based non-circular belt pulleys and experiment of synchronous belt drive based on multi-non-circular belt pulleys with slack self-compensation, and application of synchronous belt drives based on three-non-circular belt pulleys on transplanting mechanism of dryland transplanting machine..This project will propose a new kind of synchronous belt drive based on multi-non-circular belt pulleys with varying slack self-compensation and design method of it, providing new drive mechanism and new method to realize different non-uniform transmissions with multiple large center distance, which has universal meaning in the area of mechanism. Furthermore this drive is applied on transplanting mechanism of dryland transplanting machine driven by five-bar mechanism with double cranks to develop a new transplanting mechanism with better working performance, providing technical support for promotion of transplanting machine in our country.