A Study of Power Transmission Efficiency in Belt Transmission and Carrying System

作为带传动、运输系统动力传动机械效率的基础性研究，本文研究了用于带传动、运输系统的平带传动特性和齿形带的传动特性及摩擦损失。首先，用有限元方法分析了橡胶平带和薄膜带传动的张力分布，并通过实验讨论了皮带轮凸度对平带张力分布的影响。得出以下结论：(1)薄膜扁带的张力分布符合欧拉理论。(2)胶带的有效风角从欧拉的理论计算值中得到很大的反映。(3)芯体将胶带中的大部分张力传递给胶带。(4)横向张力很大程度上受平带上凸度的影响。其次，分析了基于带齿和带轮齿啮合干涉的摩擦功，并对齿带传动的动力传递机械效率进行了实验研究。得出以下结论：(1)齿形皮带的驱动力矩是齿形摩擦和皮带弯曲刚度共同作用的结果，且呈周期性波动。(2)齿形皮带的驱动力矩大于扁平诱饵。从有限元分析的结果来看，基于齿带啮合的摩擦功是相对于齿距的周期波动的。

As basic research on power transmission's mechanical efficiency of belt drive, transport system, this study examined flat belt used for belt drive, transport system and transmission characteristic of toothed belt and friction loss.To begin with, by the finite element method, tension distribution of rubber flat belt and film belt transmission was analyzed, and the effect of the pulley crowning on tension distribution of the flat belt was discussed experimentally. Following conclusions were obtained.(1) Tension distribution of the film flat belt agrees well with the theory of Euler.(2) Effective wind angle of the rubber flat belt greatly appears from the theoretical calculation value of Euler.(3) The core body transmits most of the tension which is caught in the belt the rubber flat belt.(4) The cross-direction tension greatly receives the effect of the crowning on the flat belt.Next, friction work based on the meshing interference of belt tooth and pulley tooth was analyzed, while the experimental research on power transmission's mechanical efficiency of the toothed belt gearing was carried out. Following conclusions were got.(1) The driving torque of toothed belt is the effect of the friction of tooth and belt bending rigidity, and it fluctuates periodically.(2) The driving torque of toothed belt is bigger than it of flat bait. In short, more large friction loss has produced the way of toothed belt.(3) The polygonal action of the pulley is reduced the toothed belt by the interference of the tooth.(4) From the result of the FEM analysis, the friction work based on the meshing of the toothed belt fluctuates as a period in respect of a belt pitch.