机械毕业设计（论文）-微型轿车无级变速器设计——分体带轮式无级变速器.doc

摘 要 目前机械转动应用的带式无级变速器主要是带传动无级变速器。广泛应用于机械、石油汽车等行业。机械、石油行业多采用橡胶宽V带式，自动档汽车采用金属带式无级变速器。无级调速原理目前主要采用国外技术专利引进的挤压带传动式带传动无级变速技术，调速挤压力产生的主要问题：①橡胶V带磨损、热变形严重，寿命短，承载能力降低；②金属带成本高；③调速时主、从动轮传动带不在同一工作平面内；④传动带承载能力计算超出柔性体传动的欧拉公式范围；⑤带轮槽为曲线形状，加工成本高，尤其无法在家用电动轿车普遍应用等。 通过调研分析，采用分体带轮结构设计，开发新型带传动无级变速器，使其能满足家用微型轿车使用要求，调速时带轮分体在调速机构的作用下可以沿径向连续膨胀或收缩，达到改变带轮的工作直径，实现无级变速目的，消除了作用在V带侧面的挤压力带轮的问题。 毕业课题论文研究主要完成了以下工作: 1、 对分体带轮带传动无级变速器的工作原理以及各部分的主要功能分析，说明了新型V带无级变速器可以满足传动要求； 2、 结合设计参数的要求，完成了分体带轮带传动无级变速器主要零件(锥体轴和带轮分体等)的结构尺寸设计； 研究工作取得以下成果: 1、 创新提出分体带轮结构，通过调速控制机构可以改变主从动带轮的工作直径，实现连续无级变速； 2、 结构简单，成本低，适用性强〔可适应普通V带、平带、圆带、楔型带无级变速)； 3、 调速时消除了作用在传动带侧面的挤压力，减小由此产生的传动带的过大磨损等问题； 4、 总结出分体式V带传动无级变速器的有效圆周力计算方法。 关键词：带式传动；无级变速器；分体带轮 全套图纸，加 ABSTRACT The belt-type continuously variable transmission (CVT) has been widely used in the mechanics and the fields of petroleum and automobiles nowadays. To be exact, the rubber V-belt CVT is adopted for the mechanics and petroleum, while the metal CVT is used for automatic automobile. The working principle of CVT is mainly based on the technology of the pressed belt type CVT, which is of abroad technology patent. The main problem involves (1) the likely wear of rubber V belt the serious deformation from heat, the short service life and the reduced capacity of carrying.(2 )the high cost of metal belt.(3 )The main belts and auxiliary belts are not in the same working horizon when regulating speed. (4) The calculation on carrying capacity is beyond the format. (5) The pulley sleeve is in the form of curve, and the cost of production is too high. By careful analysis，The use of the structural design of split pulley，development of new CVT Belt Drive，To enable them to meet the requirements of domestic use of electric cars。It proves to reduce the wear of belt and avoid misalignment of pulleys to a large extent by adopting the parted pulleys and unique mood to vary speed. The study work has been completed as follows： 1. It proves that this new type of CVT can meet the driving requirement by ana