【作者】 胡丽萍；

【导师】 樊智敏；

【作者基本信息】 青岛科技大学 ， 机械设计及理论， 2007， 硕士

【摘要】 变速器通常分为有级变速器和无级变速器两大类，脉动式无级变速器以其传动可靠、寿命长、变速范围大、静止和运动时均可调速、调速性能稳定等优点成为现代机械传动技术的主要发展方向之一，其中又以Zero-Max型无级变速器的性能较为优良。但由于一些问题的存在制约了其承载能力的提高，限制了其应用范围的扩大。本文用解析法分析了Zero-Max型无级变速器的传动误差及间隙副的影响，建立了其实体模型，进行了运动学与动力学仿真，对其疲劳、磨损及超越离合器进行了研究，综合多种影响因素对其承载能力进行了分析研究。主要开展的研究工作如下：1．在分析Zero-Max型无级变速器传动特性的基础上，对其运动构件的传动误差进行分析，建立了输出角误差方程，为制造公差的确定提供了理论依据，并为后续效率计算奠定了理论基础。2．由于装配、制造误差以及磨损，运动副不可避免的存在间隙，高速运转时间隙的影响不容忽略。通过分析间隙对机构动态特性的影响，对间隙副副元素间的相对运动和多个间隙副之间的相互影响进行了研究，建立了含间隙曲柄摇杆机构的运动方程。3．对Zero-Max型无级变速器进行运动学与动力学仿真，得到其运动时的速度、加速度、功率消耗、转动副受力、摩擦力曲线等，并通过分析和比较多种参数方案，获得最优工作性能，为实际加工制造提供了依据。4．对Zero-Max型无级变速器系统进行了振动分析，得到了此系统的固有频率和振型，为后续动态特性的响应分析打下了基础。通过模态分析，发现无级变速器各构件的危险部位，无级变速器的失效多发生在这些部位附近。5．对影响机构疲劳强度的因素进行了分析，提出了提高其抗疲劳性能的措施。对该变速器的重要组成部分——超越离合器进行了分析，得到限制超越离合器承载能力提高的影响因素，分析了其失效原因，并提出了提高其寿命的措施。更多还原

【Abstract】 Impulse continuously variable transmission (CVT) has become one of the main directions of modern transmission technology. It can transmit reliably and regulate while resting and moving. Its life is long, shift range is large and shift capability is stable. Zero-Max CVT has better capability, but it still has some problem restricting its increase of bearing capacity. The researches of this paper are as follows:1. Transmission error of movement component is analyzed based on the analysis of transmission characteristic of Zero-Max CVT. Error expressions of output angle are deduced. It offers a theory basis of manufacture tolerance and builds the foundation for future efficiency calculation.2. The pair inevitably has clearance because of assembly manufacture error and wearing. The impact of clearance can’t be ignored when analyzing high speed machine. Relative movement between pair elements of clearance pair and mutual impact between several clearance pairs are researched. Movement equation of crank and rocker mechanism with clearance is deduced.3. Kinematics and dynamics simulation of Zero-Max CVT is carried out by using ADAMS. Curve of velocity, acceleration, power consumption, element force of rotation pair, friction etc. can be carried out. Excellent working performance can be obtained according to analyzing and comparing several parameter projects. It builds a foundation of practice manufacture.4. Vibration analysis of Zero-Max CVT system is carried out by using ANASYS. Natural frequency and vibration model of the system are obtained. It builds a foundation of future response analysis of dynamical characteristic. The most dangerous parts of CVT components can be found. Invalidation and fracture of CVT often occur near these parts.5. The impact factors of machine fatigue strength are analyzed and the methods of increase fatigue resistance character are advanced. Overrunning clutch witch is the important element of Zero-Max CVT is analyzed. Impact factors of restricting increase of bearing capacity of overrunning clutch are analyzed. Reasons of invalidation are analyzed and measures of increase life are advanced.更多还原