【作者】 曾又姣；

【导师】 张一同；

【作者基本信息】 燕山大学 ， 机械设计及理论， 2001， 硕士

【摘要】 本文作者通过详细地分析直动滚子从动件凸轮机构的两种受力状态，推导出了直动滚子从动件凸轮机构在推程阶段以及回程阶段的瞬时效率公式以及在推程阶段、回程阶段以及整个运动循环内的总效率公式。第一次给出了完善的效率公式，为正确进行效率计算和理论分析奠定了基础。研究了在给定的各种不同基本设计参数情况下所决定的凸轮的轴心许用区内，对于不同大小、不同的轴心位置的凸轮，直动滚子从动件凸轮机构的瞬时效率在推程阶段和回程阶段的变化规律以及总效率分别在推程阶段、回程阶段以及整个运动循环周期内的变化规律。探讨了凸轮机构的效率和一些设计参数之间的关系，特别是凸轮机构的效率和压力角之间的关系，给出了效率的真实变化规律。这对于澄清效率和压力角在理论上的争议，有着十分重要的理论参考价值。 同时，作者编写了追求效率最高的单目标优化程序以及既追求效率高、又追求加工性能好的双目标优化设计的通用程序。双目标优化设计程序同时还具有对所设计出的凸轮机构的运动过程进行仿真模拟显示的功能。通过比较余弦加速度和正弦加速度这两种从动件运动规律的优化结果，得出了一些具有参考价值的结论。这是一个全新的双目标优化设计。该程序通用性强，并可扩充为多种从动件运动规律的凸轮的优化设计，在凸轮的设计和加工方面有着很大的实用价值。 以上所推导的公式、结论以及程序同样适用于尖底直动从动件凸轮机构。以上研究工作丰富了凸轮机构的理论，有着十分重要的理论和实用价值。更多还原

【Abstract】 In this paper, the author has inferred the instantaneous efficiency equation during rise and return and the general efficiency equation during rise, return and the whole motion cycle respectively by analyzing two kinds of force states of in-line roller follower cam mechanisms in detail. The complete efficiency equations are presented for the first time, so foundation is settled for correct efficiency calculation and theory analysis. In the axes permitted area determined by different given basic design parameters, for different size and different axes position ,the instantaneous efficiency variation rule during rise and return and the whole efficiency variation nile during rise, return and the motion cycle of in-line follower cam mechanisms has been studied respectively. The relationship between cam mechanisms?efficiency and some design parameters, especially the relationship between efficiency and pressure angle of cam mechanisms, has been discussed and the real variation rule of efficiency has been given. These mentioned above have very important theory抯 reference value for clarifying dispute about the theory of the relationship between efficiency and pressure angle.At the same time, the author has written the single-target optimization design抯 program that is used to design cams which have the highest efficiency and the double-target optimization design抯 program which is used to design cams which have higher efficiency and better machine characteristic. There is the function of the double-target optimization design抯 program displaying the designed cam mechanism抯 simulated whole motion procedure as well. By comparing optimum cams of simple harmonic follower-motion basic curve with optimum cams of cycloidal follower-motion basic curve, some conclusion of reference values are drawn. It is a completely new double-target optimization design. There is good general use of this program .The program can be enlarged so that it can be used to design cams for many kinds of follower-motion basic curve. There is great practical value of it for cam design and cam machining.All these equations, conclusion and programs can also be applied to in-line knife-edge follower cam mechanisms. The above-mentioned study has enlarged the theory of cam mechanisms and has very important theory抯 value and practical value.更多还原