新编机械式变速器齿轮传动.doc

南京航空航天大学 硕士学位论文 汽车机械式变速器变速传动机构可靠性优化设计 姓名：蒋春明 申请学位级别：硕士 专业：车辆工程 指导教师：阮米庆南京航空航天大学硕士学位论文 i 摘要 变速器是汽车传动系统的重要组成部分，它对汽车的动力性与经济性、操 纵的可靠性与轻便性、传动的平稳性与效率都有直接的影响。随着汽车工业的 高速发展和汽车现代设计方法的开发和应用，人们对汽车变速器设计的要求越 来越高。 本文将可靠性优化设计理论应用到汽车机械式变速器的设计中，根据汽车 动力性要求，在保证零件强度和刚度可靠使用的条件下，以变速器体积最小化 和传动齿轮重合度最大化为目标函数，建立了汽车机械式变速器多目标可靠性 优化设计的数学模型。并通过MATLAB 编程实现了对该模型的求解计算，最 终得到可靠性优化设计结果。通过可靠性优化设计方法与传统设计方法的对比， 得出可靠性优化设计在汽车机械式变速器设计领域是可行的，效果明显优越于 传统设计方法。然后，利用三维建模软件UG 建立了斜齿轮的三维模型。 本文第四章中还提出了利用 VB 与MATLAB 联合编写用于汽车机械式变 速器可靠性优化设计的应用程序，并通过基于ActiveX 技术的VB 与MATLAB 数据交换的方法将其实现。本文编写的应用程序使用方便，但局限于本文的研 究对象，还需要进一步研究改进才能推广运用。 最后，对全文工作进行了总结。 关键词：汽车机械式变速器，多目标优化，可靠性优化设计，MATLAB，VB 汽车机械式变速器变速传动机构可靠性优化设计 ii ABSTRACT Transmission is an important part of automobile powertrain. It has a direct effect on automobile’s quality of momentum and ecomomy, controlling quality of reliability and portability as well as driving quality of placidity and efficiency. With high development of automobile industry and the appearance of modern design method, the design of transmission is required more and more strictly. In this paper, reliability-based optimal design method is applied in the field of automobile transmission design. According to requirements for tractive performance of vehicle and the constraits of the strength and stiffness of the parts, a multi-objective reliability-based optimal mathematical model of auto-transmission is established on the basis of the smallest volume and the biggest transmission gear overlap of the auto-transmission. The mathematical model is solved by the programme of MATLAB. By comparing the result of reliability-based optimal design method with tradition’s, I get the conclusion that this method is feasible for the field of auto-transmission design and it’s better than traditional design method also. Then, the 3D modeling software Unigraghics is used to establish the helical gear model. In the fourth chapter of this paper, a special program which can design auto-transmission easily in the way of r