【作者】 刘晖；

【导师】 万朝燕；

【作者基本信息】 大连交通大学 ， 机械设计及理论， 2005， 硕士

【摘要】 齿轮传动是机械传动中应用最广泛的传动机构。它具有功率范围大、传动效率高、传动比准确、使用寿命长、工作安全可靠等特点。随着近代科学技术和工业生产迅速发展,对齿轮传动装置的承载能力提出了更高的要求,其中,齿轮的接触疲劳强度是评价齿轮承载能力的一个重要尺度。随着计算机技术的发展,目前已广泛采用有限元法对齿轮传动强度进行分析计算,因为有限元法能很好地处理齿轮受载后啮合接触面力学和边界条件,从而可对齿轮传动系统作更为准确的应力变形分析。 因为渐开线齿轮的齿廓形状主要由齿轮基本参数确定,使得齿轮的有限元模型建立过程多为重复性工作,为了避免不必要的重复,提高工作效率,有必要对齿轮进行参数化建模。 本论文利用I-DEAS软件本身的参数化设计功能,根据I-DEAS软件的宏命令,编写了渐开线直齿、斜齿圆柱齿轮外啮合,渐开线直齿锥齿轮外啮合传动的有限元建模程序,在I-DEAS中运行该程序文件,通过输入齿轮的传动类型、齿数、模数、压力角、螺旋角、变位系数等几何参数建立了齿轮啮合的实体三维模型。再根据齿轮结构的对称性及有限元分析的特点,只取三个齿轮对建立齿轮接触有限元模型,根据齿论材料的弹性模量、泊松比,齿轮运行时的载荷大小等参数划分有限元网格,细分接触处的网格,并根据齿轮传动的特点施加边界条件,从而完成齿轮传动从建立几何模型、划分网格、施加边界条件的有限元建模过程,再进行齿轮传动的静接触有限元分析,通过在后处理模块中观察计算结果,得出齿轮传动接触应力分布情况。为工程实践提供有效的检验手段。更多还原

【Abstract】 Gear transmission is used most extensively in mechanical transmission. It has the advantages of wide range power, high transmission efficiency, accurate drive ratio, long life and safety. With the development of industry and modern science technology, higher request on load-carry capacity of gear transmission system has been put forward, in which the contact strength is an important criterion. At the same time, the development of computer technology has made Finite Element Method (FEM) used widely in the analysis of gear transmission intensity. The reason is that FEM can deal with mechanical boundary condition very well, and can provide an exact stress analysis for gear transmission system.As we know, the profiles of involute gears are mainly determined by some basic parameters, which bring the gear modeling into repetition. For the purpose of increasing working efficiency, it’s necessary to realize parametric modeling for gear contact analysis.By using the parametric design function of I-DEAS software, programs on automatically modeling of cylinder involute spur gears, cylinder involute helical gears and straight involute bevel gears were designed based on some special language of I-DEAS software. Running these program files in I-DEAS and inputting parameters such as gear number, modulus, pressure angle, helix angle, change position, modulus of elasticity and position ratio of gear material, the load on driven gear, then the I-DEAS software can complete the work of modeling, meshing, applying boundary condition automatically. Analyzing gear contact, the user can observe the result in post processing model to get the stress of gear.With this method, the designer could get useful information on gear contact intensity to guide design.更多还原