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基于UG的汽车主减速器三维设计及仿真分析
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摘要
汽车主减速器是汽车传动系统的关键部件之一,弧齿锥齿轮作为减速齿轮具有承载能力强、传动平稳和安装精度要求低等优点;直齿锥齿轮作为差速器齿轮利用了结构紧凑,简单的特点。对于锥齿轮,齿轮齿廓精度决定了模型的精度,采用球面渐开线方程建立的渐开线生成的齿廓可以很好的保证齿形的精度。
     论文围绕汽车减速器齿轮的参数化设计问题,对弧齿锥齿轮和直齿锥齿轮进行了参数化建模方法进行了深入研究。
     目前,在锥齿轮的建模过程中,一般都采用背锥渐开线建模方法,尽管背锥渐开线锥齿轮的齿形与球面渐开线齿形非常接近,但总存在误差。针对这一情况,根据啮合原理,分析推导了球面渐开线方程。通过分析弧齿锥齿轮的加工成型原理,推导出易于在UG中实现的螺旋线参数方程,利用表达式的参数化建模方法,实现了球面渐开线弧齿锥齿轮的精确三维参数化造型。
     针对差速器直齿锥齿轮结构简单,具有很好的代表性,以UG/NX软件为平台,结合UG/OPEN二次开发模块、Visual C++6.0编程环境和Access数据库,建立了直齿锥齿轮参数化设计系统。利用UG/OPEN二次开发工具,采用UG/OPEN GRIP和UG/OPEN API混合编程方法,实现球面渐开线直齿锥齿轮程序化快速建模,大大提高齿轮建模的效率。
     在UG的装配模块中,在对差速器齿轮装配尺寸的基础上完成差速器壳的建模,实现自上而下的参数化三维造型设计,在完成减速器的总装配后进行了装配干涉检查。在高级运动仿真环境中,建立了运动分析方案,实现了机构的运动仿真和运动干涉,间隙测量等,验证齿轮运动机构设计的合理性等。
The main reducer is one of the key components of the car’s transmission system. The spiral bevel gears have high bearing capability, stable transmission and low accurate requirement of installation as the gears of the reducer; and the straight bevel gears take the feature of compact structure and simple as the gears of the differential. For the bevel gears, the precision of the model was determined by the accuracy of the teeth of the gear’s figure. And the teeth’s shapes which made by using the equations of spherical involute ensure the precision of the teeth’s figure of the gears.
     The paper researched the parameterized modeling method further with the spiral bevel gears and the bevel gears around parametric design problem of the car reducer.
     At present, typically use the model method of back cone involute while modeling bevel gears. Although the figure of the gears are very closely between the back cone involute and the spherical involute, but there always exists some error. According to this situation, analysed and deduced the spherical involute equations based on the meshing theory. The paper has deduced the spiral equations which easy to be used in UG according the processing & forming principle of spiral bevel gears and realized the accurate 3D parametric modeling of the spiral bevel gears with spherical involute by used the parametric modeling method of expressions.
     The paper used UG/OPEN secondary development and Visual C++ and Access databases to establish the parameterized design system of straight bevel gears according to simple structure of the differential’s bevel gears, which have good representative. Carry out the procedural fast modeling of the spherical involutes’straight bevel gear under the mixed procedure of UG/OPEN GRIP and UG/OPEN API to improve modeling efficiency.
     In the modual of UG, accomplish the model of the differential shell based on the assembly size of the differential gears, and to realize the design method of top-down 3D parametric modeling and the interference check after the total assembly of the reducer. Established the motion analysis program to realize the movement simulation and interference check and measuring clearance etc, which validate design rationality of the gear movement institution under the senior simulation environment of UG.
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