速度图解法在行星齿轮系运动分析中的教学应用

通过教学实践,与相对角速度法相比较,行星齿轮传动分析中的速度图解法具有形象直观的特点,易为学生掌握,收到良好的教学效果。     

汽车自动变速器辛普森机构中单向离合器的作用分析

汽车自动变速器的部件比较复杂，许多从事自动变速器维修及相关工作的技术人员对其某些机构(如单向离合器)的理解不够全面，许多专业资料对于单向离合器的作用也没有系统的分析。本文以丰田A43DE自动变速器为例，详细分析了自动变速器中辛普森式行星齿轮机构中的各个单向离合器的设计意图，及他们的作用和工作原理，以供借鉴。     

行星齿轮传动中齿数对行星轮载荷的影响

从齿轮时变啮合刚度出发，建立了单级2K-H渐开线行星齿轮传动的集中质量参数型振动模型，以行星架作为参考坐标，将齿轮啮合的刚度近似成时变分段线性的弹簧刚度，采用模态叠加的原理，通过系统在刚度变化时的速度以及位移的连续性条件，在时域范围内模拟系统的振动过程。分析了不同齿数齿轮对啮合力的影响，最后得出：在2K-H渐开线行星齿轮传动中，若太阳轮与内齿圈均为行星轮个数的整数倍时，行星轮的均载效果好；太阳轮与内齿圈的齿数不为行星轮个数的整数倍时，行星轮之间出现偏载；系统有数个与初始刚度相关的稳定点的结论。     

虚拟装配技术在辛普森行星齿轮机构教学中的应用

辛普森行星齿轮机构是汽车自动变速器中应用非常广泛的一种变速机构,该机构比较复杂,成为高职教学中的难点。基于Pro／E软件,利用虚拟装配技术设计了零件模型,完成装配拆卸和运动仿真,结合Authorware软件制作了CAI教学课件,通过CAI软件的辅助教学,最终收到了良好的教学效果。     

不完全齿轮传动机构传动误差分析及消除方法

根据齿轮啮合原理 ,分析了不完全齿轮传动机构传动误差产生的原因 ,提出了消除误差的具体计算方法     

虚拟装配技术在辛普森行星齿轮机构教学中的应斥

辛普森行星齿轮机构是汽车自动变速器中应用非常广泛的一种变速机构,该机构比较复杂,成为高职教学中的难点。基于Pro／E软件,利用虚拟装配技术设计了零件模型,完成装配拆卸和运动仿真,结合Authorware软件制作了CAI教学课件,通过CAI软件的辅助教学,最终收到了良好的教学效果。     

自动变速器行星齿轮变速机构一体化教学探讨

自动变速器行星齿轮机构教学,可通过实施一体化教学方法,使复杂的自动变速器行星齿轮变速传动机构的构造简单化,抽象的原理通俗化,从而明显提高教学效果.     

自动变速器行星齿轮变速机构一体化教学探讨

自动变速器行星齿轮机构教学,可通过实施一体化教学方法,使复杂的自动变速器行星齿轮变速传动机构的构造简单化,抽象的原理通俗化,从而明显提高教学效果。     

Finite element analysis of internal gear in high-speed planetary gear units

The stress and the elastic deflection of internal ring gear in high-speed spur planetary gear units are investigated. A rim thickness parameter is defined as the flexibility of internal ring gear. Six evenly spaced linear springs are used to describe the fitting status between internal ring gear and the gearcase, The finite element model of the whole internal ring gear is established by means of Pro/E and ANSYS. The loads on meshing teeth of internal ring gear are applied according to the contact ratio and the load-sharing coefficient. With the finite element analysis （FEA）, the influences of flexibility and fitting status on the stress and elastic deflection of internal ring gear are predicted. The simulation reveals that the principal stress and deflection increase with the decrease of rim thickness of internal ring gear. Moreover, larger spring stiffness helps to reduce the stress and deflection of internal ring gear. Therefore, the flexibility of internal ring gear must be considered during the design of high-speed planetary gear transmissions.     

Translational torsional coupled model based nonlinear dynamic analysis of an NGW planetary gear train

This paper aims to investigate the nonlinear dynamic behaviors of an NGW planetary gear train with multi-clearances and manufacturing/assembling errors. For this purpose, an analytical translational ? torsional coupled dynamic model is developed considering the effects of time-varying stiffness, gear backlashes and component errors. Based on the proposed model, the nonlinear differential equations of motion are derived and solved iteratively by the Runge-Kutta method. An NGW planetary gear reducer with three planets is taken as an example to analyze the effects of nonlinear factors. The results indicate that the backlashes induce complicated nonlinear dynamic behaviors in the gear train. With the increment of the backlashes, the gear system has experienced periodic responses, quasi-periodic response and chaos responses in sequence. When the planetary gear system is in a chaotic motion state, the vibration amplitude increases sharply, causing severe vibration and noise. The present study provides a fundamental basis for design and parameter optimization of NGW planetary gear trains.     

球磨机齿轮传动的润滑分析

以大同市永和新荣水泥有限责任公司Φ1 .8× 7m球磨机为例 ,运用弹流理论分析了在正常工况条件下 ,球磨机齿轮传动的齿面润滑状态可实现变粘度弹流润滑 ,并进一步分析了润滑剂和润滑方式的选择是保证弹性流体动压油膜存在及厚度的主要因素。     

Backlash analysis of a new planetary gearing with internal gear ring

Due to low carrying capacity and short life of current ring reducer, we proposed a new planetary gearing with internal gear ring, which consisted of two stages. One was an involute planetary drive and the other was an N-type planetary drive with small teeth difference. The kinematic calculation was conducted based on the analysis of structural composition and working principle. Formulas of backlash calculation for the new planetary gearing were derived by using probabilistic theory and the analytical model was created at the same time. Then, main factors that affect the systematic backlash were introduced and the effects of manufacture error, misaligments and roller bearing parameters on the distribution of backlash were presented. The influence of gear backlash on systematic return difference was performed based on the backlash mathematic model proposed. The results show that the backlash is a little large, of which the backlash of bearing takes a greater part than two gearing stages. So we presented some practical methods to reduce the systematic backlash.     

行星齿轮系统的频响特性测试试验研究

以2K-H行星齿轮传动系统为研究对象,给出固有频率的计算结果。在此基础上,研究了该系统的频响特性试验,包括试验台的布置及其试验方案的设计;测得系统的频率响应函数和固有频率,并将试验结果与理论计算结果进行了对比分析。     

平面机构位置分析中的图解法

介绍了矢量的加减及两个未知矢量方程的四种性质,论述了利用回路闭合方程进行平面机构位置分析的原理,阐明了利用图解法进行运动学分析方便性.     

用Visual Basic 6.0实现平面齿轮系传动比的计算

对于任一含有m对啮合齿轮的平面齿轮系，都可列出m个表示构件间转速关系的形式相同的线性方程式。由于这些线性方程式的形式相同，所以可通过Visual Basic6．0编程很容易地列出这些线性方程式并求解之，从而获取平面齿轮系的传动比。     

基于形体分析法 利用“图话”绘制复杂机件剖视图

熟练掌握剖视图的绘制,是制图教学的重要内容之一.通过教学实例,提出了一种基于形体分析法的,利用"图话"绘制复杂机件剖视图的方法.使用该方法,可以规范、准确地进行剖视图绘制,绘制过程符合人们的思维习惯和逻辑顺序.     

麦氏关系式与麦氏恒等式的图表推导法

麦氏关系式与麦氏恒等式，是热力学理论中两组非常重要的公式，但是由于麦氏关系式与恒等式公式多，且都用偏导数表示，变量多且交替出现，难以记住，给学生学习掌握和使用这些公式带来很大困难。在教学中，作者发现一种简单易学，便于记忆，容易推导出麦氏关系式与麦氏恒等式的方法-图表推导法。     

Prediction for dynamic characteristics of ring-plate planetary indexing cam mechanism

This paper is aimed to propose an approach to predict the dynamic characteristics of ring-plate planetary indexing cam mechanism, which is a novel type of indexing mechanism that employs internal planetary transmission structure. Firstly, the geometry and structure of the mechanism are discussed and the kinematic practicability is simulated with virtual prototype design. Then a 3D finite element model of the ring-plate planetary indexing cam mechanism is developed with the commercial software of MATLAB and ANSYS. Through the finite element analysis, the natural frequencies and the corresponding mode shapes are predicted in one motion cycle. On the basis of the virtual prototype design and finite element analysis, an experimental prototype is made and tested to validate the prediction of the dynamic characteristics. The agreement between experimental results and the finite element analysis testifies that the finite element model developed is applicable to the prediction of the dynamic characteristics of this type of mechanism.