三叉杆式联轴器中叉杆传递的圆周力及轴向力计算

通过建立正确的动力学坐标系，以方向余弦矩阵为工具，成功地解决了三叉杆式联轴器中输出的受力问题；推导出在理想状态下，此类型联轴器输出轴的受力情况，及影响其动力性能的各种因素。给出了此类型联轴器最佳的适用角度范围。     

三叉杆式万向联轴器移动副运动参数的误差分析

在三叉杆式万向联轴器有关移动副运动分析的基础上，充分考虑到机构制造和安装的不精确性，以及运动副轴承的间隙等因素，进行了三叉杆式万向联轴器与移动副有关的运动误差分析。结果表明，可通过合理选取各种结构参数，使运动精度在允许的范围之内。     

三叉杆式万向联轴器中有关运动参数的误差分析

在三叉杆式万向联轴器的运动分析的基础上,充分考虑到机构制造和安装的不精确性,运动副轴承的间隙．作用于连杆上力及温度变化引起的连杆变形等因素,进行了三叉杆式万向联轴器运动误差分析。结果表明可通过合理选取各种结构参数,使运动精度控制在允许的范围之内。     

等角速传动万向联轴器附加弯矩的确定

本文分析了等角速万向联轴器在传递动力时产生的附加弯矩,得出了等角速万向联轴器的附加弯矩矢量作用在输入轴和输出轴两轴构成的平面内的结论,并与十字轴万向联轴器的附加弯矩进行了比较,得出了等角速万向联轴器无偏转弯矩,而十字轴万向联轴器有偏转弯矩及等角速万向联轴器的附加弯矩与输入轴的转角φ_i无关,而十字轴万向联轴器的附加弯矩是转φ_i的函数的结论。     

三叉杆滑块式万向联轴器的运动分析

利用方向余弦矩阵对三叉杆滑块式万向联轴器的关键部件——滑块进行运动分析,得出了滑块的速度和加速度表达式。为这种万向联轴器后续的动力分析提供了基础,也为一般的运动分析提供了参考。     

基于RecurDyn的三叉杆滑移式万向联轴器疲劳寿命预测

在运动学分析的基础上,运用RecurDyn软件建立三叉杆滑移式万向联轴器刚柔耦合动力学仿真模型,深入分析了传动元件滑杆的接触应力随输入轴和输出轴夹角、转动频率、负载等参数的变化规律。在此基础上,基于应力时间历程寿命计算准则对三叉杆滑移式万向联轴器进行疲劳寿命预测。研究结果为进一步分析三叉杆滑移式万向联轴器的动力学特性和润滑特性打下基础,为其结构设计和推广应用提供依据。     

三叉杆-球笼式万向联轴器传动轴的运动仿真分析

针对三叉杆-球笼式万向联轴器传动轴结构复杂,难以采用传统的图解法、解析法获得其运动规律的问题,采用Pro/E软件,在充分考虑各构件之间的相互约束关系的基础上,对三叉杆-球笼式万向联轴器传动轴整体进行了三维建模,仿真分析了传动轴中关键零件钢球的运动规律,得到了输入轴和中间轴分别在10°、20°和30°夹角下钢球中心的位移、速度和加速度等运动曲线。仿真结果表明,钢球随输入轴的等速回转做近似周期性的简谐运动,并且两个联轴器夹角越大,各运动参数波动的幅度也越大;该仿真结果为合理设计三叉杆-球笼式万向联轴器传动轴,有效解决其在应用中的摩擦、磨损、润滑问题打下了基础。     

三叉杆滑移式万向联轴器的振动分析

阐述了应用传递矩阵法解决三叉杆滑移式万向联轴器机构中的振动问题。在分析中，同时考虑了两个方向的横向振动，轴向振动和扭转振动，讨论并建立了系统的传递矩阵和传递关系，得到了求解系统的固有频率的表达式，为三叉杆滑移式万向联轴器系统的性能分析提供了理论依据。     

三叉式万向联轴器的运动分析

介绍了三叉杆滑移式万向联轴器的输出轴采用双向心轴承安装时，通过建立合适的坐标系，利用坐标变换矩阵对向心关节轴承在三叉上的位移值和叉杆在导向槽中位移值的变化规律进行的分析研究。     

三叉杆滚子式万向联轴器传动中的效率分析

通过分析三叉杆滚子式万向联轴器传动过程中球形滚子与叉杆之间的滑动摩擦损失和滚子与导向槽之间的滑动摩擦损失而得出联轴器在任意输入角时的瞬时效率,最后经过积分运算而求出三叉杆滚子式万向联轴器传动中的平均效率。     

Dynamic analysis of cross shaft type universal joint with clearance

Cross shaft type universal joint is widely used in ground vehicles to transfer torque between two intersecting axes, and its transmission feature can make a great contribution to NVH performance of the vehicle. We looked at the assembling clearance at cross shaft neck, and presented a dynamic model of cross shaft type universal joint with clearance at cross shaft neck. Two-state model is applied to describe the contact force between the cross shaft and driving joint fork based on Hertz theorem, and lumped mass method is applied to build up the dynamic model of the universal joint. Based on this model, numerical analysis is carried out to discuss the transmission feature of the universal joint with clearance at cross shaft neck, and the influence of clearance on the dynamic behavior of the system is evaluated with numerical results based on time history, power spectrum, and phase portrait. The method and conclusions presented are helpful to improvement of the transmission feature of cross shaft type universal joint.     

转机万向接轴中间法兰断裂分析

介绍某厂轧机主传动万向接轴中间接管法兰及联接螺栓频敏断裂现象,分析其原因,制定解决方案,总结此类万向接轴安装使用及维护要点。     

Dynamics of universal joints, its failures and some propositions for practically improving its performance and life expectancy

A universal joint also known as universal coupling, U joint, Cardan joint, Hardy-Spicer joint, or Hooke??s joint is a joint or coupling in a rigid rod that allows the rod to ??bend?? in any direction, and is commonly used in shafts that transmit rotary motion. It consists of a pair of hinges located close together, oriented at 90° to each other, connected by a cross shaft. The Cardan joint suffers from one major problem: even when the input drive shaft rotates at a constant speed, the output drive shaft rotates at a variable speed, thus causing vibration and wear. The variation in the speed of the driven shaft depends on the configuration of the joint. Such configuration can be specified by three variables. The universal (Cardan) joints are associated with power transmission systems. They are commonly used when there needs to be angular deviations in the rotating shafts. It is the purpose of this research to study the dynamics of the universal joints and to propose some practical methods for improving their performance. The task is performed by initially deriving the motion equations associated to the universal joints. That is followed by elaborating on the oscillatory behavior in the rotational speed and the torque that transmits through the intermediary shaft. The forces in the joint bearings are calculated by using an analytical method that is also supported by the numerical modeling. Such models are also used in order to calculate the rhythm and the amount of the excess loads on the joint. This is suggested as a systematic procedure in the search for the causes of the failures in these popular bearings. With the same purpose in mind some defected bearings with deformed sections were selected for the laboratory examinations. By analyzing the loading behavior and the surface conditions of the defected bearings and by comparison with the known fatigue theories attempts are made in order to dig into the causes for the failures in these joints and their bearing surfaces. With the aim of improving the performance and the life expectancy of these popular elements of the machineries, some practical recommendations are also suggested.     

万向节两传动轴转角关系的三元复数推证方法

将平面二元复数的概念延伸、推广至三维复空间,以矢量为原型,以球坐标为依据,重申了三元复数模型的重要性.以此为数学工具,建立了三元复数的矢量运算规则.针对万向联轴节两传动轴转角关系式的推演,尝试了三元复数方法的使用.在此过程中,提供了一种新型的推证万向节两传动轴转角关系的有效方法.     

变速器后置对同步器的影响

介绍了变速器同步器和十字轴刚性万向节工作原理.当变速器后置时,由于十字轴万向节在客车上安装角度较大,会影响到变速器同步器的寿命,因而提出了改善对策.     

汽车用新型等速万向联轴器驱动轴的仿真研究

等速万向联轴器驱动轴在汽车传动系统中起着重要作用,其运动特性影响着汽车性能的好坏以及汽车的安全性。对此通过运动学仿真分析,求出各主要零部件的运动仿真结果,得出滑块在槽壳轨道轴线方向的运动量最大,是主要的运动部件;然后在ANSYS Workbench进行静力学仿真分析,通过新型等速万向联轴器驱动轴的应力、应变以及总变形情况,可知该等速万向联轴器驱动轴的危险部件及危险部位集中在三叉杆上。因此,需要增加它的强度,从而提高汽车用新型等速万向联轴器驱动轴的安全性。     

基于Archard模型的螺杆钻具十字万向轴啮合面磨损规律研究

十字万向轴对于螺杆钻具的扭矩与转速传递具有重要作用,然而十字万向轴的运动磨损使得传递效率大大降低。为探究十字万向轴啮合面的运动规律与防磨合金块的磨损规律,建立十字万向轴多体运动和合金块体积磨损量计算的联合仿真物理模型;依据赫兹接触理论和Archard磨损理论对仿真模型的接触边界条件进行设定,对磨损条件进行定义,研究共轭运动副啮合面之间的运动规律与接触力的变化规律;以多体运动仿真求解所得啮合面的运动路径和接触力峰值作为防磨合金块磨损分析的边界条件,研究不同结构形态对防磨合金块体积磨损量的影响规律。结果表明：当运动啮合稳定后,啮合面会产生沿着切向与轴向的合成方向做往复滑动摩擦运动,接触力呈现周期性波动规律;接触面不同结构形态与关键结构参数对合金块的磨损量有显著影响,采用凹双斜面结构可有效提升合金块的耐磨性。该研究可以为十字万向轴的结构优化设计及耐磨性的提高提供参考。     

三球销滑动装置的运动学分析

为了补偿轴向位移,经常在双十字万向联轴器的中间轴上采用轴向滑动装置。三球销滑动装置是目前公认的一种效果很好的轴向移动机构。本文采用方向余弦矩阵法,对该装置进行了运动学分析,并在此基础上,计算了该装置正常工作所必须的间隙,得出具有指导意义的结论。