Torsional rigidity of freewheel mechanisms in drives

The torsional rigidity of roller and eccentric frictional and nonfrictional freewheel mechanisms is compared.     

谐波齿轮传动重合度的计算方法研究

针对谐波齿轮传动的特殊性提出谐波齿轮重合度的定义,即柔轮和刚轮轮齿的啮合区间角与刚轮单个齿距圆心角的比值。基于瞬心线运动几何学,推导出柔轮和刚轮轮齿的相对瞬心线方程,然后根据Willis定理的结论,计算出柔轮和刚轮之间的啮合区间角,最后由重合度定义计算出重合度。此计算方法适用于各种不同齿形的谐波齿轮传动重合度的计算,对于衡量新齿形谐波齿轮传动的啮合性能,具有重要的参考意义,因此该方法具有通用性。     

Torsional rigidity of rolled steel sections

Results of recent torsion tests on steel I-sections have shown that the member's torsional rigidity may be of the order of 60 per cent higher than the value given by simple theory and further that these measured values possess considerable scatter. This paper presents an explanation of these points in terms of the residual stresses present in the section. From the results of a study of a number of sections, a simple formula, based on only one geometrical parameter, is proposed for calculating correction factors to be applied to the value of the torsional rigidity as determined by conventional methods.     

谐波齿轮传动柔轮的变形分析

柔轮是谐波齿轮传动装置的主要部件,柔轮的变形直接影响柔轮的应力、寿命及谐波齿轮传动机构工作的可靠性.本文通过理论推导,建立了双波谐波齿轮传动环形柔轮变形量、截面弯矩的计算模型,提出了柔轮变形敏感度的概念,并对柔轮变形的敏感度与中性层曲率半径变化进行了仿真,得出了柔轮齿数的合理取值范围及柔轮圆环危险截面的位置,可为柔轮的性能分析、改进设计提供参考.     

HSK热装刀柄工具系统扭转刚度分析

针对影响HSK热装刀柄工具系统扭转刚度的特性参数进行分析,找出其对系统扭转刚度的影响规律,并通过回归分析得出对系统扭转刚度最显著的影响因素,以对实际应用提供理论指导.分析结果表明,过盈量是对系统扭转刚度影响最显著的因素,过盈量以及夹持量对系统扭转刚度均成正影响,而转速对系统扭转刚度成负影响.     

谐波齿轮传动柔轮的应力和疲劳强度分析

柔轮的工作应力和寿命决定了整个谐波减速机的传动性能,对柔轮的应力和疲劳强度的研究,有利于提高谐波传动精度和柔轮使用寿命.从理论的角度计算了某型号谐波齿轮减速机的杯型柔轮空载下的应力峰值和负载时柔轮的疲劳安全系数,利用Inventor建模和ANSYS Worbench仿真软件验证了计算结果的可靠性,得到了柔轮最大等效应力...     

一种新型谐波传动试验台的研制

介绍所研制的一种新型的适于模拟空间环境下的谐波传动试验台--双伺服扭杆加载谐波传动试验台.该试验台采用扭杆作为加载构件,通过扭杆两端的两台伺服电动机控制扭杆的弹性变形,实现扭矩加载;电子测控系统以工控机为控制中心,以PMAC控制扭矩加载,具有简明易用的可视化人机界面;可以实现8种系统特性的自动检测;具有精度高、自动化程度高、环境适应性强等特点.     

Technological solution to profile and generate the teeth of central gear for precessional gear drives

The transmission based on precessional gear pairs, mostly used for rotation speed reduction, has some important advantages relative to the common gear drives, such as the capability to produce very low transmission ratios, or the high loading capacity/dimensions ratio (due to the fact that all the teeth of a precessional gear pair are simultaneously in contact during its functioning). One among the likeliest constructive solutions for the precessional gear pair uses a satellite built with conical rollers. However, its practical use is restricted by the difficulty to realize the central gear teeth machining without using special and relative complicated devices. This paper introduces a technological substitutive profile for the central gear tooth, which enables the use of a simpler and more productive method for working it, without bringing major negative consequences regarding the teeth contact correctness or the drive loading capacity. The profile was found by analyzing the contact surface and the pressure angle evolution during the contact between conjugate teeth. The paper also presents technological solutions to generate the new tooth profile by milling it with a disk-tool or an end-mill cutter, together with methods to profile the required tools.     

谐波齿轮传动柔轮变形与变形力研究

针对新型弹性波发生器的提出,建立了谐波齿轮传动柔轮变形与变形力的计算模型,并对XB1-100-80机型的柔轮进行了变形量与变形力测试实验,通过对测得的实验数据进行拟合分析,对柔轮变形与变形力的计算模型进行了修正,为新型弹性波发生器的设计提供了理论依据.     

谐波传动柔轮的优化设计

将多目标优化方法应用于谐波齿轮传动设计,建立了柔轮优化设计的数学模型;求解该模型,可得到整体优化的结构设计方案,使谐波传动在满足承载能力及强度要求条件下,效率最高、体积最小.     

端面谐波齿轮传动的啮合分析理论

比较完整地阐述端面谐波齿轮传动的啮合分析理论,编制端面谐波齿轮传动的啮合分析计算程序,并确定相应的啮合参数和结构参数的自动设计方法。这些理论和方法对端面谐波齿轮传动的开发和研制有重要的参考价值。     

谐波齿轮传动及其在阀门电动装置上的应用

简要介绍了谐波齿轮传动的特点、结构、工作原理及其在阀门电动装置上的成功应用。     

谐波减速器在自重构机器人的应用研究

自重构机器人的提升机构用于机器人系统攀爬台阶类障碍时抬起前边的机器人,要求提升机构具有很大的减速比、输出转矩等,谐波减速器谐波齿轮传动是一种新型传动技术,具有运动精度高、传动比大、重量轻、体积小等特点,实验结果表明,谐波减速器能够很好地满足机器人系统对提升机构的要求.     

Design and machining of the epicycloid planet gear of cycloid drives

This paper presents a mathematical model and design procedures to design the epicycloid planet gear of cycloid drives. It is based on coordinate transformation, envelope theory, and theories of conjugate surfaces, from which the equation of meshing is derived, while the path of machining tools is obtained by the equidistant curve principle. In addition, a program is developed to solve the equations of meshing and conjugate surfaces. Therefore, the epicycloid-profile is obtained. Then, these data are used to construct the 2D drawing and solid modeling of the epicycloid-planet-gear using AutoCAD and Pro/E (a CAD software package), respectively. The CAD data is used for machining, in this case by a wire-cutting machine. The manufactured component is presented to demonstrate that the design procedures and manufacturing are feasible. The design approach and machining method are suitable for applying CAD and CAM in industrial fields.     

On modeling and vibration of gear drives influenced by nonlinear couplings

Gear drives are one of the most common parts in many rotating machinery. When the gear drive runs under lower torque load, nonlinear effects like gear mesh interruption can occur and vibration can be accompanied by impact motions of the gears. This paper presents an original method of the mathematical modeling of gear drive nonlinear vibrations using modal synthesis method with degrees of freedom number reduction. The model respects nonlinearities caused by gear mesh interruption, parametric gearing excitation caused by time-varying meshing stiffness and nonlinear contact forces acting between journals of the rolling-element bearings and the outer housing. The nonlinear model is then used for investigation of gear drive vibration, especially for detection of nonlinear phenomena like impact motions, bifurcation of solution and chaotic motions in case of small static load and in resonant states. The theoretical method is used for investigation of two-stage gearbox nonlinear vibration.     

基于遗传算法的谐波齿轮传动优化设计

以谐波齿轮在模数m,柔轮筒体长L,齿宽b,简体壁厚δ为优化参数,依据遗传算法的基本原理,将遗传算法运用于谐波齿轮的参数化设计中,同归实例分析,对比结果说明将遗传算法应用于谐波齿轮传动优化设计中是可行和有效的,为谐波齿轮的优化设计提供了一种新的有效可行的方法。     

基于二维简化模型的谐波传动启动力矩分析

利用有限元数值方法,分析了XB1-120-100型谐波传动二维模型各主要运动副摩擦系数对启动力矩的影响,结果表明,谐波传动启动力矩值随滚动体与轴承内圈间摩擦系数的增大而线性增大,其余运动副摩擦系数的变化对启动力矩值几乎无影响.当各运动副摩擦系数取常用值时,通过有限元数值计算得到谐波传动启动力矩值为0.1128Nm,与XB1-120-100型谐波传动的标称启动力矩值(0.18Nm)相当.上述分析方法及结果对谐波齿轮传动设计及性能分析研究具有指导意义.     

基于挠性构件变形的谐波齿轮装配模型

依据柔轮装配前后的变形关系和中性层曲线不伸长条件,提出采用等分弧长分布算法来确定装配状态柔轮中性层曲线上轮齿位置及其轮齿对称线的转角,给出了装配状态柔轮的三维模型参数化生成方法。通过与传统等效圆环变形理论的近似算法和精确算法的比较表明,等分弧长分布算法与精确算法的结果非常贴近。在此基础上建立了基于挠性构件装配变形的谐波齿轮装配模型,可直观显示轮齿间的啮合情况和侧隙分布。模型应用实例验证了所提方法的有效性。