数值法研究空间啮合问题

本文以平面二次包络环面蜗杆传动为实例,应用数值方法研究空间啮合问题。通过模拟蜗杆磨削过程和蜗轮滚切过程,生成以一组平行平面曲线定义的蜗杆曲面及与之共轭的蜗轮齿面,观察设计参数和加工参数对蜗杆磨削区域大小的影响。这一方法为空间啮合传动曲面检测及预测啮合质量提供了数据基础。     

渐开线直齿圆柱齿轮几何参数的剖析

直齿圆柱齿轮是机械传动中应用最广泛的传动机构之一，齿轮能否正确啮合是由其几何参数决定，渐开线直齿圆柱齿轮的基圆与齿根圆是两个重要参数。剖析基圆与齿根圆、内啮合齿轮两基圆之间的关系对研究齿轮啮合原理有重要意义。     

有关机械传动型式选择的几个问题

1、引言 机械传动可以按力的传递原理分为两大类型: 1、啮合传动:如齿轮传动,蜗杆传动,链传动。 2、摩擦传动:如带传动,摩擦轮传动等。 啮合传动是靠传动元件上的齿强制传动。因此传动比恒定,尺寸紧凑,功率大,速度范围广、工作可靠,寿命长、维护少。这是好的一面,但是需要专门的制造设备和较高的制造技术。运行噪声大(蜗杆传动和螺旋传动除外),常常需要另外加弹性元件承受冲击,要附加保护装置防止过载,等等。啮合传动、尤其是齿轮传动是各种传动中应用得最广泛的一种     

齿轮传动综合实验系统设计及教学实践

基于数字散斑相关方法研制了齿轮传动综合实验系统。该系统由齿轮传动实验台和数据处理两部分组成,可进行齿轮齿廓啮合原理、参数测量、重合度测量等齿轮机构测量实验及弯曲强度、接触强度、齿间载荷分布检测等齿轮力学实验。通过齿轮传动的非接触式实时检测及图像分析,揭示并验证了齿轮啮合原理和齿轮强度理论。教学实践表明,将先进的测量技术引入实验教学中,有利于加深学生对基础理论知识的理解,提高机械原理、机械设计课程的教学水平。     

双惰轮的渐开线齿轮传动机构的设计

根据渐开线齿轮啮合原理，推导出双惰轮传动机构的正确啮合条件等式，并根据等式编程求解，设计悬索桥主缆缠丝机的双惰轮传动机构。     

渐开线齿轮啮合传动虚拟实验的实现

针对学生对实际渐开线齿轮齿廓及啮合传动过程理解的困难,设计并开发了渐开线齿轮啮合传动虚拟实验,实现了与加工实际情况相符的渐开线齿轮齿廓的精确绘制,以及齿轮啮合传动过程中齿轮旋转和啮合点移动的仿真,最后通过实例验证了该虚拟实验所实现的功能。     

基于OPENGL的渐开线齿轮数字化教学资源设计

应用计算机多媒体技术,对齿轮机构数字化教学资源进行建设和完善。初步完成了基于OPENGL技术,采用Delphi为开发语言的齿轮机构数字化教学资源设计。系统可动态展示渐开线的生成、啮合传动和仿真范成实验。     

内啮合变位齿轮传动的应用

本文论述了内啮合变位齿轮传动的应用；论述了外齿轮齿数的选择以及变位系数的优化设计。     

多路功率分流齿轮啮入时序的优化研究

针对传统外啮合齿轮箱功率密度较小,传递大功率时增大模数而导致齿轮箱尺寸剧增的问题,基于渐开线标准齿轮传动正确啮合条件及重合度计算理论,提出以多路功率分流外啮合定轴齿轮传动替代传统单外啮合齿轮传动,根据啮入点啮入时序排布方式,设计了同步啮入与依序逐步啮入两套方案。以3路功率分流的外啮合定轴齿轮传动为案例,通过复合重合度计算推导,发现在相同重合度下,与同步啮入时序方案相比,采用依序逐步啮入时序方案,齿轮传动更为平稳,在相同传动比、相同模数情况下,齿轮承载能力提高1/3。由此得出结论,以多路功率分流外啮合定轴齿轮传动,并采用各路啮入点依序逐步啮入时序方案,可以在有效提高齿轮箱的功率密度,大幅减少齿轮箱尺寸基础上,获得平稳传动,提高齿轮承载能力。     

标准插齿刀改磨为专用插齿刀的近似计算

改磨标准插齿刀为专用插齿刀有时不失为一种高效、优质加工齿轮的好方法。应用无侧隙啮合传动方程式，阐述改磨插齿刀的原理和计算方法，并通过实例加以说明。     

精密数控谐波传动系统研究

作研发了一套高精度、低成本的精密数控谐波传动系统，并就如何提高精密数控谐波传动系统的传动精度和动态性能进行了分析探讨，指出要获得高精度的数控谐波传动系统必须充分考虑谐波传动的啮合性能、加工精度、系统的动态性能和电机的矩频特性及其控制技术的机电性能匹配问题。     

A method for the global optimization of the tooth contact pattern and transmission error of spiral bevel and hypoid gears

In this paper, we present a method for the global optimization of the tooth contact pattern and transmission error of spiral bevel and hypoid gears, which includes three optimization objectives, three control parameters, and a complex-constrain genetic algorithm solving method. A new set of fundamental equations for pitch cone parameters of hypoid gear drives are established, as well as the relationships between pitch cone and curvature parameters. Based on this theory, three control parameters are selected to determine the pinion tooth surface. A hypoid gear drive is chosen for case studies. The results verify that the optimization methodology can achieve the expected optimization objectives and has good convergence. Correlations between optimization objectives and control parameters are discussed. Furthermore, a finite element model of a simplified hypoid gear drive system is established and its quasi-static meshing characteristics analyzed. The results again confirm the correctness of the optimization method. The effects of torque load on the contact pattern and transmission error are discussed. The results provide a theoretical reference for geometric calculations, quasi-static analysis, and optimal design of spiral bevel and hypoid gears.     

章动内啮合渐开线螺旋锥齿轮齿面接触分析

对章动传动中内啮合渐开线螺旋锥齿轮的齿面接触特性进行分析。根据章动内啮合螺旋锥齿轮啮合原理,在建立由渐开线曲线和齿根过渡曲线组成的法向基本齿廓方程基础上,推导内啮合渐开线螺旋锥齿轮齿面方程,并建立其三维模型。在有限元软件中建立渐开线螺旋锥齿轮齿面接触分析的有限元模型,从接触面积、接触压强、接触力及Mises 应力等方面对齿面接触特性进行分析,分析结果有助于章动内啮合螺旋锥齿轮的改进设计。     

Mathematical modeling and characteristics analysis for the nutation gear drive based on error parameters

We focused on the mathematical modeling and characteristics analysis for the nutation drive based on error parameters. The crown gear tooth profile equation was introduced according to the national standard double circular arc tooth profile and based on the equal tooth strength principle. The nutation drive meshing coordinate system was set up by introducing the cone vertex error, tilt error, nutation angle error and spiral angle error. The tooth profile equations of the double circular arc external and internal spiral bevel gears were further obtained based on the crown gear tooth profile equation concerning above mentioned error parameters. The influences of the nutation gear reducer tooth contact conditions were analyzed with the gear tilt error and axial misalignment error. Finally, the correctness of the theoretical analysis was verified by the contact spot test.     

Excitation prediction by dynamic transmission error under sliding friction in helical gear system

Monte Carlo method was adopted to calculate the meshing error considering the manufacture error and assembly error of the meshing point along the time-varying contact line for helical gear pair. The flexural-torsion-axis dynamic model coupled was established under the tooth friction force and solved by the perturbation method to compute real dynamic tooth load. The change laws of the friction force and friction torque were obtained in a meshing period. The transmission error formulation was analyzed to introduce meshing excitations. The maximum dynamic transmission error, the maximum meshing force and the maximum dynamic factor were calculated under different speeds, external loads and damping factors. The conclusions can provide theoretical basis for the gear design especially in tooth profile correction.     

谐波齿轮波发生器外轮廓形状的研究与改进

主要针对凸轮式波发生器,根据使用薄壁轴承的不同,对其外轮廓形状进行了改进,使波发生器外表面与柔轮桶体内壁贴合,从而提高谐波齿轮的啮合性能。     

斜齿轮啮合刚度的计算

根据梅泽清彦(umezawa)斜齿轮振动模型，改进后得出齿轮传动中斜齿轮啮合刚度的计算公式，为齿轮传动动态特性的研究打下基础。