基于接触分析的斜齿轮修形方法研究

发布时间：2018-05-30 03:36

本文选题：行星齿轮传动 + 轮齿修形　；参考：《天津大学》2012年硕士论文

【摘要】：斜齿圆柱齿轮传动具有啮合平稳、承载能力强等优点，行星齿轮传动装置具有结构紧凑、体积小、重量轻、传动比大等优点，汽车自动变速器常采用斜齿行星齿轮传动装置。齿轮的制造、安装误差及啮合过程中轮齿变形等因素会引起啮合冲击并伴有噪声和振动，齿轮轴的弯曲变形和扭转变形会导致轮齿承受载荷分布不均、承载能力下降，一般的改善方法是对轮齿作齿廓修形和齿向修形，研究表明，轮齿修形可有效减轻啮合冲击、消除轮齿边缘接触和齿向偏载，对减振降噪、提高齿轮承载能力和使用寿命很有意义，具有重要工程应用价值。本文围绕汽车行业对轮齿修形的重要需求，以某轿车自动变速器中一级斜齿行星传动装置为研究对象，提出了一种快速参数化有限元建模方法，对内齿圈和行星轮啮合副的齿廓修形和齿向修形、啮合特性及动力接触分析等进行了较为深入的研究，主要研究成果如下： 1.基于ANSYS APDL参数化编程设计语言，提出斜齿行星传动装置的快速参数化建模方法，该方法具有准确简便及参数易修改等优点，为修形设计和啮合特性分析奠定了基础。 2.基于有限元分析，，提取轮齿沿啮合线方向的位移确定最大齿廓修形量，设计齿廓修形曲线，通过参数化语言实现齿廓的微量修整，并对齿廓修形前后啮合应力与接触应力做分析与对比研究。 3.提取行星轮的弯曲变形和扭转变形，确定鼓形量和螺旋角修形量，进行鼓形修形和螺旋角修形，并对修形前、后的接触应力做对比分析，研究表明螺旋角修形比鼓形修形更适用于齿向修形。 4.将啮合周期等分并建立各啮合位置综合修形前、后的齿圈段模型，深入分析最大啮合应力和最大接触应力随啮合位置的变化情况。 5.建立不同修形条件下啮出位置的有限元模型，基于正交试验确定了各修形因素对啮合特性的影响规律，给出了修形因素的最优组合。 6.使用ANSYS/LS-DYNA模拟传动过程，并分析了动态啮合特性，研究表明修形能够消除啮合冲击，同时明确了转速对动态接触力波动和齿轮副振动的影响。
[Abstract]:Helical cylindrical gear transmission has the advantages of stable meshing, strong bearing capacity and so on. The planetary gear transmission has the advantages of compact structure, small volume, light weight, large transmission ratio and so on. The manufacturing, installation error and tooth deformation of gear will cause meshing shock and noise and vibration. The bending deformation and torsional deformation of gear shaft will lead to the uneven distribution of load and the decrease of bearing capacity. The research shows that the gear tooth modification can effectively reduce the meshing impact, eliminate the tooth edge contact and tooth bias load, and reduce vibration and noise. It is of great significance to improve the bearing capacity and service life of gears, and has important engineering application value. In this paper, a fast parameterized finite element modeling method is put forward, which is focused on the important requirement of gear tooth modification in automobile industry, and takes the first class oblique planetary transmission of a car automatic transmission as the research object. The tooth profile modification, meshing characteristics and dynamic contact analysis of inner gear and planetary gear meshing pair are studied deeply. The main results are as follows: 1. Based on ANSYS APDL parametric programming language, a rapid parameterized modeling method for oblique tooth planetary transmission is proposed. The method is accurate, simple and easy to modify, which lays a foundation for shape modification design and meshing characteristic analysis. 2. Based on the finite element analysis, the displacement along the meshing line of the gear tooth is extracted to determine the maximum tooth profile modification, and the profile modification curve is designed, and the micro-dressing of the tooth profile is realized by parameterized language. The meshing stress and contact stress before and after tooth profile modification are analyzed and compared. 3. The bending deformation and torsional deformation of planetary gear are extracted, the drum shape and spiral angle modification are determined, and the contact stresses before and after modification are compared and analyzed. The results show that helical angle modification is more suitable for tooth modification than drum modification. 4. The meshing period is divided equally and the gear ring segment model is established before and after the combined modification of each meshing position, and the variation of the maximum meshing stress and the maximum contact stress with the meshing position is analyzed in depth. 5. The finite element model of the meshing position under different modification conditions is established. Based on the orthogonal test, the influence of each modification factor on the meshing characteristics is determined, and the optimal combination of the modification factors is given. 6. ANSYS/LS-DYNA is used to simulate the transmission process, and the dynamic meshing characteristics are analyzed. The results show that the modification can eliminate the meshing impact, and at the same time, the influence of the rotational speed on the dynamic contact force fluctuation and the vibration of the gear pair is clarified.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.41

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