修形参数对直齿锥齿轮性能影响的研究

发布时间：2018-01-07 21:06

本文关键词：修形参数对直齿锥齿轮性能影响的研究　出处：《济南大学》2012年硕士论文　论文类型：学位论文

【摘要】：直齿锥齿轮作为差速器上的重要零件，其工作性能好坏直接影响齿轮的传动效率。由于精锻成形技术在制造效率、节约材料和工时等方面具有突出优势，因而精锻直齿锥齿轮广泛应用于实际生产中。随着汽车工业的发展，对齿轮传动质量要求也越来越高，尤其是在高速、重载传动情况下对齿轮运动准确性、传动平稳性以及承载均匀性要求更加严格。虽然通过提高齿轮制造精度可以提高传动的准确性，但是轮齿的弹性变形仍然会使得齿轮副在啮合时产生振动及噪声。已有实践和理论分析验证，合理的齿形修形可以减少齿轮在啮入、啮出时的冲击，改善载荷分布，降低振动和噪声。修形技术能更好的满足直齿锥齿轮向高速、重载、低噪方向发展的要求。直齿锥齿轮三维实体建模精度，影响齿轮后续的有限元分析仿真结果以及制造精度。由于直齿锥齿轮轮廓比较复杂，很多学者都是采用背锥原理进行实体建模，这种方法不够准确。本文利用Matlab和SolidWorks相结合的方法实现了球面渐开线直齿锥齿轮的三维造型，不仅提高了建模效率，也提高了建模精度。为了研究修形参数对直齿锥齿轮性能影响，结合设计的修形参数，最终完成了适合仿真需要的修形直齿锥齿轮三维模型，为有限元模型的建立提供了一定的技术支持。用ANSYS/LS-DYNA有限元软件对直齿锥齿轮进行动态仿真分析。详细介绍了直齿锥齿轮有限元接触分析模型的建立过程，包括定义合理单元、网格划分、边界条件及载荷的加载。分析了直齿锥齿轮在传动过程中存在变载荷情况下，修形参数对轮齿变形及受力影响的变化规律，并提取了直齿锥齿轮的轴向加速度和角加速度两个结果，分析修形参数对直齿锥齿轮动态响应的影响。通过理论计算验证了有限元模拟分析结果的可信性。在实际工作过程中，直齿锥齿轮装配误差是难以避免的，其对齿轮工作性能影响也比较显著。为了探究修形参数对有装配误差直齿锥齿轮工作性能的影响，本文利用LS-DYNA分析软件对其进行动力学接触仿真分析，计算了锥齿轮副在不同轴交角偏差下轮齿应力分布及变形，分析轴交角偏差与修形量大小匹配后对应力、应变的影响关系，所得仿真实验结果对于实际生产中具有一定的参考价值。
[Abstract]:As an important part of differential gear, the performance of straight bevel gear directly affects the transmission efficiency of gear. Due to the advantages of precision forging technology in manufacturing efficiency, material saving and man-hour, etc. As a result, precision forging straight bevel gears are widely used in practical production. With the development of automobile industry, the quality of gear transmission is more and more high, especially in the case of high-speed, heavy-duty transmission gear movement accuracy. The requirements of transmission smoothness and load uniformity are more strict, although the accuracy of transmission can be improved by improving the accuracy of gear manufacturing. But the elastic deformation of gear still causes vibration and noise of gear pair in meshing. It has been proved by practice and theoretical analysis that reasonable tooth shape modification can reduce the impact of gear in and out of the gear. To improve load distribution and reduce vibration and noise, the shape modification technology can better meet the development of straight bevel gear in the direction of high speed, heavy load and low noise. The accuracy of 3D solid modeling of straight bevel gear affects the simulation results of the subsequent finite element analysis and manufacturing accuracy of the gear, because the profile of straight bevel gear is more complex. Many scholars use the back cone principle to model the solid. This method is not accurate. This paper uses Matlab and SolidWorks to realize 3D modeling of spherical involute straight bevel gear, which not only improves the efficiency of modeling. In order to study the effect of profile modification parameters on the performance of straight bevel gear, the three-dimensional model of modified bevel gear is finally completed, which is suitable for simulation. It provides some technical support for the establishment of finite element model. The dynamic simulation analysis of straight bevel gear is carried out by using ANSYS/LS-DYNA finite element software. The process of establishing the finite element contact analysis model of straight bevel gear is introduced in detail, including the definition of reasonable element. Mesh division, boundary condition and load loading. The influence of modification parameters on gear tooth deformation and force is analyzed under the condition of variable load in the transmission process of straight bevel gear. Two results of axial acceleration and angular acceleration of straight bevel gear are extracted and the influence of shape modification parameters on the dynamic response of straight bevel gear is analyzed. The credibility of finite element simulation results is verified by theoretical calculation. In the process of practical work, the assembly error of straight bevel gear is difficult to avoid, and its influence on the performance of gear is obvious. In order to explore the influence of modification parameters on the working performance of straight bevel gear with assembly error. In this paper, the dynamic contact simulation analysis of bevel gear pair is carried out by using LS-DYNA analysis software, and the stress distribution and deformation of bevel gear pair under different axial angle deviation are calculated. The relationship between stress and strain caused by the deviation of axis intersection angle matching with the size of shape modification is analyzed. The results of simulation experiments are of certain reference value in practical production.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.41

【参考文献】