基于瞬态接触的齿轮温度场研究

发布时间：2018-04-05 14:26

本文选题：直齿轮　切入点：瞬态接触　出处：《东北大学》2012年硕士论文

【摘要】：齿轮是重要的基础机械元件,在机械传动中占有主导地位,齿面摩擦力造成的影响有：降低齿轮的传动效率,加快齿轮的破坏(胶合、点蚀),造成齿轮的系统振动和噪声。齿轮的摩擦是造成传动效率下降的主要原因,特别是在重载荷、高速、大功率的齿轮传动中。本文基于齿轮啮合原理,齿轮动力学,摩擦学和传热学,用Pro/E软件建立三维模型,并用有限元软件对模型进行分析,本文主要内容有 (1)用Pro/E软件建立了渐开线圆柱直齿轮模型,用ANSYS软件对模型进行静力分析,并与经典的赫兹接触理论进行对比。 (2)计算了齿轮装配体自由状态下的模态分析与预应力状态下的模态分析,并用齿轮瞬态冲击扭振来验证计算结果,提出了联合经典的动力学模型求解齿轮系统的真实的振动频率,并研究了齿轮刚度的非线性。 (3)采用了新的计算模型,计算了在不同工况下、不同转速下及不同修形量下对齿轮的时变动载荷的真实影响,计算了单个齿面法向作用力和总法向作用力,并进行了对比讨论。 (4)用MATLAB编制了求解弹流润滑的程序,并与经典的几个油膜公式比较了计算准确性,计算了齿轮啮合过程中的时变油膜厚度,求取了混合润滑状态下的时变摩擦系数,啮合过程中的热流密度及分配关系,对主动轮和从动轮的啮合面和端面进行了对流散热计算。 (5)计算了几组不同修顶量和粗糙度工况下基于瞬态接触的齿轮稳态温度场并进行了对比。
[Abstract]:Gear is an important basic mechanical element, which plays a leading role in mechanical transmission. The influence of tooth surface friction on gear transmission is as follows: reducing gear transmission efficiency, speeding up gear destruction (gluing, pitting), resulting in gear system vibration and noise.The friction of gears is the main cause of the decrease of transmission efficiency, especially in the heavy load, high speed, high power gear transmission.Based on the theory of gear meshing, gear dynamics, tribology and heat transfer, the three-dimensional model is built by Pro/E software, and the model is analyzed by finite element software. The main contents of this paper are as follows1) the involute cylindrical spur gear model is established by using Pro/E software. The static analysis of the model is carried out with ANSYS software, and the model is compared with the classical Hertz contact theory.The modal analysis of gear assembly in free state and the modal analysis in prestressing state are calculated, and the results are verified by the transient shock and torsional vibration of gear.In this paper, a classical dynamic model is proposed to solve the real vibration frequency of gear system, and the nonlinearity of gear stiffness is studied.In this paper, a new calculation model is used to calculate the real influence of the changing load on the gear under different working conditions, different rotational speeds and different modifications, and the normal force and the total normal force on the single tooth surface are calculated and compared.In this paper, a program for solving elastohydrodynamic lubrication is developed with MATLAB, and the accuracy of calculation is compared with some classical oil film formulas. The time-varying oil film thickness during gear meshing is calculated, and the time-varying friction coefficient under mixed lubrication is obtained.The heat flux density and distribution relation during meshing are calculated for the meshing surface and the end surface of the active wheel and the driven wheel.The steady temperature field of gear based on transient contact is calculated and compared.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.41

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