基于有限元分动箱齿轮啮合分析

Meshing analysis of gear in gearbox based on the finite element

由于分动箱运行环境较为恶劣,船式拖拉机行驶过程中受到外部激励和内部激励,必然会导致整车的振动并产生噪声,影响船式拖拉机工作效率和驾驶舒适性。本文建立分动箱输入级一级齿轮对模型,分析其额定工况下齿轮啮合过程齿接触应力、齿面啮合区法向载荷、齿轮时变啮合刚度。分析结果表明,额定扭矩为2.5e^6 N·mm时,齿轮轮齿单齿啮合区齿面接触应力、法向载荷、齿轮时变啮合刚度比双啮合区大,分析2.2e^6 N·mm,2.35e^6 N·mm,2.5e^6 N·mm三种工况,得到其最大啮合刚度分别为:51.041 N/(mm·μm);54.329 N/(mm·μm);57.634 N/(mm·μm),即随着扭矩的增大,齿轮轮齿综合啮合刚度也增大。为降低齿轮传动过程产生振动与噪声和分动箱系统优化设计提供依据。

As the operating environment of the gearbox is relatively harsh, the ship tractor is driven by external and internal incentives, which will inevitably lead to vibration and noise of the whole vehicle, affecting the working efficiency and driving comfort of the ship tractor.In this paper, a gear pair model for the input stage of the gearbox is established to analyze the contact stress, normal load of gear surface meshing zone and time-varying meshing stiffness of the gear under rated working conditions. The analysis results show that when the rated torque is 2.5 e6 N·mm, the tooth surface contact stress, normal load and gear time-varying meshing stiffness of the gear tooth single tooth meshing area are larger than the double meshing zone, and the analysis is 2.2 e^6 N·mm, 2.35 e^6 N·mm, 2.5 e^6 N·mm three working conditions, the maximum meshing stiffness is: 51.041 N/(mm·μm);54.329 N/(mm·μm);57.634 N/(mm·μm), that is, with the increase of torque, gear teeth The overall meshing stiffness also increases. It provides a basis for reducing the vibration and noise generated in the gear transmission process and optimizing the design of the transfer case system.