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采煤机摇臂齿轮固热耦合分析与齿廓修形

发布时间:2018-02-14 02:03  文章来源:笔耕文化传播

  本文关键词: 齿轮 接触温度 闪温 热变形 齿廓修形 Romax 出处:《煤炭学报》2017年06期  论文类型:期刊论文


【摘要】:基于赫兹接触理论建立齿轮啮合力学模型,依据渐开线形成原理推导出滚动距离和滚动角变化规律,以牛顿冷却定律和傅里叶定律为理论基础,结合采煤机摇臂工作特性,对齿轮系统对流换热和摩擦热流量进行计算,在对流换热系数确定中综合考虑齿轮与润滑油,润滑油与箱体内壁,箱体外壁与外界空气的热传递特性,以Blok理论为基础,本体温度为初始温度,分析了齿轮表面闪温和接触温度随滚动距离及滚动角变化规律。采用Romax Design建立了采煤机摇臂齿轮传动系统模型,对惰轮轴齿轮副进行固热耦合分析,基于Romax微观几何修形理论对渐开线齿廓进行修形,分析了齿廓修形对温度场影响。结果表明:齿廓修形消除了赫兹接触应力瞬增现象,最大接触应力减少72 MPa,修形后高温区由齿顶和齿根向齿廓中部移动,改善了轮齿温度分布,最高温度降低31.4℃。为研究采煤机摇臂齿轮传动系统修形及优化提供了理论基础。
[Abstract]:Based on Hertz's contact theory, the gear meshing mechanics model is established, and the rolling distance and rolling angle change law is deduced according to the involute forming principle. Based on Newton's cooling law and Fourier's law, combined with the working characteristics of the shearer's rocker arm. In the calculation of convection heat transfer and friction heat flux of gear system, the heat transfer characteristics of gear and lubricating oil, lubricating oil and the inner wall of the box, the outer wall of the box and the outside air are considered synthetically in the determination of the convection heat transfer coefficient, which is based on the Blok theory. The change of surface flash temperature and contact temperature with rolling distance and rolling angle was analyzed. The driving system model of rocker arm gear of shearer was established by Romax Design, and the solid-heat coupling analysis was carried out on the gear pair of idler shaft. Based on Romax's microscopic geometric modification theory, the influence of tooth profile modification on temperature field is analyzed. The results show that tooth profile modification eliminates the transient increase of Hertz contact stress. The maximum contact stress is reduced by 72 MPa, and the high temperature region moves from the top of the tooth and the root of the tooth to the middle of the tooth profile after modification, which improves the temperature distribution of the gear teeth and reduces the maximum temperature by 31.4 鈩,

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