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工程科学与技术:2016,48(Z2):173-179
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基于真实粗糙表面斜齿轮瞬态混合弹流润滑研究
(四川大学空天科学与工程学院)
Research of Transient Mixed Elastohydrodynamic Lubrication Model of Helical Gear with Consideration of Real Roughness Surface
(School of Aeronautics &Astronautics, Sichuan University)
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投稿时间:2015-11-30    修订日期:2016-04-03
中文摘要: 将渐开线斜齿轮啮合过程中的轮齿接触等效为一个三维无限长线接触问题,建立了用于求解斜齿轮三维瞬态弹流混合润滑计算的数学模型。考虑斜齿轮啮合实际工况,分析啮合过程中齿面时变半径,时变表面切向速度的变化等,引入真实的三维机械加工粗糙表面, 联合统一的Reynolds方程方法分析了单个轮齿在整个啮合过程中三维瞬态弹流润滑完全数值解,讨论了光滑表面和真实机械加工粗糙表面对轮齿啮合过程的膜厚和压力分布的影响,揭示了2种机械加工表面的微观弹流润滑特性。结果表明:粗糙表面对齿轮润滑状况影响显著,尤其在轮齿啮出过程中,严重的降低了齿轮间的润滑油膜厚度,使轮齿润滑状况变得恶劣;粗糙表面加工精度高(粗糙度低),其接触表面的膜厚比高,接触区域和接触负载小,故而润滑状况好。
Abstract:The three-dimensional (3D) elastohydrodynamic lubrication (EHL) model of the involute helical gears was developed by simplifying the contact between tooth surfaces in the mesh of a pair of helical gears into a infinite line-contact lubrication problem. The time-varying contact parameters of helical gears such as the variations of radius of curvature and tangential surface velocities in the mesh were considered in the analysis model. Based on the unified Reynolds equation approach,the transient solutions of the entire meshing process were obtained for a pair of teeth with consideration of real 3D roughness surface. The effects of smooth and rough machining surfaces on the film thickness and pressure distribution during tooth engagement are discussed , and it reveals the microscopic EHL characteristics of two kinds of machined surface. The results show that rough surface has a significant effect on gear lubrication condition, especially in the process of the gear tooth out of engagement , which serious reduce the lubricating film thickness between the gear tooth with lubricating conditions become bad. High precision surface roughness make the high ratio of film thickness of the contact surface, the small contact area and load, therefore lubrication get excellent.
文章编号:201501288     中图分类号:    文献标志码:
基金项目:高性能弧齿锥齿轮和准双曲面齿轮传动应用基础研究 51435001
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引用文本:
李文广.基于真实粗糙表面斜齿轮瞬态混合弹流润滑研究[J].工程科学与技术,2016,48(Z2):173-179.
Li Wenguang.Research of Transient Mixed Elastohydrodynamic Lubrication Model of Helical Gear with Consideration of Real Roughness Surface[J].Advanced Engineering Sciences,2016,48(Z2):173-179.