圆柱凸轮侧向传动机构最小油膜厚度计算公式
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摘要
圆柱凸轮侧向传动机构是一种新型的减速机构,与弧面凸轮传动机构相比承载力更大。为研究圆柱凸轮侧向传动机构啮合过程中的润滑状态,依据Hamrock-Dowson公式,推导出稳态工况下圆柱凸轮侧向传动机构线接触最小油膜厚度计算公式。该公式表明对润滑油膜厚度影响较大的因素主要有润滑油黏压系数、常压下润滑油动力黏度、转速、圆柱半径、滚子半径及从动盘节圆半径,因此可通过优化结机构构及调整机构工况来改善机构润滑状态。采用该最小油膜厚度计算公式计算某圆柱凸轮侧向传动机构在稳态工况下最小油膜厚度及膜厚比,分析该机构工作时的润滑状态,并提出其润滑状态的优化方案。
The cylindrical cam lateral transmission mechanism is a new type of deceleration mechanism,which has greater bearing capacity than the globoidal cam drive mechanism. In order to study the lubrication state of cylindrical cam lateral transmission mechanism in meshing process,according to the Hamrock-Dowson formula,the minimum oil film thickness calculation formula of cylindrical cam lateral transmission mechanism under steady conditions was derived.The formula reflects the main factors affecting the oil film thickness,including the viscosity-pressure coefficient and dynamic viscosity of lubricating oil under normal pressure and the rotational speed,the radius of cylinder and roller and the circle radius of the driven disc,and the lubrication state of the mechanism can be improved by optimizing the structure and working conditions of the mechanism. The minimum oil film thickness and the film thickness ratio of a cylindrical cam lateral transmission mechanism were calculated with the derived formula,the lubrication state of the mechanism under working condition was analyzed,and the optimization scheme of lubrication state was put forward.
The cylindrical cam lateral transmission mechanism is a new type of deceleration mechanism,which has greater bearing capacity than the globoidal cam drive mechanism. In order to study the lubrication state of cylindrical cam lateral transmission mechanism in meshing process,according to the Hamrock-Dowson formula,the minimum oil film thickness calculation formula of cylindrical cam lateral transmission mechanism under steady conditions was derived.The formula reflects the main factors affecting the oil film thickness,including the viscosity-pressure coefficient and dynamic viscosity of lubricating oil under normal pressure and the rotational speed,the radius of cylinder and roller and the circle radius of the driven disc,and the lubrication state of the mechanism can be improved by optimizing the structure and working conditions of the mechanism. The minimum oil film thickness and the film thickness ratio of a cylindrical cam lateral transmission mechanism were calculated with the derived formula,the lubrication state of the mechanism under working condition was analyzed,and the optimization scheme of lubrication state was put forward.
引文
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【2】黄平.弹性流体动压润滑[M].北京:清华大学出版社,2015.
【3】王优强,刘冬伟,李伟.渐开线斜齿轮瞬态弹流润滑数值分析[J].润滑与密封,2008,33(7):25-29.WANG Y Q,LIU D W,LI W.Numerical analysis of instantaneous elastohydrodynamic lubrication for helical gears[J].Lubrication Engineering,2008,33(7):25-29.
【4】鲍培德,谢俊,尹小琴,等.行星齿轮变速传动的弹流润滑研究[J].润滑与密封,2011,36(2):12-16.BAO P D,XIE J,YIN X Q,et al.Study on elastohydrodynamic lubrication of planetary gear transmission[J].Lubrication Engineering,2011,36(2):12-16.
【5】徐彩红,王优强,范晓梦,等.齿轮齿条传动机构等温稳态弹流润滑数值分析[J].机械传动,2017(3):64-67.XU C H,WANG Y Q,FAN X M,et al.Numerical analysis of the steady-state isothermal elastohydrodynamic lubrication of gear rack transmission[J].Journal of Mechanical Transmission,2017(3):64-67.
【6】王志坚,沈雪瑾,陈晓阳,等.有限长线接触弹流理论研究的最新进展[J].摩擦学学报,2016,36(1):117-131.WANG Z J,SHEN X J,CHEN X Y,et al.Recent progress of elastohydrodynamic lubrication of finite line contacts[J].Tribology,2016,36(1):117-131.
【7】付振山,冯显英,李蕾,等.钢球滚子弧面分度凸轮机构弹流润滑分析[J].农业机械学报,2011,42(6):208-212.FU Z S,FENG X Y,LI L,et al.Elastohydrodynamic lubrication analysis of globoidal indexing cam with steel ball[J].Transactions of The Chinese Society of Agricultural Machinery,2011,42(6):208-212.
【8】杨婷婷,董明望,吴林.圆柱凸轮侧向传动耦合机理与运动学特性分析[J].武汉理工大学学报,2016,38(2):93-97.YANG T T,DONG M W,WU L.Coupling mechanism and kinematic characteristic analysis of cylindrical cam lateral motion[J].Journal of Wuhan University of Technology,2016,38(2):93-97.
【9】董明望,吴林,戴明辉,等.圆柱凸轮侧向传动机构圆柱凸轮廓面研究[J].中国机械工程,2014,25(3):337-340.DONG M W,WU L,DAI M H,et al.Research on cylindrical cam lateral transmission mechanism profile[J].China Mechanical Engineering,2014,25(3):337-340.
【10】林顺洪,朱新才,李长江,等.基于Pro/E和ADAMS的圆柱分度机构参数化建模及仿真(英文)[J].机床与液压,2015,43(12):110-115.LIN S H,ZHU X C,LI C J,et al.Parametric modeling and simulation of the cylindrical Indexing cam mechanism based on Pro/E and ADAMS[J].Machine Tool&Hydraulics,2015,43(12):110-115.