【作者】 王发辉；

【导师】 刘莹；

【作者基本信息】 南昌大学 ， 机械设计及理论， 2008， 硕士

【摘要】 随着机械零件的承载能力和速度要求越来越大,零件润滑显得尤其重要。在设计齿轮传动时,能够确保齿轮在啮合区中,具有足够厚度的润滑油膜,把摩擦表面完全隔开,则可以避免齿轮轮齿的润滑失效,延长使用寿命,而且还能使齿轮轮齿承受高压,提高齿轮的承载能力。其中弹性流体动力润滑是一种基本润滑状态,作者就针对弹流润滑进行了研究。本文在牛顿流体特性前提下,根据弹性流体动力润滑理论,推导出等温线接触弹流润滑的Reynolds方程、膜厚几何方程,建立了相应的数学模型,对弹流润滑问题进行了理论研究;通过本文开发的程序计算,得到完全数值解,获得了弹流润滑油膜压力分布及形状曲线图;本文还就节点数对弹流油膜压力及形状影响作了详细分析;此外对水润滑下弹流润滑进行数值分析;运用等温线接触弹流润滑理论,对齿轮的弹流润滑进行了数值求解,讨论了载荷、速度以及润滑油粘度对其影响;对聚醚醚酮塑料齿轮与钢制齿轮啮合弹流润滑进行了研究,在相同载荷、速度情况下,与水润滑下弹流润滑的数值结果进行了对比分析;给出算例对齿轮啮合中润滑状态进行判定。数值计算结果表明:计算区域节点的取值越多,得到数值结果就越慢;在水润滑下,水膜压力没有出现第二次压力峰,水膜形状的紧缩现象也并不很明显,这点不同于油润滑下的弹流润滑特性;载荷和速度变化会引起水膜膜厚的变化,速度增加,水膜膜厚增加,而对水膜压力影响甚小;载荷、速度以及润滑油粘度对齿轮的弹流润滑特性有着不同程度的影响,载荷的影响主要表现在油膜压力上,齿轮的速度是影响弹流润滑膜厚的重要因素,润滑油粘度对油膜膜厚有较大的影响;在相同载荷和速度下,塑料/钢齿轮副在润滑油润滑下产生的压力大于水润滑下产生的压力,最大油/水膜压力数值上增大可达到20%左右,在接触区内,形成的油膜比水膜稳定。更多还原

【Abstract】 With the mechanical parts requirements growing of carrying capacity and speed, lubricating the parts becomes particularly important. In the design of gears transmission, ensuring that the gears have sufficient thickness of lubrication film in the mating area, completely separated from the friction surface, which can be avoided the lubrication failure to the gear’s tooth so as to extend the service life, but also make the gear’s tooth withstand high pressure and increase the carrying capacity of gear. Then Elasto-Hydrodynamic Lubrication is one of basic lubrication states, and the author has addressed the EHL make studies.The paper based on the premise that fluid performs Newton performance, the author has made full use of Elasto-Hydrodynamic Lubrication theory, deducted the Reynolds equation, the thickness geometric equation of isotherm EHL line contact, setted up the corresponding mathematical model to make the theoretical research about the EHL issues; Through the calculate program development and calculating, the author has obtained fully numerical solutions, gained the curves of the EHL film pressure distribution and film shape; This paper has made a detailed analysis about nodes influences on the EHL film pressure and the shape, and furthermore made EHL numerical analysis under the water lubrication; Then using isotherm EHL line contact theory, the author has made numerical solution to the gear EHL, discussed the parameters of load, operation speed, lubrication oil viscosity effects on itself; and made the EHL research between PEEK plastic and steel gears meshing. In the same load, speed circumstances, the author has compared and analyzed the numerical results under the oil lubrication with under water lubrication. Finally give an example of the meshing of gears to judge the state of lubrication.The numerical analysis showed that: In the calculating regional the more nodes have, gain the numerical results more slowly; Under the water lubrication, the pressure of water film does not appear second-pressure, the shape of the water film does also not have shrink phenomenon obviously, which is different from the EHL characteristics under the oil lubrication; load and speed changes will cause changes in water film thickness, as the speed increases, the water film thickness also increases, then influence on the water film pressure very small; Then load, speed and lubricating oil’s viscosity has different varying degrees impact on gear EHL, the load mainly affects in the film pressure, the speed of gear is an important factor in film thickness, the viscosity of lubrication oil has the greater impact on film thickness; In the same load and speed, plastic/steel gears meshing produce the greater film pressure under the oil lubrication than one under the water lubrication, the biggest oil/water film pressure increases up to 20 percent and forms film stability than the water film in the contact regional.更多还原