ISSN   1004-0595

CN  62-1224/O4

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预紧方式对弹流润滑下角接触球轴承内部力学特性的影响

Influences of Preload Methods on Internal Mechanical Characteristics of Angular Contact Ball Bearings under Elastohydrodynamic Lubrication

  • 摘要: 油膜厚度预测在评估弹流润滑(EHL)下角接触球轴承的性能和耐久性方面发挥着重要的作用. 耦合拟静力学理论和自旋下椭圆接触弹流模型,以干接触角接触球轴承拟静力学分析方法为基础,建立了定压和定位预紧方式下考虑弹流润滑和钢球自旋运动的角接触球轴承的拟静力学分析模型. 采用快速傅里叶变换(FFT)计算椭圆接触的弹性变形,运用Gauss-Seidel迭代方法求解Reynolds方程,得到自旋弹流模型的完全数值解,将其代入轴承拟静力学模型中迭代,得到轴承内部接触载荷、三维接触压力及三维膜厚分布. 对采用不同预紧方式的SKF7210型角接触球轴承进行分析,结果表明:富油润滑下,当轴承转速从0增大到15 000 r/min时,定压预紧时内圈轴向位移减小17.83%,而定位预紧时内圈承受的轴向载荷增大23.17%;定压预紧方式下球与内外滚道间膜厚均略大于定位预紧. 此外,不同预紧方式下,外圈上的中心膜厚大于内圈10%. 与干接触相比,定压下考虑弹流润滑内圈上接触载荷略大0.64%.

     

    Abstract: The oil film thickness prediction plays an important role in evaluating the performance and durability of angular contact ball bearings (ACBB) under elastohydrodynamic lubrication (EHL). Coupling the quasi-static theory and the elliptical contact EHL model with spinning, based on the quasi-static analysis methods of dry contact, a quasi-static analysis model of ACBB considering EHL and spin motion of steel ball was established under constant and rigid preload methods. The Fast Fourier Transform (FFT) method was used to calculate the elastic deformation for elliptical contact. Then Gauss-Seidel iteration method was used to solve the Reynolds equation, and the completely numerical solution of the spinning EHL model was obtained, which was substituted into the bearing quasi-static model iteratively. As a result, the bearing internal contact load, three-dimensional (3D) contact pressure and 3D film thickness distribution were obtained. The analysis of SKF7210 ACBB under different preload methods shows: under flooded lubrication condition, when the bearing speed increased from 0 to 15000 r/min, the axial displacement of the inner ring decreased by 17.83% under constant force preload, while the axial load on the inner ring increased by 23.17% under fixed position preload. The film thickness between the ball and the inner and outer raceways with constant preload was slightly larger than that with fixed position preload. In addition, the central film thickness on the outer ring was 10% greater than that on the inner ring under different preload methods. Moreover, the contact load considering EHL under constant force preload was slightly larger than that of dry contact by 0.64%.

     

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