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由于双螺旋摆动油缸的双螺旋式传动结构在油缸工作过程中会产生螺旋副油膜间隙。螺旋间隙流动的存在,会形成油膜润滑,降低传动摩擦系数;还会造成油液内泄漏,影响容积效率。利用Pro/E三维设计软件设计并建立了7种不同周向间隙的螺旋副油膜模型,导入Ansys Workbench 14中进行网格划分并设立边界条件。在Fluent中基于湍流S-A模型与SIMPLEC算法对不同周向间隙的螺旋副间隙流场进行仿真。通过仿真结果,得到了螺旋副速度场、压力场、流量、承载力与螺旋副周向间隙的关系,并且分析了油膜间隙对螺旋传动精度的影响,为今后摆动油缸双螺旋副结构设计与螺旋副间隙优化提供了理论依据与重要参考。
Due to the double-helix swinging cylinder double-helical transmission structure in the cylinder during the helical oil film will have a gap. Spiral gap flow exists, will form the oil film lubrication, reducing transmission friction coefficient; also cause oil leakage, affecting the volumetric efficiency. Seven kinds of helical oil film models with different circumferential clearances were designed and built with Pro / E 3D design software and imported into Ansys Workbench 14 for meshing and boundary conditions. Based on the turbulent S-A model and the SIMPLEC algorithm in Fluent, the helical sub-gap flow field with different circumferential clearances is simulated. Through the simulation results, the relationship between the velocity field, the pressure field, the flow rate and the bearing capacity of the helical pair and the circumferential clearance of the helical pair was obtained, and the influence of the clearance of the oil film on the precision of the helical transmission was analyzed. Vice clearance optimization provides a theoretical basis and important reference.