Investigation on the radial micro-motion about piston of axial piston pump
Investigation on the radial micro-motion about piston of axial piston pump
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DOI：
10.3901/cjme.2013.02.325
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发表时间：
2013-03
影响因子：
4.2
通讯作者：
Bing Xu;Jun-hui Zhang;Huayong Yang;Bin Zhang
中科院分区：
文献类型：
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作者：
Bing Xu;Jun-hui Zhang;Huayong Yang;Bin Zhang
轴向柱塞泵的极限工作参数和使用寿命取决于其关键摩擦副的承载能力和润滑特性。因此，关键摩擦副的设计与优化一直是轴向柱塞泵研究的重点和难点。传统的活塞/缸副研究中，将活塞与缸筒的装配关系简化为理想圆柱副，无法详细分析活塞径向微动对油膜厚度和压力分布特性的影响。基于油膜润滑理论，建立了考虑粗糙度、活塞弹性变形和压粘效应影响的数值仿真模型。利用仿真模型，分析了径向微动和压力分布的动态特性，讨论了径向微动与承载能力、润滑条件和磨损之间的关系。在此基础上，设计了一台用于测量活塞与缸筒间油膜压力分布的模型泵。压力分布的仿真结果与实验结果的对比表明，该仿真模型具有较高的精度。实验和仿真结果表明，由于径向微动的影响，活塞腔内的压力分布存在峰值，且峰值远高于活塞腔内的边界压力，活塞的磨损主要发生在靠近活塞球的手部。另外，提高活塞和缸筒的加工圆度和直线度，有助于提高活塞/缸副的承载能力。研究结果可为轴向柱塞泵的设计提供参考，有助于提高轴向柱塞泵的使用寿命。
The limit working parameters and service life of axial piston pump are determined by the carrying ability and lubrication characteristic of its key friction pairs. Therefore, the design and optimization of the key friction pairs are always a key and difficult problem in the research on axial piston pump. In the traditional research on piston/cylinder pair, the assembly relationship of piston and cylinder bore is simplified into ideal cylindrical pair, which can not be used to analyze the influences of radial micro-motion of piston on the distribution characteristics of oil-film thickness and pressure in details. In this paper, based on the lubrication theory of the oil film, a numerical simulation model is built, taking the influences of roughness, elastic deformation of piston and pressure-viscosity effect into consideration. With the simulation model, the dynamic characteristics of the radial micro-motion and pressure distribution are analyzed, and the relationships between radial micro-motion and carrying ability, lubrication condition, and abrasion are discussed. Furthermore, a model pump for pressure distribution measurement of oil film between piston and cylinder bore is designed. The comparison of simulation and experimental results of pressure distribution shows that the simulation model has high accuracy. The experiment and simulation results demonstrate that the pressure distribution has peak values that are much higher than the boundary pressure in the piston chamber due to the radial micro-motion, and the abrasion of piston takes place mainly on the hand close to piston ball. In addition, improvement of manufacturing roundness and straightness of piston and cylinder bore is helpful to improve the carrying ability of piston/cylinder pair. The proposed research provides references for designing piston/cylinder pair, and helps to prolong the service life of axial piston pump.