柱塞副微运动轨迹及微倒角对其影响分析

Micro-motion of piston/cylinder interface and the influence of micro chamfering on it

针对轴向柱塞泵柱塞副由于接触造成的磨损问题,建立了柱塞副油膜弹性流体动压润滑数值仿真模型,在此基础上分析了柱塞在缸体孔内微运动轨迹及柱塞与缸体接触状态.提出了柱塞微深度倒角的结构改进措施,通过仿真对比了不同尺寸倒角对接触程度的影响.结果表明:微深度倒角有利于减少柱塞与缸体孔的接触,倒角深度对减少接触的作用比倒角长度更加明显;所提出的数值模型和改进措施有利于实现柱塞泵的优化设计,通过降低柱塞副的磨损最终提高柱塞泵的寿命和可靠性.

To solve the wear between piston and cylinder due to contact,the elastohydrodynamic numerical model of oil film on piston was established and the micro motion of piston was studied to analyse the contact status between piston and cylinder. Micro-depth chamfering was introduced to realize the structural optimization design. The impact of different size chamfering on piston contact status was compared.The results show that micro-depth chamfering is beneficial to reduce the contact between the plunger and the cylinder and the chamfering depth has more obvious effect than the chamfering length.The numerical model and optimization measures proposed in this paper has the potential to realize the optimal design of the piston pump and improve its service life and reliability by reducing the wear of the piston and cylinder.