车用球塞泵球塞副摩擦动力学模型的研究  

A Study on Tribo-dynamic Model for Ball Piston Pairs of Vehicle Ball Piston Pump

作　　者：许路[1] 魏超[1] 荆崇波[1] 林硕 

机构地区：[1]北京理工大学车辆传动国家重点实验室,北京100081 [2]福建计量科学研究院,福州350003

出　　处：《汽车工程》2016年第4期506-510,499,共6页Automotive Engineering

基　　金：国家自然科学基金(51105031);国防基础创新项目(VTDP 3303)资助

摘　　要：球塞泵由于体积小、功率密度高,且易于增大排量,故有较好的发展潜力。本文考虑了球活塞的油膜润滑和结构变形等作用,通过耦合摩擦润滑模型、动力学模型建立了球活塞摩擦动力学模型,分析了球活塞-外圈接触副、球活塞-缸体接触副两对点接触副的油膜压力和膜厚变化规律,获得了球活塞摩擦力和摩擦转矩,最后搭建试验台架进行了试验验证。结果表明:球活塞-缸体副润滑状态呈现弹流润滑、流体动压润滑相互转变的规律。相同工作压力下,球塞泵摩擦转矩随转速增加呈线性上升的趋势。Ball piston pump has a good development potential and application prospect due to its small vol- ume, high power density and the ease of expanding displacement. In this paper, a tribo-dynamic model for ball pis- ton is developed through coupling friction lubrication model and dynamic model, with consideration of the effects of oil-film lubrication and structural deformation of ball piston. Then the changing law of oil-film pressure and film thickness of two point-contact pairs （ball-outer ring pair and ball-cylinder bore pair） are analyzed, with the friction force and torque of ball piston obtained. Finally a test bench is built to conduct test verification. The results indicate that the lubrication condition of ball-cylinder bore pair shifts between elasto-hydrodynamic lubrication and hydrody- namic lubrication. Under the same operating pressure, the friction torque of ball piston pump shows a linear rising trend with the increase of operating speed.

关 键 词：球塞副 摩擦动力学模型 润滑特性 摩擦转矩 

分 类 号：U463.2[机械工程—车辆工程]