车用柱塞泵配流副径向表面轮廓对稳态润滑特性影响的研究

A Study on the Effects of Radial Surface Profile on the Steady Lubrication Characteristics of Cylinder/Valve Plate Pair in Vehicle Plunger Pump

使用表面形貌仪实际测量了配流盘径向表面轮廓,同时假设缸体径向表面轮廓具有理想型、内凹型和内凸型3种类型,并使用倾斜方位描述法建立了考虑径向表面轮廓的油膜厚度模型;结合柱坐标系下稳态润滑控制方程,对比分析3种径向表面轮廓对偶形式配流副的动压力分布及其效果,最后搭建稳态润滑试验台进行试验验证。试验与仿真结果表明:与实测配流盘配合的理想平整缸体动压生成能力最强,但因加工问题无法实际应用,内凹型缸体动压能力次之,可应用于配流副工程设计,而内凸型缸体生成动压能力最差;内凹型缸体-实测配流盘对偶的配流副摩擦因数符合经典Stribeck曲线,其反映润滑状态转变的临界速度随负载的增大而升高。

The radial surface profile of valve plate is measured using a surface motpholigy instrument and with an assumption that the radial surface profile of cylinder has ideal,inner convex and inner concave three types,an oil film thickness model with considerstion of radial surface profile is built with inclined azimuth description method. Then combined with the steady lubrication control equation under cylindrical coordinates,the dynamic pressure distribution and its effects of cylinder/valve plate pair for three mating types of radial surface profiles are comparatively analyzed. Finally a steady lubrication tester is constructed to perform verification test. The results of simulation and test show that though the ideal smooth cylinder matched with valve plate tested has most strong ability in generating dynamic pressure,but can not be practically applied due to manufacturing difficulty; next to it is inner concave cylinder with a reasonable ability in generating dynamic pressure and can be applied to the engieneering design of cylinder/valve plate pair; while inner convex cylinder is most inferior in terms of dynamic pressure generation ability. The friction coefficient of inner cobcave cylinder/valve plte tested pair is in accordance with classical Stribeck curve,demonstrating the critical velocity reflecting the transformation of lubrication states rises with the increase of load.