轴向柱塞泵端面开槽配流副动压支撑特性

针对轴向柱塞泵配流副容易出现磨损的问题,为改善其润滑特性,研究轴向柱塞泵配流副配流端面开槽对其动压支撑特性的影响.建立并分析配流副动压支撑特性的数学模型,根据流量守恒定理,利用有限体积法对矢量形式的雷诺方程进行数值离散,分析配流端面开槽后动压分布规律以及支撑作用效果,得到全膜润滑状态下摩擦因数的变化规律,并建立了配流副实验台进行实验验证.结果表明:在一定条件下,配流端面辅助支撑带开槽对配流副动压支撑性能起正效果,并且随着开槽数目的增加,配流副动压支撑性能改善;存在一个在配流端面开槽与未开槽结构形式下支撑特性相同的特征倾斜角;在特定的缸体倾斜角下,可以选择相应开槽深度,即在该槽深的"特征倾斜角"大于该缸体倾角,配流端面辅助支撑带开槽可以改善配流副动压支撑性能.

Effect of grooved face on the dynamic pressure support characteristics of cylinder/valve plate pair in the axial piston pump

To improve the lubrication characteristics of cylinder/valve plate in the axial piston pump, the dynamic pressure support characteristics with the grooved flow distribution face is studied. A theoretical dynamic pressure model is established. According to the law of conservation of flow and by applying the finite volume method to numerical discretization, the distribution law of dynamic pressure and the effect of support with the grooved face are analyzed, and the change law of the friction coefficient under the whole film lubrication condition is obtained as well. A test rig is built to verify the test results. Under certain conditions, the auxiliary support belt with grooves is beneficial to dynamic pressure support characteristics. With the increase of numbers of grooves, the dynamic pressure support is improved. There is a feature inclination angle at which the dynamic pressure support characteristics with grooved flow distribution face is the same as with non-grooved flow distribution face. At a particular cylinder inclination angle, the corresponding groove depth at which the "feature inclination angle" is larger than the cylinder inclination angle could be selected, so that the dynamic pressure support characteristics of cylinder/valve plate pair could be improved by auxiliary support belt with grooves.