球活塞式液压泵锥形配流副自适应润滑特性

在广泛应用于液压泵中的端面配流和轴配流的基础上,提出一种应用于球塞泵中的锥形配流方式,对受到冲击载荷的工作状态下配流轴的动态变化规律进行研究. 根据其结构原理推导出润滑模型,对配流轴进行受力分析,建立关于配流轴的在轴向和径向两个自由度的动力学模型. 通过对动力学方程的数值求解,得到配流轴位置随冲击载荷的变化规律,发现配流轴相对缸体的偏心率以及配流间隙经过波动后能够在较短时间内建立新的平衡状态. 配流轴这种不依靠外力由震荡恢复稳定的能力体现了自适应的润滑特性,保证了球塞泵工作的可靠性.
In this paper, the steady condition of conical spindle distribution and its dynamic response under the changing load is investigated. The lubrication model in spherical coordinate system is developed based on the particular structure, and from force analysis, the dynamic model of conical spindle distribution in axial and radial freedoms is also constructed. The static and dynamic lubricating performance including the shaft eccentricity and distribution gap height is obtained by solving the model with a numerical method. The result shows that the shaft eccentricity and distribution gap height oscillates intensely under the impact loading and gets back to a balance position in a short time. Such a self-adaptive feature of the lubrication performance of conical spindle distribution without requiring external adjustment is significant to ensure the reliability as the ball piston pumps are working.