In this paper, the dynamic contact characteristics between a piston system and a cylinder block in a spherical pump are studied theoretically and numerically. The theoretical contact model between a piston and a cylinder is established based on its structural and operational properties, to obtain the maximum contact force quantitatively. The effects of different structural parameters and working pressures on the contact force are analyzed and discussed. The relationship between friction coefficient and rotation speed is presented. The contact pairs are modeled numerically using the finite-element method and augmented Lagrange algorithm to obtain both the tangential and normal contact characteristics. Both static and dynamic contact characteristics of the piston are analyzed and discussed. These proposed studies can provide practical suggestions on improving the wear resistance performance and durability of the spherical pump.

本文从理论和数值上研究了球形泵中活塞系统与气缸体之间的动态接触特性。基于活塞和汽缸的结构和操作特性，建立其理论接触模型，以定量获得最大接触力。分析和讨论了不同的结构参数和工作压力对接触力的影响。提出了摩擦系数与转速之间的关系。使用有限元方法和增强拉格朗日算法对接触对进行数值建模，以获取切向和法向接触特性。分析和讨论了活塞的静态和动态接触特性。