The Impact of Positive Overlap Design on the Mechanical Efficiency of Two-dimensional Piston Pumps
The two-dimensional piston pump,due to its transmission mechanism based on rolling friction,is well-suited for use as a power element in electro-hydrostatic actuators.However,two-dimensional piston pumps employing shaft distribution are prone to internal leakage,leading to poor volumetric efficiency under high loads.To address this issue,positive overlap designs are commonly adopted.In order to explore the impact of two-dimensional piston positive overlap designs on pump mechanical efficiency.Mathematical modeling of pump mechanical efficiency and chamber pressure is performed to investigate the effects of positive overlap design on chamber pressure,input torque,and mechanical efficiency.Comparative analysis of experimental results between zero clearance and positive overlap two-dimensional pistons yields the following conclusions:Due to the uniform acceleration and deceleration cam in the two-dimensional piston pump,positive overlap designs have minimal influence on its mechanical efficiency,and positive overlap within 2° have negligible effects on chamber pressure,eliminating concerns regarding trapped oil effects while effectively addressing the issue of internal leakage.
two-dimensional piston pumpmechanical efficiency modelpositive overlap designexperimental study
万方数据
维普
