The effect of increasing eccentricity and leakage on the performance of an axial piston pump

Abstract

An Axial Piston Pump (APPs), suitable for high pressure and high efficiency, is used as the source of fluid power in the hydraulic system. Due to the compact design and relative motion between various parts, it causes wear in parts thus leakage introduce between various moving parts which work under tight tolerance. Multiple faults in an axial piston pump occur simultaneously after a long time of operation due to harsh working conditions and heavy loads. Faults in the pump deteriorate the pump’s performance and limit the operating range of the pump. Estimation must account for random and uncertain characteristics, and accurate wear prediction is difficult. Effective diagnosis improves pump dependability and performance. An approach based on simulation is utilized to model the impact of faults like leakage through eccentricity in piston-cylinder arrangement with increasing severity of clearance between piston-cylinder arrangement and its effect on the pump performance. As the clearance with different eccentricity between the piston and cylinder arrangement increases, outlet pressure and discharge of the pump remains unaffected up to a critical value of severity. After further increasing severity, outlet pressure and discharge reduce monotonically and saturate at a single value in extremely severe conditions. With increasing the severity of eccentricity in the piston-cylinder arrangement and increasing the severity of clearance, a critical threshold value shifts to a lower magnitude.