A new test method for simulating wear failure of hydraulic pump slipper pair under high-speed and high-pressure conditions

Abstract

In practical engineering, it is very difficult to obtain data on the slipper wear of hydraulic pumps, especially under high-speed, high-pressure conditions, which limits the development of fault diagnosis technology for hydraulic pumps. At present, a test method that can accurately simulate the operating state of the slipper pair under high-speed and high-pressure conditions does not exist. The reliable load-bearing design of the slipper pair is difficult to carry out effectivetest verification, which limits the development of high-speed and high-pressure piston pumps. Therefore, an experimental design method was proposed to directly simulate the high-speed, high-pressure friction state of the slipper pair based on the change law of reprinting residual pressing force.

Impact Analysis of Worn Surface Morphology on Adaptive Friction Characteristics of the Slipper Pair in Hydraulic Pump

“…During the experiment, the hydraulic cylinder presses the lower test sample against the upper test sample through the residual pressing force, and the upper test sample rotates at high speed under the action of the servo motor to simulate the friction state of the slipper. The hydraulic system is used as a constant pressure oil source to provide continuous pressure oil to the test sample through the fixed damping holes of the lower test piece, forming a central oil chamber between the upper and lower test samples to produce a lubricating oil film, which ultimately simulates the high speed and heavy load lubrication conditions of the slipper pair [ 36 ]. A liquid thermometer is installed in the pump station to monitor the oil temperature in real time.…”

A Method for Mathematical Modeling of Hydrodynamic Friction of Plunger Pairs with Consideration of Microgeometry

“…backs related to numerical instability in solving the system of algebraic equations derived from Equation (5). Additionally, the obtained calculation results depend on the values of β, especially at high eccentricities typical for heavily loaded bearings in thermal engines.…”

“…From the analysis of information sources, it is known that the Elrod algorithm and similar mass conservation algorithms for lubricant in the bearing lubrication film have drawbacks related to numerical instability in solving the system of algebraic equations derived from Equation (5). Additionally, the obtained calculation results depend on the values of β, especially at high eccentricities typical for heavily loaded bearings in thermal engines.…”

“…The second significant factor affecting the efficiency of hydraulic plunger pairs is mechanical damage, such as wear of mating surfaces, sticking, and plunger misalignment [3][4][5].…”

Analysis of Slipper Overturning and Collision Behavior of the Axial Piston Pump Based on Rigid-Flexible Coupling

“…The axial piston pump is a typical positive-displacement hydraulic machine that relies on the relative motion of various internal components [4,5] to complete the flow distribution action. Its high-pressure and high-speed operation [6,7] is beneficial for improving volumetric efficiency, but it also leads to poor internal friction conditions [8], in particular, as an intermediate link connecting the piston and swash plate [9], the force of slipper is extremely complicated. Under the complex and variable working conditions of the piston pump, the slipper is prone to overturning behavior, and it had a strong collision with its coupling [10,11], which led to the failure of the slipper to form a stable oil film lubrication.…”