High-speed Axial Piston Pump Sliding Pair Auxiliary Fluid-solid Thermal Coupling Simulation And Material Friction Characteristics Analysis

Plunger pump is one of the core power components of hydraulic system,axial piston pump relies on plunger reciprocating movement in the cylinder block,so that the volume of the sealing working cavity changes to achieve oil absorption,pressure oil,is widely used in aerospace,agricultural machinery,construction machinery and other different fields.The piston pump used in the aviation field requires compact structure and small size,light weight and high speed,and the high speed of the aviation piston pump will inevitably bring some problems,such as overturning of rotating components,cavitation and friction wear between friction pairs.There are three major friction pairs in the axial piston pump,of which the movement of the sliding shoe pair is the most complicated,the sliding shoe pair is more likely to wear out in the highspeed operating condition,and the wear of the sliding shoe pair is likely to cause the pump wear failure.In order to select a more wear-resistant shoe pair material,this paper studies the friction and wear properties of the sliding shoe pair material from both simulation analysis and experiment,so as to provide a basis for selecting a more suitable shoe pair material,and the main research contents are as follows:The theoretical analysis of the slipper pair was carried out,and on this basis,the simulation model of the sliding shoe secondary flow field was established,and the pressure,temperature and velocity distribution of the sliding shoe auxiliary oil film were obtained,and then the finite element strength analysis was carried out,and the results showed that the deformation of 1Cr18Ni9 Ti was the smallest,but the stress was greater than that of several other materials,and the performance of Hmn60-3-1-0.75,ZY331608,ZQSn10-1 and QAl10-4-4 was preliminarily determined.More suitable as a material for sliding shoes.In order to further determine the wear of each material under high speed conditions,based on several sliding shoe materials determined by finite element strength analysis,a friction simulation model of sliding shoe pair was established,and the friction simulation of sliding shoe pair of different materials was carried out by using Workbench transient dynamics module,and the results showed that Hmn60-3-1-0.75,ZY331608 and ZQSn10-1 had less wear and deformation than QAl10-4-4 with the increase of speed,and were more suitable as sliding shoe materials.Through finite element strength analysis and friction simulation analysis,three sliding shoe materials can be determined,and the sliding shoe and swash plate of different materials are made into blocks and rings and paired for experiments,and the friction properties of slipper pairs of different paired materials are obtained.The friction coefficient,wear rate and surface wear morphology of the sliding shoe pair material were obtained through experiments,and the experimental results showed that the group with the smallest friction coefficient was when ZQSn10-1 and 40 Cr Ni Mo A were paired.The ZQSn10-1 has minimal wear when paired with 38 Cr Mo Al A;After observing the friction surface after the experiment,it can be seen that the most wearresistant sliding shoe material is ZY331608.When the swash plate material is40 Cr Ni Mo A,the sliding shoe material is tin bronze ZQSn10-1,which has better friction and wear resistance and is more suitable as a sliding shoe material.