In order to adapt to the needs of different loads,the axial piston motor needs to be continuously converted between high and low speed when working,and the impact force generated in the process of high and low speed conversion may cause a series of prob-lems such as sliding boots falling off,plunger stuck and pressure disc breaking,so it is necessary to analyze the variable speed charac-teristics of the motor.Based on an axial piston motor used in a 5.0×105 N excavator,the hydraulic control model of the piston motor was built using AMESim software.The step signal was used to simulate the variable speed process,and the pressure change rule in the plung-er cavity during the angle change of the swash plate was studied.The variation of pressure in the plunger chamber was analyzed from the two aspects of changing the frequency of swash plate conversion and different response time of the plunger boot assembly.The stress and strain of the plunger under different pressures were analyzed also.The results show that the optimal response time of the plunger shoe as-sembly is 0.17 s,and the swash plate conversion frequency has little effect on the pressure of the plunger chamber when the response time is greater than 0.17 s.One of the main reasons for plunger stuck in cylinder hole is that the response time is too fast during high and low speed conversion.
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