| The rotating component is one of the important components of the dual-drive axial piston motor.Its structural parameters and fatigue characteristics are the key factors affecting the balance and reliability of the dual-drive axial piston motor.However,the research on the rotation component of dual drive motor is not in-depth,so it has a certain potential of optimization and improvement.Therefore,paper takes the dual-drive axial piston motor as the research object to deeply explore the related characteristics of its rotating components.The main research contents of this paper are as follows:(1)The research status and development of fatigue analysis methods for axial piston motors are introduced,the key points and difficulties of the dual-drive motor in this paper and the feasibility of the method are analyzed the source of the topic is summarized,the main research objectives and contents of this paper are put forward.(2)The mathematical model of the torque of the double-drive motor’s cylinder body was deduced.The influence of plunger number,staggered angle,inlet pressure and inclination angle of swash plate on the cylinder torque was discussed by numerical solution of MATLAB.The results show that the output torque generated by the inner and outer row plunger of the dual-drive motor can be superimposed and increased,and the overturning torque of the cylinder can be superimposed and offset each other.Reasonable design of plunger number,staggered angle,pressure ratio and swashplate angle ratio can optimize the balance of dual-drive motor.(3)The cylinder model of the double drive motor was established,and the mechanical analysis and fatigue characteristic analysis were completed by using finite element software.The results show that the main stress-strain position of the cylinder block of the double-drive motor is at the hole and the port window.With the increase of the oil inlet pressure,the fatigue life of the cylinder block shows a nonlinear decreasing trend,while the fatigue damage shows a nonlinear increasing trend.(4)The model of plunger slipper assembly was established,and its transient dynamics simulation and fatigue characteristics were analyzed.The influence of oil inlet pressure on the stress and strain of plunger-slipper assembly is analyzed.The results show that the main stress of the plunger is concentrated in the neck position,and the main equivalent stress of the slipper is concentrated in the bottom of the slipper and the ball and socket.The fatigue damage of plunger-slipper assembly mainly occurs in the stress concentration area.The fatigue life of the plunger dangerous node is 1.296×108 cycles,and the fatigue life of the slipper dangerous node is 6.259×109 cycles.(5)Based on the research of rotor dynamics,the lumped model of dual-drive motor rotor system is established,the mass,polar moment of inertia and diameter moment of inertia of each node were calculate.Prohl and Riccati transfer matrix method were used to calculate the first three order critical speeds.The results show that the increase of bearing support stiffness increases,and the increase of critical speed of the dual-drive motor decreases gradually.When the support stiffness reaches a certain value,the critical speed of the dual-drive motor tends to remain unchanged.Figure 68 table 17 reference 98... |
