Strength Analysis And Structural Optimization Of Axial Piston Variable Displacement Hydraulic Pump Based On ANSYS

The axial piston pump is featured by compact structure, high working pressure and easy to control the variable. These features make it more widely applied in mechanical engineering field. As China began work on the study of hydraulic technology at a comparatively late date, there are already certain gaps in design and manufacture of axial piston pump between China and the developed countries. With the rapid development of domestic industrial technology, the performance requirements on the axial piston pump are constantly improved. Therefore, the study on the working performance of axial piston pump parts and structural improvement is of great significance.The finite element analysis and structural optimization design of axial piston pump important parts are carried based on the finite element numerical technique and ANSYS analysis software in this thesis. Firstly, the working principle of flow distribution pairs, dynamic performance and fluid-structure coupling force condition under the rated condition of flow distribution pairs are analyzed in detail, and then, the force boundary condition of flow distribution pairs is obtained during dynamic at work. Subsequently, the finite element analysis of axial piston pumps key part——flow distribution pairs is carried based on the finite element numerical technique and ANSYS analysis software. The whole stress distributions of flow distribution pairs are derived under the rated condition and the stress nephogram, strain nephogram, deformation nephogram of flow distribution pairs are drawn, judging whether the structure of flow distribution pairs meet the requirements of allowable strength and biggest deformation by the results of finite element analysis and comparisons to the allowable mechanical performance parameters of flow distribution pairs. Meanwhile, the same method is applied to analyze the force condition of shell. The finite element strength analyses are also carried on the shell. The stress nephogram, strain nephogram, deformation nephogram, the first six order natural frequency and modal vibration mode of shell are obtained under the rated condition, judging whether the structure of shell meet the requirements of strength and deformation, etc.Finally, in order to meet the design requirements of lightweight in this thesis, the structural optimization designs of the cylinder and shell are carried by the Design Explorer module of ANSYS Workbench. Through the setting of input parameters and output parameters, a series of optimization design are calculated, and the influence of the relationship between input parameters and output parameters are obtained by the response surface. The optimal design schemes that could meet the lightweight design requirements are finally determined through the comprehensive consideration of the optimization goal and actual working condition. It is significant that the optimal schemes are conductive to improve the material utilization rate and reduce manufacturing cost.