Structural calculation and optimization of four-bar linkage pumping unit transmission mechanism

YANG Xia， SONG Jing， GUO Zhao， YU Bei
（School of Mechanical and Electrical Engineering， Wuhan Institute of Technology， Wuhan 430073， China）

Abstract： In order to improve the movement efficiency of the new pumping unit and realize the optimization structure of the transmission mechanism，modern design methods were used. Based on SolidWorks2010 design software，the initial entity structure model of the four-bar linkage transmission mechanism was established and its structure calculation and optimization were performed. The comparative analysis of the centroid coordinate changing with time was also given out. Before and after optimization，the datas which were the trajectory coordinate values of the center of mass changing over time were obtained and the X-axis，Y-axis coordinate of centroid relative to the fulcrum were also obtained. Finally，the optimization structure of the transmission mechanism was acquired. The results indicate that，after the optimized transmission mechanism，the maximum deviation of the X-axis coordinate values of the center of mass is reduced by about 85.87%，and the maximum deviation of the Y-axis coordinate values of the center of mass is reduced by about 92.42%. The transmission mechanism motion is relatively stable and thereby its energy consumption is reduced significantly.
Key words： four-bar linkage pumping unit； transmission mechanism； the center of mass trajectory； balance； optimization； SolidWorks