Design and analysis of the reversing device for extended-range pumping units
YUAN Xinmei
HUANG Jiawei
YANG Lizhao
HUANG Tiancheng
ZHOU Sizhu
Abstract：[Objective]To address the deficiencies in non-quick return and cyclic load adaptation of the reversing device for extended-range pumping units,a high-efficiency and reliable non-circular gear crank slider reversing device was developed.[Methods]The calculation of push and pull forces on the slider was conducted,along with motion analysis,and the optimal fastening angle between the crank and driven non-circular gear was determined.By employing dynamic simulation methods,the impact of the fastening angle between the crank and the driven eccentric non-circular gear as well as the eccentricity of the ellipse on the motion law of the reversing device was examined.Furthermore,finite element simulation methods were utilized to conduct the comprehensive analysis of contact stress on the tooth surface of the non-circular gear.[Results]The findings indicate that the upstroke movement of this reversing device is stable,and the downstroke time is relatively short,which is conducive to enhancing the stability and oil extraction efficiency of the pumping unit.In the meshing area where single tooth and double teeth of the non-circular gear pair alternate,the contact stress undergoes significant variations.The eccentricity and tooth width of the non-circular gear pair have a considerable influence on the distribution of the tooth surface contact stress and must be restricted.The research results can provide reference for the work efficiency and reliability improvement of extended-range pumping units.
Keywords：Extended-range pumping unitReversing deviceNon-circular gearCrank sliderDynamic simulation
Publication Date：2025-09-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 64-71 )