Drive for deep-well pumping unit

Abstract

The invention relates to the oil producing industry and, in particular, to a sucker-rod pumping unit for fluid withdrawal from a well, and may be used in other industrial and agricultural sectors. The objective of the invention is to simplify a design of a differential drive and to reduce costs at minimum pumping speeds of a pump jack. A drive for a deep-well sucker-rod pumping unit is disclosed. The drive comprises an electric motor coupled through a central gearbox to differentials comprising pinions and crown wheels, each differential having an output shaft coupled to a walking beam through a crank and a pitman arm. The invention is characterized in that the crown wheels of the differentials are fixed.

What is claimed is: 
     
         1 . A drive for a deep-well sucker-rod pumping unit, comprising an electric motor coupled through a central gearbox to differentials comprising pinions and crown wheels, each differential having an output shaft coupled to a walking beam through a crank and a pitman arm, and the crown wheels of the differentials being fixed.