Drive for deep-well sucker-rod pumping unit

Abstract

A sucker-rod pumping unit for fluid withdrawal is disclosed which relates to the oil producing industry and may be used in other industrial and agricultural sectors. The objective of the invention is to provide an improvement of kinematics to extend the range of use of a drive for the deep-well sucker-rod pumping unit. The drive comprises an electric motor coupled through a central gearbox to differentials comprising pinions and wheels, each differential having an output shaft and a housing fixedly coupled to a crownwheel. The housing of each differential, which is fixedly coupled to the crownwheel, is coupled through a crank to a pitman arm. In the meantime, the pitman arms coupled to the cranks fixedly coupled to the crownwheels are coupled through yokes to an equalizer on a walking beam, or the pinions of the differentials engage the output shaft of the central gearbox.

What is claimed is: 
     
         1 . A drive for a deep-well sucker-rod pumping unit, the drive comprising:
 an electric motor coupled through a central gearbox to differentials, comprising pinions and wheels,   each differential having an output shaft and a housing fixedly coupled to a crownwheel, wherein   the drive is characterized in that the housing of each differential, which is fixedly coupled to the crownwheel, is coupled through a crank to a pitman arm.   
     
     
         2 . The drive for the deep-well sucker-rod pumping unit according to  claim 1 , wherein the pitman arms coupled to the cranks fixedly coupled to the crownwheels are coupled through yokes to an equalizer on a walking beam. 
     
     
         3 . The drive for the deep-well sucker-rod pumping unit according to  claim 1 , wherein the pinions of the differentials engage the output shaft of the central gearbox.