A DRIVE MECHANISM FOR AN OIL-WELL SUCKER-ROD PUMP

摘要

A drive mechanism for an oil-well sucker-rod pump comprising a motor having an output shaft thereof cinematically linked with rods through a transmission mechanism converting a rotary motion into a translational motion, characterized in that the transmission mechanism has the form of a crank provided with counter-weights, and a gear train fashioned as a stationary gear wheel with internal teeth and two movable gear wheels of large and small diameters meshing with the stationary gear wheel and mounted for rotation on shaft secured at the ends of the crank, the pitch circle diameter of the stationary gear wheel being equal to a drive stroke, whereas the pitch circle diameter of the larger movable gear wheel amounts to one-half the drive stroke this, latter gear wheel having a cantilever-arranged pin pivotably connected to the rods the center of the pin being disposed on the pitch circle of this gear wheel; a shaft being further arranged coaxially with the stationary gear wheel, one end of which shaft being connected by way of a transmission to the output shaft of the motor, the other end thereof being journalled for rotation in the crank, the shaft of the smaller movable gear wheel being cinematically linked with the shaft journalled in the crank.