DOWNHOLE ROD PUMP DRIVE Russian patent published in 2013 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: pump drive comprises frame, counterweights, and motor. Synchronizer wheel guide bearings are fitted at frame upper part. Synchronizer wheel has inner semi-rim to engage with one of two gears fitted on shafts running in frame upper bearings. Pulley elastically coupled with counterweights is fitted on the shaft. Two gears of the shafts are engaged with double-sided rack engaged with the pump rod string plunger. Synchronizer wheel has rim to engage with gear fitted on shaft running in bearings fitted under upper bearings. Shaft is engaged with gearbox output shaft. Gearbox input shaft is engaged with motor.

EFFECT: better operating performances, decreased weight and overall dimensions.

6 dwg, 3 cl