PUMPING UNIT Russian patent published in 2014 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump engineering and can be used in borehole pumps designed to extract oil, water and other fluids from wells. Proposed pumping unit comprises frame, rack with rod string secured thereto. Said rack engages with the gear fitted on reduction gearbox output shaft composed by double reduction gearbox and simple three-link planetary mechanism operated in summing mode with permanent drive of pinion carrier "a" and variable drive to epicyclic gear "h". Counterweights have elastic linkage with either rack bottom end or drum secured at output shaft. Telescopic mechanism can be incorporated to increase pump working stroke.

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

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