PUMPING UNIT Russian patent published in 1997 - IPC

FIELD: drives of sucker-rod pumps in operation of oil wells. SUBSTANCE: pumping unit includes electric motor 2 with reduction gear 3, walking beam 4 with head 5 and offset crank mechanism; each crank of this mechanism has cavity "a" with holes 7. Geometric axis I-I is located at angle of about 6 deg to crank axis. Crank 6 is connected with connecting rod 7 by means of pin made in form of slider 9 with inclined surface "б" which is in contact with one inclined surface "в" of cavity. Slope of these surfaces is about 9 deg relative to slider axis "II-II" and is directed towards axis "III-III" of connecting rod. Pin is secured by means of taper pin 10 located in taper half-holes 11 and 12 made in surfaces opposite to contact surfaces of slider and crank. EFFECT: enhanced reliability. 3 dwg