Abstract: A reduction unit includes a sun gear (2) which is integral with the driving shaft (1), and is equipped at the two ends of the shaft with two identical toothings (3, 4) which mesh with three free planetary gears (7) which in turn mesh with the fixed (10) and rotary (11) internal ring gears; between these ring gears there is a difference of three teeth.
Abstract: The walking beam of a pumping unit is suspended from an oscillating hanger arm. It is pivoted at one end to a crank and to a link, the other end of the latter being pivoted to a fixed position shaft. At the other end of the walking beam is a point which follows a virtually rectilinear path between a bottom dead center position and a top dead center position. This point may therefore be coupled through a rigid member to an oil well pump sucker rod line.