DOWNHOLE PUMP DRIVE Russian patent published in 2011 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: downhole pump drive includes annular housing inside which there arranged is pinion and gear wheel, which have cylindrical projections having longitudinal slots. Convex and concave gear rims with sleeves have longitudinal slots on free cylindrical surfaces. On the drum flange there installed with possibility of radial movement is the slide which is provided with a pin installed in longitudinal slot, e.g. sleeve of concave gear rim. There are concave and convex stops of sleeves of gear rims, as well as arc-shaped stops of pinion and gear wheel. Each cylindrical protrusion of pinion and gear wheel has the diametre equal to the sum of distance between opposite lying cylindrical surfaces of sleeves of concave and convex gear rims plus doubled height of longitudinal sleeve slot. Also, each cylindrical protrusion of pinion and gear wheel is located between free sleeve end and arc-shaped stops. Flat ends of concave, convex and arc-shaped stops are perpendicular to the circle of these stops. Some ends of concave and convex stops are located in the plane passing along the axis of housing and pinion and other ends of these stops are located in the plane passing along the axis of housing and gear wheel. Ends of arc-shaped stops of pinion and gear wheel are located in the appropriate planes passing along the axis of the housing and pinion and along the axes of housing and gear wheel.

EFFECT: service life of downhole pump drive is enlarged.

4 dwg