FIELD: construction.
SUBSTANCE: invention comprises a hollow drive shaft, on which eccentric bushings are fixed with conical rollers, between which rings are installed on rolling bearings. At the same time elastic elements are installed between interacting surfaces of rings and rollers made as conical as responsive to each other. The rear end of the hollow drive shaft is connected with a hollow driving rod by means of a compensation coupling perceiving the axial load from a hollow driving rod at the hollow drive shaft with the possibility to vary an angle of inclination of the hollow drive shaft relative to the axis of the hollow driving rod. At the same time on the front end of the hollow drive shaft there is a cap of conical shape fixed with the possibility of its removal during withdrawal of the roller from a well.
EFFECT: increased durability and reliability of roller operation.
9 dwg
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