HINGE DEVICE FOR SCREW DOWNHOLE MOTOR Russian patent published in 2006 - IPC E21B4/02 

FIELD: drilling equipment, particularly devices for kinematically connecting screw downhole motor with output spindle shaft.

SUBSTANCE: hinge device comprises half-coupling with blind axial orifice and through radial orifices, shaft with spherical end part installed in axial blind orifice of half-coupling so that the shaft may be circularly deflected through acute angle α°. Hinge device comprises bearing and pad having spherical support surfaces to cooperate with spherical shaft end, removable keys and sealing means made as nut with skirt. The device also comprises stop ring and collars. Hinge device has sliding bushes installed in radial half-coupling orifices. Removable keys are T-shaped and inserted in sliding bushes and in grooves formed in spherical shaft end and having flat sides to cooperate with flat sides of T-shaped removable keys.

EFFECT: increased load-bearing capacity, reliability and service life.

5 cl, 3 dwg