HELICAL FACE MOTOR FOR CONTROLLED DIRECTIONAL DRILLING Russian patent published in 2000 - IPC

FIELD: gas and oil industry. SUBSTANCE: face motor includes motor section with stator, rotor and torsion bar and spindle section with output shaft having longitudinal conduit. Radial and thrust bearings are put on output shaft. Frames of motor and spindle sections are linked by curved adapter housing hinged joint coming in the form of two clutches with cylindrical bars. One clutch is made fast to lower end of torsion bar, second clutch is made fast to upper end of output shaft. Cylindrical bars of both clutches face one another. Helical grooves are made in outer surface of cylindrical bars of both clutches, butts of cylindrical bars have spherical and hemispherical recesses along longitudinal axis where thrust ball is placed, cylindrical spring is put into helical grooves. One end of spring is linked to clutch of lower end of torsion bar, second end of cylindrical spring is joined to upper end of output shaft. Longitudinal and radial conduits for connection of internal space of curved adapter to longitudinal conduit of output shaft are made inside clutch. EFFECT: increased service life of motor, simplified design of it, facilitated assembly and reduced friction losses. 5 cl, 3 dwg