SCREW FACE ENGINE Russian patent published in 2004 - IPC

FIELD: drilling technologies.

SUBSTANCE: device has engine section including body with stator, rotor and upper sub, support assembly including body, sub, output shaft, connecting sub, joint and torsion bar. Sub has two connecting areas L1 and L2, area of lowered bending rigidity having length L, while thickness of sub walls in zone L is less than thickness of sub walls in zones L1 and L2. During engine operation in curved well portion due to bending rigidity being less than at outer elements of construction, connecting sub will bend and provide for favorable conditions of operation for rotor-stator engine section pair and radial and axial supports of spindle section.

EFFECT: higher durability.

4 cl, 4 dwg