FACE HYDRAULIC MOTOR Russian patent published in 1996 - IPC

FIELD: mining industry. SUBSTANCE: face hydraulic motor includes working sections connected in series intercoupled by members for distortion of motor axis manufactured from two coaxially placed drill pipes having following relation of lengths of drill pipes and of working sections 1/L=1/(R/r-1), where 1 is length of member for distortion of motor axis, cm, L is length of working section, cm; R is radius of arc of circumference described around distorted motor, cm; r is permissible radius of arc of bending of member for distortion of motor axis, cm satisfying condition r=Ed/2σ, where E is Young's modulus, kg/sq.cm; d is outer diameter of outer drill pipe in member for distortion of motor axis, cm; s - stress of yield point, kg/sq. cm. In this case ends of outer and inner drill pipes in member for distortion of motor axis are made fast to bodies and shafts of working sections correspondingly. EFFECT: improved efficiency in drilling inclined boreholes. 1 dwg