FIELD: soil or rock drilling; mining.;SUBSTANCE: invention relates to mining, namely, to downhole hydraulic motors. Volumetric downhole motor includes stator with semi-cylindrical blades attached to it, which form annular cavity, peripheral and side holes, rotor with flushing openings. In annular cavity of stator with marked gap between walls and endings there are circular channels with bottom directed from outer side of semi-cylindrical blades to inner surface of adjacent ones. Upper level of circular channels is located above peripheral and side holes. Rotor is equipped with hemisphere with cylindrical base, on surface of which grooves are made, diverging from top and along bent with bend through cylindrical base coaxially extending into inclined flushing workings of rotor, conically tapering by lower end of stator rotation, oriented to bottom of equal in cross section of circular channels.;EFFECT: increasing moment of engine rotation force and eliminating possibility of countercurrents appearance in annular cavity of stator.;1 cl, 3 dwg
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