The pump mechanism comprises disc-shaped housing (1) with through hole (2), inner surface of which (3) has shape of spherical belt, two shafts (4) positioned at an angle with respect to each other and directed inwards of said housing, and rotary-piston group mounted on shafts and located within of said through hole. Rotor (5) carries inside four chambers (6) and kinematically represents a cruciform. Chambers of said rotor are defined by two concave surfaces of rotating (7) and (8) that kinematically represent journals of articulated joints of two axles of cruciform (9) and (10) with shafts. Journal (7) belongs to axle (9) of cruciform and journal (8) belongs to axle (10). Two arc-shaped half-sleeves (11) and (12) of two articulated joints are located on the shafts perpendicular to their axles (one sleeve on each shaft) and represent doubled pistons of four chambers of said rotor. Capacity of chamber in direction of pistons’ movement is limited from the side, opposed to the piston, by surface of second doubled piston (13) that overlaps the said chamber in the lateral direction. During the shafts’ movement, each piston of the rotary-piston group is moving along the said chamber of the rotor, changing its capacity twice per revolution. Direction of forcing fluid through the said hole depends from the direction of rotation of shafts of rotary-piston group.
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