Cylinder piston arrangement for a fluid pump or a fluid motor

A cylinder piston arrangement for a volumetrically operating fluid pump or a fluid engine, comprising:

• at least one axially expanding tube diaphragm piston confining at least one internal, axially pulsating working chamber, wherein said pulsating working chamber directs fluid inward through an inlet and outward through an outlet;
• a housing borehole acting as a cylinder, said housing borehole configured to inhibit radial expansion of the tube diaphragm piston when directing fluid outward through the outlet;
• at least one axially extending clearance volume displacer provided within the pulsating working chamber and intruding into the pulsating working chamber, said clearance volume displacer configured to substantially reduce clearance volume within the pulsating working chamber;
• wherein between said housing borehole and said at least one axially extending clearance volume displacer a downwardly extending hollow cylinder section of the axially expanding tube diaphragm piston is axially slidably supported, corresponding to the expansion of the axially expanding tube diaphragm piston, in said housing borehole.