the closing element 11 the damping of the flow of hydraulic fluid can meet specific requirements by adjusting the difference between the external diameter of the end portion 12 and the diameter of the blind end bore 10 damping requirements can also be met by varying the size of the damping gap existing between the front side 13 and the bottom 15 of the blind end bore this may for example be carried out by placing shim plates between the cylinder block 1 and the abutment surface 25 of the head shaped portion of the closing element 11 fig2 is a cross section illustration of a radial piston pump including a cylinder block 1 in which the housing 32 of an electric motor not shown in the drawing is accommodated whose driven shaft is furnished with an eccentric 33 serving to drive the power pistons 34 power pistons 34 are supported on the eccentric 33 through a roller bearing 35 the return stroke is assured by a coupling ring 36 through which the two power pistons are connected to each other with separate axial extensions the coupling ring engages a circular groove positioned on each power piston 34 the pump receives hydraulic fluid through the suction side.