Patent ID: 8142170

Claim:
A radial piston pump having an external loading and having an inner eccentric ( 7 ) which is attached to a rotatable driveshaft ( 2 ), having a cylinder block ( 3 ) which has positionally fixed cylinder bores ( 4 ) aligned radially with respect to the driveshaft ( 2 ), and having displacement pistons ( 5 ) which are mounted in a longitudinally movable manner in the cylinder bores ( 4 ), with each of the displacement pistons ( 5 ) having a piston head ( 8 ) with a short casing height, and being mounted with a piston base ( 12 ) on the eccentric ( 7 ), in such a way that the piston head ( 8 ), during a longitudinal movement, pivots in a predetermined angle range (Δα) about a longitudinal central axis ( 6 ) of an associated cylinder bore ( 4 ), and wherein the displacement pistons ( 5 ) are formed as a single piece including the piston head ( 8 ) and the piston base ( 12 ) and include a stepped inner bore ( 13 ) extending lengthwise through the displacement pistons ( 5 ) from the piston head ( 8 ) to the piston base ( 12 ) and a straight bore through the piston base ( 12 ) such that a metered quantity of a pressurized fluid passes from the cylinder bores ( 4 ) through the stepped inner bore ( 13 ) to a surface of the eccentric ( 7 ); and wherein the piston base ( 12 ) has a central recess ( 17 ) into which the straight bore opens out such that the displacement pistons ( 5 ) are supported on the eccentric ( 7 ) by a hydrostatic plain bearing arrangement formed in the central recess ( 17 ).