Mode of operation of Radial piston pumps The shaft

(1) transfers the drive torque to the star-shaped cylinder block

(3) free from any transverse forces via a cross-disc coupling

(2). The cylinder block is supported on the control journal

(4). The radial pistons

(5) in the cylinder block abut against the stroke ring

(7) through hydrostatically balanced slipper pads

(6). Piston and slipper pad are joined by a ball and socket joint which is locked by a ring. The slipper pads are guided in the stroke ring by two overlapping rings

(8) and, when running, are forced against the stroke ring by centrifugal force and oil pressure. As the cylinder block rotates, the pistons perform a reciprocating motion due to the eccentric position of the stroke ring, the piston stroke being twice the eccentricity. The eccentric position of the stroke ring can be altered by means of two diametrically opposed control pistons

(9, 10) in the pump body. The oil flow to and from the pump passes through ducts in the body and control journal and is controlled by the suction and delivery ports in the latter. The pressure forces generated inside the pump are absorbed by surfaces which are almost fully hydrostatically balanced. The rolling bearing supporting the drive shaft is subjected to external forces only.

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