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14
Description
The radial piston pumps are hydraulic pumps with variable displacement in combination with mechanical and
hydraulic compensators for pressure (p), flow (Q), combined pressure and flow control (p/Q) or horse power
control.
The shaft (1) transfers the drive torque to the star-shaped cylinder block (3), free of 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 act against the stroke ring (3) supported by hydrostatically balanced slipper pads (6).
Piston and slipper pads are joined by ball and socket joints which are locked by a ring. The slipper pads are
guided in the stroke ring by two retaining rings (8) and, when running, are held 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 positioning of the stroke ring, the piston stroke being twice the eccentricity. The rolling
bearing, supporting the drive shaft, is only subjected to external forces. The eccentric position of the stroke
ring is controlled by two diametrically opposed control pistons (9, 10) and the compensator (12). The pump
compensators mainly consist of housing, screws, spool, springs and seals and can be adjusted mechanically
(by hand or screws) or hydraulically. The oil flow to and from the pump passes through the pump ports and
into and out of the pistons through the porting in the control journal. The dimensions of the flanges for
suction port (13) and pressure port (14) differs for the different maximum pressure variants of radial piston
pumps (standard, maximum operating pressure 280 bar, high pressure 350 bar).
The hydraulic fluid, sucked by the pump is stored in a hydraulic tank (not a part of the pump). External
leakage of the pump or leakage of the safety valve (not a part of the pump) is connected via tubes or hoses
back to the hydraulic tank. Connection to ground by use of grounding clamp (11).
12
11
7
6
14
4
13
8
2
1
9
5
3
10
Figure 2: Cross section of the radial piston pump
All external parts of the radial piston pump and compensators are made of steel or cast iron except the shaft
seal and other hydraulic seals. Used sealing compound depends on the operating fluid.
The radial piston pumps are available with clockwise or counter clockwise rotation.
Usually used operating fluids are mineral oils. But it is also possible to use so called special fluids like
different emulsions (HFA, HFB, cutting emulsion), cutting oil, water glycol (HFC), synthetic esters (HFD),
Isocyanides and Polyol or Skydrol.
For more information about different options e.g. drive flanges and shafts, compensators or mounting:
Chap. 12.6 Supplemental Documentation
42
Benutzerinformation RKP für explosionsgefährdete Bereiche (CA57626 Version 2, 02/2016)
Moog GmbH
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