Description Frame size 4, 5 Size 20 … 250 Component series 3X Maximum operating pressure 350 bar Maximum displacement 250.5 cm³ Features Fixed displacement Low operating noise Low flow pulsation High efficiency also at low speed and viscosity due to sealing gap compensation Suitable for broad viscosity and speed ranges All frame sizes and sizes can be combined with each other Can be combined with axial piston pumps, internal gear pumps and vane pumps Suitable for operation with HFC fluid (seal design “W”) Use: For fatigue-resistant drives with high power and high pressures with very large numbers of load cycles, e.g. plastics processing machines, automatable presses, casting machines and other applications with accumulator charging operation Product description Set-up Hydraulic pumps of type PGH.-3X are gap-compensated internal gear pumps with constant displacement. They basically comprise of: Mounting flange (1), housing (2), cover with through-drive (3), pinion shaft (4), internal gear (5), plain bearings (6), axial washers (7) and stop pin (8) as well as the radial compensation consisting of segment (9), segment support (10) and the seal rolls (11). Suction and displacement procedure The hydrodynamically mounted pinion shaft (4) drives the internally geared internal gear (5) in the direction of rotation shown. The tooth clearances opening in the suction range suck in the fluid. The fluid is transported into the tooth clearances of pinion and internal gear, from the suction range (S) into the pressure range (P). There, the fluid is displaced from the closing tooth clearances and delivered into the pressure port (P). Suction and pressure range are separated by the radial compensation elements (9 to 11) and the tooth engagement between internal gear and pinion shaft. Axial compensation The displacement area in the pressure range is axially sealed by axial washers (7). To the sides of the axial washers facing away from the displacement area a pressure field (12) is applied. These fields balance the axial washers vis-à-vis the displacement area, which results in a perfect sealing with low mechanical losses. Radial compensation The radial compensation elements consist of segment (9), segment support (10) and seal rolls (11). Segment (9) and segment support (10) are arranged in the pressure field so that the resulting compressive force is basically accepted by the stop pin. A small compressive force component presses segment and segment support onto the tooth tips of pinion shaft and internal gear and in this way provides for the sealing of the pressure range to the suction range with automatic clearance adjustment. This is the prerequisite for constantly high volumetric efficiency during the entire operating time. The clearance adjustment of segment and segment support is made possible by the seal rolls located inbetween. Hydrodynamic and hydrostatic mounting The pinion shaft (4) is accepted by hydrodynamically lubricated radial plain bearings (6).
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