Bosch Rexroth | AA10VSO28DRG31R-VPA12N00
AA10VSO28DRG/31R-VPA12N00
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The AA10VSO28DRG/31R-VPA12N00 axial piston unit belongs to the A10VSO Variable Pumps series from Bosch Rexroth and supplies variable flow for hydraulic automation loops. Its geometric displacement is 28 cm³ per revolution, establishing the volume transferred each shaft turn. At 1,800 rpm the pump outputs 50 L/min, while a nominal pressure of 280 bar supports continuous duty in medium-pressure circuits. A 350 bar peak pressure margin absorbs transient load spikes without damage. The rotating assembly withstands speeds up to 3,600 rpm, letting compact power packs pair it with high-speed motors. A 0.7 L case volume stores leakage oil for bearing lubrication, and a moment of inertia of 0.0017 kg·m² keeps drive acceleration forces low.
The pump attains 84 L/min maximum flow at its nominal speed, delivering fast actuator motion when full displacement is commanded. With a 280 bar load it transfers 39 kW, and the shaft must transmit 125 Nm of torque, guiding motor sizing. When displacement is limited the allowable speed is 3,000 rpm to preserve inlet conditions. The DRG control circuit needs a 20 bar differential pressure to adjust the swashplate and regulate output. Ports follow standard fittings for easy installation: the drain port is threaded 3/4-16 UNF-2B, pilot port X uses 7/16-20 UNF-2B, pressure port B accepts an SAE J518 3/4-inch flange, and suction port S matches an SAE J518 1 1/4-inch flange.
Technical Specifications
Case Volume
0.7 L
Drain Port Thread (l/l1)
3/4-16 UNF-2B
Drg Differential Pressure
20 bar
Flow At 1800 Rpm
50 L/min
Geometric Displacement
28 cm³/rev
Max Flow At Nnom
84 L/min
Max Permissible Speed
3600 rpm
Max Power At Nnom (280 Bar)
39 kW
Max Speed (vg Max)
3000 rpm
Max Torque At 280 Bar
125 Nm
Moment Of Inertia
0.0017 kg·m²
Nominal Pressure
280 bar
Peak Pressure
350 bar
Pilot Port X Thread
7/16-20 UNF-2B
Pressure Port B Size
SAE J518 3/4 in
Suction Port S Size
SAE J518 1 1/4 in
1620 Old Apex Road
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