Bosch Rexroth | A10VSO28DFR131R-VPA12N00
A10VSO28DFR1/31R-VPA12N00
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The A10VSO28DFR1/31R-VPA12N00 variable pump is produced by Bosch Rexroth as part of the A10VSO Variable Pumps series and converts rotational drive power into regulated hydraulic flow for automation circuits. It displaces 28 cm³ of oil per revolution, so the moved volume per turn is fixed for precise flow calculation. The shaft turns clockwise, a requirement that determines motor orientation and piping layout. A permitted speed of 3000 rpm at maximum displacement establishes the upper mechanical limit for continuous operation. At that speed the pump can deliver 84 L/min, giving designers a reference for peak circuit flow. Continuous work is supported at 280 bar nominal pressure, while short-term loading up to 350 bar allows reserve for transient spikes. A power demand of 39 kW at 280 bar identifies the drive motor rating needed to run the unit at full load. The drive shaft must also withstand 125 N·m of torque under the same pressure, defining coupling strength. A rotating inertia of 0.0017 kg·m² keeps acceleration requirements modest and aids rapid response in servo-controlled systems.
The internal case volume of 0.7 L provides space for splash lubrication and thermal expansion of the working fluid. Case drain pressure is limited to 2 bar, so the return line must stay low-pressure to protect shaft seals. Oil leaves the housing through a 3/4-16 UNF drain port, simplifying connection to common fittings. Pilot control is accessed by a 7/16-20 UNF port, enabling external pressure signals to adjust the pump. High-pressure output exits the body through a 3/4-inch SAE 6162-1 port that matches standard flange hardware. Inlet flow enters through a 1 1/4-inch SAE 6162-1 suction port and is restricted to 10 bar to avoid cavitation. These interface dimensions and limits guide hose selection and reservoir placement so the pump integrates correctly in hydraulic systems.
Technical Specifications
Case Volume
0.7 L
Direction Of Rotation
Clockwise
Displacement
28 cm³/rev
Drain Port Thread (l/l1)
3/4-16 UNF
Max Case Drain Pressure
2 bar
Max Flow (3000 Rpm)
84 L/min
Max Power (280 Bar)
39 kW
Max Speed (at Vg Max)
3000 rpm
Max Torque (280 Bar)
125 Nm
Maximum Pressure
350 bar
Moment Of Inertia (jtw)
0.0017 kg·m²
Nominal Pressure
280 bar
Pilot Port Thread (x)
7/16-20 UNF
Pressure Port Size (b)
3/4 in SAE 6162-1
Suction Port Max Pressure
10 bar
Suction Port Size (s)
1 1/4 in SAE 6162-1
1620 Old Apex Road
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