Rexroth hydraulic piston pump A10VSO71DFR/31R-PSC62K07

1. Model Interpretation

• A10VSO: Series identifier, representing variable displacement axial piston pump with swashplate design for open-circuit hydrostatic drives, which is widely used in industrial hydraulic systems and engineering machinery.
• 71: Nominal size, indicating the maximum geometric displacement per revolution is 71 cm³/rev.
• DFR: Control mode, standing for pressure and flow controller (DFR) without a small hole in the X oil circuit, realizing automatic flow adjustment through pressure feedback to ensure stable system operation.
• 31R: Mounting and rotation direction, 31 represents the 3rd generation and 1st version series specification, and R indicates clockwise rotation when viewed from the shaft end.
• PSC62K07: Control accessories; P stands for FKM shaft seal and keyed straight shaft (DIN 6885), S refers to solenoid proportional control, C62 indicates the standard proportional control module specification, and K07 represents the additional configuration of the control circuit to meet the requirements of medium-pressure working conditions.

2. Basic Information

• Product Brand: Rexroth (Bosch Rexroth AG)
• Pump Type: Variable displacement axial piston pump (hydraulic piston pump)
• Operating Circuit: Open circuit
• Structural Design: Swashplate design, with precision plunger and barrel assembly, ensuring high volumetric efficiency.
• Material: Cast iron (main body), high-strength alloy steel for plunger and shaft
• Common Material Number: Reference only, subject to actual delivery

3. Key Technical Parameters

3.1 Displacement

• Maximum Geometric Displacement per Revolution: 71 cm³/rev
• Minimum Displacement: 0 cm³/rev (stepless adjustable by swashplate, with adjustment range of 0-100%)

3.2 Pressure Parameters

• Nominal Pressure (pₙₒₘ): 280 bar (long-term stable working pressure)
• Maximum Pressure (pₘₐₓ): 350 bar (peak pressure, single operating duration shall not exceed 5 seconds, total operating duration shall not exceed 300 hours)
• Minimum Outlet Pressure: 10 bar (to prevent damage to the axial piston unit and ensure lubrication)
• Inlet Pressure (absolute): Minimum 0.8 bar (0.5 bar for cold start), Maximum 10 bar
• Maximum Case Drain Pressure: 2 bar (absolute), shall not exceed 0.5 bar higher than the inlet pressure at port S)
• Pressure Change Rate (RA): 16000 bar/s

3.3 Rotational Speed

• Maximum Rotational Speed at Maximum Displacement (nₙₒₘ): 2500 rpm
• Maximum Permissible Rotational Speed at Displacement < Maximum Displacement: 3000 rpm
• Standard Operating Rotational Speed: 1800 rpm (long-term continuous working speed)

3.4 Flow Rate

• Maximum Flow Rate at Nominal Speed (2500 rpm) and Maximum Displacement: 178 L/min (theoretical flow, affected by pressure, oil temperature and viscosity in actual operation)
• Flow Rate at 1800 rpm and Maximum Displacement: 128 L/min
• Minimum Flow Rate: 0 L/min (stepless adjustable, controlled by proportional solenoid)

3.5 Power and Torque

• Maximum Power at Nominal Pressure (280 bar), Nominal Speed (2500 rpm) and Maximum Displacement: 82 kW
• Power at Nominal Pressure (280 bar), 1800 rpm and Maximum Displacement: 59 kW
• Maximum Torque at Maximum Displacement and Nominal Pressure: 278 Nm

3.6 Oil Requirements

• Recommended Oil Type: Mineral oil, hydraulic fluid HF; synthetic hydraulic oil or biodegradable hydraulic oil are also applicable
• Operating Temperature Range: -20℃ to +80℃ (ambient temperature), up to +100℃ for short time
• Oil Viscosity: 10 – 1000 mm²/s (operating viscosity), 32 – 68 mm²/s (optimal viscosity)

4. Installation and Connection Parameters

• Mounting Flange: ISO 3019-2 (metric), 2-bolt (ISO 2-hole)
• Shaft End: ISO key mounting (keyed straight shaft, DIN 6885)
• Service Line Connections: B flange (metric), S flange (metric); pressure port B and suction port S are in opposite directions with SAE metric fixed screws
• Drain Ports: 2 drain ports, the internal leakage oil must be discharged to the oil tank through the highest drain port of the housing
• Through Drive: Without through drive
• Connector for Solenoids: With solenoid connector (matching PSC62 proportional control module)

5. Physical Parameters

• Sealing Material: FKM (standard), with NBR seal conforming to DIN ISO 1629
• Weight (approx.): 45 kg
• Paint/Coating: Without paint/top coat

6. Product Characteristics

• Low operating noise and long service life, with high precision plunger pair and wear-resistant materials ensuring stable performance.
• Controls with short response times, PSC62 proportional solenoid control enables precise flow adjustment, adapting to variable working conditions.
• Stepless flow adjustment by swashplate adjustment, with adjustable range of 0-100%, high control accuracy.
• Compact structure and high power-weight ratio, suitable for engineering machinery, heavy-duty hydraulic stations and other medium-high pressure application fields.
• The drive shaft can bear axial and radial loads, and the flange connection conforms to SAE metric standard, facilitating installation and replacement.

Note