A10VSO74DFLR Variable Displacement Axial Piston Pump

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Product details

1. Product Overview

TheA10VSO74DFLRis aswashplate-type axial variable-displacement piston pumpmanufactured byBosch Rexroth, designed foropen-circuit hydraulic systems. Its key feature isstepless displacement adjustmentvia swashplate angle modulation, enabling proportional flow and pressure control based on drive speed and displacement. It is widely used in industrial applications requiring precise flow/pressure regulation, such asmachine tools, injection molding machines, and presses.

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2. Model Breakdown (A10VSO74DFLR/31R-VSC46N00)

• A10VSO: Product series code for swashplate-type axial variable-displacement piston pumps (open-circuit).

• 74: Nominal displacement of74 cm³/rev(displacement per revolution).

• DFLR: Control mode code indicatingpressure/flow/power composite control, typically integrating electro-hydraulic proportional control for high-precision dynamic response.

• /31R:

• 31: Design variant code (may relate to specific pressure ratings or structural optimizations, e.g., rated pressure280 bar, peak pressure350 bar).

• R: Rotation direction (clockwisewhen viewed from the driveshaft end).

• -VSC46N00:

• VSC: Control type (e.g., electro-hydraulic proportional control with integrated sensors or electronics).

• 46: Software version or configuration code (e.g., calibration parameters or control logic revision).

• N00: Additional options (e.g., seal materials, special port configurations, or certification marks).

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3. Key Performance Parameters

• Rated Pressure: 280 bar (continuous operating pressure).

• Peak Pressure: 350 bar (transient maximum pressure).

• Displacement Range: 74 cm³/rev (fixed displacement; some variants support mechanical/hydraulic displacement adjustment).

• Speed Range:

• Maximum Speed: Typically ≤ 3,000 rpm (depends on viscosity and temperature).

• Minimum Speed: Avoid low-speed crawling (recommended ≥ 500 rpm for lubrication).

• Volumetric Efficiency: ≥ 95% (typical value, dependent on oil cleanliness and operating conditions).

• Control Response Time: Short (≤ 50 ms for electro-hydraulic proportional control).

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4. Structural and Design Features

• Swashplate-Type Axial Piston Design:

• Pistons reciprocate via slipper shoes contacting the swashplate; swashplate angle changes drive piston motion for suction/discharge.

• Port plate isolates suction and discharge chambers for sealing.

• High Power Density: Compact design with high output power per unit volume.

• Low Noise: Optimized flow path and port plate design reduce hydraulic shock and vibration.

• Long Service Life: Critical components (pistons, slipper shoes, bearings) use high-strength materials and surface treatments for wear resistance.

• Multiple Control Modes: Supports DR (constant pressure), DFR (pressure/flow), and DFLR (pressure/flow/power) for complex applications.

• Through-Drive Option: Available with a through-shaft for tandem pump configurations (e.g., multi-pump systems).

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5. Control Mode Details (DFLR)

DFLR control combinespressure, flow, and power regulationvia electro-hydraulic proportional valves:

• Pressure Control: Maintains constant system pressure (e.g., 200 bar; reduces displacement if pressure exceeds setpoint).

• Flow Control: Adjusts flow based on load demand (e.g., matches actuator speed changes).

• Power Control: Limits input power (e.g., prevents motor overload by regulating pressure × flow).

• Typical Applications: Injection molding clamping/injection, press holding, and CNC machine tool feeds.

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6. Installation and Operational Guidelines

• Hydraulic Fluid Requirements:

• Recommended:Mineral oil (ISO VG 46)or environmentally friendly fluids (e.g., HEE, HFDU). Avoid mixing fluid types.

• Operating viscosity range: 10–1,000 mm²/s (optimal: 16–36 mm²/s).

• Cleanliness: NAS 1638 Class 9 or ISO 4406 18/15 (filtration ≤ 10 μm).

• Suction Conditions:

• Ensure suction port pressure ≥ 0.8 bar (avoid cavitation). Use short, straight suction lines with minimal bends/restrictions.

• Case drain (L/L1) must return directly to the tank (pressure ≤ 2 bar absolute).

• Mounting Orientation:

• Horizontal or vertical installation allowed; avoid case drain port facing upward (prevent air trapping).

• Driveshaft can withstand axial/radial loads (verify bearing life).

• Temperature Control:

• Operating range: -25°C to +90°C (short-term allowance: 110°C).

• Avoid prolonged high-temperature operation (>80°C; derate if necessary).

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7. Common Faults and Troubleshooting

【表格】

Symptom Possible Causes Solutions

Insufficient flow Small swashplate angle, suction blockage, high internal leakage Adjust control signal, clean filters, replace seals

Pressure fluctuations Oil contamination, stuck control valve, cavitation Replace fluid, service control valve, improve suction conditions

Abnormal noise Bearing failure, port plate wear, cavitation Replace bearings, repair port plate, optimize suction

High case drain temp Restricted case drain, inadequate cooling Check drain lines, add cooler

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8. Application Examples

• Injection Molding Machines: DFLR control enablesclamping pressure holding(pressure control) andinjection speed matching(flow control) while limiting motor power (power control).

• Presses: Maintains constant pressure during holding phases and adjusts flow based on load to save energy.

• CNC Machine Tools: Dynamically matches feed axis loads for improved precision and efficiency.

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9. Selection Recommendations

• Forhigh-precision dynamic response(e.g., servo systems), prioritize DFLR or DFR control variants.

• Forconstant pressure only, choose DR variants to reduce costs.

• Verifydisplacement and pressure ratingsmatch system requirements (e.g., 74 cm³/rev for flow demand).

• Considerinstallation spaceandthrough-drive needs(for multi-pump setups).