Rexroth series A4VG180/28 Charge pump
5 month ago
Product details
I. Key Specifications and Performance
1. Model and Pressure Ratings
• A4VG180: A high-pressure closed-circuit axial piston variable pump from Rexroth’s A4VG series, with anominal pressure of 400 barand amaximum pressure of 450 bar, suitable for heavy-duty applications.
• A4VG28: A low-pressure variant in the same series, with anominal pressure of 300 barand amaximum pressure of 350 bar, ideal for light-load or auxiliary circuits.
2. Displacement and Flow Rate
• A4VG180: Displacement of180 mL/rev, with flow rate proportional to rotational speed (e.g., ~450 L/min at 2,500 rpm).
• A4VG28: Displacement of28 mL/rev, providing lower flow rates for auxiliary functions like charge oil supply or lubrication.
3. Control Methods
• Supportsvariable displacement control, enabling infinite adjustment of displacement via swashplate angle modulation to meet dynamic system demands.
• Optional accessories includepressure compensators and flow control valvesto enhance response speed and stability.
II. Structural and Design Features
1. Closed-Circuit Design
• Optimized for closed-loop hydraulic systems (e.g., travel drives in construction machinery), where acharge pumpmaintains circuit pressure balance to prevent cavitation and overheating.
• Charge Pump Functionality: The A4VG series often integrates a charge pump (e.g., a small gear pump or embedded charge circuit in A4VG180) to supply low-pressure oil for leakage compensation and oil cooling.
2. High Power Density and Reliability
• Adopts aswashplate-type axial piston structure, offering compact design and high power density for space-constrained installations.
• Critical components (pistons, swashplate, bearings) are made of high-strength materials with specialized heat treatment, ensuring a service life exceeding10,000 hours.
3. Low Noise and High Efficiency
• Optimized flow path design reduces pressure pulsation, lowering noise levels by3–5 dB(A)compared to competitors.
• Volumetric efficiency exceeds95%, minimizing energy consumption and aligning with energy-saving trends.
III. Typical Applications
1. Construction Machinery
• Concrete Pump Trucks: A4VG180 serves as the main pump for hydraulic cylinders in concrete delivery, with the charge pump stabilizing closed-loop pressure.
• Excavators: Used in travel drives to provide high torque for navigating complex terrains.
• Cranes: Enables precise control in luffing and slewing mechanisms.
2. Industrial Equipment
• Die-Casting Machines: Supplies high-pressure oil for mold opening/closing and product ejection.
• Marine Deck Machinery: Powers winches and anchor windlasses in corrosion-resistant designs for offshore environments.
3. Specialized Applications
• Test Benches: Provides stable high-pressure oil for hydraulic component testing.
• Renewable Energy: Drives hydraulic cylinders in wind turbine pitch control systems for blade angle adjustment.
IV. Selection and Configuration Recommendations
1. Charge Pump Matching
• For systems requiring a standalone charge pump, select Rexroth’sA10VSO serieslow-pressure pumps (e.g., A10VSO28) to pair with the A4VG180 main pump.
• Confirm charge flow requirements (typically10–20% of main pump flow) to avoid circuit pressure fluctuations.
2. Control Method Selection
• Pressure Control (DR): Ideal for constant-pressure systems like hydraulic presses.
• Flow Control (FR): Suitable for precise speed control in CNC machines.
• Load-Sensing Control (LS): Optimizes energy efficiency in multi-pump parallel systems (e.g., excavator compound actions).
3. Installation and Maintenance
• Ensure oil cleanliness meetsNAS 1638 Class 9or higher to prevent piston wear.
• Regularly inspect charge pump pressure (typically set to10–20 bar) to avoid system suction issues.
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