A10VG45 Charge Pump
3 week ago
Product details
Rexroth Replacement A10vg45 A10vg63 Charge Pump
A4vg71 A4vg90 A4vg125 A4vg180 A4vg250 Hydraulic Charge Pump
Rexroth A4VG28 A4VG40 A4VG45 A4VG56 A4VG71 A4VG90 A4VG125 A4VG140 A4VG145 A4VG180 A4VG250
A4VTG71 A4VTG90
A10VG28 A10VG45 A10VG63
1. Product Overview
TheA10VG45 Hydraulic Charge Pumpis a dedicated component for closed-loop hydraulic systems, designed as a supplementary module for the Rexroth A10VG series axial piston variable pumps. Its primary function is to compensate for system leakage, maintain stable pressure in the main circuit, and cool hydraulic components. Typically integrated within the main pump or as a standalone unit, it is widely used in construction machinery, industrial vehicles, and metallurgical equipment under high-load conditions.
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2. Technical Specifications
【表格】
Parameter Typical Values for A10VG45 Charge Pump Notes
Displacement 45 cm³/rev (main pump)Charge pump: 5-15% of main pump displacement Charge pump displacement must ≥ total system leakage per minute.
Rated Pressure 28 MPa (charge pressure)Main pump: up to 420 bar Charge pressure should exceed return line backpressure by 10-20% of system working pressure.
Speed Range 600-2200 rpm Must match engine/motor speed to avoid cavitation or overheating.
Flow Rate ≈ Main pump displacement × speed × efficiency (typically 5-15 L/min) Insufficient flow causes pressure fluctuations; excess increases energy consumption.
Fluid Temperature -20°C to +80°C (standard seals)FKM seals required for high-temperature environments High temperatures accelerate oil oxidation; coolers may be needed.
Filtration NAS 6 (10-15 μm) Contaminants accelerate pump wear; full-flow filters recommended.
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3. Structure and Working Principle
Structural Features
• Axial Piston Design: Utilizes a swashplate-type piston mechanism for variable displacement (main pump function). The charge pump is typically a fixed-displacement gear or internal gear pump.
• Integrated Layout: Shares a common drive shaft with the main pump to reduce space requirements.
• Dual-Circuit Charging: Some models support bidirectional charging for reversible operations (e.g., excavator slewing motors).
Working Principle
1. Charging Phase: When pressure drops in the main pump’s closed loop due to leakage, the charge pump draws oil from the reservoir and injects it into the low-pressure side via check valves.
2. Pressure Maintenance: Charge pressure is limited by a relief valve to prevent system overpressure.
3. Cooling Function: A portion of the charge oil flows through a flushing valve to dissipate heat, extending component lifespan.
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4. Typical Applications
Construction Machinery
• Excavators: Provides stable pressure for slewing and travel motors, preventing juddering or crawling caused by leakage.
• Cranes: Ensures smooth operation of luffing and telescoping cylinders.
• Rollers: Maintains vibration motor pressure in closed loops to avoid force decay.
Industrial Vehicles
• Forklifts: Supplies pressure compensation for tilt and mast lift cylinders, improving control accuracy.
• AGVs: Stabilizes hydraulic circuit pressure in servo systems to reduce positional errors.
Metallurgical Equipment
• Rolling Mills: Provides continuous pressure for hydraulic screw-down systems to ensure uniform plate thickness.
• Continuous Casters: Prevents vibration failures in mold oscillation control due to oil leakage.
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5. Selection and Installation Guidelines
Selection Steps
1. Calculate Charge Flow:
Qcharge=∑Qleakage+Qcooling Q_{\text{charge}} = \sum Q_{\text{leakage}} + Q_{\text{cooling}} Qcharge=∑Qleakage+Qcooling
(Total leakage typically 1-3% of main pump flow)
2. Determine Charge Pressure:
Pcharge=Psystem×1.1∼1.2 P_{\text{charge}} = P_{\text{system}} \times 1.1 \sim 1.2 Pcharge=Psystem×1.1∼1.2
(Must exceed return backpressure by ≥0.5 MPa)
3. Match Drive Power:
Pdrive=Qcharge×Pcharge600×η P_{\text{drive}} = \frac{Q_{\text{charge}} \times P_{\text{charge}}}{600 \times \eta} Pdrive=600×ηQcharge×Pcharge
(η = total pump efficiency, typically 0.8-0.85)
Installation Notes
• Suction Height: Keep charge pump suction port ≤500 mm above reservoir liquid level to avoid cavitation.
• Piping Layout: Use short, straight charge lines with bend radii ≥3× pipe diameter to minimize pressure loss.
• Filter Configuration: Install coarse (100 μm) and fine (10 μm) filters at suction and return ports, respectively.
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6. Common Faults and Troubleshooting
【表格】
Symptom Possible Causes Solutions
Insufficient charge pressure Stuck relief valve, clogged suction filter Clean relief valve, replace filter
Flow fluctuations Loose drive shaft coupling, pump wear Tighten coupling, replace worn components
Pump overheating High oil viscosity, cooler failure Use oil with proper viscosity, repair cooler
Abnormal noise Air ingress, poor gear meshing Bleed air, check pump alignment
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