A4VG Series Hydraulic piston pump motor
3 week ago
Product details
1. Product Overview
TheA4VG Seriesis a high-pressure axial piston variable-displacement pump developed by Bosch Rexroth, typically integrated with a motor to form a hydraulic power unit. Its core function is to provide adjustable pressure and flow for hydraulic systems through a swashplate-type piston mechanism, driven by a motor.
Typical Applications:
• Construction Machinery: Excavators, cranes, concrete pump trucks
• Industrial Equipment: Injection molding machines, die-casting machines, metal rolling mills
• Agricultural Machinery: Combine harvesters, irrigation systems
• Marine & Offshore Engineering: Deck machinery, steering gear systems
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2. Core Technical Features
【表格】
Feature Description
Displacement Control Variable output via electro-hydraulic proportional control (DA, HD control), manual adjustment, or remote servo control
Pressure Rating Rated pressure: 350 bar; Peak pressure: Up to 400 bar (model-dependent)
Speed Range 500–2500 rpm (motor-driven, adaptable to different operating conditions)
Efficiency >95% volumetric efficiency, minimizing energy loss
Cooling Method Natural cooling or forced cooling (optional based on power rating)
Sealing Technology Dual-seal structure (shaft seal + face seal) to prevent leakage
Modular Design Supports direct coupling with various motors (asynchronous, permanent magnet synchronous), simplifying installation
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3. Key Performance Parameters
【表格】
Parameter Typical Values for A4VG 28/A4VG 56/A4VG 125
Displacement Range 28–125 cm³/rev (model-specific gradations)
Continuous Power 15–150 kW (after motor matching)
Maximum Flow 315 L/min (@1500 rpm, 125 cm³/rev model)
Weight 25–120 kg (excluding motor)
Noise Level ≤78 dB(A) (at 1-meter distance, full-load operation)
Lifespan >10,000 hours (maintenance-dependent)
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4. Motor Matching Guidelines
1. Power Matching:
• Motor power must be ≥1.1× the pump’s input power (accounting for startup surge and efficiency losses).
• Example: Pump requires 110 kW → Select a 132 kW motor.
2. Speed Synchronization:
• Motor rated speed must overlap with the pump’s allowable range (typically 500–2500 rpm).
• Variable-frequency motors enable wider speed adjustment (e.g., 200–3000 rpm).
3. Mounting Interface:
• Verify motor output shaft dimensions match pump input shaft (e.g., ISO 450 or SAE J-series flanges).
• Alignment tolerance: Axial deviation ≤0.1 mm, radial deviation ≤0.05 mm.
4. Protection Rating:
• Outdoor/harsh environments: Motor IP55 + Pump IP65 (dust/waterproof).
• Explosion-hazard zones: ATEX-certified motors required.
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5. Selection Steps
1. Define System Requirements:
• Maximum operating pressure (bar), flow rate (L/min), power (kW).
• Load type (constant/fluctuating), daily runtime.
2. Select Pump Model:
• Use the displacement formula:Q=V×n×ηv1000 Q = \frac{V \times n \times \eta_v}{1000} Q=1000V×n×ηv
(Q Q Q=flow,V V V=displacement,n n n=speed,ηv \eta_v ηv=volumetric efficiency≈0.95).
• Example: For 200 L/min flow → Select A4VG 90 (theoretical flow 213 L/min @1500 rpm).
3. Match Motor:
• Calculate input power:Pin=P×Q600×η P_{in} = \frac{P \times Q}{600 \times \eta} Pin=600×ηP×Q
(P P P=pressure,Q Q Q=flow,η \eta η=total efficiency≈0.9).
• Example: At 300 bar pressure requiring 200 L/min → Input power ≈111 kW → Select a 132 kW motor.
4. Verify Control Mode:
• Open-loop: DA control (pressure compensation).
• Closed-loop: HD control (dual flow/pressure feedback).
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6. Maintenance & Fault Diagnosis
• Daily Checks:
• Oil level (every 500 hours), oil temperature (≤80°C), abnormal noise.
• Leakage inspection (shaft seals, face seals).
• Scheduled Maintenance:
• Replace hydraulic oil every 2000 hours (ISO VG46 anti-wear oil recommended).
• Inspect bearings and swashplate every 5000 hours.
• Common Faults:【表格】
Symptom Possible Causes Solutions
Insufficient flow Swashplate jamming, control failure Clean variable piston, replace control valve
Pressure fluctuation Clogged suction filter, air ingestion Replace filter, check seals
Motor overheating Excessive pump load, misalignment Adjust displacement, realign components
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7. Typical Application Cases
• Excavator Hydraulic System:
A4VG 90 pump + 110 kW motor for composite motion control (boom, arm, bucket), achieving 15% energy savings.
• Injection Molding Machine Clamping Unit:
A4VG 56 pump + 75 kW servo motor for pressure closed-loop control, improving part repeatability to ±0.1%.
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
3 year
Main Product:
hydraulic motor,
gear box,
hydraulic pump,
hydraulic valve ,
hydraulic winch,
hydraulic system
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