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1. Model Breakdown
• A4VG125:
• A4: Bosch Rexroth’s series code for axial piston variable-displacement pumps/motors, representing high-pressure, high-performance designs.
• V:Variable Displacement, enabling continuous adjustment of output flow/torque to match load demands.
• G: Typically denotesHigh-Pressure Rating, suitable for demanding industrial environments.
• 125: Nominal displacement of125 cm³/rev(actual displacement may vary slightly by configuration).
• Variable Displacement Swing:
• Variable Displacement: Adjusts pump/motor output by modifying the swashplate angle to vary piston stroke.
• Swing: Refers to the rotational (pivoting) motion of the swashplate, the core mechanism for displacement control.
2. Core Functions
• Stepless Displacement Adjustment:
• The swashplate angle ranges from0° to maximum, corresponding to displacement adjustments from0 to 125 cm³/rev.
• Applications: Matches load requirements (e.g., crane hoisting, excavator slewing) to avoid energy waste.
• Bidirectional Rotation:
• Operates as a pump or motor, supporting forward/reverse rotation for closed-loop hydraulic systems (e.g., drive systems, slewing mechanisms).
• High-Pressure Capability:
• Rated pressure:350 bar; peak pressure:400 bar, meeting heavy-duty industrial needs (e.g., die-casting machines, marine deck machinery).
3. Technical Structure
• Swashplate Swing Mechanism:
• The swashplate angle is controlled hydraulically or via electro-hydraulic proportional valves to adjust piston stroke and displacement.
• Control Methods:
• Hydraulic Control (HD): Regulates displacement using pilot pressure.
• Electro-Hydraulic Proportional Control (EP): Combines electronic signals for precision adjustment.
• Key Components:
• Piston Cylinder Block: Axially arranged pistons interact with the swashplate for oil suction/discharge.
• Valve Plate: Directs oil flow to ensure high volumetric efficiency.
• Charge Pump: Provides control pressure and system makeup oil to prevent cavitation.
• Efficient Design:
• Axial piston structure minimizes friction losses, achieving mechanical efficiency≥92%.
• Variable control reduces energy consumption under partial loads (e.g., low displacement during idling).
4. Typical Applications
• Construction Machinery:
• Excavator slewing drives, crane luffing mechanisms, concrete pump main pumps.
• Industrial Equipment:
• Injection molding machine hydraulic systems, die-casting machine clamping units, rubber calendering machines.
• Marine & Energy:
• Deck cranes, drilling platform hydraulic power units, wind turbine yaw systems.
5. Key Parameters (Standard Model Example)
【表格】
Parameter Typical Value
Nominal Displacement 125 cm³/rev
Rated Pressure 350 bar
Peak Pressure 400 bar
Max Speed 2,200 rpm (continuous) / 2,500 rpm (intermittent)
Control Method Hydraulic/Electro-Hydraulic Proportional (HD/EP)
Weight Approx. 85–120 kg (varies by configuration)
Fluid Temperature -30°C to +80°C (special versions support higher temps)
6. Performance Advantages
• Energy Efficiency:
• Adjusts displacement on demand, reducing wasted energy (e.g., lower displacement under light loads).
• Closed-loop control improves system efficiency by10%–15%.
• High Reliability:
• Durable bearings and seals withstand continuous heavy-duty operation.
• Integrated pressure cut-off valve prevents overload.
• Control Flexibility:
• Supports remote electronic control, local manual operation, or hybrid hydraulic control for diverse automation needs.
7. Operation & Maintenance
• Pre-Startup Checks:
• Verify fluid cleanliness (NAS 1638 ≤ Class 7) to avoid contamination-related failures.
• Check charge pump pressure (typically1.5–2.5 bar).
• Routine Maintenance:
• Replace filters every 500 hours; monitor fluid temperature (≤80°C).
• Inspect swashplate movement for smoothness and leaks.
• Troubleshooting:
• Insufficient Displacement: Check control valve pressure and swashplate angle sensor.
• Abnormal Noise: Investigate piston wear or valve plate damage.
8. Selection Guidelines
• Load Matching: Choose displacement based on system peak pressure and flow demands (e.g., 125 cm³/rev for medium-to-large equipment).
• Control Method:
• HDfor simple systems;EPfor automated applications.
• Environmental Adaptation: Select low-temperature start versions for high-altitude or extreme cold regions.
