Model: A11VO40DRS/10R-VSC12K02
Type: Swashplate axial piston variable displacement pump (variable control type)
Manufacturer: Rexroth (Bosch Rexroth Group)
Core Functions:
• Provides high-pressure, large-flow power for hydraulic systems, supporting dual-variable regulation of pressure and flow.
• Suitable for closed-loop systems (e.g., construction machinery travel drives, crane slewing mechanisms).
II. Technical Specifications
【表格】
Parameter Specification
Nominal Displacement 40 cm³/rev (displacement per revolution)
Rated Pressure 350 bar (continuous operation); Peak pressure 400 bar (short-term)
Speed Range 600–2200 rpm (recommended economic range: 1500–1800 rpm)
Control Method VSC12K02: Electro-hydraulic proportional control (with pressure compensation and flow limitation)
Swashplate Angle ±12° (variable range, supports forward/reverse rotation)
Weight Approx. 25 kg (including housing and control valve)
Port Type SAE O-ring seal (high-pressure port: #16; low-pressure port: #12)
Cooling Method Built-in flushing valve (optional external circulation cooling)
III. Structure and Working Principle
1. Key Components:
• Piston Cylinder Block: 9 pistons evenly distributed, achieving displacement adjustment via swashplate oscillation.
• Variable Mechanism: VSC12K02 control valve regulates swashplate angle via proportional solenoids for stepless flow adjustment.
• Charge Pump: Built-in gear pump (displacement ~2.5 cm³/rev) provides make-up oil and cooling for closed-loop systems.
2. Control Logic:
• Input Signal: PWM current (4–20 mA or 0–10 V) controls proportional solenoids.
• Feedback Mechanism: Pressure sensors monitor system pressure and automatically adjust displacement to maintain setpoints.
3. Closed-Loop Characteristics:
• High-pressure and low-pressure circuits operate in a sealed cycle, reducing leakage and contamination risks.
• Requires配套 (must be used with) a charge pump, flushing valve, and high-pressure filter.
IV. Typical Applications
1. Construction Machinery:
• Excavator travel motor drives, crane slewing mechanisms, road roller vibration systems.
2. Industrial Equipment:
• Injection molding machine clamping units, metal die-casting machine hydraulic systems, ship steering gears.
3. Specialized Fields:
• Wind turbine yaw systems, shield tunneling machine cutter head drives (customized anti-contamination versions available).
V. Common Faults and Diagnosis
【表格】
Fault Symptom Possible Causes Solutions
Insufficient Flow Stuck swashplate, low charge pressure, worn pistons Clean variable mechanism, check charge pump pressure, replace piston set
Pressure Fluctuations Faulty proportional valve coil, control signal interference, oil contamination Test solenoid resistance, shield control lines, replace hydraulic oil/filter
Abnormal Noise Bearing failure, loose pistons, air ingestion Replace main bearings, tighten pistons, perform air bleeding
High Oil Temperature Inadequate cooling, excessive displacement, internal leakage Check flushing valve flow, adjust displacement settings, repair leaking components
VI. Maintenance and Upkeep Recommendations
1. Daily Inspections:
• Monitor oil temperature (recommended ≤80°C), pressure gauge readings, and charge pump pressure (normal 1.5–2.5 bar).
• Check oil level (via sight glass or oil gauge).
2. Periodic Maintenance:
• Every 500 hours: Replace hydraulic oil filters (precision ≤10 μm), inspect control wiring.
• Every 2000 hours: Replace hydraulic oil (recommended ISO VG46 anti-wear oil), clean variable mechanism.
3. Critical Component Lifespan:
• Piston set: ~8,000 hours (varies by operating conditions);
• Bearings: ~10,000 hours;
• Proportional valve: ~5,000 hours (requires periodic performance testing).
