1. Product Overview
TheK3V112DTPis anelectronically controlled axial piston variable-displacement hydraulic pumpfeaturing a swashplate design. It enables precise displacement adjustment via electronic signals, dynamically controlling flow and pressure in hydraulic systems. Designed for high-pressure, large-flow, and rapid-response applications, it is widely used in construction machinery, industrial equipment, and specialized vehicles.
Key Advantages:
• Electronic displacement control: Supports proportional solenoid or CAN bus control with rapid response (≤50ms).
• High-pressure output: Rated pressure of 35 MPa (5,075 psi), peak pressure up to 40 MPa (5,800 psi).
• High efficiency: Volumetric efficiency ≥93%, total efficiency ≥88%.
• Energy-saving design: Automatically adjusts displacement based on load demand to reduce energy consumption.
• High reliability: Critical components (e.g., pistons, valve plates) use high-strength alloys for wear and corrosion resistance.
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2. Core Functions
• Electronic Displacement Control:
• Adjusts swashplate angle via proportional solenoid valves or electronic control units (ECUs) to regulate piston stroke and output flow.
• Supports multiple control modes: constant power, constant pressure, and load-sensing (LS) control.
• Bidirectional Rotation:
• Enables forward/reverse output by reversing motor rotation or using built-in directional valves (requires bidirectional variable mechanism).
• Self-Priming Capability:
• Some models offer self-priming (configuration-dependent), eliminating the need for an additional charge pump.
• Overload Protection:
• Integrated pressure cutoff valve limits system pressure when exceeding preset values to prevent equipment damage.
• Condition Monitoring:
• Optional pressure, temperature, or flow sensors provide real-time operational data to the control system.
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3. Technical Specifications (Typical Values)
【表格】
Parameter K3V112DTP Specifications
Displacement 112 cm³/rev (variable range: 56–112 cm³/rev)
Rated Pressure 35 MPa (5,075 psi)
Peak Pressure 40 MPa (5,800 psi)
Speed Range 600–2,200 rpm (dependent on drive power)
Flow Range 67.2–246.4 L/min (@112 cm³/rev, 600–2,200 rpm)
Drive Power ≤110 kW (@35 MPa, 2,200 rpm)
Weight Approx. 85–95 kg (including electronic controller)
Port Sizes Inlet: G1 1/2; Outlet: G2 (BSPP)
Noise Level ≤80 dB(A) (at 1 m distance)
Protection Rating IP67 (dust/waterproof)
Control Signal Proportional solenoid: 4–20 mA or 0–10 V; CAN bus (optional)
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4. Structure and Working Principle
Key Components:
1. Cylinder Block:
• Contains multiple piston bores and rotates coaxially with the driveshaft.
2. Pistons:
• Precision steel pistons with slippers that contact the swashplate.
3. Swashplate:
• Fixed or variable-angle plate adjusted electronically to modify piston stroke.
4. Valve Plate:
• Distributes inlet/outlet ports for oil suction and discharge.
5. Displacement Control Mechanism:
• Proportional valves drive hydraulic pistons to adjust swashplate angle.
6. Bearings and Seals:
• High-load roller bearings support the driveshaft; dual-lip seals prevent leakage.
Working Principle:
1. Suction Phase:
• Pistons retract, increasing cylinder bore volume. Hydraulic oil enters through the valve plate inlet.
2. Discharge Phase:
• Pistons advance, reducing cylinder bore volume. High-pressure oil exits through the valve plate outlet.
3. Variable Control:
• The electronic controller receives external signals (e.g., pressure, flow demand) and drives proportional valves to adjust swashplate angle, regulating displacement.
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5. Applications
• Construction Machinery:
• Excavators (main pumps, travel motors).
• Cranes (luffing, slewing mechanisms).
• Road rollers (vibration systems).
• Industrial Equipment:
• Injection molding machine hydraulic drives.
• Die-casting machine clamping systems.
• CNC machine tool hydraulic clamping.
• Specialized Vehicles:
• Fire truck ladder elevation.
• Marine deck machinery (anchors, winches).
• Testing Equipment:
• Hydraulic fatigue test benches.
• Flight simulator motion systems.
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6. Common Faults and Solutions
【表格】
Symptom Possible Causes Solutions
Insufficient Flow Clogged filter, small swashplate angle, internal leakage Clean filter, adjust displacement mechanism, replace seals
Pressure Fluctuation Worn valve plate, oil contamination, air ingestion Repair valve plate, replace hydraulic oil, bleed air
Abnormal Noise Bearing failure, piston seizure, cavitation Replace bearings, clean piston pairs, check suction lines
High Oil Temperature Insufficient cooling, excessive displacement, improper oil viscosity Enhance cooling, adjust displacement, use correct oil
Severe Leakage Aged seals, excessive cylinder-valve plate clearance Replace seals, lap valve plate surface
