1. Product Overview
TheCB-B4is alow-pressure, small-to-medium displacementhydraulic gear oil pump belonging to the CB-B series. This series of pumps converts mechanical energy into hydraulic energy through a pair of meshing gears and is widely used in hydraulic systems, textile machinery, and as a hydraulic power source or lubricant delivery pump for small-to-medium-sized machinery.
------
2. Technical Specifications
• Displacement: 4 mL/rev
• Rated Flow: 4 L/min (at rated speed of 1,450 r/min)
• Rated Pressure: 2.5 MPa
• Rated Speed: 1,450 r/min
• Volumetric Efficiency: ≥80%
• Total Efficiency: ≥72%
• Pressure Pulsation: ±0.20 MPa
• Noise Level: 62–65 dB
• Drive Power: 0.37 kW
• Weight: 2.8 kg
------
3. Structural Features
1. External Gear Pump Design: Comprises a pair of meshing gears, pump body, front cover, and rear cover.
2. Material Selection:
• Pump Body, Front/Rear Covers: HT250 gray cast iron
• Gears: High-quality powder metallurgy
• Pump Shaft: 40Cr alloy steel (quenched and hardened)
• Bearings: SF-1 oil-free lubricated bearings or needle bearings
• Seals: Double-lip nitrile rubber oil seals
3. Gear Type: Straight or helical teeth (helical teeth offer lower noise operation).
4. Design Advantages:
• Simple structure, compact size, and lightweight.
• Excellent self-priming capability and smooth oil delivery.
• Easy maintenance and high reliability.
------
4. Working Principle
The pump operates through a pair of meshing gears rotating inside the pump chamber, creating volumetric changes:
• Suction Phase: As gears disengage, the volume increases, generating a vacuum to draw in oil.
• Discharge Phase: As gears engage, the volume decreases, forcing oil out under pressure.
------
5. Applications
1. Machine Tool Hydraulic Systems: Provides pressurized oil for feed and reversing mechanisms and lubricates guide surfaces and points.
2. Textile Machinery: Functions as a lubrication or oil transfer pump.
3. Construction Machinery: Serves as a hydraulic power source.
4. Other Fields: Used in metallurgy, mining, petroleum, and chemical industries for oil transfer, lubrication, or fuel delivery.
------
6. Common Faults & Troubleshooting
1. Vibration & Noise
• Causes: Air ingestion, mechanical wear, excessive oil viscosity, poor gear precision.
• Solutions: Lap sealing surfaces, replace oil seals, clean filters, adjust couplings, use oil with proper viscosity.
2. Insufficient Flow Output
• Causes: High oil temperature reducing viscosity, improper oil viscosity, incorrect pump installation, low engine speed.
• Solutions: Control oil temperature, select appropriate oil, correct pump orientation, check engine speed.
3. Poor Rotation
• Causes: Excessively small axial/radial clearances, contaminants inside pump, incorrect assembly, poor coupling alignment.
• Solutions: Adjust clearances, remove debris, reassemble correctly, ensure coupling alignment (≤0.1 mm).
4. Overheating
• Causes: Same as poor rotation, improper oil viscosity, friction between side plates/shaft sleeves and gear end faces, high ambient temperature.
• Solutions: Refer to poor rotation solutions, select proper oil, repair friction components, improve cooling.
------
7. Product Advantages
1. High Efficiency: Volumetric efficiency ≥80%, total efficiency ≥72%.
2. Low Noise: Operates at 62–65 dB; helical gears further reduce noise.
3. Long Service Life: Durable materials and precision manufacturing ensure reliable operation.
4. Easy Maintenance: Simple structure facilitates disassembly and repair.
------
8. Selection Recommendations
• Choose appropriate displacement and pressure ratings based on system requirements.
• Ensure oil viscosity ranges between 1–8°E (10°C–60°C).
• Avoid use in flammable, explosive, or media containing hard particulate contaminants.
• During installation, maintain coupling alignment (≤0.1 mm) and avoid forced impact.
