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Product details
1. Product Overview
TheCBMW Type Compound Gear Pumpis a hydraulic pump that integrates the advantages ofexternal gear pumpsandinternal gear pumps, utilizing a compound gear structure to achieve efficient and low-noise fluid delivery. Its design incorporates multi-stage gear meshing technology, making it suitable for medium-to-high-pressure hydraulic systems, especially in applications requiring high flow stability and low noise.
2. Structural Features
• Compound Gear Design:
• External Gear Set: The main driving gear meshes externally with the driven gear to provide base displacement.
• Internal Gear Set: A crescent-shaped separator divides the inner and outer gears, forming a secondary pressurization chamber to enhance output pressure.
• Axial Compensation Mechanism: Floating side plates automatically compensate for gear end-face clearance, reducing leakage and improving volumetric efficiency.
• Low-Noise Design: Gear profile modification (e.g., tip relief, crowned tooth) minimizes meshing impact for smoother operation.
• Material Optimization: Gears are made of high-strength alloy steel (e.g., 20CrMnTi) with carburized and quenched surfaces for wear resistance and fatigue resistance; pump bodies are cast iron or aluminum alloy to suit different operating conditions.
3. Working Principle
1. Suction Phase: As gears disengage, a vacuum forms, drawing oil into the inlet.
2. Primary Pressurization: Rotating external gears compress oil into the high-pressure chamber.
3. Secondary Pressurization: The internal gear set further compresses oil, directing it to the outlet via the crescent separator.
4. Discharge Phase: High-pressure oil exits through the outlet, completing hydraulic energy conversion.
Advantage: The compound structure enables higher pressure output at the same rotational speed while reducing flow pulsation (pulsation rate ≤3%).
4. Key Technical Parameters
【表格】
Parameter Typical Range
Displacement 0.5–100 mL/rev (model-dependent)
Rated Pressure 16–25 MPa (some models up to 35 MPa)
Peak Pressure 21–31.5 MPa
Speed Range 500–3000 rpm
Volumetric Efficiency ≥92% (rated conditions)
Noise Level ≤70 dB(A) (at 1 m distance)
Fluid Temperature -20°C to +80°C (special models up to 120°C)
Viscosity Range 10–400 mm²/s (recommended N32–N68 hydraulic oil)
5. Typical Applications
• Construction Machinery: Hydraulic main/auxiliary pumps for excavators, loaders, and cranes.
• Industrial Equipment: Hydraulic power units for injection molding machines, die-casting machines, and machine tools.
• Agricultural Machinery: Hydraulic steering and lifting systems for tractors and combine harvesters.
• Marine Equipment: Hydraulic drives for steering gears and deck machinery.
• Automation: Precision hydraulic control in robots and packaging machinery.
6. Selection Guide
1. Determine Operational Requirements:
• Calculate system flow (Q = Displacement × Speed) and pressure (accounting for pipeline losses).
• Confirm fluid type (mineral oil, biodegradable oil, water-glycol, etc.).
2. Match Pump Parameters:
• Select a model with displacement close to calculated values to avoid oversizing/undersizing.
• Ensure rated pressure exceeds system maximum working pressure by ≥20%.
3. Environmental Adaptability:
• High-temperature environments: Use high-temperature seals (e.g., fluororubber) and cooling systems.
• Low-temperature startups: Equip with preheating systems or use low-viscosity hydraulic oil.
4. Installation & Maintenance:
• Verify correct inlet/outlet orientation and avoid reverse rotation.
• Replace filters regularly (recommended filtration精度 ≤25 μm).
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
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3 year
Main Product:
hydraulic motor,
gear box ,
hydraulic pump,
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