BM3 Series hydraulic oribit motor
2 month ago
Product details
TheBM3 Series hydraulic orbit motorsare low-speed, high-torque (LSHT) hydraulic actuators designed based onorbital gearing principles, widely applied in construction machinery, agricultural equipment, marine systems, and industrial automation. Below is a structured breakdown of their technical features, performance parameters, typical applications, and maintenance guidelines.
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I. Core Technology and Design Advantages
1. Orbital Gearing Mechanism
• Gerotor (Inner Rotor-Outer Stator) Engagement: The eccentric shaft drives the inner rotor, forming multiple sealed chambers with the outer stator. Hydraulic pressure rotates the rotor along the orbital path, converting hydraulic energy into mechanical torque.
• Multi-Tooth Meshing Structure: A single-stage gerotor pair creates3–5 sealed chambers, enhancing torque stability and reducing pulsation noise.
2. Key Technical Benefits
• Low-Speed, High-Torque Output:
• Speed range:10–500 RPM
• Torque density:30–500 Nm/cm³
• Ideal for heavy-load startups (e.g., winches, auger drives).
• Bidirectional Reversibility: Direction changes via hydraulic oil flow reversal, eliminating mechanical reversing mechanisms.
• Compact & Efficient:
• Mechanical efficiency:75%–85%
• 30%–40% smaller volume than gear motors for equivalent torque.
• Environmental Adaptability:
• Operating temperature:-20°C to +80°C
• Explosion-proof (Ex d IIB T4) options for mining/chemical applications.
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II. Key Performance Parameters (BM3-250 Example)
【表格】
Parameter Technical Specifications BM3-250 Typical Values
Displacement 50–800 cc/rev (customizable) 250 cc/rev
Rated Pressure 210 bar (3,045 psi) 250 bar
Peak Pressure 280 bar (4,060 psi) 315 bar
Max. Speed 450 RPM (torque-dependent) 380 RPM
Continuous Torque 750–3,200 Nm (553–2,360 lb-ft) 1,800 Nm
Startup Efficiency ≥90% (ISO 6336 standard) 92%
Port Interface SAE J518C, ISO 6162 SAE 1.5" BSPP threads
Mounting Options Foot, flange, axial Flange (SAE B standard)
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III. Typical Applications and Industry Cases
1. Construction Machinery
• Rotary Drilling Rig: BM3-630 delivers4,200 Nmtorque for drilling φ1.5m holes in hard rock.
• Crawler Crane Slewing: BM3-125 integrated into slewing gearboxes for ±360° precise positioning.
2. Agricultural Equipment
• Silage Baling Machine: BM3-80 drives rollers at25 tons/hourcompression efficiency.
• Sugar Cane Harvester Stripping Unit: BM3-160 outputs80 RPMfor ≥98% stripping accuracy.
3. Marine & Offshore Engineering
• Deck Crane Winch: BM3-500 paired with planetary gearboxes lifts15 tonsto 30m height.
• ROV Underwater Robot Thruster: BM3-100 withstands3,000mwater pressure for deep-sea exploration.
4. Industrial Automation
• Hydraulic Press Main Cylinder Drive: BM3-400 provides12,000 Nmtorque for2,000-tonpressing force.
• Material Conveying & Sorting System: BM3-63 drives roller lines at1,200 pieces/hoursorting efficiency.
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IV. Competitive Analysis: BM3 vs. Alternatives
【表格】
Comparison Metric BM3 Orbit Motor Gear Motor Piston Motor
Torque Density ★★★★☆ (High) ★★★☆☆ (Medium) ★★★★★ (Very High)
Speed Range 10–500 RPM (Low-Speed Focus) 500–3,000 RPM (High-Speed) 50–2,000 RPM (Medium-Speed)
Volumetric Efficiency 92%–95% 88%–92% 95%–98%
Noise Level ≤75 dB(A) (Quiet Design) ≥85 dB(A) (Gear Meshing) ≤70 dB(A) (Precision-Built)
Contamination Tolerance ISO 4406 19/17/14 ISO 4406 18/16/13 ISO 4406 17/15/12
Cost-Effectiveness Mid-to-High (Low LCC) Low (Initial Purchase) High (Precision Demands)
Selection Recommendations:
• Prioritize BM3 Series: Heavy-load startups, low-speed operations, space-constrained designs (e.g., mini-excavator slewing).
• Gear Motor Alternatives: Noise-insensitive, high-speed (>1,000 RPM) light-load applications (e.g., fans).
• Piston Motor Alternatives: Precision speed control (e.g., injection molding), ultra-high pressure (>350 bar) demands.
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V. Maintenance & Troubleshooting
1. Routine Maintenance
• Hydraulic Oil Management: Replace every 500 hours (ISO VG46 recommended). Regularly test contamination levels (NAS 1638 ≤7).
• Seal Inspection: Check shaft seals every 2,000 hours. Replace with FKM (Viton®) for -25°C to +200°C applications.
• Bearing Lubrication: Replenish lithium grease (NLGI Grade 2) via housing fill ports every 1,000 hours.
2. Common Faults & Solutions【表格】
Fault Symptom Potential Cause Solution
Insufficient Torque Low oil viscosity/pump flow Replace with ISO VG68 oil/check pump
Leakage Aged shaft seals/casting defects Replace seals/weld repair
Abnormal Vibration Excessive rotor-stator clearance Factory recalibration (≤0.1mm tolerance)
Overheating High backpressure/cooling issues Install external cooler/optimize piping
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VI. Technical Selection & Supplier Recommendations
1. Key Selection Parameters
• Load Torque Calculation:
T=P×Q2π×η T = \frac{P \times Q}{2\pi \times \eta} T=2π×ηP×Q
(T: Torque, P: Pressure, Q: Displacement, η: Mechanical Efficiency)
• Speed Matching: Ensure max. motor speed exceeds system requirements by ≥20%.
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
3 year
Main Product:
hydraulic motor,
gear box,
hydraulic pump,
hydraulic valve ,
hydraulic winch,
hydraulic system
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