1. Product Positioning and Core Advantages
The BMH series Orbit Hydraulic Motors arelow-speed, high-torque hydraulic motorsfeaturing an advancedGeroler Gear Set (internal gear ring with cycloidal rotor design). Key advantages include:
• High-pressure automatic compensation: Suitable for high-pressure applications (max. continuous pressure: 17.5 MPa; peak pressure: 20 MPa).
• High efficiency and reliability: Low starting pressure reduces energy loss, with mechanical efficiency >85%.
• Long service life: High-strength materials for critical components (e.g., bearings, gears) ensure >8,000 hours of operation.
• Compact design: Small size and lightweight (e.g., BMH500 weighs only 13 kg) for easy installation and integration.
2. Key Technical Specifications (BMH500 Example)
【表格】
Parameter BMH500 Typical Value Series Range
Displacement 489.2 cc/rev 203.2–489.2 cc/rev
Rated Torque Continuous: 830 N·m; Peak: 1,840 N·m Continuous: 510–850 N·m
Rated Pressure Continuous: 12.5 MPa; Peak: 16 MPa Continuous: 12.5–17.5 MPa
Rated Speed Continuous: 155 rpm; Peak: 184 rpm Continuous: 155–366 rpm
Max Flow Rate 75 L/min 75–90 L/min
Weight 13 kg 10.5–13 kg
3. Core Performance Features
1. Low-Speed Stability
• Cycloidal gear design enables ultra-low-speed smooth operation (minimum 5 rpm), ideal for heavy-duty cold starts (e.g., excavator travel drives).
• Minimal torque fluctuation ensures consistent output and prevents equipment vibration.
2. High Load Capacity
• Double-row tapered roller bearings support high radial (10–30 kN) and axial loads (5–15 kN).
• Directly drives heavy-duty equipment (e.g., drilling rig power heads, ship winches).
3. Adaptability to Harsh Conditions
• Shaft seal design withstands high backpressure (≤10 MPa), suitable for closed-loop hydraulic systems.
• Supports parallel/series configurations to meet varying pressure/flow demands (e.g., multi-motor systems for large conveyors).
4. Low-Noise Operation
• Optimized porting system reduces operational noise, meeting industrial noise standards (≤85 dB).
4. Typical Applications
1. Construction Machinery
• Excavator travel/swing drives, drilling rig power heads, concrete pump truck mixing systems.
2. Agricultural Machinery
• Combine harvester threshing units, fishing boat winches, tractor hydraulic lift systems.
3. Industrial Equipment
• Injection molding machine screw drives, conveyor roller drives, woodworking machine feed systems.
4. Marine and Offshore Engineering
• Fishing boat trawl systems, port crane luffing mechanisms, offshore drilling platform equipment.
5. Selection and Usage Recommendations
1. Displacement Selection
• Match displacement to load requirements: Heavy-duty applications (e.g., drilling rigs) should prioritize larger displacement (e.g., BMH500) to reduce system pressure and heat.
2. Pressure Matching
• Ensure system pressure does not exceed the motor’s peak pressure (e.g., BMH500 peak: 16 MPa) to avoid seal damage.
3. Speed Control
• Avoid prolonged operation above rated speed (e.g., BMH500 continuous: ≤155 rpm) to minimize wear.
4. Hydraulic Fluid Selection
• Recommended: ISO VG 68 anti-wear hydraulic oil (viscosity: 37–73 cSt), cleanliness class ISO 18/13.
5. Installation and Maintenance
• Pre-fill with hydraulic oil before installation to prevent dry starts.
• Regularly replace filters and monitor oil cleanliness to extend seal life.
6. Competitor Comparison
【表格】
Comparison Item BMH Series Eaton 2K/Danfoss OMS Series Budget Chinese Motors
Pressure Range Continuous: 12.5–17.5 MPa Continuous: 25–30 MPa Continuous: 12–16 MPa
Price Tier Mid-range (cost-effective) Premium Budget
Target Applications Medium-to-heavy general use Ultra-high-pressure, precision control Light-duty or cost-sensitive scenarios
7. Summary
The BMH series Orbit Hydraulic Motors arecost-effective mid-range solutionsfor medium-to-heavy, low-speed, high-torque applications. They excel incompact design, efficiency, reliability, and low maintenance costs, making them viable alternatives to premium brands (e.g., Eaton 2K, Danfoss OMS) in non-extreme conditions. For ultra-high-pressure or precision control needs, evaluate their peak pressure limits (16–20 MPa) or consider specialized high-pressure models.
