------
1. Product Positioning and Series Classification
BH Hydraulic Motor
• Positioning: Mid-to-low speed, high-torque hydraulic motor designed for rotary drives in construction machinery, agricultural equipment, and industrial systems.
• Design Features:
• Axial Piston Structure: Utilizes a swashplate axial piston design for high volumetric efficiency (≥92%).
• Modular Design: Supports multiple displacement options (e.g., 50-300 cm³/rev) with customizable flange, shaft end, and port configurations.
• Lightweight: Aluminum alloy housing reduces weight by 10%-15% compared to similar products.
• Technical Specifications:
• Displacement Range: 50-300 cm³/rev (standard), 400 cm³/rev (large displacement optional).
• Rated Pressure: 250 bar (continuous), peak pressure 300 bar.
• Speed Range: 0-600 rpm (no-load), 0-400 rpm (full-load).
• Peak Torque: 500-3000 Nm (varies by displacement).
BM3Y Hydraulic Motor
• Positioning: High-speed, low-torque hydraulic motor tailored for lightweight equipment, automation systems, and precision control applications.
• Design Features:
• Gear-Type Structure: Adopts double-circular-arc gears to reduce noise (<68 dB) and extend lifespan.
• Compact Design: Small footprint for space-constrained installations.
• High-Speed Adaptability: Optimized bearing configuration supports speeds up to 1500 rpm.
• Technical Specifications:
• Displacement Range: 10-100 cm³/rev (standard), 150 cm³/rev (large displacement optional).
• Rated Pressure: 180 bar (continuous), peak pressure 220 bar.
• Speed Range: 0-1500 rpm (no-load), 0-1000 rpm (full-load).
• Peak Torque: 80-500 Nm (varies by displacement).
------
2. Core Design Differences
【表格】
Parameter BH Hydraulic Motor BM3Y Hydraulic Motor
Structure Type Axial piston Gear-type
Pressure Adaptability High (250-300 bar) Medium (180-220 bar)
Speed Range Mid-to-low (0-600 rpm) High (0-1500 rpm)
Torque Output High (500-3000 Nm) Low (80-500 Nm)
Efficiency Mechanical: 88%-90%, Volumetric: 92%-94% Mechanical: 85%-87%, Volumetric: 90%-92%
Noise Level 70-75 dB (full-load) <68 dB (full-load)
Sealing Design Dual-lip rubber seal (IP65) Single-lip rubber seal (IP64)
------
3. Performance Comparison and Selection Guide
(1) Torque and Efficiency
• BH Motor:
• Mechanical Efficiency: 88%-90% (stable under high pressure).
• Volumetric Efficiency: 92%-94% (advantageous at mid-to-low speeds).
• Applications: Heavy-duty equipment (e.g., excavator slewing drives, road roller vibration wheels).
• BM3Y Motor:
• Mechanical Efficiency: 85%-87% (slightly lower at high speeds).
• Volumetric Efficiency: 90%-92% (suitable for light-load, high-frequency motion).
• Applications: Lightweight equipment (e.g., agricultural harvester conveyors, automated sorting systems).
(2) Environmental Adaptability
• BH Motor:
• Operating Temperature: -20°C to +60°C (mineral oil).
• Contamination Resistance: Compatible with NAS 6-grade oil (requires regular filtration).
• BM3Y Motor:
• Operating Temperature: -15°C to +50°C (mineral oil).
• Contamination Resistance: Compatible with NAS 8-grade oil (higher cleanliness requirements).
(3) Maintenance and Lifespan
• BH Motor:
• Oil Change Interval: 2000 hours (mineral oil), 4000 hours (synthetic oil).
• Expected Lifespan: 10,000-15,000 hours (continuous heavy-load operation).
• BM3Y Motor:
• Oil Change Interval: 1500 hours (mineral oil), 3000 hours (synthetic oil).
• Expected Lifespan: 8,000-12,000 hours (light-load, high-frequency use).
------
4. Typical Application Cases
Case 1: Excavator Slewing Drive (BH Motor)
• Requirements: Stable low-speed rotation, high torque output.
• Selection Basis:
• Displacement: 200 cm³/rev (matches hydraulic pump flow).
• Pressure: 280 bar (meets slewing load demands).
• Interface: SAE B flange (direct replacement for original model).
• Results: Reduced slewing start time by 15%, energy consumption by 10%.
Case 2: Agricultural Harvester Conveyor (BM3Y Motor)
• Requirements: High-speed operation, low noise, compact installation.
• Selection Basis:
• Displacement: 50 cm³/rev (meets high-speed needs).
• Sealing: Single-lip seal (dust/moisture resistance).
• Speed: 1200 rpm (matches conveyor belt speed).
• Results: Increased conveyor efficiency by 20%, reduced failure rate by 30%.
------
5. Key Selection Steps
1. Define Operating Parameters:
• Load torque (Nm), working speed (rpm), system pressure (bar).
• Ambient temperature, oil cleanliness (NAS grade).
2. Match Displacement and Pressure:
• Formula: Displacement (cm³/rev) = Flow (L/min) × 60 / Speed (rpm).
• Example: Flow = 60 L/min, Speed = 300 rpm → Displacement = 12 cm³/rev (select BM3Y standard model).
3. Verify Interface Compatibility:
• Check shaft dimensions (diameter, keyway), flange bolt pattern, and port thread (NPT/BSP).
4. Consult Manufacturer Support:
• Provide load profile data for customized selection reports.
------
6. Common Issues and Solutions
【表格】
Issue BH Motor Possible Causes BM3Y Motor Possible Causes Solutions
Motor Leakage Seal aging or oil contamination Seal wear or improper installation Replace seals, upgrade oil filtration
Insufficient Torque Low system pressure or gear wear Bearing seizure or undersized displacement Adjust pressure valve, inspect bearing lubrication
Abnormal Noise
Bearing failure or cavitation
Poor gear meshing
Replace bearings, optimize suction line design
