BMH BM4 BM5 BM6 Series Orbital Hydraulic Motors | High Torque BM6-800 BM5-630 BM4-490

Chengyuan Hydraulic BM series (BMH, BM4, BM5, BM6) cycloidal hydraulic motors are engineered for demanding Low Speed High Torque (LSHT) applications. We prioritize 100% functional and dimensional interchangeability with industry standards like Danfoss OMH/OMS/OMT and Eaton Char-Lynn series. Every unit undergoes 100% simulated duty cycle testing to guarantee superior volumetric efficiency and long-term reliability under peak loads.

Technical Specifications (Sample Data: BM6/OMT Series)

• Model Series: BM6 (Interchangeable with 6K / OMT)

• Displacement Options: $195\text{, }245\text{, }310\text{, }490\text{, }630\text{, }800\text{, }985\text{ cc/rev}$

• Rated Pressure: $20\text{ MPa (2900 psi)}$

• Peak Pressure: $24\text{ MPa (3480 psi)}$

• Max Speed: Up to $750\text{ rpm}$ (depending on displacement)

• Max Torque: Up to $2300\text{ N}\cdot\text{m}$ (for BM6-985)

• Valve Type: Disk Valve distribution

• Shaft Seal: High-pressure resistant NBR/Viton seals

Key Technical Advantages

• Advanced Geroler Set: The roller-supported rotor design reduces mechanical friction during startup, ensuring smooth rotation and consistent torque output even at ultra-low speeds.

• Disk Valve Compensation: The independent disk valve rotates synchronously with the output shaft and features automatic axial clearance compensation to maintain high efficiency as components age.

• Heavy-Duty Bearing Support: Equipped with high-capacity tapered roller bearings, these motors can handle substantial radial and axial loads, allowing for direct-mounted sprockets or gears.

• Ductile Iron Construction: The high-tensile housing provides excellent thermal stability and rigidity, preventing internal misalignment under extreme hydraulic shock.

Application Areas

• Marine & Winch Drives: Anchor winches, deck cranes, and fishing boat net haulers.

• Mobile Hydraulics: Wheel drives for compact loaders, trenchers, and skid steers.

• Industrial Machinery: Heavy-duty conveyors, shredders, and plastic injection molding machines.

Expert Maintenance Tips

• System Priming: Before full-load operation, fill the motor housing with clean hydraulic oil through the drain port to ensure immediate lubrication of the internal splines.

• Case Drain Management: For applications with frequent reversals or high back-pressure, utilizing the external case drain line is highly recommended to protect the shaft seal and reduce internal heat buildup.

• Filtration Integrity: Maintain fluid cleanliness to ISO 4406 19/17/14 or better. Contamination is the leading cause of orbital motor wear and torque loss.