BMER Series Orbit Motor | BMER-250 BMER-400 BMER-750 | Low Speed High Torque Drive

The BMER Series orbit hydraulic motors by Chengyuan Hydraulic are heavy-duty power units designed for applications requiring high torque and long-term durability. Utilizing the advanced Geroler (roller-vane) structure, this series minimizes internal friction while maximizing mechanical efficiency. Covering displacements from BMER-250 to BMER-750, these motors feature a patented balanced valving system that provides smooth, powerful torque even at ultra-low speeds. Every BMER motor undergoes 100% simulated full-load testing to ensure that volumetric efficiency and starting torque meet global standards, guaranteeing 100% original-place interchangeability with leading brands.

Technical Specifications :

• Core Model Range: BMER-200, BMER-250, BMER-375, BMER-400, BMER-475, BMER-540, BMER-750

• Displacement: $200\text{ cm}^3/\text{rev}$ to $750\text{ cm}^3/\text{rev}$

• Max Continuous Pressure: Up to $20.5\text{ MPa (205 bar / 2975 psi)}$

• Intermittent Peak Pressure: Up to $27.5\text{ MPa (275 bar / 3990 psi)}$

• Max Output Torque: $500\text{ Nm}$ to $1500\text{ Nm}$

• Max Continuous Speed: $150\text{–}400\text{ rpm}$ (Size dependent)

• Shaft Options (WD/VD): $31.75\text{mm}$ Straight, $32\text{mm}$ Tapered, or $14\text{-Tooth}$ Spline

• Mounting Flange (FD1): Standard 4-bolt Rhombic or Wheel Mount configurations

• Fluid Compatibility: Mineral-based hydraulic oils

Key Technical Advantages:

• Advanced Geroler Technology: Unlike standard gerotor motors, the BMER series incorporates hardened steel rollers. This minimizes metal-to-metal contact, drastically improving startup efficiency and ensuring exceptional service life during frequent reversing cycles.

• High-Pressure Shaft Seal & Balanced Valving: Equipped with premium high-pressure shaft seals (VD models withstand high backpressure), these motors often operate without a case drain. The automatic balanced valve plate compensates for clearances under load, maintaining peak volumetric efficiency at $20\text{ MPa}$.

• Excellent Low-Speed Stability: Precision-engineered timing grooves ensure smooth operation at speeds below $10\text{ rpm}$ without “cogging.” This is critical for harvest machine drives and swing mechanisms in construction equipment.

• Heavy-Duty Bearing Load Capacity: Integrated large-diameter tapered roller bearings allow the motor to directly withstand significant radial and axial loads. In many cases, BMER motors can directly drive heavy wheels or winch drums without external bearing support.

Application Areas:

• Mobile Drives: Wheel loader traction and self-propelled aerial work platforms.

• Construction Machinery: Power heads for rotary drilling rigs and road cold millers.

• Industrial Equipment: Heavy-duty conveyors, injection molding clamping, and large-scale winches.

Expert Maintenance Tips:

• System Bleeding: After installation, run the motor under no-load conditions to purge air from the housing, preventing cavitation damage to the Geroler set.

• Backpressure Management: If the system backpressure consistently exceeds $5\text{ MPa}$, connecting the case drain port is highly recommended to maximize shaft seal life.

• Cleanliness Standards: To protect the precision Geroler assembly, system filtration must be maintained at $20\mu\text{m}$ or better.