BMP Series Hydraulic Motor

BMP Series Hydraulic Motor Core Technical Specifications

Key Specification Notes & Supplementary Parameters

• Pressure Conversion: The rated pressure of 16.0 MPa is equivalent to 160 kgf/cm² (2320 psi), and the maximum pressure of 20.0 MPa is equivalent to 200 kgf/cm² (2900 psi), ensuring excellent load-bearing capacity in low-speed, high-torque working scenarios[superscript:1].
• Structural Features: The BMP series adopts an orbital (cycloid) structure, with a built-in needle bearing and high-strength alloy rotor, which effectively reduces wear and extends service life. It has good anti-pollution performance, adapting to the harsh working environment of industrial and agricultural sites.
• Torque & Speed Performance: The torque of the BMP series is positively correlated with displacement—the larger the displacement, the higher the output torque, and the lower the maximum speed, which is perfectly suitable for low-speed, heavy-load transmission requirements (such as conveyor belts, winches, and agricultural machinery traction).
• Hydraulic Oil Requirements: Clean petroleum-based anti-wear hydraulic oil equivalent to ISO VG 32 or 46 is recommended. The viscosity range should be 20 to 400 mm²/s, and the normal operating oil temperature should be 0°C to 60°C. The oil should comply with relevant hydraulic oil quality standards to avoid component wear[superscript:1].
• Permissible Back Pressure: The maximum permissible back pressure of the motor’s return oil port is 0.8 MPa (8 kgf/cm²). If the system back pressure exceeds this value, an overflow valve should be installed to protect the motor seal and internal components[superscript:1].
• Pollution Control: To ensure stable operation and extend service life, the oil pollution degree should be kept within NAS 10 level. A pipeline filter smaller than 10 μm is recommended in the hydraulic system to prevent impurities from entering the motor[superscript:1].
• Model Composition: The model code includes series number and geometric displacement. For example, “BMP-32” indicates BMP series with a geometric displacement of 32 cm³/rev. Optional configurations include flange mounting, foot mounting, and different shaft extension types to meet diverse installation needs.

Installation & Operation Specifications

• Mounting Requirements: The motor supports flange and foot mounting; during installation, ensure the mounting surface is flat and clean, and the fasteners are tightened evenly to avoid vibration during operation. The motor can be installed in any direction, but the oil filling port should be facing upward to avoid air accumulation.
• Shaft Connection: A flexible coupling is recommended to connect the motor shaft with the load shaft, reducing coaxiality error. The maximum allowable coaxiality error (TIR) is less than 0.1 mm, and the maximum allowable angle error is less than 0.2° to avoid shaft damage.
• Oil Piping Requirements: The recommended inner diameter of the inlet and return oil pipes should match the motor’s interface size to ensure smooth oil flow. The drain pipe should be installed independently, with a length less than 1.5m, to avoid pressure buildup in the motor casing.
• Start-Up & Operation: Before the first start-up, inject clean hydraulic oil into the motor through the oil filling port to ensure all internal components are lubricated. Run the motor under no-load for 2-3 minutes to exhaust air and check for oil leakage, abnormal noise, or overheating.
• Seal Material: The standard seal material is FKM (fluoro rubber), which has excellent high-temperature and oil resistance, adapting to the operating environment of the BMP series and complying with relevant seal material standards[superscript:1].