BMT Cycloidal Motor

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Product details

BMT Cycloidal Motor – Product Introduction

Product Overview

The BMT series cycloidal motor (BMT Cycloidal Motor) is an advanced hydraulic motor with face distribution (end-face porting) and a inserted roller gerotor gear set (8/9 tooth design). As a high‑performance Hydraulic orbit motor, the BMT series features a compact structure and low‑speed high‑torque output, making it widely used as a core component in various construction machinery and industrial equipment within hydraulic systems.

The BMT series is fully interchangeable with internationally renowned brands such as Danfoss OMT and Eaton 6K, offering an ideal alternative to imported solutions.

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Technical Features

1. Advanced porting and gear design

The BMT series motor adopts an advanced gerotor gear set design with disc distribution flow and high‑pressure capability. The face‑distribution porting ensures high metering accuracy and automatic wear compensation, guaranteeing high volumetric efficiency and long service life.

2. High operating pressure and high torque output

With high working pressure and large output torque, the motor uses tapered roller bearings that provide excellent radial and axial load capacity, allowing direct drive of working mechanisms with broad application scope. The special shaft seal design permits a maximum back pressure of up to 10 MPa.

3. Excellent starting performance

Advanced rotor/stator parameter design results in low starting pressure, high efficiency, good retention, and smooth operation.

4. Smooth and reliable operation

Smooth running over the entire speed range with constant operating torque. Advanced manufacturing processes ensure low noise and low vibration, providing stable and reliable performance.

5. Multiple mounting options

A variety of flange types, output shafts (parallel key / spline), and port sizes are available. Customised variants can be supplied according to user requirements.

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Main Performance Parameters (Representative Models)

Model Displacement (cm³/rev) Max. continuous speed (rpm) Max. continuous torque (N·m) Max. continuous pressure differential (MPa)

BMT 160 161.1 625 470 20

BMT 200 201.4 625 590 20

BMT 250 251.8 500 730 20

BMT 315 326.3 380 950 20

BMT 400 410.9 305 1080 18

BMT 500 523.6 240 1220 16

BMT 630 629.1 196 1318 14

BMT 800 801.8 154 1464 12.5

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Application Fields

As a core actuator in hydraulic systems, the BMT cycloidal motor is widely used in:

· Construction machinery: mini excavators, road rollers, sweepers, down‑the‑hole drills

· Agricultural machinery: combine harvesters, seed drills, rotary tillers, mowers

· Industrial equipment: injection moulding machines, shoe‑making machinery, textile machinery, printing machinery

· Fishery and marine machinery: fishing vessel equipment, winch drives

· Mining and metallurgical machinery: crushers, screens, stackers

· Lifting and transport machinery: cranes, conveying equipment, material handling equipment

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Usage and Maintenance Recommendations

To ensure optimal performance of the BMT Hydraulic orbit motor within your hydraulic system, please observe the following:

· Hydraulic fluid: Use anti‑wear hydraulic oil with viscosity 37–73 cSt, cleanliness ISO 18/13.

· Operating temperature: Maximum recommended oil temperature is 80°C.

· Back pressure control: Maximum allowable back pressure is 10 MPa; recommended ≤5 MPa. For back pressure exceeding 5 MPa, an external drain line is advised.

· Break‑in period: Before full‑load operation, it is recommended to run at 30% of maximum working pressure for 1 hour.

· Filtration: Recommended filtration level ISO 18/13.

1. Core Technical Positioning of BMT Cycloidal Motors

BMT cycloidal motors are a quintessential example oflow-speed, high-torque hydraulic orbit motors, leveraging the cycloidal gear meshing principle. Through eccentric motion between the stator (internal gear) and rotor (external gear), they form sealed chambers to efficiently convert hydraulic energy into mechanical energy. Their technical characteristics align seamlessly with the energy transfer demands of hydraulic systems, making them ideal for heavy-duty applications in construction machinery, agricultural equipment, and marine engineering.

2. Technical Advantages of BMT Cycloidal Motors

2.1 Low-Speed, High-Torque Output

• Displacement Range: 50–1,250 mL/r, catering to light-duty to heavy-duty equipment.

• Low Starting Pressure: Mechanical efficiency exceeds 85%, enabling stable high-torque output at low speeds while minimizing energy loss. For instance, the BMS-250 model delivers 551 N·m of torque under continuous pressure of 12.5 MPa, meeting the high-load demands of mining machinery crushers.

2.2 Compact Structure and High Power Density

• Small Size, Lightweight: Compared to other hydraulic motors, BMT models are over 30% smaller in volume for the same torque output, allowing direct connection to working mechanisms without reduction gears. For example, the BMS-80 weighs just 9.8 kg but generates 194 N·m of torque, making it suitable for space-constrained agricultural machinery.

• Bidirectional Rotation: Supports seamless forward/reverse switching without downtime, ideal for excavator slewing mechanisms requiring frequent directional changes.

2.3 High Reliability and Long Lifespan

• High-Pressure Resistance: Some models withstand system pressures up to 30 MPa, thriving in harsh conditions.

• Dual Rolling Bearing Design: Handles high radial loads, reducing wear and extending operational life beyond 10,000 hours.

2.4 Modularity and Adaptability

• Diverse Connection Options: Features flange, output shaft, and port interfaces, supporting series/parallel configurations for flexible integration into hydraulic system architectures.

• Global Standard Compatibility: Models like the BMS series can replace Danfoss OMS and Eaton 2000 series, lowering upgrade costs for equipment manufacturers.

3. Synergistic Application in Hydraulic Systems

3.1 Energy Transfer and Control

• Actuator Role: As the core actuator in hydraulic systems, BMT cycloidal motors convert high-pressure oil from hydraulic pumps into mechanical energy to drive loads (e.g., crane booms, excavator arms).

• Dynamic Response: Hydraulic system controllers adjust pump flow rates to regulate motor speed and torque in real time. For example, in electric excavators, BMS motors collaborate with electric pumps to dynamically adjust power output based on digging depth.

3.2 Energy Efficiency Optimization

• Lean Combustion Technology: Some BMT motors adopt multi-valve, multi-spark plug designs (similar to Benelli’s BMT powertrain technology) to enhance fuel combustion efficiency, reducing hydraulic system energy consumption.

• Load-Sensing Control: Pressure feedback from the hydraulic system automatically adjusts motor displacement to prevent energy waste. In agricultural machinery, BMS motors modulate speed based on soil resistance, minimizing idle power usage.

3.3 Fault Protection and Safety

• Overload Protection: Safety valves integrated into the hydraulic system relieve pressure when motor loads exceed rated limits, preventing damage.

• Thermal Management: Hydraulic oil circulation dissipates heat generated by motor operation, while BMT motors’ low starting pressure characteristics mitigate performance degradation under high temperatures.

4. Typical Application Scenarios

4.1 Construction Machinery

• Excavators: BMS motors drive slewing mechanisms, delivering low-speed, high-torque digging for enhanced operational stability.

• Cranes: Tandem BMT motors boost lifting capacity for heavy cargo handling.

4.2 Agricultural Machinery

• Combine Harvesters: BMS-125 motors power header height adjustments, adapting to varying crop heights for improved harvesting efficiency.

• Tractors: Hydraulic systems with BMT motors enable four-wheel drive, enhancing traction in muddy terrain.

4.3 Industrial Automation

• Injection Molding Machines: BMT motors provide precise low-speed motion control for mold opening/closing, improving product yield.

• Robotic Joints: Lightweight BMS motors support high-speed rotation, meeting the agility requirements of industrial robots.

5. Technical Comparison and Selection Guidelines

【表格】

Parameter BMT Cycloidal Motors Other Hydraulic Motors (e.g., Gear Motors)

Speed Range 10–810 rpm (widely adjustable) Typically >500 rpm (high-speed motors)

Torque Output High (suitable for heavy loads) Lower (requires reduction gears for torque)

Efficiency Mechanical efficiency >85% Lower volumetric efficiency (prone to leakage)

Application Low-speed, heavy-duty (mining, construction) High-speed, light-duty (packaging, injection molding)

Key Selection Criteria:

• Load Requirements: Choose displacement based on torque and speed needs (e.g., BMS-200 for medium excavators).

• System Pressure: Match hydraulic pump ratings to avoid motor overload (e.g., BMS-500 supports 30 MPa systems).

• Installation Space: Prioritize compact designs (e.g., BMS-80 length: 310 mm).