BM2 Cycloidal Motor

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Product details

1. Basic Product Definition

The BM2 is a compact hydraulic orbit motor adopting axial shaft distribution structure, falling into the medium-and-small-displacement low-speed high-torque category. It can be perfectly matched with all kinds of hydraulic system. Comparable to Danfoss OMR and Eaton 103/JS series in the industry, it features compact size and outstanding startup performance, capable of directly driving medium and light loads without extra reduction gears, which greatly simplifies the layout of the entire hydraulic system.

2. Structural Composition & Working Principle

2.1 Core Components

It consists of a front cover, output shaft, connecting coupling, integrated axial distribution shaft assembly, column-mounted cycloidal stator-rotor meshing pair, housing, rear cover and high weather-resistant seals. Its precision flow distribution structure ensures stable and reliable oil circuit switching within the hydraulic system.

2.2 Operating Mechanism

A 6-tooth cycloidal rotor meshes with a 7-tooth stator to form sealed volume chambers. The axial distribution shaft rotates synchronously with the rotor to switch oil passages. Driven by the hydraulic system, high-pressure fluid propels the rotor to conduct both rotation and revolution, and the rotational torque is output through the connecting structure. The axial distribution design greatly lowers the startup threshold and eliminates obvious crawling at low speeds, meeting the wide-range speed regulation requirements of hydraulic systems.

3. Core Structural Advantages

1. Optimized hydraulic orbit motor structure: The axial shaft distribution design delivers extremely low startup pressure, excellent low-speed stability and long-lasting stable oil distribution accuracy, suitable for long-term continuous operation of small and medium-sized hydraulic systems.

2. Wear-resistant column-type stator-rotor pair: It boasts prominent wear resistance and mild volumetric efficiency attenuation, extending the overall service life of the hydraulic system.

3. High backpressure resistant sealing structure: Imported dedicated shaft seals can endure high backpressure, supporting extended series and parallel circuit designs for hydraulic systems.

4. Modular multi-interface compatibility: Optional 2-hole/4-hole diamond flanges, keyed/rectangular splined output shafts and standard G1/2 oil ports enable retrofitting and replacement for most existing hydraulic systems.

5. Compact and lightweight body: It occupies little installation space, ideal for upgrading hydraulic systems on compact-sized equipment.

6. Shock-free reversing performance: It realizes smooth forward-reverse switching and a broad speed adjustment range, reducing pressure fluctuations inside hydraulic systems.

4. Model Naming Rules

Standard format: BM2-Displacement-Shaft Type-Flange Specification-Oil Port Parameter

- BM: General code for orbit hydraulic motors

- 2: Second-generation axial-distribution hydraulic orbit motor series

- Displacement: Mainstream specifications ranging from 50 to 500 mL/r

- Suffixes mark output shaft style, flange shoulder dimension and port thread in sequence, to precisely fit the mounting standards of original hydraulic systems

5. Key Technical Parameters

5.1 Displacement Range

Common options: 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500 mL/r

5.2 Pressure Parameters

- Continuous operating pressure difference: 9~14 MPa; maximum intermittent peak pressure difference: 21 MPa

- Max continuous inlet pressure: 17.5 MPa, matching the pressure grades of conventional industrial hydraulic systems

5.3 Rotational Speed & Torque

- Continuous rotational speed: 5~750 rpm; the upper speed limit decreases with the increase of displacement

- Continuous output torque: 108~560 N·m; short-term peak torque can increase by 30%~40%

5.4 Operation Specifications for Hydraulic Systems

- Recommended medium: No.46 / No.68 anti-wear hydraulic oil, operating oil temperature: -20℃~80℃

- Oil cleanliness: ISO 18/13 or above, to prevent impurities from abrading precision components of the hydraulic system

- Optimal working condition: Operate within 1/3~2/3 of rated parameters; simultaneous full-pressure and full-speed long-term operation of the hydraulic system is forbidden

6. Segmented Application Scenarios (Hydraulic System Implementation)

Hydraulic Systems for Agricultural & Forestry Machinery

Auxiliary drive for harvesters, garden trimmers, drive wheels of small agricultural machinery, hydraulic drive units for wood conveying rollers

Hydraulic Systems for Light Industry & Plastic Industry

Mold adjusting and plasticizing modules of injection molding machines, shoemaking equipment, complete hydraulic power units for packaging winding machines

Hydraulic Systems for Light Construction Machinery

Travel mechanisms of sweepers and sightseeing vehicles, micro drilling rigs, power sources for light hydraulic winches

Hydraulic Systems for General Industry

Machine tool feed mechanisms, light-duty conveyors, environmental sanitation equipment, light hoisting devices for ports

7. Installation & Commissioning Tips for Hydraulic Systems

1. Popular flanges: 2-hole diamond flange with 82.55mm positioning shoulder, 4-hole square flange with 80mm positioning shoulder, compatible with mounting positions of traditional OMR hydraulic systems

2. Common output shafts: φ25 keyed shaft, 25-series rectangular splined shaft, with outstanding interchangeability

3. An external drain port must be connected when the backpressure of the hydraulic system exceeds 5MPa or series circuits are adopted, to avoid seal breakdown caused by excessive internal pressure

4. New motors need 30–60 minutes no-load running-in at 40% of the rated pressure of the hydraulic system, before gradually lifting to full-load operation

Full English Copy for Foreign Trade Promotion (Deeply Embedded Core Keywords)

BM2 Cycloidal Motor | Premium Hydraulic Orbit Motor for Versatile Hydraulic System Deployment

The BM2 series is a compact axial-distribution hydraulic orbit motor with low-speed high-torque output, fully interchangeable with Danfoss OMR, Eaton 103 and JS series. It acts as a core power component for diversified hydraulic system layouts across multiple industries.

Core Advantages

- Advanced axial spool distribution greatly reduces startup pressure, achieves ultra-stable low-speed rotation and stabilizes the entire hydraulic system.

- Column-mounted gerotor pairs improve wear resistance and sustain high volumetric efficiency during long-term hydraulic system operation.

- Heavy-duty shaft seals can withstand high backpressure, allowing series and parallel connection modes in your hydraulic system.

- Modular mounting configurations (2/4-hole flanges, keyed/splined shafts, standard oil ports) simplify the renovation of your existing hydraulic system.

Technical Specifications

Displacement: 50–500 mL/r; continuous pressure difference: 9–14 MPa; intermittent peak torque can rise by 30%–40%. Its stable rotational speed ranges from 5 to 750 rpm, which perfectly meets the medium-light load demands of hydraulic systems in agriculture, light construction, plastic processing and general automation sectors.