BH Hydraulic Orbital Motor

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3 year

Product details

1. Product Overview

• Definition:

TheBH Hydraulic Orbital Motoris a low-speed, high-torque hydraulic actuator based on cycloidal gearing principles. It converts hydraulic energy (pressure and flow) into mechanical energy (rotary motion) through the engagement of an internal gear ring and an external rotor. The term "Orbital" highlights the eccentric orbital motion of the rotor around the central axis.

• Series Features:

The BH series is typically optimized for specific operating conditions, such as high starting torque, resistance to shock loads, and long service life, making it suitable for direct-drive heavy-load applications.

2. Core Structure and Working Principle

• Cycloidal Gear Pair:

• Internal Gear Ring: Fixed to the motor housing with a short-amplitude internal cycloidal tooth profile.

• External Rotor: Eccentrically mounted with a short-amplitude external cycloidal tooth profile, meshing with the internal gear ring.

• Motion Mechanism: The rotor orbits eccentrically around the central axis while rotating, enabling hydraulic oil intake and discharge through tooth-space volume changes.

• Valve Plate Mechanism:

Employs axial or radial valve plates to switch high-pressure oil and return oil paths based on rotor position, driving continuous rotation.

• Bearing System:

Equipped with high-load needle bearings or sliding bearings to support eccentric rotor motion, ensuring low friction and high reliability.

3. Technical Parameters and Performance Metrics

• Typical Parameter Ranges:【表格】

Parameter Range

Displacement 10 cm³/rev ~ 500 cm³/rev

Rated Pressure 16 MPa ~ 25 MPa

Peak Pressure 20 MPa ~ 30 MPa

Speed 0 ~ 1000 rpm (low-speed type)

Torque (Continuous) 50 Nm ~ 5000 Nm

• Performance Advantages:

• High Starting Torque: Up to 90% of rated torque, ideal for heavy-load startups.

• Low-Speed Stability: Smooth output below 50 rpm.

• Volumetric Efficiency: Typically ≥85%, minimizing energy loss.

• Contamination Resistance: Cycloidal tooth profiles tolerate lower oil cleanliness than piston motors.

4. Selection and Matching Guidelines

• Load Matching:

Select displacement based on torque requirements to ensure sufficient output under rated pressure.

Example: For a 1000 Nm load, choose a 200 cm³/rev model at 20 MPa (theoretical torque ≈ 200 × 20 × π/20 ≈ 628 Nm; include safety margin).

• Speed Requirements:

Prioritize single-row cycloidal motors for low-speed applications (<200 rpm); use double-row designs or reducers for higher speeds.

• Environmental Adaptability:

• Cold climates: Use low-temperature hydraulic oil (for startups below -30°C).

• Dusty environments: Enhance sealing (e.g., dual-lip seals).

5. Application Scenarios

• Construction Machinery:

• Excavator slewing mechanisms, crane winches, road roller vibration drums.

• Agricultural Machinery:

• Combine harvester drive wheels, forage chopper cutters, seed drill openers.

• Industrial Equipment:

• Injection molding machine clamping units, die-casting machine mold closing mechanisms, rubber mixing mill rotors.

• Marine Equipment:

• Steering gears, windlasses, deck machinery.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

Audited supplier

3 year

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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