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Hydraulic motors are widely applied in agriculture machinery, fishing machinery, plastic industry, mining, and construction machinery, especially fitted to lower load applications, such as plastic injection mold machine, cleaner, grass cutter, etc.
1. Special dynamic seal can bear high back pressure
2. Variety mounting of flange, output shaft, and port.
3. Small volume, smart structure
4. Low leakage, no noisy
BMM-32 Hydraulic Orbit Motor Technical Overview
Model Definition:
• BMM: Series code (common in brands like Bosch Rexroth, Parker)
• 32: Displacement indicator (unit: cm³/rev, i.e., 32 mL per revolution)
I. Core Structure & Operating Principle
1. Orbital (Gerotor) Design
• Utilizes aninternal gear ring (stator)andexternal gear (rotor)with eccentric meshing to create sealed volume changes.
• Hydraulic pressure drives the rotor to revolve around the stator’s center (orbital motion) while rotating on its own axis to output torque.
• Advantages: Compact size, high low-speed stability (minimum stable speed: 5–10 rpm).
2. Key Components
• Port Plate: Distributes high-pressure oil and return oil for unidirectional rotation.
• Bearing System: Double-row roller bearings handle axial/radial loads (lifespan ≥5,000 hours).
• Housing Material: High-strength aluminum alloy (e.g., A356.2-T6), lightweight and pressure-resistant (rated pressure: 25 MPa, peak pressure: 35 MPa).
II. Core Performance Parameters
【表格】
Parameter BMM-32 Typical Value Unit Explanation
Displacement 32 cm³/rev Theoretical oil output per revolution
Rated Pressure 25 MPa Maximum continuous operating pressure
Peak Pressure 35 MPa Short-term overload pressure (≤10s)
Rated Speed 3,000 rpm Maximum allowable rotational speed
Min. Stable Speed 10 rpm Avoids crawling phenomena
Rated Torque 120 N·m Output torque at 25 MPa (T=ΔP×V/2π)
Volumetric Efficiency ≥92% % Internal leakage control
Mechanical Efficiency ≥88% % Friction loss control
Weight 8.5 kg Includes shaft seal
III. Typical Application Scenarios
1. Construction Machinery
• Excavator Travel Drive: Replaces mechanical gearboxes for stepless speed control.
• Crane Slew Drive: Low-speed, high-torque output for smooth starting/stopping.
• Road Roller Vibration Drum: High-frequency vibration (1,500–3,000 rpm) and low-frequency compaction (500 rpm).
2. Industrial Equipment
• Injection Molding Machine Clamping Unit: Precise control of mold opening/closing speed and pressure.
• Die-Casting Machine: High-pressure, slow-speed injection (5–50 mm/s).
• Mixer Drive: Constant torque output for viscous materials.
3. Agricultural Machinery
• Combine Harvester Header Lifting: Proportional height control (±2% accuracy).
• Forage Harvester Feed Roller: Variable-speed adjustment for material flow.
IV. Selection & Matching Guidelines
1. Displacement Calculation
• Required displacementV=T×2πΔP×ηm V = \frac{T \times 2\pi}{\Delta P \times \eta_m} V=ΔP×ηmT×2π
(T: Required torque, ΔP: System pressure differential, ηm: Mechanical efficiency)
• Example: For 150 N·m torque and 20 MPa pressure differential, \( V \geq \frac{150 \times 2\pi}{20 \times 0.88} \approx 53.7 \, \text{cm³/rev} \). Select BMM-50 or larger.
2. Pressure Matching
• System maximum pressure ≤ Motor peak pressure (35 MPa), and continuous pressure ≤ Rated pressure (25 MPa).
3. Speed Matching
• Maximum speed ≤ Motor rated speed (3,000 rpm) to avoid bearing damage from overspeed.
4. Mounting Options
• Shaft End Types: Spline shaft (SAE J1926), keyed shaft, or flange connection.
• Rotation Direction: Unidirectional or reversible (requires port plate adjustment).
V. Common Failures & Maintenance
1. Low Output/Crawling
• Causes: Hydraulic oil contamination (NAS≥8), port plate wear, bearing seizure.
• Solutions: Replace filters (≤10 μm), clean motor internals, replace seals.
2. Leakage
• Shaft Seal Leakage: O-ring aging or excessive axial clearance (adjust bearing preload).
• Housing Leakage: Cracks or gasket damage (replace housing/gasket).
3. Abnormal Noise
• Cavitation: Restricted suction line or high oil viscosity (check suction filter, use ISO VG46 oil).
• Gear Wear: Metal particles in oil (enhance filtration, conduct regular oil analysis).
VI. Brand & Alternative Models
【表格】
Brand Alternative Model Key Differences
Bosch Rexroth MCR-032 Integrated brake option, IP69K rating
Parker F12-032 Optimized low-speed performance (5 rpm min.)
Eaton 6K-032 Shock-resistant design for mining equipment
Danfoss OMR-032 Lightweight design (15% weight reduction)
VII. Technical Upgrade Trends
1. Smart Integration: Built-in pressure/speed sensors with CAN bus communication.
2. Efficiency: Advanced friction materials (e.g., tungsten carbide coating) boost mechanical efficiency to 92%.
3. Eco-Friendly: Compatibility with biodegradable hydraulic oils (HEES/HEPG), REACH-compliant.
