hydraulic oribit motor
2 month ago
Product details
Hydraulic Orbit Motor (Orbital Motor) Technical Overview
1. Definition & Working Principle
Ahydraulic orbit motor(orbital motor) is a type of low-speed, high-torque (LSHT) hydraulic motor that converts hydraulic pressure into mechanical rotation through anorbital motion mechanism. Unlike conventional gear or vane motors, it uses agerotor(internal gear) design where the outer rotororbitsaround a fixed center gear, creating multiple displacement chambers for torque generation.
• Key Features:
• High Starting Torque: Ideal for heavy-load applications (e.g., winches, excavators).
• Compact Size: Smaller than equivalent-torque radial piston motors.
• Bidirectional Operation: Reversible rotation via valve switching.
• Variable Displacement Options: Some models allow displacement adjustment for speed/torque control.
2. Core Components & Function
【表格】
Component Function Design Highlights
Stator (Fixed Gear) Forms the outer housing and defines the orbital path. High-strength alloy steel with hardened teeth (HRC58-62).
Rotor (Orbiting Gear) Revolves around the stator, creating variable-volume chambers. Matched tooth profile with stator for minimal leakage.
Drive Shaft Transmits torque to the load. Splined or keyed connection; supported by high-load bearings.
Port Plate Directs hydraulic fluid into/out of chambers. Precision-machined to ±0.01mm for volumetric efficiency.
Valve Plate Controls fluid flow direction (bidirectional operation). Optional for reversible models; may include pressure relief features.
Shaft Seals Prevents oil leakage. Lip seals or mechanical face seals (for high-pressure applications).
3. Working Mechanism
1. Intake Phase: High-pressure oil enters chambers between the stator and rotor teeth, pushing the rotor to orbit.
2. Expansion Phase: As the rotor orbits, chamber volumes increase, generating torque.
3. Exhaust Phase: Spent oil exits through the outlet port as the chambers decrease in volume.
4. Orbital Motion: The rotor’s eccentric movement (offset from the stator’s center) creates continuous rotation.
4. Key Performance Metrics
【表格】
Metric Typical Range Significance
Displacement (cc/rev) 25–1,000+ cc/rev Directly proportional to torque output.
Max. Pressure 200–350 bar Higher pressure = higher torque (e.g., 350 bar yields ~2x torque vs. 200 bar).
Max. Speed 100–500 RPM Limited by internal leakage and mechanical friction.
Efficiency 75–85% (overall) Lower than piston motors but higher than gear motors in LSHT applications.
Starting Torque 1.2–1.8× rated Critical for overcoming inertial loads (e.g., starting a winch drum).
5. Applications
• Mobile Equipment: Winches, augers, sweeper drives, and tracked vehicle propulsion.
• Industrial Machinery: Mixer drives, conveyor systems, and drilling rigs.
• Marine: Anchor windlasses, deck machinery, and steering systems.
• Aerospace: Actuation systems (less common due to weight constraints).
6. Advantages vs. Alternatives
【表格】
Comparison Orbit Motor Gear Motor Piston Motor
Torque Density High (best for LSHT) Medium Medium-High (better at high speeds)
Efficiency 75–85% 65–75% 85–95%
Speed Range Low (50–500 RPM) Medium (500–3,000 RPM) High (500–10,000 RPM)
Cost Moderate Low High
Maintenance Low (fewer moving parts) Lowest Higher (due to complex valves)
7. Selection Criteria
• Torque Requirements: Choose displacement based on load inertia and duty cycle.
• Pressure Rating: Ensure the motor’s max. pressure exceeds system working pressure by 20%.
• Speed Needs: For high-speed applications (>500 RPM), consider a gear motor or high-speed orbit variant.
• Environment: Opt for corrosion-resistant materials (e.g., stainless steel shafts) for marine/offshore use.
• Mounting: Standard SAE/ISO flanges or custom mounts for integration.
8. Common Failures & Troubleshooting
【表格】
Failure Mode Root Cause Solution
Low Torque/Speed Internal leakage (worn seals/gears) Replace seals; inspect gear tooth wear.
Excessive Noise Cavitation (low oil level/high speed) Increase oil supply; reduce speed.
Shaft Seal Leakage Worn lip seals or high backpressure Replace seals; install pressure relief.
Overheating Insufficient cooling/high friction Check oil cooler; verify viscosity grade.
9. Recent Innovations
• High-Efficiency Designs: Dual-pressure compensators reduce losses by 15%.
• Compact Integrations: Motors with built-in brakes or valves for simplified systems.
• Advanced Materials: Ceramic-coated gears extend life in abrasive environments.
• Smart Sensors: Embedded pressure/temperature sensors for predictive maintenance.
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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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