10 Typical Applications Where Combined Bearings Are Used






Combined bearings are a type of bearing that integrates the properties of different types of bearings to provide enhanced performance in terms of load capacity, rigidity, and operational efficiency. They are widely used in industries where complex loads, including axial, radial, and moment loads, are present. This blog will explore ten typical applications where combined bearings are essential, along with their working principles, advantages, and examples.

1. Machine Tool Spindles

Machine tools require high precision and rigidity in their spindles to achieve accurate cutting and machining operations.

Why Combined Bearings Are Used:
  • Spindles are subjected to radial, axial, and moment loads simultaneously.
  • Combined bearings, often angular contact + radial ball bearings, can handle these loads efficiently.
  • Provide high rotational accuracy and reduce spindle vibration.
Example Applications:
  • CNC milling machines
  • Precision lathes
  • Grinding machines
Benefits:
  • Enhanced stiffness
  • Reduced deflection under heavy loads
  • Longer service life due to uniform load distribution

2. Robotics and Automation Systems

Modern robotics involves arms and joints that undergo complex movements and forces.

Why Combined Bearings Are Used:
  • Robotic joints are exposed to multi-directional loads.
  • Combined bearings, like tapered roller + angular contact bearings, offer rigidity and smooth rotation.
  • Ensure precision positioning and repeatability in robotic operations.
Example Applications:
  • Industrial robotic arms
  • Automated assembly lines
  • Pick-and-place robots
Benefits:
  • High load-carrying capacity
  • Smooth rotational motion
  • Resistance to misalignment

3. Wind Turbines

Wind turbine shafts face dynamic loading from wind variations, making bearing selection critical.

Why Combined Bearings Are Used:
  • Main shafts experience radial loads from rotor weight and axial thrust from wind.
  • Combined bearings manage simultaneous radial and axial loads effectively.
  • Enable long-term reliability in harsh outdoor conditions.
  • Example Applications:
  • Horizontal-axis wind turbines
  • Vertical-axis wind turbines
Benefits:
  • Reduced maintenance frequency
  • Enhanced efficiency of power generation
  • Ability to withstand high-speed rotation and vibration

4. Railway Axles and Wheelsets

Railway applications require bearings that can sustain high loads and shocks due to weight and track irregularities.

Why Combined Bearings Are Used:
  • Bearings must carry radial loads from axle weight and axial forces from curves.
  • Use of tapered roller bearings combined with spherical roller bearings ensures stability.
  • Maintain smooth operation under vibration and impact.
Example Applications:
  • Train wheelsets
  • Bogies
  • Locomotive axles
Benefits:
  • High load-carrying capacity
  • Smooth and stable movement on tracks
  • Longer operational life in heavy-duty environments

5. Conveyor Systems

Conveyor systems are widely used in factories, warehouses, mining operations, and logistics centers.

They transport materials, products, and heavy loads over long distances.

Why Combined Bearings Are Used

Combined bearings help support conveyor rollers that experience continuous radial loads from transported materials and axial loads from belt movement.

Benefits
  • Smooth conveyor operation
  • Reduced friction and wear
  • Lower maintenance costs
  • Increased operational efficiency
These bearings help maintain consistent and reliable material handling in industrial environments.

6. Aerospace Applications

Aircraft components, such as turbines, landing gears, and control systems, require bearings that handle extreme conditions.

Why Combined Bearings Are Used:
  • Components face radial, axial, and tilting loads.
  • Combined bearings provide high precision and durability in critical systems.
  • Light-weight designs are possible without sacrificing load capacity.
Example Applications:
  • Jet engine shafts
  • Helicopter rotor systems
  • Aircraft landing gear
Benefits:
  • Reduced maintenance in critical systems
  • High reliability under varying loads
  • Enhanced flight safety

7. Marine Propulsion Systems

Marine engines and propeller shafts face significant axial thrust and radial forces from water flow and engine torque.

Why Combined Bearings Are Used:
  • Bearings handle simultaneous axial and radial loads efficiently.
  • Use of thrust + radial roller bearings ensures smooth operation in marine environments.
  • Resistant to corrosion and shock loads.
Example Applications:
  • Ship propeller shafts
  • Marine turbines
  • Offshore equipment
Benefits:
  • Extended service life in harsh environments
  • Reduced vibration and noise
  • Efficient power transmission

8. Heavy Machinery and Construction Equipment

Excavators, cranes, and loaders operate under heavy loads with complex motion patterns.

Why Combined Bearings Are Used:
  • Bearings manage radial and axial loads from lifting, swinging, and digging operations.
  • Tapered roller + spherical roller combinations offer high durability.
  • Critical for operator safety and equipment reliability.
Example Applications:
  • Excavator swing bearings
  • Crane slewing rings
  • Loader axles
Benefits:
  • High load-bearing capability
  • Smooth motion under harsh conditions
  • Longer operational lifespan

9.Medical Equipment

Precision and reliability are essential in medical devices like MRI machines, surgical robots, and imaging equipment.

Why Combined Bearings Are Used:
  • Bearings handle axial and radial loads while maintaining precise rotation.
  • Angular contact + thrust bearing combinations ensure smooth, vibration-free operation.
  • Critical for accuracy in diagnostics and procedures.
Example Applications:
  • MRI gantry rotation
  • Surgical robots
  • X-ray imaging systems
Benefits:
  • Accurate and reliable operation
  • Noise and vibration reduction
  • Long-term precision

10. Printing and Paper Industry Machines

Printing presses and paper machines require bearings that can handle high-speed rotation and continuous multi-directional loads.

Why Combined Bearings Are Used:
  • Bearings handle radial loads from rollers and axial thrust from paper tension.
  • Combined bearings provide rigidity, smooth operation, and reduced maintenance.
  • Support high-speed production without downtime.
Example Applications:
  • Printing press rollers
  • Paper mill calenders
  • Coating and laminating machines
Benefits:
  • Smooth, precise operation
  • High load-bearing capacity
  • Reduced wear and maintenance costs
  • Advantages of Using Combined Bearings
  • Multi-Load Handling: Handles radial, axial, and moment loads simultaneously.
  • Enhanced Rigidity: Provides better stiffness for precision machinery.
  • High Durability: Uniform load distribution increases bearing life.
  • Reduced Maintenance: Less frequent replacements due to superior design.
  • Vibration Resistance: Smooth operation reduces machine vibration.

Conclusion

Combined bearings are critical components across industries where complex load conditions exist. Their ability to handle simultaneous radial and axial forces, along with high stiffness and durability, makes them indispensable in applications ranging from machine tools to aerospace, marine, and heavy machinery. Selecting the right type of combined bearing for each application ensures operational efficiency, precision, and longevity, ultimately improving performance and reducing downtime.
For industries aiming to maximize reliability and reduce maintenance costs, investing in high-quality combined bearings is a strategic choice that delivers both technical and financial benefits.

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