► Finer | IKO - Combined Type NRB

Compact Bearings for Combined Radial & Axial Load Applications

Not every bearing is designed to control loads coming from multiple directions at the same time. Modern automation equipment, indexing mechanisms, machine tools, hydraulic systems & precision assemblies frequently generate both radial loads acting across the shaft & axial loads acting along the shaft. Selecting separate bearings for each load direction increases component count, assembly size & installation complexity, making integrated bearing solutions a smarter engineering choice.

Finer IKO Combined Type Needle Roller Bearings (Combined Type NRB) are compact bearing units engineered to support radial & axial loads simultaneously within a single assembly. By integrating a precision needle roller bearing with either a thrust ball bearing or thrust roller bearing, these bearings provide accurate shaft guidance while reducing installation space & simplifying mechanical design.

Unlike conventional bearing arrangements that require multiple components to perform separate functions, combined type needle roller bearings deliver an integrated load path that improves shaft location, enhances axial guidance & maintains excellent radial support. Their compact construction makes them particularly suitable for applications where installation space is restricted but precision, rigidity & long-term reliability remain essential.

Complete bearing assemblies commonly incorporate IKO Inner Rings to provide hardened raceways where required, Metric Series NBR Oil Seals to retain lubrication while preventing contamination & Bearing Accessories to support accurate installation, servicing & ongoing maintenance.

From robotics, CNC machinery & servo-driven positioning systems through to packaging equipment, indexing tables, transfer mechanisms, medical equipment & advanced manufacturing lines, Finer IKO Combined Type Needle Roller Bearings deliver dependable performance wherever compact, multi-directional load support is required.

Why Choose Finer IKO Combined Type Needle Roller Bearings?

Reducing machine size without reducing performance has become a major objective across modern engineering. Combined type needle roller bearings help achieve this by replacing multiple bearing components with one integrated assembly capable of handling complex loading conditions.

Finer IKO Combined Type Needle Roller Bearings provide:

► Combined radial & axial load support.
► Compact integrated bearing design.
► High radial load capacity.
► Reliable axial guidance.
► Precision shaft location.
► Excellent bearing rigidity.
► Reduced assembly complexity.
► High positional accuracy.
► Smooth rolling performance.
► Long operating life.
► Efficient space utilisation.
► Trusted IKO engineering quality.

Key Advantages

✔ Supports two load directions simultaneously.
✔ Reduces component count.
✔ Simplifies mechanical assemblies.
✔ Improves equipment compactness.
✔ Excellent positioning accuracy.
✔ Ideal for precision machinery.

How A Combined Type Needle Roller Bearing Works?

Think of a combined bearing as two specialised bearings working together within one compact housing. Rather than installing separate components for radial support & axial location, both functions are integrated into a single precision-engineered bearing assembly.

Inside the bearing:

► Needle rollers support radial loads.
► The thrust bearing supports axial loads.
► The raceway maintains accurate roller guidance.
► The integrated design simplifies shaft location.
► Fewer individual components are required.
► Assembly time is reduced.
► Overall machine compactness is improved.

Because both bearing functions operate together, the shaft remains accurately supported during changing operating loads while reducing the overall footprint of the machine.

Why Choose A Combined Bearing Instead Of Separate Bearings?

Every additional component increases assembly time, inventory requirements & future maintenance. Combined type needle roller bearings eliminate unnecessary complexity by integrating multiple bearing functions into one compact unit.

This engineering approach helps:

► Reduce assembly size.
► Simplify installation.
► Improve shaft alignment.
► Increase axial stiffness.
► Improve load distribution.
► Reduce component inventory.
► Simplify maintenance planning.

For OEM machine builders, automation designers & maintenance engineers, fewer components often translate into faster assembly, easier servicing & greater long-term reliability.

Understanding Radial Load & Axial Load

Successful bearing selection starts with understanding the direction of the forces acting on the shaft.

What Is Radial Load?

Radial load acts perpendicular to the shaft centreline. Examples include belt tension, gear mesh forces, pulley loads & chain drive loads.

What Is Axial Load?

Axial load acts parallel with the shaft centreline. Examples include thrust generated by lead screws, helical gears, indexing mechanisms & positioning systems.

Combined type needle roller bearings are specifically engineered for applications where both loading directions occur simultaneously.

Common Applications

Compact precision machinery often creates the greatest engineering challenges. Combined type needle roller bearings help solve those challenges by supporting complex loading conditions within limited installation space.

Typical applications include:

► Servo actuators.
► Robotic joints.
► Rotary indexing tables.
► CNC tool changers.
► Transfer mechanisms.
► Packaging indexers.
► Pick-&-place systems.
► Cam drive mechanisms.
► Textile machinery.
► Medical equipment.
► Precision automation.
► Industrial gearboxes.

Industry Example – Robotic Automation

Robotic arms continuously accelerate, decelerate & change direction while generating both radial & axial forces. Combined bearings maintain accurate shaft guidance throughout repeated motion cycles.

Industry Example – Packaging Indexing Systems

Packaging equipment relies on accurate indexing to maintain product spacing, labelling accuracy & production consistency. Integrated bearing assemblies help reduce machine size while maintaining positioning accuracy.

Industry Example – CNC Tool Changers

Automatic tool changers depend on compact bearing arrangements capable of maintaining accurate shaft location while supporting repeated indexing operations throughout continuous production.

Machine builders specifying fastening hardware for precision equipment may also benefit from Fastener Guide: Bolts, Screws & Anchors when selecting appropriate fastening solutions for machinery assembly.

Product Selection Guide

Selecting the correct combined bearing requires evaluating the complete mechanical system rather than simply matching dimensions.

Radial & Axial Load Ratio

Determine how much radial loading & axial loading will occur during normal operation.

Shaft Hardness

Where the shaft acts as a bearing raceway, appropriate hardness helps maximise bearing performance.

Raceway Accuracy

Accurate raceways contribute to improved roller guidance & longer bearing life.

Housing Accuracy

Correct housing tolerances help maintain bearing alignment while supporting accurate shaft positioning.

Lubrication Method

Choose grease or oil lubrication according to operating speed, temperature & maintenance strategy.

Operating Speed

Review rotational speed together with dynamic loading conditions.

Working Environment

Consider:

► Dust.
► Moisture.
► Contamination.
► Operating temperature.
► Washdown requirements.
► Continuous operating duty.

Where tapered shaft arrangements require accurate mounting, compatible FYH Adapter Sleeves help simplify bearing installation while maintaining dependable shaft location.

Expert Tips

Experienced machine designers know that integrated bearing assemblies deliver their greatest advantages when the surrounding components are manufactured with equal precision.

For dependable long-term performance:

✔ Confirm shaft tolerances before installation.
✔ Inspect housing bores for dimensional accuracy.
✔ Keep bearings sealed until installation.
✔ Lubricate according to the application requirements.
✔ Replace worn oil seals during bearing replacement.
✔ Inspect thrust faces for wear.
✔ Monitor operating temperatures after commissioning.
✔ Investigate abnormal vibration before bearing damage progresses.

Production facilities maintaining precision automation equipment may also benefit from Winter-Proofing Your Tools: Maintenance Tips for the Cold Months when preparing workshop assets for changing operating conditions.

How Combined Type Needle Roller Bearings Fit Within Precision Machinery?

Every precision drivetrain depends on each component performing a specific mechanical role within the overall system.

A typical assembly follows this sequence:

Servo Motor → Shaft → IKO Combined Type Needle Roller Bearing → Housing → Indexing Mechanism → Coupling → Driven Equipment

Within this assembly, the bearing helps:

► Support radial loads.
► Control axial movement.
► Maintain shaft location.
► Improve positioning accuracy.
► Reduce mechanical complexity.
► Increase equipment reliability.

Understanding how bearings interact with shafts, housings, lubrication systems, seals & positioning mechanisms helps engineers design more reliable automation systems while simplifying future maintenance.

IKO Combined Type Needle Roller Bearings Compared With Other Bearing Types

Selecting the correct bearing depends on load direction, shaft guidance requirements, available installation space, lubrication method & overall machine design rather than choosing the same bearing for every application.

Installation Best Practices

Precision bearings deliver precision results only when every installation step is completed correctly. Taking extra care during assembly helps preserve bearing geometry, maintain accurate shaft guidance & achieve the service life expected from an IKO Combined Type Needle Roller Bearing.

For dependable installation:

► Confirm the bearing matches the shaft, housing & load requirements.
► Measure shaft & housing tolerances before assembly.
► Keep the bearing in its protective packaging until required.
► Lubricate the rolling elements using the recommended lubricant.
► Apply installation force only to the correct mounting surface.
► Verify the thrust section is correctly orientated.
► Rotate the shaft manually to confirm smooth movement.
► Inspect axial movement before placing the machine into service.

Following these practices reduces the risk of installation damage while supporting reliable long-term performance.

Common Causes Of Bearing Failure

Failures rarely occur without an underlying mechanical reason. Identifying the source of a problem helps maintenance teams eliminate repeat breakdowns instead of simply replacing components.

Understanding why a bearing failed often prevents unnecessary downtime during future maintenance cycles.

Preventative Maintenance

Well-planned inspections protect far more than the bearing itself. Monitoring surrounding components helps maintain the accuracy of the complete rotating assembly while reducing the likelihood of unexpected production interruptions.

A practical maintenance schedule should include:

Lubrication Quality

Inspect grease or oil condition for contamination, degradation or insufficient coverage.

Axial Movement

Measure shaft end float to ensure the bearing continues providing accurate axial guidance.

Housing Condition

Inspect the housing bore for wear, distortion or damage that could affect bearing performance.

Sealing Performance

Check oil seals regularly for lubricant leakage or contaminant ingress.

Condition Monitoring

Review vibration, temperature & operating noise trends to identify developing problems before they become major failures.

Where sealing components are replaced during scheduled maintenance, compatible Metric Series NBR Oil Seals help maintain lubricant retention while protecting precision bearing assemblies from contamination.