High-Performance Solutions for Compact and Demanding Applications

Needle roller bearings and combined needle roller bearings are essential components in high-load, space-constrained industrial systems. These bearings offer a compact design, exceptional load-carrying capabilities, and flexibility for complex applications.

Needle Roller Bearings

Needle roller bearings are ideal for applications requiring high radial load support with minimal radial space. They are often used where shafts can serve as raceways, enabling direct bearing arrangements and simplified assembly.

Key Benefits:

• Support high radial loads

• Very small radial design envelope

• High running accuracy

• Capable of high speeds when cage-guided

• Easy to mount and dismount

Combined Needle Roller Bearings

Combined needle roller bearings consist of a radial needle bearing and an axial bearing component, offering support for both radial and axial loads in a single unit. They are ideal for locations with limited installation space.

Types Include:

• Needle roller/axial deep groove ball bearings (NX, NKX)

• Needle roller/axial cylindrical roller bearings (NKXR)

• Needle roller/angular contact ball bearings (NKIA, NKIB)

Advantages:

• Axially rigid bearing arrangements

• Compact solutions for limited-space applications

• Suitable for high radial and moderate to high axial loads

• Cage-guided variants support higher speeds

• X-life versions offer longer operating life and reduced friction

Design Considerations

Most combined needle roller bearings are available in versions with or without inner rings, end caps, and various lubrication options. Some are self-retaining (with end caps), while others require separate mounting of components.

Lubrication Options:

• Oil lubrication for NX, NKX

• Grease lubrication for NX..-Z, NKX..-Z, NKXR..-Z

Materials and Durability:

• Steel or polyamide cages

• Through-hardened or case-hardened raceways

• Operating temperature range: −30°C to +120°C

Technical Data & Performance

• Dynamic load ratings provided separately for radial and axial components

• Support for preload arrangements using disc springs

• Axial guidance possible in both directions with mirrored bearing setups

Use Cases

• Multi-spindle drilling machines

• Agricultural and construction machinery

• Industrial gearboxes

• Compact mechanical assemblies

Illustration: Load Directions

• Fr = radial load

• Fa = axial load

Load direction comparison diagrams:

Summary

Needle roller and combined needle roller bearings are a highly efficient solution for compact machinery and demanding load conditions. Whether you need precise radial support, additional axial capacity, or compact bearing systems, these bearings offer the versatility and durability your systems require.

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