JFK Combined needle roller bearings
JFK rolling bearings
- Radial and axial loads
- Bidirectional
- Without axial clearance
Combined bearings integrate a radial needle roller cage and one or two axial cylindrical roller cages into a single component. This design allows the simultaneous support of radial forces, bidirectional axial forces, and tilting moments. This compact single-element solution eliminates the need to combine separate radial and axial bearings, reducing axial dimensions and simplifying the design.
JFK Group offers combined bearings in screw-mounted and non-screw-mounted versions, pre-adjusted with zero axial clearance. The screw-mounted version allows the bearing to be directly screwed to the supporting structure through the thread on the outer ring, while the non-screw-mounted version requires a dedicated housing. Available with flanged or cylindrical outer ring.
Combined needle roller bearings are typically used in machine tools, positioning systems, and applications requiring the management of combined loads within a reduced installation space.
Versions
How to choose the right combined bearing
The choice mainly depends on the mounting method and the available housing.
Screw-mounted version
External thread on the outer ring · Direct mounting · Simplified installationOuter ring with external thread, allowing the bearing to be screwed directly onto the supporting structure. Simplifies installation by eliminating the need for a dedicated housing with precise tolerances. Pre-adjusted with zero axial clearance.
Non-screw-mounted version
Cylindrical or flanged outer ring · Dedicated housing · High precisionCylindrical or flanged outer ring for mounting in a dedicated housing. Pre-adjusted with zero axial clearance. Suitable for applications requiring higher positioning accuracy or where screw mounting is not feasible.
Performances
Design and performance features
Integrated radial needle roller cage and axial cylindrical roller cages for combined loads in a single compact element, pre-adjusted with zero axial clearance.
Radial loads, bidirectional axial loads and tilting moments
The combination of a radial needle roller cage and axial cylindrical roller cages allows the bearing to simultaneously support radial loads, axial loads in both directions, and tilting moments in a single component.
Pre-adjusted with zero axial clearance
Radial-axial combined bearings are factory pre-adjusted with zero axial clearance, ensuring consistent and repeatable performance without the need for adjustment during installation.
Compact solution, replacing two separate bearings
The integration of radial and axial functions into a single component in radial-axial combined bearings reduces installation space and simplifies the design compared to the use of separate bearings.
Screw-mounted or housing-mounted
The screw-mounted version allows direct fixing through the thread, while the non-screw-mounted version requires a housing with suitable tolerances.
Flanged or cylindrical
Available with a flanged outer ring for flange mounting or a cylindrical outer ring for housing mounting.
Mounting
Mounting of combined needle roller Bearings
Combined bearings are pre-adjusted with zero axial clearance and do not require adjustment during mounting. The screw-mounted version is installed by screwing the outer ring onto the supporting structure; the non-screw-mounted version is installed in the housing by press fitting or with an interference fit.
Mounting methods
- Installation of the screw-in versionScrew the bearing onto the supporting structure using the thread on the outer ring. No dedicated housing is required. Verify the correct tightening torque to ensure precise positioning.
- Installation of the non-screw-in versionInstall the bearing in the dedicated housing by press fitting or with an interference fit, applying the mounting force to the outer ring. The housing must comply with the required dimensional tolerances.
Technical data
- Axial clearance
- Pre-adjusted with zero clearance
- Screw-mounted version fixing
- Thread on the outer ring
Applications
Applications
Components and application support for every industrial environment.
Industrial automation
Automated machinery with combined radial and axial loads in reduced installation spaces. The factory pre-adjusted zero axial clearance ensures positioning accuracy and consistent performance during continuous operation.
Metal Fabrication / Machining Industry
Machine tools and positioning systems with combined loads. The screw-mounted version simplifies installation and replacement in production environments.
Transmissions and axles
Compact transmission systems with combined radial and axial loads where the use of separate bearings would require excessive axial space.
Construction Equipment
Handling systems with combined loads and tilting moments under demanding operating conditions. The integration into a single component reduces the number of potential structural failure points.
Automotive / Motorcycles, Trucks & Buses
Components for suspension, transmission and linkage systems designed for intensive duty cycles, vibration and compact spaces.Technical documents
Contacts
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