JFK Drawn Cup Needle Roller Bearings
JFK Needle Roller Bearings
- Thin cross-section
- High speed
- Easy installation
Drawn cup needle roller bearings, also known as cup-type needle roller bearings, feature a thin-walled stamped steel outer ring with an integrated needle roller and cage assembly. The thin outer ring minimizes radial space requirements while maintaining good load capacity, making them suitable for applications where space is limited and rotational speeds are higher compared to typical NK/NKI needle roller bearing applications.
JFK Group offers drawn cup needle roller bearings in two main versions: open on both sides (HK series) and closed on one side (BK series), for end-of-shaft support applications. Every JFK drawn cup needle roller bearing is supplied with standard lithium-based grease lubrication, suitable for operating temperatures from –30°C to +110°C. As with needle roller cages, the shaft surface acts as the inner raceway and must be hardened and ground with suitable tolerance and roughness values.
Versions
Two versions: how to select the right drawn cup needle roller bearing
The choice depends primarily on whether or not a shaft end support is needed.
Open drawn cup needle roller bearings on both sides - HK Series
Open on both sides · Intermediate supportThe standard version. Outer ring open on both sides, suitable for intermediate shaft support applications. The needle rollers run directly on the shaft surface, which must be hardened and ground. Supplied with standard lithium-based grease lubrication.
Closed-end drawn cup needle roller bearings - BK Series
Closed on one side · End-of-shaft supportOuter ring closed on one side for end-of-shaft support applications. Same structure as the HK Series, with the difference that one side of the outer ring is closed, allowing the bearing to be positioned at the end of the shaft. Supplied with standard lithium-based grease lubrication.
Performances
Design and performance features
Thin-walled stamped steel outer ring for minimum radial section and higher speeds compared to NK/NKI needle roller bearings.
High radial load capacity
The linear contact between the needle rollers and raceways ensures high radial load capacity despite the thin outer ring section. Suitable for applications requiring significant radial loads in limited spaces.
Minimum radial cross-section
The thin-walled stamped outer ring minimizes radial space requirements, making these bearings suitable for applications where space is the primary design constraint.
Higher than that of NK/NKI bearings
Thanks to their stamped outer ring design, drawn cup needle roller bearings allow higher rotational speeds compared to NK/NKI needle roller bearings, while remaining suitable for low and medium speed applications.
Lithium-based grease · –30°C/+110°C
Supplied with standard lithium-based grease lubrication, suitable for operating temperatures from –30°C to +110°C. Under normal operating conditions, no relubrication is required throughout the entire service life.
Hardened and ground
The shaft surface acts as the inner raceway and must be hardened and ground with suitable tolerance and roughness values to ensure the expected performance.
Open (HK) or closed-end (BK)
The HK Series is open on both sides for intermediate shaft support applications, while the BK Series is closed on one side for end-of-shaft support applications.
Mounting
Mounting of Drawn Cup Needle Roller Bearings
Drawn cup needle roller bearings are mounted in the housing with an interference fit. The shaft surface must be hardened and ground before mounting. Lubrication is ensured by the standard lithium-based grease supplied with the bearing; no relubrication is required under normal operating conditions.
Mounting methods
- Press fitting into the housingThe drawn cup needle roller bearing is press fitted into the housing, with the mounting tool applying the force to the outer ring. Before mounting, verify that the shaft surface meets the required tolerance and roughness specifications.
- BK Series: end-of-shaft mountingFor the closed-end version, the closed side must be positioned towards the end of the shaft to ensure correct axial support of the component.
Technical data
- Temperature with standard grease
- −30 °C to +110 °C
- Standard lubricant
- Lithium-based grease
- Shaft surface
- Hardened and ground
Applications
Applications
Components and application support for every industrial environment.
Industrial automation
Compact applications with high radial loads and higher speeds compared to typical NK/NKI needle roller bearing applications. Lifetime lubrication reduces maintenance requirements in systems operating with continuous duty cycles.
Transmissions and axles
Compact transmission systems with significant radial loads where the thin outer ring section is the key factor in selecting drawn cup needle roller bearings over NK/NKI needle roller bearings.
Metal Fabrication / Machining Industry
Machine tools with high radial loads in limited spaces and higher rotational speeds. The BK Series is particularly suitable for supporting shafts at their ends.
Agriculture
Transmission systems on agricultural machinery where ease of mounting and lifetime lubrication reduce maintenance requirements in field operations.
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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