JFK Cylindrical roller bearings
JFK roller bearings
- High load capacity
- High radial load capacity
- Separable
Cylindrical roller bearings are separable radial bearings featuring cylindrical rollers as rolling elements. The line contact between rollers and raceways provides a substantially higher radial load capacity than ball bearings, while offering limited axial load capacity. The various designs, differing in the arrangement of the bearing ribs, allow the appropriate level of axial locating to be selected according to the application requirements, from free axial displacement to axial fixation in both directions.
JFK Group offers single-row and double-row cylindrical roller bearings. The single-row range includes N, NU, NJ and NUP designs, as well as special RN and RNU designs without an outer or inner ring. The double-row full complement design is suitable for very high radial loads at low and medium rotational speeds and is available in the NNCL, NNCF, NNC and NNF50 series. Cylindrical roller bearings are widely used in transmissions, mechanical presses, electric motors, pumps, compressors and steel industry applications.
Versions
How to Choose the Right Cylindrical Roller Bearing
The selection between single-row and double-row designs mainly depends on the required load capacity and operating speed. Both versions feature a separable design and are available in various axial locating configurations.
Single-row cylindrical roller bearings
Available in four main designs: N design: two ribs on the inner ring, allowing free axial displacement in both directions. NU design: two ribs on the outer ring, allowing free axial displacement in both directions. NJ design: two ribs on the outer ring and one rib on the inner ring, providing axial location in one direction. NUP design: two ribs on the outer ring, one integral rib and one loose rib on the inner ring, providing axial location in both directions. Special RN (without outer ring) and RNU (without inner ring) designs are also available for hardened and ground raceways machined directly on the shaft or housing. Cages are available in polyamide 6.6 (TVP) or solid brass (M). High radial load capacity · Various axial locating configurations · Separable design
Double-row full complement cylindrical roller bearings
The maximum number of rollers is accommodated within the available space to achieve the highest possible radial load capacity. Suitable for low to medium rotational speeds. Available in NNCL designs (free axial displacement), NNCF designs (axial location in one direction), NNC designs (axial location in both directions) and NNF50-2LS-V designs (seals on both sides, relubricatable). The rings are equipped with lubrication grooves and relubrication holes. Maximum radial load capacity · Full complement design · Low and medium rotational speeds
Performances
Design and performance features
The line contact between rollers and raceways provides high radial load capacity and structural rigidity across a wide range of designs.
Tolerances
Normal (PN) as standard Products are supplied with Normal tolerance class (PN) as standard. P6 and P5 tolerance classes are available upon request.
Load
High radial load capacity The line contact between rollers and raceways ensures a substantially higher radial load capacity than ball bearings. For JFK Group, the minimum required load is 2% of the dynamic load rating (4% for full complement designs).
Axial locating arrangement
Configurable by design The arrangement of the bearing ribs defines the axial locating capability: from free axial displacement (N, NU), to axial location in one direction (NJ), or in both directions (NUP). This flexibility allows cylindrical roller bearings to be adapted to different mounting configurations.
Speed
Medium to high speeds · Single-row version The caged single-row version is suitable for medium to high operating speeds, while the full complement version is designed for low to medium rotational speeds. The minimum required load must be maintained, especially at high speeds.
Internal clearance
CN internal clearance as standard; C2, C3 and C4 clearances available on request Products are supplied with standard CN radial internal clearance. Reduced C2 clearance, increased C3 clearance and greater C4 clearance are available. Components belonging to the C1 clearance group are not interchangeable.
Cages
Polyamide or solid brass Polyamide 6.6 cages (TVP) are suitable for most applications, while solid brass cages (M) are recommended for series 4 and for more demanding operating conditions.
Mounting
Mounting of cylindrical roller bearings
Cylindrical roller bearings feature a separable design: the ring with ribs, together with the roller and cage assembly, can be separated from the other ring, greatly simplifying mounting operations. During start-up at high temperatures, an additional radial load must be applied to the bearing.
Installation Mounting
- Installation methodsThanks to the separable design, the inner ring and the outer ring with roller and cage assembly can be mounted independently, greatly simplifying installation even where space is limited.
- Special RN/RNU designsFor applications with hardened and ground raceways directly on the shaft (RNU) or housing (RN), a larger shaft diameter can be used, providing increased strength and structural rigidity of the bearing arrangement.
Technical data
- Tolerances
- Normal (PN) as standard
- Load
- High radial load capacity
- Axial locating arrangement
- Configurable by design
- Speed
- Medium to high speeds · Single-row version
- Internal clearance
- CN internal clearance as standard; C2, C3 and C4 clearances available on request
- Cages
- Polyamide or solid brass
Applications
Applications
Components and application support for every industrial environment.
Industrial automation
Transmissions, mechanical presses and electric motors subjected to high radial loads and requiring continuous operational reliability. The different axial locating arrangements cover a wide range of mounting configurations.
Transmissions and axles
Gearboxes and transmission systems subjected to high radial loads at medium to high operating speeds. The single-row caged version with polyamide or solid brass cage provides high reliability and extended service life.
Automotive / Motorcycles, Trucks & Buses
Traction motors for railway vehicles and axial support applications. Special designs for traction motors and electrically insulated bearings address the most demanding requirements of the railway sector.
Construction Equipment
Pumps, compressors and systems operating under high radial loads and demanding conditions. The structural strength and availability of special designs ensure reliable performance even in the most severe applications.
Contacts
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Related products
Please also consider these alternatives: When radial loads are moderate and axial loads are also present, deep groove ball bearings provide a versatile solution with the capability to accommodate combined loads. When high radial loads are accompanied by misalignment between the housing and shaft, spherical roller bearings offer high load capacity while accommodating alignment errors. When a high axial load component is added to the radial load and exceeds the capability of cylindrical roller bearings, cylindrical roller thrust bearings provide the dedicated solution.
JFK Spherical roller bearings
Spherical roller bearings, also known as self-aligning roller bearings or barrel roller bearings, are double-row bearings with barrel-shaped rollers and a spherical raceway on…
JFK thrust roller bearings
Roller thrust bearings, also known as thrust roller bearings, are separable axial bearings featuring cylindrical rollers as rolling elements, designed to support high axial…