Single Row Short Cylindrical Roller Bearing

Single row short cylindrical roller bearings are usually separable, which means that their inner ring, outer ring and roller-retainer assembly can be separated, facilitating installation, disassembly and maintenance. The contact between the rollers and the raceways is linear, which enables them to have much higher radial load-bearing capacity than ball bearings of the same size (about 1.5-3 times that of deep groove ball bearings), with good rigidity and shock resistance. In addition, they have a low friction coefficient and are suitable for high-speed rotation, with the maximum rotational speed approaching that of deep groove ball bearings.

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Product Introduction

Product Introduction: Single-row Short Round Roller Bearing
1. Product Overview
Single row short cylindrical roller bearings are a classic type of radial rolling bearings. Their core design features cylindrical rollers as the rolling elements, and their structure is typically separable into an inner ring and an outer ring. This design makes them particularly suitable for applications involving heavy radial loads and high speeds, making them a key fundamental component in industrial machinery.
2. Product Structure and Key Features
Structure:
·Outer ring: Usually has two ribs or no ribs.
·Inner ring: Usually has one or two ribs or no ribs.
·Cylindrical roller: Provides contact with the raceway along a line.
·Sleeve: Separates and guides the rollers made of steel, brass or engineering polymer.
Main features:
·High radial load capacity: The line contact between the rollers and the raceways makes its radial load capacity significantly higher than that of deep groove ball bearings of the same size.
·High-speed capability: The optimized design and precise cage enable low friction, making it suitable for high-speed operation.
·Separable design: The inner ring, outer ring, and roller cage components can be installed separately. This feature greatly simplifies installation, disassembly, and maintenance.
·High rigidity: Low deformation under load, ensuring high operational accuracy of the main machine.
3. Main Types and Configurations
The types are distinguished by their rib configurations, which determine their ability to handle axial displacements and thus meet various mechanical requirements:

Type	Structural Feature	Primary Function & Application
NU Type	Two ribs on the outer ring, no ribs on the inner ring	Permits free bidirectional axial displacement of the shaft. Primarily used as a free-end bearing to accommodate shaft expansion from heat.
NJ Type	Two ribs on the outer ring, one rib on the inner ring	Can support unidirectional axial loads. Used for unidirectional axial locating of the shaft.
NUP Type	Adds a loose locating ring to the NJ design	Can restrict bidirectional axial displacement of the shaft. Used as a fixed-end bearing for precise axial positioning.
N Type	Two ribs on the inner ring, no ribs on the outer ring	Functionally similar to NU type, allowing housing displacement.
NF Type	Two ribs on the inner ring, one rib on the outer ring	Functionally similar to NJ type, used for unidirectional locating of the housing.

4. Typical Applications

This bearing series is the ideal choice for:

· Electric Motors & Generators: Shaft extensions and non-drive ends of medium and large AC/DC motors.
· Machine Tools: Spindle systems of lathes, milling machines, and grinders requiring high precision and rigidity.
· Transportation: Railway axle boxes, automotive gearboxes, and rear axles.
· Heavy Machinery: Steel rolling mills, mining machinery, vibrating screens, and lifting equipment.
· Wind Power & Gearboxes: Main shafts and gearboxes in wind turbines.

5. Selection & Usage Guidelines

· Selection Basis: Choose the correct type based on radial load, rotational speed, and the required axial guidance of the shaft (fixed or free end).
· Precision Classes: Available from normal (P0) to ultra-precision (P2) classes to meet varying demands for running accuracy and speed.
· Clearance Selection: Select the appropriate radial internal clearance (C2, CN, C3, C4, C5) based on fits, operating temperature, and load conditions.
· Important Note: These bearings require high machining accuracy of the shaft and housing (roundness, squareness). Precise alignment during installation is critical; even slight misalignment can cause stress concentration and significantly reduce bearing service life.

In summary, Single-Row Short Cylindrical Roller Bearings, with their superior radial load capacity, high-speed performance, and flexible axial guidance solutions, are a key technology for supporting heavy-duty, high-speed, and precision industrial drive systems.

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