Single-row Cylindrical Roller Bearing

Single row cylindrical roller bearings are compact rolling bearings, consisting of an inner ring, an outer ring, cylindrical rollers and a cage. Their core feature is that they achieve stronger radial load capacity through the line contact between the cylindrical rollers and the raceways of the inner and outer rings. The classification of their types is mainly based on the edge structure. Common models include NU, N, NJ, NUP, etc. The edge designs of different models correspond to different axial displacement requirements: the N type outer ring has no edge, the inner ring has double edges, allowing the shaft to have bidirectional axial displacement relative to the bearing seat, and is commonly used as non-fixed-end bearings; the NU type has double edges on the outer ring and no edge on the inner ring; the NJ type has double edges on the outer ring and a single edge on the inner ring, suitable for one-way axial positioning of the shaft; the NUP type has double edges on the outer ring and a single edge on the inner ring, and adds a detachable flat edge ring on the basis of the NUP type, which can be used as a positioning end bearing to achieve bidirectional axial positioning of the shaft.

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Product Introduction

As a core supporting component in the industrial transmission field, single-row cylindrical roller bearings, with their precise structural design and excellent load-bearing performance, have become the preferred solution for addressing the challenges of heavy radial loads and high-speed operation. Through optimized mechanical structures and material technologies, they play an irreplaceable supporting role in various precision machinery and heavy-duty equipment.

I. Core Structure and Design Features

The bearing adopts a modular and separable design, mainly composed of an inner ring, outer ring, cylindrical rollers, and a cage. Each component features high interchangeability, which greatly simplifies the installation, disassembly, and maintenance processes. The rollers and raceways use a line contact or modified line contact structure, combined with a logarithmic curve profile design, effectively reducing contact edge stress and adapting to a certain degree of misalignment errors and shaft deflection. Cages are made of various materials such as stamped steel plates, machined copper alloys, or molded polyamides, which can prevent mutual contact and friction between rollers while optimizing the internal lubrication environment. Some high-end models adopt the X-life quality standard; by improving the geometric accuracy of raceways and reducing surface roughness (Ra value), they achieve a dual enhancement in load-bearing capacity and service life.

II. Key Performance Advantages

Superior Radial Load-Bearing Capacity: Compared with deep groove ball bearings of the same size, the radial load-bearing capacity is increased by 1.5 to 3 times. Benefiting from the large-area contact characteristics between cylindrical rollers and raceways, they can easily handle heavy loads and impact loads. Models with a full-complement roller design can withstand extremely heavy radial loads, and their radial rigidity is significantly enhanced.

High-Speed Stable Operation Performance: The low-friction structural design of rolling elements and ribs, combined with optimized lubricating oil film formation conditions, enables their limiting speed to be close to that of deep groove ball bearings. They can still maintain low temperature rise and high stability during high-speed operation.

Flexible Axial Adaptability: Depending on the differences in rib configuration, axial displacement compensation or positioning functions can be achieved. For example, Type N (outer ring without ribs, inner ring with double ribs) and Type NU (outer ring with double ribs, inner ring without ribs) bearings allow bidirectional axial displacement between the shaft and the bearing housing, adapting to the thermal expansion requirements during equipment operation.

Long-Term Reliable Operation Guarantee: The sealed design can achieve dustproof, waterproof, and lubricant retention effects, further reducing friction losses; split-type models are specially designed for hard-to-maintain parts such as crankshafts, which can reduce equipment downtime for maintenance and costs.

III. Mainstream Models and Functional Classification

Based on the differences in the rib structures of inner and outer rings, mainstream models can meet the needs of various working conditions:

Non-Locating Bearings (Floating End): Type N (outer ring without ribs, inner ring with double ribs) and Type NU (outer ring with double ribs, inner ring without ribs) allow bidirectional axial displacement, adapting to the scenario of shaft thermal elongation.

Single-Directional Locating Bearings: Type NJ (outer ring with double ribs, inner ring with single rib) and Type NF (outer ring with single rib, inner ring with double ribs) can bear a small amount of unidirectional axial load and realize single-directional positioning of the shaft.

Bidirectional Locating Bearings: Type NUP (outer ring with double ribs, inner ring with single rib + separable flat rib) and Type NH (combination of Type NJ + HJ inclined rib) can limit the bidirectional axial displacement of the shaft and have better installation adaptability.

Special Function Models: Including dustproof and waterproof models with sealed structures, extreme heavy-load models with full-complement rollers, and convenient positioning models with retaining grooves.

IV. Application Fields and Scenario Value

With multi-dimensional performance advantages, the bearings are widely used in the following core fields:

Industrial Transmission Equipment: Motor spindles, reducers, and gearboxes bear the radial force generated by gear meshing, ensuring transmission efficiency and precision.

Precision Machine Tools: The high-rigidity design adapts to the needs of machine tool spindles, maintaining machining accuracy during high-speed cutting. Some high-precision models adopt a 1:12 tapered bore for easy clearance adjustment.

Heavy-Duty Machinery and Equipment: Rotating components of rolling mills, mining machinery, and cranes resist heavy-load impacts and harsh working conditions.

Transportation Field: Axle supports of railway passenger carriages, automobile gearboxes, and diesel engine crankshafts balance load-bearing requirements and operational stability.

New Energy Equipment: Gearboxes of wind turbines adapt to speed fluctuations and heavy-load working conditions, and X-life models can extend the maintenance interval.

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