Single Row Full Complement Cylindrical Roller Bearing

Single-row full-complement cylindrical roller bearings are specialized rolling bearings designed for extreme radial heavy-load and low-speed stable operation scenarios. Through the structural innovation of eliminating traditional cages and maximizing the filling of cylindrical rollers, their radial load-bearing capacity is increased to 1.5-2 times that of ordinary single-row caged cylindrical roller bearings of the same size. They have become core supporting components in industries such as metallurgy, mining, and heavy machinery, capable of "withstanding extreme radial loads and ensuring low failure rate operation of equipment", accurately filling the performance gap of ordinary bearings in extreme heavy-load scenarios.​

I. Product Structure: Heavy-Load Gene of Full-Complement Design​

The core advantages of single-row full-complement cylindrical roller bearings stem from their "cage-free + full-complement roller" structural design, with each component optimized specifically around the goal of "enhancing load-bearing capacity":​

(I) Core Component Design​

Inner and Outer Rings: Made of high-purity bearing steel (100Cr6, SUJ2) or high-strength carburized steel (20CrNiMo), processed through integral forging and super-finishing grinding processes. The surface roughness of the raceways is controlled within Ra ≤ 0.2μm, and the geometric accuracy reaches Grade P6 or above. The inner ring is mostly designed with a double-rib structure, while the outer ring is classified into rib-free (Type N), single-rib (Type NJ), or double-rib (Type NN) based on application requirements. The double-rib structure can effectively limit the axial movement of rollers, making it suitable for scenarios with higher requirements for operational stability. Some heavy-load models adopt a "thickened raceway wall" design for inner and outer rings, where the raceway wall thickness is 30%-50% thicker than that of ordinary single-row bearings, further enhancing structural strength and preventing raceway deformation under heavy loads.​

Cylindrical Rollers: Adopt a "large-diameter + crowned modification" design. The roller diameter is 15%-25% larger than that of ordinary single-row caged bearings, and the quantity is increased by 40%-60% (e.g., for a bearing with an inner diameter of 100mm, the full-complement model can have 20-25 rollers, while the ordinary caged model only has 12-15 rollers). The roller surfaces undergo super-finishing grinding and polishing, with a hardness of HRC 60-64 and impact toughness of ≥ 10J/cm². This design can effectively disperse radial loads, reduce the stress on individual rollers, and the crowned modification minimizes edge contact stress on the raceways, avoiding early failure caused by local overload.​

Cage-Free Structure: The traditional cage is eliminated, and rollers are directly fully filled between the raceways of the inner and outer rings, achieving stable operation through mutual limiting of the rollers. This design not only maximizes the use of internal bearing space to improve load-bearing capacity but also reduces frictional wear between the cage and rollers, lowering temperature rise during low-speed operation. Additionally, it avoids the risk of cage breakage under heavy loads, enhancing the overall reliability of the bearing.​

(II) Sealing and Lubrication Adaptation​

Sealing Structure: For harsh working conditions with high levels of dust and impurities, "double-lip seals" or "labyrinth seals" can be configured. Double-lip seals are made of nitrile rubber or fluororubber, with lips closely fitting the inner ring ribs, achieving an IP65 protection rating to effectively block dust and cooling fluid. Labyrinth seals form a barrier through tortuous channels between the inner and outer rings, suitable for high-temperature and high-dust scenarios (such as metallurgical rolling mills), further improving the bearing's dust-proof capability.​

Lubrication Design: Without the obstruction of a cage, lubricating oil can come into direct contact with rollers and raceways, supporting both grease lubrication and oil bath lubrication. For grease lubrication, extreme-pressure lithium-based grease (operating temperature: -20℃-120℃) is used, which can meet the operational needs for 1000-2000 hours with a single application. Oil bath lubrication is suitable for heavy-load equipment operating continuously, removing heat through the circulation of lubricating oil and controlling the bearing temperature rise within 60℃ to ensure long-term stable operation.​

II. Product Performance: Core Advantages in Extreme Heavy-Load Scenarios​

The performance advantages of single-row full-complement cylindrical roller bearings focus on "radial heavy-load bearing" and "low-speed stability", specifically manifested as follows:​

Superior Radial Load-Bearing Capacity: The basic dynamic load rating is 50%-80% higher than that of ordinary single-row caged cylindrical roller bearings of the same size, and the basic static load rating is 60%-90% higher. Taking a bearing with an inner diameter of 150mm and outer diameter of 225mm as an example, the full-complement model (e.g., SL182930) has a basic dynamic load rating of 800-900kN, while the ordinary caged model (e.g., NU230) only has 450-550kN. It can easily bear radial loads of hundreds of kilonewtons, making it suitable for extreme heavy-load equipment such as mining crushers and crane drums.​

Low-Speed and High-Rigidity Operation: Due to the large number of rollers and large contact area, the radial rigidity of the bearing is 40%-60% higher than that of ordinary single-row bearings, with radial deformation ≤ 0.01mm. This effectively controls the radial runout of the shaft, making it suitable for low-speed equipment requiring high operational accuracy (such as machine tool index plates and heavy-duty reducers). Meanwhile, during low-speed operation (rotational speed ≤ 1500r/min), the cage-free structure reduces frictional wear, resulting in a temperature rise 10-15℃ lower than that of ordinary caged bearings and an operating noise ≤ 70dB, improving the operational stability of the equipment.​

Impact Resistance and Long Service Life: The crowned modification design of the rollers and high-strength materials enable the bearing to withstand short-term overload impacts of 20%-30% (such as equipment startup impacts and material loading impacts), avoiding roller breakage or raceway spalling. Under normal maintenance and proper lubrication, the service life can reach 15,000-20,000 hours, 30%-50% longer than that of ordinary single-row caged bearings, reducing the frequency of equipment shutdowns for maintenance.​

III. Product Model Classification: Adapting to Different Working Conditions​

Based on the outer ring rib structure and application scenarios, single-row full-complement cylindrical roller bearings are mainly classified into the following mainstream model series, each with clear functions and applicable scenarios:

IV. Application Fields: Value Implementation in Extreme Heavy-Load Scenarios​

With the performance advantages of "extreme radial heavy-load + low-speed stability", single-row full-complement cylindrical roller bearings are widely used in low-speed equipment requiring high load-bearing capacity:​

Metallurgical Industry: Used as work roll bearings for small rolling mills and drum bearings for metallurgical cranes, they bear radial loads from rolling forces and heavy object hoisting (up to 500-800kN) and are suitable for low-speed operation (rotational speed ≤ 800r/min), ensuring rolling mill accuracy and safe crane operation. Some models are equipped with high-temperature seals and lubrication, capable of withstanding operating temperatures of 150-200℃, making them suitable for hot processing equipment.​

Mining Machinery Industry: Applied as main shaft bearings for jaw crushers and drum bearings for mining conveyors, they bear impact from ore crushing (single impact load ≤ 300kN) and heavy conveying loads. The cage-free structure avoids wear and breakage of the cage in dusty environments, extending maintenance intervals and ensuring 24/7 continuous operation of mining equipment.​

Heavy Construction Machinery Industry: Used as bearings for crane luffing mechanisms and slewing support bearings for excavators, they bear radial loads generated by heavy object hoisting and slewing. The high rigidity during low-speed operation ensures equipment operation accuracy, avoiding operational deviations caused by bearing deformation.​

Machine Tool and General Machinery Industry: Adapted as index plate bearings for large machine tools and drive shaft bearings for heavy-duty gearboxes, they provide high-rigidity support during low-speed operation (rotational speed ≤ 1200r/min), controlling the radial runout of the shaft within 0.005mm and improving machine tool machining accuracy and gearbox transmission efficiency.

V. Core Product Advantages
Structural Design Advantage: The design without retaining rings significantly reduces the manufacturing and assembly costs of retaining rings, and also eliminates the wear and breakage risks of retaining rings under heavy loads and dusty conditions, thereby lowering the probability of bearing failure. The full-load arrangement of rollers maximizes the utilization of the internal space of the bearing, achieving a significant increase in bearing capacity compared to ordinary bearings with retaining rings, without the need to increase the bearing volume to meet heavy-load requirements, thus saving installation space for equipment.
Adaptability to Working Conditions: A variety of sealing structures are available for selection, ranging from basic dust-proof double lip seals to high-temperature and anti-contamination labyrinth seals, which can adapt to different harsh environments such as metallurgical high-temperature, mining dusty conditions, and construction machinery dampness. This reduces the erosion of external impurities on the bearing interior. The lubrication method is flexible, with grease lubrication suitable for intermittent operation equipment, and oil bath lubrication meeting the requirements of continuous heavy-load operations. The absence of retaining rings allows for more uniform lubrication, further enhancing the bearing's adaptability to complex working conditions.
Low Comprehensive Operating Costs: The extremely long service life (30%-50% longer than ordinary single-row bearings) reduces the frequency of bearing replacements, lowers the cost of spare parts procurement; the long maintenance interval (grease lubrication can be replenished once every 1,000-2,000 hours), reduces equipment downtime for maintenance, and improves production efficiency; high-strength materials and optimized structural design reduce the probability of fault repairs, reduce the risk of equipment damage due to bearing failure, and indirectly lower the operating costs of the enterprise.
High Operating Safety: High radial stiffness and low radial deformation (≤0.01mm) ensure the stability of the shaft during equipment operation, avoiding equipment vibration and displacement caused by insufficient bearing rigidity, and reducing production safety hazards; the curvature modification of rollers and high-strength characteristics enable them to withstand short-term overload impacts, making them less prone to roller fragmentation or raceway peeling in sudden load scenarios such as equipment startup and material loading, ensuring the safety and stability of the production process.

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