NJ224EM Heavy Duty Roller Bearing , Durable Industrial Machinery Bearings

NJ224EM Cylindrical Roller Bearing: Heavy-Duty, Stable & Durable For Industrial Machinery
I. Product Overview
The NJ224EM cylindrical roller bearing is an important supporting component in industrial transmission systems. With its excellent structural design and performance, it plays a key role in heavy machinery, large-scale equipment and other fields. As a typical model of single-row cylindrical roller bearings, it has an inner diameter of 120mm, an outer diameter of 215mm and a width of 58mm, achieving an excellent balance between load-carrying capacity and structural stability. It can be adapted to various equipment scenarios with strict requirements for large loads and high stability, providing a solid guarantee for the efficient operation of equipment.
II. Structural Design

1. Rolling Elements: High-precision cylindrical rollers are used as rolling elements. The rollers are made of high-quality high-carbon chromium bearing steel through multiple precision processing procedures, with extremely low surface roughness and dimensional accuracy controlled within the micrometer range. The cylindrical shape enables it to form line contact with the raceway. Compared with point-contact bearings, it has a larger contact area, which can disperse the load more evenly, significantly improve the radial load-carrying capacity of the bearing, and reduce local wear, prolonging the service life.

2. Raceways: The raceways of the inner and outer rings are processed by super-finishing grinding, with a surface hardness of up to HRC60-65, having excellent wear resistance and fatigue resistance. The geometric parameters of the raceway are accurately calculated to perfectly match the cylindrical rollers, ensuring that the rollers move smoothly during rolling, reducing the friction coefficient and vibration noise, and laying a foundation for the efficient operation of the bearing.

3. Cage: An integral metal machined cage is adopted, made of high-strength alloy steel, and its rigidity and toughness are enhanced through special heat treatment processes. The pocket size accuracy of the cage is extremely high, which can accurately guide and separate the cylindrical rollers, avoiding mutual collision and friction between the rollers, ensuring the orderly arrangement of the rollers during high-speed operation, and improving the overall stability and service life of the bearing.

4. Rib Structure: The outer ring of the bearing is designed with double ribs, and the inner ring has a single rib structure. This design endows the bearing with a certain axial load-carrying capacity, which can bear one-way axial force. At the same time, it can play an axial positioning role for the shaft or housing, limiting its displacement in a specific direction, so that the bearing can still maintain stable operation when bearing composite loads.

III. Performance Characteristics

1. Super Strong Radial Load-Carrying Capacity: Thanks to the line contact design between the cylindrical rollers and the raceway, the NJ224EM bearing has extremely strong radial load-carrying capacity. The basic rated dynamic load can reach a high value (specifically subject to actual parameters), which can easily cope with the huge radial force generated during the operation of heavy machinery and equipment, such as the main shaft support of large motors, rolling mills and other equipment.

2. Good Axial Load-Carrying Performance: Although it is mainly used to bear radial loads, with its unique rib structure, the bearing can bear a certain one-way axial load. In the working condition with axial force, it can provide reliable axial positioning for the equipment, ensuring the normal operation of the equipment in a complex stress environment.

3. High-Speed Rotation Stability: With precision processing technology and optimized structural design, the bearing can still maintain stable performance during high-speed operation. The low friction characteristics between the rollers and the raceway, as well as the precise guidance of the cage to the rollers, effectively reduce the heat generation and vibration during operation, enabling it to adapt to the working needs of higher rotating speeds, such as high-speed rotating machine tool spindles.

4. Excellent Fatigue Resistance: Using high-quality materials and advanced manufacturing processes, the bearing has excellent fatigue resistance. Under long-term full-load operation conditions, it can effectively resist failure caused by material fatigue, greatly extending the service life of the bearing and reducing the number of equipment maintenance and downtime.

IV. Application Fields

1. Heavy Machinery Manufacturing: Widely used in heavy machinery in metallurgy, mining and other industries, such as the work rolls of rolling mills and the main shafts of crushers. These equipment have harsh working environments and bear large loads. The super strong load-carrying capacity and stability of the NJ224EM bearing can meet their strict working requirements, ensuring the continuous and stable operation of the equipment.

2. Power Equipment: Suitable for rotor support of large generators, steam turbines and other power equipment. In these equipment, the bearing needs to bear huge radial loads and certain axial forces, and at the same time adapt to higher rotating speeds. The performance characteristics of the bearing can perfectly match its working needs, ensuring the safe and reliable operation of power equipment.

3. Machine Tool Industry: Often used for spindle and feed shaft support of heavy CNC machine tools. Machine tools have extremely high requirements for precision and stability during processing. The low vibration and high rigidity characteristics of the NJ224EM bearing can effectively ensure the machining accuracy and surface quality of the machine tool, improving processing efficiency.

4. Port Machinery: Plays an important role in port cranes, conveyors and other equipment. These equipment need frequent starting, braking and bearing impact loads. The high fatigue resistance and impact resistance of the bearing can cope with these complex working conditions, ensuring the efficient operation of port machinery.

V. Dimensions and Specification Parameters

VI. Maintenance Points

1. Lubrication Management: The lubrication condition of the bearing directly affects its service life and performance. Appropriate grease or lubricating oil should be selected according to the working temperature, rotating speed, load and other working conditions of the equipment. It is recommended to use high-temperature extreme pressure grease. Before installation, it is necessary to ensure that the inside of the bearing and the installation part are clean. The filling amount of grease should be 1/3-1/2 of the internal space of the bearing. Regularly check the lubrication state and replenish or replace the grease in time.

2. Regular Inspection: Establish a sound regular inspection system, and conduct regular visual inspection of the bearing to check for cracks, rust, wear and other abnormal conditions. At the same time, use vibration monitors, temperature sensors and other equipment to monitor the vibration value and temperature change of the bearing in real time. The normal working temperature should not exceed 40℃ of the ambient temperature. If any abnormality is found, stop the machine immediately for inspection and eliminate the fault.

3. Installation Specifications: When installing the bearing, ensure a clean installation environment to avoid dust and impurities entering the bearing. Use special installation tools, such as hydraulic jacks and sleeves, to avoid direct knocking on the outer or inner ring of the bearing to prevent deformation or damage of the bearing. During installation, it is necessary to ensure that the matching accuracy between the bearing and the shaft and bearing seat meets the design requirements, and the interference should be controlled within a reasonable range.

4. Storage Notes: For bearings that are not used temporarily, they should be stored in a dry, ventilated environment without corrosive gases, away from heat sources and humid areas. The bearings should be placed horizontally to avoid stacking and pressure. They can be wrapped with anti-rust paper or plastic film to prevent the bearings from rusting. During storage, the state of the bearings should be checked regularly to ensure that their performance is not affected.