Kesle NJ203 Bearing High Load 17x40x12 Roller Bearing Single Row

NJ203 Cylindrical Roller Bearing 17x40x12mm - High Load, Industrial/Textile Use

I. Product Overview

The NJ203 is a single-row cylindrical roller bearing, playing a key role in various industrial fields with its unique design and reliable performance. It is designed to efficiently handle complex mechanical operating conditions, meeting the stringent requirements of various equipment for high precision, high load capacity, and long service life.

II. Structural Design

1. Inner and Outer Ring Structure:
   • The outer ring features integral ribs on both sides, which significantly enhance the stability of the bearing during operation, effectively preventing axial 窜动 of the rollers and ensuring smooth operation when the bearing is subjected to radial loads.
   • The inner ring is equipped with a rib on one side, allowing the shaft to produce a certain axial displacement in one direction. This is particularly important in applications where thermal expansion or minor displacements between mechanical components exist, providing necessary compensation for the normal operation of the equipment.
2. Rollers and Cage:
   • Adopts cylindrical roller design, with the number and size of rollers carefully optimized to achieve optimal load capacity and operational stability. Under high loads, the rollers can evenly distribute pressure, reducing local stress concentration and significantly extending the bearing's service life.
   • The cage is made of high-quality materials, whose role is to accurately guide the movement trajectory of the rollers, preventing collision and friction between them, and ensuring that the rollers can maintain good synergy even at high speeds. For example, in high-speed motors, the stable guiding function of the cage can effectively reduce vibration and noise, improving the stability and efficiency of motor operation.

III. Key Technical Parameters

IV. Performance Advantages

1. High Radial Load Capacity:
   Compared with other types of bearings of the same size, the NJ203 can withstand larger radial loads. This feature makes it widely used in key parts of heavy-duty equipment. For example, in crushers of mining machinery, the NJ203 bearing used in the shaft support of the crushing roller can stably bear the huge radial impact force generated during crushing, ensuring continuous and efficient operation of the equipment.
2. High-Speed Stability:
   Advanced structural design and high-precision manufacturing processes enable the NJ203 to maintain excellent stability at high speeds. Its low vibration and low noise characteristics perform excellently in equipment with high requirements for speed and precision. Taking the spindle of precision machine tools as an example, the NJ203 bearing can ensure the positioning accuracy of the spindle under high-speed rotation, thereby ensuring the high precision and surface quality of machined parts.
3. Long Service Life:
   High-quality materials, fine processing technology, and reasonable internal structural design collectively contribute to the long service life of the NJ203 bearing. Under normal use and maintenance conditions, it can work stably for a long time, reducing the number of equipment shutdowns for maintenance and lowering the operating costs of enterprises. For example, in continuously operating automated production line equipment, the long-life characteristic of the NJ203 bearing can ensure the long-term stable operation of the production line and improve production efficiency.
4. Advantages of Separable Design:
   The separable inner ring design brings great convenience to installation and maintenance. During equipment installation, the outer ring can be installed in the bearing housing first, and then the inner ring and shaft components can be installed, simplifying the installation process and improving installation efficiency. During equipment maintenance, there is no need to disassemble the entire shaft system; only the inner ring needs to be separated to inspect, replace, or repair the bearing, greatly shortening maintenance time and improving the maintainability of the equipment.

V. Application Fields

1. Industrial Machinery:
   Widely used in the transmission systems of various industrial machinery, such as the input and output shafts of reducers and the drive rollers of conveyor belts. The NJ203 bearing ensures the stable operation of machinery with its high load capacity and stable performance, realizing efficient power transmission and material conveying.
2. Mining Equipment:
   Suitable for small hoists, crushers, etc., in mining construction equipment. In these devices, it can withstand high loads and impact loads under harsh working conditions, ensuring reliable operation of the equipment in complex mining environments and providing guarantee for the continuity of mining operations.
3. Textile Machinery:
   Plays an important role in high-speed rotating components such as rollers and spindles of textile machinery. Its high-speed stability and low noise characteristics can meet the requirements of textile processes for high precision and low vibration, ensuring the quality and production efficiency of textiles.
4. Electronic Equipment Manufacturing:
   In some precision processing equipment during electronic equipment manufacturing, such as small drilling machines and placement machines, the high precision and long life of the NJ203 bearing can ensure the processing accuracy and stability of the equipment, meeting the requirements of electronic component manufacturing for high-precision equipment.

VI. Installation and Maintenance Points

1. Installation Points:
   Ensure the fitting accuracy of the shaft and bearing housing. It is recommended to select m6 for the shaft tolerance and J7 for the bearing housing hole tolerance to ensure a good interference fit and prevent the bearing from loosening during operation. When using the hot fitting method, the heating temperature should be controlled between 80℃ - 120℃ to avoid performance degradation of the bearing material due to excessive temperature. After installation, use professional tools to detect the radial and axial clearance of the bearing to ensure they are within the specified range, ensuring normal operation of the bearing.
2. Lubrication Points:
   Select appropriate lubricants according to different application scenarios and working conditions. Under general working conditions, NLGI 2 lithium-based grease can be used, which has good lubricating performance and water resistance. When filling grease for the first time, the filling amount should be 1/3 - 1/2 of the internal space of the bearing. Under high temperature, high speed, or heavy load conditions, it is recommended to use synthetic lubricating oil and equip a complete lubrication system. Regularly check the oil quality and quantity of the lubricating oil, and timely replenish and replace it to ensure sufficient and effective lubrication of the bearing.
3. Maintenance Points:
   Regularly monitor the operating status of the bearing through vibration analysis, temperature detection, etc., to timely detect potential early faults of the bearing. It is generally recommended to perform vibration detection once a week and temperature monitoring once a month. If abnormal increase in bearing vibration or excessive temperature is found, stop the machine immediately for inspection, analyze the cause, and take corresponding maintenance measures. At the same time, keep the equipment operating environment clean to prevent dust, impurities, etc., from entering the bearing, affecting its normal service life.

VII. Technical Alternative Solutions

1. Low-Cost Alternative:
   For applications sensitive to cost and with relatively low working condition requirements, the NJ203E model with a stamped steel cage can be considered. This model reduces costs by approximately 15% - 20% compared to the NJ203EM while maintaining basic performance, but its high-speed performance and load capacity are slightly reduced. It is suitable for occasions with low requirements for speed and load, such as motor shaft supports of some small ventilation equipment.
2. Special Working Condition Alternatives:
   In high-temperature environments (e.g., temperature exceeding 120℃), the NJ203HT model with a special high-temperature material cage can be selected, which can operate stably in high-temperature environments to ensure normal operation of the equipment. In environments with corrosion resistance requirements, such as food processing and chemical industries, the stainless steel NJ203SS model can be used, which has good corrosion resistance, can effectively prevent bearing damage due to corrosion, and extend the service life of the equipment.