Description of superfine cylindrical roller bearings

**Description of Ultra-Fine Cylindrical Roller Bearings** Home > Bearing Knowledge > Description of Ultra-Fine Cylindrical Roller Bearings *Source: China Bearing Network | Date: July 27, 2013* Ultra-fine cylindrical roller bearings are high-precision components developed by HRB Songbei Seiko. These bearings are available in the N10 and NN30 series, as well as selected products from the N19 and NNU49 series. The design allows for compensation of thermal expansion during rotation through the floating action between the rollers and raceways, making them suitable for use as floating bearings. These bearings are typically single-row designs and are widely used in applications that require: - High radial stiffness - Excellent axial load capacity - Precision performance In such applications, axial loads are often supported by two-way thrust angular contact ball bearings from the 2344 series. Cylindrical roller bearings feature tapered bores (with a taper of 1:12), which allow for precise adjustment of radial clearance. This makes it possible to control the amount of radial clearance or preload using axial displacement on tapered spindles. A new product from HRB is the hybrid ceramic roller bearing. Ceramic rollers significantly improve the bearing’s wear resistance and reduce friction. This leads to less lubricant consumption and lower operating temperatures, enabling higher rotational speeds and extending service life. Additionally, ceramic rollers enhance both static and dynamic rigidity. Due to their low coefficient of thermal expansion, the preload applied at higher temperatures is minimized. The inner and outer raceways, along with the roller surfaces, are manufactured to very high quality standards. This makes HRB cylindrical roller bearings particularly suitable for grease-lubricated applications. The presence of two ribs on the bearing ring requires careful attention during the greasing process. If oil lubrication is used, it should be noted that the oil requirements for this type of bearing are different compared to angular contact ball bearings. When installing these two types of bearings side by side, it is important to maintain separate lubrication circuits. Failure to do so may result in excessive oil accumulation, leading to increased bearing temperature. **Related Bearing Knowledge:** - Factors Affecting Bearing Life and How to Control Them - NSK Bearing Devices and Service Life Extension - TIMKEN Imported Bearings: Damage Diagnosis in Wind Turbine Generators - New Specification Analysis: Impact of Sensation and Temperature on INA Bearings This article is linked from http:// Please refer to China Bearing Network at http:// Previous: Listed Rolling Bearings – Common Issues Next: INA Import Bearings – Quality Inspection and Failure Causes (Word count: 586)

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