Design and Application System of Cylindrical Roller Bearings

Cylindrical roller bearings are designed to withstand large radial loads. These bearings are made of single, double or multi-row rolling elements to meet the radial load requirements of the application. It has many standard series and configurations and is widely used in multiple industries. The combination of high load capacity, medium speed rating and industrial interchangeability makes it one of the most popular bearing designs.  The products of bearing rollers adopt ISO series metric, ABMA series metric and inch, journal type, full compensation series, multi-row series and group mill size. These bearings are dimensionally interchangeable with bearings of the same number and size in the industry. Journal bearings and other standard series components are interchangeable with components from other manufacturers.   For a given I.D.O.D., multiple configurations with the same load capacity allow many mounting arrangements and widths. Our cylindrical roller bearings can be manufactured in sizes from 3' ID to 84' OD. When encountering special applications, internal radial clearance and cage designs can be tailored to your specific application. Precautions for installation and disassembly of full complement cylindrical roller bearings: Full complement cylindrical roller bearings must be cleaned before installation: the bearing surface is coated with anti-rust oil, which must be carefully cleaned with clean gasoline or kerosene, and then coated with clean high-quality or high-speed high-temperature oil. Lubricating grease can only be installed and used. The impact of cleanliness on the life of rolling bearings and vibration and noise is very large, but we would like to remind you that fully enclosed bearings do not need to be cleaned and refueled. Attention points during installation and disassembly: Do not directly hammer the bearing end face and non-stressed surface during installation. Use pressure blocks, sleeves or other installation tools (tools) to make the bearing evenly stressed, and do not install through rolling elements. . If the mounting surface is lubricated, the installation will be smoother. If the interference is large, the bearing should be heated to 80~90℃ in mineral oil and installed as soon as possible, and the oil temperature should be strictly controlled not to exceed 100℃ to prevent the tempering effect from reducing the hardness and affecting the size recovery. When it is difficult to disassemble, it is recommended that you use the disassembly tool to pull out and pour hot oil on the inner ring carefully. The heat will expand the inner ring of the rolling bearing, making it easier to fall off.  There are certain requirements for the installation surface and installation site: if foreign objects such as iron filings, burrs, dust, etc. enter the bearing, it will cause noise and vibration during the operation of the bearing, and even damage the raceway and rolling elements. Therefore, before installing the bearing, it is necessary to ensure that the installation surface and installation environment are clean. How to ensure the service life of the bearing rollers: In order to ensure the long life of the bearing rollers, the oil lubrication method is more reliable than the grease lubrication method. As long as the oil is properly selected, well filtered, and the oil supply is appropriate, it is regularly inspected and replaced in time. , the point is to ensure that the film roughness ratio λ is greater than 1 and as close as possible to 4, the target can be achieved. Grease lubrication generally has the phenomenon of uneven oil film and lean oil. The lubricating performance is less stable than that of oil. At the same time, the life of the grease itself must be long, and the life of general grease is much lower than the fatigue life of rolling tapered bearing rollers in most cases. . Some foreign long-life greases, as long as a thin layer evenly adheres to the rolling surface of SKF tapered roller bearings, can work in parts such as boring machine spindles for more than 10 years and maintain excellent lubricating performance. It is also being developed domestically.  In the occasions that are not suitable for oil lubrication, it is advisable to use good quality grease, and select the appropriate amount of grease and grease replacement cycle. Due to the large dispersion of grease life, the grease replacement cycle should be determined after careful monitoring and long-term accumulation of practical experience. Under better environmental conditions, with suitable seals, high-quality grease can also maintain lubrication for a long time. As long as the life of the tapered bearing rollers is not too long, it is possible to fill grease once and then do not need to add grease, but Caution should be exercised in this situation. The seal can prevent the loss of lubricant and the entry of dirt into the tapered bearing roller, so as to maintain the lubrication and cleanliness of the tapered bearing roller and help to achieve a long life, but the simplicity of the sealing structure, the cost, and the effectiveness of the seal must also be considered. And the validity period, according to the environmental conditions and the required life of the SKF tapered roller bearing, it should be reasonably selected. At the same time, it should be noted that the proper use of the seals can bring great benefits; the improper use of the seals will have little effect. For example, the seal of the contact seal heats up at high speed and wears quickly and loses the sealing effect, and the wear products contaminate the SKF tapered roller bearing; when the non-contact seal has a pressure difference (air pressure or oil pressure) on both sides of the seal , the dust-proof or oil-sealing effect will be poor.

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