Precautions for maintenance of rolling bearings

During the use of rolling bearings, due to their own quality and external conditions, their load-bearing capacity, rotational accuracy, and friction reduction performance will change. When the performance indicators of the bearings are lower than the usage requirements and cannot work normally, abnormal phenomena such as machine equipment stopping operation and functional damage will occur. If effective maintenance procedures are adopted in bearing assembly and disassembly, lubrication, pollution prevention, personnel training, online testing and timely troubleshooting, the above-mentioned faults can be avoided. When installing and disassembling bearings, attention should be paid to using appropriate tools and methods. Bearing installation is a strict maintenance task, and the quality of installation directly affects the accuracy, service life, and performance of bearings.

Therefore, it is necessary to use specialized bearing tools for installation and disassembly, which can simplify the installation process and avoid damaging the bearings and related shafts, bearing seats, and seals. The bearing installation tool must be suitable for all bearing specifications and models. For example, mechanical tools such as buffer rings are usually used, and small bearings can be installed by heating steel plates, ovens, or induction furnaces. Heating causes the inner ring of the bearing to expand and fit onto the shaft. As the bearing cools and the inner ring shrinks, a firm fit between the bearing and the shaft is achieved. This is one of the methods for bearing installation - heating fit, which is suitable for bearings with large interference.

Alternatively, a pressure fit can be used, which involves using a cylindrical sleeve to push against the collar and applying force to the collar with interference fit. For the installation of tapered hole bearings, locking nuts or heating installation methods are generally used. For the installation of thrust bearings, the shaft rotation is mostly the case, and the inner ring and shaft are in an interference fit, while the outer ring and bearing seat are in a clearance fit. Therefore, the central shaft ring of the bidirectional thrust bearing should be fixed on the shaft to prevent rotation relative to the shaft. In addition, disassembly tools such as bearing pullers can effectively prevent damage to parts near the bearings. During installation and disassembly, do not use a hammer to directly strike the bearing collar.