Bearing is an indispensable part of mechanical equipment. Its main function is to support the mechanical rotating body to reduce the friction coefficient of the mechanical load during the transmission of the equipment. What problems have you encountered during daily maintenance of rolling bearings? Jinrui listed several common problems and analyzed them one by one, hoping to help everyone.

1. Are there requirements for the rolling bearing installation surface and installation location? To

Yes. If there are iron filings, burrs, dust and other foreign objects in the bearing, it will cause noise and vibration when the bearing is running, and even damage the raceways and rolling elements. Therefore, before installing the bearing, you must ensure that the installation surface and the installation environment are clean. 

2. Must the rolling bearing be cleaned before installation?

The bearing surface is coated with anti-rust oil. You must carefully clean it with clean gasoline or kerosene, and then apply clean, high-quality or high-speed and high-temperature lubricating grease before installation. Cleanliness has a great influence on bearing life and vibration and noise. But what we want to remind you in particular is: fully enclosed bearings do not need to be cleaned and refueled.

3. How to choose grease?

Lubrication has an extremely important impact on the operation and life of bearings. Here is a brief introduction to the general principles of choosing lubricating grease. Grease is made of base oil, thickener and additives. The performance of different types and different grades of the same type and different grades of grease vary greatly, and the allowable rotation limit is different. Please pay attention when choosing. The performance of grease is mainly determined by the base oil. Generally, low-viscosity base oils are suitable for low temperature and high speed, and high-viscosity base oils are suitable for high temperature and high load. Thickeners are also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease.

4. Is the radial clearance of the rolling bearing as small as possible?

Not all bearings require the smallest working clearance, you must select the appropriate clearance according to the conditions. The basic radial clearance group is suitable for general operating conditions, normal temperature and common interference fit; bearings that work under special conditions such as high temperature, high speed, low noise, low friction, etc. should use large radial clearance; Bearings for precision spindles and machine tool spindles should have a smaller radial clearance; for roller bearings, a small amount of working clearance can be maintained.

In addition, there is no such thing as clearance for separate bearings; finally, the working clearance of the bearing after installation is smaller than the original clearance before installation, because the bearing has to bear a certain load rotation, and there is also the bearing coordination and load. The amount of elastic deformation.

5. What is the assembly process of rolling bearings?

Rolling bearing parts such as inner ring, outer ring, rolling element and cage, etc., after passing the inspection, enter the assembly workshop for assembly. The process is as follows: Demagnetization and cleaning of parts → inner and outer rolling channel size grouping selection → combination Cover → check clearance → riveting cage → final inspection → demagnetization, cleaning → rust prevention, packaging → finished product warehouse (packing, shipping).