Bearing fit

　　1、 Matching selection

　　The inner diameter and outer diameter of rolling bearings are manufactured according to standard tolerances. The fit tightness of bearing inner ring and shaft, outer ring and seat hole can only be realized by controlling the tolerance of journal and seat hole. The matching between the bearing inner ring and the shaft adopts the base hole system, and the matching between the bearing outer ring and the seat hole adopts the base shaft system.

　　To correctly select the fit, we must know the actual load conditions, working temperature and other requirements of the bearing, which is actually very difficult. Therefore, in most cases, the matching is selected according to the use of fine grinding.

　　2、 Load size

　　The win-win amount between the ferrule and the shaft or shell depends on the load. The heavier load adopts the larger win-win amount, and the lighter load adopts the smaller win-win amount

　　Precautions for use

　　Rolling bearing is a precision part, so it is required to be cautious in use. Even if high-performance bearing is used, if it is not used properly, it can not achieve the expected performance effect. Therefore, pay attention to the following matters when using bearings:

　　1、 Keep the bearings and their surroundings clean. Even if very small dust enters the bearing, it will aggravate the wear, vibration and noise of the bearing.

　　2、 The installation shall be careful. It is not allowed to press strongly, directly knock the bearing, and transfer pressure through the rolling element.

　　3、 Use correct installation tools, use special tools as much as possible, and try to avoid using cloth and short fiber.

　　4、 To prevent the bearing from corrosion and rust,  do not hold the bearing directly by hand. Apply high-quality mineral oil before operation. Pay special attention to rust prevention in rainy season and summer.