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Use and fit of bearings

 

The use of bearings

　　Precautions for use

　　

Rolling bearings make precision parts, so in the use of the requirements to be cautious accordingly, both the use of high-performance bearings, if the use of improper, can not achieve the expected performance effect, therefore, the use of bearings should pay attention to the following:

　

　Keep the bearing and its surroundings clean. Even smiling dust that is invisible to the naked eye can get into the bearing, it can increase bearing wear, vibration and noise.

It should be used carefully and carefully when installing, and it is not allowed to punch strongly, it is not allowed to hit the bearing directly with a hammer, and it is not allowed to transmit pressure through the rolling elements.

Use appropriate and accurate installation tools, use specialized tools as much as possible, and try to avoid things like cloth and staple fibers.

To prevent corrosion of bearings, when taking bearings directly by hand, wash off the sweat on your hands and apply high-quality mineral oil before operating, especially in the rainy season and summer.

　　Bearing fit

　Choice of fit

The inner and outer diameter dimensions of rolling bearings are manufactured according to standard tolerances, and the tightness of the inner ring of the bearing and the shaft, and the outer ring and the housing bore can only be achieved by controlling the tolerances of the journal and the tolerances of the housing bore. The matching of the inner ring of the bearing and the shaft adopts the base hole system, and the matching of the outer ring of the bearing and the housing hole adopts the machine shaft system.

To select the correct fit, it is necessary to know the actual load conditions, operating temperature and other requirements of the bearing, which is actually very difficult. Therefore, in most cases, the choice of fit is based on the use of fine research.

The size of the load

The winnings between the ferrule and the shaft or housing depend on the size of the load, with heavier loads using larger winnings and lighter loads using smaller wins.